Remove dependency errors (#507)

vendor/manifest

@@ -298,12 +298,6 @@
 			"revision": "6a22caf2fd45d5e2119bfc3717e984f15a7eb7ee",
 			"branch": "master"
 		},
-		{
-			"importpath": "github.com/tj/go-debug",
-			"repository": "https://github.com/tj/go-debug",
-			"revision": "ff4a55a20a86994118644bbddc6a216da193cc13",
-			"branch": "master"
-		},
 		{
 			"importpath": "github.com/uber-go/atomic",
 			"repository": "https://github.com/uber-go/atomic",
@@ -311,14 +305,14 @@
 			"branch": "master"
 		},
 		{
-			"importpath": "github.com/uber/jaeger-client-go",
-			"repository": "https://github.com/uber/jaeger-client-go",
+			"importpath": "github.com/jaegertracing/jaeger-client-go",
+			"repository": "https://github.com/jaegertracing/jaeger-client-go",
 			"revision": "3ad49a1d839b517923a6fdac36d81cbf7b744f37",
 			"branch": "master"
 		},
 		{
-			"importpath": "github.com/uber/jaeger-lib/metrics",
-			"repository": "https://github.com/uber/jaeger-lib",
+			"importpath": "github.com/jaegertracing/jaeger-lib/metrics",
+			"repository": "https://github.com/jaegertracing/jaeger-lib",
 			"revision": "21a3da6d66fe0e278072676fdc84cd4c9ccb9b67",
 			"branch": "master",
 			"path": "/metrics"
@@ -458,7 +452,7 @@
 		{
 			"importpath": "gopkg.in/h2non/bimg.v1",
 			"repository": "https://gopkg.in/h2non/bimg.v1",
-			"revision": "45f8993550e71ee7b8001d40c681c6c9fa822357",
+			"revision": "02e621739c77c791d8c153f240b7a1f75b07816f",
 			"branch": "master"
 		},
 		{

vendor/src/github.com/jaegertracing/jaeger-client-go/CHANGELOG.md

@@ -0,0 +1,131 @@
+Changes by Version
+==================
+
+2.9.1 (unreleased)
+------------------
+
+- nothing yet
+
+
+2.9.0 (2017-07-29)
+------------------
+
+- Pin thrift <= 0.10 (#179)
+- Introduce a parallel interface ContribObserver (#159)
+
+
+2.8.0 (2017-07-05)
+------------------
+
+- Drop `jaeger.` prefix from `jaeger.hostname` process-level tag
+- Add options to set tracer tags
+
+
+2.7.0 (2017-06-21)
+------------------
+
+- Fix rate limiter balance [#135](https://github.com/uber/jaeger-client-go/pull/135) [#140](https://github.com/uber/jaeger-client-go/pull/140)
+- Default client to send Jaeger.thrift [#147](https://github.com/uber/jaeger-client-go/pull/147)
+- Save baggage in span [#153](https://github.com/uber/jaeger-client-go/pull/153)
+- Move reporter.queueLength to the top of the struct to guarantee 64bit alignment [#158](https://github.com/uber/jaeger-client-go/pull/158)
+- Support HTTP transport with jaeger.thrift [#161](https://github.com/uber/jaeger-client-go/pull/161)
+
+
+2.6.0 (2017-03-28)
+------------------
+
+- Add config option to initialize RPC Metrics feature
+
+
+2.5.0 (2017-03-23)
+------------------
+
+- Split request latency metric by success/failure [#123](https://github.com/uber/jaeger-client-go/pull/123)
+- Add mutex to adaptive sampler and fix race condition [#124](https://github.com/uber/jaeger-client-go/pull/124)
+- Fix rate limiter panic [#125](https://github.com/uber/jaeger-client-go/pull/125)
+
+
+2.4.0 (2017-03-21)
+------------------
+
+- Remove `_ms` suffix from request latency metric name [#121](https://github.com/uber/jaeger-client-go/pull/121)
+- Rename all metrics to "request" and "http_request" and use tags for other dimensions [#121](https://github.com/uber/jaeger-client-go/pull/121)
+
+
+2.3.0 (2017-03-20)
+------------------
+
+- Make Span type public to allow access to non-std methods for testing [#117](https://github.com/uber/jaeger-client-go/pull/117)
+- Add a structured way to extract traces for logging with zap [#118](https://github.com/uber/jaeger-client-go/pull/118)
+
+
+2.2.1 (2017-03-14)
+------------------
+
+- Fix panic caused by updating the remote sampler from adaptive sampler to any other sampler type (https://github.com/uber/jaeger-client-go/pull/111)
+
+
+2.2.0 (2017-03-10)
+------------------
+
+- Introduce Observer and SpanObserver (https://github.com/uber/jaeger-client-go/pull/94)
+- Add RPC metrics emitter as Observer/SpanObserver (https://github.com/uber/jaeger-client-go/pull/103)
+
+
+2.1.2 (2017-02-27)
+-------------------
+
+- Fix leaky bucket bug (https://github.com/uber/jaeger-client-go/pull/99)
+- Fix zap logger Infof (https://github.com/uber/jaeger-client-go/pull/100)
+- Add tracer initialization godoc examples
+
+
+2.1.1 (2017-02-21)
+-------------------
+
+- Fix inefficient usage of zap.Logger
+
+
+2.1.0 (2017-02-17)
+-------------------
+
+- Add adapter for zap.Logger (https://github.com/uber-go/zap)
+- Move logging API to ./log/ package
+
+
+2.0.0 (2017-02-08)
+-------------------
+
+- Support Adaptive Sampling
+- Support 128bit Trace IDs
+- Change trace/span IDs from uint64 to strong types TraceID and SpanID
+- Add Zipkin HTTP B3 Propagation format support #72
+- Rip out existing metrics and use github.com/uber/jaeger-lib/metrics
+- Change API for tracer, reporter, sampler initialization
+
+
+1.6.0 (2016-10-14)
+-------------------
+
+- Add Zipkin HTTP transport
+- Support external baggage via jaeger-baggage header
+- Unpin Thrift version, keep to master
+
+
+1.5.1 (2016-09-27)
+-------------------
+
+- Relax dependency on opentracing to ^1
+
+
+1.5.0 (2016-09-27)
+-------------------
+
+- Upgrade to opentracing-go 1.0
+- Support KV logging for Spans
+
+
+1.4.0 (2016-09-14)
+-------------------
+
+- Support debug traces via HTTP header "jaeger-debug-id"

vendor/src/github.com/jaegertracing/jaeger-client-go/CONTRIBUTING.md

@@ -0,0 +1,62 @@
+# Contributing to `jaeger-client-go`
+
+We'd love your help! If you would like to contribute code you can do so through GitHub
+by forking the repository and sending a pull request into the `master` branch.
+
+## Getting Started
+
+This library uses [glide](https://github.com/Masterminds/glide) to manage dependencies.
+
+The library's import path is `github.com/uber/jaeger-client-go`.
+
+To get started:
+
+```bash
+git submodule update --init --recursive
+glide install
+make test
+```
+
+## Making A Change
+
+*Before making any significant changes, please [open an
+issue](https://github.com/uber/jaeger-client-go/issues).* Discussing your proposed
+changes ahead of time will make the contribution process smooth for everyone.
+
+Once we've discussed your changes and you've got your code ready, make sure
+that tests are passing (`make test` or `make cover`) and open your PR! Your
+pull request is most likely to be accepted if it:
+
+* Includes tests for new functionality.
+* Follows the guidelines in [Effective
+  Go](https://golang.org/doc/effective_go.html) and the [Go team's common code
+  review comments](https://github.com/golang/go/wiki/CodeReviewComments).
+* Has a [good commit
+  message](http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html).
+
+## Cutting a Release
+
+See [RELEASE.md](./RELEASE.md)
+
+## License
+
+By contributing your code, you agree to license your contribution under the terms of the [Apache 2.0 License](LICENSE).
+
+If you are adding a new file it should have a header like below. The easiest way to add such header is to run `make fmt`.
+
+```
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+```
+

vendor/src/github.com/jaegertracing/jaeger-client-go/LICENSE

@@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
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+      "You" (or "Your") shall mean an individual or Legal Entity
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+      any Contribution intentionally submitted for inclusion in the Work
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+   END OF TERMS AND CONDITIONS
+
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+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
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+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.

vendor/src/github.com/jaegertracing/jaeger-client-go/Makefile

@@ -0,0 +1,104 @@
+PROJECT_ROOT=github.com/uber/jaeger-client-go
+PACKAGES := $(shell glide novendor | grep -v ./thrift-gen/...)
+# all .go files that don't exist in hidden directories
+ALL_SRC := $(shell find . -name "*.go" | grep -v -e vendor -e thrift-gen \
+        -e ".*/\..*" \
+        -e ".*/_.*" \
+        -e ".*/mocks.*")
+
+-include crossdock/rules.mk
+
+export GO15VENDOREXPERIMENT=1
+
+RACE=-race
+GOTEST=go test -v $(RACE)
+GOLINT=golint
+GOVET=go vet
+GOFMT=gofmt
+FMT_LOG=fmt.log
+LINT_LOG=lint.log
+
+THRIFT_VER=0.9.3
+THRIFT_IMG=thrift:$(THRIFT_VER)
+THRIFT=docker run -v "${PWD}:/data" $(THRIFT_IMG) thrift
+THRIFT_GO_ARGS=thrift_import="github.com/apache/thrift/lib/go/thrift"
+THRIFT_GEN_DIR=thrift-gen
+
+PASS=$(shell printf "\033[32mPASS\033[0m")
+FAIL=$(shell printf "\033[31mFAIL\033[0m")
+COLORIZE=sed ''/PASS/s//$(PASS)/'' | sed ''/FAIL/s//$(FAIL)/''
+
+.DEFAULT_GOAL := test-and-lint
+
+.PHONY: test-and-lint
+test-and-lint: test fmt lint
+
+.PHONY: test
+test:
+	bash -c "set -e; set -o pipefail; $(GOTEST) $(PACKAGES) | $(COLORIZE)"
+
+.PHONY: fmt
+fmt:
+	$(GOFMT) -e -s -l -w $(ALL_SRC)
+	./scripts/updateLicenses.sh
+
+.PHONY: lint
+lint:
+	$(GOVET) $(PACKAGES)
+	@cat /dev/null > $(LINT_LOG)
+	@$(foreach pkg, $(PACKAGES), $(GOLINT) $(pkg) | grep -v crossdock/thrift >> $(LINT_LOG) || true;)
+	@[ ! -s "$(LINT_LOG)" ] || (echo "Lint Failures" | cat - $(LINT_LOG) && false)
+	@$(GOFMT) -e -s -l $(ALL_SRC) > $(FMT_LOG)
+	@[ ! -s "$(FMT_LOG)" ] || (echo "Go Fmt Failures, run 'make fmt'" | cat - $(FMT_LOG) && false)
+
+
+.PHONY: install
+install:
+	glide --version || go get github.com/Masterminds/glide
+	glide install
+
+
+.PHONY: cover
+cover:
+	./scripts/cover.sh $(shell go list $(PACKAGES))
+	go tool cover -html=cover.out -o cover.html
+
+
+# This is not part of the regular test target because we don't want to slow it
+# down.
+.PHONY: test-examples
+test-examples:
+	make -C examples
+
+# TODO at the moment we're not generating tchan_*.go files
+thrift: idl-submodule thrift-image
+	$(THRIFT) -o /data --gen go:$(THRIFT_GO_ARGS) --out /data/$(THRIFT_GEN_DIR) /data/idl/thrift/agent.thrift
+	sed -i '' 's|"zipkincore"|"$(PROJECT_ROOT)/thrift-gen/zipkincore"|g' $(THRIFT_GEN_DIR)/agent/*.go
+	$(THRIFT) -o /data --gen go:$(THRIFT_GO_ARGS) --out /data/$(THRIFT_GEN_DIR) /data/idl/thrift/sampling.thrift
+	$(THRIFT) -o /data --gen go:$(THRIFT_GO_ARGS) --out /data/$(THRIFT_GEN_DIR) /data/idl/thrift/jaeger.thrift
+	$(THRIFT) -o /data --gen go:$(THRIFT_GO_ARGS) --out /data/$(THRIFT_GEN_DIR) /data/idl/thrift/zipkincore.thrift
+	$(THRIFT) -o /data --gen go:$(THRIFT_GO_ARGS) --out /data/$(THRIFT_GEN_DIR) /data/idl/thrift/baggage.thrift
+	rm -rf thrift-gen/*/*-remote
+	$(THRIFT) -o /data --gen go:$(THRIFT_GO_ARGS) --out /data/crossdock/thrift/ /data/idl/thrift/crossdock/tracetest.thrift
+	rm -rf crossdock/thrift/*/*-remote
+
+idl-submodule:
+	git submodule init
+	git submodule update
+
+thrift-image:
+	$(THRIFT) -version
+
+.PHONY: install_ci
+install_ci: install
+	go get github.com/wadey/gocovmerge
+	go get github.com/mattn/goveralls
+	go get golang.org/x/tools/cmd/cover
+	go get github.com/golang/lint/golint
+
+
+.PHONY: test_ci
+test_ci:
+	@./scripts/cover.sh $(shell go list $(PACKAGES))
+	make lint
+

vendor/src/github.com/jaegertracing/jaeger-client-go/README.md

@@ -0,0 +1,226 @@
+[![GoDoc][doc-img]][doc] [![Build Status][ci-img]][ci] [![Coverage Status][cov-img]][cov] [![OpenTracing 1.0 Enabled][ot-img]][ot-url]
+
+# Jaeger Bindings for Go OpenTracing API
+
+This is a client side library that implements an
+[OpenTracing](http://opentracing.io) Tracer,
+with Zipkin-compatible data model.
+
+## Installation
+
+We recommended using a dependency manager like [glide](https://github.com/Masterminds/glide)
+and [semantic versioning](http://semver.org/) when including this library into an application.
+For example, Jaeger backend imports this library like this:
+
+```yaml
+- package: github.com/uber/jaeger-client-go
+  version: ^2.7.0
+```
+
+If you instead want to use the latest version in `master`, you can pull it via `go get`.
+Note that during `go get` you may see build errors due to incompatible dependencies, which is why
+we recommend using semantic versions for dependencioes.  The error  may be fixed by running
+`make install` (it will install `glide` if you don't have it):
+
+```shell
+go get -u github.com/uber/jaeger-client-go/
+cd $GOPATH/src/github.com/uber/jaeger-client-go/
+git submodule update --init --recursive
+make install
+```
+
+## Initialization
+
+See tracer initialization examples in [godoc](https://godoc.org/github.com/uber/jaeger-client-go/config#pkg-examples)
+and [config/example_test.go](./config/example_test.go).
+
+### Closing the tracer via `io.Closer`
+
+The constructor functions for Jaeger Tracer return the tracer itself and an `io.Closer` instance.
+It is recommended to structure your `main()` so that it calls the `Close()` function on the closer
+before exiting, e.g.
+
+```go
+tracer, closer, err := cfg.New(...)
+defer closer.Close()
+```
+
+This is especially useful for command-line tools that enable tracing, as well as
+for the long-running apps that support graceful shutdown. For example, if your deployment
+system sends SIGTERM instead of killing the process and you trap that signal to do a graceful
+exit, then having `defer closer.Closer()` ensures that all buffered spans are flushed.
+
+### Metrics & Monitoring
+
+The tracer emits a number of different metrics, defined in
+[metrics.go](metrics.go). The monitoring backend is expected to support
+tag-based metric names, e.g. instead of `statsd`-style string names
+like `counters.my-service.jaeger.spans.started.sampled`, the metrics
+are defined by a short name and a collection of key/value tags, for
+example: `name:traces, state:started, sampled:true`.
+
+The monitoring backend is represented by the
+[StatsReporter](stats_reporter.go) interface. An implementation
+of that interface should be passed to the `New` method during
+tracer initialization:
+
+```go
+    stats := // create StatsReporter implementation
+    tracer := config.Tracing.New("your-service-name", stats)
+```
+
+By default, a no-op `NullStatsReporter` is used.
+
+### Logging
+
+The tracer can be configured with an optional logger, which will be
+used to log communication errors, or log spans if a logging reporter
+option is specified in the configuration. The logging API is abstracted
+by the [Logger](logger.go) interface. A logger instance implementing
+this interface can be set on the `Config` object before calling the
+`New` method.
+
+Besides the [zap](https://github.com/uber-go/zap) implementation
+bundled with this package there is also a [go-kit](https://github.com/go-kit/kit)
+one in the [jaeger-lib](https://github.com/uber/jaeger-lib) repository.
+
+## Instrumentation for Tracing
+
+Since this tracer is fully compliant with OpenTracing API 1.0,
+all code instrumentation should only use the API itself, as described
+in the [opentracing-go]
+(https://github.com/opentracing/opentracing-go) documentation.
+
+## Features
+
+### Reporters
+
+A "reporter" is a component receives the finished spans and reports
+them to somewhere. Under normal circumstances, the Tracer
+should use the default `RemoteReporter`, which sends the spans out of
+process via configurable "transport". For testing purposes, one can
+use an `InMemoryReporter` that accumulates spans in a buffer and
+allows to retrieve them for later verification. Also available are
+`NullReporter`, a no-op reporter that does nothing, a `LoggingReporter`
+which logs all finished spans using their `String()` method, and a
+`CompositeReporter` that can be used to combine more than one reporter
+into one, e.g. to attach a logging reporter to the main remote reporter.
+
+### Span Reporting Transports
+
+The remote reporter uses "transports" to actually send the spans out
+of process. Currently two supported transports are Thrift over UDP
+and Thrift over TChannel. More transports will be added in the future.
+
+The only data format currently used is Zipkin Thrift 1.x span format,
+which allows easy integration of the tracer with Zipkin backend.
+
+### Sampling
+
+The tracer does not record all spans, but only those that have the
+sampling bit set in the `flags`. When a new trace is started and a new
+unique ID is generated, a sampling decision is made whether this trace
+should be sampled. The sampling decision is propagated to all downstream
+calls via the `flags` field of the trace context. The following samplers
+are available:
+  1. `RemotelyControlledSampler` uses one of the other simpler samplers
+     and periodically updates it by polling an external server. This
+     allows dynamic control of the sampling strategies.
+  1. `ConstSampler` always makes the same sampling decision for all
+     trace IDs. it can be configured to either sample all traces, or
+     to sample none.
+  1. `ProbabilisticSampler` uses a fixed sampling rate as a probability
+     for a given trace to be sampled. The actual decision is made by
+     comparing the trace ID with a random number multiplied by the
+     sampling rate.
+  1. `RateLimitingSampler` can be used to allow only a certain fixed
+     number of traces to be sampled per second.
+
+### Baggage Injection
+
+The OpenTracing spec allows for [baggage](https://github.com/opentracing/specification/blob/master/specification.md#set-a-baggage-item),
+which are key value pairs that are added to the span context and propagated
+throughout the trace.
+An external process can inject baggage by setting the special
+HTTP Header `jaeger-baggage` on a request
+
+```sh
+curl -H "jaeger-baggage: key1=value1, key2=value2" http://myhost.com
+```
+
+Baggage can also be programatically set inside your service by doing
+the following
+
+```go
+if span := opentracing.SpanFromContext(ctx); span != nil {
+    span.SetBaggageItem("key", "value")
+}
+```
+
+Another service downstream of that can retrieve the baggage in a similar way:
+
+```go
+if span := opentracing.SpanFromContext(ctx); span != nil {
+    val := span.BaggageItem("key")
+    println(val)
+}
+```
+
+### Debug Traces (Forced Sampling)
+
+#### Programmatically
+
+The OpenTracing API defines a `sampling.priority` standard tag that
+can be used to affect the sampling of a span and its children:
+
+```go
+import (
+    "github.com/opentracing/opentracing-go"
+    "github.com/opentracing/opentracing-go/ext"
+)
+
+span := opentracing.SpanFromContext(ctx)
+ext.SamplingPriority.Set(span, 1)    
+```
+
+#### Via HTTP Headers
+
+Jaeger Tracer also understands a special HTTP Header `jaeger-debug-id`,
+which can be set in the incoming request, e.g.
+
+```sh
+curl -H "jaeger-debug-id: some-correlation-id" http://myhost.com
+```
+
+When Jaeger sees this header in the request that otherwise has no
+tracing context, it ensures that the new trace started for this
+request will be sampled in the "debug" mode (meaning it should survive
+all downsampling that might happen in the collection pipeline), and the
+root span will have a tag as if this statement was executed:
+
+```go
+span.SetTag("jaeger-debug-id", "some-correlation-id")
+```
+
+This allows using Jaeger UI to find the trace by this tag.
+
+### Zipkin HTTP B3 compatible header propagation
+
+Jaeger Tracer supports Zipkin B3 Propagation HTTP headers, which are used
+by a lot of Zipkin tracers. This means that you can use Jaeger in conjunction with e.g. [these OpenZipkin tracers](https://github.com/openzipkin).
+
+However it is not the default propagation format, see [here](zipkin/README.md#NewZipkinB3HTTPHeaderPropagator) how to set it up.
+
+## License
+
+[Apache 2.0 License](LICENSE).
+
+
+[doc-img]: https://godoc.org/github.com/uber/jaeger-client-go?status.svg
+[doc]: https://godoc.org/github.com/uber/jaeger-client-go
+[ci-img]: https://travis-ci.org/uber/jaeger-client-go.svg?branch=master
+[ci]: https://travis-ci.org/uber/jaeger-client-go
+[cov-img]: https://coveralls.io/repos/uber/jaeger-client-go/badge.svg?branch=master&service=github
+[cov]: https://coveralls.io/github/uber/jaeger-client-go?branch=master
+[ot-img]: https://img.shields.io/badge/OpenTracing--1.0-enabled-blue.svg
+[ot-url]: http://opentracing.io

vendor/src/github.com/jaegertracing/jaeger-client-go/RELEASE.md

@@ -0,0 +1,11 @@
+# Release Process
+
+1. Create a PR "Preparing for release X.Y.Z" against master branch
+    * Alter CHANGELOG.md from `<placeholder_version> (unreleased)` to `<X.Y.Z> (YYYY-MM-DD)`
+    * Update `JaegerClientVersion` in constants.go to `Go-X.Y.Z`
+2. Create a release "Release X.Y.Z" on Github
+    * Create Tag `vX.Y.Z`
+    * Copy CHANGELOG.md into the release notes
+3. Create a PR "Back to development" against master branch
+    * Add `<next_version> (unreleased)` to CHANGELOG.md
+    * Update `JaegerClientVersion` in constants.go to `Go-<next_version>dev`

vendor/src/github.com/jaegertracing/jaeger-client-go/baggage_setter.go

@@ -0,0 +1,77 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package jaeger
+
+import (
+	"github.com/opentracing/opentracing-go/log"
+
+	"github.com/uber/jaeger-client-go/internal/baggage"
+)
+
+// baggageSetter is an actor that can set a baggage value on a Span given certain
+// restrictions (eg. maxValueLength).
+type baggageSetter struct {
+	restrictionManager baggage.RestrictionManager
+	metrics            *Metrics
+}
+
+func newBaggageSetter(restrictionManager baggage.RestrictionManager, metrics *Metrics) *baggageSetter {
+	return &baggageSetter{
+		restrictionManager: restrictionManager,
+		metrics:            metrics,
+	}
+}
+
+// (NB) span should hold the lock before making this call
+func (s *baggageSetter) setBaggage(span *Span, key, value string) {
+	var truncated bool
+	var prevItem string
+	restriction := s.restrictionManager.GetRestriction(span.serviceName(), key)
+	if !restriction.KeyAllowed() {
+		s.logFields(span, key, value, prevItem, truncated, restriction.KeyAllowed())
+		s.metrics.BaggageUpdateFailure.Inc(1)
+		return
+	}
+	if len(value) > restriction.MaxValueLength() {
+		truncated = true
+		value = value[:restriction.MaxValueLength()]
+		s.metrics.BaggageTruncate.Inc(1)
+	}
+	prevItem = span.context.baggage[key]
+	s.logFields(span, key, value, prevItem, truncated, restriction.KeyAllowed())
+	span.context = span.context.WithBaggageItem(key, value)
+	s.metrics.BaggageUpdateSuccess.Inc(1)
+}
+
+func (s *baggageSetter) logFields(span *Span, key, value, prevItem string, truncated, valid bool) {
+	if !span.context.IsSampled() {
+		return
+	}
+	fields := []log.Field{
+		log.String("event", "baggage"),
+		log.String("key", key),
+		log.String("value", value),
+	}
+	if prevItem != "" {
+		fields = append(fields, log.String("override", "true"))
+	}
+	if truncated {
+		fields = append(fields, log.String("truncated", "true"))
+	}
+	if !valid {
+		fields = append(fields, log.String("invalid", "true"))
+	}
+	span.logFieldsNoLocking(fields...)
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/baggage_setter_test.go

@@ -0,0 +1,126 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package jaeger
+
+import (
+	"testing"
+
+	"github.com/opentracing/opentracing-go"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"github.com/uber/jaeger-lib/metrics"
+	"github.com/uber/jaeger-lib/metrics/testutils"
+
+	"github.com/uber/jaeger-client-go/internal/baggage"
+)
+
+func withTracerAndMetrics(f func(tracer *Tracer, metrics *Metrics, factory *metrics.LocalFactory)) {
+	factory := metrics.NewLocalFactory(0)
+	m := NewMetrics(factory, nil)
+
+	service := "DOOP"
+	tracer, closer := NewTracer(service, NewConstSampler(true), NewNullReporter())
+	defer closer.Close()
+	f(tracer.(*Tracer), m, factory)
+}
+
+func TestTruncateBaggage(t *testing.T) {
+	withTracerAndMetrics(func(tracer *Tracer, metrics *Metrics, factory *metrics.LocalFactory) {
+		setter := newBaggageSetter(baggage.NewDefaultRestrictionManager(5), metrics)
+		key := "key"
+		value := "01234567890"
+		expected := "01234"
+
+		parent := tracer.StartSpan("parent").(*Span)
+		parent.context = parent.context.WithBaggageItem(key, value)
+		span := tracer.StartSpan("child", opentracing.ChildOf(parent.Context())).(*Span)
+
+		setter.setBaggage(span, key, value)
+		assertBaggageFields(t, span, key, expected, true, true, false)
+		assert.Equal(t, expected, span.context.baggage[key])
+
+		testutils.AssertCounterMetrics(t, factory,
+			testutils.ExpectedMetric{
+				Name:  "jaeger.baggage-truncate",
+				Value: 1,
+			},
+			testutils.ExpectedMetric{
+				Name:  "jaeger.baggage-update",
+				Tags:  map[string]string{"result": "ok"},
+				Value: 1,
+			},
+		)
+	})
+}
+
+type keyNotAllowedBaggageRestrictionManager struct{}
+
+func (m *keyNotAllowedBaggageRestrictionManager) GetRestriction(service, key string) *baggage.Restriction {
+	return baggage.NewRestriction(false, 0)
+}
+
+func TestInvalidBaggage(t *testing.T) {
+	withTracerAndMetrics(func(tracer *Tracer, metrics *Metrics, factory *metrics.LocalFactory) {
+		setter := newBaggageSetter(&keyNotAllowedBaggageRestrictionManager{}, metrics)
+		key := "key"
+		value := "value"
+
+		span := tracer.StartSpan("span").(*Span)
+
+		setter.setBaggage(span, key, value)
+		assertBaggageFields(t, span, key, value, false, false, true)
+		assert.Empty(t, span.context.baggage[key])
+
+		testutils.AssertCounterMetrics(t, factory,
+			testutils.ExpectedMetric{
+				Name:  "jaeger.baggage-update",
+				Tags:  map[string]string{"result": "err"},
+				Value: 1,
+			},
+		)
+	})
+}
+
+func TestNotSampled(t *testing.T) {
+	withTracerAndMetrics(func(_ *Tracer, metrics *Metrics, factory *metrics.LocalFactory) {
+		tracer, closer := NewTracer("svc", NewConstSampler(false), NewNullReporter())
+		defer closer.Close()
+
+		setter := newBaggageSetter(baggage.NewDefaultRestrictionManager(10), metrics)
+		span := tracer.StartSpan("span").(*Span)
+		setter.setBaggage(span, "key", "value")
+		assert.Empty(t, span.logs, "No baggage fields should be created if span is not sampled")
+	})
+}
+
+func assertBaggageFields(t *testing.T, sp *Span, key, value string, override, truncated, invalid bool) {
+	require.Len(t, sp.logs, 1)
+	keys := map[string]struct{}{}
+	for _, field := range sp.logs[0].Fields {
+		keys[field.String()] = struct{}{}
+	}
+	assert.Contains(t, keys, "event:baggage")
+	assert.Contains(t, keys, "key:"+key)
+	assert.Contains(t, keys, "value:"+value)
+	if invalid {
+		assert.Contains(t, keys, "invalid:true")
+	}
+	if override {
+		assert.Contains(t, keys, "override:true")
+	}
+	if truncated {
+		assert.Contains(t, keys, "truncated:true")
+	}
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/config/config.go

@@ -0,0 +1,287 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package config
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"strings"
+	"time"
+
+	"github.com/opentracing/opentracing-go"
+
+	"github.com/uber/jaeger-client-go"
+	"github.com/uber/jaeger-client-go/internal/baggage/remote"
+	"github.com/uber/jaeger-client-go/rpcmetrics"
+)
+
+const defaultSamplingProbability = 0.001
+
+// Configuration configures and creates Jaeger Tracer
+type Configuration struct {
+	Disabled            bool                       `yaml:"disabled"`
+	Sampler             *SamplerConfig             `yaml:"sampler"`
+	Reporter            *ReporterConfig            `yaml:"reporter"`
+	Headers             *jaeger.HeadersConfig      `yaml:"headers"`
+	RPCMetrics          bool                       `yaml:"rpc_metrics"`
+	BaggageRestrictions *BaggageRestrictionsConfig `yaml:"baggage_restrictions"`
+}
+
+// SamplerConfig allows initializing a non-default sampler.  All fields are optional.
+type SamplerConfig struct {
+	// Type specifies the type of the sampler: const, probabilistic, rateLimiting, or remote
+	Type string `yaml:"type"`
+
+	// Param is a value passed to the sampler.
+	// Valid values for Param field are:
+	// - for "const" sampler, 0 or 1 for always false/true respectively
+	// - for "probabilistic" sampler, a probability between 0 and 1
+	// - for "rateLimiting" sampler, the number of spans per second
+	// - for "remote" sampler, param is the same as for "probabilistic"
+	//   and indicates the initial sampling rate before the actual one
+	//   is received from the mothership
+	Param float64 `yaml:"param"`
+
+	// SamplingServerURL is the address of jaeger-agent's HTTP sampling server
+	SamplingServerURL string `yaml:"samplingServerURL"`
+
+	// MaxOperations is the maximum number of operations that the sampler
+	// will keep track of. If an operation is not tracked, a default probabilistic
+	// sampler will be used rather than the per operation specific sampler.
+	MaxOperations int `yaml:"maxOperations"`
+
+	// SamplingRefreshInterval controls how often the remotely controlled sampler will poll
+	// jaeger-agent for the appropriate sampling strategy.
+	SamplingRefreshInterval time.Duration `yaml:"samplingRefreshInterval"`
+}
+
+// ReporterConfig configures the reporter. All fields are optional.
+type ReporterConfig struct {
+	// QueueSize controls how many spans the reporter can keep in memory before it starts dropping
+	// new spans. The queue is continuously drained by a background go-routine, as fast as spans
+	// can be sent out of process.
+	QueueSize int `yaml:"queueSize"`
+
+	// BufferFlushInterval controls how often the buffer is force-flushed, even if it's not full.
+	// It is generally not useful, as it only matters for very low traffic services.
+	BufferFlushInterval time.Duration
+
+	// LogSpans, when true, enables LoggingReporter that runs in parallel with the main reporter
+	// and logs all submitted spans. Main Configuration.Logger must be initialized in the code
+	// for this option to have any effect.
+	LogSpans bool `yaml:"logSpans"`
+
+	// LocalAgentHostPort instructs reporter to send spans to jaeger-agent at this address
+	LocalAgentHostPort string `yaml:"localAgentHostPort"`
+}
+
+// BaggageRestrictionsConfig configures the baggage restrictions manager which can be used to whitelist
+// certain baggage keys. All fields are optional.
+type BaggageRestrictionsConfig struct {
+	// DenyBaggageOnInitializationFailure controls the startup failure mode of the baggage restriction
+	// manager. If true, the manager will not allow any baggage to be written until baggage restrictions have
+	// been retrieved from jaeger-agent. If false, the manager wil allow any baggage to be written until baggage
+	// restrictions have been retrieved from jaeger-agent.
+	DenyBaggageOnInitializationFailure bool `yaml:"denyBaggageOnInitializationFailure"`
+
+	// HostPort is the hostPort of jaeger-agent's baggage restrictions server
+	HostPort string `yaml:"hostPort"`
+
+	// RefreshInterval controls how often the baggage restriction manager will poll
+	// jaeger-agent for the most recent baggage restrictions.
+	RefreshInterval time.Duration `yaml:"refreshInterval"`
+}
+
+type nullCloser struct{}
+
+func (*nullCloser) Close() error { return nil }
+
+// New creates a new Jaeger Tracer, and a closer func that can be used to flush buffers
+// before shutdown.
+func (c Configuration) New(
+	serviceName string,
+	options ...Option,
+) (opentracing.Tracer, io.Closer, error) {
+	if serviceName == "" {
+		return nil, nil, errors.New("no service name provided")
+	}
+	if c.Disabled {
+		return &opentracing.NoopTracer{}, &nullCloser{}, nil
+	}
+	opts := applyOptions(options...)
+	tracerMetrics := jaeger.NewMetrics(opts.metrics, nil)
+	if c.RPCMetrics {
+		Observer(
+			rpcmetrics.NewObserver(
+				opts.metrics.Namespace("jaeger-rpc", map[string]string{"component": "jaeger"}),
+				rpcmetrics.DefaultNameNormalizer,
+			),
+		)(&opts) // adds to c.observers
+	}
+	if c.Sampler == nil {
+		c.Sampler = &SamplerConfig{
+			Type:  jaeger.SamplerTypeRemote,
+			Param: defaultSamplingProbability,
+		}
+	}
+	if c.Reporter == nil {
+		c.Reporter = &ReporterConfig{}
+	}
+
+	sampler, err := c.Sampler.NewSampler(serviceName, tracerMetrics)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	reporter := opts.reporter
+	if reporter == nil {
+		r, err := c.Reporter.NewReporter(serviceName, tracerMetrics, opts.logger)
+		if err != nil {
+			return nil, nil, err
+		}
+		reporter = r
+	}
+
+	tracerOptions := []jaeger.TracerOption{
+		jaeger.TracerOptions.Metrics(tracerMetrics),
+		jaeger.TracerOptions.Logger(opts.logger),
+		jaeger.TracerOptions.CustomHeaderKeys(c.Headers),
+		jaeger.TracerOptions.Gen128Bit(opts.gen128Bit),
+		jaeger.TracerOptions.ZipkinSharedRPCSpan(opts.zipkinSharedRPCSpan),
+	}
+
+	for _, tag := range opts.tags {
+		tracerOptions = append(tracerOptions, jaeger.TracerOptions.Tag(tag.Key, tag.Value))
+	}
+
+	for _, obs := range opts.observers {
+		tracerOptions = append(tracerOptions, jaeger.TracerOptions.Observer(obs))
+	}
+
+	for _, cobs := range opts.contribObservers {
+		tracerOptions = append(tracerOptions, jaeger.TracerOptions.ContribObserver(cobs))
+	}
+
+	if c.BaggageRestrictions != nil {
+		mgr := remote.NewRestrictionManager(
+			serviceName,
+			remote.Options.Metrics(tracerMetrics),
+			remote.Options.Logger(opts.logger),
+			remote.Options.HostPort(c.BaggageRestrictions.HostPort),
+			remote.Options.RefreshInterval(c.BaggageRestrictions.RefreshInterval),
+			remote.Options.DenyBaggageOnInitializationFailure(
+				c.BaggageRestrictions.DenyBaggageOnInitializationFailure,
+			),
+		)
+		tracerOptions = append(tracerOptions, jaeger.TracerOptions.BaggageRestrictionManager(mgr))
+	}
+
+	tracer, closer := jaeger.NewTracer(
+		serviceName,
+		sampler,
+		reporter,
+		tracerOptions...)
+
+	return tracer, closer, nil
+}
+
+// InitGlobalTracer creates a new Jaeger Tracer, and sets it as global OpenTracing Tracer.
+// It returns a closer func that can be used to flush buffers before shutdown.
+func (c Configuration) InitGlobalTracer(
+	serviceName string,
+	options ...Option,
+) (io.Closer, error) {
+	if c.Disabled {
+		return &nullCloser{}, nil
+	}
+	tracer, closer, err := c.New(serviceName, options...)
+	if err != nil {
+		return nil, err
+	}
+	opentracing.InitGlobalTracer(tracer)
+	return closer, nil
+}
+
+// NewSampler creates a new sampler based on the configuration
+func (sc *SamplerConfig) NewSampler(
+	serviceName string,
+	metrics *jaeger.Metrics,
+) (jaeger.Sampler, error) {
+	samplerType := strings.ToLower(sc.Type)
+	if samplerType == jaeger.SamplerTypeConst {
+		return jaeger.NewConstSampler(sc.Param != 0), nil
+	}
+	if samplerType == jaeger.SamplerTypeProbabilistic {
+		if sc.Param >= 0 && sc.Param <= 1.0 {
+			return jaeger.NewProbabilisticSampler(sc.Param)
+		}
+		return nil, fmt.Errorf(
+			"Invalid Param for probabilistic sampler: %v. Expecting value between 0 and 1",
+			sc.Param,
+		)
+	}
+	if samplerType == jaeger.SamplerTypeRateLimiting {
+		return jaeger.NewRateLimitingSampler(sc.Param), nil
+	}
+	if samplerType == jaeger.SamplerTypeRemote || sc.Type == "" {
+		sc2 := *sc
+		sc2.Type = jaeger.SamplerTypeProbabilistic
+		initSampler, err := sc2.NewSampler(serviceName, nil)
+		if err != nil {
+			return nil, err
+		}
+		options := []jaeger.SamplerOption{
+			jaeger.SamplerOptions.Metrics(metrics),
+			jaeger.SamplerOptions.InitialSampler(initSampler),
+			jaeger.SamplerOptions.SamplingServerURL(sc.SamplingServerURL),
+		}
+		if sc.MaxOperations != 0 {
+			options = append(options, jaeger.SamplerOptions.MaxOperations(sc.MaxOperations))
+		}
+		if sc.SamplingRefreshInterval != 0 {
+			options = append(options, jaeger.SamplerOptions.SamplingRefreshInterval(sc.SamplingRefreshInterval))
+		}
+		return jaeger.NewRemotelyControlledSampler(serviceName, options...), nil
+	}
+	return nil, fmt.Errorf("Unknown sampler type %v", sc.Type)
+}
+
+// NewReporter instantiates a new reporter that submits spans to tcollector
+func (rc *ReporterConfig) NewReporter(
+	serviceName string,
+	metrics *jaeger.Metrics,
+	logger jaeger.Logger,
+) (jaeger.Reporter, error) {
+	sender, err := rc.newTransport()
+	if err != nil {
+		return nil, err
+	}
+	reporter := jaeger.NewRemoteReporter(
+		sender,
+		jaeger.ReporterOptions.QueueSize(rc.QueueSize),
+		jaeger.ReporterOptions.BufferFlushInterval(rc.BufferFlushInterval),
+		jaeger.ReporterOptions.Logger(logger),
+		jaeger.ReporterOptions.Metrics(metrics))
+	if rc.LogSpans && logger != nil {
+		logger.Infof("Initializing logging reporter\n")
+		reporter = jaeger.NewCompositeReporter(jaeger.NewLoggingReporter(logger), reporter)
+	}
+	return reporter, err
+}
+
+func (rc *ReporterConfig) newTransport() (jaeger.Transport, error) {
+	return jaeger.NewUDPTransport(rc.LocalAgentHostPort, 0)
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/config/config_test.go

@@ -0,0 +1,259 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package config
+
+import (
+	"testing"
+	"time"
+
+	"github.com/opentracing/opentracing-go"
+	"github.com/opentracing/opentracing-go/ext"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"github.com/uber/jaeger-lib/metrics"
+	"github.com/uber/jaeger-lib/metrics/testutils"
+
+	"github.com/uber/jaeger-client-go"
+	"github.com/uber/jaeger-client-go/log"
+)
+
+func TestNewSamplerConst(t *testing.T) {
+	constTests := []struct {
+		param    float64
+		decision bool
+	}{{1, true}, {0, false}}
+	for _, tst := range constTests {
+		cfg := &SamplerConfig{Type: jaeger.SamplerTypeConst, Param: tst.param}
+		s, err := cfg.NewSampler("x", nil)
+		require.NoError(t, err)
+		s1, ok := s.(*jaeger.ConstSampler)
+		require.True(t, ok, "converted to constSampler")
+		require.Equal(t, tst.decision, s1.Decision, "decision")
+	}
+}
+
+func TestNewSamplerProbabilistic(t *testing.T) {
+	constTests := []struct {
+		param float64
+		error bool
+	}{{1.5, true}, {0.5, false}}
+	for _, tst := range constTests {
+		cfg := &SamplerConfig{Type: jaeger.SamplerTypeProbabilistic, Param: tst.param}
+		s, err := cfg.NewSampler("x", nil)
+		if tst.error {
+			require.Error(t, err)
+		} else {
+			require.NoError(t, err)
+			_, ok := s.(*jaeger.ProbabilisticSampler)
+			require.True(t, ok, "converted to ProbabilisticSampler")
+		}
+	}
+}
+
+func TestDefaultSampler(t *testing.T) {
+	cfg := Configuration{
+		Sampler: &SamplerConfig{Type: "InvalidType"},
+	}
+	_, _, err := cfg.New("testService")
+	require.Error(t, err)
+}
+
+func TestInvalidSamplerType(t *testing.T) {
+	cfg := &SamplerConfig{MaxOperations: 10}
+	s, err := cfg.NewSampler("x", jaeger.NewNullMetrics())
+	require.NoError(t, err)
+	rcs, ok := s.(*jaeger.RemotelyControlledSampler)
+	require.True(t, ok, "converted to RemotelyControlledSampler")
+	rcs.Close()
+}
+
+func TestDefaultConfig(t *testing.T) {
+	cfg := Configuration{}
+	_, _, err := cfg.New("", Metrics(metrics.NullFactory), Logger(log.NullLogger))
+	require.EqualError(t, err, "no service name provided")
+
+	_, closer, err := cfg.New("testService")
+	defer closer.Close()
+	require.NoError(t, err)
+}
+
+func TestDisabledFlag(t *testing.T) {
+	cfg := Configuration{Disabled: true}
+	_, closer, err := cfg.New("testService")
+	defer closer.Close()
+	require.NoError(t, err)
+}
+
+func TestNewReporterError(t *testing.T) {
+	cfg := Configuration{
+		Reporter: &ReporterConfig{LocalAgentHostPort: "bad_local_agent"},
+	}
+	_, _, err := cfg.New("testService")
+	require.Error(t, err)
+}
+
+func TestInitGlobalTracer(t *testing.T) {
+	// Save the existing GlobalTracer and replace after finishing function
+	prevTracer := opentracing.GlobalTracer()
+	defer opentracing.InitGlobalTracer(prevTracer)
+	noopTracer := opentracing.NoopTracer{}
+
+	tests := []struct {
+		cfg           Configuration
+		shouldErr     bool
+		tracerChanged bool
+	}{
+		{
+			cfg:           Configuration{Disabled: true},
+			shouldErr:     false,
+			tracerChanged: false,
+		},
+		{
+			cfg:           Configuration{Sampler: &SamplerConfig{Type: "InvalidType"}},
+			shouldErr:     true,
+			tracerChanged: false,
+		},
+		{
+			cfg: Configuration{
+				Sampler: &SamplerConfig{
+					Type: "remote",
+					SamplingRefreshInterval: 1,
+				},
+			},
+			shouldErr:     false,
+			tracerChanged: true,
+		},
+		{
+			cfg:           Configuration{},
+			shouldErr:     false,
+			tracerChanged: true,
+		},
+	}
+	for _, test := range tests {
+		opentracing.InitGlobalTracer(noopTracer)
+		_, err := test.cfg.InitGlobalTracer("testService")
+		if test.shouldErr {
+			require.Error(t, err)
+		} else {
+			require.NoError(t, err)
+		}
+		if test.tracerChanged {
+			require.NotEqual(t, noopTracer, opentracing.GlobalTracer())
+		} else {
+			require.Equal(t, noopTracer, opentracing.GlobalTracer())
+		}
+	}
+}
+
+func TestConfigWithReporter(t *testing.T) {
+	c := Configuration{
+		Sampler: &SamplerConfig{
+			Type:  "const",
+			Param: 1,
+		},
+	}
+	r := jaeger.NewInMemoryReporter()
+	tracer, closer, err := c.New("test", Reporter(r))
+	require.NoError(t, err)
+	defer closer.Close()
+
+	tracer.StartSpan("test").Finish()
+	assert.Len(t, r.GetSpans(), 1)
+}
+
+func TestConfigWithRPCMetrics(t *testing.T) {
+	metrics := metrics.NewLocalFactory(0)
+	c := Configuration{
+		Sampler: &SamplerConfig{
+			Type:  "const",
+			Param: 1,
+		},
+		RPCMetrics: true,
+	}
+	r := jaeger.NewInMemoryReporter()
+	tracer, closer, err := c.New(
+		"test",
+		Reporter(r),
+		Metrics(metrics),
+		ContribObserver(fakeContribObserver{}),
+	)
+	require.NoError(t, err)
+	defer closer.Close()
+
+	tracer.StartSpan("test", ext.SpanKindRPCServer).Finish()
+
+	testutils.AssertCounterMetrics(t, metrics,
+		testutils.ExpectedMetric{
+			Name:  "jaeger-rpc.requests",
+			Tags:  map[string]string{"component": "jaeger", "endpoint": "test", "error": "false"},
+			Value: 1,
+		},
+	)
+}
+
+func TestBaggageRestrictionsConfig(t *testing.T) {
+	m := metrics.NewLocalFactory(0)
+	c := Configuration{
+		BaggageRestrictions: &BaggageRestrictionsConfig{
+			HostPort:        "not:1929213",
+			RefreshInterval: time.Minute,
+		},
+	}
+	_, closer, err := c.New(
+		"test",
+		Metrics(m),
+	)
+	require.NoError(t, err)
+	defer closer.Close()
+
+	metricName := "jaeger.baggage-restrictions-update"
+	metricTags := map[string]string{"result": "err"}
+	key := metrics.GetKey(metricName, metricTags, "|", "=")
+	for i := 0; i < 100; i++ {
+		// wait until the async initialization call is complete
+		counters, _ := m.Snapshot()
+		if _, ok := counters[key]; ok {
+			break
+		}
+		time.Sleep(time.Millisecond)
+	}
+
+	testutils.AssertCounterMetrics(t, m,
+		testutils.ExpectedMetric{
+			Name:  metricName,
+			Tags:  metricTags,
+			Value: 1,
+		},
+	)
+}
+
+func TestConfigWithGen128Bit(t *testing.T) {
+	c := Configuration{
+		Sampler: &SamplerConfig{
+			Type:  "const",
+			Param: 1,
+		},
+		RPCMetrics: true,
+	}
+	tracer, closer, err := c.New("test", Gen128Bit(true))
+	require.NoError(t, err)
+	defer closer.Close()
+
+	span := tracer.StartSpan("test")
+	defer span.Finish()
+	traceID := span.Context().(jaeger.SpanContext).TraceID()
+	require.True(t, traceID.High != 0)
+	require.True(t, traceID.Low != 0)
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/config/example_test.go

