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Add dugong to support writing to disk/rotations

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This commit is contained in:
Kegan Dougal 2017-02-20 15:46:30 +00:00
parent f1bb59d24a
commit 0bd3af8115
5 changed files with 741 additions and 0 deletions
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6
vendor/manifest vendored
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"revision": "a6657b2386e9b8be76484c08711b02c7cf867ead",
"branch": "master"
},
{
"importpath": "github.com/matrix-org/dugong",
"repository": "https://github.com/matrix-org/dugong",
"revision": "193b8f88e381d12f2d53023fba25e43fc81dc5ac",
"branch": "master"
},
{
"importpath": "github.com/matrix-org/gomatrixserverlib",
"repository": "https://github.com/matrix-org/gomatrixserverlib",

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vendor/src/github.com/matrix-org/dugong/LICENSE vendored Normal file
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vendor/src/github.com/matrix-org/dugong/README.md vendored Normal file
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# dugong
Logging utilities for [logrus](https://github.com/Sirupsen/logrus).
To develop on this library, you need logrus on your GOPATH:
``go get github.com/Sirupsen/logrus``
You can then run its tests by running
``go test``

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vendor/src/github.com/matrix-org/dugong/fshook.go vendored Normal file
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package dugong
import (
"compress/gzip"
"fmt"
log "github.com/Sirupsen/logrus"
"io"
"os"
"path/filepath"
"sync/atomic"
"time"
)
// RotationScheduler determines when files should be rotated.
type RotationScheduler interface {
// ShouldRotate returns true if the file should be rotated. The suffix to apply
// to the filename is returned as the 2nd arg.
ShouldRotate() (bool, string)
// ShouldGZip returns true if the file should be gzipped when it is rotated.
ShouldGZip() bool
}
// DailyRotationSchedule rotates log files daily. Logs are only rotated
// when midnight passes *whilst the process is running*. E.g: if you run
// the process on Day 4 then stop it and start it on Day 7, no rotation will
// occur when the process starts.
type DailyRotationSchedule struct {
GZip bool
rotateAfter *time.Time
}
var currentTime = time.Now // exclusively for testing
func dayOffset(t time.Time, offsetDays int) time.Time {
// GoDoc:
// The month, day, hour, min, sec, and nsec values may be outside their
// usual ranges and will be normalized during the conversion.
// For example, October 32 converts to November 1.
return time.Date(
t.Year(), t.Month(), t.Day()+offsetDays, 0, 0, 0, 0, t.Location(),
)
}
func (rs *DailyRotationSchedule) ShouldRotate() (bool, string) {
now := currentTime()
if rs.rotateAfter == nil {
nextRotate := dayOffset(now, 1)
rs.rotateAfter = &nextRotate
return false, ""
}
if now.After(*rs.rotateAfter) {
// the suffix should be actually the date of the complete day being logged
actualDay := dayOffset(*rs.rotateAfter, -1)
suffix := "." + actualDay.Format("2006-01-02") // YYYY-MM-DD
nextRotate := dayOffset(now, 1)
rs.rotateAfter = &nextRotate
return true, suffix
}
return false, ""
}
func (rs *DailyRotationSchedule) ShouldGZip() bool {
return rs.GZip
}
// NewFSHook makes a logging hook that writes formatted
// log entries to info, warn and error log files. Each log file
// contains the messages with that severity or higher. If a formatter is
// not specified, they will be logged using a JSON formatter. If a
// RotationScheduler is set, the files will be cycled according to its rules.
func NewFSHook(infoPath, warnPath, errorPath string, formatter log.Formatter, rotSched RotationScheduler) log.Hook {
if formatter == nil {
formatter = &log.JSONFormatter{}
}
hook := &fsHook{
entries: make(chan log.Entry, 1024),
infoPath: infoPath,
warnPath: warnPath,
errorPath: errorPath,