@@ -0,0 +1,84 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package config_test
+
+import (
+	"log"
+
+	"github.com/uber/jaeger-lib/metrics"
+
+	"github.com/uber/jaeger-client-go"
+	jaegercfg "github.com/uber/jaeger-client-go/config"
+	jaegerlog "github.com/uber/jaeger-client-go/log"
+)
+
+func ExampleConfiguration_InitGlobalTracer_testing() {
+	// Sample configuration for testing. Use constant sampling to sample every trace
+	// and enable LogSpan to log every span via configured Logger.
+	cfg := jaegercfg.Configuration{
+		Sampler: &jaegercfg.SamplerConfig{
+			Type:  jaeger.SamplerTypeConst,
+			Param: 1,
+		},
+		Reporter: &jaegercfg.ReporterConfig{
+			LogSpans: true,
+		},
+	}
+
+	// Example logger and metrics factory. Use github.com/uber/jaeger-client-go/log
+	// and github.com/uber/jaeger-lib/metrics respectively to bind to real logging and metrics
+	// frameworks.
+	jLogger := jaegerlog.StdLogger
+	jMetricsFactory := metrics.NullFactory
+
+	// Initialize tracer with a logger and a metrics factory
+	closer, err := cfg.InitGlobalTracer(
+		"serviceName",
+		jaegercfg.Logger(jLogger),
+		jaegercfg.Metrics(jMetricsFactory),
+	)
+	if err != nil {
+		log.Printf("Could not initialize jaeger tracer: %s", err.Error())
+		return
+	}
+	defer closer.Close()
+
+	// continue main()
+}
+
+func ExampleConfiguration_InitGlobalTracer_production() {
+	// Recommended configuration for production.
+	cfg := jaegercfg.Configuration{}
+
+	// Example logger and metrics factory. Use github.com/uber/jaeger-client-go/log
+	// and github.com/uber/jaeger-lib/metrics respectively to bind to real logging and metrics
+	// frameworks.
+	jLogger := jaegerlog.StdLogger
+	jMetricsFactory := metrics.NullFactory
+
+	// Initialize tracer with a logger and a metrics factory
+	closer, err := cfg.InitGlobalTracer(
+		"serviceName",
+		jaegercfg.Logger(jLogger),
+		jaegercfg.Metrics(jMetricsFactory),
+	)
+	if err != nil {
+		log.Printf("Could not initialize jaeger tracer: %s", err.Error())
+		return
+	}
+	defer closer.Close()
+
+	// continue main()
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/config/options.go

@@ -0,0 +1,113 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package config
+
+import (
+	opentracing "github.com/opentracing/opentracing-go"
+	"github.com/uber/jaeger-lib/metrics"
+
+	"github.com/uber/jaeger-client-go"
+)
+
+// Option is a function that sets some option on the client.
+type Option func(c *Options)
+
+// Options control behavior of the client.
+type Options struct {
+	metrics             metrics.Factory
+	logger              jaeger.Logger
+	reporter            jaeger.Reporter
+	contribObservers    []jaeger.ContribObserver
+	observers           []jaeger.Observer
+	gen128Bit           bool
+	zipkinSharedRPCSpan bool
+	tags                []opentracing.Tag
+}
+
+// Metrics creates an Option that initializes Metrics in the tracer,
+// which is used to emit statistics about spans.
+func Metrics(factory metrics.Factory) Option {
+	return func(c *Options) {
+		c.metrics = factory
+	}
+}
+
+// Logger can be provided to log Reporter errors, as well as to log spans
+// if Reporter.LogSpans is set to true.
+func Logger(logger jaeger.Logger) Option {
+	return func(c *Options) {
+		c.logger = logger
+	}
+}
+
+// Reporter can be provided explicitly to override the configuration.
+// Useful for testing, e.g. by passing InMemoryReporter.
+func Reporter(reporter jaeger.Reporter) Option {
+	return func(c *Options) {
+		c.reporter = reporter
+	}
+}
+
+// Observer can be registered with the Tracer to receive notifications about new Spans.
+func Observer(observer jaeger.Observer) Option {
+	return func(c *Options) {
+		c.observers = append(c.observers, observer)
+	}
+}
+
+// ContribObserver can be registered with the Tracer to recieve notifications
+// about new spans.
+func ContribObserver(observer jaeger.ContribObserver) Option {
+	return func(c *Options) {
+		c.contribObservers = append(c.contribObservers, observer)
+	}
+}
+
+// Gen128Bit specifies whether to generate 128bit trace IDs.
+func Gen128Bit(gen128Bit bool) Option {
+	return func(c *Options) {
+		c.gen128Bit = gen128Bit
+	}
+}
+
+// ZipkinSharedRPCSpan creates an option that enables sharing span ID between client
+// and server spans a la zipkin. If false, client and server spans will be assigned
+// different IDs.
+func ZipkinSharedRPCSpan(zipkinSharedRPCSpan bool) Option {
+	return func(c *Options) {
+		c.zipkinSharedRPCSpan = zipkinSharedRPCSpan
+	}
+}
+
+// Tag creates an option that adds a tracer-level tag.
+func Tag(key string, value interface{}) Option {
+	return func(c *Options) {
+		c.tags = append(c.tags, opentracing.Tag{Key: key, Value: value})
+	}
+}
+
+func applyOptions(options ...Option) Options {
+	opts := Options{}
+	for _, option := range options {
+		option(&opts)
+	}
+	if opts.metrics == nil {
+		opts.metrics = metrics.NullFactory
+	}
+	if opts.logger == nil {
+		opts.logger = jaeger.NullLogger
+	}
+	return opts
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/config/options_test.go

@@ -0,0 +1,72 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package config
+
+import (
+	"testing"
+
+	opentracing "github.com/opentracing/opentracing-go"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"github.com/uber/jaeger-lib/metrics"
+
+	"github.com/uber/jaeger-client-go"
+)
+
+func TestApplyOptions(t *testing.T) {
+	metricsFactory := metrics.NewLocalFactory(0)
+	observer := fakeObserver{}
+	contribObserver := fakeContribObserver{}
+	opts := applyOptions(
+		Metrics(metricsFactory),
+		Logger(jaeger.StdLogger),
+		Observer(observer),
+		ContribObserver(contribObserver),
+		Gen128Bit(true),
+		ZipkinSharedRPCSpan(true),
+	)
+	assert.Equal(t, jaeger.StdLogger, opts.logger)
+	assert.Equal(t, metricsFactory, opts.metrics)
+	assert.Equal(t, []jaeger.Observer{observer}, opts.observers)
+	assert.Equal(t, []jaeger.ContribObserver{contribObserver}, opts.contribObservers)
+	assert.True(t, opts.gen128Bit)
+	assert.True(t, opts.zipkinSharedRPCSpan)
+}
+
+func TestTraceTagOption(t *testing.T) {
+	c := Configuration{}
+	tracer, closer, err := c.New("test-service", Tag("tag-key", "tag-value"))
+	require.NoError(t, err)
+	defer closer.Close()
+	assert.Equal(t, opentracing.Tag{Key: "tag-key", Value: "tag-value"}, tracer.(*jaeger.Tracer).Tags()[0])
+}
+
+func TestApplyOptionsDefaults(t *testing.T) {
+	opts := applyOptions()
+	assert.Equal(t, jaeger.NullLogger, opts.logger)
+	assert.Equal(t, metrics.NullFactory, opts.metrics)
+}
+
+type fakeObserver struct{}
+
+func (o fakeObserver) OnStartSpan(operationName string, options opentracing.StartSpanOptions) jaeger.SpanObserver {
+	return nil
+}
+
+type fakeContribObserver struct{}
+
+func (o fakeContribObserver) OnStartSpan(span opentracing.Span, operationName string, options opentracing.StartSpanOptions) (jaeger.ContribSpanObserver, bool) {
+	return nil, false
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/constants.go

@@ -0,0 +1,76 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package jaeger
+
+const (
+	// JaegerClientVersion is the version of the client library reported as Span tag.
+	JaegerClientVersion = "Go-2.9.1dev"
+
+	// JaegerClientVersionTagKey is the name of the tag used to report client version.
+	JaegerClientVersionTagKey = "jaeger.version"
+
+	// JaegerDebugHeader is the name of HTTP header or a TextMap carrier key which,
+	// if found in the carrier, forces the trace to be sampled as "debug" trace.
+	// The value of the header is recorded as the tag on the root span, so that the
+	// trace can be found in the UI using this value as a correlation ID.
+	JaegerDebugHeader = "jaeger-debug-id"
+
+	// JaegerBaggageHeader is the name of the HTTP header that is used to submit baggage.
+	// It differs from TraceBaggageHeaderPrefix in that it can be used only in cases where
+	// a root span does not exist.
+	JaegerBaggageHeader = "jaeger-baggage"
+
+	// TracerHostnameTagKey used to report host name of the process.
+	TracerHostnameTagKey = "hostname"
+
+	// TracerIPTagKey used to report ip of the process.
+	TracerIPTagKey = "ip"
+
+	// SamplerTypeTagKey reports which sampler was used on the root span.
+	SamplerTypeTagKey = "sampler.type"
+
+	// SamplerParamTagKey reports the parameter of the sampler, like sampling probability.
+	SamplerParamTagKey = "sampler.param"
+
+	// TraceContextHeaderName is the http header name used to propagate tracing context.
+	// This must be in lower-case to avoid mismatches when decoding incoming headers.
+	TraceContextHeaderName = "uber-trace-id"
+
+	// TracerStateHeaderName is deprecated.
+	// Deprecated: use TraceContextHeaderName
+	TracerStateHeaderName = TraceContextHeaderName
+
+	// TraceBaggageHeaderPrefix is the prefix for http headers used to propagate baggage.
+	// This must be in lower-case to avoid mismatches when decoding incoming headers.
+	TraceBaggageHeaderPrefix = "uberctx-"
+
+	// SamplerTypeConst is the type of sampler that always makes the same decision.
+	SamplerTypeConst = "const"
+
+	// SamplerTypeRemote is the type of sampler that polls Jaeger agent for sampling strategy.
+	SamplerTypeRemote = "remote"
+
+	// SamplerTypeProbabilistic is the type of sampler that samples traces
+	// with a certain fixed probability.
+	SamplerTypeProbabilistic = "probabilistic"
+
+	// SamplerTypeRateLimiting is the type of sampler that samples
+	// only up to a fixed number of traces per second.
+	SamplerTypeRateLimiting = "ratelimiting"
+
+	// SamplerTypeLowerBound is the type of sampler that samples
+	// only up to a fixed number of traces per second.
+	SamplerTypeLowerBound = "lowerbound"
+)

vendor/src/github.com/jaegertracing/jaeger-client-go/constants_test.go

@@ -0,0 +1,29 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package jaeger
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestHeaderConstants(t *testing.T) {
+	if TraceContextHeaderName != strings.ToLower(TraceContextHeaderName) {
+		t.Errorf("TraceContextHeaderName is not lower-case: %+v", TraceContextHeaderName)
+	}
+	if TraceBaggageHeaderPrefix != strings.ToLower(TraceBaggageHeaderPrefix) {
+		t.Errorf("TraceBaggageHeaderPrefix is not lower-case: %+v", TraceBaggageHeaderPrefix)
+	}
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/context.go

@@ -0,0 +1,258 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package jaeger
+
+import (
+	"errors"
+	"fmt"
+	"strconv"
+	"strings"
+)
+
+const (
+	flagSampled = byte(1)
+	flagDebug   = byte(2)
+)
+
+var (
+	errEmptyTracerStateString     = errors.New("Cannot convert empty string to tracer state")
+	errMalformedTracerStateString = errors.New("String does not match tracer state format")
+
+	emptyContext = SpanContext{}
+)
+
+// TraceID represents unique 128bit identifier of a trace
+type TraceID struct {
+	High, Low uint64
+}
+
+// SpanID represents unique 64bit identifier of a span
+type SpanID uint64
+
+// SpanContext represents propagated span identity and state
+type SpanContext struct {
+	// traceID represents globally unique ID of the trace.
+	// Usually generated as a random number.
+	traceID TraceID
+
+	// spanID represents span ID that must be unique within its trace,
+	// but does not have to be globally unique.
+	spanID SpanID
+
+	// parentID refers to the ID of the parent span.
+	// Should be 0 if the current span is a root span.
+	parentID SpanID
+
+	// flags is a bitmap containing such bits as 'sampled' and 'debug'.
+	flags byte
+
+	// Distributed Context baggage. The is a snapshot in time.
+	baggage map[string]string
+
+	// debugID can be set to some correlation ID when the context is being
+	// extracted from a TextMap carrier.
+	//
+	// See JaegerDebugHeader in constants.go
+	debugID string
+}
+
+// ForeachBaggageItem implements ForeachBaggageItem() of opentracing.SpanContext
+func (c SpanContext) ForeachBaggageItem(handler func(k, v string) bool) {
+	for k, v := range c.baggage {
+		if !handler(k, v) {
+			break
+		}
+	}
+}
+
+// IsSampled returns whether this trace was chosen for permanent storage
+// by the sampling mechanism of the tracer.
+func (c SpanContext) IsSampled() bool {
+	return (c.flags & flagSampled) == flagSampled
+}
+
+// IsDebug indicates whether sampling was explicitly requested by the service.
+func (c SpanContext) IsDebug() bool {
+	return (c.flags & flagDebug) == flagDebug
+}
+
+// IsValid indicates whether this context actually represents a valid trace.
+func (c SpanContext) IsValid() bool {
+	return c.traceID.IsValid() && c.spanID != 0
+}
+
+func (c SpanContext) String() string {
+	if c.traceID.High == 0 {
+		return fmt.Sprintf("%x:%x:%x:%x", c.traceID.Low, uint64(c.spanID), uint64(c.parentID), c.flags)
+	}
+	return fmt.Sprintf("%x%016x:%x:%x:%x", c.traceID.High, c.traceID.Low, uint64(c.spanID), uint64(c.parentID), c.flags)
+}
+
+// ContextFromString reconstructs the Context encoded in a string
+func ContextFromString(value string) (SpanContext, error) {
+	var context SpanContext
+	if value == "" {
+		return emptyContext, errEmptyTracerStateString
+	}
+	parts := strings.Split(value, ":")
+	if len(parts) != 4 {
+		return emptyContext, errMalformedTracerStateString
+	}
+	var err error
+	if context.traceID, err = TraceIDFromString(parts[0]); err != nil {
+		return emptyContext, err
+	}
+	if context.spanID, err = SpanIDFromString(parts[1]); err != nil {
+		return emptyContext, err
+	}
+	if context.parentID, err = SpanIDFromString(parts[2]); err != nil {
+		return emptyContext, err
+	}
+	flags, err := strconv.ParseUint(parts[3], 10, 8)
+	if err != nil {
+		return emptyContext, err
+	}
+	context.flags = byte(flags)
+	return context, nil
+}
+
+// TraceID returns the trace ID of this span context
+func (c SpanContext) TraceID() TraceID {
+	return c.traceID
+}
+
+// SpanID returns the span ID of this span context
+func (c SpanContext) SpanID() SpanID {
+	return c.spanID
+}
+
+// ParentID returns the parent span ID of this span context
+func (c SpanContext) ParentID() SpanID {
+	return c.parentID
+}
+
+// NewSpanContext creates a new instance of SpanContext
+func NewSpanContext(traceID TraceID, spanID, parentID SpanID, sampled bool, baggage map[string]string) SpanContext {
+	flags := byte(0)
+	if sampled {
+		flags = flagSampled
+	}
+	return SpanContext{
+		traceID:  traceID,
+		spanID:   spanID,
+		parentID: parentID,
+		flags:    flags,
+		baggage:  baggage}
+}
+
+// CopyFrom copies data from ctx into this context, including span identity and baggage.
+// TODO This is only used by interop.go. Remove once TChannel Go supports OpenTracing.
+func (c *SpanContext) CopyFrom(ctx *SpanContext) {
+	c.traceID = ctx.traceID
+	c.spanID = ctx.spanID
+	c.parentID = ctx.parentID
+	c.flags = ctx.flags
+	if l := len(ctx.baggage); l > 0 {
+		c.baggage = make(map[string]string, l)
+		for k, v := range ctx.baggage {
+			c.baggage[k] = v
+		}
+	} else {
+		c.baggage = nil
+	}
+}
+
+// WithBaggageItem creates a new context with an extra baggage item.
+func (c SpanContext) WithBaggageItem(key, value string) SpanContext {
+	var newBaggage map[string]string
+	if c.baggage == nil {
+		newBaggage = map[string]string{key: value}
+	} else {
+		newBaggage = make(map[string]string, len(c.baggage)+1)
+		for k, v := range c.baggage {
+			newBaggage[k] = v
+		}
+		newBaggage[key] = value
+	}
+	// Use positional parameters so the compiler will help catch new fields.
+	return SpanContext{c.traceID, c.spanID, c.parentID, c.flags, newBaggage, ""}
+}
+
+// isDebugIDContainerOnly returns true when the instance of the context is only
+// used to return the debug/correlation ID from extract() method. This happens
+// in the situation when "jaeger-debug-id" header is passed in the carrier to
+// the extract() method, but the request otherwise has no span context in it.
+// Previously this would've returned opentracing.ErrSpanContextNotFound from the
+// extract method, but now it returns a dummy context with only debugID filled in.
+//
+// See JaegerDebugHeader in constants.go
+// See textMapPropagator#Extract
+func (c *SpanContext) isDebugIDContainerOnly() bool {
+	return !c.traceID.IsValid() && c.debugID != ""
+}
+
+// ------- TraceID -------
+
+func (t TraceID) String() string {
+	if t.High == 0 {
+		return fmt.Sprintf("%x", t.Low)
+	}
+	return fmt.Sprintf("%x%016x", t.High, t.Low)
+}
+
+// TraceIDFromString creates a TraceID from a hexadecimal string
+func TraceIDFromString(s string) (TraceID, error) {
+	var hi, lo uint64
+	var err error
+	if len(s) > 32 {
+		return TraceID{}, fmt.Errorf("TraceID cannot be longer than 32 hex characters: %s", s)
+	} else if len(s) > 16 {
+		hiLen := len(s) - 16
+		if hi, err = strconv.ParseUint(s[0:hiLen], 16, 64); err != nil {
+			return TraceID{}, err
+		}
+		if lo, err = strconv.ParseUint(s[hiLen:], 16, 64); err != nil {
+			return TraceID{}, err
+		}
+	} else {
+		if lo, err = strconv.ParseUint(s, 16, 64); err != nil {
+			return TraceID{}, err
+		}
+	}
+	return TraceID{High: hi, Low: lo}, nil
+}
+
+// IsValid checks if the trace ID is valid, i.e. not zero.
+func (t TraceID) IsValid() bool {
+	return t.High != 0 || t.Low != 0
+}
+
+// ------- SpanID -------
+
+func (s SpanID) String() string {
+	return fmt.Sprintf("%x", uint64(s))
+}
+
+// SpanIDFromString creates a SpanID from a hexadecimal string
+func SpanIDFromString(s string) (SpanID, error) {
+	if len(s) > 16 {
+		return SpanID(0), fmt.Errorf("SpanID cannot be longer than 16 hex characters: %s", s)
+	}
+	id, err := strconv.ParseUint(s, 16, 64)
+	if err != nil {
+		return SpanID(0), err
+	}
+	return SpanID(id), nil
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/context_test.go

@@ -0,0 +1,110 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package jaeger
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestContextFromString(t *testing.T) {
+	var err error
+	_, err = ContextFromString("")
+	assert.Error(t, err)
+	_, err = ContextFromString("abcd")
+	assert.Error(t, err)
+	_, err = ContextFromString("x:1:1:1")
+	assert.Error(t, err)
+	_, err = ContextFromString("1:x:1:1")
+	assert.Error(t, err)
+	_, err = ContextFromString("1:1:x:1")
+	assert.Error(t, err)
+	_, err = ContextFromString("1:1:1:x")
+	assert.Error(t, err)
+	_, err = ContextFromString("1:1:1:x")
+	assert.Error(t, err)
+	_, err = ContextFromString("01234567890123456789012345678901234:1:1:1")
+	assert.Error(t, err)
+	_, err = ContextFromString("01234567890123456789012345678901:1:1:1")
+	assert.NoError(t, err)
+	_, err = ContextFromString("01234_67890123456789012345678901:1:1:1")
+	assert.Error(t, err)
+	_, err = ContextFromString("0123456789012345678901_345678901:1:1:1")
+	assert.Error(t, err)
+	_, err = ContextFromString("1:0123456789012345:1:1")
+	assert.NoError(t, err)
+	_, err = ContextFromString("1:01234567890123456:1:1")
+	assert.Error(t, err)
+	ctx, err := ContextFromString("10000000000000001:1:1:1")
+	assert.NoError(t, err)
+	assert.EqualValues(t, TraceID{High: 1, Low: 1}, ctx.traceID)
+	ctx, err = ContextFromString("1:1:1:1")
+	assert.NoError(t, err)
+	assert.EqualValues(t, TraceID{Low: 1}, ctx.traceID)
+	assert.EqualValues(t, 1, ctx.spanID)
+	assert.EqualValues(t, 1, ctx.parentID)
+	assert.EqualValues(t, 1, ctx.flags)
+	ctx = NewSpanContext(TraceID{Low: 1}, 1, 1, true, nil)
+	assert.EqualValues(t, TraceID{Low: 1}, ctx.traceID)
+	assert.EqualValues(t, 1, ctx.spanID)
+	assert.EqualValues(t, 1, ctx.parentID)
+	assert.EqualValues(t, 1, ctx.flags)
+	assert.Equal(t, "ff", SpanID(255).String())
+	assert.Equal(t, "ff", TraceID{Low: 255}.String())
+	assert.Equal(t, "ff00000000000000ff", TraceID{High: 255, Low: 255}.String())
+	ctx = NewSpanContext(TraceID{High: 255, Low: 255}, SpanID(1), SpanID(1), false, nil)
+	assert.Equal(t, "ff00000000000000ff:1:1:0", ctx.String())
+}
+
+func TestSpanContext_WithBaggageItem(t *testing.T) {
+	var ctx SpanContext
+	ctx = ctx.WithBaggageItem("some-KEY", "Some-Value")
+	assert.Equal(t, map[string]string{"some-KEY": "Some-Value"}, ctx.baggage)
+	ctx = ctx.WithBaggageItem("some-KEY", "Some-Other-Value")
+	assert.Equal(t, map[string]string{"some-KEY": "Some-Other-Value"}, ctx.baggage)
+}
+
+func TestSpanContext_SampledDebug(t *testing.T) {
+	ctx, err := ContextFromString("1:1:1:1")
+	require.NoError(t, err)
+	assert.True(t, ctx.IsSampled())
+	assert.False(t, ctx.IsDebug())
+
+	ctx, err = ContextFromString("1:1:1:3")
+	require.NoError(t, err)
+	assert.True(t, ctx.IsSampled())
+	assert.True(t, ctx.IsDebug())
+
+	ctx, err = ContextFromString("1:1:1:0")
+	require.NoError(t, err)
+	assert.False(t, ctx.IsSampled())
+	assert.False(t, ctx.IsDebug())
+}
+
+func TestSpanContext_CopyFrom(t *testing.T) {
+	ctx, err := ContextFromString("1:1:1:1")
+	require.NoError(t, err)
+	ctx2 := SpanContext{}
+	ctx2.CopyFrom(&ctx)
+	assert.Equal(t, ctx, ctx2)
+	// with baggage
+	ctx = ctx.WithBaggageItem("x", "y")
+	ctx2 = SpanContext{}
+	ctx2.CopyFrom(&ctx)
+	assert.Equal(t, ctx, ctx2)
+	assert.Equal(t, "y", ctx2.baggage["x"])
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/contrib_observer.go

@@ -0,0 +1,56 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package jaeger
+
+import (
+	opentracing "github.com/opentracing/opentracing-go"
+)
+
+// ContribObserver can be registered with the Tracer to receive notifications
+// about new Spans. Modelled after github.com/opentracing-contrib/go-observer.
+type ContribObserver interface {
+	// Create and return a span observer. Called when a span starts.
+	// If the Observer is not interested in the given span, it must return (nil, false).
+	// E.g :
+	//     func StartSpan(opName string, opts ...opentracing.StartSpanOption) {
+	//         var sp opentracing.Span
+	//         sso := opentracing.StartSpanOptions{}
+	//         if spanObserver, ok := Observer.OnStartSpan(span, opName, sso); ok {
+	//             // we have a valid SpanObserver
+	//         }
+	//         ...
+	//     }
+	OnStartSpan(sp opentracing.Span, operationName string, options opentracing.StartSpanOptions) (ContribSpanObserver, bool)
+}
+
+// ContribSpanObserver is created by the Observer and receives notifications
+// about other Span events. This interface is meant to match
+// github.com/opentracing-contrib/go-observer, via duck typing, without
+// directly importing the go-observer package.
+type ContribSpanObserver interface {
+	OnSetOperationName(operationName string)
+	OnSetTag(key string, value interface{})
+	OnFinish(options opentracing.FinishOptions)
+}
+
+// wrapper observer for the old observers (see observer.go)
+type oldObserver struct {
+	obs Observer
+}
+
+func (o *oldObserver) OnStartSpan(sp opentracing.Span, operationName string, options opentracing.StartSpanOptions) (ContribSpanObserver, bool) {
+	spanObserver := o.obs.OnStartSpan(operationName, options)
+	return spanObserver, spanObserver != nil
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/crossdock/Dockerfile

@@ -0,0 +1,4 @@
+FROM scratch
+ADD crossdock /
+CMD ["/crossdock"]
+EXPOSE 8080-8082

vendor/src/github.com/jaegertracing/jaeger-client-go/crossdock/README.md

@@ -0,0 +1,78 @@
+# Crossdock-based Integration Test Suite
+
+This package implements integration test suite for testing 
+interoperability between different Jaeger client libraries.
+
+## Actors
+
+There are five actors participating in any given test case,
+the crossdock driver itself, a Client, and three Servers, S1-S3.
+
+### Driver
+
+The crossdock driver reads axis and test definitions from the YAML file,
+generates permutations based on values listed for each axis, and
+makes an HTTP request to the Client, passing it the selected value
+for each axis.
+
+### Client
+
+Client runs as part of the `jaeger-client/go` image and orchestrates
+the actual test case with the servers S1-S3.  The incoming request
+from the driver is expected to have parameters defined in
+[client/constants.go](client/constants.go), which specify
+
+  1. The type of test to execute (only `trace` is currently supported)
+  1. Whether the trace should be sampled or not
+  1. For each of the servers S1-S3:
+     * the name of the server (same as docker image name, same as host name)
+     * the transport to send request to that server (http or TChannel)
+     * the type of client to use (e.g. in Python, `urllib2` vs. `requests`)
+
+The Client translates the parameters into a "call tree" instruction set,
+and calls S1, which in turn calls S2 with the sub-set of instructions,
+and so on. Upon receiving the response from S1, the Client validates the
+response against the conditions of the test, and returns a summary result
+to the crossdock driver, indicating a success of a failure of the test.
+For the `trace` test type, the success conditions are that at all levels
+the observed tracing spans have the same trace ID, the same sampling flag
+equal to the input `sampled` parameter, and the same value of a baggage
+item. The baggage item value is randomly selected by the client at the
+start of each test.
+
+### Servers
+
+Servers represent examples of business services with Jaeger tracing enabled.
+Servers must be implemented for each supported language, and potentially
+multiple times for a given language depending on the framework used to build
+the service, such as Flask vs. Tornado in Python.  Each implementation of the
+server may act as any of the S1-S3 servers in the test.  Each server must
+implement the `TracedService` interface from
+[thrift/tracetest.thrift](thrift/tracetest.thrift):
+
+    service TracedService {
+        TraceResponse startTrace(1: StartTraceRequest request)
+        TraceResponse joinTrace(1: JoinTraceRequest request)
+    }
+
+  * In `startTrace` the server is supposed to ignore any trace it may have
+    received via inbound request and start a brand new trace, with the
+    sampling flag set appropriately, using `sampling.priority` tag,
+    see [Go server implementation](server/trace.go) for example.
+  * In `joinTrace` the server is supposed to respect the trace in the
+    inbound request and propagate it to the outbound downstream request.
+
+The response from the server contains the information about the current
+tracing span it has observed (or started), including trace ID, sampling
+flag, and the value of a baggage item. For S1 and S2 the response also
+includes the response of the downstream server.
+
+## Running the tests
+
+The intended setup is that every commit to master branch of each of the client
+libraries results in a build of a new docker image (or images, e.g. in Python).
+When a new pull request is tested against one of the libraries, it will build
+a new image from the modified version of the library, and use the existing
+images for the other languages.  The `docker-compose.yaml` file refers to those
+images by name.
+

vendor/src/github.com/jaegertracing/jaeger-client-go/crossdock/client/client.go

@@ -0,0 +1,109 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package client
+
+import (
+	"fmt"
+	"net"
+	"net/http"
+	"sync"
+
+	"github.com/crossdock/crossdock-go"
+
+	"github.com/uber/jaeger-client-go/crossdock/common"
+)
+
+// Client is a controller for the tests
+type Client struct {
+	ClientHostPort     string
+	ServerPortHTTP     string
+	ServerPortTChannel string
+	listener           net.Listener
+	hostMapper         func(service string) string
+}
+
+// Start begins a blocking Crossdock client
+func (c *Client) Start() error {
+	if err := c.Listen(); err != nil {
+		return err
+	}
+	return c.Serve()
+}
+
+// AsyncStart begins a Crossdock client in the background,
+// but does not return until it started serving.
+func (c *Client) AsyncStart() error {
+	if err := c.Listen(); err != nil {
+		return err
+	}
+	var started sync.WaitGroup
+	started.Add(1)
+	go func() {
+		started.Done()
+		c.Serve()
+	}()
+	started.Wait()
+	return nil
+}
+
+// Listen initializes the server
+func (c *Client) Listen() error {
+	c.setDefaultPort(&c.ClientHostPort, ":"+common.DefaultClientPortHTTP)
+	c.setDefaultPort(&c.ServerPortHTTP, common.DefaultServerPortHTTP)
+	c.setDefaultPort(&c.ServerPortTChannel, common.DefaultServerPortTChannel)
+
+	behaviors := crossdock.Behaviors{
+		behaviorTrace: c.trace,
+	}
+
+	http.Handle("/", crossdock.Handler(behaviors, true))
+
+	listener, err := net.Listen("tcp", c.ClientHostPort)
+	if err != nil {
+		return err
+	}
+	c.listener = listener
+	c.ClientHostPort = listener.Addr().String()
+	return nil
+}
+
+// Serve starts service crossdock traffic. This is a blocking call.
+func (c *Client) Serve() error {
+	return http.Serve(c.listener, nil)
+}
+
+// Close stops the client
+func (c *Client) Close() error {
+	return c.listener.Close()
+}
+
+// URL returns a URL that the client can be accessed on
+func (c *Client) URL() string {
+	return fmt.Sprintf("http://%s/", c.ClientHostPort)
+}
+
+func (c *Client) setDefaultPort(port *string, defaultPort string) {
+	if *port == "" {
+		*port = defaultPort
+	}
+}
+
+func (c *Client) mapServiceToHost(service string) string {
+	mapper := c.hostMapper
+	if mapper == nil {
+		return service
+	}
+	return mapper(service)
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/crossdock/client/client_test.go

@@ -0,0 +1,109 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package client
+
+import (
+	"net/url"
+	"testing"
+
+	"github.com/crossdock/crossdock-go"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/uber/jaeger-client-go"
+	"github.com/uber/jaeger-client-go/crossdock/common"
+	"github.com/uber/jaeger-client-go/crossdock/log"
+	"github.com/uber/jaeger-client-go/crossdock/server"
+	jlog "github.com/uber/jaeger-client-go/log"
+)
+
+func TestCrossdock(t *testing.T) {
+	log.Enabled = false // enable when debugging tests
+	log.Printf("Starting crossdock test")
+
+	var reporter jaeger.Reporter
+	if log.Enabled {
+		reporter = jaeger.NewLoggingReporter(jlog.StdLogger)
+	} else {
+		reporter = jaeger.NewNullReporter()
+	}
+
+	tracer, tCloser := jaeger.NewTracer(
+		"crossdock",
+		jaeger.NewConstSampler(false),
+		reporter)
+	defer tCloser.Close()
+
+	s := &server.Server{
+		HostPortHTTP:     "127.0.0.1:0",
+		HostPortTChannel: "127.0.0.1:0",
+		Tracer:           tracer,
+	}
+	err := s.Start()
+	require.NoError(t, err)
+	defer s.Close()
+
+	c := &Client{
+		ClientHostPort:     "127.0.0.1:0",
+		ServerPortHTTP:     s.GetPortHTTP(),
+		ServerPortTChannel: s.GetPortTChannel(),
+		hostMapper:         func(server string) string { return "localhost" },
+	}
+	err = c.AsyncStart()
+	require.NoError(t, err)
+	defer c.Close()
+
+	crossdock.Wait(t, s.URL(), 10)
+	crossdock.Wait(t, c.URL(), 10)
+
+	behaviors := []struct {
+		name string
+		axes map[string][]string
+	}{
+		{
+			name: behaviorTrace,
+			axes: map[string][]string{
+				server1NameParam:      {common.DefaultServiceName},
+				sampledParam:          {"true", "false"},
+				server2NameParam:      {common.DefaultServiceName},
+				server2TransportParam: {transportHTTP, transportTChannel, transportDummy},
+				server3NameParam:      {common.DefaultServiceName},
+				server3TransportParam: {transportHTTP, transportTChannel},
+			},
+		},
+	}
+
+	for _, bb := range behaviors {
+		for _, entry := range crossdock.Combinations(bb.axes) {
+			entryArgs := url.Values{}
+			for k, v := range entry {
+				entryArgs.Set(k, v)
+			}
+			// test via real HTTP call
+			crossdock.Call(t, c.URL(), bb.name, entryArgs)
+		}
+	}
+}
+
+func TestHostMapper(t *testing.T) {
+	c := &Client{
+		ClientHostPort:     "127.0.0.1:0",
+		ServerPortHTTP:     "8080",
+		ServerPortTChannel: "8081",
+	}
+	assert.Equal(t, "go", c.mapServiceToHost("go"))
+	c.hostMapper = func(server string) string { return "localhost" }
+	assert.Equal(t, "localhost", c.mapServiceToHost("go"))
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/crossdock/client/constants.go

@@ -0,0 +1,43 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package client
+
+// Different parameter keys and values used by the system
+const (
+	// S1 instructions
+	sampledParam     = "sampled"
+	server1NameParam = "s1name"
+	// S1->S2 instructions
+	server2NameParam      = "s2name"
+	server2TransportParam = "s2transport"
+	// S2->S3 instructions
+	server3NameParam      = "s3name"
+	server3TransportParam = "s3transport"
+
+	transportHTTP     = "http"
+	transportTChannel = "tchannel"
+	transportDummy    = "dummy"
+
+	behaviorTrace = "trace"
+
+	// RoleS1 is the name of the role for server S1
+	RoleS1 = "S1"
+
+	// RoleS2 is the name of the role for server S2
+	RoleS2 = "S2"
+
+	// RoleS3 is the name of the role for server S3
+	RoleS3 = "S3"
+)

vendor/src/github.com/jaegertracing/jaeger-client-go/crossdock/client/trace.go

@@ -0,0 +1,167 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package client
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/crossdock/crossdock-go"
+	"golang.org/x/net/context"
+
+	"github.com/uber/jaeger-client-go/crossdock/common"
+	"github.com/uber/jaeger-client-go/crossdock/log"
+	"github.com/uber/jaeger-client-go/crossdock/thrift/tracetest"
+	"github.com/uber/jaeger-client-go/utils"
+)
+
+func (c *Client) trace(t crossdock.T) {
+	sampled := str2bool(t.Param(sampledParam))
+	baggage := randomBaggage()
+
+	level1 := tracetest.NewStartTraceRequest()
+	level1.ServerRole = RoleS1
+	level1.Sampled = sampled
+	level1.Baggage = baggage
+	server1 := t.Param(server1NameParam)
+
+	level2 := tracetest.NewDownstream()
+	level2.ServiceName = t.Param(server2NameParam)
+	level2.ServerRole = RoleS2
+	level2.Host = c.mapServiceToHost(level2.ServiceName)
+	level2.Port = c.transport2port(t.Param(server2TransportParam))
+	level2.Transport = transport2transport(t.Param(server2TransportParam))
+	level1.Downstream = level2
+
+	level3 := tracetest.NewDownstream()
+	level3.ServiceName = t.Param(server3NameParam)
+	level3.ServerRole = RoleS3
+	level3.Host = c.mapServiceToHost(level3.ServiceName)
+	level3.Port = c.transport2port(t.Param(server3TransportParam))
+	level3.Transport = transport2transport(t.Param(server3TransportParam))
+	level2.Downstream = level3
+
+	server1host := c.mapServiceToHost(server1)
+	url := fmt.Sprintf("http://%s:%s/start_trace", server1host, c.ServerPortHTTP)
+	resp, err := common.PostJSON(context.Background(), url, level1)
+	if err != nil {
+		t.Errorf(err.Error())
+		return
+	}
+
+	for r := resp; r != nil; r = r.Downstream {
+		if r.NotImplementedError != "" {
+			t.Skipf(r.NotImplementedError)
+			log.Printf("SKIP: %s", r.NotImplementedError)
+			return
+		}
+	}
+
+	traceID := resp.Span.TraceId
+	if traceID == "" {
+		t.Errorf("Trace ID is empty in S1(%s)", server1)
+		return
+	}
+
+	success := validateTrace(t, level1.Downstream, resp, server1, 1, traceID, sampled, baggage)
+	if success {
+		t.Successf("trace checks out")
+		log.Printf("PASS")
+	}
+}
+
+func validateTrace(
+	t crossdock.T,
+	target *tracetest.Downstream,
+	resp *tracetest.TraceResponse,
+	service string,
+	level int,
+	traceID string,
+	sampled bool,
+	baggage string) bool {
+
+	success := true
+	if traceID != resp.Span.TraceId {
+		t.Errorf("Trace ID mismatch in S%d(%s): expected %s, received %s",
+			level, service, traceID, resp.Span.TraceId)
+		success = false
+	}
+	if baggage != resp.Span.Baggage {
+		t.Errorf("Baggage mismatch in S%d(%s): expected %s, received %s",
+			level, service, baggage, resp.Span.Baggage)
+		success = false
+	}
+	if sampled != resp.Span.Sampled {
+		t.Errorf("Sampled mismatch in S%d(%s): expected %t, received %t",
+			level, service, sampled, resp.Span.Sampled)
+		success = false
+	}
+	if target != nil {
+		if resp.Downstream == nil {
+			t.Errorf("Missing downstream in S%d(%s)", level, service)
+			success = false
+		} else {
+			success = validateTrace(t, target.Downstream, resp.Downstream,
+				target.Host, level+1, traceID, sampled, baggage) && success
+		}
+	} else if resp.Downstream != nil {
+		t.Errorf("Unexpected downstream in S%d(%s)", level, service)
+		success = false
+	}
+	return success
+}
+
+func randomBaggage() string {
+	r := utils.NewRand(time.Now().UnixNano())
+	n := uint64(r.Int63())
+	return fmt.Sprintf("%x", n)
+}
+
+func str2bool(v string) bool {
+	switch v {
+	case "true":
+		return true
+	case "false":
+		return false
+	default:
+		panic(v + " is not a Boolean")
+	}
+}
+
+func (c *Client) transport2port(v string) string {
+	switch v {
+	case transportHTTP:
+		return c.ServerPortHTTP
+	case transportTChannel:
+		return c.ServerPortTChannel
+	case transportDummy:
+		return "9999"
+	default:
+		panic("Unknown protocol " + v)
+	}
+}
+
+func transport2transport(v string) tracetest.Transport {
+	switch v {
+	case transportHTTP:
+		return tracetest.Transport_HTTP
+	case transportTChannel:
+		return tracetest.Transport_TCHANNEL
+	case transportDummy:
+		return tracetest.Transport_DUMMY
+	default:
+		panic("Unknown protocol " + v)
+	}
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/crossdock/common/constants.go

@@ -0,0 +1,32 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package common
+
+const (
+	// DefaultClientPortHTTP is the port where the client (controller) runs
+	DefaultClientPortHTTP = "8080"
+
+	// DefaultServerPortHTTP is the port where HTTP server runs
+	DefaultServerPortHTTP = "8081"
+
+	// DefaultServerPortTChannel is the port where TChannel server runs
+	DefaultServerPortTChannel = "8082"
+
+	// DefaultServiceName is the service name used by TChannel server
+	DefaultServiceName = "go"
+
+	// DefaultTracerServiceName is the service name used by the tracer
+	DefaultTracerServiceName = "crossdock-go"
+)

vendor/src/github.com/jaegertracing/jaeger-client-go/crossdock/common/json.go

@@ -0,0 +1,73 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package common
+
+import (
+	"bytes"
+	"encoding/json"
+	"net/http"
+
+	"github.com/uber/jaeger-client-go/crossdock/thrift/tracetest"
+	"github.com/uber/jaeger-client-go/utils"
+
+	"github.com/opentracing/opentracing-go"
+	"github.com/opentracing/opentracing-go/ext"
+	"golang.org/x/net/context"
+)
+
+// PostJSON sends a POST request to `url` with body containing JSON-serialized `req`.
+// It injects tracing span into the headers (if found in the context).
+// It returns parsed TraceResponse, or error.
+func PostJSON(ctx context.Context, url string, req interface{}) (*tracetest.TraceResponse, error) {
+	data, err := json.Marshal(req)
+	if err != nil {
+		return nil, err
+	}
+
+	httpReq, err := http.NewRequest("POST", url, bytes.NewBuffer(data))
+	if err != nil {
+		return nil, err
+	}
+	httpReq.Header.Set("Content-Type", "application/json")
+
+	span, err := injectSpan(ctx, httpReq)
+	if span != nil {
+		defer span.Finish()
+	}
+	if err != nil {
+		return nil, err
+	}
+
+	resp, err := http.DefaultClient.Do(httpReq)
+	if err != nil {
+		return nil, err
+	}
+
+	var result tracetest.TraceResponse
+	err = utils.ReadJSON(resp, &result)
+	return &result, err
+}
+
+func injectSpan(ctx context.Context, req *http.Request) (opentracing.Span, error) {
+	span := opentracing.SpanFromContext(ctx)
+	if span == nil {
+		return nil, nil
+	}
+	span = span.Tracer().StartSpan("post", opentracing.ChildOf(span.Context()))
+	ext.SpanKindRPCClient.Set(span)
+	c := opentracing.HTTPHeadersCarrier(req.Header)
+	err := span.Tracer().Inject(span.Context(), opentracing.HTTPHeaders, c)
+	return span, err
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/crossdock/docker-compose.yml

@@ -0,0 +1,71 @@
+version: '2'
+
+services:
+    crossdock:
+        image: crossdock/crossdock
+        links:
+            - test_driver
+            - go
+            - java
+            - python
+
+        environment:
+            - WAIT_FOR=test_driver,go,java,python
+            - WAIT_FOR_TIMEOUT=60s
+
+            - CALL_TIMEOUT=60s
+
+            - AXIS_CLIENT=go
+            - AXIS_S1NAME=go,java,python
+            - AXIS_SAMPLED=true,false
+            - AXIS_S2NAME=go,java,python
+            - AXIS_S2TRANSPORT=http,tchannel
+            - AXIS_S3NAME=go,java,python
+            - AXIS_S3TRANSPORT=http,tchannel
+
+            - BEHAVIOR_TRACE=client,s1name,sampled,s2name,s2transport,s3name,s3transport
+
+            - AXIS_TESTDRIVER=test_driver
+            - AXIS_SERVICES=go
+
+            - BEHAVIOR_ENDTOEND=testdriver,services
+
+            - REPORT=compact
+    go:
+        build: .
+        ports:
+            - "8080-8082"
+
+    java:
+        image: jaegertracing/xdock-java
+        ports:
+            - "8080-8082"
+
+    python:
+        image: jaegertracing/xdock-py
+        ports:
+            - "8080:8082"
+
+    cassandra:
+        image: "cassandra:3.9"
+
+    test_driver:
+        image: jaegertracing/test-driver
+        links:
+            - cassandra
+        depends_on:
+            - cassandra
+        ports:
+            - "8080"
+
+#    node:
+#        image: yarpc/yarpc-node
+#        ports:
+#            - "8080-8082"
+#
+#    python-sync:
+#        image: yarpc/yarpc-python
+#        ports:
+#            - 8080
+#        environment:
+#            - SYNC=1

vendor/src/github.com/jaegertracing/jaeger-client-go/crossdock/endtoend/handler.go

@@ -0,0 +1,137 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package endtoend
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"sync"
+	"time"
+
+	"github.com/opentracing/opentracing-go"
+
+	"github.com/uber/jaeger-client-go"
+	"github.com/uber/jaeger-client-go/config"
+	"github.com/uber/jaeger-client-go/crossdock/common"
+	"github.com/uber/jaeger-client-go/crossdock/log"
+)
+
+var (
+	defaultSamplerType = jaeger.SamplerTypeRemote
+
+	endToEndConfig = config.Configuration{
+		Disabled: false,
+		Sampler: &config.SamplerConfig{
+			Type:                    defaultSamplerType,
+			Param:                   1.0,
+			SamplingServerURL:       "http://test_driver:5778/sampling",
+			SamplingRefreshInterval: 5 * time.Second,
+		},
+		Reporter: &config.ReporterConfig{
+			BufferFlushInterval: time.Second,
+			LocalAgentHostPort:  "test_driver:5775",
+		},
+	}
+)
+
+/*Handler handles creating traces from a http request.
+ *
+ * json: {
+ *   "type": "remote",
+ *   "operation": "operationName",
+ *   "count": 2,
+ *   "tags": {
+ *     "key": "value"
+ *   }
+ * }
+ *
+ * Given the above json payload, the handler will use a tracer with the RemotelyControlledSampler
+ * to create 2 traces for "operationName" operation with the tags: {"key":"value"}. These traces
+ * are reported to the agent with the hostname "test_driver".
+ */
+type Handler struct {
+	sync.RWMutex
+
+	tracers map[string]opentracing.Tracer
+}
+
+type traceRequest struct {
+	Type      string            `json:"type"`
+	Operation string            `json:"operation"`
+	Tags      map[string]string `json:"tags"`
+	Count     int               `json:"count"`
+}
+
+// NewHandler returns a Handler.
+func NewHandler() *Handler {
+	return &Handler{
+		tracers: make(map[string]opentracing.Tracer),
+	}
+}
+
+// init initializes the handler with a tracer
+func (h *Handler) init(cfg config.Configuration) error {
+	tracer, _, err := cfg.New(common.DefaultTracerServiceName)
+	if err != nil {
+		return err
+	}
+	h.tracers[cfg.Sampler.Type] = tracer
+	return nil
+}
+
+func (h *Handler) getTracer(samplerType string) opentracing.Tracer {
+	if samplerType == "" {
+		samplerType = defaultSamplerType
+	}
+	h.Lock()
+	defer h.Unlock()
+	tracer, ok := h.tracers[samplerType]
+	if !ok {
+		endToEndConfig.Sampler.Type = samplerType
+		if err := h.init(endToEndConfig); err != nil {
+			log.Printf("Failed to create tracer: %s", err.Error())
+			return nil
+		}
+		tracer, _ = h.tracers[samplerType]
+	}
+	return tracer
+}
+
+// GenerateTraces creates traces given the parameters in the request.
+func (h *Handler) GenerateTraces(w http.ResponseWriter, r *http.Request) {
+	decoder := json.NewDecoder(r.Body)
+	var req traceRequest
+	if err := decoder.Decode(&req); err != nil {
+		http.Error(w, fmt.Sprintf("JSON payload is invalid: %s", err.Error()), http.StatusBadRequest)
+		return
+	}
+	tracer := h.getTracer(req.Type)
+	if tracer == nil {
+		http.Error(w, "Tracer is not initialized", http.StatusInternalServerError)
+		return
+	}
+	generateTraces(tracer, &req)
+}
+
+func generateTraces(tracer opentracing.Tracer, r *traceRequest) {
+	for i := 0; i < r.Count; i++ {
+		span := tracer.StartSpan(r.Operation)
+		for k, v := range r.Tags {
+			span.SetTag(k, v)
+		}
+		span.Finish()
+	}
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/crossdock/endtoend/handler_test.go

@@ -0,0 +1,154 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package endtoend
+
+import (
+	"bytes"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+	"time"
+
+	"github.com/opentracing/opentracing-go"
+	"github.com/stretchr/testify/assert"
+
+	"github.com/uber/jaeger-client-go"
+	"github.com/uber/jaeger-client-go/config"
+	"github.com/uber/jaeger-client-go/log"
+)
+
+var (
+	testOperation = "testOperation"
+	testService   = "testService"
+
+	testConfig = config.Configuration{
+		Disabled: false,
+		Sampler: &config.SamplerConfig{
+			Type:              jaeger.SamplerTypeRemote,
+			Param:             1.0,
+			SamplingServerURL: "http://localhost:5778/sampling",
+		},
+		Reporter: &config.ReporterConfig{
+			BufferFlushInterval: time.Second,
+			LocalAgentHostPort:  "localhost:5775",
+		},
+	}
+
+	badConfig = config.Configuration{
+		Disabled: false,
+		Sampler: &config.SamplerConfig{
+			Type: "INVALID_TYPE",
+		},
+	}
+
+	testTraceRequest = traceRequest{
+		Type:      jaeger.SamplerTypeConst,
+		Operation: testOperation,
+		Tags: map[string]string{
+			"key": "value",
+		},
+		Count: 2,
+	}
+
+	testInvalidJSON = `bad_json`
+
+	testTraceJSONRequest = `
+		{
+			"type": "const",
+			"operation": "testOperation",
+			"tags": {
+				"key": "value"
+			},
+			"count": 2
+		}
+	`
+
+	testInvalidTypeJSONRequest = `
+		{
+			"type": "INVALID_TYPE",
+			"operation": "testOperation",
+			"tags": {
+				"key": "value"
+			},
+			"count": 2
+		}
+	`
+)
+
+func newInMemoryTracer() (opentracing.Tracer, *jaeger.InMemoryReporter) {
+	inMemoryReporter := jaeger.NewInMemoryReporter()
+	tracer, _ := jaeger.NewTracer(
+		testService,
+		jaeger.NewConstSampler(true),
+		inMemoryReporter,
+		jaeger.TracerOptions.Metrics(jaeger.NewNullMetrics()),
+		jaeger.TracerOptions.Logger(log.NullLogger))
+	return tracer, inMemoryReporter
+}
+
+func TestInit(t *testing.T) {
+	handler := NewHandler()
+	err := handler.init(testConfig)
+	assert.NoError(t, err)
+}
+
+func TestInitBadConfig(t *testing.T) {
+	handler := NewHandler()
+	err := handler.init(badConfig)
+	assert.Error(t, err)
+}
+
+func TestGetTracer(t *testing.T) {
+	iTracer, _ := newInMemoryTracer()
+	handler := &Handler{tracers: map[string]opentracing.Tracer{jaeger.SamplerTypeConst: iTracer}}
+	tracer := handler.getTracer(jaeger.SamplerTypeConst)
+	assert.Equal(t, iTracer, tracer)
+}
+
+func TestGetTracerError(t *testing.T) {
+	handler := NewHandler()
+	tracer := handler.getTracer("INVALID_TYPE")
+	assert.Nil(t, tracer)
+}
+
+func TestGenerateTraces(t *testing.T) {
+	tracer, _ := newInMemoryTracer()
+
+	tests := []struct {
+		expectedCode int
+		json         string
+		handler      *Handler
+	}{
+		{http.StatusOK, testTraceJSONRequest, &Handler{tracers: map[string]opentracing.Tracer{jaeger.SamplerTypeConst: tracer}}},
+		{http.StatusBadRequest, testInvalidJSON, NewHandler()},
+		{http.StatusInternalServerError, testInvalidTypeJSONRequest, NewHandler()}, // Tracer failed to initialize
+	}
+
+	for _, test := range tests {
+		req, err := http.NewRequest("POST", "/create_spans", bytes.NewBuffer([]byte(test.json)))
+		assert.NoError(t, err, "Failed to initialize request")
+		recorder := httptest.NewRecorder()
+		handlerFunc := http.HandlerFunc(test.handler.GenerateTraces)
+		handlerFunc.ServeHTTP(recorder, req)
+
+		assert.Equal(t, test.expectedCode, recorder.Code)
+	}
+}
+
+func TestGenerateTracesInternal(t *testing.T) {
+	tracer, reporter := newInMemoryTracer()
+	generateTraces(tracer, &testTraceRequest)
+	assert.Equal(t, 2, reporter.SpansSubmitted())
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/crossdock/log/logger.go

@@ -0,0 +1,29 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package log
+
+import (
+	real_log "log"
+)
+
+// Enabled controls logging from crossdock tests. It is enabled in main.go, but off in unit tests.
+var Enabled bool
+
+// Printf delegates to log.Printf if Enabled == true
+func Printf(msg string, args ...interface{}) {
+	if Enabled {
+		real_log.Printf(msg, args)
+	}
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/crossdock/main.go

@@ -0,0 +1,54 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"io"
+
+	"github.com/opentracing/opentracing-go"
+
+	"github.com/uber/jaeger-client-go"
+	"github.com/uber/jaeger-client-go/crossdock/client"
+	"github.com/uber/jaeger-client-go/crossdock/common"
+	"github.com/uber/jaeger-client-go/crossdock/log"
+	"github.com/uber/jaeger-client-go/crossdock/server"
+	jlog "github.com/uber/jaeger-client-go/log"
+)
+
+func main() {
+	log.Enabled = true
+
+	tracer, tCloser := initTracer()
+	defer tCloser.Close()
+
+	s := &server.Server{Tracer: tracer}
+	if err := s.Start(); err != nil {
+		panic(err.Error())
+	} else {
+		defer s.Close()
+	}
+	client := &client.Client{}
+	if err := client.Start(); err != nil {
+		panic(err.Error())
+	}
+}
+
+func initTracer() (opentracing.Tracer, io.Closer) {
+	t, c := jaeger.NewTracer(
+		common.DefaultTracerServiceName,
+		jaeger.NewConstSampler(false),
+		jaeger.NewLoggingReporter(jlog.StdLogger))
+	return t, c
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/crossdock/rules.mk

@@ -0,0 +1,25 @@
+XDOCK_YAML=crossdock/docker-compose.yml
+
+.PHONY: crossdock-linux-bin
+crossdock-linux-bin:
+	CGO_ENABLED=0 GOOS=linux time go build -a -installsuffix cgo -o crossdock/crossdock ./crossdock
+
+.PHONY: crossdock
+crossdock: crossdock-linux-bin
+	docker-compose -f $(XDOCK_YAML) kill go
+	docker-compose -f $(XDOCK_YAML) rm -f go
+	docker-compose -f $(XDOCK_YAML) build go
+	docker-compose -f $(XDOCK_YAML) run crossdock 2>&1 | tee run-crossdock.log
+	grep 'Tests passed!' run-crossdock.log
+
+.PHONY: crossdock-fresh
+crossdock-fresh: crossdock-linux-bin
+	docker-compose -f $(XDOCK_YAML) kill
+	docker-compose -f $(XDOCK_YAML) rm --force
+	docker-compose -f $(XDOCK_YAML) pull
+	docker-compose -f $(XDOCK_YAML) build
+	docker-compose -f $(XDOCK_YAML) run crossdock
+
+.PHONE: crossdock-logs
+crossdock-logs:
+	docker-compose -f $(XDOCK_YAML) logs

vendor/src/github.com/jaegertracing/jaeger-client-go/crossdock/server/constants.go

@@ -0,0 +1,26 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package server
+
+import "errors"
+
+// BaggageKey is the key used to pass baggage item
+const BaggageKey = "crossdock-baggage-key"
+
+var (
+	errNoSpanObserved        = errors.New("no span found in Context")
+	errUnrecognizedProtocol  = errors.New("unrecognized protocol for downstream call")
+	errCannotStartInTChannel = errors.New("cannot start new trace in tchannel server")
+)

vendor/src/github.com/jaegertracing/jaeger-client-go/crossdock/server/server.go

@@ -0,0 +1,164 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package server
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"net"
+	"net/http"
+	"strings"
+	"sync"
+
+	"github.com/opentracing/opentracing-go"
+	"github.com/opentracing/opentracing-go/ext"
+	"github.com/uber/tchannel-go"
+	"golang.org/x/net/context"
+
+	"github.com/uber/jaeger-client-go/crossdock/common"
+	"github.com/uber/jaeger-client-go/crossdock/endtoend"
+	"github.com/uber/jaeger-client-go/crossdock/log"
+	"github.com/uber/jaeger-client-go/crossdock/thrift/tracetest"
+)
+
+// Server implements S1-S3 servers
+type Server struct {
+	HostPortHTTP     string
+	HostPortTChannel string
+	Tracer           opentracing.Tracer
+	listener         net.Listener
+	channel          *tchannel.Channel
+	eHandler         *endtoend.Handler
+}
+
+// Start starts the test server called by the Client and other upstream servers.
+func (s *Server) Start() error {
+	if s.HostPortHTTP == "" {
+		s.HostPortHTTP = ":" + common.DefaultServerPortHTTP
+	}
+	if s.HostPortTChannel == "" {
+		s.HostPortTChannel = ":" + common.DefaultServerPortTChannel
+	}
+
+	if err := s.startTChannelServer(s.Tracer); err != nil {
+		return err
+	}
+	s.eHandler = endtoend.NewHandler()
+
+	mux := http.NewServeMux()
+	mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { return }) // health check
+	mux.HandleFunc("/start_trace", func(w http.ResponseWriter, r *http.Request) {
+		s.handleJSON(w, r, func() interface{} {
+			return tracetest.NewStartTraceRequest()
+		}, func(ctx context.Context, req interface{}) (interface{}, error) {
+			return s.doStartTrace(req.(*tracetest.StartTraceRequest))
+		})
+	})
+	mux.HandleFunc("/join_trace", func(w http.ResponseWriter, r *http.Request) {
+		s.handleJSON(w, r, func() interface{} {
+			return tracetest.NewJoinTraceRequest()
+		}, func(ctx context.Context, req interface{}) (interface{}, error) {
+			return s.doJoinTrace(ctx, req.(*tracetest.JoinTraceRequest))
+		})
+	})
+	mux.HandleFunc("/create_traces", s.eHandler.GenerateTraces)
+
+	listener, err := net.Listen("tcp", s.HostPortHTTP)
+	if err != nil {
+		return err
+	}
+	s.listener = listener
+	s.HostPortHTTP = listener.Addr().String()
+
+	var started sync.WaitGroup
+	started.Add(1)
+	go func() {
+		started.Done()
+		http.Serve(listener, mux)
+	}()
+	started.Wait()
+	log.Printf("Started http server at %s\n", s.HostPortHTTP)
+	return nil
+}
+
+// URL returns URL of the HTTP server
+func (s *Server) URL() string {
+	return fmt.Sprintf("http://%s/", s.HostPortHTTP)
+}
+
+// Close stops the server
+func (s *Server) Close() error {
+	return s.listener.Close()
+}
+
+// GetPortHTTP returns the network port the server listens to.
+func (s *Server) GetPortHTTP() string {
+	hostPort := s.HostPortHTTP
+	hostPortSplit := strings.Split(hostPort, ":")
+	port := hostPortSplit[len(hostPortSplit)-1]
+	return port
+}
+
+// GetPortTChannel returns the actual port the server listens to
+func (s *Server) GetPortTChannel() string {
+	hostPortSplit := strings.Split(s.HostPortTChannel, ":")
+	port := hostPortSplit[len(hostPortSplit)-1]
+	return port
+}
+
+func (s *Server) handleJSON(
+	w http.ResponseWriter,
+	r *http.Request,
+	newReq func() interface{},
+	handle func(ctx context.Context, req interface{}) (interface{}, error),
+) {
+	spanCtx, err := s.Tracer.Extract(opentracing.HTTPHeaders, opentracing.HTTPHeadersCarrier(r.Header))
+	if err != nil && err != opentracing.ErrSpanContextNotFound {
+		http.Error(w, fmt.Sprintf("Cannot read request body: %+v", err), http.StatusBadRequest)
+		return
+	}
+	span := s.Tracer.StartSpan("post", ext.RPCServerOption(spanCtx))
+	ctx := opentracing.ContextWithSpan(context.Background(), span)
+	defer span.Finish()
+
+	body, err := ioutil.ReadAll(r.Body)
+	if err != nil {
+		http.Error(w, fmt.Sprintf("Cannot read request body: %+v", err), http.StatusInternalServerError)
+		return
+	}
+	log.Printf("Server request: %s", string(body))
+	req := newReq()
+	if err := json.Unmarshal(body, req); err != nil {
+		http.Error(w, fmt.Sprintf("Cannot parse request JSON: %+v. body=[%s]", err, string(body)), http.StatusBadRequest)
+		return
+	}
+	resp, err := handle(ctx, req)
+	if err != nil {
+		log.Printf("Handle error: %s", err.Error())
+		http.Error(w, fmt.Sprintf("Execution error: %+v", err), http.StatusInternalServerError)
+		return
+	}
+	json, err := json.Marshal(resp)
+	if err != nil {
+		http.Error(w, fmt.Sprintf("Cannot marshall response to JSON: %+v", err), http.StatusInternalServerError)
+		return
+	}
+	log.Printf("Server response: %s", string(json))
+	w.Header().Add("Content-Type", "application/json")
+	if _, err := w.Write(json); err != nil {
+		return
+	}
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/crossdock/server/server_test.go

@@ -0,0 +1,87 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package server
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/opentracing/opentracing-go"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"golang.org/x/net/context"
+
+	"github.com/uber/jaeger-client-go"
+	"github.com/uber/jaeger-client-go/crossdock/common"
+	"github.com/uber/jaeger-client-go/crossdock/log"
+	"github.com/uber/jaeger-client-go/crossdock/thrift/tracetest"
+)
+
+func TestServerJSON(t *testing.T) {
+	tracer, tCloser := jaeger.NewTracer(
+		"crossdock",
+		jaeger.NewConstSampler(false),
+		jaeger.NewNullReporter())
+	defer tCloser.Close()
+
+	s := &Server{HostPortHTTP: "127.0.0.1:0", HostPortTChannel: "127.0.0.1:0", Tracer: tracer}
+	err := s.Start()
+	require.NoError(t, err)
+	defer s.Close()
+
+	req := tracetest.NewStartTraceRequest()
+	req.Sampled = true
+	req.Baggage = "Zoidberg"
+	req.Downstream = &tracetest.Downstream{
+		ServiceName: "go",
+		Host:        "localhost",
+		Port:        s.GetPortHTTP(),
+		Transport:   tracetest.Transport_HTTP,
+		Downstream: &tracetest.Downstream{
+			ServiceName: "go",
+			Host:        "localhost",
+			Port:        s.GetPortTChannel(),
+			Transport:   tracetest.Transport_TCHANNEL,
+		},
+	}
+
+	url := fmt.Sprintf("http://%s/start_trace", s.HostPortHTTP)
+	result, err := common.PostJSON(context.Background(), url, req)
+
+	require.NoError(t, err)
+	log.Printf("response=%+v", &result)
+}
+
+func TestObserveSpan(t *testing.T) {
+	tracer, tCloser := jaeger.NewTracer(
+		"crossdock",
+		jaeger.NewConstSampler(true),
+		jaeger.NewNullReporter())
+	defer tCloser.Close()
+
+	_, err := observeSpan(context.Background(), tracer)
+	assert.Error(t, err)
+
+	span := tracer.StartSpan("hi")
+	span.SetBaggageItem(BaggageKey, "xyz")
+	ctx := opentracing.ContextWithSpan(context.Background(), span)
+
+	s, err := observeSpan(ctx, tracer)
+	assert.NoError(t, err)
+	assert.True(t, s.Sampled)
+	traceID := span.Context().(jaeger.SpanContext).TraceID().String()
+	assert.Equal(t, traceID, s.TraceId)
+	assert.Equal(t, "xyz", s.Baggage)
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/crossdock/server/tchannel.go

@@ -0,0 +1,88 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package server
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/opentracing/opentracing-go"
+	"github.com/uber/tchannel-go"
+	"github.com/uber/tchannel-go/thrift"
+	"golang.org/x/net/context"
+
+	"github.com/uber/jaeger-client-go/crossdock/log"
+	"github.com/uber/jaeger-client-go/crossdock/thrift/tracetest"
+)
+
+func (s *Server) startTChannelServer(tracer opentracing.Tracer) error {
+	channelOpts := &tchannel.ChannelOptions{
+		Tracer: tracer,
+	}
+	ch, err := tchannel.NewChannel("go", channelOpts)
+	if err != nil {
+		return err
+	}
+	server := thrift.NewServer(ch)
+
+	s.channel = ch
+
+	handler := tracetest.NewTChanTracedServiceServer(s)
+	server.Register(handler)
+
+	if err := ch.ListenAndServe(s.HostPortTChannel); err != nil {
+		return err
+	}
+	s.HostPortTChannel = ch.PeerInfo().HostPort
+	log.Printf("Started tchannel server at %s\n", s.HostPortTChannel)
+	return nil
+}
+
+// StartTrace implements StartTrace() of TChanTracedService
+func (s *Server) StartTrace(ctx thrift.Context, request *tracetest.StartTraceRequest) (*tracetest.TraceResponse, error) {
+	return nil, errCannotStartInTChannel
+}
+
+// JoinTrace implements JoinTrace() of TChanTracedService
+func (s *Server) JoinTrace(ctx thrift.Context, request *tracetest.JoinTraceRequest) (*tracetest.TraceResponse, error) {
+	log.Printf("tchannel server handling JoinTrace")
+	return s.prepareResponse(ctx, request.ServerRole, request.Downstream)
+}
+
+func (s *Server) callDownstreamTChannel(ctx context.Context, target *tracetest.Downstream) (*tracetest.TraceResponse, error) {
+	req := &tracetest.JoinTraceRequest{
+		ServerRole: target.ServerRole,
+		Downstream: target.Downstream,
+	}
+
+	hostPort := fmt.Sprintf("%s:%s", target.Host, target.Port)
+	log.Printf("calling downstream '%s' over tchannel:%s", target.ServiceName, hostPort)
+
+	channelOpts := &tchannel.ChannelOptions{
+		Tracer: s.Tracer,
+	}
+	ch, err := tchannel.NewChannel("tchannel-client", channelOpts)
+	if err != nil {
+		return nil, err
+	}
+
+	opts := &thrift.ClientOptions{HostPort: hostPort}
+	thriftClient := thrift.NewClient(ch, target.ServiceName, opts)
+
+	client := tracetest.NewTChanTracedServiceClient(thriftClient)
+	ctx, cx := context.WithTimeout(ctx, time.Second)
+	defer cx()
+	return client.JoinTrace(thrift.Wrap(ctx), req)
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/crossdock/server/trace.go

@@ -0,0 +1,101 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package server
+
+import (
+	"fmt"
+
+	"github.com/opentracing/opentracing-go"
+	"github.com/opentracing/opentracing-go/ext"
+	"golang.org/x/net/context"
+
+	"github.com/uber/jaeger-client-go"
+	"github.com/uber/jaeger-client-go/crossdock/common"
+	"github.com/uber/jaeger-client-go/crossdock/log"
+	"github.com/uber/jaeger-client-go/crossdock/thrift/tracetest"
+)
+
+func (s *Server) doStartTrace(req *tracetest.StartTraceRequest) (*tracetest.TraceResponse, error) {
+	span := s.Tracer.StartSpan(req.ServerRole)
+	if req.Sampled {
+		ext.SamplingPriority.Set(span, 1)
+	}
+	span.SetBaggageItem(BaggageKey, req.Baggage)
+	defer span.Finish()
+
+	ctx := opentracing.ContextWithSpan(context.Background(), span)
+
+	return s.prepareResponse(ctx, req.ServerRole, req.Downstream)
+}
+
+func (s *Server) doJoinTrace(ctx context.Context, req *tracetest.JoinTraceRequest) (*tracetest.TraceResponse, error) {
+	return s.prepareResponse(ctx, req.ServerRole, req.Downstream)
+}
+
+func (s *Server) prepareResponse(ctx context.Context, role string, reqDwn *tracetest.Downstream) (*tracetest.TraceResponse, error) {
+	observedSpan, err := observeSpan(ctx, s.Tracer)
+	if err != nil {
+		return nil, err
+	}
+
+	resp := tracetest.NewTraceResponse()
+	resp.Span = observedSpan
+
+	if reqDwn != nil {
+		downstreamResp, err := s.callDownstream(ctx, role, reqDwn)
+		if err != nil {
+			return nil, err
+		}
+		resp.Downstream = downstreamResp
+	}
+
+	return resp, nil
+}
+
+func (s *Server) callDownstream(ctx context.Context, role string, downstream *tracetest.Downstream) (*tracetest.TraceResponse, error) {
+	switch downstream.Transport {
+	case tracetest.Transport_HTTP:
+		return s.callDownstreamHTTP(ctx, downstream)
+	case tracetest.Transport_TCHANNEL:
+		return s.callDownstreamTChannel(ctx, downstream)
+	case tracetest.Transport_DUMMY:
+		return &tracetest.TraceResponse{NotImplementedError: "DUMMY transport not implemented"}, nil
+	default:
+		return nil, errUnrecognizedProtocol
+	}
+}
+
+func (s *Server) callDownstreamHTTP(ctx context.Context, target *tracetest.Downstream) (*tracetest.TraceResponse, error) {
+	req := &tracetest.JoinTraceRequest{
+		ServerRole: target.ServerRole,
+		Downstream: target.Downstream,
+	}
+	url := fmt.Sprintf("http://%s:%s/join_trace", target.Host, target.Port)
+	log.Printf("Calling downstream service '%s' at %s", target.ServiceName, url)
+	return common.PostJSON(ctx, url, req)
+}
+
+func observeSpan(ctx context.Context, tracer opentracing.Tracer) (*tracetest.ObservedSpan, error) {
+	span := opentracing.SpanFromContext(ctx)
+	if span == nil {
+		return nil, errNoSpanObserved
+	}
+	sc := span.Context().(jaeger.SpanContext)
+	observedSpan := tracetest.NewObservedSpan()
+	observedSpan.TraceId = sc.TraceID().String()
+	observedSpan.Sampled = sc.IsSampled()
+	observedSpan.Baggage = span.BaggageItem(BaggageKey)
+	return observedSpan, nil
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/crossdock/thrift/tracetest/constants.go

@@ -0,0 +1,18 @@
+// Autogenerated by Thrift Compiler (0.9.3)
+// DO NOT EDIT UNLESS YOU ARE SURE THAT YOU KNOW WHAT YOU ARE DOING
+
+package tracetest
+
+import (
+	"bytes"
+	"fmt"
+	"github.com/apache/thrift/lib/go/thrift"
+)
+
+// (needed to ensure safety because of naive import list construction.)
+var _ = thrift.ZERO
+var _ = fmt.Printf
+var _ = bytes.Equal
+
+func init() {
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/crossdock/thrift/tracetest/tchan-tracetest.go

@@ -0,0 +1,137 @@
+// @generated Code generated by thrift-gen. Do not modify.
+
+// Package tracetest is generated code used to make or handle TChannel calls using Thrift.
+package tracetest
+
+import (
+	"fmt"
+
+	athrift "github.com/apache/thrift/lib/go/thrift"
+	"github.com/uber/tchannel-go/thrift"
+)
+
+// Interfaces for the service and client for the services defined in the IDL.
+
+// TChanTracedService is the interface that defines the server handler and client interface.
+type TChanTracedService interface {
+	JoinTrace(ctx thrift.Context, request *JoinTraceRequest) (*TraceResponse, error)
+	StartTrace(ctx thrift.Context, request *StartTraceRequest) (*TraceResponse, error)
+}
+
+// Implementation of a client and service handler.
+
+type tchanTracedServiceClient struct {
+	thriftService string
+	client        thrift.TChanClient
+}
+
+func NewTChanTracedServiceInheritedClient(thriftService string, client thrift.TChanClient) *tchanTracedServiceClient {
+	return &tchanTracedServiceClient{
+		thriftService,
+		client,
+	}
+}
+
+// NewTChanTracedServiceClient creates a client that can be used to make remote calls.
+func NewTChanTracedServiceClient(client thrift.TChanClient) TChanTracedService {
+	return NewTChanTracedServiceInheritedClient("TracedService", client)
+}
+
+func (c *tchanTracedServiceClient) JoinTrace(ctx thrift.Context, request *JoinTraceRequest) (*TraceResponse, error) {
+	var resp TracedServiceJoinTraceResult
+	args := TracedServiceJoinTraceArgs{
+		Request: request,
+	}
+	success, err := c.client.Call(ctx, c.thriftService, "joinTrace", &args, &resp)
+	if err == nil && !success {
+	}
+
+	return resp.GetSuccess(), err
+}
+
+func (c *tchanTracedServiceClient) StartTrace(ctx thrift.Context, request *StartTraceRequest) (*TraceResponse, error) {
+	var resp TracedServiceStartTraceResult
+	args := TracedServiceStartTraceArgs{
+		Request: request,
+	}
+	success, err := c.client.Call(ctx, c.thriftService, "startTrace", &args, &resp)
+	if err == nil && !success {
+	}
+
+	return resp.GetSuccess(), err
+}
+
+type tchanTracedServiceServer struct {
+	handler TChanTracedService
+}
+
+// NewTChanTracedServiceServer wraps a handler for TChanTracedService so it can be
+// registered with a thrift.Server.
+func NewTChanTracedServiceServer(handler TChanTracedService) thrift.TChanServer {
+	return &tchanTracedServiceServer{
+		handler,
+	}
+}
+
+func (s *tchanTracedServiceServer) Service() string {
+	return "TracedService"
+}
+
+func (s *tchanTracedServiceServer) Methods() []string {
+	return []string{
+		"joinTrace",
+		"startTrace",
+	}
+}
+
+func (s *tchanTracedServiceServer) Handle(ctx thrift.Context, methodName string, protocol athrift.TProtocol) (bool, athrift.TStruct, error) {
+	switch methodName {
+	case "joinTrace":
+		return s.handleJoinTrace(ctx, protocol)
+	case "startTrace":
+		return s.handleStartTrace(ctx, protocol)
+
+	default:
+		return false, nil, fmt.Errorf("method %v not found in service %v", methodName, s.Service())
+	}
+}
+
+func (s *tchanTracedServiceServer) handleJoinTrace(ctx thrift.Context, protocol athrift.TProtocol) (bool, athrift.TStruct, error) {
+	var req TracedServiceJoinTraceArgs
+	var res TracedServiceJoinTraceResult
+
+	if err := req.Read(protocol); err != nil {
+		return false, nil, err
+	}
+
+	r, err :=
+		s.handler.JoinTrace(ctx, req.Request)
+
+	if err != nil {
+		return false, nil, err
+	} else {
+		res.Success = r
+	}
+
+	return err == nil, &res, nil
+}
+
+func (s *tchanTracedServiceServer) handleStartTrace(ctx thrift.Context, protocol athrift.TProtocol) (bool, athrift.TStruct, error) {
+	var req TracedServiceStartTraceArgs
+	var res TracedServiceStartTraceResult
+
+	if err := req.Read(protocol); err != nil {
+		return false, nil, err
+	}
+
+	r, err :=
+		s.handler.StartTrace(ctx, req.Request)
+
+	if err != nil {
+		return false, nil, err
+	} else {
+		res.Success = r
+	}
+
+	return err == nil, &res, nil
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/crossdock/thrift/tracetest/tracedservice.go

@@ -0,0 +1,747 @@
+// Autogenerated by Thrift Compiler (0.9.3)
+// DO NOT EDIT UNLESS YOU ARE SURE THAT YOU KNOW WHAT YOU ARE DOING
+
+package tracetest
+
+import (
+	"bytes"
+	"fmt"
+	"github.com/apache/thrift/lib/go/thrift"
+)
+
+// (needed to ensure safety because of naive import list construction.)
+var _ = thrift.ZERO
+var _ = fmt.Printf
+var _ = bytes.Equal
+
+type TracedService interface {
+	// Parameters:
+	//  - Request
+	StartTrace(request *StartTraceRequest) (r *TraceResponse, err error)
+	// Parameters:
+	//  - Request
+	JoinTrace(request *JoinTraceRequest) (r *TraceResponse, err error)
+}
+
+type TracedServiceClient struct {
+	Transport       thrift.TTransport
+	ProtocolFactory thrift.TProtocolFactory
+	InputProtocol   thrift.TProtocol
+	OutputProtocol  thrift.TProtocol
+	SeqId           int32
+}
+
+func NewTracedServiceClientFactory(t thrift.TTransport, f thrift.TProtocolFactory) *TracedServiceClient {
+	return &TracedServiceClient{Transport: t,
+		ProtocolFactory: f,
+		InputProtocol:   f.GetProtocol(t),
+		OutputProtocol:  f.GetProtocol(t),
+		SeqId:           0,
+	}
+}
+
+func NewTracedServiceClientProtocol(t thrift.TTransport, iprot thrift.TProtocol, oprot thrift.TProtocol) *TracedServiceClient {
+	return &TracedServiceClient{Transport: t,
+		ProtocolFactory: nil,
+		InputProtocol:   iprot,
+		OutputProtocol:  oprot,
+		SeqId:           0,
+	}
+}
+
+// Parameters:
+//  - Request
+func (p *TracedServiceClient) StartTrace(request *StartTraceRequest) (r *TraceResponse, err error) {
+	if err = p.sendStartTrace(request); err != nil {
+		return
+	}
+	return p.recvStartTrace()
+}
+
+func (p *TracedServiceClient) sendStartTrace(request *StartTraceRequest) (err error) {
+	oprot := p.OutputProtocol
+	if oprot == nil {
+		oprot = p.ProtocolFactory.GetProtocol(p.Transport)
+		p.OutputProtocol = oprot
+	}
+	p.SeqId++
+	if err = oprot.WriteMessageBegin("startTrace", thrift.CALL, p.SeqId); err != nil {
+		return
+	}
+	args := TracedServiceStartTraceArgs{
+		Request: request,
+	}
+	if err = args.Write(oprot); err != nil {
+		return
+	}
+	if err = oprot.WriteMessageEnd(); err != nil {
+		return
+	}
+	return oprot.Flush()
+}
+
+func (p *TracedServiceClient) recvStartTrace() (value *TraceResponse, err error) {
+	iprot := p.InputProtocol
+	if iprot == nil {
+		iprot = p.ProtocolFactory.GetProtocol(p.Transport)
+		p.InputProtocol = iprot
+	}
+	method, mTypeId, seqId, err := iprot.ReadMessageBegin()
+	if err != nil {
+		return
+	}
+	if method != "startTrace" {
+		err = thrift.NewTApplicationException(thrift.WRONG_METHOD_NAME, "startTrace failed: wrong method name")
+		return
+	}
+	if p.SeqId != seqId {
+		err = thrift.NewTApplicationException(thrift.BAD_SEQUENCE_ID, "startTrace failed: out of sequence response")
+		return
+	}
+	if mTypeId == thrift.EXCEPTION {
+		error0 := thrift.NewTApplicationException(thrift.UNKNOWN_APPLICATION_EXCEPTION, "Unknown Exception")
+		var error1 error
+		error1, err = error0.Read(iprot)
+		if err != nil {
+			return
+		}
+		if err = iprot.ReadMessageEnd(); err != nil {
+			return
+		}
+		err = error1
+		return
+	}
+	if mTypeId != thrift.REPLY {
+		err = thrift.NewTApplicationException(thrift.INVALID_MESSAGE_TYPE_EXCEPTION, "startTrace failed: invalid message type")
+		return
+	}
+	result := TracedServiceStartTraceResult{}
+	if err = result.Read(iprot); err != nil {
+		return
+	}
+	if err = iprot.ReadMessageEnd(); err != nil {
+		return
+	}
+	value = result.GetSuccess()
+	return
+}
+
+// Parameters:
+//  - Request
+func (p *TracedServiceClient) JoinTrace(request *JoinTraceRequest) (r *TraceResponse, err error) {
+	if err = p.sendJoinTrace(request); err != nil {
+		return
+	}
+	return p.recvJoinTrace()
+}
+
+func (p *TracedServiceClient) sendJoinTrace(request *JoinTraceRequest) (err error) {
+	oprot := p.OutputProtocol
+	if oprot == nil {
+		oprot = p.ProtocolFactory.GetProtocol(p.Transport)
+		p.OutputProtocol = oprot
+	}
+	p.SeqId++
+	if err = oprot.WriteMessageBegin("joinTrace", thrift.CALL, p.SeqId); err != nil {
+		return
+	}
+	args := TracedServiceJoinTraceArgs{
+		Request: request,
+	}
+	if err = args.Write(oprot); err != nil {
+		return
+	}
+	if err = oprot.WriteMessageEnd(); err != nil {
+		return
+	}
+	return oprot.Flush()
+}
+
+func (p *TracedServiceClient) recvJoinTrace() (value *TraceResponse, err error) {
+	iprot := p.InputProtocol
+	if iprot == nil {
+		iprot = p.ProtocolFactory.GetProtocol(p.Transport)
+		p.InputProtocol = iprot
+	}
+	method, mTypeId, seqId, err := iprot.ReadMessageBegin()
+	if err != nil {
+		return
+	}
+	if method != "joinTrace" {
+		err = thrift.NewTApplicationException(thrift.WRONG_METHOD_NAME, "joinTrace failed: wrong method name")
+		return
+	}
+	if p.SeqId != seqId {
+		err = thrift.NewTApplicationException(thrift.BAD_SEQUENCE_ID, "joinTrace failed: out of sequence response")
+		return
+	}
+	if mTypeId == thrift.EXCEPTION {
+		error2 := thrift.NewTApplicationException(thrift.UNKNOWN_APPLICATION_EXCEPTION, "Unknown Exception")
+		var error3 error
+		error3, err = error2.Read(iprot)
+		if err != nil {
+			return
+		}
+		if err = iprot.ReadMessageEnd(); err != nil {
+			return
+		}
+		err = error3
+		return
+	}
+	if mTypeId != thrift.REPLY {
+		err = thrift.NewTApplicationException(thrift.INVALID_MESSAGE_TYPE_EXCEPTION, "joinTrace failed: invalid message type")
+		return
+	}
+	result := TracedServiceJoinTraceResult{}
+	if err = result.Read(iprot); err != nil {
+		return
+	}
+	if err = iprot.ReadMessageEnd(); err != nil {
+		return
+	}
+	value = result.GetSuccess()
+	return
+}
+
+type TracedServiceProcessor struct {
+	processorMap map[string]thrift.TProcessorFunction
+	handler      TracedService
+}
+
+func (p *TracedServiceProcessor) AddToProcessorMap(key string, processor thrift.TProcessorFunction) {
+	p.processorMap[key] = processor
+}
+
+func (p *TracedServiceProcessor) GetProcessorFunction(key string) (processor thrift.TProcessorFunction, ok bool) {
+	processor, ok = p.processorMap[key]
+	return processor, ok
+}
+
+func (p *TracedServiceProcessor) ProcessorMap() map[string]thrift.TProcessorFunction {
+	return p.processorMap
+}
+
+func NewTracedServiceProcessor(handler TracedService) *TracedServiceProcessor {
+
+	self4 := &TracedServiceProcessor{handler: handler, processorMap: make(map[string]thrift.TProcessorFunction)}
+	self4.processorMap["startTrace"] = &tracedServiceProcessorStartTrace{handler: handler}
+	self4.processorMap["joinTrace"] = &tracedServiceProcessorJoinTrace{handler: handler}
+	return self4
+}
+
+func (p *TracedServiceProcessor) Process(iprot, oprot thrift.TProtocol) (success bool, err thrift.TException) {
+	name, _, seqId, err := iprot.ReadMessageBegin()
+	if err != nil {
+		return false, err
+	}
+	if processor, ok := p.GetProcessorFunction(name); ok {
+		return processor.Process(seqId, iprot, oprot)
+	}
+	iprot.Skip(thrift.STRUCT)
+	iprot.ReadMessageEnd()
+	x5 := thrift.NewTApplicationException(thrift.UNKNOWN_METHOD, "Unknown function "+name)
+	oprot.WriteMessageBegin(name, thrift.EXCEPTION, seqId)
+	x5.Write(oprot)
+	oprot.WriteMessageEnd()
+	oprot.Flush()
+	return false, x5
+
+}
+
+type tracedServiceProcessorStartTrace struct {
+	handler TracedService
+}
+
+func (p *tracedServiceProcessorStartTrace) Process(seqId int32, iprot, oprot thrift.TProtocol) (success bool, err thrift.TException) {
+	args := TracedServiceStartTraceArgs{}
+	if err = args.Read(iprot); err != nil {
+		iprot.ReadMessageEnd()
+		x := thrift.NewTApplicationException(thrift.PROTOCOL_ERROR, err.Error())
+		oprot.WriteMessageBegin("startTrace", thrift.EXCEPTION, seqId)
+		x.Write(oprot)
+		oprot.WriteMessageEnd()
+		oprot.Flush()
+		return false, err
+	}
+
+	iprot.ReadMessageEnd()
+	result := TracedServiceStartTraceResult{}
+	var retval *TraceResponse
+	var err2 error
+	if retval, err2 = p.handler.StartTrace(args.Request); err2 != nil {
+		x := thrift.NewTApplicationException(thrift.INTERNAL_ERROR, "Internal error processing startTrace: "+err2.Error())
+		oprot.WriteMessageBegin("startTrace", thrift.EXCEPTION, seqId)
+		x.Write(oprot)
+		oprot.WriteMessageEnd()
+		oprot.Flush()
+		return true, err2
+	} else {
+		result.Success = retval
+	}
+	if err2 = oprot.WriteMessageBegin("startTrace", thrift.REPLY, seqId); err2 != nil {
+		err = err2
+	}
+	if err2 = result.Write(oprot); err == nil && err2 != nil {
+		err = err2
+	}
+	if err2 = oprot.WriteMessageEnd(); err == nil && err2 != nil {
+		err = err2
+	}
+	if err2 = oprot.Flush(); err == nil && err2 != nil {
+		err = err2
+	}
+	if err != nil {
+		return
+	}
+	return true, err
+}
+
+type tracedServiceProcessorJoinTrace struct {
+	handler TracedService
+}
+
+func (p *tracedServiceProcessorJoinTrace) Process(seqId int32, iprot, oprot thrift.TProtocol) (success bool, err thrift.TException) {
+	args := TracedServiceJoinTraceArgs{}
+	if err = args.Read(iprot); err != nil {
+		iprot.ReadMessageEnd()
+		x := thrift.NewTApplicationException(thrift.PROTOCOL_ERROR, err.Error())
+		oprot.WriteMessageBegin("joinTrace", thrift.EXCEPTION, seqId)
+		x.Write(oprot)
+		oprot.WriteMessageEnd()
+		oprot.Flush()
+		return false, err
+	}
+
+	iprot.ReadMessageEnd()
+	result := TracedServiceJoinTraceResult{}
+	var retval *TraceResponse
+	var err2 error
+	if retval, err2 = p.handler.JoinTrace(args.Request); err2 != nil {
+		x := thrift.NewTApplicationException(thrift.INTERNAL_ERROR, "Internal error processing joinTrace: "+err2.Error())
+		oprot.WriteMessageBegin("joinTrace", thrift.EXCEPTION, seqId)
+		x.Write(oprot)
+		oprot.WriteMessageEnd()
+		oprot.Flush()
+		return true, err2
+	} else {
+		result.Success = retval
+	}
+	if err2 = oprot.WriteMessageBegin("joinTrace", thrift.REPLY, seqId); err2 != nil {
+		err = err2
+	}
+	if err2 = result.Write(oprot); err == nil && err2 != nil {
+		err = err2
+	}
+	if err2 = oprot.WriteMessageEnd(); err == nil && err2 != nil {
+		err = err2
+	}
+	if err2 = oprot.Flush(); err == nil && err2 != nil {
+		err = err2
+	}
+	if err != nil {
+		return
+	}
+	return true, err
+}
+
+// HELPER FUNCTIONS AND STRUCTURES
+
+// Attributes:
+//  - Request
+type TracedServiceStartTraceArgs struct {
+	Request *StartTraceRequest `thrift:"request,1" json:"request"`
+}
+
+func NewTracedServiceStartTraceArgs() *TracedServiceStartTraceArgs {
+	return &TracedServiceStartTraceArgs{}
+}
+
+var TracedServiceStartTraceArgs_Request_DEFAULT *StartTraceRequest
+
+func (p *TracedServiceStartTraceArgs) GetRequest() *StartTraceRequest {
+	if !p.IsSetRequest() {
+		return TracedServiceStartTraceArgs_Request_DEFAULT
+	}
+	return p.Request
+}
+func (p *TracedServiceStartTraceArgs) IsSetRequest() bool {
+	return p.Request != nil
+}
+
+func (p *TracedServiceStartTraceArgs) Read(iprot thrift.TProtocol) error {
+	if _, err := iprot.ReadStructBegin(); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T read error: ", p), err)
+	}
+
+	for {
+		_, fieldTypeId, fieldId, err := iprot.ReadFieldBegin()
+		if err != nil {
+			return thrift.PrependError(fmt.Sprintf("%T field %d read error: ", p, fieldId), err)
+		}
+		if fieldTypeId == thrift.STOP {
+			break
+		}
+		switch fieldId {
+		case 1:
+			if err := p.readField1(iprot); err != nil {
+				return err
+			}
+		default:
+			if err := iprot.Skip(fieldTypeId); err != nil {
+				return err
+			}
+		}
+		if err := iprot.ReadFieldEnd(); err != nil {
+			return err
+		}
+	}
+	if err := iprot.ReadStructEnd(); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T read struct end error: ", p), err)
+	}
+	return nil
+}
+
+func (p *TracedServiceStartTraceArgs) readField1(iprot thrift.TProtocol) error {
+	p.Request = &StartTraceRequest{}
+	if err := p.Request.Read(iprot); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T error reading struct: ", p.Request), err)
+	}
+	return nil
+}
+
+func (p *TracedServiceStartTraceArgs) Write(oprot thrift.TProtocol) error {
+	if err := oprot.WriteStructBegin("startTrace_args"); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T write struct begin error: ", p), err)
+	}
+	if err := p.writeField1(oprot); err != nil {
+		return err
+	}
+	if err := oprot.WriteFieldStop(); err != nil {
+		return thrift.PrependError("write field stop error: ", err)
+	}
+	if err := oprot.WriteStructEnd(); err != nil {
+		return thrift.PrependError("write struct stop error: ", err)
+	}
+	return nil
+}
+
+func (p *TracedServiceStartTraceArgs) writeField1(oprot thrift.TProtocol) (err error) {
+	if err := oprot.WriteFieldBegin("request", thrift.STRUCT, 1); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T write field begin error 1:request: ", p), err)
+	}
+	if err := p.Request.Write(oprot); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T error writing struct: ", p.Request), err)
+	}
+	if err := oprot.WriteFieldEnd(); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T write field end error 1:request: ", p), err)
+	}
+	return err
+}
+
+func (p *TracedServiceStartTraceArgs) String() string {
+	if p == nil {
+		return "<nil>"
+	}
+	return fmt.Sprintf("TracedServiceStartTraceArgs(%+v)", *p)
+}
+
+// Attributes:
+//  - Success
+type TracedServiceStartTraceResult struct {
+	Success *TraceResponse `thrift:"success,0" json:"success,omitempty"`
+}
+
+func NewTracedServiceStartTraceResult() *TracedServiceStartTraceResult {
+	return &TracedServiceStartTraceResult{}
+}
+
+var TracedServiceStartTraceResult_Success_DEFAULT *TraceResponse
+
+func (p *TracedServiceStartTraceResult) GetSuccess() *TraceResponse {
+	if !p.IsSetSuccess() {
+		return TracedServiceStartTraceResult_Success_DEFAULT
+	}
+	return p.Success
+}
+func (p *TracedServiceStartTraceResult) IsSetSuccess() bool {
+	return p.Success != nil
+}
+
+func (p *TracedServiceStartTraceResult) Read(iprot thrift.TProtocol) error {
+	if _, err := iprot.ReadStructBegin(); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T read error: ", p), err)
+	}
+
+	for {
+		_, fieldTypeId, fieldId, err := iprot.ReadFieldBegin()
+		if err != nil {
+			return thrift.PrependError(fmt.Sprintf("%T field %d read error: ", p, fieldId), err)
+		}
+		if fieldTypeId == thrift.STOP {
+			break
+		}
+		switch fieldId {
+		case 0:
+			if err := p.readField0(iprot); err != nil {
+				return err
+			}
+		default:
+			if err := iprot.Skip(fieldTypeId); err != nil {
+				return err
+			}
+		}
+		if err := iprot.ReadFieldEnd(); err != nil {
+			return err
+		}
+	}
+	if err := iprot.ReadStructEnd(); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T read struct end error: ", p), err)
+	}
+	return nil
+}
+
+func (p *TracedServiceStartTraceResult) readField0(iprot thrift.TProtocol) error {
+	p.Success = &TraceResponse{}
+	if err := p.Success.Read(iprot); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T error reading struct: ", p.Success), err)
+	}
+	return nil
+}
+
+func (p *TracedServiceStartTraceResult) Write(oprot thrift.TProtocol) error {
+	if err := oprot.WriteStructBegin("startTrace_result"); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T write struct begin error: ", p), err)
+	}
+	if err := p.writeField0(oprot); err != nil {
+		return err
+	}
+	if err := oprot.WriteFieldStop(); err != nil {
+		return thrift.PrependError("write field stop error: ", err)
+	}
+	if err := oprot.WriteStructEnd(); err != nil {
+		return thrift.PrependError("write struct stop error: ", err)
+	}
+	return nil
+}
+
+func (p *TracedServiceStartTraceResult) writeField0(oprot thrift.TProtocol) (err error) {
+	if p.IsSetSuccess() {
+		if err := oprot.WriteFieldBegin("success", thrift.STRUCT, 0); err != nil {
+			return thrift.PrependError(fmt.Sprintf("%T write field begin error 0:success: ", p), err)
+		}
+		if err := p.Success.Write(oprot); err != nil {
+			return thrift.PrependError(fmt.Sprintf("%T error writing struct: ", p.Success), err)
+		}
+		if err := oprot.WriteFieldEnd(); err != nil {
+			return thrift.PrependError(fmt.Sprintf("%T write field end error 0:success: ", p), err)
+		}
+	}
+	return err
+}
+
+func (p *TracedServiceStartTraceResult) String() string {
+	if p == nil {
+		return "<nil>"
+	}
+	return fmt.Sprintf("TracedServiceStartTraceResult(%+v)", *p)
+}
+
+// Attributes:
+//  - Request
+type TracedServiceJoinTraceArgs struct {
+	Request *JoinTraceRequest `thrift:"request,1" json:"request"`
+}
+
+func NewTracedServiceJoinTraceArgs() *TracedServiceJoinTraceArgs {
+	return &TracedServiceJoinTraceArgs{}
+}
+
+var TracedServiceJoinTraceArgs_Request_DEFAULT *JoinTraceRequest
+
+func (p *TracedServiceJoinTraceArgs) GetRequest() *JoinTraceRequest {
+	if !p.IsSetRequest() {
+		return TracedServiceJoinTraceArgs_Request_DEFAULT
+	}
+	return p.Request
+}
+func (p *TracedServiceJoinTraceArgs) IsSetRequest() bool {
+	return p.Request != nil
+}
+
+func (p *TracedServiceJoinTraceArgs) Read(iprot thrift.TProtocol) error {
+	if _, err := iprot.ReadStructBegin(); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T read error: ", p), err)
+	}
+
+	for {
+		_, fieldTypeId, fieldId, err := iprot.ReadFieldBegin()
+		if err != nil {
+			return thrift.PrependError(fmt.Sprintf("%T field %d read error: ", p, fieldId), err)
+		}
+		if fieldTypeId == thrift.STOP {
+			break
+		}
+		switch fieldId {
+		case 1:
+			if err := p.readField1(iprot); err != nil {
+				return err
+			}
+		default:
+			if err := iprot.Skip(fieldTypeId); err != nil {
+				return err
+			}
+		}
+		if err := iprot.ReadFieldEnd(); err != nil {
+			return err
+		}
+	}
+	if err := iprot.ReadStructEnd(); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T read struct end error: ", p), err)
+	}
+	return nil
+}
+
+func (p *TracedServiceJoinTraceArgs) readField1(iprot thrift.TProtocol) error {
+	p.Request = &JoinTraceRequest{}
+	if err := p.Request.Read(iprot); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T error reading struct: ", p.Request), err)
+	}
+	return nil
+}
+
+func (p *TracedServiceJoinTraceArgs) Write(oprot thrift.TProtocol) error {
+	if err := oprot.WriteStructBegin("joinTrace_args"); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T write struct begin error: ", p), err)
+	}
+	if err := p.writeField1(oprot); err != nil {
+		return err
+	}
+	if err := oprot.WriteFieldStop(); err != nil {
+		return thrift.PrependError("write field stop error: ", err)
+	}
+	if err := oprot.WriteStructEnd(); err != nil {
+		return thrift.PrependError("write struct stop error: ", err)
+	}
+	return nil
+}
+
+func (p *TracedServiceJoinTraceArgs) writeField1(oprot thrift.TProtocol) (err error) {
+	if err := oprot.WriteFieldBegin("request", thrift.STRUCT, 1); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T write field begin error 1:request: ", p), err)
+	}
+	if err := p.Request.Write(oprot); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T error writing struct: ", p.Request), err)
+	}
+	if err := oprot.WriteFieldEnd(); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T write field end error 1:request: ", p), err)
+	}
+	return err
+}
+
+func (p *TracedServiceJoinTraceArgs) String() string {
+	if p == nil {
+		return "<nil>"
+	}
+	return fmt.Sprintf("TracedServiceJoinTraceArgs(%+v)", *p)
+}
+
+// Attributes:
+//  - Success
+type TracedServiceJoinTraceResult struct {
+	Success *TraceResponse `thrift:"success,0" json:"success,omitempty"`
+}
+
+func NewTracedServiceJoinTraceResult() *TracedServiceJoinTraceResult {
+	return &TracedServiceJoinTraceResult{}
+}
+
+var TracedServiceJoinTraceResult_Success_DEFAULT *TraceResponse
+
+func (p *TracedServiceJoinTraceResult) GetSuccess() *TraceResponse {
+	if !p.IsSetSuccess() {
+		return TracedServiceJoinTraceResult_Success_DEFAULT
+	}
+	return p.Success
+}
+func (p *TracedServiceJoinTraceResult) IsSetSuccess() bool {
+	return p.Success != nil
+}
+
+func (p *TracedServiceJoinTraceResult) Read(iprot thrift.TProtocol) error {
+	if _, err := iprot.ReadStructBegin(); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T read error: ", p), err)
+	}
+
+	for {
+		_, fieldTypeId, fieldId, err := iprot.ReadFieldBegin()
+		if err != nil {
+			return thrift.PrependError(fmt.Sprintf("%T field %d read error: ", p, fieldId), err)
+		}
+		if fieldTypeId == thrift.STOP {
+			break
+		}
+		switch fieldId {
+		case 0:
+			if err := p.readField0(iprot); err != nil {
+				return err
+			}
+		default:
+			if err := iprot.Skip(fieldTypeId); err != nil {
+				return err
+			}
+		}
+		if err := iprot.ReadFieldEnd(); err != nil {
+			return err
+		}
+	}
+	if err := iprot.ReadStructEnd(); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T read struct end error: ", p), err)
+	}
+	return nil
+}
+
+func (p *TracedServiceJoinTraceResult) readField0(iprot thrift.TProtocol) error {
+	p.Success = &TraceResponse{}
+	if err := p.Success.Read(iprot); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T error reading struct: ", p.Success), err)
+	}
+	return nil
+}
+
+func (p *TracedServiceJoinTraceResult) Write(oprot thrift.TProtocol) error {
+	if err := oprot.WriteStructBegin("joinTrace_result"); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T write struct begin error: ", p), err)
+	}
+	if err := p.writeField0(oprot); err != nil {
+		return err
+	}
+	if err := oprot.WriteFieldStop(); err != nil {
+		return thrift.PrependError("write field stop error: ", err)
+	}
+	if err := oprot.WriteStructEnd(); err != nil {
+		return thrift.PrependError("write struct stop error: ", err)
+	}
+	return nil
+}
+
+func (p *TracedServiceJoinTraceResult) writeField0(oprot thrift.TProtocol) (err error) {
+	if p.IsSetSuccess() {
+		if err := oprot.WriteFieldBegin("success", thrift.STRUCT, 0); err != nil {
+			return thrift.PrependError(fmt.Sprintf("%T write field begin error 0:success: ", p), err)
+		}
+		if err := p.Success.Write(oprot); err != nil {
+			return thrift.PrependError(fmt.Sprintf("%T error writing struct: ", p.Success), err)
+		}
+		if err := oprot.WriteFieldEnd(); err != nil {
+			return thrift.PrependError(fmt.Sprintf("%T write field end error 0:success: ", p), err)
+		}
+	}
+	return err
+}
+
+func (p *TracedServiceJoinTraceResult) String() string {
+	if p == nil {
+		return "<nil>"
+	}
+	return fmt.Sprintf("TracedServiceJoinTraceResult(%+v)", *p)
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/doc.go

@@ -0,0 +1,24 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/*
+Package jaeger implements an OpenTracing (http://opentracing.io) Tracer.
+It is currently using Zipkin-compatible data model and can be directly
+itegrated with Zipkin backend (http://zipkin.io).
+
+For integration instructions please refer to the README:
+
+https://github.com/uber/jaeger-client-go/blob/master/README.md
+*/
+package jaeger

vendor/src/github.com/jaegertracing/jaeger-client-go/glide.lock

@@ -0,0 +1,75 @@
+hash: 4abcf83a509c003112c27a131eafde7d4fa11aeb17decb43ac0746593890ff85
+updated: 2017-08-22T14:21:39.649697305-04:00
+imports:
+- name: github.com/apache/thrift
+  version: b2a4d4ae21c789b689dd162deb819665567f481c
+  subpackages:
+  - lib/go/thrift
+- name: github.com/codahale/hdrhistogram
+  version: f8ad88b59a584afeee9d334eff879b104439117b
+- name: github.com/crossdock/crossdock-go
+  version: 049aabb0122b03bc9bd30cab8f3f91fb60166361
+  subpackages:
+  - assert
+  - require
+- name: github.com/davecgh/go-spew
+  version: adab96458c51a58dc1783b3335dcce5461522e75
+  subpackages:
+  - spew
+- name: github.com/opentracing/opentracing-go
+  version: 1949ddbfd147afd4d964a9f00b24eb291e0e7c38
+  subpackages:
+  - ext
+  - log
+- name: github.com/pmezard/go-difflib
+  version: 792786c7400a136282c1664665ae0a8db921c6c2
+  subpackages:
+  - difflib
+- name: github.com/stretchr/testify
+  version: 69483b4bd14f5845b5a1e55bca19e954e827f1d0
+  subpackages:
+  - assert
+  - require
+  - suite
+- name: github.com/uber-go/atomic
+  version: 0c9e689d64f004564b79d9a663634756df322902
+- name: github.com/uber/jaeger-lib
+  version: 575c678b2873b62aaadd0fa5817a2aeb3155dc4d
+  subpackages:
+  - metrics
+  - metrics/testutils
+- name: github.com/uber/tchannel-go
+  version: a7ad9ecb640b5f10a0395b38d6319175172b3ab2
+  subpackages:
+  - atomic
+  - internal/argreader
+  - relay
+  - thrift
+  - thrift/gen-go/meta
+  - tnet
+  - tos
+  - trace/thrift/gen-go/tcollector
+  - trand
+  - typed
+- name: go.uber.org/atomic
+  version: 4e336646b2ef9fc6e47be8e21594178f98e5ebcf
+- name: go.uber.org/zap
+  version: 9cabc84638b70e564c3dab2766efcb1ded2aac9f
+  subpackages:
+  - buffer
+  - internal/bufferpool
+  - internal/color
+  - internal/exit
+  - internal/multierror
+  - zapcore
+- name: golang.org/x/net
+  version: f5079bd7f6f74e23c4d65efa0f4ce14cbd6a3c0f
+  subpackages:
+  - bpf
+  - context
+  - context/ctxhttp
+  - internal/iana
+  - internal/socket
+  - ipv4
+  - ipv6
+testImports: []

vendor/src/github.com/jaegertracing/jaeger-client-go/glide.yaml

@@ -0,0 +1,34 @@
+package: github.com/uber/jaeger-client-go
+import:
+- package: github.com/apache/thrift
+  version: ">=0.9.3, <0.11.0"
+  subpackages:
+  - lib/go/thrift
+- package: github.com/opentracing/opentracing-go
+  version: ^1
+  subpackages:
+  - ext
+  - log
+- package: golang.org/x/net
+  subpackages:
+  - context
+- package: github.com/uber/tchannel-go
+  version: ^1.1.0
+  subpackages:
+  - atomic
+  - thrift
+  - thrift/gen-go/meta
+  - tnet
+  - trace/thrift/gen-go/tcollector
+  - typed
+- package: github.com/stretchr/testify
+  version: ^1.1.3
+  subpackages:
+  - assert
+  - require
+  - suite
+- package: github.com/crossdock/crossdock-go
+- package: github.com/uber/jaeger-lib
+  version: ^1.0.0
+  subpackages:
+  - metrics

vendor/src/github.com/jaegertracing/jaeger-client-go/header.go

@@ -0,0 +1,64 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package jaeger
+
+// HeadersConfig contains the values for the header keys that Jaeger will use.
+// These values may be either custom or default depending on whether custom
+// values were provided via a configuration.
+type HeadersConfig struct {
+	// JaegerDebugHeader is the name of HTTP header or a TextMap carrier key which,
+	// if found in the carrier, forces the trace to be sampled as "debug" trace.
+	// The value of the header is recorded as the tag on the root span, so that the
+	// trace can be found in the UI using this value as a correlation ID.
+	JaegerDebugHeader string `yaml:"jaegerDebugHeader"`
+
+	// JaegerBaggageHeader is the name of the HTTP header that is used to submit baggage.
+	// It differs from TraceBaggageHeaderPrefix in that it can be used only in cases where
+	// a root span does not exist.
+	JaegerBaggageHeader string `yaml:"jaegerBaggageHeader"`
+
+	// TraceContextHeaderName is the http header name used to propagate tracing context.
+	// This must be in lower-case to avoid mismatches when decoding incoming headers.
+	TraceContextHeaderName string `yaml:"TraceContextHeaderName"`
+
+	// TraceBaggageHeaderPrefix is the prefix for http headers used to propagate baggage.
+	// This must be in lower-case to avoid mismatches when decoding incoming headers.
+	TraceBaggageHeaderPrefix string `yaml:"traceBaggageHeaderPrefix"`
+}
+
+func (c *HeadersConfig) applyDefaults() *HeadersConfig {
+	if c.JaegerBaggageHeader == "" {
+		c.JaegerBaggageHeader = JaegerBaggageHeader
+	}
+	if c.JaegerDebugHeader == "" {
+		c.JaegerDebugHeader = JaegerDebugHeader
+	}
+	if c.TraceBaggageHeaderPrefix == "" {
+		c.TraceBaggageHeaderPrefix = TraceBaggageHeaderPrefix
+	}
+	if c.TraceContextHeaderName == "" {
+		c.TraceContextHeaderName = TraceContextHeaderName
+	}
+	return c
+}
+
+func getDefaultHeadersConfig() *HeadersConfig {
+	return &HeadersConfig{
+		JaegerDebugHeader:        JaegerDebugHeader,
+		JaegerBaggageHeader:      JaegerBaggageHeader,
+		TraceContextHeaderName:   TraceContextHeaderName,
+		TraceBaggageHeaderPrefix: TraceBaggageHeaderPrefix,
+	}
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/header_test.go

@@ -0,0 +1,50 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package jaeger
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestSetDefaultOrCustom(t *testing.T) {
+	assert.Equal(t, (&HeadersConfig{}).applyDefaults(), getDefaultHeadersConfig())
+	assert.Equal(t, (&HeadersConfig{
+		JaegerDebugHeader: "custom-jaeger-debug-header",
+	}).applyDefaults(), &HeadersConfig{
+		JaegerDebugHeader:        "custom-jaeger-debug-header",
+		JaegerBaggageHeader:      JaegerBaggageHeader,
+		TraceContextHeaderName:   TraceContextHeaderName,
+		TraceBaggageHeaderPrefix: TraceBaggageHeaderPrefix,
+	})
+
+	customHeaders := &HeadersConfig{
+		JaegerDebugHeader:        "custom-jaeger-debug-header",
+		JaegerBaggageHeader:      "custom-jaeger-baggage-header",
+		TraceContextHeaderName:   "custom-tracer-state-header-name",
+		TraceBaggageHeaderPrefix: "custom-tracer-baggage-header-prefix",
+	}
+	assert.Equal(t, customHeaders.applyDefaults(), customHeaders)
+}
+
+func TestGetDefaultHeadersConfig(t *testing.T) {
+	assert.Equal(t, getDefaultHeadersConfig(), &HeadersConfig{
+		JaegerDebugHeader:        JaegerDebugHeader,
+		JaegerBaggageHeader:      JaegerBaggageHeader,
+		TraceContextHeaderName:   TraceContextHeaderName,
+		TraceBaggageHeaderPrefix: TraceBaggageHeaderPrefix,
+	})
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/internal/baggage/remote/options.go

@@ -0,0 +1,101 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package remote
+
+import (
+	"time"
+
+	"github.com/uber/jaeger-client-go"
+)
+
+const (
+	defaultMaxValueLength  = 2048
+	defaultRefreshInterval = time.Minute
+	defaultHostPort        = "localhost:5778"
+)
+
+// Option is a function that sets some option on the RestrictionManager
+type Option func(options *options)
+
+// Options is a factory for all available options
+var Options options
+
+type options struct {
+	denyBaggageOnInitializationFailure bool
+	metrics                            *jaeger.Metrics
+	logger                             jaeger.Logger
+	hostPort                           string
+	refreshInterval                    time.Duration
+}
+
+// DenyBaggageOnInitializationFailure creates an Option that determines the startup failure mode of RestrictionManager.
+// If DenyBaggageOnInitializationFailure is true, RestrictionManager will not allow any baggage to be written until baggage
+// restrictions have been retrieved from agent.
+// If DenyBaggageOnInitializationFailure is false, RestrictionManager will allow any baggage to be written until baggage
+// restrictions have been retrieved from agent.
+func (options) DenyBaggageOnInitializationFailure(b bool) Option {
+	return func(o *options) {
+		o.denyBaggageOnInitializationFailure = b
+	}
+}
+
+// Metrics creates an Option that initializes Metrics on the RestrictionManager, which is used to emit statistics.
+func (options) Metrics(m *jaeger.Metrics) Option {
+	return func(o *options) {
+		o.metrics = m
+	}
+}
+
+// Logger creates an Option that sets the logger used by the RestrictionManager.
+func (options) Logger(logger jaeger.Logger) Option {
+	return func(o *options) {
+		o.logger = logger
+	}
+}
+
+// HostPort creates an Option that sets the hostPort of the local agent that contains the baggage restrictions.
+func (options) HostPort(hostPort string) Option {
+	return func(o *options) {
+		o.hostPort = hostPort
+	}
+}
+
+// RefreshInterval creates an Option that sets how often the RestrictionManager will poll local agent for
+// the baggage restrictions.
+func (options) RefreshInterval(refreshInterval time.Duration) Option {
+	return func(o *options) {
+		o.refreshInterval = refreshInterval
+	}
+}
+
+func applyOptions(o ...Option) options {
+	opts := options{}
+	for _, option := range o {
+		option(&opts)
+	}
+	if opts.metrics == nil {
+		opts.metrics = jaeger.NewNullMetrics()
+	}
+	if opts.logger == nil {
+		opts.logger = jaeger.NullLogger
+	}
+	if opts.hostPort == "" {
+		opts.hostPort = defaultHostPort
+	}
+	if opts.refreshInterval == 0 {
+		opts.refreshInterval = defaultRefreshInterval
+	}
+	return opts
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/internal/baggage/remote/restriction_manager.go

@@ -0,0 +1,157 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package remote
+
+import (
+	"fmt"
+	"net/url"
+	"sync"
+	"time"
+
+	"github.com/uber/jaeger-client-go/internal/baggage"
+	thrift "github.com/uber/jaeger-client-go/thrift-gen/baggage"
+	"github.com/uber/jaeger-client-go/utils"
+)
+
+type httpBaggageRestrictionManagerProxy struct {
+	url string
+}
+
+func newHTTPBaggageRestrictionManagerProxy(hostPort, serviceName string) *httpBaggageRestrictionManagerProxy {
+	v := url.Values{}
+	v.Set("service", serviceName)
+	return &httpBaggageRestrictionManagerProxy{
+		url: fmt.Sprintf("http://%s/baggageRestrictions?%s", hostPort, v.Encode()),
+	}
+}
+
+func (s *httpBaggageRestrictionManagerProxy) GetBaggageRestrictions(serviceName string) ([]*thrift.BaggageRestriction, error) {
+	var out []*thrift.BaggageRestriction
+	if err := utils.GetJSON(s.url, &out); err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// RestrictionManager manages baggage restrictions by retrieving baggage restrictions from agent
+type RestrictionManager struct {
+	options
+
+	mux                sync.RWMutex
+	serviceName        string
+	restrictions       map[string]*baggage.Restriction
+	thriftProxy        thrift.BaggageRestrictionManager
+	pollStopped        sync.WaitGroup
+	stopPoll           chan struct{}
+	invalidRestriction *baggage.Restriction
+	validRestriction   *baggage.Restriction
+
+	// Determines if the manager has successfully retrieved baggage restrictions from agent
+	initialized bool
+}
+
+// NewRestrictionManager returns a BaggageRestrictionManager that polls the agent for the latest
+// baggage restrictions.
+func NewRestrictionManager(serviceName string, options ...Option) *RestrictionManager {
+	// TODO there is a developing use case where a single tracer can generate traces on behalf of many services.
+	// restrictionsMap will need to exist per service
+	opts := applyOptions(options...)
+	m := &RestrictionManager{
+		serviceName:        serviceName,
+		options:            opts,
+		restrictions:       make(map[string]*baggage.Restriction),
+		thriftProxy:        newHTTPBaggageRestrictionManagerProxy(opts.hostPort, serviceName),
+		stopPoll:           make(chan struct{}),
+		invalidRestriction: baggage.NewRestriction(false, 0),
+		validRestriction:   baggage.NewRestriction(true, defaultMaxValueLength),
+	}
+	m.pollStopped.Add(1)
+	go m.pollManager()
+	return m
+}
+
+// isReady returns true if the manager has retrieved baggage restrictions from the remote source.
+func (m *RestrictionManager) isReady() bool {
+	m.mux.RLock()
+	defer m.mux.RUnlock()
+	return m.initialized
+}
+
+// GetRestriction implements RestrictionManager#GetRestriction.
+func (m *RestrictionManager) GetRestriction(service, key string) *baggage.Restriction {
+	m.mux.RLock()
+	defer m.mux.RUnlock()
+	if !m.initialized {
+		if m.denyBaggageOnInitializationFailure {
+			return m.invalidRestriction
+		}
+		return m.validRestriction
+	}
+	if restriction, ok := m.restrictions[key]; ok {
+		return restriction
+	}
+	return m.invalidRestriction
+}
+
+// Close stops remote polling and closes the RemoteRestrictionManager.
+func (m *RestrictionManager) Close() error {
+	close(m.stopPoll)
+	m.pollStopped.Wait()
+	return nil
+}
+
+func (m *RestrictionManager) pollManager() {
+	defer m.pollStopped.Done()
+	// attempt to initialize baggage restrictions
+	if err := m.updateRestrictions(); err != nil {
+		m.logger.Error(fmt.Sprintf("Failed to initialize baggage restrictions: %s", err.Error()))
+	}
+	ticker := time.NewTicker(m.refreshInterval)
+	defer ticker.Stop()
+
+	for {
+		select {
+		case <-ticker.C:
+			if err := m.updateRestrictions(); err != nil {
+				m.logger.Error(fmt.Sprintf("Failed to update baggage restrictions: %s", err.Error()))
+			}
+		case <-m.stopPoll:
+			return
+		}
+	}
+}
+
+func (m *RestrictionManager) updateRestrictions() error {
+	restrictions, err := m.thriftProxy.GetBaggageRestrictions(m.serviceName)
+	if err != nil {
+		m.metrics.BaggageRestrictionsUpdateFailure.Inc(1)
+		return err
+	}
+	newRestrictions := m.parseRestrictions(restrictions)
+	m.metrics.BaggageRestrictionsUpdateSuccess.Inc(1)
+	m.mux.Lock()
+	defer m.mux.Unlock()
+	m.initialized = true
+	m.restrictions = newRestrictions
+	return nil
+}
+
+func (m *RestrictionManager) parseRestrictions(restrictions []*thrift.BaggageRestriction) map[string]*baggage.Restriction {
+	setters := make(map[string]*baggage.Restriction, len(restrictions))
+	for _, restriction := range restrictions {
+		setters[restriction.BaggageKey] = baggage.NewRestriction(true, int(restriction.MaxValueLength))
+	}
+	return setters
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/internal/baggage/remote/restriction_manager_test.go

@@ -0,0 +1,220 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package remote
+
+import (
+	"encoding/json"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"github.com/uber-go/atomic"
+	"github.com/uber/jaeger-lib/metrics"
+	"github.com/uber/jaeger-lib/metrics/testutils"
+
+	"github.com/uber/jaeger-client-go"
+	"github.com/uber/jaeger-client-go/internal/baggage"
+	thrift "github.com/uber/jaeger-client-go/thrift-gen/baggage"
+)
+
+const (
+	service      = "svc"
+	expectedKey  = "key"
+	expectedSize = 10
+)
+
+var (
+	testRestrictions = []*thrift.BaggageRestriction{
+		{BaggageKey: expectedKey, MaxValueLength: int32(expectedSize)},
+	}
+)
+
+var _ io.Closer = new(RestrictionManager) // API check
+
+type baggageHandler struct {
+	returnError  *atomic.Bool
+	restrictions []*thrift.BaggageRestriction
+}
+
+func (h *baggageHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	if h.returnError.Load() {
+		w.WriteHeader(http.StatusInternalServerError)
+	} else {
+		bytes, _ := json.Marshal(h.restrictions)
+		w.Header().Add("Content-Type", "application/json")
+		w.Write(bytes)
+	}
+}
+
+func (h *baggageHandler) setReturnError(b bool) {
+	h.returnError.Store(b)
+}
+
+func withHTTPServer(
+	restrictions []*thrift.BaggageRestriction,
+	f func(
+		metrics *jaeger.Metrics,
+		factory *metrics.LocalFactory,
+		handler *baggageHandler,
+		server *httptest.Server,
+	),
+) {
+	factory := metrics.NewLocalFactory(0)
+	m := jaeger.NewMetrics(factory, nil)
+
+	handler := &baggageHandler{returnError: atomic.NewBool(true), restrictions: restrictions}
+	server := httptest.NewServer(handler)
+	defer server.Close()
+
+	f(m, factory, handler, server)
+}
+
+func TestNewRemoteRestrictionManager(t *testing.T) {
+	withHTTPServer(
+		testRestrictions,
+		func(
+			metrics *jaeger.Metrics,
+			factory *metrics.LocalFactory,
+			handler *baggageHandler,
+			server *httptest.Server,
+		) {
+			handler.setReturnError(false)
+			mgr := NewRestrictionManager(
+				service,
+				Options.HostPort(getHostPort(t, server.URL)),
+				Options.Metrics(metrics),
+				Options.Logger(jaeger.NullLogger),
+			)
+			defer mgr.Close()
+
+			for i := 0; i < 100; i++ {
+				if mgr.isReady() {
+					break
+				}
+				time.Sleep(time.Millisecond)
+			}
+			require.True(t, mgr.isReady())
+
+			restriction := mgr.GetRestriction(service, expectedKey)
+			assert.EqualValues(t, baggage.NewRestriction(true, expectedSize), restriction)
+
+			badKey := "bad-key"
+			restriction = mgr.GetRestriction(service, badKey)
+			assert.EqualValues(t, baggage.NewRestriction(false, 0), restriction)
+
+			testutils.AssertCounterMetrics(t, factory,
+				testutils.ExpectedMetric{
+					Name:  "jaeger.baggage-restrictions-update",
+					Tags:  map[string]string{"result": "ok"},
+					Value: 1,
+				},
+			)
+		})
+}
+
+func TestDenyBaggageOnInitializationFailure(t *testing.T) {
+	withHTTPServer(
+		testRestrictions,
+		func(
+			m *jaeger.Metrics,
+			factory *metrics.LocalFactory,
+			handler *baggageHandler,
+			server *httptest.Server,
+		) {
+			mgr := NewRestrictionManager(
+				service,
+				Options.DenyBaggageOnInitializationFailure(true),
+				Options.HostPort(getHostPort(t, server.URL)),
+				Options.Metrics(m),
+				Options.Logger(jaeger.NullLogger),
+			)
+			require.False(t, mgr.isReady())
+
+			metricName := "jaeger.baggage-restrictions-update"
+			metricTags := map[string]string{"result": "err"}
+			key := metrics.GetKey(metricName, metricTags, "|", "=")
+			for i := 0; i < 100; i++ {
+				// wait until the async initialization call is complete
+				counters, _ := factory.Snapshot()
+				if _, ok := counters[key]; ok {
+					break
+				}
+				time.Sleep(time.Millisecond)
+			}
+
+			testutils.AssertCounterMetrics(t, factory,
+				testutils.ExpectedMetric{
+					Name:  metricName,
+					Tags:  metricTags,
+					Value: 1,
+				},
+			)
+
+			// DenyBaggageOnInitializationFailure should not allow any key to be written
+			restriction := mgr.GetRestriction(service, expectedKey)
+			assert.EqualValues(t, baggage.NewRestriction(false, 0), restriction)
+
+			// have the http server return restrictions
+			handler.setReturnError(false)
+			mgr.updateRestrictions()
+
+			// Wait until manager retrieves baggage restrictions
+			for i := 0; i < 100; i++ {
+				if mgr.isReady() {
+					break
+				}
+				time.Sleep(time.Millisecond)
+			}
+			require.True(t, mgr.isReady())
+
+			restriction = mgr.GetRestriction(service, expectedKey)
+			assert.EqualValues(t, baggage.NewRestriction(true, expectedSize), restriction)
+		})
+}
+
+func TestAllowBaggageOnInitializationFailure(t *testing.T) {
+	withHTTPServer(
+		testRestrictions,
+		func(
+			metrics *jaeger.Metrics,
+			factory *metrics.LocalFactory,
+			handler *baggageHandler,
+			server *httptest.Server,
+		) {
+			mgr := NewRestrictionManager(
+				service,
+				Options.RefreshInterval(time.Millisecond),
+				Options.HostPort(getHostPort(t, server.URL)),
+				Options.Metrics(metrics),
+				Options.Logger(jaeger.NullLogger),
+			)
+			require.False(t, mgr.isReady())
+
+			// AllowBaggageOnInitializationFailure should allow any key to be written
+			restriction := mgr.GetRestriction(service, expectedKey)
+			assert.EqualValues(t, baggage.NewRestriction(true, 2048), restriction)
+		})
+}
+
+func getHostPort(t *testing.T, s string) string {
+	u, err := url.Parse(s)
+	require.NoError(t, err, "Failed to parse url")
+	return u.Host
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/internal/baggage/restriction_manager.go

@@ -0,0 +1,71 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package baggage
+
+const (
+	defaultMaxValueLength = 2048
+)
+
+// Restriction determines whether a baggage key is allowed and contains any restrictions on the baggage value.
+type Restriction struct {
+	keyAllowed     bool
+	maxValueLength int
+}
+
+// NewRestriction returns a new Restriction.
+func NewRestriction(keyAllowed bool, maxValueLength int) *Restriction {
+	return &Restriction{
+		keyAllowed:     keyAllowed,
+		maxValueLength: maxValueLength,
+	}
+}
+
+// KeyAllowed returns whether the baggage key for this restriction is allowed.
+func (r *Restriction) KeyAllowed() bool {
+	return r.keyAllowed
+}
+
+// MaxValueLength returns the max length for the baggage value.
+func (r *Restriction) MaxValueLength() int {
+	return r.maxValueLength
+}
+
+// RestrictionManager keeps track of valid baggage keys and their restrictions. The manager
+// will return a Restriction for a specific baggage key which will determine whether the baggage
+// key is allowed for the current service and any other applicable restrictions on the baggage
+// value.
+type RestrictionManager interface {
+	GetRestriction(service, key string) *Restriction
+}
+
+// DefaultRestrictionManager allows any baggage key.
+type DefaultRestrictionManager struct {
+	defaultRestriction *Restriction
+}
+
+// NewDefaultRestrictionManager returns a DefaultRestrictionManager.
+func NewDefaultRestrictionManager(maxValueLength int) *DefaultRestrictionManager {
+	if maxValueLength == 0 {
+		maxValueLength = defaultMaxValueLength
+	}
+	return &DefaultRestrictionManager{
+		defaultRestriction: &Restriction{keyAllowed: true, maxValueLength: maxValueLength},
+	}
+}
+
+// GetRestriction implements RestrictionManager#GetRestriction.
+func (m *DefaultRestrictionManager) GetRestriction(service, key string) *Restriction {
+	return m.defaultRestriction
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/internal/baggage/restriction_manager_test.go

@@ -0,0 +1,29 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package baggage
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+var _ RestrictionManager = &DefaultRestrictionManager{}
+
+func TestDefaultRestrictionManager(t *testing.T) {
+	mgr := NewDefaultRestrictionManager(0)
+	restriction := mgr.GetRestriction("svc", "key")
+	assert.EqualValues(t, NewRestriction(true, 2048), restriction)
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/internal/spanlog/json.go

@@ -0,0 +1,81 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package spanlog
+
+import (
+	"encoding/json"
+	"fmt"
+
+	"github.com/opentracing/opentracing-go/log"
+)
+
+type fieldsAsMap map[string]string
+
+// MaterializeWithJSON converts log Fields into JSON string
+// TODO refactor into pluggable materializer
+func MaterializeWithJSON(logFields []log.Field) ([]byte, error) {
+	fields := fieldsAsMap(make(map[string]string, len(logFields)))
+	for _, field := range logFields {
+		field.Marshal(fields)
+	}
+	if event, ok := fields["event"]; ok && len(fields) == 1 {
+		return []byte(event), nil
+	}
+	return json.Marshal(fields)
+}
+
+func (ml fieldsAsMap) EmitString(key, value string) {
+	ml[key] = value
+}
+
+func (ml fieldsAsMap) EmitBool(key string, value bool) {
+	ml[key] = fmt.Sprintf("%t", value)
+}
+
+func (ml fieldsAsMap) EmitInt(key string, value int) {
+	ml[key] = fmt.Sprintf("%d", value)
+}
+
+func (ml fieldsAsMap) EmitInt32(key string, value int32) {
+	ml[key] = fmt.Sprintf("%d", value)
+}
+
+func (ml fieldsAsMap) EmitInt64(key string, value int64) {
+	ml[key] = fmt.Sprintf("%d", value)
+}
+
+func (ml fieldsAsMap) EmitUint32(key string, value uint32) {
+	ml[key] = fmt.Sprintf("%d", value)
+}
+
+func (ml fieldsAsMap) EmitUint64(key string, value uint64) {
+	ml[key] = fmt.Sprintf("%d", value)
+}
+
+func (ml fieldsAsMap) EmitFloat32(key string, value float32) {
+	ml[key] = fmt.Sprintf("%f", value)
+}
+
+func (ml fieldsAsMap) EmitFloat64(key string, value float64) {
+	ml[key] = fmt.Sprintf("%f", value)
+}
+
+func (ml fieldsAsMap) EmitObject(key string, value interface{}) {
+	ml[key] = fmt.Sprintf("%+v", value)
+}
+
+func (ml fieldsAsMap) EmitLazyLogger(value log.LazyLogger) {
+	value(ml)
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/interop.go

@@ -0,0 +1,55 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package jaeger
+
+import (
+	"github.com/opentracing/opentracing-go"
+)
+
+// TODO this file should not be needed after TChannel PR.
+
+type formatKey int
+
+// SpanContextFormat is a constant used as OpenTracing Format.
+// Requires *SpanContext as carrier.
+// This format is intended for interop with TChannel or other Zipkin-like tracers.
+const SpanContextFormat formatKey = iota
+
+type jaegerTraceContextPropagator struct {
+	tracer *Tracer
+}
+
+func (p *jaegerTraceContextPropagator) Inject(
+	ctx SpanContext,
+	abstractCarrier interface{},
+) error {
+	carrier, ok := abstractCarrier.(*SpanContext)
+	if !ok {
+		return opentracing.ErrInvalidCarrier
+	}
+
+	carrier.CopyFrom(&ctx)
+	return nil
+}
+
+func (p *jaegerTraceContextPropagator) Extract(abstractCarrier interface{}) (SpanContext, error) {
+	carrier, ok := abstractCarrier.(*SpanContext)
+	if !ok {
+		return emptyContext, opentracing.ErrInvalidCarrier
+	}
+	ctx := new(SpanContext)
+	ctx.CopyFrom(carrier)
+	return *ctx, nil
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/jaeger_tag.go

@@ -0,0 +1,84 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package jaeger
+
+import (
+	"fmt"
+
+	"github.com/opentracing/opentracing-go/log"
+
+	j "github.com/uber/jaeger-client-go/thrift-gen/jaeger"
+)
+
+type tags []*j.Tag
+
+// ConvertLogsToJaegerTags converts log Fields into jaeger tags.
+func ConvertLogsToJaegerTags(logFields []log.Field) []*j.Tag {
+	fields := tags(make([]*j.Tag, 0, len(logFields)))
+	for _, field := range logFields {
+		field.Marshal(&fields)
+	}
+	return fields
+}
+
+func (t *tags) EmitString(key, value string) {
+	*t = append(*t, &j.Tag{Key: key, VType: j.TagType_STRING, VStr: &value})
+}
+
+func (t *tags) EmitBool(key string, value bool) {
+	*t = append(*t, &j.Tag{Key: key, VType: j.TagType_BOOL, VBool: &value})
+}
+
+func (t *tags) EmitInt(key string, value int) {
+	vLong := int64(value)
+	*t = append(*t, &j.Tag{Key: key, VType: j.TagType_LONG, VLong: &vLong})
+}
+
+func (t *tags) EmitInt32(key string, value int32) {
+	vLong := int64(value)
+	*t = append(*t, &j.Tag{Key: key, VType: j.TagType_LONG, VLong: &vLong})
+}
+
+func (t *tags) EmitInt64(key string, value int64) {
+	*t = append(*t, &j.Tag{Key: key, VType: j.TagType_LONG, VLong: &value})
+}
+
+func (t *tags) EmitUint32(key string, value uint32) {
+	vLong := int64(value)
+	*t = append(*t, &j.Tag{Key: key, VType: j.TagType_LONG, VLong: &vLong})
+}
+
+func (t *tags) EmitUint64(key string, value uint64) {
+	vLong := int64(value)
+	*t = append(*t, &j.Tag{Key: key, VType: j.TagType_LONG, VLong: &vLong})
+}
+
+func (t *tags) EmitFloat32(key string, value float32) {
+	vDouble := float64(value)
+	*t = append(*t, &j.Tag{Key: key, VType: j.TagType_DOUBLE, VDouble: &vDouble})
+}
+
+func (t *tags) EmitFloat64(key string, value float64) {
+	*t = append(*t, &j.Tag{Key: key, VType: j.TagType_DOUBLE, VDouble: &value})
+}
+
+func (t *tags) EmitObject(key string, value interface{}) {
+	vStr := fmt.Sprintf("%+v", value)
+	*t = append(*t, &j.Tag{Key: key, VType: j.TagType_STRING, VStr: &vStr})
+}
+
+func (t *tags) EmitLazyLogger(value log.LazyLogger) {
+	value(t)
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/jaeger_thrift_span.go

@@ -0,0 +1,172 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package jaeger
+
+import (
+	"time"
+
+	"github.com/opentracing/opentracing-go"
+
+	j "github.com/uber/jaeger-client-go/thrift-gen/jaeger"
+	"github.com/uber/jaeger-client-go/utils"
+)
+
+// BuildJaegerThrift builds jaeger span based on internal span.
+func BuildJaegerThrift(span *Span) *j.Span {
+	startTime := utils.TimeToMicrosecondsSinceEpochInt64(span.startTime)
+	duration := span.duration.Nanoseconds() / int64(time.Microsecond)
+	jaegerSpan := &j.Span{
+		TraceIdLow:    int64(span.context.traceID.Low),
+		TraceIdHigh:   int64(span.context.traceID.High),
+		SpanId:        int64(span.context.spanID),
+		ParentSpanId:  int64(span.context.parentID),
+		OperationName: span.operationName,
+		Flags:         int32(span.context.flags),
+		StartTime:     startTime,
+		Duration:      duration,
+		Tags:          buildTags(span.tags),
+		Logs:          buildLogs(span.logs),
+		References:    buildReferences(span.references),
+	}
+	return jaegerSpan
+}
+
+// BuildJaegerProcessThrift creates a thrift Process type.
+func BuildJaegerProcessThrift(span *Span) *j.Process {
+	return buildJaegerProcessThrift(span.tracer)
+}
+
+func buildJaegerProcessThrift(tracer *Tracer) *j.Process {
+	process := &j.Process{
+		ServiceName: tracer.serviceName,
+		Tags:        buildTags(tracer.tags),
+	}
+	return process
+}
+
+func buildTags(tags []Tag) []*j.Tag {
+	jTags := make([]*j.Tag, 0, len(tags))
+	for _, tag := range tags {
+		jTag := buildTag(&tag)
+		jTags = append(jTags, jTag)
+	}
+	return jTags
+}
+
+func buildLogs(logs []opentracing.LogRecord) []*j.Log {
+	jLogs := make([]*j.Log, 0, len(logs))
+	for _, log := range logs {
+		jLog := &j.Log{
+			Timestamp: utils.TimeToMicrosecondsSinceEpochInt64(log.Timestamp),
+			Fields:    ConvertLogsToJaegerTags(log.Fields),
+		}
+		jLogs = append(jLogs, jLog)
+	}
+	return jLogs
+}
+
+func buildTag(tag *Tag) *j.Tag {
+	jTag := &j.Tag{Key: tag.key}
+	switch value := tag.value.(type) {
+	case string:
+		vStr := truncateString(value)
+		jTag.VStr = &vStr
+		jTag.VType = j.TagType_STRING
+	case []byte:
+		if len(value) > maxAnnotationLength {
+			value = value[:maxAnnotationLength]
+		}
+		jTag.VBinary = value
+		jTag.VType = j.TagType_BINARY
+	case int:
+		vLong := int64(value)
+		jTag.VLong = &vLong
+		jTag.VType = j.TagType_LONG
+	case uint:
+		vLong := int64(value)
+		jTag.VLong = &vLong
+		jTag.VType = j.TagType_LONG
+	case int8:
+		vLong := int64(value)
+		jTag.VLong = &vLong
+		jTag.VType = j.TagType_LONG
+	case uint8:
+		vLong := int64(value)
+		jTag.VLong = &vLong
+		jTag.VType = j.TagType_LONG
+	case int16:
+		vLong := int64(value)
+		jTag.VLong = &vLong
+		jTag.VType = j.TagType_LONG
+	case uint16:
+		vLong := int64(value)
+		jTag.VLong = &vLong
+		jTag.VType = j.TagType_LONG
+	case int32:
+		vLong := int64(value)
+		jTag.VLong = &vLong
+		jTag.VType = j.TagType_LONG
+	case uint32:
+		vLong := int64(value)
+		jTag.VLong = &vLong
+		jTag.VType = j.TagType_LONG
+	case int64:
+		vLong := int64(value)
+		jTag.VLong = &vLong
+		jTag.VType = j.TagType_LONG
+	case uint64:
+		vLong := int64(value)
+		jTag.VLong = &vLong
+		jTag.VType = j.TagType_LONG
+	case float32:
+		vDouble := float64(value)
+		jTag.VDouble = &vDouble
+		jTag.VType = j.TagType_DOUBLE
+	case float64:
+		vDouble := float64(value)
+		jTag.VDouble = &vDouble
+		jTag.VType = j.TagType_DOUBLE
+	case bool:
+		vBool := value
+		jTag.VBool = &vBool
+		jTag.VType = j.TagType_BOOL
+	default:
+		vStr := truncateString(stringify(value))
+		jTag.VStr = &vStr
+		jTag.VType = j.TagType_STRING
+	}
+	return jTag
+}
+
+func buildReferences(references []Reference) []*j.SpanRef {
+	retMe := make([]*j.SpanRef, 0, len(references))
+	for _, ref := range references {
+		if ref.Type == opentracing.ChildOfRef {
+			retMe = append(retMe, spanRef(ref.Context, j.SpanRefType_CHILD_OF))
+		} else if ref.Type == opentracing.FollowsFromRef {
+			retMe = append(retMe, spanRef(ref.Context, j.SpanRefType_FOLLOWS_FROM))
+		}
+	}
+	return retMe
+}
+
+func spanRef(ctx SpanContext, refType j.SpanRefType) *j.SpanRef {
+	return &j.SpanRef{
+		RefType:     refType,
+		TraceIdLow:  int64(ctx.traceID.Low),
+		TraceIdHigh: int64(ctx.traceID.High),
+		SpanId:      int64(ctx.spanID),
+	}
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/jaeger_thrift_span_test.go

@@ -0,0 +1,388 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package jaeger
+
+import (
+	"errors"
+	"fmt"
+	"testing"
+	"time"
+
+	"github.com/opentracing/opentracing-go"
+	"github.com/opentracing/opentracing-go/ext"
+	"github.com/opentracing/opentracing-go/log"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	j "github.com/uber/jaeger-client-go/thrift-gen/jaeger"
+	"github.com/uber/jaeger-client-go/utils"
+)
+
+var (
+	someString      = "str"
+	someBool        = true
+	someLong        = int64(123)
+	someDouble      = float64(123)
+	someBinary      = []byte("hello")
+	someSlice       = []string{"a"}
+	someSliceString = "[a]"
+)
+
+func TestBuildJaegerThrift(t *testing.T) {
+	tracer, closer := NewTracer("DOOP",
+		NewConstSampler(true),
+		NewNullReporter())
+	defer closer.Close()
+
+	sp1 := tracer.StartSpan("sp1").(*Span)
+	ext.SpanKindRPCServer.Set(sp1)
+	ext.PeerService.Set(sp1, "svc")
+	sp2 := tracer.StartSpan("sp2", opentracing.ChildOf(sp1.Context())).(*Span)
+	ext.SpanKindRPCClient.Set(sp2)
+	sp2.Finish()
+	sp1.Finish()
+
+	jaegerSpan1 := BuildJaegerThrift(sp1)
+	jaegerSpan2 := BuildJaegerThrift(sp2)
+	assert.Equal(t, "sp1", jaegerSpan1.OperationName)
+	assert.Equal(t, "sp2", jaegerSpan2.OperationName)
+	assert.EqualValues(t, 0, jaegerSpan1.ParentSpanId)
+	assert.Equal(t, jaegerSpan1.SpanId, jaegerSpan2.ParentSpanId)
+	assert.Len(t, jaegerSpan1.Tags, 4)
+	tag := findTag(jaegerSpan1, SamplerTypeTagKey)
+	assert.Equal(t, SamplerTypeConst, *tag.VStr)
+	tag = findTag(jaegerSpan1, string(ext.SpanKind))
+	assert.Equal(t, string(ext.SpanKindRPCServerEnum), *tag.VStr)
+	tag = findTag(jaegerSpan1, string(ext.PeerService))
+	assert.Equal(t, "svc", *tag.VStr)
+	assert.Empty(t, jaegerSpan1.References)
+
+	assert.Len(t, jaegerSpan2.References, 1)
+	assert.Equal(t, j.SpanRefType_CHILD_OF, jaegerSpan2.References[0].RefType)
+	assert.EqualValues(t, jaegerSpan1.TraceIdLow, jaegerSpan2.References[0].TraceIdLow)
+	assert.EqualValues(t, jaegerSpan1.TraceIdHigh, jaegerSpan2.References[0].TraceIdHigh)
+	assert.EqualValues(t, jaegerSpan1.SpanId, jaegerSpan2.References[0].SpanId)
+	tag = findTag(jaegerSpan2, string(ext.SpanKind))
+	assert.Equal(t, string(ext.SpanKindRPCClientEnum), *tag.VStr)
+}
+
+func TestBuildJaegerProcessThrift(t *testing.T) {
+	tracer, closer := NewTracer("DOOP",
+		NewConstSampler(true),
+		NewNullReporter())
+	defer closer.Close()
+
+	sp := tracer.StartSpan("sp1").(*Span)
+	sp.Finish()
+
+	process := BuildJaegerProcessThrift(sp)
+	assert.Equal(t, process.ServiceName, "DOOP")
+	require.Len(t, process.Tags, 3)
+	assert.NotNil(t, findJaegerTag("jaeger.version", process.Tags))
+	assert.NotNil(t, findJaegerTag("hostname", process.Tags))
+	assert.NotNil(t, findJaegerTag("ip", process.Tags))
+}
+
+func TestBuildLogs(t *testing.T) {
+	tracer, closer := NewTracer("DOOP",
+		NewConstSampler(true),
+		NewNullReporter())
+	defer closer.Close()
+	root := tracer.StartSpan("s1")
+
+	someTime := time.Now().Add(-time.Minute)
+	someTimeInt64 := utils.TimeToMicrosecondsSinceEpochInt64(someTime)
+
+	errString := "error"
+
+	tests := []struct {
+		field             log.Field
+		logFunc           func(sp opentracing.Span)
+		expected          []*j.Tag
+		expectedTimestamp int64
+		disableSampling   bool
+	}{
+		{field: log.String("event", someString), expected: []*j.Tag{{Key: "event", VType: j.TagType_STRING, VStr: &someString}}},
+		{field: log.String("k", someString), expected: []*j.Tag{{Key: "k", VType: j.TagType_STRING, VStr: &someString}}},
+		{field: log.Bool("k", someBool), expected: []*j.Tag{{Key: "k", VType: j.TagType_BOOL, VBool: &someBool}}},
+		{field: log.Int("k", 123), expected: []*j.Tag{{Key: "k", VType: j.TagType_LONG, VLong: &someLong}}},
+		{field: log.Int32("k", 123), expected: []*j.Tag{{Key: "k", VType: j.TagType_LONG, VLong: &someLong}}},
+		{field: log.Int64("k", 123), expected: []*j.Tag{{Key: "k", VType: j.TagType_LONG, VLong: &someLong}}},
+		{field: log.Uint32("k", 123), expected: []*j.Tag{{Key: "k", VType: j.TagType_LONG, VLong: &someLong}}},
+		{field: log.Uint64("k", 123), expected: []*j.Tag{{Key: "k", VType: j.TagType_LONG, VLong: &someLong}}},
+		{field: log.Float32("k", 123), expected: []*j.Tag{{Key: "k", VType: j.TagType_DOUBLE, VDouble: &someDouble}}},
+		{field: log.Float64("k", 123), expected: []*j.Tag{{Key: "k", VType: j.TagType_DOUBLE, VDouble: &someDouble}}},
+		{field: log.Error(errors.New(errString)), expected: []*j.Tag{{Key: "error", VType: j.TagType_STRING, VStr: &errString}}},
+		{field: log.Object("k", someSlice), expected: []*j.Tag{{Key: "k", VType: j.TagType_STRING, VStr: &someSliceString}}},
+		{
+			field: log.Lazy(func(fv log.Encoder) {
+				fv.EmitBool("k", someBool)
+			}),
+			expected: []*j.Tag{{Key: "k", VType: j.TagType_BOOL, VBool: &someBool}},
+		},
+		{
+			logFunc: func(sp opentracing.Span) {
+				sp.LogKV("event", someString)
+			},
+			expected: []*j.Tag{{Key: "event", VType: j.TagType_STRING, VStr: &someString}},
+		},
+		{
+			logFunc: func(sp opentracing.Span) {
+				sp.LogKV("non-even number of arguments")
+			},
+			// this is a bit fragile, but ¯\_(ツ)_/¯
+			expected: []*j.Tag{
+				{Key: "error", VType: j.TagType_STRING, VStr: getStringPtr("non-even keyValues len: 1")},
+				{Key: "function", VType: j.TagType_STRING, VStr: getStringPtr("LogKV")},
+			},
+		},
+		{
+			logFunc: func(sp opentracing.Span) {
+				sp.LogEvent(someString)
+			},
+			expected: []*j.Tag{{Key: "event", VType: j.TagType_STRING, VStr: &someString}},
+		},
+		{
+			logFunc: func(sp opentracing.Span) {
+				sp.LogEventWithPayload(someString, "payload")
+			},
+			expected: []*j.Tag{
+				{Key: "event", VType: j.TagType_STRING, VStr: &someString},
+				{Key: "payload", VType: j.TagType_STRING, VStr: getStringPtr("payload")},
+			},
+		},
+		{
+			logFunc: func(sp opentracing.Span) {
+				sp.Log(opentracing.LogData{Event: someString})
+			},
+			expected: []*j.Tag{{Key: "event", VType: j.TagType_STRING, VStr: &someString}},
+		},
+		{
+			logFunc: func(sp opentracing.Span) {
+				sp.Log(opentracing.LogData{Event: someString, Payload: "payload"})
+			},
+			expected: []*j.Tag{
+				{Key: "event", VType: j.TagType_STRING, VStr: &someString},
+				{Key: "payload", VType: j.TagType_STRING, VStr: getStringPtr("payload")},
+			},
+		},
+		{
+			logFunc: func(sp opentracing.Span) {
+				sp.FinishWithOptions(opentracing.FinishOptions{
+					LogRecords: []opentracing.LogRecord{
+						{
+							Timestamp: someTime,
+							Fields:    []log.Field{log.String("event", someString)},
+						},
+					},
+				})
+			},
+			expected:          []*j.Tag{{Key: "event", VType: j.TagType_STRING, VStr: &someString}},
+			expectedTimestamp: someTimeInt64,
+		},
+		{
+			logFunc: func(sp opentracing.Span) {
+				sp.FinishWithOptions(opentracing.FinishOptions{
+					BulkLogData: []opentracing.LogData{
+						{
+							Timestamp: someTime,
+							Event:     someString,
+						},
+					},
+				})
+			},
+			expected:          []*j.Tag{{Key: "event", VType: j.TagType_STRING, VStr: &someString}},
+			expectedTimestamp: someTimeInt64,
+		},
+		{
+			logFunc: func(sp opentracing.Span) {
+				sp.FinishWithOptions(opentracing.FinishOptions{
+					BulkLogData: []opentracing.LogData{
+						{
+							Timestamp: someTime,
+							Event:     someString,
+							Payload:   "payload",
+						},
+					},
+				})
+			},
+			expected: []*j.Tag{
+				{Key: "event", VType: j.TagType_STRING, VStr: &someString},
+				{Key: "payload", VType: j.TagType_STRING, VStr: getStringPtr("payload")},
+			},
+			expectedTimestamp: someTimeInt64,
+		},
+		{
+			disableSampling: true,
+			field:           log.String("event", someString),
+		},
+		{
+			disableSampling: true,
+			logFunc: func(sp opentracing.Span) {
+				sp.LogKV("event", someString)
+			},
+		},
+	}
+	for i, test := range tests {
+		testName := fmt.Sprintf("test-%02d", i)
+		sp := tracer.StartSpan(testName, opentracing.ChildOf(root.Context()))
+		if test.disableSampling {
+			ext.SamplingPriority.Set(sp, 0)
+		}
+		if test.logFunc != nil {
+			test.logFunc(sp)
+		} else if test.field != (log.Field{}) {
+			sp.LogFields(test.field)
+		}
+		jaegerSpan := BuildJaegerThrift(sp.(*Span))
+		if test.disableSampling {
+			assert.Equal(t, 0, len(jaegerSpan.Logs), testName)
+			continue
+		}
+		assert.Equal(t, 1, len(jaegerSpan.Logs), testName)
+		compareTagSlices(t, test.expected, jaegerSpan.Logs[0].GetFields(), testName)
+		if test.expectedTimestamp != 0 {
+			assert.Equal(t, test.expectedTimestamp, jaegerSpan.Logs[0].Timestamp, testName)
+		}
+	}
+}
+
+func TestBuildTags(t *testing.T) {
+	tests := []struct {
+		tag      Tag
+		expected *j.Tag
+	}{
+		{tag: Tag{key: "k", value: someString}, expected: &j.Tag{Key: "k", VType: j.TagType_STRING, VStr: &someString}},
+		{tag: Tag{key: "k", value: int(123)}, expected: &j.Tag{Key: "k", VType: j.TagType_LONG, VLong: &someLong}},
+		{tag: Tag{key: "k", value: uint(123)}, expected: &j.Tag{Key: "k", VType: j.TagType_LONG, VLong: &someLong}},
+		{tag: Tag{key: "k", value: int8(123)}, expected: &j.Tag{Key: "k", VType: j.TagType_LONG, VLong: &someLong}},
+		{tag: Tag{key: "k", value: uint8(123)}, expected: &j.Tag{Key: "k", VType: j.TagType_LONG, VLong: &someLong}},
+		{tag: Tag{key: "k", value: int16(123)}, expected: &j.Tag{Key: "k", VType: j.TagType_LONG, VLong: &someLong}},
+		{tag: Tag{key: "k", value: uint16(123)}, expected: &j.Tag{Key: "k", VType: j.TagType_LONG, VLong: &someLong}},
+		{tag: Tag{key: "k", value: int32(123)}, expected: &j.Tag{Key: "k", VType: j.TagType_LONG, VLong: &someLong}},
+		{tag: Tag{key: "k", value: uint32(123)}, expected: &j.Tag{Key: "k", VType: j.TagType_LONG, VLong: &someLong}},
+		{tag: Tag{key: "k", value: int64(123)}, expected: &j.Tag{Key: "k", VType: j.TagType_LONG, VLong: &someLong}},
+		{tag: Tag{key: "k", value: uint64(123)}, expected: &j.Tag{Key: "k", VType: j.TagType_LONG, VLong: &someLong}},
+		{tag: Tag{key: "k", value: float32(123)}, expected: &j.Tag{Key: "k", VType: j.TagType_DOUBLE, VDouble: &someDouble}},
+		{tag: Tag{key: "k", value: float64(123)}, expected: &j.Tag{Key: "k", VType: j.TagType_DOUBLE, VDouble: &someDouble}},
+		{tag: Tag{key: "k", value: someBool}, expected: &j.Tag{Key: "k", VType: j.TagType_BOOL, VBool: &someBool}},
+		{tag: Tag{key: "k", value: someBinary}, expected: &j.Tag{Key: "k", VType: j.TagType_BINARY, VBinary: someBinary}},
+		{tag: Tag{key: "k", value: someSlice}, expected: &j.Tag{Key: "k", VType: j.TagType_STRING, VStr: &someSliceString}},
+	}
+	for i, test := range tests {
+		testName := fmt.Sprintf("test-%02d", i)
+		actual := buildTags([]Tag{test.tag})
+		assert.Len(t, actual, 1)
+		compareTags(t, test.expected, actual[0], testName)
+	}
+}
+
+func TestBuildReferences(t *testing.T) {
+	references := []Reference{
+		{Type: opentracing.ChildOfRef, Context: SpanContext{traceID: TraceID{High: 1, Low: 1}, spanID: SpanID(1)}},
+		{Type: opentracing.FollowsFromRef, Context: SpanContext{traceID: TraceID{High: 2, Low: 2}, spanID: SpanID(2)}},
+	}
+	spanRefs := buildReferences(references)
+	assert.Len(t, spanRefs, 2)
+	assert.Equal(t, j.SpanRefType_CHILD_OF, spanRefs[0].RefType)
+	assert.EqualValues(t, 1, spanRefs[0].SpanId)
+	assert.EqualValues(t, 1, spanRefs[0].TraceIdHigh)
+	assert.EqualValues(t, 1, spanRefs[0].TraceIdLow)
+
+	assert.Equal(t, j.SpanRefType_FOLLOWS_FROM, spanRefs[1].RefType)
+	assert.EqualValues(t, 2, spanRefs[1].SpanId)
+	assert.EqualValues(t, 2, spanRefs[1].TraceIdHigh)
+	assert.EqualValues(t, 2, spanRefs[1].TraceIdLow)
+}
+
+func TestJaegerSpanBaggageLogs(t *testing.T) {
+	tracer, closer := NewTracer("DOOP",
+		NewConstSampler(true),
+		NewNullReporter())
+	defer closer.Close()
+
+	sp := tracer.StartSpan("s1").(*Span)
+	sp.SetBaggageItem("auth.token", "token")
+	ext.SpanKindRPCServer.Set(sp)
+	sp.Finish()
+
+	jaegerSpan := BuildJaegerThrift(sp)
+	require.Len(t, jaegerSpan.Logs, 1)
+	fields := jaegerSpan.Logs[0].Fields
+	require.Len(t, fields, 3)
+	assertJaegerTag(t, fields, "event", "baggage")
+	assertJaegerTag(t, fields, "key", "auth.token")
+	assertJaegerTag(t, fields, "value", "token")
+}
+
+func assertJaegerTag(t *testing.T, tags []*j.Tag, key string, value string) {
+	tag := findJaegerTag(key, tags)
+	require.NotNil(t, tag)
+	assert.Equal(t, value, tag.GetVStr())
+}
+
+func getStringPtr(s string) *string {
+	return &s
+}
+
+func findTag(span *j.Span, key string) *j.Tag {
+	for _, s := range span.Tags {
+		if s.Key == key {
+			return s
+		}
+	}
+	return nil
+}
+
+func findJaegerTag(key string, tags []*j.Tag) *j.Tag {
+	for _, tag := range tags {
+		if tag.Key == key {
+			return tag
+		}
+	}
+	return nil
+}
+
+func compareTagSlices(t *testing.T, expectedTags, actualTags []*j.Tag, testName string) {
+	assert.Equal(t, len(expectedTags), len(actualTags))
+	for _, expectedTag := range expectedTags {
+		actualTag := findJaegerTag(expectedTag.Key, actualTags)
+		compareTags(t, expectedTag, actualTag, testName)
+	}
+}
+
+func compareTags(t *testing.T, expected, actual *j.Tag, testName string) {
+	if expected == nil && actual == nil {
+		return
+	}
+	if expected == nil || actual == nil {
+		assert.Fail(t, "one of the tags is nil", testName)
+		return
+	}
+	assert.Equal(t, expected.Key, actual.Key, testName)
+	assert.Equal(t, expected.VType, actual.VType, testName)
+	switch expected.VType {
+	case j.TagType_STRING:
+		assert.Equal(t, *expected.VStr, *actual.VStr, testName)
+	case j.TagType_LONG:
+		assert.Equal(t, *expected.VLong, *actual.VLong, testName)
+	case j.TagType_DOUBLE:
+		assert.Equal(t, *expected.VDouble, *actual.VDouble, testName)
+	case j.TagType_BOOL:
+		assert.Equal(t, *expected.VBool, *actual.VBool, testName)
+	case j.TagType_BINARY:
+		assert.Equal(t, expected.VBinary, actual.VBinary, testName)
+	}
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/log/logger.go

@@ -0,0 +1,51 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package log
+
+import "log"
+
+// Logger provides an abstract interface for logging from Reporters.
+// Applications can provide their own implementation of this interface to adapt
+// reporters logging to whatever logging library they prefer (stdlib log,
+// logrus, go-logging, etc).
+type Logger interface {
+	// Error logs a message at error priority
+	Error(msg string)
+
+	// Infof logs a message at info priority
+	Infof(msg string, args ...interface{})
+}
+
+// StdLogger is implementation of the Logger interface that delegates to default `log` package
+var StdLogger = &stdLogger{}
+
+type stdLogger struct{}
+
+func (l *stdLogger) Error(msg string) {
+	log.Printf("ERROR: %s", msg)
+}
+
+// Infof logs a message at info priority
+func (l *stdLogger) Infof(msg string, args ...interface{}) {
+	log.Printf(msg, args...)
+}
+
+// NullLogger is implementation of the Logger interface that delegates to default `log` package
+var NullLogger = &nullLogger{}
+
+type nullLogger struct{}
+
+func (l *nullLogger) Error(msg string)                      {}
+func (l *nullLogger) Infof(msg string, args ...interface{}) {}

vendor/src/github.com/jaegertracing/jaeger-client-go/log/logger_test.go

@@ -0,0 +1,26 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package log
+
+import (
+	"testing"
+)
+
+func TestLogger(t *testing.T) {
+	for _, logger := range []Logger{StdLogger, NullLogger} {
+		logger.Infof("Hi %s", "there")
+		logger.Error("Bad wolf")
+	}
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/log/zap/field.go

@@ -0,0 +1,60 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package zap
+
+import (
+	"context"
+	"fmt"
+
+	jaeger "github.com/uber/jaeger-client-go"
+
+	opentracing "github.com/opentracing/opentracing-go"
+	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
+)
+
+// Trace creates a field that extracts tracing information from a context and
+// includes it under the "trace" key.
+//
+// Because the opentracing APIs don't expose this information, the returned
+// zap.Field is a no-op for contexts that don't contain a span or contain a
+// non-Jaeger span.
+func Trace(ctx context.Context) zapcore.Field {
+	if ctx == nil {
+		return zap.Skip()
+	}
+	return zap.Object("trace", trace{ctx})
+}
+
+type trace struct {
+	ctx context.Context
+}
+
+func (t trace) MarshalLogObject(enc zapcore.ObjectEncoder) error {
+	span := opentracing.SpanFromContext(t.ctx)
+	if span == nil {
+		return nil
+	}
+	j, ok := span.Context().(jaeger.SpanContext)
+	if !ok {
+		return nil
+	}
+	if !j.IsValid() {
+		return fmt.Errorf("invalid span: %v", j.SpanID())
+	}
+	enc.AddString("span", j.SpanID().String())
+	enc.AddString("trace", j.TraceID().String())
+	return nil
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/log/zap/field_test.go

@@ -0,0 +1,64 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package zap
+
+import (
+	"context"
+	"testing"
+
+	jaeger "github.com/uber/jaeger-client-go"
+
+	opentracing "github.com/opentracing/opentracing-go"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
+)
+
+func TestTraceField(t *testing.T) {
+	assert.Equal(t, zap.Skip(), Trace(nil), "Expected Trace of a nil context to be a no-op.")
+
+	withTracedContext(func(ctx context.Context) {
+		enc := zapcore.NewMapObjectEncoder()
+		Trace(ctx).AddTo(enc)
+
+		logged, ok := enc.Fields["trace"].(map[string]interface{})
+		require.True(t, ok, "Expected trace to be a map.")
+
+		// We could extract the span from the context and assert specific IDs,
+		// but that just copies the production code. Instead, just assert that
+		// the keys we expect are present.
+		keys := make(map[string]struct{}, len(logged))
+		for k := range logged {
+			keys[k] = struct{}{}
+		}
+		assert.Equal(
+			t,
+			map[string]struct{}{"span": {}, "trace": {}},
+			keys,
+			"Expected to log span and trace IDs.",
+		)
+	})
+}
+
+func withTracedContext(f func(ctx context.Context)) {
+	tracer, closer := jaeger.NewTracer(
+		"serviceName", jaeger.NewConstSampler(true), jaeger.NewNullReporter(),
+	)
+	defer closer.Close()
+
+	ctx := opentracing.ContextWithSpan(context.Background(), tracer.StartSpan("test"))
+	f(ctx)
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/log/zap/logger.go

@@ -0,0 +1,39 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package zap
+
+import (
+	"go.uber.org/zap"
+)
+
+// Logger is an adapter from zap Logger to jaeger-lib Logger.
+type Logger struct {
+	logger *zap.SugaredLogger
+}
+
+// NewLogger creates a new Logger.
+func NewLogger(logger *zap.Logger) *Logger {
+	return &Logger{logger: logger.Sugar()}
+}
+
+// Error logs a message at error priority
+func (l *Logger) Error(msg string) {
+	l.logger.Error(msg)
+}
+
+// Infof logs a message at info priority
+func (l *Logger) Infof(msg string, args ...interface{}) {
+	l.logger.Infof(msg, args...)
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/log/zap/logger_test.go

@@ -0,0 +1,35 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package zap
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
+)
+
+func TestLogger(t *testing.T) {
+	buf := &bytes.Buffer{}
+	encoder := zapcore.NewConsoleEncoder(zapcore.EncoderConfig{MessageKey: "key"})
+	logger := NewLogger(zap.New(zapcore.NewCore(encoder, zapcore.AddSync(buf), zapcore.InfoLevel)))
+	logger.Infof("Hi %s %d", "there", 5)
+	assert.Equal(t, buf.String(), "Hi there 5\n")
+	buf.Reset()
+	logger.Error("Bad wolf")
+	assert.Equal(t, buf.String(), "Bad wolf\n")
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/logger.go

@@ -0,0 +1,53 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package jaeger
+
+import "log"
+
+// NB This will be deprecated in 3.0.0, please use jaeger-client-go/log/logger instead.
+
+// Logger provides an abstract interface for logging from Reporters.
+// Applications can provide their own implementation of this interface to adapt
+// reporters logging to whatever logging library they prefer (stdlib log,
+// logrus, go-logging, etc).
+type Logger interface {
+	// Error logs a message at error priority
+	Error(msg string)
+
+	// Infof logs a message at info priority
+	Infof(msg string, args ...interface{})
+}
+
+// StdLogger is implementation of the Logger interface that delegates to default `log` package
+var StdLogger = &stdLogger{}
+
+type stdLogger struct{}
+
+func (l *stdLogger) Error(msg string) {
+	log.Printf("ERROR: %s", msg)
+}
+
+// Infof logs a message at info priority
+func (l *stdLogger) Infof(msg string, args ...interface{}) {
+	log.Printf(msg, args...)
+}
+
+// NullLogger is implementation of the Logger interface that delegates to default `log` package
+var NullLogger = &nullLogger{}
+
+type nullLogger struct{}
+
+func (l *nullLogger) Error(msg string)                      {}
+func (l *nullLogger) Infof(msg string, args ...interface{}) {}

vendor/src/github.com/jaegertracing/jaeger-client-go/logger_test.go

@@ -0,0 +1,40 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package jaeger
+
+import (
+	"testing"
+
+	"github.com/uber/jaeger-client-go/log"
+)
+
+func TestLogger(t *testing.T) {
+	for _, logger := range []Logger{StdLogger, NullLogger} {
+		logger.Infof("Hi %s", "there")
+		logger.Error("Bad wolf")
+	}
+}
+
+func TestCompatibility(t *testing.T) {
+	for _, logger := range []log.Logger{StdLogger, NullLogger} {
+		logger.Infof("Hi %s", "there")
+		logger.Error("Bad wolf")
+	}
+
+	for _, logger := range []Logger{log.StdLogger, log.NullLogger} {
+		logger.Infof("Hi %s", "there")
+		logger.Error("Bad wolf")
+	}
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/metrics.go

@@ -0,0 +1,100 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package jaeger
+
+import (
+	"github.com/uber/jaeger-lib/metrics"
+)
+
+// Metrics is a container of all stats emitted by Jaeger tracer.
+type Metrics struct {
+	// Number of traces started by this tracer as sampled
+	TracesStartedSampled metrics.Counter `metric:"traces" tags:"state=started,sampled=y"`
+
+	// Number of traces started by this tracer as not sampled
+	TracesStartedNotSampled metrics.Counter `metric:"traces" tags:"state=started,sampled=n"`
+
+	// Number of externally started sampled traces this tracer joined
+	TracesJoinedSampled metrics.Counter `metric:"traces" tags:"state=joined,sampled=y"`
+
+	// Number of externally started not-sampled traces this tracer joined
+	TracesJoinedNotSampled metrics.Counter `metric:"traces" tags:"state=joined,sampled=n"`
+
+	// Number of sampled spans started by this tracer
+	SpansStarted metrics.Counter `metric:"spans" tags:"group=lifecycle,state=started"`
+
+	// Number of sampled spans finished by this tracer
+	SpansFinished metrics.Counter `metric:"spans" tags:"group=lifecycle,state=finished"`
+
+	// Number of sampled spans started by this tracer
+	SpansSampled metrics.Counter `metric:"spans" tags:"group=sampling,sampled=y"`
+
+	// Number of not-sampled spans started by this tracer
+	SpansNotSampled metrics.Counter `metric:"spans" tags:"group=sampling,sampled=n"`
+
+	// Number of errors decoding tracing context
+	DecodingErrors metrics.Counter `metric:"decoding-errors"`
+
+	// Number of spans successfully reported
+	ReporterSuccess metrics.Counter `metric:"reporter-spans" tags:"state=success"`
+
+	// Number of spans in failed attempts to report
+	ReporterFailure metrics.Counter `metric:"reporter-spans" tags:"state=failure"`
+
+	// Number of spans dropped due to internal queue overflow
+	ReporterDropped metrics.Counter `metric:"reporter-spans" tags:"state=dropped"`
+
+	// Current number of spans in the reporter queue
+	ReporterQueueLength metrics.Gauge `metric:"reporter-queue"`
+
+	// Number of times the Sampler succeeded to retrieve sampling strategy
+	SamplerRetrieved metrics.Counter `metric:"sampler" tags:"state=retrieved"`
+
+	// Number of times the Sampler succeeded to retrieve and update sampling strategy
+	SamplerUpdated metrics.Counter `metric:"sampler" tags:"state=updated"`
+
+	// Number of times the Sampler failed to update sampling strategy
+	SamplerUpdateFailure metrics.Counter `metric:"sampler" tags:"state=failure,phase=updating"`
+
+	// Number of times the Sampler failed to retrieve sampling strategy
+	SamplerQueryFailure metrics.Counter `metric:"sampler" tags:"state=failure,phase=query"`
+
+	// Number of times baggage was successfully written or updated on spans.
+	BaggageUpdateSuccess metrics.Counter `metric:"baggage-update" tags:"result=ok"`
+
+	// Number of times baggage failed to write or update on spans.
+	BaggageUpdateFailure metrics.Counter `metric:"baggage-update" tags:"result=err"`
+
+	// Number of times baggage was truncated as per baggage restrictions.
+	BaggageTruncate metrics.Counter `metric:"baggage-truncate"`
+
+	// Number of times baggage restrictions were successfully updated.
+	BaggageRestrictionsUpdateSuccess metrics.Counter `metric:"baggage-restrictions-update" tags:"result=ok"`
+
+	// Number of times baggage restrictions failed to update.
+	BaggageRestrictionsUpdateFailure metrics.Counter `metric:"baggage-restrictions-update" tags:"result=err"`
+}
+
+// NewMetrics creates a new Metrics struct and initializes it.
+func NewMetrics(factory metrics.Factory, globalTags map[string]string) *Metrics {
+	m := &Metrics{}
+	metrics.Init(m, factory.Namespace("jaeger", nil), globalTags)
+	return m
+}
+
+// NewNullMetrics creates a new Metrics struct that won't report any metrics.
+func NewNullMetrics() *Metrics {
+	return NewMetrics(metrics.NullFactory, nil)
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/metrics_test.go

@@ -0,0 +1,50 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package jaeger
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+	"github.com/uber/jaeger-lib/metrics"
+	"github.com/uber/jaeger-lib/metrics/testutils"
+)
+
+func TestNewMetrics(t *testing.T) {
+	tags := map[string]string{"lib": "jaeger"}
+
+	factory := metrics.NewLocalFactory(0)
+	m := NewMetrics(factory, tags)
+
+	require.NotNil(t, m.SpansSampled, "counter not initialized")
+	require.NotNil(t, m.ReporterQueueLength, "gauge not initialized")
+
+	m.SpansSampled.Inc(1)
+	m.ReporterQueueLength.Update(11)
+	testutils.AssertCounterMetrics(t, factory,
+		testutils.ExpectedMetric{
+			Name:  "jaeger.spans",
+			Tags:  map[string]string{"group": "sampling", "lib": "jaeger", "sampled": "y"},
+			Value: 1,
+		},
+	)
+	testutils.AssertGaugeMetrics(t, factory,
+		testutils.ExpectedMetric{
+			Name:  "jaeger.reporter-queue",
+			Tags:  map[string]string{"lib": "jaeger"},
+			Value: 11,
+		},
+	)
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/observer.go

@@ -0,0 +1,88 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package jaeger
+
+import opentracing "github.com/opentracing/opentracing-go"
+
+// Observer can be registered with the Tracer to receive notifications about
+// new Spans.
+//
+// Deprecated: use jaeger.ContribObserver instead.
+type Observer interface {
+	OnStartSpan(operationName string, options opentracing.StartSpanOptions) SpanObserver
+}
+
+// SpanObserver is created by the Observer and receives notifications about
+// other Span events.
+//
+// Deprecated: use jaeger.ContribSpanObserver instead.
+type SpanObserver interface {
+	OnSetOperationName(operationName string)
+	OnSetTag(key string, value interface{})
+	OnFinish(options opentracing.FinishOptions)
+}
+
+// compositeObserver is a dispatcher to other observers
+type compositeObserver struct {
+	observers []ContribObserver
+}
+
+// compositeSpanObserver is a dispatcher to other span observers
+type compositeSpanObserver struct {
+	observers []ContribSpanObserver
+}
+
+// noopSpanObserver is used when there are no observers registered
+// on the Tracer or none of them returns span observers from OnStartSpan.
+var noopSpanObserver = &compositeSpanObserver{}
+
+func (o *compositeObserver) append(contribObserver ContribObserver) {
+	o.observers = append(o.observers, contribObserver)
+}
+
+func (o *compositeObserver) OnStartSpan(sp opentracing.Span, operationName string, options opentracing.StartSpanOptions) ContribSpanObserver {
+	var spanObservers []ContribSpanObserver
+	for _, obs := range o.observers {
+		spanObs, ok := obs.OnStartSpan(sp, operationName, options)
+		if ok {
+			if spanObservers == nil {
+				spanObservers = make([]ContribSpanObserver, 0, len(o.observers))
+			}
+			spanObservers = append(spanObservers, spanObs)
+		}
+	}
+	if len(spanObservers) == 0 {
+		return noopSpanObserver
+	}
+	return &compositeSpanObserver{observers: spanObservers}
+}
+
+func (o *compositeSpanObserver) OnSetOperationName(operationName string) {
+	for _, obs := range o.observers {
+		obs.OnSetOperationName(operationName)
+	}
+}
+
+func (o *compositeSpanObserver) OnSetTag(key string, value interface{}) {
+	for _, obs := range o.observers {
+		obs.OnSetTag(key, value)
+	}
+}
+
+func (o *compositeSpanObserver) OnFinish(options opentracing.FinishOptions) {
+	for _, obs := range o.observers {
+		obs.OnFinish(options)
+	}
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/observer_test.go

@@ -0,0 +1,109 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package jaeger
+
+import (
+	"testing"
+
+	opentracing "github.com/opentracing/opentracing-go"
+	"github.com/opentracing/opentracing-go/ext"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestEmptyObserver(t *testing.T) {
+	tracer, closer := NewTracer("test", NewConstSampler(true), NewInMemoryReporter())
+	defer closer.Close()
+	s := tracer.StartSpan("test", ext.RPCServerOption(nil))
+	s.Finish()
+	assert.Equal(t, s.(*Span).observer, noopSpanObserver)
+}
+
+func TestObservers(t *testing.T) {
+	tracer, closer := NewTracer(
+		"test",
+		NewConstSampler(true),
+		NewInMemoryReporter(),
+		TracerOptions.Observer(testObserver{}),
+		TracerOptions.Observer(testObserver{}),
+	)
+	defer closer.Close()
+
+	s := tracer.StartSpan("test", ext.RPCServerOption(nil))
+
+	forEachObs := func(f func(so *testSpanObserver)) {
+		observers := s.(*Span).observer.(*compositeSpanObserver).observers
+		assert.Len(t, observers, 2)
+		for _, so := range observers {
+			f(so.(*testSpanObserver))
+		}
+	}
+
+	forEachObs(func(so *testSpanObserver) {
+		assert.Equal(t, testSpanObserver{
+			operationName: "test",
+			tags: map[string]interface{}{
+				"span.kind": ext.SpanKindRPCServerEnum,
+			},
+		}, *so)
+	})
+
+	s.SetOperationName("test2")
+	s.SetTag("bender", "rodriguez")
+	forEachObs(func(so *testSpanObserver) {
+		assert.Equal(t, testSpanObserver{
+			operationName: "test2",
+			tags: map[string]interface{}{
+				"span.kind": ext.SpanKindRPCServerEnum,
+				"bender":    "rodriguez",
+			},
+		}, *so)
+	})
+
+	s.Finish()
+	forEachObs(func(so *testSpanObserver) {
+		assert.True(t, so.finished)
+	})
+}
+
+type testObserver struct{}
+
+type testSpanObserver struct {
+	operationName string
+	tags          map[string]interface{}
+	finished      bool
+}
+
+func (o testObserver) OnStartSpan(operationName string, options opentracing.StartSpanOptions) SpanObserver {
+	tags := make(map[string]interface{})
+	for k, v := range options.Tags {
+		tags[k] = v
+	}
+	return &testSpanObserver{
+		operationName: operationName,
+		tags:          tags,
+	}
+}
+
+func (o *testSpanObserver) OnSetOperationName(operationName string) {
+	o.operationName = operationName
+}
+
+func (o *testSpanObserver) OnSetTag(key string, value interface{}) {
+	o.tags[key] = value
+}
+
+func (o *testSpanObserver) OnFinish(options opentracing.FinishOptions) {
+	o.finished = true
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/propagation.go

@@ -0,0 +1,300 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package jaeger
+
+import (
+	"bytes"
+	"encoding/binary"
+	"fmt"
+	"io"
+	"log"
+	"net/url"
+	"strings"
+	"sync"
+
+	opentracing "github.com/opentracing/opentracing-go"
+)
+
+// Injector is responsible for injecting SpanContext instances in a manner suitable
+// for propagation via a format-specific "carrier" object. Typically the
+// injection will take place across an RPC boundary, but message queues and
+// other IPC mechanisms are also reasonable places to use an Injector.
+type Injector interface {
+	// Inject takes `SpanContext` and injects it into `carrier`. The actual type
+	// of `carrier` depends on the `format` passed to `Tracer.Inject()`.
+	//
+	// Implementations may return opentracing.ErrInvalidCarrier or any other
+	// implementation-specific error if injection fails.
+	Inject(ctx SpanContext, carrier interface{}) error
+}
+
+// Extractor is responsible for extracting SpanContext instances from a
+// format-specific "carrier" object. Typically the extraction will take place
+// on the server side of an RPC boundary, but message queues and other IPC
+// mechanisms are also reasonable places to use an Extractor.
+type Extractor interface {
+	// Extract decodes a SpanContext instance from the given `carrier`,
+	// or (nil, opentracing.ErrSpanContextNotFound) if no context could
+	// be found in the `carrier`.
+	Extract(carrier interface{}) (SpanContext, error)
+}
+
+type textMapPropagator struct {
+	headerKeys  *HeadersConfig
+	metrics     Metrics
+	encodeValue func(string) string
+	decodeValue func(string) string
+}
+
+func newTextMapPropagator(headerKeys *HeadersConfig, metrics Metrics) *textMapPropagator {
+	return &textMapPropagator{
+		headerKeys: headerKeys,
+		metrics:    metrics,
+		encodeValue: func(val string) string {
+			return val
+		},
+		decodeValue: func(val string) string {
+			return val
+		},
+	}
+}
+
+func newHTTPHeaderPropagator(headerKeys *HeadersConfig, metrics Metrics) *textMapPropagator {
+	return &textMapPropagator{
+		headerKeys: headerKeys,
+		metrics:    metrics,
+		encodeValue: func(val string) string {
+			return url.QueryEscape(val)
+		},
+		decodeValue: func(val string) string {
+			// ignore decoding errors, cannot do anything about them
+			if v, err := url.QueryUnescape(val); err == nil {
+				return v
+			}
+			return val
+		},
+	}
+}
+
+type binaryPropagator struct {
+	tracer  *Tracer
+	buffers sync.Pool
+}
+
+func newBinaryPropagator(tracer *Tracer) *binaryPropagator {
+	return &binaryPropagator{
+		tracer:  tracer,
+		buffers: sync.Pool{New: func() interface{} { return &bytes.Buffer{} }},
+	}
+}
+
+func (p *textMapPropagator) Inject(
+	sc SpanContext,
+	abstractCarrier interface{},
+) error {
+	textMapWriter, ok := abstractCarrier.(opentracing.TextMapWriter)
+	if !ok {
+		return opentracing.ErrInvalidCarrier
+	}
+
+	// Do not encode the string with trace context to avoid accidental double-encoding
+	// if people are using opentracing < 0.10.0. Our colon-separated representation
+	// of the trace context is already safe for HTTP headers.
+	textMapWriter.Set(p.headerKeys.TraceContextHeaderName, sc.String())
+	for k, v := range sc.baggage {
+		safeKey := p.addBaggageKeyPrefix(k)
+		safeVal := p.encodeValue(v)
+		textMapWriter.Set(safeKey, safeVal)
+	}
+	return nil
+}
+
+func (p *textMapPropagator) Extract(abstractCarrier interface{}) (SpanContext, error) {
+	textMapReader, ok := abstractCarrier.(opentracing.TextMapReader)
+	if !ok {
+		return emptyContext, opentracing.ErrInvalidCarrier
+	}
+	var ctx SpanContext
+	var baggage map[string]string
+	err := textMapReader.ForeachKey(func(rawKey, value string) error {
+		key := strings.ToLower(rawKey) // TODO not necessary for plain TextMap
+		if key == p.headerKeys.TraceContextHeaderName {
+			var err error
+			safeVal := p.decodeValue(value)
+			if ctx, err = ContextFromString(safeVal); err != nil {
+				return err
+			}
+		} else if key == p.headerKeys.JaegerDebugHeader {
+			ctx.debugID = p.decodeValue(value)
+		} else if key == p.headerKeys.JaegerBaggageHeader {
+			if baggage == nil {
+				baggage = make(map[string]string)
+			}
+			for k, v := range p.parseCommaSeparatedMap(value) {
+				baggage[k] = v
+			}
+		} else if strings.HasPrefix(key, p.headerKeys.TraceBaggageHeaderPrefix) {
+			if baggage == nil {
+				baggage = make(map[string]string)
+			}
+			safeKey := p.removeBaggageKeyPrefix(key)
+			safeVal := p.decodeValue(value)
+			baggage[safeKey] = safeVal
+		}
+		return nil
+	})
+	if err != nil {
+		p.metrics.DecodingErrors.Inc(1)
+		return emptyContext, err
+	}
+	if !ctx.traceID.IsValid() && ctx.debugID == "" && len(baggage) == 0 {
+		return emptyContext, opentracing.ErrSpanContextNotFound
+	}
+	ctx.baggage = baggage
+	return ctx, nil
+}
+
+func (p *binaryPropagator) Inject(
+	sc SpanContext,
+	abstractCarrier interface{},
+) error {
+	carrier, ok := abstractCarrier.(io.Writer)
+	if !ok {
+		return opentracing.ErrInvalidCarrier
+	}
+
+	// Handle the tracer context
+	if err := binary.Write(carrier, binary.BigEndian, sc.traceID); err != nil {
+		return err
+	}
+	if err := binary.Write(carrier, binary.BigEndian, sc.spanID); err != nil {
+		return err
+	}
+	if err := binary.Write(carrier, binary.BigEndian, sc.parentID); err != nil {
+		return err
+	}
+	if err := binary.Write(carrier, binary.BigEndian, sc.flags); err != nil {
+		return err
+	}
+
+	// Handle the baggage items
+	if err := binary.Write(carrier, binary.BigEndian, int32(len(sc.baggage))); err != nil {
+		return err
+	}
+	for k, v := range sc.baggage {
+		if err := binary.Write(carrier, binary.BigEndian, int32(len(k))); err != nil {
+			return err
+		}
+		io.WriteString(carrier, k)
+		if err := binary.Write(carrier, binary.BigEndian, int32(len(v))); err != nil {
+			return err
+		}
+		io.WriteString(carrier, v)
+	}
+
+	return nil
+}
+
+func (p *binaryPropagator) Extract(abstractCarrier interface{}) (SpanContext, error) {
+	carrier, ok := abstractCarrier.(io.Reader)
+	if !ok {
+		return emptyContext, opentracing.ErrInvalidCarrier
+	}
+	var ctx SpanContext
+
+	if err := binary.Read(carrier, binary.BigEndian, &ctx.traceID); err != nil {
+		return emptyContext, opentracing.ErrSpanContextCorrupted
+	}
+	if err := binary.Read(carrier, binary.BigEndian, &ctx.spanID); err != nil {
+		return emptyContext, opentracing.ErrSpanContextCorrupted
+	}
+	if err := binary.Read(carrier, binary.BigEndian, &ctx.parentID); err != nil {
+		return emptyContext, opentracing.ErrSpanContextCorrupted
+	}
+	if err := binary.Read(carrier, binary.BigEndian, &ctx.flags); err != nil {
+		return emptyContext, opentracing.ErrSpanContextCorrupted
+	}
+
+	// Handle the baggage items
+	var numBaggage int32
+	if err := binary.Read(carrier, binary.BigEndian, &numBaggage); err != nil {
+		return emptyContext, opentracing.ErrSpanContextCorrupted
+	}
+	if iNumBaggage := int(numBaggage); iNumBaggage > 0 {
+		ctx.baggage = make(map[string]string, iNumBaggage)
+		buf := p.buffers.Get().(*bytes.Buffer)
+		defer p.buffers.Put(buf)
+
+		var keyLen, valLen int32
+		for i := 0; i < iNumBaggage; i++ {
+			if err := binary.Read(carrier, binary.BigEndian, &keyLen); err != nil {
+				return emptyContext, opentracing.ErrSpanContextCorrupted
+			}
+			buf.Reset()
+			buf.Grow(int(keyLen))
+			if n, err := io.CopyN(buf, carrier, int64(keyLen)); err != nil || int32(n) != keyLen {
+				return emptyContext, opentracing.ErrSpanContextCorrupted
+			}
+			key := buf.String()
+
+			if err := binary.Read(carrier, binary.BigEndian, &valLen); err != nil {
+				return emptyContext, opentracing.ErrSpanContextCorrupted
+			}
+			buf.Reset()
+			buf.Grow(int(valLen))
+			if n, err := io.CopyN(buf, carrier, int64(valLen)); err != nil || int32(n) != valLen {
+				return emptyContext, opentracing.ErrSpanContextCorrupted
+			}
+			ctx.baggage[key] = buf.String()
+		}
+	}
+
+	return ctx, nil
+}
+
+// Converts a comma separated key value pair list into a map
+// e.g. key1=value1, key2=value2, key3 = value3
+// is converted to map[string]string { "key1" : "value1",
+//                                     "key2" : "value2",
+//                                     "key3" : "value3" }
+func (p *textMapPropagator) parseCommaSeparatedMap(value string) map[string]string {
+	baggage := make(map[string]string)
+	value, err := url.QueryUnescape(value)
+	if err != nil {
+		log.Printf("Unable to unescape %s, %v", value, err)
+		return baggage
+	}
+	for _, kvpair := range strings.Split(value, ",") {
+		kv := strings.Split(strings.TrimSpace(kvpair), "=")
+		if len(kv) == 2 {
+			baggage[kv[0]] = kv[1]
+		} else {
+			log.Printf("Malformed value passed in for %s", p.headerKeys.JaegerBaggageHeader)
+		}
+	}
+	return baggage
+}
+
+// Converts a baggage item key into an http header format,
+// by prepending TraceBaggageHeaderPrefix and encoding the key string
+func (p *textMapPropagator) addBaggageKeyPrefix(key string) string {
+	// TODO encodeBaggageKeyAsHeader add caching and escaping
+	return fmt.Sprintf("%v%v", p.headerKeys.TraceBaggageHeaderPrefix, key)
+}
+
+func (p *textMapPropagator) removeBaggageKeyPrefix(key string) string {
+	// TODO decodeBaggageHeaderKey add caching and escaping
+	return key[len(p.headerKeys.TraceBaggageHeaderPrefix):]
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/propagation_test.go

@@ -0,0 +1,268 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package jaeger
+
+import (
+	"bytes"
+	"net/http"
+	"testing"
+	"time"
+
+	"github.com/opentracing/opentracing-go"
+	"github.com/opentracing/opentracing-go/ext"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"github.com/uber/jaeger-lib/metrics"
+	"github.com/uber/jaeger-lib/metrics/testutils"
+)
+
+func initMetrics() (*metrics.LocalFactory, *Metrics) {
+	factory := metrics.NewLocalFactory(0)
+	return factory, NewMetrics(factory, nil)
+}
+
+func TestSpanPropagator(t *testing.T) {
+	const op = "test"
+	reporter := NewInMemoryReporter()
+	metricsFactory, metrics := initMetrics()
+	tracer, closer := NewTracer("x", NewConstSampler(true), reporter, TracerOptions.Metrics(metrics), TracerOptions.ZipkinSharedRPCSpan(true))
+
+	mapc := opentracing.TextMapCarrier(make(map[string]string))
+	httpc := opentracing.HTTPHeadersCarrier(http.Header{})
+	tests := []struct {
+		format, carrier, formatName interface{}
+	}{
+		{SpanContextFormat, new(SpanContext), "TraceContextFormat"},
+		{opentracing.Binary, new(bytes.Buffer), "Binary"},
+		{opentracing.TextMap, mapc, "TextMap"},
+		{opentracing.HTTPHeaders, httpc, "HTTPHeaders"},
+	}
+
+	sp := tracer.StartSpan(op)
+	sp.SetTag("x", "y") // to avoid later comparing nil vs. []
+	sp.SetBaggageItem("foo", "bar")
+	for _, test := range tests {
+		// starting normal child to extract its serialized context
+		child := tracer.StartSpan(op, opentracing.ChildOf(sp.Context()))
+		err := tracer.Inject(child.Context(), test.format, test.carrier)
+		assert.NoError(t, err)
+		// Note: we're not finishing the above span
+		childCtx, err := tracer.Extract(test.format, test.carrier)
+		assert.NoError(t, err)
+		child = tracer.StartSpan(test.formatName.(string), ext.RPCServerOption(childCtx))
+		child.SetTag("x", "y") // to avoid later comparing nil vs. []
+		child.Finish()
+	}
+	sp.Finish()
+	closer.Close()
+
+	otSpans := reporter.GetSpans()
+	require.Equal(t, len(tests)+1, len(otSpans), "unexpected number of spans reporter")
+
+	spans := make([]*Span, len(otSpans))
+	for i, s := range otSpans {
+		spans[i] = s.(*Span)
+	}
+
+	// The last span is the original one.
+	exp, spans := spans[len(spans)-1], spans[:len(spans)-1]
+	exp.duration = time.Duration(123)
+	exp.startTime = time.Time{}.Add(1)
+	require.Len(t, exp.logs, 1) // The parent span should have baggage logs
+	fields := exp.logs[0].Fields
+	require.Len(t, fields, 3)
+	require.Equal(t, "event", fields[0].Key())
+	require.Equal(t, "baggage", fields[0].Value().(string))
+	require.Equal(t, "key", fields[1].Key())
+	require.Equal(t, "foo", fields[1].Value().(string))
+	require.Equal(t, "value", fields[2].Key())
+	require.Equal(t, "bar", fields[2].Value().(string))
+
+	if exp.context.ParentID() != 0 {
+		t.Fatalf("Root span's ParentID %d is not 0", exp.context.ParentID())
+	}
+
+	expTags := exp.tags[2:] // skip two sampler.xxx tags
+	for i, sp := range spans {
+		formatName := sp.operationName
+		if a, e := sp.context.ParentID(), exp.context.SpanID(); a != e {
+			t.Fatalf("%d: ParentID %d does not match expectation %d", i, a, e)
+		} else {
+			// Prepare for comparison.
+			sp.context.spanID, sp.context.parentID = exp.context.SpanID(), 0
+			sp.duration, sp.startTime = exp.duration, exp.startTime
+		}
+		assert.Equal(t, exp.context, sp.context, formatName)
+		assert.Equal(t, "span.kind", sp.tags[0].key)
+		assert.Equal(t, expTags, sp.tags[1:] /*skip span.kind tag*/, formatName)
+		assert.Empty(t, sp.logs, formatName)
+		// Override collections to avoid tripping comparison on different pointers
+		sp.context = exp.context
+		sp.tags = exp.tags
+		sp.logs = exp.logs
+		sp.operationName = op
+		sp.references = exp.references
+		// Compare the rest of the fields
+		assert.Equal(t, exp, sp, formatName)
+	}
+
+	testutils.AssertCounterMetrics(t, metricsFactory, []testutils.ExpectedMetric{
+		{Name: "jaeger.spans", Tags: map[string]string{"group": "sampling", "sampled": "y"}, Value: 1 + 2*len(tests)},
+		{Name: "jaeger.spans", Tags: map[string]string{"group": "lifecycle", "state": "started"}, Value: 1 + 2*len(tests)},
+		{Name: "jaeger.spans", Tags: map[string]string{"group": "lifecycle", "state": "finished"}, Value: 1 + len(tests)},
+		{Name: "jaeger.traces", Tags: map[string]string{"state": "started", "sampled": "y"}, Value: 1},
+		{Name: "jaeger.traces", Tags: map[string]string{"state": "joined", "sampled": "y"}, Value: len(tests)},
+	}...)
+}
+
+func TestSpanIntegrityAfterSerialize(t *testing.T) {
+	serializedString := "f6c385a2c57ed8d7:b04a90b7723bdc:76c385a2c57ed8d7:1"
+
+	context, err := ContextFromString(serializedString)
+	require.NoError(t, err)
+	require.True(t, context.traceID.Low > (uint64(1)<<63))
+	require.True(t, int64(context.traceID.Low) < 0)
+
+	newSerializedString := context.String()
+	require.Equal(t, serializedString, newSerializedString)
+}
+
+func TestDecodingError(t *testing.T) {
+	reporter := NewInMemoryReporter()
+	metricsFactory, metrics := initMetrics()
+	tracer, closer := NewTracer("x", NewConstSampler(true), reporter, TracerOptions.Metrics(metrics))
+	defer closer.Close()
+
+	badHeader := "x.x.x.x"
+	httpHeader := http.Header{}
+	httpHeader.Add(TraceContextHeaderName, badHeader)
+	tmc := opentracing.HTTPHeadersCarrier(httpHeader)
+	_, err := tracer.Extract(opentracing.HTTPHeaders, tmc)
+	assert.Error(t, err)
+
+	testutils.AssertCounterMetrics(t, metricsFactory, testutils.ExpectedMetric{Name: "jaeger.decoding-errors", Value: 1})
+}
+
+func TestBaggagePropagationHTTP(t *testing.T) {
+	tracer, closer := NewTracer("DOOP", NewConstSampler(true), NewNullReporter())
+	defer closer.Close()
+
+	sp1 := tracer.StartSpan("s1").(*Span)
+	sp1.SetBaggageItem("Some_Key", "12345")
+	assert.Equal(t, "12345", sp1.BaggageItem("Some_Key"), "baggage: %+v", sp1.context.baggage)
+	assert.Empty(t, sp1.BaggageItem("some-KEY"), "baggage: %+v", sp1.context.baggage)
+	sp1.SetBaggageItem("Some_Key", "98:765")
+	assert.Equal(t, "98:765", sp1.BaggageItem("Some_Key"), "baggage: %+v", sp1.context.baggage)
+	assert.Empty(t, sp1.BaggageItem("some-KEY"), "baggage: %+v", sp1.context.baggage)
+
+	h := http.Header{}
+	h.Add("header1", "value1") // make sure this does not get unmarshalled as baggage
+	err := tracer.Inject(sp1.Context(), opentracing.HTTPHeaders, opentracing.HTTPHeadersCarrier(h))
+	require.NoError(t, err)
+	// check that colon : was encoded as %3A
+	assert.Equal(t, "98%3A765", h.Get(TraceBaggageHeaderPrefix+"Some_Key"), "headers: %+v", h)
+
+	sp2, err := tracer.Extract(opentracing.HTTPHeaders, opentracing.HTTPHeadersCarrier(h))
+	require.NoError(t, err)
+	assert.Equal(t, map[string]string{"some_key": "98:765"}, sp2.(SpanContext).baggage)
+}
+
+func TestJaegerBaggageHeader(t *testing.T) {
+	metricsFactory, metrics := initMetrics()
+	tracer, closer := NewTracer("DOOP",
+		NewConstSampler(true),
+		NewNullReporter(),
+		TracerOptions.Metrics(metrics),
+	)
+	defer closer.Close()
+
+	h := http.Header{}
+	h.Add(JaegerBaggageHeader, "key1=value1, key 2=value two")
+
+	ctx, err := tracer.Extract(opentracing.HTTPHeaders, opentracing.HTTPHeadersCarrier(h))
+	require.NoError(t, err)
+
+	sp := tracer.StartSpan("root", opentracing.ChildOf(ctx)).(*Span)
+
+	assert.Equal(t, "value1", sp.BaggageItem("key1"))
+	assert.Equal(t, "value two", sp.BaggageItem("key 2"))
+
+	// ensure that traces.started counter is incremented, not traces.joined
+	testutils.AssertCounterMetrics(t, metricsFactory,
+		testutils.ExpectedMetric{
+			Name: "jaeger.traces", Tags: map[string]string{"state": "started", "sampled": "y"}, Value: 1,
+		},
+	)
+}
+
+func TestParseCommaSeperatedMap(t *testing.T) {
+	var testcases = []struct {
+		in  string
+		out map[string]string
+	}{
+		{"hobbit=Bilbo Baggins", map[string]string{"hobbit": "Bilbo Baggins"}},
+		{"hobbit=Bilbo Baggins, dwarf= Thrain", map[string]string{"hobbit": "Bilbo Baggins", "dwarf": " Thrain"}},
+		{"kevin spacey=actor", map[string]string{"kevin spacey": "actor"}},
+		{"kevin%20spacey=se7en%3Aactor", map[string]string{"kevin spacey": "se7en:actor"}},
+		{"key1=, key2=", map[string]string{"key1": "", "key2": ""}},
+		{"malformed", map[string]string{}},
+		{"malformed, string", map[string]string{}},
+		{"another malformed string", map[string]string{}},
+	}
+
+	for _, testcase := range testcases {
+		m := (&textMapPropagator{
+			headerKeys: getDefaultHeadersConfig(),
+		}).parseCommaSeparatedMap(testcase.in)
+		assert.Equal(t, testcase.out, m)
+	}
+}
+
+func TestDebugCorrelationID(t *testing.T) {
+	metricsFactory, metrics := initMetrics()
+	tracer, closer := NewTracer("DOOP",
+		NewConstSampler(true),
+		NewNullReporter(),
+		TracerOptions.Metrics(metrics),
+	)
+	defer closer.Close()
+
+	h := http.Header{}
+	h.Add(JaegerDebugHeader, "value1")
+	ctx, err := tracer.Extract(opentracing.HTTPHeaders, opentracing.HTTPHeadersCarrier(h))
+	require.NoError(t, err)
+	assert.EqualValues(t, 0, ctx.(SpanContext).parentID)
+	assert.EqualValues(t, "value1", ctx.(SpanContext).debugID)
+	sp := tracer.StartSpan("root", opentracing.ChildOf(ctx)).(*Span)
+	assert.EqualValues(t, 0, sp.context.parentID)
+	assert.True(t, sp.context.traceID.IsValid())
+	assert.True(t, sp.context.IsSampled())
+	assert.True(t, sp.context.IsDebug())
+	tagFound := false
+	for _, tag := range sp.tags {
+		if tag.key == JaegerDebugHeader {
+			assert.Equal(t, "value1", tag.value)
+			tagFound = true
+		}
+	}
+	assert.True(t, tagFound)
+
+	// ensure that traces.started counter is incremented, not traces.joined
+	testutils.AssertCounterMetrics(t, metricsFactory,
+		testutils.ExpectedMetric{
+			Name: "jaeger.traces", Tags: map[string]string{"state": "started", "sampled": "y"}, Value: 1,
+		},
+	)
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/reference.go

@@ -0,0 +1,23 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package jaeger
+
+import "github.com/opentracing/opentracing-go"
+
+// Reference represents a causal reference to other Spans (via their SpanContext).
+type Reference struct {
+	Type    opentracing.SpanReferenceType
+	Context SpanContext
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/reporter.go

@@ -0,0 +1,262 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package jaeger
+
+import (
+	"fmt"
+	"sync"
+	"sync/atomic"
+	"time"
+
+	"github.com/opentracing/opentracing-go"
+
+	"github.com/uber/jaeger-client-go/log"
+)
+
+// Reporter is called by the tracer when a span is completed to report the span to the tracing collector.
+type Reporter interface {
+	// Report submits a new span to collectors, possibly asynchronously and/or with buffering.
+	Report(span *Span)
+
+	// Close does a clean shutdown of the reporter, flushing any traces that may be buffered in memory.
+	Close()
+}
+
+// ------------------------------
+
+type nullReporter struct{}
+
+// NewNullReporter creates a no-op reporter that ignores all reported spans.
+func NewNullReporter() Reporter {
+	return &nullReporter{}
+}
+
+// Report implements Report() method of Reporter by doing nothing.
+func (r *nullReporter) Report(span *Span) {
+	// no-op
+}
+
+// Close implements Close() method of Reporter by doing nothing.
+func (r *nullReporter) Close() {
+	// no-op
+}
+
+// ------------------------------
+
+type loggingReporter struct {
+	logger Logger
+}
+
+// NewLoggingReporter creates a reporter that logs all reported spans to provided logger.
+func NewLoggingReporter(logger Logger) Reporter {
+	return &loggingReporter{logger}
+}
+
+// Report implements Report() method of Reporter by logging the span to the logger.
+func (r *loggingReporter) Report(span *Span) {
+	r.logger.Infof("Reporting span %+v", span)
+}
+
+// Close implements Close() method of Reporter by doing nothing.
+func (r *loggingReporter) Close() {
+	// no-op
+}
+
+// ------------------------------
+
+// InMemoryReporter is used for testing, and simply collects spans in memory.
+type InMemoryReporter struct {
+	spans []opentracing.Span
+	lock  sync.Mutex
+}
+
+// NewInMemoryReporter creates a reporter that stores spans in memory.
+// NOTE: the Tracer should be created with options.PoolSpans = false.
+func NewInMemoryReporter() *InMemoryReporter {
+	return &InMemoryReporter{
+		spans: make([]opentracing.Span, 0, 10),
+	}
+}
+
+// Report implements Report() method of Reporter by storing the span in the buffer.
+func (r *InMemoryReporter) Report(span *Span) {
+	r.lock.Lock()
+	r.spans = append(r.spans, span)
+	r.lock.Unlock()
+}
+
+// Close implements Close() method of Reporter by doing nothing.
+func (r *InMemoryReporter) Close() {
+	// no-op
+}
+
+// SpansSubmitted returns the number of spans accumulated in the buffer.
+func (r *InMemoryReporter) SpansSubmitted() int {
+	r.lock.Lock()
+	defer r.lock.Unlock()
+	return len(r.spans)
+}
+
+// GetSpans returns accumulated spans as a copy of the buffer.
+func (r *InMemoryReporter) GetSpans() []opentracing.Span {
+	r.lock.Lock()
+	defer r.lock.Unlock()
+	copied := make([]opentracing.Span, len(r.spans))
+	copy(copied, r.spans)
+	return copied
+}
+
+// Reset clears all accumulated spans.
+func (r *InMemoryReporter) Reset() {
+	r.lock.Lock()
+	defer r.lock.Unlock()
+	r.spans = nil
+}
+
+// ------------------------------
+
+type compositeReporter struct {
+	reporters []Reporter
+}
+
+// NewCompositeReporter creates a reporter that ignores all reported spans.
+func NewCompositeReporter(reporters ...Reporter) Reporter {
+	return &compositeReporter{reporters: reporters}
+}
+
+// Report implements Report() method of Reporter by delegating to each underlying reporter.
+func (r *compositeReporter) Report(span *Span) {
+	for _, reporter := range r.reporters {
+		reporter.Report(span)
+	}
+}
+
+// Close implements Close() method of Reporter by closing each underlying reporter.
+func (r *compositeReporter) Close() {
+	for _, reporter := range r.reporters {
+		reporter.Close()
+	}
+}
+
+// ------------------------------
+
+const (
+	defaultQueueSize           = 100
+	defaultBufferFlushInterval = 10 * time.Second
+)
+
+type remoteReporter struct {
+	// must be first in the struct because `sync/atomic` expects 64-bit alignment.
+	// Cf. https://github.com/uber/jaeger-client-go/issues/155, https://goo.gl/zW7dgq
+	queueLength int64
+
+	reporterOptions
+	sender       Transport
+	queue        chan *Span
+	queueDrained sync.WaitGroup
+	flushSignal  chan *sync.WaitGroup
+}
+
+// NewRemoteReporter creates a new reporter that sends spans out of process by means of Sender
+func NewRemoteReporter(sender Transport, opts ...ReporterOption) Reporter {
+	options := reporterOptions{}
+	for _, option := range opts {
+		option(&options)
+	}
+	if options.bufferFlushInterval <= 0 {
+		options.bufferFlushInterval = defaultBufferFlushInterval
+	}
+	if options.logger == nil {
+		options.logger = log.NullLogger
+	}
+	if options.metrics == nil {
+		options.metrics = NewNullMetrics()
+	}
+	if options.queueSize <= 0 {
+		options.queueSize = defaultQueueSize
+	}
+	reporter := &remoteReporter{
+		reporterOptions: options,
+		sender:          sender,
+		flushSignal:     make(chan *sync.WaitGroup),
+		queue:           make(chan *Span, options.queueSize),
+	}
+	go reporter.processQueue()
+	return reporter
+}
+
+// Report implements Report() method of Reporter.
+// It passes the span to a background go-routine for submission to Jaeger.
+func (r *remoteReporter) Report(span *Span) {
+	select {
+	case r.queue <- span:
+		atomic.AddInt64(&r.queueLength, 1)
+	default:
+		r.metrics.ReporterDropped.Inc(1)
+	}
+}
+
+// Close implements Close() method of Reporter by waiting for the queue to be drained.
+func (r *remoteReporter) Close() {
+	r.queueDrained.Add(1)
+	close(r.queue)
+	r.queueDrained.Wait()
+	r.sender.Close()
+}
+
+// processQueue reads spans from the queue, converts them to Thrift, and stores them in an internal buffer.
+// When the buffer length reaches batchSize, it is flushed by submitting the accumulated spans to Jaeger.
+// Buffer also gets flushed automatically every batchFlushInterval seconds, just in case the tracer stopped
+// reporting new spans.
+func (r *remoteReporter) processQueue() {
+	timer := time.NewTicker(r.bufferFlushInterval)
+	for {
+		select {
+		case span, ok := <-r.queue:
+			if ok {
+				atomic.AddInt64(&r.queueLength, -1)
+				if flushed, err := r.sender.Append(span); err != nil {
+					r.metrics.ReporterFailure.Inc(int64(flushed))
+					r.logger.Error(fmt.Sprintf("error reporting span %q: %s", span.OperationName(), err.Error()))
+				} else if flushed > 0 {
+					r.metrics.ReporterSuccess.Inc(int64(flushed))
+					// to reduce the number of gauge stats, we only emit queue length on flush
+					r.metrics.ReporterQueueLength.Update(atomic.LoadInt64(&r.queueLength))
+				}
+			} else {
+				// queue closed
+				timer.Stop()
+				r.flush()
+				r.queueDrained.Done()
+				return
+			}
+		case <-timer.C:
+			r.flush()
+		case wg := <-r.flushSignal: // for testing
+			r.flush()
+			wg.Done()
+		}
+	}
+}
+
+// flush causes the Sender to flush its accumulated spans and clear the buffer
+func (r *remoteReporter) flush() {
+	if flushed, err := r.sender.Flush(); err != nil {
+		r.metrics.ReporterFailure.Inc(int64(flushed))
+		r.logger.Error(err.Error())
+	} else if flushed > 0 {
+		r.metrics.ReporterSuccess.Inc(int64(flushed))
+	}
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/reporter_options.go

@@ -0,0 +1,69 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package jaeger
+
+import (
+	"time"
+)
+
+// ReporterOption is a function that sets some option on the reporter.
+type ReporterOption func(c *reporterOptions)
+
+// ReporterOptions is a factory for all available ReporterOption's
+var ReporterOptions reporterOptions
+
+// reporterOptions control behavior of the reporter.
+type reporterOptions struct {
+	// queueSize is the size of internal queue where reported spans are stored before they are processed in the background
+	queueSize int
+	// bufferFlushInterval is how often the buffer is force-flushed, even if it's not full
+	bufferFlushInterval time.Duration
+	// logger is used to log errors of span submissions
+	logger Logger
+	// metrics is used to record runtime stats
+	metrics *Metrics
+}
+
+// QueueSize creates a ReporterOption that sets the size of the internal queue where
+// spans are stored before they are processed.
+func (reporterOptions) QueueSize(queueSize int) ReporterOption {
+	return func(r *reporterOptions) {
+		r.queueSize = queueSize
+	}
+}
+
+// Metrics creates a ReporterOption that initializes Metrics in the reporter,
+// which is used to record runtime statistics.
+func (reporterOptions) Metrics(metrics *Metrics) ReporterOption {
+	return func(r *reporterOptions) {
+		r.metrics = metrics
+	}
+}
+
+// BufferFlushInterval creates a ReporterOption that sets how often the queue
+// is force-flushed.
+func (reporterOptions) BufferFlushInterval(bufferFlushInterval time.Duration) ReporterOption {
+	return func(r *reporterOptions) {
+		r.bufferFlushInterval = bufferFlushInterval
+	}
+}
+
+// Logger creates a ReporterOption that initializes the logger used to log
+// errors of span submissions.
+func (reporterOptions) Logger(logger Logger) ReporterOption {
+	return func(r *reporterOptions) {
+		r.logger = logger
+	}
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/reporter_test.go

@@ -0,0 +1,272 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package jaeger
+
+import (
+	"io"
+	"sort"
+	"strings"
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/opentracing/opentracing-go"
+	"github.com/opentracing/opentracing-go/ext"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"github.com/stretchr/testify/suite"
+	"github.com/uber/jaeger-lib/metrics"
+	mTestutils "github.com/uber/jaeger-lib/metrics/testutils"
+
+	"github.com/uber/jaeger-client-go/testutils"
+	j "github.com/uber/jaeger-client-go/thrift-gen/jaeger"
+)
+
+type reporterSuite struct {
+	suite.Suite
+	tracer         opentracing.Tracer
+	closer         io.Closer
+	serviceName    string
+	reporter       *remoteReporter
+	collector      *fakeSender
+	metricsFactory *metrics.LocalFactory
+}
+
+func (s *reporterSuite) SetupTest() {
+	s.metricsFactory = metrics.NewLocalFactory(0)
+	metrics := NewMetrics(s.metricsFactory, nil)
+	s.serviceName = "DOOP"
+	s.collector = &fakeSender{}
+	s.reporter = NewRemoteReporter(
+		s.collector, ReporterOptions.Metrics(metrics),
+	).(*remoteReporter)
+
+	s.tracer, s.closer = NewTracer(
+		"reporter-test-service",
+		NewConstSampler(true),
+		s.reporter,
+		TracerOptions.Metrics(metrics))
+	s.NotNil(s.tracer)
+}
+
+func (s *reporterSuite) TearDownTest() {
+	s.closer.Close()
+	s.tracer = nil
+	s.reporter = nil
+	s.collector = nil
+}
+
+func TestReporter(t *testing.T) {
+	suite.Run(t, new(reporterSuite))
+}
+
+func (s *reporterSuite) flushReporter() {
+	// Wait for reporter queue to add spans to buffer. We could've called reporter.Close(),
+	// but then it fails when the test suite calls close on it again (via tracer's Closer).
+	time.Sleep(5 * time.Millisecond)
+
+	var wg sync.WaitGroup
+	wg.Add(1)
+	s.reporter.flushSignal <- &wg
+	wg.Wait()
+}
+
+func (s *reporterSuite) TestRootSpanTags() {
+	s.metricsFactory.Clear()
+	sp := s.tracer.StartSpan("get_name")
+	ext.SpanKindRPCServer.Set(sp)
+	ext.PeerService.Set(sp, s.serviceName)
+	sp.Finish()
+	s.flushReporter()
+	s.Equal(1, len(s.collector.Spans()))
+	span := s.collector.Spans()[0]
+	s.Len(span.tags, 4)
+	s.EqualValues("server", span.tags[2].value, "span.kind should be server")
+
+	mTestutils.AssertCounterMetrics(s.T(), s.metricsFactory,
+		mTestutils.ExpectedMetric{
+			Name:  "jaeger.reporter-spans",
+			Tags:  map[string]string{"state": "success"},
+			Value: 1,
+		},
+	)
+}
+
+func (s *reporterSuite) TestClientSpan() {
+	s.metricsFactory.Clear()
+	sp := s.tracer.StartSpan("get_name")
+	ext.SpanKindRPCServer.Set(sp)
+	ext.PeerService.Set(sp, s.serviceName)
+	sp2 := s.tracer.StartSpan("get_last_name", opentracing.ChildOf(sp.Context()))
+	ext.SpanKindRPCClient.Set(sp2)
+	ext.PeerService.Set(sp2, s.serviceName)
+	sp2.Finish()
+	sp.Finish()
+	s.flushReporter()
+	s.Equal(2, len(s.collector.Spans()))
+	span := s.collector.Spans()[0] // child span is reported first
+	s.EqualValues(span.context.spanID, sp2.(*Span).context.spanID)
+	s.Len(span.tags, 2)
+	s.EqualValues("client", span.tags[0].value, "span.kind should be client")
+
+	mTestutils.AssertCounterMetrics(s.T(), s.metricsFactory,
+		mTestutils.ExpectedMetric{
+			Name:  "jaeger.reporter-spans",
+			Tags:  map[string]string{"state": "success"},
+			Value: 2,
+		},
+	)
+}
+
+func (s *reporterSuite) TestTagsAndEvents() {
+	sp := s.tracer.StartSpan("get_name")
+	sp.LogEvent("hello")
+	sp.LogEvent(strings.Repeat("long event ", 30))
+	expected := []string{"long", "ping", "awake", "awake", "one", "two", "three", "bite me",
+		SamplerParamTagKey, SamplerTypeTagKey, "does not compute"}
+	sp.SetTag("long", strings.Repeat("x", 300))
+	sp.SetTag("ping", "pong")
+	sp.SetTag("awake", true)
+	sp.SetTag("awake", false)
+	sp.SetTag("one", 1)
+	sp.SetTag("two", int32(2))
+	sp.SetTag("three", int64(3))
+	sp.SetTag("bite me", []byte{1})
+	sp.SetTag("does not compute", sp) // should be converted to string
+	sp.Finish()
+	s.flushReporter()
+	s.Equal(1, len(s.collector.Spans()))
+	span := s.collector.Spans()[0]
+	s.Equal(2, len(span.logs), "expecting two logs")
+	s.Equal(len(expected), len(span.tags),
+		"expecting %d tags", len(expected))
+	tags := []string{}
+	for _, tag := range span.tags {
+		tags = append(tags, string(tag.key))
+	}
+	sort.Strings(expected)
+	sort.Strings(tags)
+	s.Equal(expected, tags, "expecting %d tags", len(expected))
+
+	s.NotNil(findDomainLog(span, "hello"), "expecting 'hello' log: %+v", span.logs)
+}
+
+func TestUDPReporter(t *testing.T) {
+	agent, err := testutils.StartMockAgent()
+	require.NoError(t, err)
+	defer agent.Close()
+
+	testRemoteReporter(t,
+		func(m *Metrics) (Transport, error) {
+			return NewUDPTransport(agent.SpanServerAddr(), 0)
+		},
+		func() []*j.Batch {
+			return agent.GetJaegerBatches()
+		})
+}
+
+func testRemoteReporter(
+	t *testing.T,
+	factory func(m *Metrics) (Transport, error),
+	getBatches func() []*j.Batch,
+) {
+	metricsFactory := metrics.NewLocalFactory(0)
+	metrics := NewMetrics(metricsFactory, nil)
+
+	sender, err := factory(metrics)
+	require.NoError(t, err)
+	reporter := NewRemoteReporter(sender, ReporterOptions.Metrics(metrics)).(*remoteReporter)
+
+	tracer, closer := NewTracer(
+		"reporter-test-service",
+		NewConstSampler(true),
+		reporter,
+		TracerOptions.Metrics(metrics))
+
+	span := tracer.StartSpan("leela")
+	ext.SpanKindRPCClient.Set(span)
+	ext.PeerService.Set(span, "downstream")
+	span.Finish()
+	closer.Close() // close the tracer, which also closes and flushes the reporter
+	// however, in case of UDP reporter it's fire and forget, so we need to wait a bit
+	time.Sleep(5 * time.Millisecond)
+
+	batches := getBatches()
+	require.Equal(t, 1, len(batches))
+	require.Equal(t, 1, len(batches[0].Spans))
+	assert.Equal(t, "leela", batches[0].Spans[0].OperationName)
+	assert.Equal(t, "reporter-test-service", batches[0].Process.ServiceName)
+	tag := findJaegerTag("peer.service", batches[0].Spans[0].Tags)
+	assert.NotNil(t, tag)
+	assert.Equal(t, "downstream", *tag.VStr)
+
+	mTestutils.AssertCounterMetrics(t, metricsFactory, []mTestutils.ExpectedMetric{
+		{Name: "jaeger.reporter-spans", Tags: map[string]string{"state": "success"}, Value: 1},
+		{Name: "jaeger.reporter-spans", Tags: map[string]string{"state": "failure"}, Value: 0},
+	}...)
+}
+
+func (s *reporterSuite) TestMemoryReporterReport() {
+	sp := s.tracer.StartSpan("leela")
+	ext.PeerService.Set(sp, s.serviceName)
+	reporter := NewInMemoryReporter()
+	reporter.Report(sp.(*Span))
+	s.Equal(1, reporter.SpansSubmitted(), "expected number of spans submitted")
+	reporter.Close()
+}
+
+type fakeSender struct {
+	spans []*Span
+	mutex sync.Mutex
+}
+
+func (s *fakeSender) Append(span *Span) (int, error) {
+	s.mutex.Lock()
+	defer s.mutex.Unlock()
+	s.spans = append(s.spans, span)
+	return 1, nil
+}
+
+func (s *fakeSender) Flush() (int, error) {
+	return 0, nil
+}
+
+func (s *fakeSender) Close() error { return nil }
+
+func (s *fakeSender) Spans() []*Span {
+	s.mutex.Lock()
+	defer s.mutex.Unlock()
+	res := make([]*Span, len(s.spans))
+	copy(res, s.spans)
+	return res
+}
+
+func findDomainLog(span *Span, key string) *opentracing.LogRecord {
+	for _, log := range span.logs {
+		if log.Fields[0].Value().(string) == key {
+			return &log
+		}
+	}
+	return nil
+}
+
+func findDomainTag(span *Span, key string) *Tag {
+	for _, tag := range span.tags {
+		if tag.key == key {
+			return &tag
+		}
+	}
+	return nil
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/rpcmetrics/README.md

@@ -0,0 +1,5 @@
+An Observer that can be used to emit RPC metrics
+================================================
+
+It can be attached to the tracer during tracer construction.
+See `ExampleObserver` function in [observer_test.go](./observer_test.go).

vendor/src/github.com/jaegertracing/jaeger-client-go/rpcmetrics/doc.go

@@ -0,0 +1,16 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package rpcmetrics implements an Observer that can be used to emit RPC metrics.
+package rpcmetrics

vendor/src/github.com/jaegertracing/jaeger-client-go/rpcmetrics/endpoints.go

@@ -0,0 +1,63 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package rpcmetrics
+
+import "sync"
+
+// normalizedEndpoints is a cache for endpointName -> safeName mappings.
+type normalizedEndpoints struct {
+	names       map[string]string
+	maxSize     int
+	defaultName string
+	normalizer  NameNormalizer
+	mux         sync.RWMutex
+}
+
+func newNormalizedEndpoints(maxSize int, normalizer NameNormalizer) *normalizedEndpoints {
+	return &normalizedEndpoints{
+		maxSize:    maxSize,
+		normalizer: normalizer,
+		names:      make(map[string]string, maxSize),
+	}
+}
+
+// normalize looks up the name in the cache, if not found it uses normalizer
+// to convert the name to a safe name. If called with more than maxSize unique
+// names it returns "" for all other names beyond those already cached.
+func (n *normalizedEndpoints) normalize(name string) string {
+	n.mux.RLock()
+	norm, ok := n.names[name]
+	l := len(n.names)
+	n.mux.RUnlock()
+	if ok {
+		return norm
+	}
+	if l >= n.maxSize {
+		return ""
+	}
+	return n.normalizeWithLock(name)
+}
+
+func (n *normalizedEndpoints) normalizeWithLock(name string) string {
+	norm := n.normalizer.Normalize(name)
+	n.mux.Lock()
+	defer n.mux.Unlock()
+	// cache may have grown while we were not holding the lock
+	if len(n.names) >= n.maxSize {
+		return ""
+	}
+	n.names[name] = norm
+	return norm
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/rpcmetrics/endpoints_test.go

@@ -0,0 +1,43 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package rpcmetrics
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestNormalizedEndpoints(t *testing.T) {
+	n := newNormalizedEndpoints(1, DefaultNameNormalizer)
+
+	assertLen := func(l int) {
+		n.mux.RLock()
+		defer n.mux.RUnlock()
+		assert.Len(t, n.names, l)
+	}
+
+	assert.Equal(t, "ab-cd", n.normalize("ab^cd"), "one translation")
+	assert.Equal(t, "ab-cd", n.normalize("ab^cd"), "cache hit")
+	assertLen(1)
+	assert.Equal(t, "", n.normalize("xys"), "cache overflow")
+	assertLen(1)
+}
+
+func TestNormalizedEndpointsDoubleLocking(t *testing.T) {
+	n := newNormalizedEndpoints(1, DefaultNameNormalizer)
+	assert.Equal(t, "ab-cd", n.normalize("ab^cd"), "fill out the cache")
+	assert.Equal(t, "", n.normalizeWithLock("xys"), "cache overflow")
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/rpcmetrics/metrics.go

@@ -0,0 +1,124 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package rpcmetrics
+
+import (
+	"sync"
+
+	"github.com/uber/jaeger-lib/metrics"
+)
+
+const (
+	otherEndpointsPlaceholder = "other"
+	endpointNameMetricTag     = "endpoint"
+)
+
+// Metrics is a collection of metrics for an endpoint describing
+// throughput, success, errors, and performance.
+type Metrics struct {
+	// RequestCountSuccess is a counter of the total number of successes.
+	RequestCountSuccess metrics.Counter `metric:"requests" tags:"error=false"`
+
+	// RequestCountFailures is a counter of the number of times any failure has been observed.
+	RequestCountFailures metrics.Counter `metric:"requests" tags:"error=true"`
+
+	// RequestLatencySuccess is a latency histogram of succesful requests.
+	RequestLatencySuccess metrics.Timer `metric:"request_latency" tags:"error=false"`
+
+	// RequestLatencyFailures is a latency histogram of failed requests.
+	RequestLatencyFailures metrics.Timer `metric:"request_latency" tags:"error=true"`
+
+	// HTTPStatusCode2xx is a counter of the total number of requests with HTTP status code 200-299
+	HTTPStatusCode2xx metrics.Counter `metric:"http_requests" tags:"status_code=2xx"`
+
+	// HTTPStatusCode3xx is a counter of the total number of requests with HTTP status code 300-399
+	HTTPStatusCode3xx metrics.Counter `metric:"http_requests" tags:"status_code=3xx"`
+
+	// HTTPStatusCode4xx is a counter of the total number of requests with HTTP status code 400-499
+	HTTPStatusCode4xx metrics.Counter `metric:"http_requests" tags:"status_code=4xx"`
+
+	// HTTPStatusCode5xx is a counter of the total number of requests with HTTP status code 500-599
+	HTTPStatusCode5xx metrics.Counter `metric:"http_requests" tags:"status_code=5xx"`
+}
+
+func (m *Metrics) recordHTTPStatusCode(statusCode uint16) {
+	if statusCode >= 200 && statusCode < 300 {
+		m.HTTPStatusCode2xx.Inc(1)
+	} else if statusCode >= 300 && statusCode < 400 {
+		m.HTTPStatusCode3xx.Inc(1)
+	} else if statusCode >= 400 && statusCode < 500 {
+		m.HTTPStatusCode4xx.Inc(1)
+	} else if statusCode >= 500 && statusCode < 600 {
+		m.HTTPStatusCode5xx.Inc(1)
+	}
+}
+
+// MetricsByEndpoint is a registry/cache of metrics for each unique endpoint name.
+// Only maxNumberOfEndpoints Metrics are stored, all other endpoint names are mapped
+// to a generic endpoint name "other".
+type MetricsByEndpoint struct {
+	metricsFactory    metrics.Factory
+	endpoints         *normalizedEndpoints
+	metricsByEndpoint map[string]*Metrics
+	mux               sync.RWMutex
+}
+
+func newMetricsByEndpoint(
+	metricsFactory metrics.Factory,
+	normalizer NameNormalizer,
+	maxNumberOfEndpoints int,
+) *MetricsByEndpoint {
+	return &MetricsByEndpoint{
+		metricsFactory:    metricsFactory,
+		endpoints:         newNormalizedEndpoints(maxNumberOfEndpoints, normalizer),
+		metricsByEndpoint: make(map[string]*Metrics, maxNumberOfEndpoints+1), // +1 for "other"
+	}
+}
+
+func (m *MetricsByEndpoint) get(endpoint string) *Metrics {
+	safeName := m.endpoints.normalize(endpoint)
+	if safeName == "" {
+		safeName = otherEndpointsPlaceholder
+	}
+	m.mux.RLock()
+	met := m.metricsByEndpoint[safeName]
+	m.mux.RUnlock()
+	if met != nil {
+		return met
+	}
+
+	return m.getWithWriteLock(safeName)
+}
+
+// split to make easier to test
+func (m *MetricsByEndpoint) getWithWriteLock(safeName string) *Metrics {
+	m.mux.Lock()
+	defer m.mux.Unlock()
+
+	// it is possible that the name has been already registered after we released
+	// the read lock and before we grabbed the write lock, so check for that.
+	if met, ok := m.metricsByEndpoint[safeName]; ok {
+		return met
+	}
+
+	// it would be nice to create the struct before locking, since Init() is somewhat
+	// expensive, however some metrics backends (e.g. expvar) may not like duplicate metrics.
+	met := &Metrics{}
+	tags := map[string]string{endpointNameMetricTag: safeName}
+	metrics.Init(met, m.metricsFactory, tags)
+
+	m.metricsByEndpoint[safeName] = met
+	return met
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/rpcmetrics/metrics_test.go

@@ -0,0 +1,61 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package rpcmetrics
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/uber/jaeger-lib/metrics"
+	"github.com/uber/jaeger-lib/metrics/testutils"
+)
+
+// E.g. tags("key", "value", "key", "value")
+func tags(kv ...string) map[string]string {
+	m := make(map[string]string)
+	for i := 0; i < len(kv)-1; i += 2 {
+		m[kv[i]] = kv[i+1]
+	}
+	return m
+}
+
+func endpointTags(endpoint string, kv ...string) map[string]string {
+	return tags(append([]string{"endpoint", endpoint}, kv...)...)
+}
+
+func TestMetricsByEndpoint(t *testing.T) {
+	met := metrics.NewLocalFactory(0)
+	mbe := newMetricsByEndpoint(met, DefaultNameNormalizer, 2)
+
+	m1 := mbe.get("abc1")
+	m2 := mbe.get("abc1")               // from cache
+	m2a := mbe.getWithWriteLock("abc1") // from cache in double-checked lock
+	assert.Equal(t, m1, m2)
+	assert.Equal(t, m1, m2a)
+
+	m3 := mbe.get("abc3")
+	m4 := mbe.get("overflow")
+	m5 := mbe.get("overflow2")
+
+	for _, m := range []*Metrics{m1, m2, m2a, m3, m4, m5} {
+		m.RequestCountSuccess.Inc(1)
+	}
+
+	testutils.AssertCounterMetrics(t, met,
+		testutils.ExpectedMetric{Name: "requests", Tags: endpointTags("abc1", "error", "false"), Value: 3},
+		testutils.ExpectedMetric{Name: "requests", Tags: endpointTags("abc3", "error", "false"), Value: 1},
+		testutils.ExpectedMetric{Name: "requests", Tags: endpointTags("other", "error", "false"), Value: 2},
+	)
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/rpcmetrics/normalizer.go

@@ -0,0 +1,101 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package rpcmetrics
+
+// NameNormalizer is used to convert the endpoint names to strings
+// that can be safely used as tags in the metrics.
+type NameNormalizer interface {
+	Normalize(name string) string
+}
+
+// DefaultNameNormalizer converts endpoint names so that they contain only characters
+// from the safe charset [a-zA-Z0-9-./_]. All other characters are replaced with '-'.
+var DefaultNameNormalizer = &SimpleNameNormalizer{
+	SafeSets: []SafeCharacterSet{
+		&Range{From: 'a', To: 'z'},
+		&Range{From: 'A', To: 'Z'},
+		&Range{From: '0', To: '9'},
+		&Char{'-'},
+		&Char{'_'},
+		&Char{'/'},
+		&Char{'.'},
+	},
+	Replacement: '-',
+}
+
+// SimpleNameNormalizer uses a set of safe character sets.
+type SimpleNameNormalizer struct {
+	SafeSets    []SafeCharacterSet
+	Replacement byte
+}
+
+// SafeCharacterSet determines if the given character is "safe"
+type SafeCharacterSet interface {
+	IsSafe(c byte) bool
+}
+
+// Range implements SafeCharacterSet
+type Range struct {
+	From, To byte
+}
+
+// IsSafe implements SafeCharacterSet
+func (r *Range) IsSafe(c byte) bool {
+	return c >= r.From && c <= r.To
+}
+
+// Char implements SafeCharacterSet
+type Char struct {
+	Val byte
+}
+
+// IsSafe implements SafeCharacterSet
+func (ch *Char) IsSafe(c byte) bool {
+	return c == ch.Val
+}
+
+// Normalize checks each character in the string against SafeSets,
+// and if it's not safe substitutes it with Replacement.
+func (n *SimpleNameNormalizer) Normalize(name string) string {
+	var retMe []byte
+	nameBytes := []byte(name)
+	for i, b := range nameBytes {
+		if n.safeByte(b) {
+			if retMe != nil {
+				retMe[i] = b
+			}
+		} else {
+			if retMe == nil {
+				retMe = make([]byte, len(nameBytes))
+				copy(retMe[0:i], nameBytes[0:i])
+			}
+			retMe[i] = n.Replacement
+		}
+	}
+	if retMe == nil {
+		return name
+	}
+	return string(retMe)
+}
+
+// safeByte checks if b against all safe charsets.
+func (n *SimpleNameNormalizer) safeByte(b byte) bool {
+	for i := range n.SafeSets {
+		if n.SafeSets[i].IsSafe(b) {
+			return true
+		}
+	}
+	return false
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/rpcmetrics/normalizer_test.go

@@ -0,0 +1,34 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package rpcmetrics
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestSimpleNameNormalizer(t *testing.T) {
+	n := &SimpleNameNormalizer{
+		SafeSets: []SafeCharacterSet{
+			&Range{From: 'a', To: 'z'},
+			&Char{'-'},
+		},
+		Replacement: '-',
+	}
+	assert.Equal(t, "ab-cd", n.Normalize("ab-cd"), "all valid")
+	assert.Equal(t, "ab-cd", n.Normalize("ab.cd"), "single mismatch")
+	assert.Equal(t, "a--cd", n.Normalize("aB-cd"), "range letter mismatch")
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/rpcmetrics/observer.go

@@ -0,0 +1,171 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package rpcmetrics
+
+import (
+	"strconv"
+	"sync"
+	"time"
+
+	"github.com/opentracing/opentracing-go"
+	"github.com/opentracing/opentracing-go/ext"
+	"github.com/uber/jaeger-lib/metrics"
+
+	jaeger "github.com/uber/jaeger-client-go"
+)
+
+const defaultMaxNumberOfEndpoints = 200
+
+// Observer is an observer that can emit RPC metrics.
+type Observer struct {
+	metricsByEndpoint *MetricsByEndpoint
+}
+
+// NewObserver creates a new observer that can emit RPC metrics.
+func NewObserver(metricsFactory metrics.Factory, normalizer NameNormalizer) *Observer {
+	return &Observer{
+		metricsByEndpoint: newMetricsByEndpoint(
+			metricsFactory,
+			normalizer,
+			defaultMaxNumberOfEndpoints,
+		),
+	}
+}
+
+// OnStartSpan creates a new Observer for the span.
+func (o *Observer) OnStartSpan(
+	operationName string,
+	options opentracing.StartSpanOptions,
+) jaeger.SpanObserver {
+	return NewSpanObserver(o.metricsByEndpoint, operationName, options)
+}
+
+// SpanKind identifies the span as inboud, outbound, or internal
+type SpanKind int
+
+const (
+	// Local span kind
+	Local SpanKind = iota
+	// Inbound span kind
+	Inbound
+	// Outbound span kind
+	Outbound
+)
+
+// SpanObserver collects RPC metrics
+type SpanObserver struct {
+	metricsByEndpoint *MetricsByEndpoint
+	operationName     string
+	startTime         time.Time
+	mux               sync.Mutex
+	kind              SpanKind
+	httpStatusCode    uint16
+	err               bool
+}
+
+// NewSpanObserver creates a new SpanObserver that can emit RPC metrics.
+func NewSpanObserver(
+	metricsByEndpoint *MetricsByEndpoint,
+	operationName string,
+	options opentracing.StartSpanOptions,
+) *SpanObserver {
+	so := &SpanObserver{
+		metricsByEndpoint: metricsByEndpoint,
+		operationName:     operationName,
+		startTime:         options.StartTime,
+	}
+	for k, v := range options.Tags {
+		so.handleTagInLock(k, v)
+	}
+	return so
+}
+
+// handleTags watches for special tags
+// - SpanKind
+// - HttpStatusCode
+// - Error
+func (so *SpanObserver) handleTagInLock(key string, value interface{}) {
+	if key == string(ext.SpanKind) {
+		if v, ok := value.(ext.SpanKindEnum); ok {
+			value = string(v)
+		}
+		if v, ok := value.(string); ok {
+			if v == string(ext.SpanKindRPCClientEnum) {
+				so.kind = Outbound
+			} else if v == string(ext.SpanKindRPCServerEnum) {
+				so.kind = Inbound
+			}
+		}
+		return
+	}
+	if key == string(ext.HTTPStatusCode) {
+		if v, ok := value.(uint16); ok {
+			so.httpStatusCode = v
+		} else if v, ok := value.(int); ok {
+			so.httpStatusCode = uint16(v)
+		} else if v, ok := value.(string); ok {
+			if vv, err := strconv.Atoi(v); err == nil {
+				so.httpStatusCode = uint16(vv)
+			}
+		}
+		return
+	}
+	if key == string(ext.Error) {
+		if v, ok := value.(bool); ok {
+			so.err = v
+		} else if v, ok := value.(string); ok {
+			if vv, err := strconv.ParseBool(v); err == nil {
+				so.err = vv
+			}
+		}
+		return
+	}
+}
+
+// OnFinish emits the RPC metrics. It only has an effect when operation name
+// is not blank, and the span kind is an RPC server.
+func (so *SpanObserver) OnFinish(options opentracing.FinishOptions) {
+	so.mux.Lock()
+	defer so.mux.Unlock()
+
+	if so.operationName == "" || so.kind != Inbound {
+		return
+	}
+
+	mets := so.metricsByEndpoint.get(so.operationName)
+	latency := options.FinishTime.Sub(so.startTime)
+	if so.err {
+		mets.RequestCountFailures.Inc(1)
+		mets.RequestLatencyFailures.Record(latency)
+	} else {
+		mets.RequestCountSuccess.Inc(1)
+		mets.RequestLatencySuccess.Record(latency)
+	}
+	mets.recordHTTPStatusCode(so.httpStatusCode)
+}
+
+// OnSetOperationName records new operation name.
+func (so *SpanObserver) OnSetOperationName(operationName string) {
+	so.mux.Lock()
+	so.operationName = operationName
+	so.mux.Unlock()
+}
+
+// OnSetTag implements SpanObserver
+func (so *SpanObserver) OnSetTag(key string, value interface{}) {
+	so.mux.Lock()
+	so.handleTagInLock(key, value)
+	so.mux.Unlock()
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/rpcmetrics/observer_test.go

@@ -0,0 +1,177 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package rpcmetrics
+
+import (
+	"fmt"
+	"testing"
+	"time"
+
+	opentracing "github.com/opentracing/opentracing-go"
+	"github.com/stretchr/testify/assert"
+	"github.com/uber/jaeger-lib/metrics"
+	u "github.com/uber/jaeger-lib/metrics/testutils"
+
+	"github.com/opentracing/opentracing-go/ext"
+	jaeger "github.com/uber/jaeger-client-go"
+)
+
+func ExampleObserver() {
+	metricsFactory := metrics.NewLocalFactory(0)
+	metricsObserver := NewObserver(
+		metricsFactory,
+		DefaultNameNormalizer,
+	)
+	tracer, closer := jaeger.NewTracer(
+		"serviceName",
+		jaeger.NewConstSampler(true),
+		jaeger.NewInMemoryReporter(),
+		jaeger.TracerOptions.Observer(metricsObserver),
+	)
+	defer closer.Close()
+
+	span := tracer.StartSpan("test", ext.SpanKindRPCServer)
+	span.Finish()
+
+	c, _ := metricsFactory.Snapshot()
+	fmt.Printf("requests (success): %d\n", c["requests|endpoint=test|error=false"])
+	fmt.Printf("requests (failure): %d\n", c["requests|endpoint=test|error=true"])
+	// Output:
+	// requests (success): 1
+	// requests (failure): 0
+}
+
+type testTracer struct {
+	metrics *metrics.LocalFactory
+	tracer  opentracing.Tracer
+}
+
+func withTestTracer(runTest func(tt *testTracer)) {
+	sampler := jaeger.NewConstSampler(true)
+	reporter := jaeger.NewInMemoryReporter()
+	metrics := metrics.NewLocalFactory(time.Minute)
+	observer := NewObserver(metrics, DefaultNameNormalizer)
+	tracer, closer := jaeger.NewTracer(
+		"test",
+		sampler,
+		reporter,
+		jaeger.TracerOptions.Observer(observer))
+	defer closer.Close()
+	runTest(&testTracer{
+		metrics: metrics,
+		tracer:  tracer,
+	})
+}
+
+func TestObserver(t *testing.T) {
+	withTestTracer(func(testTracer *testTracer) {
+		ts := time.Now()
+		finishOptions := opentracing.FinishOptions{
+			FinishTime: ts.Add(50 * time.Millisecond),
+		}
+
+		testCases := []struct {
+			name           string
+			tag            opentracing.Tag
+			opNameOverride string
+			err            bool
+		}{
+			{name: "local-span", tag: opentracing.Tag{Key: "x", Value: "y"}},
+			{name: "get-user", tag: ext.SpanKindRPCServer},
+			{name: "get-user", tag: ext.SpanKindRPCServer, opNameOverride: "get-user-override"},
+			{name: "get-user", tag: ext.SpanKindRPCServer, err: true},
+			{name: "get-user-client", tag: ext.SpanKindRPCClient},
+		}
+
+		for _, testCase := range testCases {
+			span := testTracer.tracer.StartSpan(
+				testCase.name,
+				testCase.tag,
+				opentracing.StartTime(ts),
+			)
+			if testCase.opNameOverride != "" {
+				span.SetOperationName(testCase.opNameOverride)
+			}
+			if testCase.err {
+				ext.Error.Set(span, true)
+			}
+			span.FinishWithOptions(finishOptions)
+		}
+
+		u.AssertCounterMetrics(t,
+			testTracer.metrics,
+			u.ExpectedMetric{Name: "requests", Tags: endpointTags("local-span", "error", "false"), Value: 0},
+			u.ExpectedMetric{Name: "requests", Tags: endpointTags("get-user", "error", "false"), Value: 1},
+			u.ExpectedMetric{Name: "requests", Tags: endpointTags("get-user", "error", "true"), Value: 1},
+			u.ExpectedMetric{Name: "requests", Tags: endpointTags("get-user-override", "error", "false"), Value: 1},
+			u.ExpectedMetric{Name: "requests", Tags: endpointTags("get-user-client", "error", "false"), Value: 0},
+		)
+		// TODO something wrong with string generation, .P99 should not be appended to the tag
+		// as a result we cannot use u.AssertGaugeMetrics
+		_, g := testTracer.metrics.Snapshot()
+		assert.EqualValues(t, 51, g["request_latency|endpoint=get-user|error=false.P99"])
+		assert.EqualValues(t, 51, g["request_latency|endpoint=get-user|error=true.P99"])
+	})
+}
+
+func TestTags(t *testing.T) {
+	type tagTestCase struct {
+		key     string
+		value   interface{}
+		metrics []u.ExpectedMetric
+	}
+
+	testCases := []tagTestCase{
+		{key: "something", value: 42, metrics: []u.ExpectedMetric{
+			{Name: "requests", Value: 1, Tags: tags("error", "false")},
+		}},
+		{key: "error", value: true, metrics: []u.ExpectedMetric{
+			{Name: "requests", Value: 1, Tags: tags("error", "true")},
+		}},
+		{key: "error", value: "true", metrics: []u.ExpectedMetric{
+			{Name: "requests", Value: 1, Tags: tags("error", "true")},
+		}},
+	}
+
+	for i := 2; i <= 5; i++ {
+		values := []interface{}{
+			i * 100,
+			uint16(i * 100),
+			fmt.Sprintf("%d00", i),
+		}
+		for _, v := range values {
+			testCases = append(testCases, tagTestCase{
+				key: "http.status_code", value: v, metrics: []u.ExpectedMetric{
+					{Name: "http_requests", Value: 1, Tags: tags("status_code", fmt.Sprintf("%dxx", i))},
+				},
+			})
+		}
+	}
+
+	for _, tc := range testCases {
+		testCase := tc // capture loop var
+		for i := range testCase.metrics {
+			testCase.metrics[i].Tags["endpoint"] = "span"
+		}
+		t.Run(fmt.Sprintf("%s-%v", testCase.key, testCase.value), func(t *testing.T) {
+			withTestTracer(func(testTracer *testTracer) {
+				span := testTracer.tracer.StartSpan("span", ext.SpanKindRPCServer)
+				span.SetTag(testCase.key, testCase.value)
+				span.Finish()
+				u.AssertCounterMetrics(t, testTracer.metrics, testCase.metrics...)
+			})
+		})
+	}
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/sampler.go

@@ -0,0 +1,531 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package jaeger
+
+import (
+	"fmt"
+	"math"
+	"net/url"
+	"sync"
+	"time"
+
+	"github.com/uber/jaeger-client-go/log"
+	"github.com/uber/jaeger-client-go/thrift-gen/sampling"
+	"github.com/uber/jaeger-client-go/utils"
+)
+
+const (
+	defaultSamplingServerURL       = "http://localhost:5778/sampling"
+	defaultSamplingRefreshInterval = time.Minute
+	defaultMaxOperations           = 2000
+)
+
+// Sampler decides whether a new trace should be sampled or not.
+type Sampler interface {
+	// IsSampled decides whether a trace with given `id` and `operation`
+	// should be sampled. This function will also return the tags that
+	// can be used to identify the type of sampling that was applied to
+	// the root span. Most simple samplers would return two tags,
+	// sampler.type and sampler.param, similar to those used in the Configuration
+	IsSampled(id TraceID, operation string) (sampled bool, tags []Tag)
+
+	// Close does a clean shutdown of the sampler, stopping any background
+	// go-routines it may have started.
+	Close()
+
+	// Equal checks if the `other` sampler is functionally equivalent
+	// to this sampler.
+	// TODO remove this function. This function is used to determine if 2 samplers are equivalent
+	// which does not bode well with the adaptive sampler which has to create all the composite samplers
+	// for the comparison to occur. This is expensive to do if only one sampler has changed.
+	Equal(other Sampler) bool
+}
+
+// -----------------------
+
+// ConstSampler is a sampler that always makes the same decision.
+type ConstSampler struct {
+	Decision bool
+	tags     []Tag
+}
+
+// NewConstSampler creates a ConstSampler.
+func NewConstSampler(sample bool) Sampler {
+	tags := []Tag{
+		{key: SamplerTypeTagKey, value: SamplerTypeConst},
+		{key: SamplerParamTagKey, value: sample},
+	}
+	return &ConstSampler{Decision: sample, tags: tags}
+}
+
+// IsSampled implements IsSampled() of Sampler.
+func (s *ConstSampler) IsSampled(id TraceID, operation string) (bool, []Tag) {
+	return s.Decision, s.tags
+}
+
+// Close implements Close() of Sampler.
+func (s *ConstSampler) Close() {
+	// nothing to do
+}
+
+// Equal implements Equal() of Sampler.
+func (s *ConstSampler) Equal(other Sampler) bool {
+	if o, ok := other.(*ConstSampler); ok {
+		return s.Decision == o.Decision
+	}
+	return false
+}
+
+// -----------------------
+
+// ProbabilisticSampler is a sampler that randomly samples a certain percentage
+// of traces.
+type ProbabilisticSampler struct {
+	samplingRate     float64
+	samplingBoundary uint64
+	tags             []Tag
+}
+
+const maxRandomNumber = ^(uint64(1) << 63) // i.e. 0x7fffffffffffffff
+
+// NewProbabilisticSampler creates a sampler that randomly samples a certain percentage of traces specified by the
+// samplingRate, in the range between 0.0 and 1.0.
+//
+// It relies on the fact that new trace IDs are 63bit random numbers themselves, thus making the sampling decision
+// without generating a new random number, but simply calculating if traceID < (samplingRate * 2^63).
+// TODO remove the error from this function for next major release
+func NewProbabilisticSampler(samplingRate float64) (*ProbabilisticSampler, error) {
+	if samplingRate < 0.0 || samplingRate > 1.0 {
+		return nil, fmt.Errorf("Sampling Rate must be between 0.0 and 1.0, received %f", samplingRate)
+	}
+	return newProbabilisticSampler(samplingRate), nil
+}
+
+func newProbabilisticSampler(samplingRate float64) *ProbabilisticSampler {
+	samplingRate = math.Max(0.0, math.Min(samplingRate, 1.0))
+	tags := []Tag{
+		{key: SamplerTypeTagKey, value: SamplerTypeProbabilistic},
+		{key: SamplerParamTagKey, value: samplingRate},
+	}
+	return &ProbabilisticSampler{
+		samplingRate:     samplingRate,
+		samplingBoundary: uint64(float64(maxRandomNumber) * samplingRate),
+		tags:             tags,
+	}
+}
+
+// SamplingRate returns the sampling probability this sampled was constructed with.
+func (s *ProbabilisticSampler) SamplingRate() float64 {
+	return s.samplingRate
+}
+
+// IsSampled implements IsSampled() of Sampler.
+func (s *ProbabilisticSampler) IsSampled(id TraceID, operation string) (bool, []Tag) {
+	return s.samplingBoundary >= id.Low, s.tags
+}
+
+// Close implements Close() of Sampler.
+func (s *ProbabilisticSampler) Close() {
+	// nothing to do
+}
+
+// Equal implements Equal() of Sampler.
+func (s *ProbabilisticSampler) Equal(other Sampler) bool {
+	if o, ok := other.(*ProbabilisticSampler); ok {
+		return s.samplingBoundary == o.samplingBoundary
+	}
+	return false
+}
+
+// -----------------------
+
+type rateLimitingSampler struct {
+	maxTracesPerSecond float64
+	rateLimiter        utils.RateLimiter
+	tags               []Tag
+}
+
+// NewRateLimitingSampler creates a sampler that samples at most maxTracesPerSecond. The distribution of sampled
+// traces follows burstiness of the service, i.e. a service with uniformly distributed requests will have those
+// requests sampled uniformly as well, but if requests are bursty, especially sub-second, then a number of
+// sequential requests can be sampled each second.
+func NewRateLimitingSampler(maxTracesPerSecond float64) Sampler {
+	tags := []Tag{
+		{key: SamplerTypeTagKey, value: SamplerTypeRateLimiting},
+		{key: SamplerParamTagKey, value: maxTracesPerSecond},
+	}
+	return &rateLimitingSampler{
+		maxTracesPerSecond: maxTracesPerSecond,
+		rateLimiter:        utils.NewRateLimiter(maxTracesPerSecond, math.Max(maxTracesPerSecond, 1.0)),
+		tags:               tags,
+	}
+}
+
+// IsSampled implements IsSampled() of Sampler.
+func (s *rateLimitingSampler) IsSampled(id TraceID, operation string) (bool, []Tag) {
+	return s.rateLimiter.CheckCredit(1.0), s.tags
+}
+
+func (s *rateLimitingSampler) Close() {
+	// nothing to do
+}
+
+func (s *rateLimitingSampler) Equal(other Sampler) bool {
+	if o, ok := other.(*rateLimitingSampler); ok {
+		return s.maxTracesPerSecond == o.maxTracesPerSecond
+	}
+	return false
+}
+
+// -----------------------
+
+// GuaranteedThroughputProbabilisticSampler is a sampler that leverages both probabilisticSampler and
+// rateLimitingSampler. The rateLimitingSampler is used as a guaranteed lower bound sampler such that
+// every operation is sampled at least once in a time interval defined by the lowerBound. ie a lowerBound
+// of 1.0 / (60 * 10) will sample an operation at least once every 10 minutes.
+//
+// The probabilisticSampler is given higher priority when tags are emitted, ie. if IsSampled() for both
+// samplers return true, the tags for probabilisticSampler will be used.
+type GuaranteedThroughputProbabilisticSampler struct {
+	probabilisticSampler *ProbabilisticSampler
+	lowerBoundSampler    Sampler
+	tags                 []Tag
+	samplingRate         float64
+	lowerBound           float64
+}
+
+// NewGuaranteedThroughputProbabilisticSampler returns a delegating sampler that applies both
+// probabilisticSampler and rateLimitingSampler.
+func NewGuaranteedThroughputProbabilisticSampler(
+	lowerBound, samplingRate float64,
+) (*GuaranteedThroughputProbabilisticSampler, error) {
+	return newGuaranteedThroughputProbabilisticSampler(lowerBound, samplingRate), nil
+}
+
+func newGuaranteedThroughputProbabilisticSampler(lowerBound, samplingRate float64) *GuaranteedThroughputProbabilisticSampler {
+	s := &GuaranteedThroughputProbabilisticSampler{
+		lowerBoundSampler: NewRateLimitingSampler(lowerBound),
+		lowerBound:        lowerBound,
+	}
+	s.setProbabilisticSampler(samplingRate)
+	return s
+}
+
+func (s *GuaranteedThroughputProbabilisticSampler) setProbabilisticSampler(samplingRate float64) {
+	if s.probabilisticSampler == nil || s.samplingRate != samplingRate {
+		s.probabilisticSampler = newProbabilisticSampler(samplingRate)
+		s.samplingRate = s.probabilisticSampler.SamplingRate()
+		s.tags = []Tag{
+			{key: SamplerTypeTagKey, value: SamplerTypeLowerBound},
+			{key: SamplerParamTagKey, value: s.samplingRate},
+		}
+	}
+}
+
+// IsSampled implements IsSampled() of Sampler.
+func (s *GuaranteedThroughputProbabilisticSampler) IsSampled(id TraceID, operation string) (bool, []Tag) {
+	if sampled, tags := s.probabilisticSampler.IsSampled(id, operation); sampled {
+		s.lowerBoundSampler.IsSampled(id, operation)
+		return true, tags
+	}
+	sampled, _ := s.lowerBoundSampler.IsSampled(id, operation)
+	return sampled, s.tags
+}
+
+// Close implements Close() of Sampler.
+func (s *GuaranteedThroughputProbabilisticSampler) Close() {
+	s.probabilisticSampler.Close()
+	s.lowerBoundSampler.Close()
+}
+
+// Equal implements Equal() of Sampler.
+func (s *GuaranteedThroughputProbabilisticSampler) Equal(other Sampler) bool {
+	// NB The Equal() function is expensive and will be removed. See adaptiveSampler.Equal() for
+	// more information.
+	return false
+}
+
+// this function should only be called while holding a Write lock
+func (s *GuaranteedThroughputProbabilisticSampler) update(lowerBound, samplingRate float64) {
+	s.setProbabilisticSampler(samplingRate)
+	if s.lowerBound != lowerBound {
+		s.lowerBoundSampler = NewRateLimitingSampler(lowerBound)
+		s.lowerBound = lowerBound
+	}
+}
+
+// -----------------------
+
+type adaptiveSampler struct {
+	sync.RWMutex
+
+	samplers       map[string]*GuaranteedThroughputProbabilisticSampler
+	defaultSampler *ProbabilisticSampler
+	lowerBound     float64
+	maxOperations  int
+}
+
+// NewAdaptiveSampler returns a delegating sampler that applies both probabilisticSampler and
+// rateLimitingSampler via the guaranteedThroughputProbabilisticSampler. This sampler keeps track of all
+// operations and delegates calls to the respective guaranteedThroughputProbabilisticSampler.
+func NewAdaptiveSampler(strategies *sampling.PerOperationSamplingStrategies, maxOperations int) (Sampler, error) {
+	return newAdaptiveSampler(strategies, maxOperations), nil
+}
+
+func newAdaptiveSampler(strategies *sampling.PerOperationSamplingStrategies, maxOperations int) Sampler {
+	samplers := make(map[string]*GuaranteedThroughputProbabilisticSampler)
+	for _, strategy := range strategies.PerOperationStrategies {
+		sampler := newGuaranteedThroughputProbabilisticSampler(
+			strategies.DefaultLowerBoundTracesPerSecond,
+			strategy.ProbabilisticSampling.SamplingRate,
+		)
+		samplers[strategy.Operation] = sampler
+	}
+	return &adaptiveSampler{
+		samplers:       samplers,
+		defaultSampler: newProbabilisticSampler(strategies.DefaultSamplingProbability),
+		lowerBound:     strategies.DefaultLowerBoundTracesPerSecond,
+		maxOperations:  maxOperations,
+	}
+}
+
+func (s *adaptiveSampler) IsSampled(id TraceID, operation string) (bool, []Tag) {
+	s.RLock()
+	sampler, ok := s.samplers[operation]
+	if ok {
+		defer s.RUnlock()
+		return sampler.IsSampled(id, operation)
+	}
+	s.RUnlock()
+	s.Lock()
+	defer s.Unlock()
+
+	// Check if sampler has already been created
+	sampler, ok = s.samplers[operation]
+	if ok {
+		return sampler.IsSampled(id, operation)
+	}
+	// Store only up to maxOperations of unique ops.
+	if len(s.samplers) >= s.maxOperations {
+		return s.defaultSampler.IsSampled(id, operation)
+	}
+	newSampler := newGuaranteedThroughputProbabilisticSampler(s.lowerBound, s.defaultSampler.SamplingRate())
+	s.samplers[operation] = newSampler
+	return newSampler.IsSampled(id, operation)
+}
+
+func (s *adaptiveSampler) Close() {
+	s.Lock()
+	defer s.Unlock()
+	for _, sampler := range s.samplers {
+		sampler.Close()
+	}
+	s.defaultSampler.Close()
+}
+
+func (s *adaptiveSampler) Equal(other Sampler) bool {
+	// NB The Equal() function is overly expensive for adaptiveSampler since it's composed of multiple
+	// samplers which all need to be initialized before this function can be called for a comparison.
+	// Therefore, adaptiveSampler uses the update() function to only alter the samplers that need
+	// changing. Hence this function always returns false so that the update function can be called.
+	// Once the Equal() function is removed from the Sampler API, this will no longer be needed.
+	return false
+}
+
+func (s *adaptiveSampler) update(strategies *sampling.PerOperationSamplingStrategies) {
+	s.Lock()
+	defer s.Unlock()
+	for _, strategy := range strategies.PerOperationStrategies {
+		operation := strategy.Operation
+		samplingRate := strategy.ProbabilisticSampling.SamplingRate
+		lowerBound := strategies.DefaultLowerBoundTracesPerSecond
+		if sampler, ok := s.samplers[operation]; ok {
+			sampler.update(lowerBound, samplingRate)
+		} else {
+			sampler := newGuaranteedThroughputProbabilisticSampler(
+				lowerBound,
+				samplingRate,
+			)
+			s.samplers[operation] = sampler
+		}
+	}
+	s.lowerBound = strategies.DefaultLowerBoundTracesPerSecond
+	if s.defaultSampler.SamplingRate() != strategies.DefaultSamplingProbability {
+		s.defaultSampler = newProbabilisticSampler(strategies.DefaultSamplingProbability)
+	}
+}
+
+// -----------------------
+
+// RemotelyControlledSampler is a delegating sampler that polls a remote server
+// for the appropriate sampling strategy, constructs a corresponding sampler and
+// delegates to it for sampling decisions.
+type RemotelyControlledSampler struct {
+	sync.RWMutex
+	samplerOptions
+
+	serviceName string
+	timer       *time.Ticker
+	manager     sampling.SamplingManager
+	pollStopped sync.WaitGroup
+}
+
+type httpSamplingManager struct {
+	serverURL string
+}
+
+func (s *httpSamplingManager) GetSamplingStrategy(serviceName string) (*sampling.SamplingStrategyResponse, error) {
+	var out sampling.SamplingStrategyResponse
+	v := url.Values{}
+	v.Set("service", serviceName)
+	if err := utils.GetJSON(s.serverURL+"?"+v.Encode(), &out); err != nil {
+		return nil, err
+	}
+	return &out, nil
+}
+
+// NewRemotelyControlledSampler creates a sampler that periodically pulls
+// the sampling strategy from an HTTP sampling server (e.g. jaeger-agent).
+func NewRemotelyControlledSampler(
+	serviceName string,
+	opts ...SamplerOption,
+) *RemotelyControlledSampler {
+	options := applySamplerOptions(opts...)
+	sampler := &RemotelyControlledSampler{
+		samplerOptions: options,
+		serviceName:    serviceName,
+		timer:          time.NewTicker(options.samplingRefreshInterval),
+		manager:        &httpSamplingManager{serverURL: options.samplingServerURL},
+	}
+
+	go sampler.pollController()
+	return sampler
+}
+
+func applySamplerOptions(opts ...SamplerOption) samplerOptions {
+	options := samplerOptions{}
+	for _, option := range opts {
+		option(&options)
+	}
+	if options.sampler == nil {
+		options.sampler = newProbabilisticSampler(0.001)
+	}
+	if options.logger == nil {
+		options.logger = log.NullLogger
+	}
+	if options.maxOperations <= 0 {
+		options.maxOperations = defaultMaxOperations
+	}
+	if options.samplingServerURL == "" {
+		options.samplingServerURL = defaultSamplingServerURL
+	}
+	if options.metrics == nil {
+		options.metrics = NewNullMetrics()
+	}
+	if options.samplingRefreshInterval <= 0 {
+		options.samplingRefreshInterval = defaultSamplingRefreshInterval
+	}
+	return options
+}
+
+// IsSampled implements IsSampled() of Sampler.
+func (s *RemotelyControlledSampler) IsSampled(id TraceID, operation string) (bool, []Tag) {
+	s.RLock()
+	defer s.RUnlock()
+	return s.sampler.IsSampled(id, operation)
+}
+
+// Close implements Close() of Sampler.
+func (s *RemotelyControlledSampler) Close() {
+	s.RLock()
+	s.timer.Stop()
+	s.RUnlock()
+
+	s.pollStopped.Wait()
+}
+
+// Equal implements Equal() of Sampler.
+func (s *RemotelyControlledSampler) Equal(other Sampler) bool {
+	// NB The Equal() function is expensive and will be removed. See adaptiveSampler.Equal() for
+	// more information.
+	if o, ok := other.(*RemotelyControlledSampler); ok {
+		s.RLock()
+		o.RLock()
+		defer s.RUnlock()
+		defer o.RUnlock()
+		return s.sampler.Equal(o.sampler)
+	}
+	return false
+}
+
+func (s *RemotelyControlledSampler) pollController() {
+	// in unit tests we re-assign the timer Ticker, so need to lock to avoid data races
+	s.Lock()
+	timer := s.timer
+	s.Unlock()
+
+	for range timer.C {
+		s.updateSampler()
+	}
+	s.pollStopped.Add(1)
+}
+
+func (s *RemotelyControlledSampler) updateSampler() {
+	res, err := s.manager.GetSamplingStrategy(s.serviceName)
+	if err != nil {
+		s.metrics.SamplerQueryFailure.Inc(1)
+		return
+	}
+	s.Lock()
+	defer s.Unlock()
+
+	s.metrics.SamplerRetrieved.Inc(1)
+	if strategies := res.GetOperationSampling(); strategies != nil {
+		s.updateAdaptiveSampler(strategies)
+	} else {
+		err = s.updateRateLimitingOrProbabilisticSampler(res)
+	}
+	if err != nil {
+		s.metrics.SamplerUpdateFailure.Inc(1)
+		s.logger.Infof("Unable to handle sampling strategy response %+v. Got error: %v", res, err)
+		return
+	}
+	s.metrics.SamplerUpdated.Inc(1)
+}
+
+// NB: this function should only be called while holding a Write lock
+func (s *RemotelyControlledSampler) updateAdaptiveSampler(strategies *sampling.PerOperationSamplingStrategies) {
+	if adaptiveSampler, ok := s.sampler.(*adaptiveSampler); ok {
+		adaptiveSampler.update(strategies)
+	} else {
+		s.sampler = newAdaptiveSampler(strategies, s.maxOperations)
+	}
+}
+
+// NB: this function should only be called while holding a Write lock
+func (s *RemotelyControlledSampler) updateRateLimitingOrProbabilisticSampler(res *sampling.SamplingStrategyResponse) error {
+	var newSampler Sampler
+	if probabilistic := res.GetProbabilisticSampling(); probabilistic != nil {
+		newSampler = newProbabilisticSampler(probabilistic.SamplingRate)
+	} else if rateLimiting := res.GetRateLimitingSampling(); rateLimiting != nil {
+		newSampler = NewRateLimitingSampler(float64(rateLimiting.MaxTracesPerSecond))
+	} else {
+		return fmt.Errorf("Unsupported sampling strategy type %v", res.GetStrategyType())
+	}
+	if !s.sampler.Equal(newSampler) {
+		s.sampler = newSampler
+	}
+	return nil
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/sampler_options.go

@@ -0,0 +1,81 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package jaeger
+
+import (
+	"time"
+)
+
+// SamplerOption is a function that sets some option on the sampler
+type SamplerOption func(options *samplerOptions)
+
+// SamplerOptions is a factory for all available SamplerOption's
+var SamplerOptions samplerOptions
+
+type samplerOptions struct {
+	metrics                 *Metrics
+	maxOperations           int
+	sampler                 Sampler
+	logger                  Logger
+	samplingServerURL       string
+	samplingRefreshInterval time.Duration
+}
+
+// Metrics creates a SamplerOption that initializes Metrics on the sampler,
+// which is used to emit statistics.
+func (samplerOptions) Metrics(m *Metrics) SamplerOption {
+	return func(o *samplerOptions) {
+		o.metrics = m
+	}
+}
+
+// MaxOperations creates a SamplerOption that sets the maximum number of
+// operations the sampler will keep track of.
+func (samplerOptions) MaxOperations(maxOperations int) SamplerOption {
+	return func(o *samplerOptions) {
+		o.maxOperations = maxOperations
+	}
+}
+
+// InitialSampler creates a SamplerOption that sets the initial sampler
+// to use before a remote sampler is created and used.
+func (samplerOptions) InitialSampler(sampler Sampler) SamplerOption {
+	return func(o *samplerOptions) {
+		o.sampler = sampler
+	}
+}
+
+// Logger creates a SamplerOption that sets the logger used by the sampler.
+func (samplerOptions) Logger(logger Logger) SamplerOption {
+	return func(o *samplerOptions) {
+		o.logger = logger
+	}
+}
+
+// SamplingServerURL creates a SamplerOption that sets the sampling server url
+// of the local agent that contains the sampling strategies.
+func (samplerOptions) SamplingServerURL(samplingServerURL string) SamplerOption {
+	return func(o *samplerOptions) {
+		o.samplingServerURL = samplingServerURL
+	}
+}
+
+// SamplingRefreshInterval creates a SamplerOption that sets how often the
+// sampler will poll local agent for the appropriate sampling strategy.
+func (samplerOptions) SamplingRefreshInterval(samplingRefreshInterval time.Duration) SamplerOption {
+	return func(o *samplerOptions) {
+		o.samplingRefreshInterval = samplingRefreshInterval
+	}
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/sampler_test.go

@@ -0,0 +1,703 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package jaeger
+
+import (
+	"errors"
+	"fmt"
+	"runtime"
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"github.com/uber/jaeger-lib/metrics"
+	mTestutils "github.com/uber/jaeger-lib/metrics/testutils"
+
+	"github.com/uber/jaeger-client-go/log"
+	"github.com/uber/jaeger-client-go/testutils"
+	"github.com/uber/jaeger-client-go/thrift-gen/sampling"
+	"github.com/uber/jaeger-client-go/utils"
+)
+
+const (
+	testOperationName          = "op"
+	testFirstTimeOperationName = "firstTimeOp"
+
+	testDefaultSamplingProbability = 0.5
+	testMaxID                      = uint64(1) << 62
+	testDefaultMaxOperations       = 10
+)
+
+var (
+	testProbabilisticExpectedTags = []Tag{
+		{"sampler.type", "probabilistic"},
+		{"sampler.param", 0.5},
+	}
+	testLowerBoundExpectedTags = []Tag{
+		{"sampler.type", "lowerbound"},
+		{"sampler.param", 0.5},
+	}
+)
+
+func TestSamplerTags(t *testing.T) {
+	prob, err := NewProbabilisticSampler(0.1)
+	require.NoError(t, err)
+	rate := NewRateLimitingSampler(0.1)
+	remote := &RemotelyControlledSampler{}
+	remote.sampler = NewConstSampler(true)
+	tests := []struct {
+		sampler  Sampler
+		typeTag  string
+		paramTag interface{}
+	}{
+		{NewConstSampler(true), "const", true},
+		{NewConstSampler(false), "const", false},
+		{prob, "probabilistic", 0.1},
+		{rate, "ratelimiting", 0.1},
+		{remote, "const", true},
+	}
+	for _, test := range tests {
+		_, tags := test.sampler.IsSampled(TraceID{}, testOperationName)
+		count := 0
+		for _, tag := range tags {
+			if tag.key == SamplerTypeTagKey {
+				assert.Equal(t, test.typeTag, tag.value)
+				count++
+			}
+			if tag.key == SamplerParamTagKey {
+				assert.Equal(t, test.paramTag, tag.value)
+				count++
+			}
+		}
+		assert.Equal(t, 2, count)
+	}
+}
+
+func TestApplySamplerOptions(t *testing.T) {
+	options := applySamplerOptions()
+	sampler, ok := options.sampler.(*ProbabilisticSampler)
+	assert.True(t, ok)
+	assert.Equal(t, 0.001, sampler.samplingRate)
+
+	assert.NotNil(t, options.logger)
+	assert.NotZero(t, options.maxOperations)
+	assert.NotEmpty(t, options.samplingServerURL)
+	assert.NotNil(t, options.metrics)
+	assert.NotZero(t, options.samplingRefreshInterval)
+}
+
+func TestProbabilisticSamplerErrors(t *testing.T) {
+	_, err := NewProbabilisticSampler(-0.1)
+	assert.Error(t, err)
+	_, err = NewProbabilisticSampler(1.1)
+	assert.Error(t, err)
+}
+
+func TestProbabilisticSampler(t *testing.T) {
+	sampler, _ := NewProbabilisticSampler(0.5)
+	sampled, tags := sampler.IsSampled(TraceID{Low: testMaxID + 10}, testOperationName)
+	assert.False(t, sampled)
+	assert.Equal(t, testProbabilisticExpectedTags, tags)
+	sampled, tags = sampler.IsSampled(TraceID{Low: testMaxID - 20}, testOperationName)
+	assert.True(t, sampled)
+	assert.Equal(t, testProbabilisticExpectedTags, tags)
+	sampler2, _ := NewProbabilisticSampler(0.5)
+	assert.True(t, sampler.Equal(sampler2))
+	assert.False(t, sampler.Equal(NewConstSampler(true)))
+}
+
+func TestProbabilisticSamplerPerformance(t *testing.T) {
+	t.Skip("Skipped performance test")
+	sampler, _ := NewProbabilisticSampler(0.01)
+	rand := utils.NewRand(8736823764)
+	var count uint64
+	for i := 0; i < 100000000; i++ {
+		id := TraceID{Low: uint64(rand.Int63())}
+		if sampled, _ := sampler.IsSampled(id, testOperationName); sampled {
+			count++
+		}
+	}
+	println("Sampled:", count, "rate=", float64(count)/float64(100000000))
+	// Sampled: 999829 rate= 0.009998290
+}
+
+func TestRateLimitingSampler(t *testing.T) {
+	sampler := NewRateLimitingSampler(2)
+	sampler2 := NewRateLimitingSampler(2)
+	sampler3 := NewRateLimitingSampler(3)
+	assert.True(t, sampler.Equal(sampler2))
+	assert.False(t, sampler.Equal(sampler3))
+	assert.False(t, sampler.Equal(NewConstSampler(false)))
+
+	sampler = NewRateLimitingSampler(2)
+	sampled, _ := sampler.IsSampled(TraceID{}, testOperationName)
+	assert.True(t, sampled)
+	sampled, _ = sampler.IsSampled(TraceID{}, testOperationName)
+	assert.True(t, sampled)
+	sampled, _ = sampler.IsSampled(TraceID{}, testOperationName)
+	assert.False(t, sampled)
+
+	sampler = NewRateLimitingSampler(0.1)
+	sampled, _ = sampler.IsSampled(TraceID{}, testOperationName)
+	assert.True(t, sampled)
+	sampled, _ = sampler.IsSampled(TraceID{}, testOperationName)
+	assert.False(t, sampled)
+}
+
+func TestGuaranteedThroughputProbabilisticSamplerUpdate(t *testing.T) {
+	samplingRate := 0.5
+	lowerBound := 2.0
+	sampler, err := NewGuaranteedThroughputProbabilisticSampler(lowerBound, samplingRate)
+	assert.NoError(t, err)
+
+	assert.Equal(t, lowerBound, sampler.lowerBound)
+	assert.Equal(t, samplingRate, sampler.samplingRate)
+
+	newSamplingRate := 0.6
+	newLowerBound := 1.0
+	sampler.update(newLowerBound, newSamplingRate)
+	assert.Equal(t, newLowerBound, sampler.lowerBound)
+	assert.Equal(t, newSamplingRate, sampler.samplingRate)
+
+	newSamplingRate = 1.1
+	sampler.update(newLowerBound, newSamplingRate)
+	assert.Equal(t, 1.0, sampler.samplingRate)
+}
+
+func TestAdaptiveSampler(t *testing.T) {
+	samplingRates := []*sampling.OperationSamplingStrategy{
+		{
+			Operation:             testOperationName,
+			ProbabilisticSampling: &sampling.ProbabilisticSamplingStrategy{SamplingRate: testDefaultSamplingProbability},
+		},
+	}
+	strategies := &sampling.PerOperationSamplingStrategies{
+		DefaultSamplingProbability:       testDefaultSamplingProbability,
+		DefaultLowerBoundTracesPerSecond: 1.0,
+		PerOperationStrategies:           samplingRates,
+	}
+
+	sampler, err := NewAdaptiveSampler(strategies, testDefaultMaxOperations)
+	require.NoError(t, err)
+	defer sampler.Close()
+
+	sampled, tags := sampler.IsSampled(TraceID{Low: testMaxID + 10}, testOperationName)
+	assert.True(t, sampled)
+	assert.Equal(t, testLowerBoundExpectedTags, tags)
+
+	sampled, tags = sampler.IsSampled(TraceID{Low: testMaxID - 20}, testOperationName)
+	assert.True(t, sampled)
+	assert.Equal(t, testProbabilisticExpectedTags, tags)
+
+	sampled, tags = sampler.IsSampled(TraceID{Low: testMaxID + 10}, testOperationName)
+	assert.False(t, sampled)
+
+	// This operation is seen for the first time by the sampler
+	sampled, tags = sampler.IsSampled(TraceID{Low: testMaxID}, testFirstTimeOperationName)
+	assert.True(t, sampled)
+	assert.Equal(t, testProbabilisticExpectedTags, tags)
+}
+
+func TestAdaptiveSamplerErrors(t *testing.T) {
+	strategies := &sampling.PerOperationSamplingStrategies{
+		DefaultSamplingProbability:       testDefaultSamplingProbability,
+		DefaultLowerBoundTracesPerSecond: 2.0,
+		PerOperationStrategies: []*sampling.OperationSamplingStrategy{
+			{
+				Operation:             testOperationName,
+				ProbabilisticSampling: &sampling.ProbabilisticSamplingStrategy{SamplingRate: -0.1},
+			},
+		},
+	}
+
+	sampler, err := NewAdaptiveSampler(strategies, testDefaultMaxOperations)
+	assert.NoError(t, err)
+	assert.Equal(t, 0.0, sampler.(*adaptiveSampler).samplers[testOperationName].samplingRate)
+
+	strategies.PerOperationStrategies[0].ProbabilisticSampling.SamplingRate = 1.1
+	sampler, err = NewAdaptiveSampler(strategies, testDefaultMaxOperations)
+	assert.NoError(t, err)
+	assert.Equal(t, 1.0, sampler.(*adaptiveSampler).samplers[testOperationName].samplingRate)
+}
+
+func TestAdaptiveSamplerUpdate(t *testing.T) {
+	samplingRate := 0.1
+	lowerBound := 2.0
+	samplingRates := []*sampling.OperationSamplingStrategy{
+		{
+			Operation:             testOperationName,
+			ProbabilisticSampling: &sampling.ProbabilisticSamplingStrategy{SamplingRate: samplingRate},
+		},
+	}
+	strategies := &sampling.PerOperationSamplingStrategies{
+		DefaultSamplingProbability:       testDefaultSamplingProbability,
+		DefaultLowerBoundTracesPerSecond: lowerBound,
+		PerOperationStrategies:           samplingRates,
+	}
+
+	s, err := NewAdaptiveSampler(strategies, testDefaultMaxOperations)
+	assert.NoError(t, err)
+
+	sampler, ok := s.(*adaptiveSampler)
+	assert.True(t, ok)
+	assert.Equal(t, lowerBound, sampler.lowerBound)
+	assert.Equal(t, testDefaultSamplingProbability, sampler.defaultSampler.SamplingRate())
+	assert.Len(t, sampler.samplers, 1)
+
+	// Update the sampler with new sampling rates
+	newSamplingRate := 0.2
+	newLowerBound := 3.0
+	newDefaultSamplingProbability := 0.1
+	newSamplingRates := []*sampling.OperationSamplingStrategy{
+		{
+			Operation:             testOperationName,
+			ProbabilisticSampling: &sampling.ProbabilisticSamplingStrategy{SamplingRate: newSamplingRate},
+		},
+		{
+			Operation:             testFirstTimeOperationName,
+			ProbabilisticSampling: &sampling.ProbabilisticSamplingStrategy{SamplingRate: newSamplingRate},
+		},
+	}
+	strategies = &sampling.PerOperationSamplingStrategies{
+		DefaultSamplingProbability:       newDefaultSamplingProbability,
+		DefaultLowerBoundTracesPerSecond: newLowerBound,
+		PerOperationStrategies:           newSamplingRates,
+	}
+
+	sampler.update(strategies)
+	assert.Equal(t, newLowerBound, sampler.lowerBound)
+	assert.Equal(t, newDefaultSamplingProbability, sampler.defaultSampler.SamplingRate())
+	assert.Len(t, sampler.samplers, 2)
+}
+
+func initAgent(t *testing.T) (*testutils.MockAgent, *RemotelyControlledSampler, *metrics.LocalFactory) {
+	agent, err := testutils.StartMockAgent()
+	require.NoError(t, err)
+
+	metricsFactory := metrics.NewLocalFactory(0)
+	metrics := NewMetrics(metricsFactory, nil)
+
+	initialSampler, _ := NewProbabilisticSampler(0.001)
+	sampler := NewRemotelyControlledSampler(
+		"client app",
+		SamplerOptions.Metrics(metrics),
+		SamplerOptions.SamplingServerURL("http://"+agent.SamplingServerAddr()),
+		SamplerOptions.MaxOperations(testDefaultMaxOperations),
+		SamplerOptions.InitialSampler(initialSampler),
+		SamplerOptions.Logger(log.NullLogger),
+		SamplerOptions.SamplingRefreshInterval(time.Minute),
+	)
+	sampler.Close() // stop timer-based updates, we want to call them manually
+
+	return agent, sampler, metricsFactory
+}
+
+func TestRemotelyControlledSampler(t *testing.T) {
+	agent, remoteSampler, metricsFactory := initAgent(t)
+	defer agent.Close()
+
+	initSampler, ok := remoteSampler.sampler.(*ProbabilisticSampler)
+	assert.True(t, ok)
+
+	agent.AddSamplingStrategy("client app",
+		getSamplingStrategyResponse(sampling.SamplingStrategyType_PROBABILISTIC, testDefaultSamplingProbability))
+	remoteSampler.updateSampler()
+	mTestutils.AssertCounterMetrics(t, metricsFactory, []mTestutils.ExpectedMetric{
+		{Name: "jaeger.sampler", Tags: map[string]string{"state": "retrieved"}, Value: 1},
+		{Name: "jaeger.sampler", Tags: map[string]string{"state": "updated"}, Value: 1},
+	}...)
+	_, ok = remoteSampler.sampler.(*ProbabilisticSampler)
+	assert.True(t, ok)
+	assert.NotEqual(t, initSampler, remoteSampler.sampler, "Sampler should have been updated")
+
+	sampled, tags := remoteSampler.IsSampled(TraceID{Low: testMaxID + 10}, testOperationName)
+	assert.False(t, sampled)
+	assert.Equal(t, testProbabilisticExpectedTags, tags)
+	sampled, tags = remoteSampler.IsSampled(TraceID{Low: testMaxID - 10}, testOperationName)
+	assert.True(t, sampled)
+	assert.Equal(t, testProbabilisticExpectedTags, tags)
+
+	remoteSampler.sampler = initSampler
+	c := make(chan time.Time)
+	remoteSampler.Lock()
+	remoteSampler.timer = &time.Ticker{C: c}
+	remoteSampler.Unlock()
+	go remoteSampler.pollController()
+
+	c <- time.Now() // force update based on timer
+	time.Sleep(10 * time.Millisecond)
+	remoteSampler.Close()
+
+	_, ok = remoteSampler.sampler.(*ProbabilisticSampler)
+	assert.True(t, ok)
+	assert.NotEqual(t, initSampler, remoteSampler.sampler, "Sampler should have been updated from timer")
+
+	assert.True(t, remoteSampler.Equal(remoteSampler))
+}
+
+func generateTags(key string, value float64) []Tag {
+	return []Tag{
+		{"sampler.type", key},
+		{"sampler.param", value},
+	}
+}
+
+func TestRemotelyControlledSampler_updateSampler(t *testing.T) {
+	tests := []struct {
+		probabilities              map[string]float64
+		defaultProbability         float64
+		expectedDefaultProbability float64
+		expectedTags               []Tag
+	}{
+		{
+			probabilities:              map[string]float64{testOperationName: 1.1},
+			defaultProbability:         testDefaultSamplingProbability,
+			expectedDefaultProbability: testDefaultSamplingProbability,
+			expectedTags:               generateTags("probabilistic", 1.0),
+		},
+		{
+			probabilities:              map[string]float64{testOperationName: testDefaultSamplingProbability},
+			defaultProbability:         testDefaultSamplingProbability,
+			expectedDefaultProbability: testDefaultSamplingProbability,
+			expectedTags:               testProbabilisticExpectedTags,
+		},
+		{
+			probabilities: map[string]float64{
+				testOperationName:          testDefaultSamplingProbability,
+				testFirstTimeOperationName: testDefaultSamplingProbability,
+			},
+			defaultProbability:         testDefaultSamplingProbability,
+			expectedDefaultProbability: testDefaultSamplingProbability,
+			expectedTags:               testProbabilisticExpectedTags,
+		},
+		{
+			probabilities:              map[string]float64{"new op": 1.1},
+			defaultProbability:         testDefaultSamplingProbability,
+			expectedDefaultProbability: testDefaultSamplingProbability,
+			expectedTags:               testProbabilisticExpectedTags,
+		},
+		{
+			probabilities:              map[string]float64{"new op": 1.1},
+			defaultProbability:         1.1,
+			expectedDefaultProbability: 1.0,
+			expectedTags:               generateTags("probabilistic", 1.0),
+		},
+	}
+
+	for i, test := range tests {
+		t.Run(fmt.Sprintf("test_%d", i), func(t *testing.T) {
+			agent, sampler, metricsFactory := initAgent(t)
+			defer agent.Close()
+
+			initSampler, ok := sampler.sampler.(*ProbabilisticSampler)
+			assert.True(t, ok)
+
+			res := &sampling.SamplingStrategyResponse{
+				StrategyType: sampling.SamplingStrategyType_PROBABILISTIC,
+				OperationSampling: &sampling.PerOperationSamplingStrategies{
+					DefaultSamplingProbability:       test.defaultProbability,
+					DefaultLowerBoundTracesPerSecond: 0.001,
+				},
+			}
+			for opName, prob := range test.probabilities {
+				res.OperationSampling.PerOperationStrategies = append(res.OperationSampling.PerOperationStrategies,
+					&sampling.OperationSamplingStrategy{
+						Operation: opName,
+						ProbabilisticSampling: &sampling.ProbabilisticSamplingStrategy{
+							SamplingRate: prob,
+						},
+					},
+				)
+			}
+
+			agent.AddSamplingStrategy("client app", res)
+			sampler.updateSampler()
+
+			mTestutils.AssertCounterMetrics(t, metricsFactory,
+				mTestutils.ExpectedMetric{
+					Name: "jaeger.sampler" + "|state=updated", Value: 1,
+				},
+			)
+
+			s, ok := sampler.sampler.(*adaptiveSampler)
+			assert.True(t, ok)
+			assert.NotEqual(t, initSampler, sampler.sampler, "Sampler should have been updated")
+			assert.Equal(t, test.expectedDefaultProbability, s.defaultSampler.SamplingRate())
+
+			// First call is always sampled
+			sampled, tags := sampler.IsSampled(TraceID{Low: testMaxID + 10}, testOperationName)
+			assert.True(t, sampled)
+
+			sampled, tags = sampler.IsSampled(TraceID{Low: testMaxID - 10}, testOperationName)
+			assert.True(t, sampled)
+			assert.Equal(t, test.expectedTags, tags)
+		})
+	}
+}
+
+func TestMaxOperations(t *testing.T) {
+	samplingRates := []*sampling.OperationSamplingStrategy{
+		{
+			Operation:             testOperationName,
+			ProbabilisticSampling: &sampling.ProbabilisticSamplingStrategy{SamplingRate: 0.1},
+		},
+	}
+	strategies := &sampling.PerOperationSamplingStrategies{
+		DefaultSamplingProbability:       testDefaultSamplingProbability,
+		DefaultLowerBoundTracesPerSecond: 2.0,
+		PerOperationStrategies:           samplingRates,
+	}
+
+	sampler, err := NewAdaptiveSampler(strategies, 1)
+	assert.NoError(t, err)
+
+	sampled, tags := sampler.IsSampled(TraceID{Low: testMaxID - 10}, testFirstTimeOperationName)
+	assert.True(t, sampled)
+	assert.Equal(t, testProbabilisticExpectedTags, tags)
+}
+
+func TestSamplerQueryError(t *testing.T) {
+	agent, sampler, metricsFactory := initAgent(t)
+	defer agent.Close()
+
+	// override the actual handler
+	sampler.manager = &fakeSamplingManager{}
+
+	initSampler, ok := sampler.sampler.(*ProbabilisticSampler)
+	assert.True(t, ok)
+
+	sampler.Close() // stop timer-based updates, we want to call them manually
+
+	sampler.updateSampler()
+	assert.Equal(t, initSampler, sampler.sampler, "Sampler should not have been updated due to query error")
+
+	mTestutils.AssertCounterMetrics(t, metricsFactory,
+		mTestutils.ExpectedMetric{
+			Name:  "jaeger.sampler",
+			Tags:  map[string]string{"phase": "query", "state": "failure"},
+			Value: 1,
+		},
+	)
+}
+
+type fakeSamplingManager struct{}
+
+func (c *fakeSamplingManager) GetSamplingStrategy(serviceName string) (*sampling.SamplingStrategyResponse, error) {
+	return nil, errors.New("query error")
+}
+
+func TestRemotelyControlledSampler_updateSamplerFromAdaptiveSampler(t *testing.T) {
+	agent, remoteSampler, metricsFactory := initAgent(t)
+	defer agent.Close()
+	remoteSampler.Close() // stop timer-based updates, we want to call them manually
+
+	strategies := &sampling.PerOperationSamplingStrategies{
+		DefaultSamplingProbability:       testDefaultSamplingProbability,
+		DefaultLowerBoundTracesPerSecond: 1.0,
+	}
+
+	adaptiveSampler, err := NewAdaptiveSampler(strategies, testDefaultMaxOperations)
+	require.NoError(t, err)
+
+	// Overwrite the sampler with an adaptive sampler
+	remoteSampler.sampler = adaptiveSampler
+
+	agent.AddSamplingStrategy("client app",
+		getSamplingStrategyResponse(sampling.SamplingStrategyType_PROBABILISTIC, 0.5))
+	remoteSampler.updateSampler()
+
+	// Sampler should have been updated to probabilistic
+	_, ok := remoteSampler.sampler.(*ProbabilisticSampler)
+	require.True(t, ok)
+
+	// Overwrite the sampler with an adaptive sampler
+	remoteSampler.sampler = adaptiveSampler
+
+	agent.AddSamplingStrategy("client app",
+		getSamplingStrategyResponse(sampling.SamplingStrategyType_RATE_LIMITING, 1))
+	remoteSampler.updateSampler()
+
+	// Sampler should have been updated to ratelimiting
+	_, ok = remoteSampler.sampler.(*rateLimitingSampler)
+	require.True(t, ok)
+
+	// Overwrite the sampler with an adaptive sampler
+	remoteSampler.sampler = adaptiveSampler
+
+	// Update existing adaptive sampler
+	agent.AddSamplingStrategy("client app", &sampling.SamplingStrategyResponse{OperationSampling: strategies})
+	remoteSampler.updateSampler()
+
+	mTestutils.AssertCounterMetrics(t, metricsFactory,
+		mTestutils.ExpectedMetric{
+			Name:  "jaeger.sampler",
+			Tags:  map[string]string{"state": "retrieved"},
+			Value: 3,
+		},
+		mTestutils.ExpectedMetric{
+			Name:  "jaeger.sampler",
+			Tags:  map[string]string{"state": "updated"},
+			Value: 3,
+		},
+	)
+}
+
+func TestRemotelyControlledSampler_updateRateLimitingOrProbabilisticSampler(t *testing.T) {
+	probabilisticSampler, err := NewProbabilisticSampler(0.002)
+	require.NoError(t, err)
+	otherProbabilisticSampler, err := NewProbabilisticSampler(0.003)
+	require.NoError(t, err)
+	maxProbabilisticSampler, err := NewProbabilisticSampler(1.0)
+	require.NoError(t, err)
+
+	rateLimitingSampler := NewRateLimitingSampler(2)
+	otherRateLimitingSampler := NewRateLimitingSampler(3)
+
+	testCases := []struct {
+		res                  *sampling.SamplingStrategyResponse
+		initSampler          Sampler
+		expectedSampler      Sampler
+		shouldErr            bool
+		referenceEquivalence bool
+		caption              string
+	}{
+		{
+			res:                  getSamplingStrategyResponse(sampling.SamplingStrategyType_PROBABILISTIC, 1.5),
+			initSampler:          probabilisticSampler,
+			expectedSampler:      maxProbabilisticSampler,
+			shouldErr:            false,
+			referenceEquivalence: false,
+			caption:              "invalid probabilistic strategy",
+		},
+		{
+			res:                  getSamplingStrategyResponse(sampling.SamplingStrategyType_PROBABILISTIC, 0.002),
+			initSampler:          probabilisticSampler,
+			expectedSampler:      probabilisticSampler,
+			shouldErr:            false,
+			referenceEquivalence: true,
+			caption:              "unchanged probabilistic strategy",
+		},
+		{
+			res:                  getSamplingStrategyResponse(sampling.SamplingStrategyType_PROBABILISTIC, 0.003),
+			initSampler:          probabilisticSampler,
+			expectedSampler:      otherProbabilisticSampler,
+			shouldErr:            false,
+			referenceEquivalence: false,
+			caption:              "valid probabilistic strategy",
+		},
+		{
+			res:                  getSamplingStrategyResponse(sampling.SamplingStrategyType_RATE_LIMITING, 2),
+			initSampler:          rateLimitingSampler,
+			expectedSampler:      rateLimitingSampler,
+			shouldErr:            false,
+			referenceEquivalence: true,
+			caption:              "unchanged rate limiting strategy",
+		},
+		{
+			res:                  getSamplingStrategyResponse(sampling.SamplingStrategyType_RATE_LIMITING, 3),
+			initSampler:          rateLimitingSampler,
+			expectedSampler:      otherRateLimitingSampler,
+			shouldErr:            false,
+			referenceEquivalence: false,
+			caption:              "valid rate limiting strategy",
+		},
+		{
+			res:                  &sampling.SamplingStrategyResponse{},
+			initSampler:          rateLimitingSampler,
+			expectedSampler:      rateLimitingSampler,
+			shouldErr:            true,
+			referenceEquivalence: true,
+			caption:              "invalid strategy",
+		},
+	}
+
+	for _, tc := range testCases {
+		testCase := tc // capture loop var
+		t.Run(testCase.caption, func(t *testing.T) {
+			remoteSampler := &RemotelyControlledSampler{samplerOptions: samplerOptions{sampler: testCase.initSampler}}
+			err := remoteSampler.updateRateLimitingOrProbabilisticSampler(testCase.res)
+			if testCase.shouldErr {
+				require.Error(t, err)
+			}
+			if testCase.referenceEquivalence {
+				assert.Equal(t, testCase.expectedSampler, remoteSampler.sampler)
+			} else {
+				assert.True(t, testCase.expectedSampler.Equal(remoteSampler.sampler))
+			}
+		})
+	}
+}
+
+func getSamplingStrategyResponse(strategyType sampling.SamplingStrategyType, value float64) *sampling.SamplingStrategyResponse {
+	if strategyType == sampling.SamplingStrategyType_PROBABILISTIC {
+		return &sampling.SamplingStrategyResponse{
+			StrategyType: sampling.SamplingStrategyType_PROBABILISTIC,
+			ProbabilisticSampling: &sampling.ProbabilisticSamplingStrategy{
+				SamplingRate: value,
+			},
+		}
+	}
+	if strategyType == sampling.SamplingStrategyType_RATE_LIMITING {
+		return &sampling.SamplingStrategyResponse{
+			StrategyType: sampling.SamplingStrategyType_RATE_LIMITING,
+			RateLimitingSampling: &sampling.RateLimitingSamplingStrategy{
+				MaxTracesPerSecond: int16(value),
+			},
+		}
+	}
+	return nil
+}
+
+func TestAdaptiveSampler_lockRaceCondition(t *testing.T) {
+	agent, remoteSampler, _ := initAgent(t)
+	defer agent.Close()
+	remoteSampler.Close() // stop timer-based updates, we want to call them manually
+
+	numOperations := 1000
+	adaptiveSampler, err := NewAdaptiveSampler(
+		&sampling.PerOperationSamplingStrategies{
+			DefaultSamplingProbability: 1,
+		},
+		2000,
+	)
+	require.NoError(t, err)
+
+	// Overwrite the sampler with an adaptive sampler
+	remoteSampler.sampler = adaptiveSampler
+
+	var wg sync.WaitGroup
+	defer wg.Wait()
+	wg.Add(2)
+
+	// Start 2 go routines that will simulate simultaneous calls to IsSampled
+	go func() {
+		defer wg.Done()
+		isSampled(t, remoteSampler, numOperations, "a")
+	}()
+	go func() {
+		defer wg.Done()
+		isSampled(t, remoteSampler, numOperations, "b")
+	}()
+}
+
+func isSampled(t *testing.T, remoteSampler *RemotelyControlledSampler, numOperations int, operationNamePrefix string) {
+	for i := 0; i < numOperations; i++ {
+		runtime.Gosched()
+		sampled, _ := remoteSampler.IsSampled(TraceID{}, fmt.Sprintf("%s%d", operationNamePrefix, i))
+		assert.True(t, sampled)
+	}
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/scripts/cover.sh

@@ -0,0 +1,60 @@
+#!/bin/bash
+
+set -e
+
+COVER=.cover
+ROOT_PKG=github.com/uber/jaeger-client-go/
+
+if [[ -d "$COVER" ]]; then
+	rm -rf "$COVER"
+fi
+mkdir -p "$COVER"
+
+# If a package directory has a .nocover file, don't count it when calculating
+# coverage.
+filter=""
+for pkg in "$@"; do
+	if [[ -f "$GOPATH/src/$pkg/.nocover" ]]; then
+		if [[ -n "$filter" ]]; then
+			filter="$filter, "
+		fi
+		filter="\"$pkg\": true"
+	fi
+done
+
+
+i=0
+for pkg in "$@"; do
+	i=$((i + 1))
+
+	extracoverpkg=""
+	if [[ -f "$GOPATH/src/$pkg/.extra-coverpkg" ]]; then
+		extracoverpkg=$( \
+			sed -e "s|^|$pkg/|g" < "$GOPATH/src/$pkg/.extra-coverpkg" \
+			| tr '\n' ',')
+	fi
+
+	coverpkg=$(go list -json "$pkg" | jq -r '
+		.Deps
+		| . + ["'"$pkg"'"]
+		| map
+			( select(startswith("'"$ROOT_PKG"'"))
+			| select(contains("/vendor/") | not)
+			| select(in({'"$filter"'}) | not)
+			)
+		| join(",")
+	')
+	if [[ -n "$extracoverpkg" ]]; then
+		coverpkg="$extracoverpkg$coverpkg"
+	fi
+
+	args=""
+	if [[ -n "$coverpkg" ]]; then
+		args="-coverprofile $COVER/cover.${i}.out" # -coverpkg $coverpkg"
+	fi
+
+	echo go test -v -race "$pkg"
+	go test $args -v -race "$pkg"
+done
+
+gocovmerge "$COVER"/*.out > cover.out

vendor/src/github.com/jaegertracing/jaeger-client-go/scripts/updateLicense.py

@@ -0,0 +1,120 @@
+from __future__ import (
+    absolute_import, print_function, division, unicode_literals
+)
+
+import logging
+import re
+import sys
+from datetime import datetime
+
+logging.basicConfig(level=logging.DEBUG)
+logger = logging.getLogger(__name__)
+
+CURRENT_YEAR = datetime.today().year
+
+MIT_LICENSE_BLOB = """Copyright (c) %d Uber Technologies, Inc.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.""" % CURRENT_YEAR
+
+LICENSE_BLOB = """Copyright (c) %d Uber Technologies, Inc.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.""" % CURRENT_YEAR
+
+MIT_LICENSE_BLOB_LINES_GO = [
+    ('// ' + l).strip() + '\n' for l in MIT_LICENSE_BLOB.split('\n')
+]
+
+LICENSE_BLOB_LINES_GO = [
+    ('// ' + l).strip() + '\n' for l in LICENSE_BLOB.split('\n')
+]
+
+COPYRIGHT_RE = re.compile(r'Copyright \(c\) (\d+)', re.I)
+
+
+def update_go_license(name, force=False):
+    with open(name) as f:
+        orig_lines = list(f)
+    lines = list(orig_lines)
+
+    current_header = ''.join(lines[0:len(MIT_LICENSE_BLOB_LINES_GO)])
+    mit_header = ''.join(MIT_LICENSE_BLOB_LINES_GO)
+    if current_header == mit_header:
+        lines = lines[len(MIT_LICENSE_BLOB_LINES_GO)+1:]
+
+    found = False
+    changed = False
+    for i, line in enumerate(lines[:5]):
+        m = COPYRIGHT_RE.search(line)
+        if not m:
+            continue
+
+        found = True
+        year = int(m.group(1))
+        if year == CURRENT_YEAR:
+            break
+
+        new_line = COPYRIGHT_RE.sub('Copyright (c) %d' % CURRENT_YEAR, line)
+        assert line != new_line, ('Could not change year in: %s' % line)
+        lines[i] = new_line
+        changed = True
+        break
+
+    if not found:
+        if 'Code generated by' in lines[0]:
+            lines[1:1] = ['\n'] + LICENSE_BLOB_LINES_GO
+        else:
+            lines[0:0] = LICENSE_BLOB_LINES_GO + ['\n']
+        changed = True
+
+    if changed:
+        with open(name, 'w') as f:
+            for line in lines:
+                f.write(line)
+        print(name)
+
+
+def main():
+    if len(sys.argv) == 1:
+        print('USAGE: %s FILE ...' % sys.argv[0])
+        sys.exit(1)
+
+    for name in sys.argv[1:]:
+        if name.endswith('.go'):
+            try:
+                update_go_license(name)
+            except Exception as error:
+                logger.error('Failed to process file %s', name)
+                logger.exception(error)
+                raise error
+        else:
+            raise NotImplementedError('Unsupported file type: %s' % name)
+
+
+if __name__ == "__main__":
+    main()

vendor/src/github.com/jaegertracing/jaeger-client-go/scripts/updateLicenses.sh

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+set -e
+
+python scripts/updateLicense.py $(git ls-files "*\.go" | grep -v thrift-gen | grep -v tracetest)

vendor/src/github.com/jaegertracing/jaeger-client-go/span.go

@@ -0,0 +1,242 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package jaeger
+
+import (
+	"sync"
+	"time"
+
+	"github.com/opentracing/opentracing-go"
+	"github.com/opentracing/opentracing-go/ext"
+	"github.com/opentracing/opentracing-go/log"
+)
+
+// Span implements opentracing.Span
+type Span struct {
+	sync.RWMutex
+
+	tracer *Tracer
+
+	context SpanContext
+
+	// The name of the "operation" this span is an instance of.
+	// Known as a "span name" in some implementations.
+	operationName string
+
+	// firstInProcess, if true, indicates that this span is the root of the (sub)tree
+	// of spans in the current process. In other words it's true for the root spans,
+	// and the ingress spans when the process joins another trace.
+	firstInProcess bool
+
+	// startTime is the timestamp indicating when the span began, with microseconds precision.
+	startTime time.Time
+
+	// duration returns duration of the span with microseconds precision.
+	// Zero value means duration is unknown.
+	duration time.Duration
+
+	// tags attached to this span
+	tags []Tag
+
+	// The span's "micro-log"
+	logs []opentracing.LogRecord
+
+	// references for this span
+	references []Reference
+
+	observer ContribSpanObserver
+}
+
+// Tag is a simple key value wrapper.
+// TODO deprecate in the next major release, use opentracing.Tag instead.
+type Tag struct {
+	key   string
+	value interface{}
+}
+
+// SetOperationName sets or changes the operation name.
+func (s *Span) SetOperationName(operationName string) opentracing.Span {
+	s.Lock()
+	defer s.Unlock()
+	if s.context.IsSampled() {
+		s.operationName = operationName
+	}
+	s.observer.OnSetOperationName(operationName)
+	return s
+}
+
+// SetTag implements SetTag() of opentracing.Span
+func (s *Span) SetTag(key string, value interface{}) opentracing.Span {
+	s.observer.OnSetTag(key, value)
+	if key == string(ext.SamplingPriority) && setSamplingPriority(s, value) {
+		return s
+	}
+	s.Lock()
+	defer s.Unlock()
+	if s.context.IsSampled() {
+		s.setTagNoLocking(key, value)
+	}
+	return s
+}
+
+func (s *Span) setTagNoLocking(key string, value interface{}) {
+	s.tags = append(s.tags, Tag{key: key, value: value})
+}
+
+// LogFields implements opentracing.Span API
+func (s *Span) LogFields(fields ...log.Field) {
+	s.Lock()
+	defer s.Unlock()
+	if !s.context.IsSampled() {
+		return
+	}
+	s.logFieldsNoLocking(fields...)
+}
+
+// this function should only be called while holding a Write lock
+func (s *Span) logFieldsNoLocking(fields ...log.Field) {
+	lr := opentracing.LogRecord{
+		Fields:    fields,
+		Timestamp: time.Now(),
+	}
+	s.appendLog(lr)
+}
+
+// LogKV implements opentracing.Span API
+func (s *Span) LogKV(alternatingKeyValues ...interface{}) {
+	s.RLock()
+	sampled := s.context.IsSampled()
+	s.RUnlock()
+	if !sampled {
+		return
+	}
+	fields, err := log.InterleavedKVToFields(alternatingKeyValues...)
+	if err != nil {
+		s.LogFields(log.Error(err), log.String("function", "LogKV"))
+		return
+	}
+	s.LogFields(fields...)
+}
+
+// LogEvent implements opentracing.Span API
+func (s *Span) LogEvent(event string) {
+	s.Log(opentracing.LogData{Event: event})
+}
+
+// LogEventWithPayload implements opentracing.Span API
+func (s *Span) LogEventWithPayload(event string, payload interface{}) {
+	s.Log(opentracing.LogData{Event: event, Payload: payload})
+}
+
+// Log implements opentracing.Span API
+func (s *Span) Log(ld opentracing.LogData) {
+	s.Lock()
+	defer s.Unlock()
+	if s.context.IsSampled() {
+		if ld.Timestamp.IsZero() {
+			ld.Timestamp = s.tracer.timeNow()
+		}
+		s.appendLog(ld.ToLogRecord())
+	}
+}
+
+// this function should only be called while holding a Write lock
+func (s *Span) appendLog(lr opentracing.LogRecord) {
+	// TODO add logic to limit number of logs per span (issue #46)
+	s.logs = append(s.logs, lr)
+}
+
+// SetBaggageItem implements SetBaggageItem() of opentracing.SpanContext
+func (s *Span) SetBaggageItem(key, value string) opentracing.Span {
+	s.Lock()
+	defer s.Unlock()
+	s.tracer.setBaggage(s, key, value)
+	return s
+}
+
+// BaggageItem implements BaggageItem() of opentracing.SpanContext
+func (s *Span) BaggageItem(key string) string {
+	s.RLock()
+	defer s.RUnlock()
+	return s.context.baggage[key]
+}
+
+// Finish implements opentracing.Span API
+func (s *Span) Finish() {
+	s.FinishWithOptions(opentracing.FinishOptions{})
+}
+
+// FinishWithOptions implements opentracing.Span API
+func (s *Span) FinishWithOptions(options opentracing.FinishOptions) {
+	if options.FinishTime.IsZero() {
+		options.FinishTime = s.tracer.timeNow()
+	}
+	s.observer.OnFinish(options)
+	s.Lock()
+	if s.context.IsSampled() {
+		s.duration = options.FinishTime.Sub(s.startTime)
+		// Note: bulk logs are not subject to maxLogsPerSpan limit
+		if options.LogRecords != nil {
+			s.logs = append(s.logs, options.LogRecords...)
+		}
+		for _, ld := range options.BulkLogData {
+			s.logs = append(s.logs, ld.ToLogRecord())
+		}
+	}
+	s.Unlock()
+	// call reportSpan even for non-sampled traces, to return span to the pool
+	s.tracer.reportSpan(s)
+}
+
+// Context implements opentracing.Span API
+func (s *Span) Context() opentracing.SpanContext {
+	return s.context
+}
+
+// Tracer implements opentracing.Span API
+func (s *Span) Tracer() opentracing.Tracer {
+	return s.tracer
+}
+
+func (s *Span) String() string {
+	s.RLock()
+	defer s.RUnlock()
+	return s.context.String()
+}
+
+// OperationName allows retrieving current operation name.
+func (s *Span) OperationName() string {
+	s.RLock()
+	defer s.RUnlock()
+	return s.operationName
+}
+
+func (s *Span) serviceName() string {
+	return s.tracer.serviceName
+}
+
+func setSamplingPriority(s *Span, value interface{}) bool {
+	s.Lock()
+	defer s.Unlock()
+	if val, ok := value.(uint16); ok {
+		if val > 0 {
+			s.context.flags = s.context.flags | flagDebug | flagSampled
+		} else {
+			s.context.flags = s.context.flags & (^flagSampled)
+		}
+		return true
+	}
+	return false
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/span_test.go

@@ -0,0 +1,90 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package jaeger
+
+import (
+	"testing"
+
+	"github.com/opentracing/opentracing-go"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestBaggageIterator(t *testing.T) {
+	service := "DOOP"
+	tracer, closer := NewTracer(service, NewConstSampler(true), NewNullReporter())
+	defer closer.Close()
+
+	sp1 := tracer.StartSpan("s1").(*Span)
+	sp1.SetBaggageItem("Some_Key", "12345")
+	sp1.SetBaggageItem("Some-other-key", "42")
+	expectedBaggage := map[string]string{"Some_Key": "12345", "Some-other-key": "42"}
+	assertBaggage(t, sp1, expectedBaggage)
+	assertBaggageRecords(t, sp1, expectedBaggage)
+
+	b := extractBaggage(sp1, false) // break out early
+	assert.Equal(t, 1, len(b), "only one baggage item should be extracted")
+
+	sp2 := tracer.StartSpan("s2", opentracing.ChildOf(sp1.Context())).(*Span)
+	assertBaggage(t, sp2, expectedBaggage) // child inherits the same baggage
+	require.Len(t, sp2.logs, 0)            // child doesn't inherit the baggage logs
+}
+
+func assertBaggageRecords(t *testing.T, sp *Span, expected map[string]string) {
+	require.Len(t, sp.logs, len(expected))
+	for _, logRecord := range sp.logs {
+		require.Len(t, logRecord.Fields, 3)
+		require.Equal(t, "event:baggage", logRecord.Fields[0].String())
+		key := logRecord.Fields[1].Value().(string)
+		value := logRecord.Fields[2].Value().(string)
+
+		require.Contains(t, expected, key)
+		assert.Equal(t, expected[key], value)
+	}
+}
+
+func assertBaggage(t *testing.T, sp opentracing.Span, expected map[string]string) {
+	b := extractBaggage(sp, true)
+	assert.Equal(t, expected, b)
+}
+
+func extractBaggage(sp opentracing.Span, allItems bool) map[string]string {
+	b := make(map[string]string)
+	sp.Context().ForeachBaggageItem(func(k, v string) bool {
+		b[k] = v
+		return allItems
+	})
+	return b
+}
+
+func TestSpanProperties(t *testing.T) {
+	tracer, closer := NewTracer("DOOP", NewConstSampler(true), NewNullReporter())
+	defer closer.Close()
+
+	sp1 := tracer.StartSpan("s1").(*Span)
+	assert.Equal(t, tracer, sp1.Tracer())
+	assert.NotNil(t, sp1.Context())
+}
+
+func TestSpanOperationName(t *testing.T) {
+	tracer, closer := NewTracer("DOOP", NewConstSampler(true), NewNullReporter())
+	defer closer.Close()
+
+	sp1 := tracer.StartSpan("s1").(*Span)
+	sp1.SetOperationName("s2")
+	sp1.Finish()
+
+	assert.Equal(t, "s2", sp1.OperationName())
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/testutils/mock_agent.go

@@ -0,0 +1,189 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package testutils
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"sync"
+	"sync/atomic"
+
+	"github.com/apache/thrift/lib/go/thrift"
+
+	"github.com/uber/jaeger-client-go/thrift-gen/agent"
+	"github.com/uber/jaeger-client-go/thrift-gen/jaeger"
+	"github.com/uber/jaeger-client-go/thrift-gen/sampling"
+	"github.com/uber/jaeger-client-go/thrift-gen/zipkincore"
+	"github.com/uber/jaeger-client-go/utils"
+)
+
+// StartMockAgent runs a mock representation of jaeger-agent.
+// This function returns a started server.
+func StartMockAgent() (*MockAgent, error) {
+	transport, err := NewTUDPServerTransport("127.0.0.1:0")
+	if err != nil {
+		return nil, err
+	}
+
+	samplingManager := newSamplingManager()
+	samplingHandler := &samplingHandler{manager: samplingManager}
+	samplingServer := httptest.NewServer(samplingHandler)
+
+	agent := &MockAgent{
+		transport:   transport,
+		samplingMgr: samplingManager,
+		samplingSrv: samplingServer,
+	}
+
+	var started sync.WaitGroup
+	started.Add(1)
+	go agent.serve(&started)
+	started.Wait()
+
+	return agent, nil
+}
+
+// Close stops the serving of traffic
+func (s *MockAgent) Close() {
+	atomic.StoreUint32(&s.serving, 0)
+	s.transport.Close()
+	s.samplingSrv.Close()
+}
+
+// MockAgent is a mock representation of Jaeger Agent.
+// It receives spans over UDP, and has an HTTP endpoint for sampling strategies.
+type MockAgent struct {
+	transport     *TUDPTransport
+	jaegerBatches []*jaeger.Batch
+	mutex         sync.Mutex
+	serving       uint32
+	samplingMgr   *samplingManager
+	samplingSrv   *httptest.Server
+}
+
+// SpanServerAddr returns the UDP host:port where MockAgent listens for spans
+func (s *MockAgent) SpanServerAddr() string {
+	return s.transport.Addr().String()
+}
+
+// SpanServerClient returns a UDP client that can be used to send spans to the MockAgent
+func (s *MockAgent) SpanServerClient() (agent.Agent, error) {
+	return utils.NewAgentClientUDP(s.SpanServerAddr(), 0)
+}
+
+// SamplingServerAddr returns the host:port of HTTP server exposing sampling strategy endpoint
+func (s *MockAgent) SamplingServerAddr() string {
+	return s.samplingSrv.Listener.Addr().String()
+}
+
+func (s *MockAgent) serve(started *sync.WaitGroup) {
+	handler := agent.NewAgentProcessor(s)
+	protocolFact := thrift.NewTCompactProtocolFactory()
+	buf := make([]byte, utils.UDPPacketMaxLength, utils.UDPPacketMaxLength)
+	trans := thrift.NewTMemoryBufferLen(utils.UDPPacketMaxLength)
+
+	atomic.StoreUint32(&s.serving, 1)
+	started.Done()
+	for s.IsServing() {
+		n, err := s.transport.Read(buf)
+		if err == nil {
+			trans.Write(buf[:n])
+			protocol := protocolFact.GetProtocol(trans)
+			handler.Process(protocol, protocol)
+		}
+	}
+}
+
+// EmitZipkinBatch is deprecated, use EmitBatch
+func (s *MockAgent) EmitZipkinBatch(spans []*zipkincore.Span) (err error) {
+	// TODO remove this for 3.0.0
+	return errors.New("Not implemented")
+}
+
+// GetZipkinSpans is deprecated use GetJaegerBatches
+func (s *MockAgent) GetZipkinSpans() []*zipkincore.Span {
+	return nil
+}
+
+// ResetZipkinSpans is deprecated use ResetJaegerBatches
+func (s *MockAgent) ResetZipkinSpans() {}
+
+// EmitBatch implements EmitBatch() of TChanSamplingManagerServer
+func (s *MockAgent) EmitBatch(batch *jaeger.Batch) (err error) {
+	s.mutex.Lock()
+	defer s.mutex.Unlock()
+	s.jaegerBatches = append(s.jaegerBatches, batch)
+	return err
+}
+
+// IsServing indicates whether the server is currently serving traffic
+func (s *MockAgent) IsServing() bool {
+	return atomic.LoadUint32(&s.serving) == 1
+}
+
+// AddSamplingStrategy registers a sampling strategy for a service
+func (s *MockAgent) AddSamplingStrategy(service string, strategy *sampling.SamplingStrategyResponse) {
+	s.samplingMgr.AddSamplingStrategy(service, strategy)
+}
+
+// GetJaegerBatches returns accumulated Jaeger batches
+func (s *MockAgent) GetJaegerBatches() []*jaeger.Batch {
+	s.mutex.Lock()
+	defer s.mutex.Unlock()
+	n := len(s.jaegerBatches)
+	batches := make([]*jaeger.Batch, n, n)
+	copy(batches, s.jaegerBatches)
+	return batches
+}
+
+// ResetJaegerBatches discards accumulated Jaeger batches
+func (s *MockAgent) ResetJaegerBatches() {
+	s.mutex.Lock()
+	defer s.mutex.Unlock()
+	s.jaegerBatches = nil
+}
+
+type samplingHandler struct {
+	manager *samplingManager
+}
+
+func (h *samplingHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	services := r.URL.Query()["service"]
+	if len(services) == 0 {
+		http.Error(w, "'service' parameter is empty", http.StatusBadRequest)
+		return
+	}
+	if len(services) > 1 {
+		http.Error(w, "'service' parameter must occur only once", http.StatusBadRequest)
+		return
+	}
+	resp, err := h.manager.GetSamplingStrategy(services[0])
+	if err != nil {
+		http.Error(w, fmt.Sprintf("Error retrieving strategy: %+v", err), http.StatusInternalServerError)
+		return
+	}
+	json, err := json.Marshal(resp)
+	if err != nil {
+		http.Error(w, "Cannot marshall Thrift to JSON", http.StatusInternalServerError)
+		return
+	}
+	w.Header().Add("Content-Type", "application/json")
+	if _, err := w.Write(json); err != nil {
+		return
+	}
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/testutils/mock_agent_test.go

@@ -0,0 +1,93 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package testutils
+
+import (
+	"fmt"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/uber/jaeger-client-go/thrift-gen/jaeger"
+	"github.com/uber/jaeger-client-go/thrift-gen/sampling"
+	"github.com/uber/jaeger-client-go/utils"
+)
+
+func TestMockAgentSpanServer(t *testing.T) {
+	mockAgent, err := StartMockAgent()
+	require.NoError(t, err)
+	defer mockAgent.Close()
+
+	client, err := mockAgent.SpanServerClient()
+	require.NoError(t, err)
+
+	for i := 1; i < 5; i++ {
+		batch := &jaeger.Batch{Process: &jaeger.Process{ServiceName: "svc"}}
+		spans := make([]*jaeger.Span, i, i)
+		for j := 0; j < i; j++ {
+			spans[j] = jaeger.NewSpan()
+			spans[j].OperationName = fmt.Sprintf("span-%d", j)
+		}
+		batch.Spans = spans
+
+		err = client.EmitBatch(batch)
+		assert.NoError(t, err)
+
+		for k := 0; k < 100; k++ {
+			time.Sleep(time.Millisecond)
+			batches := mockAgent.GetJaegerBatches()
+			if len(batches) > 0 && len(batches[0].Spans) == i {
+				break
+			}
+		}
+		batches := mockAgent.GetJaegerBatches()
+		require.NotEmpty(t, len(batches))
+		require.Equal(t, i, len(batches[0].Spans))
+		for j := 0; j < i; j++ {
+			assert.Equal(t, fmt.Sprintf("span-%d", j), batches[0].Spans[j].OperationName)
+		}
+		mockAgent.ResetJaegerBatches()
+	}
+}
+
+func TestMockAgentSamplingManager(t *testing.T) {
+	mockAgent, err := StartMockAgent()
+	require.NoError(t, err)
+	defer mockAgent.Close()
+
+	err = utils.GetJSON("http://"+mockAgent.SamplingServerAddr()+"/", nil)
+	require.Error(t, err, "no 'service' parameter")
+	err = utils.GetJSON("http://"+mockAgent.SamplingServerAddr()+"/?service=a&service=b", nil)
+	require.Error(t, err, "Too many 'service' parameters")
+
+	var resp sampling.SamplingStrategyResponse
+	err = utils.GetJSON("http://"+mockAgent.SamplingServerAddr()+"/?service=something", &resp)
+	require.NoError(t, err)
+	assert.Equal(t, sampling.SamplingStrategyType_PROBABILISTIC, resp.StrategyType)
+
+	mockAgent.AddSamplingStrategy("service123", &sampling.SamplingStrategyResponse{
+		StrategyType: sampling.SamplingStrategyType_RATE_LIMITING,
+		RateLimitingSampling: &sampling.RateLimitingSamplingStrategy{
+			MaxTracesPerSecond: 123,
+		},
+	})
+	err = utils.GetJSON("http://"+mockAgent.SamplingServerAddr()+"/?service=service123", &resp)
+	require.NoError(t, err)
+	assert.Equal(t, sampling.SamplingStrategyType_RATE_LIMITING, resp.StrategyType)
+	require.NotNil(t, resp.RateLimitingSampling)
+	assert.EqualValues(t, 123, resp.RateLimitingSampling.MaxTracesPerSecond)
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/testutils/sampling_manager.go

@@ -0,0 +1,53 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package testutils
+
+import (
+	"sync"
+
+	"github.com/uber/jaeger-client-go/thrift-gen/sampling"
+)
+
+func newSamplingManager() *samplingManager {
+	return &samplingManager{
+		sampling: make(map[string]*sampling.SamplingStrategyResponse),
+	}
+}
+
+type samplingManager struct {
+	sampling map[string]*sampling.SamplingStrategyResponse
+	mutex    sync.Mutex
+}
+
+// GetSamplingStrategy implements handler method of sampling.SamplingManager
+func (s *samplingManager) GetSamplingStrategy(serviceName string) (*sampling.SamplingStrategyResponse, error) {
+	s.mutex.Lock()
+	defer s.mutex.Unlock()
+	if strategy, ok := s.sampling[serviceName]; ok {
+		return strategy, nil
+	}
+	return &sampling.SamplingStrategyResponse{
+		StrategyType: sampling.SamplingStrategyType_PROBABILISTIC,
+		ProbabilisticSampling: &sampling.ProbabilisticSamplingStrategy{
+			SamplingRate: 0.01,
+		}}, nil
+}
+
+// AddSamplingStrategy registers a sampling strategy for a service
+func (s *samplingManager) AddSamplingStrategy(service string, strategy *sampling.SamplingStrategyResponse) {
+	s.mutex.Lock()
+	defer s.mutex.Unlock()
+	s.sampling[service] = strategy
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/testutils/udp_transport.go

@@ -0,0 +1,106 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package testutils
+
+import (
+	"bytes"
+	"net"
+	"sync/atomic"
+
+	"github.com/apache/thrift/lib/go/thrift"
+)
+
+const (
+	// used in RemainingBytes()
+	maxRemainingBytes = ^uint64(0)
+)
+
+// TUDPTransport does UDP as a thrift.TTransport (read-only, write functions not implemented).
+type TUDPTransport struct {
+	conn     *net.UDPConn
+	addr     net.Addr
+	writeBuf bytes.Buffer
+	closed   uint32
+}
+
+// NewTUDPServerTransport creates a net.UDPConn-backed TTransport for Thrift servers
+// It will listen for incoming udp packets on the specified host/port
+// Example:
+// 	trans, err := utils.NewTUDPClientTransport("localhost:9001")
+func NewTUDPServerTransport(hostPort string) (*TUDPTransport, error) {
+	addr, err := net.ResolveUDPAddr("udp", hostPort)
+	if err != nil {
+		return nil, thrift.NewTTransportException(thrift.NOT_OPEN, err.Error())
+	}
+	conn, err := net.ListenUDP(addr.Network(), addr)
+	if err != nil {
+		return nil, thrift.NewTTransportException(thrift.NOT_OPEN, err.Error())
+	}
+	return &TUDPTransport{addr: conn.LocalAddr(), conn: conn}, nil
+}
+
+// Open does nothing as connection is opened on creation
+// Required to maintain thrift.TTransport interface
+func (p *TUDPTransport) Open() error {
+	return nil
+}
+
+// Conn retrieves the underlying net.UDPConn
+func (p *TUDPTransport) Conn() *net.UDPConn {
+	return p.conn
+}
+
+// IsOpen returns true if the connection is open
+func (p *TUDPTransport) IsOpen() bool {
+	return p.conn != nil && atomic.LoadUint32(&p.closed) == 0
+}
+
+// Close closes the connection
+func (p *TUDPTransport) Close() error {
+	if p.conn != nil && atomic.CompareAndSwapUint32(&p.closed, 0, 1) {
+		return p.conn.Close()
+	}
+	return nil
+}
+
+// Addr returns the address that the transport is listening on or writing to
+func (p *TUDPTransport) Addr() net.Addr {
+	return p.addr
+}
+
+// Read reads one UDP packet and puts it in the specified buf
+func (p *TUDPTransport) Read(buf []byte) (int, error) {
+	if !p.IsOpen() {
+		return 0, thrift.NewTTransportException(thrift.NOT_OPEN, "Connection not open")
+	}
+	n, err := p.conn.Read(buf)
+	return n, thrift.NewTTransportExceptionFromError(err)
+}
+
+// RemainingBytes returns the max number of bytes (same as Thrift's StreamTransport) as we
+// do not know how many bytes we have left.
+func (p *TUDPTransport) RemainingBytes() uint64 {
+	return maxRemainingBytes
+}
+
+// Write writes specified buf to the write buffer
+func (p *TUDPTransport) Write(buf []byte) (int, error) {
+	return 0, thrift.NewTTransportException(thrift.UNKNOWN_TRANSPORT_EXCEPTION, "Write not implemented")
+}
+
+// Flush flushes the write buffer as one udp packet
+func (p *TUDPTransport) Flush() error {
+	return thrift.NewTTransportException(thrift.UNKNOWN_TRANSPORT_EXCEPTION, "Flush not implemented")
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/testutils/udp_transport_test.go

@@ -0,0 +1,67 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package testutils
+
+import (
+	"net"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestUDPTransport(t *testing.T) {
+	server, err := NewTUDPServerTransport("127.0.0.1:0")
+	require.NoError(t, err)
+	defer server.Close()
+
+	assert.NoError(t, server.Open())
+	assert.True(t, server.IsOpen())
+	assert.NotNil(t, server.Conn())
+
+	c := make(chan []byte)
+	defer close(c)
+
+	go serveOnce(t, server, c)
+
+	destAddr, err := net.ResolveUDPAddr("udp", server.Addr().String())
+	require.NoError(t, err)
+
+	connUDP, err := net.DialUDP(destAddr.Network(), nil, destAddr)
+	require.NoError(t, err)
+	defer connUDP.Close()
+
+	n, err := connUDP.Write([]byte("test"))
+	assert.NoError(t, err)
+	assert.Equal(t, 4, n)
+
+	select {
+	case data := <-c:
+		assert.Equal(t, "test", string(data))
+	case <-time.After(time.Second * 1):
+		t.Error("Server did not respond in time")
+	}
+}
+
+func serveOnce(t *testing.T, transport *TUDPTransport, c chan []byte) {
+	b := make([]byte, 65000, 65000)
+	n, err := transport.Read(b)
+	if err == nil {
+		c <- b[:n]
+	} else {
+		panic("Server failed to read: " + err.Error())
+	}
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/thrift-gen/agent/agent.go

@@ -0,0 +1,410 @@
+// Autogenerated by Thrift Compiler (0.9.3)
+// DO NOT EDIT UNLESS YOU ARE SURE THAT YOU KNOW WHAT YOU ARE DOING
+
+package agent
+
+import (
+	"bytes"
+	"fmt"
+	"github.com/apache/thrift/lib/go/thrift"
+	"github.com/uber/jaeger-client-go/thrift-gen/jaeger"
+	"github.com/uber/jaeger-client-go/thrift-gen/zipkincore"
+)
+
+// (needed to ensure safety because of naive import list construction.)
+var _ = thrift.ZERO
+var _ = fmt.Printf
+var _ = bytes.Equal
+
+var _ = zipkincore.GoUnusedProtection__
+
+type Agent interface {
+	// Parameters:
+	//  - Spans
+	EmitZipkinBatch(spans []*zipkincore.Span) (err error)
+	// Parameters:
+	//  - Batch
+	EmitBatch(batch *jaeger.Batch) (err error)
+}
+
+type AgentClient struct {
+	Transport       thrift.TTransport
+	ProtocolFactory thrift.TProtocolFactory
+	InputProtocol   thrift.TProtocol
+	OutputProtocol  thrift.TProtocol
+	SeqId           int32
+}
+
+func NewAgentClientFactory(t thrift.TTransport, f thrift.TProtocolFactory) *AgentClient {
+	return &AgentClient{Transport: t,
+		ProtocolFactory: f,
+		InputProtocol:   f.GetProtocol(t),
+		OutputProtocol:  f.GetProtocol(t),
+		SeqId:           0,
+	}
+}
+
+func NewAgentClientProtocol(t thrift.TTransport, iprot thrift.TProtocol, oprot thrift.TProtocol) *AgentClient {
+	return &AgentClient{Transport: t,
+		ProtocolFactory: nil,
+		InputProtocol:   iprot,
+		OutputProtocol:  oprot,
+		SeqId:           0,
+	}
+}
+
+// Parameters:
+//  - Spans
+func (p *AgentClient) EmitZipkinBatch(spans []*zipkincore.Span) (err error) {
+	if err = p.sendEmitZipkinBatch(spans); err != nil {
+		return
+	}
+	return
+}
+
+func (p *AgentClient) sendEmitZipkinBatch(spans []*zipkincore.Span) (err error) {
+	oprot := p.OutputProtocol
+	if oprot == nil {
+		oprot = p.ProtocolFactory.GetProtocol(p.Transport)
+		p.OutputProtocol = oprot
+	}
+	p.SeqId++
+	if err = oprot.WriteMessageBegin("emitZipkinBatch", thrift.ONEWAY, p.SeqId); err != nil {
+		return
+	}
+	args := AgentEmitZipkinBatchArgs{
+		Spans: spans,
+	}
+	if err = args.Write(oprot); err != nil {
+		return
+	}
+	if err = oprot.WriteMessageEnd(); err != nil {
+		return
+	}
+	return oprot.Flush()
+}
+
+// Parameters:
+//  - Batch
+func (p *AgentClient) EmitBatch(batch *jaeger.Batch) (err error) {
+	if err = p.sendEmitBatch(batch); err != nil {
+		return
+	}
+	return
+}
+
+func (p *AgentClient) sendEmitBatch(batch *jaeger.Batch) (err error) {
+	oprot := p.OutputProtocol
+	if oprot == nil {
+		oprot = p.ProtocolFactory.GetProtocol(p.Transport)
+		p.OutputProtocol = oprot
+	}
+	p.SeqId++
+	if err = oprot.WriteMessageBegin("emitBatch", thrift.ONEWAY, p.SeqId); err != nil {
+		return
+	}
+	args := AgentEmitBatchArgs{
+		Batch: batch,
+	}
+	if err = args.Write(oprot); err != nil {
+		return
+	}
+	if err = oprot.WriteMessageEnd(); err != nil {
+		return
+	}
+	return oprot.Flush()
+}
+
+type AgentProcessor struct {
+	processorMap map[string]thrift.TProcessorFunction
+	handler      Agent
+}
+
+func (p *AgentProcessor) AddToProcessorMap(key string, processor thrift.TProcessorFunction) {
+	p.processorMap[key] = processor
+}
+
+func (p *AgentProcessor) GetProcessorFunction(key string) (processor thrift.TProcessorFunction, ok bool) {
+	processor, ok = p.processorMap[key]
+	return processor, ok
+}
+
+func (p *AgentProcessor) ProcessorMap() map[string]thrift.TProcessorFunction {
+	return p.processorMap
+}
+
+func NewAgentProcessor(handler Agent) *AgentProcessor {
+
+	self0 := &AgentProcessor{handler: handler, processorMap: make(map[string]thrift.TProcessorFunction)}
+	self0.processorMap["emitZipkinBatch"] = &agentProcessorEmitZipkinBatch{handler: handler}
+	self0.processorMap["emitBatch"] = &agentProcessorEmitBatch{handler: handler}
+	return self0
+}
+
+func (p *AgentProcessor) Process(iprot, oprot thrift.TProtocol) (success bool, err thrift.TException) {
+	name, _, seqId, err := iprot.ReadMessageBegin()
+	if err != nil {
+		return false, err
+	}
+	if processor, ok := p.GetProcessorFunction(name); ok {
+		return processor.Process(seqId, iprot, oprot)
+	}
+	iprot.Skip(thrift.STRUCT)
+	iprot.ReadMessageEnd()
+	x1 := thrift.NewTApplicationException(thrift.UNKNOWN_METHOD, "Unknown function "+name)
+	oprot.WriteMessageBegin(name, thrift.EXCEPTION, seqId)
+	x1.Write(oprot)
+	oprot.WriteMessageEnd()
+	oprot.Flush()
+	return false, x1
+
+}
+
+type agentProcessorEmitZipkinBatch struct {
+	handler Agent
+}
+
+func (p *agentProcessorEmitZipkinBatch) Process(seqId int32, iprot, oprot thrift.TProtocol) (success bool, err thrift.TException) {
+	args := AgentEmitZipkinBatchArgs{}
+	if err = args.Read(iprot); err != nil {
+		iprot.ReadMessageEnd()
+		return false, err
+	}
+
+	iprot.ReadMessageEnd()
+	var err2 error
+	if err2 = p.handler.EmitZipkinBatch(args.Spans); err2 != nil {
+		return true, err2
+	}
+	return true, nil
+}
+
+type agentProcessorEmitBatch struct {
+	handler Agent
+}
+
+func (p *agentProcessorEmitBatch) Process(seqId int32, iprot, oprot thrift.TProtocol) (success bool, err thrift.TException) {
+	args := AgentEmitBatchArgs{}
+	if err = args.Read(iprot); err != nil {
+		iprot.ReadMessageEnd()
+		return false, err
+	}
+
+	iprot.ReadMessageEnd()
+	var err2 error
+	if err2 = p.handler.EmitBatch(args.Batch); err2 != nil {
+		return true, err2
+	}
+	return true, nil
+}
+
+// HELPER FUNCTIONS AND STRUCTURES
+
+// Attributes:
+//  - Spans
+type AgentEmitZipkinBatchArgs struct {
+	Spans []*zipkincore.Span `thrift:"spans,1" json:"spans"`
+}
+
+func NewAgentEmitZipkinBatchArgs() *AgentEmitZipkinBatchArgs {
+	return &AgentEmitZipkinBatchArgs{}
+}
+
+func (p *AgentEmitZipkinBatchArgs) GetSpans() []*zipkincore.Span {
+	return p.Spans
+}
+func (p *AgentEmitZipkinBatchArgs) Read(iprot thrift.TProtocol) error {
+	if _, err := iprot.ReadStructBegin(); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T read error: ", p), err)
+	}
+
+	for {
+		_, fieldTypeId, fieldId, err := iprot.ReadFieldBegin()
+		if err != nil {
+			return thrift.PrependError(fmt.Sprintf("%T field %d read error: ", p, fieldId), err)
+		}
+		if fieldTypeId == thrift.STOP {
+			break
+		}
+		switch fieldId {
+		case 1:
+			if err := p.readField1(iprot); err != nil {
+				return err
+			}
+		default:
+			if err := iprot.Skip(fieldTypeId); err != nil {
+				return err
+			}
+		}
+		if err := iprot.ReadFieldEnd(); err != nil {
+			return err
+		}
+	}
+	if err := iprot.ReadStructEnd(); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T read struct end error: ", p), err)
+	}
+	return nil
+}
+
+func (p *AgentEmitZipkinBatchArgs) readField1(iprot thrift.TProtocol) error {
+	_, size, err := iprot.ReadListBegin()
+	if err != nil {
+		return thrift.PrependError("error reading list begin: ", err)
+	}
+	tSlice := make([]*zipkincore.Span, 0, size)
+	p.Spans = tSlice
+	for i := 0; i < size; i++ {
+		_elem2 := &zipkincore.Span{}
+		if err := _elem2.Read(iprot); err != nil {
+			return thrift.PrependError(fmt.Sprintf("%T error reading struct: ", _elem2), err)
+		}
+		p.Spans = append(p.Spans, _elem2)
+	}
+	if err := iprot.ReadListEnd(); err != nil {
+		return thrift.PrependError("error reading list end: ", err)
+	}
+	return nil
+}
+
+func (p *AgentEmitZipkinBatchArgs) Write(oprot thrift.TProtocol) error {
+	if err := oprot.WriteStructBegin("emitZipkinBatch_args"); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T write struct begin error: ", p), err)
+	}
+	if err := p.writeField1(oprot); err != nil {
+		return err
+	}
+	if err := oprot.WriteFieldStop(); err != nil {
+		return thrift.PrependError("write field stop error: ", err)
+	}
+	if err := oprot.WriteStructEnd(); err != nil {
+		return thrift.PrependError("write struct stop error: ", err)
+	}
+	return nil
+}
+
+func (p *AgentEmitZipkinBatchArgs) writeField1(oprot thrift.TProtocol) (err error) {
+	if err := oprot.WriteFieldBegin("spans", thrift.LIST, 1); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T write field begin error 1:spans: ", p), err)
+	}
+	if err := oprot.WriteListBegin(thrift.STRUCT, len(p.Spans)); err != nil {
+		return thrift.PrependError("error writing list begin: ", err)
+	}
+	for _, v := range p.Spans {
+		if err := v.Write(oprot); err != nil {
+			return thrift.PrependError(fmt.Sprintf("%T error writing struct: ", v), err)
+		}
+	}
+	if err := oprot.WriteListEnd(); err != nil {
+		return thrift.PrependError("error writing list end: ", err)
+	}
+	if err := oprot.WriteFieldEnd(); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T write field end error 1:spans: ", p), err)
+	}
+	return err
+}
+
+func (p *AgentEmitZipkinBatchArgs) String() string {
+	if p == nil {
+		return "<nil>"
+	}
+	return fmt.Sprintf("AgentEmitZipkinBatchArgs(%+v)", *p)
+}
+
+// Attributes:
+//  - Batch
+type AgentEmitBatchArgs struct {
+	Batch *jaeger.Batch `thrift:"batch,1" json:"batch"`
+}
+
+func NewAgentEmitBatchArgs() *AgentEmitBatchArgs {
+	return &AgentEmitBatchArgs{}
+}
+
+var AgentEmitBatchArgs_Batch_DEFAULT *jaeger.Batch
+
+func (p *AgentEmitBatchArgs) GetBatch() *jaeger.Batch {
+	if !p.IsSetBatch() {
+		return AgentEmitBatchArgs_Batch_DEFAULT
+	}
+	return p.Batch
+}
+func (p *AgentEmitBatchArgs) IsSetBatch() bool {
+	return p.Batch != nil
+}
+
+func (p *AgentEmitBatchArgs) Read(iprot thrift.TProtocol) error {
+	if _, err := iprot.ReadStructBegin(); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T read error: ", p), err)
+	}
+
+	for {
+		_, fieldTypeId, fieldId, err := iprot.ReadFieldBegin()
+		if err != nil {
+			return thrift.PrependError(fmt.Sprintf("%T field %d read error: ", p, fieldId), err)
+		}
+		if fieldTypeId == thrift.STOP {
+			break
+		}
+		switch fieldId {
+		case 1:
+			if err := p.readField1(iprot); err != nil {
+				return err
+			}
+		default:
+			if err := iprot.Skip(fieldTypeId); err != nil {
+				return err
+			}
+		}
+		if err := iprot.ReadFieldEnd(); err != nil {
+			return err
+		}
+	}
+	if err := iprot.ReadStructEnd(); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T read struct end error: ", p), err)
+	}
+	return nil
+}
+
+func (p *AgentEmitBatchArgs) readField1(iprot thrift.TProtocol) error {
+	p.Batch = &jaeger.Batch{}
+	if err := p.Batch.Read(iprot); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T error reading struct: ", p.Batch), err)
+	}
+	return nil
+}
+
+func (p *AgentEmitBatchArgs) Write(oprot thrift.TProtocol) error {
+	if err := oprot.WriteStructBegin("emitBatch_args"); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T write struct begin error: ", p), err)
+	}
+	if err := p.writeField1(oprot); err != nil {
+		return err
+	}
+	if err := oprot.WriteFieldStop(); err != nil {
+		return thrift.PrependError("write field stop error: ", err)
+	}
+	if err := oprot.WriteStructEnd(); err != nil {
+		return thrift.PrependError("write struct stop error: ", err)
+	}
+	return nil
+}
+
+func (p *AgentEmitBatchArgs) writeField1(oprot thrift.TProtocol) (err error) {
+	if err := oprot.WriteFieldBegin("batch", thrift.STRUCT, 1); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T write field begin error 1:batch: ", p), err)
+	}
+	if err := p.Batch.Write(oprot); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T error writing struct: ", p.Batch), err)
+	}
+	if err := oprot.WriteFieldEnd(); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T write field end error 1:batch: ", p), err)
+	}
+	return err
+}
+
+func (p *AgentEmitBatchArgs) String() string {
+	if p == nil {
+		return "<nil>"
+	}
+	return fmt.Sprintf("AgentEmitBatchArgs(%+v)", *p)
+}

vendor/src/github.com/jaegertracing/jaeger-client-go/thrift-gen/agent/constants.go

@@ -0,0 +1,21 @@
+// Autogenerated by Thrift Compiler (0.9.3)
+// DO NOT EDIT UNLESS YOU ARE SURE THAT YOU KNOW WHAT YOU ARE DOING
+
+package agent
+
+import (
+	"bytes"
+	"fmt"
+	"github.com/apache/thrift/lib/go/thrift"
+	"github.com/uber/jaeger-client-go/thrift-gen/zipkincore"
+)
+
+// (needed to ensure safety because of naive import list construction.)
+var _ = thrift.ZERO
+var _ = fmt.Printf
+var _ = bytes.Equal
+
+var _ = zipkincore.GoUnusedProtection__
+
+func init() {
+}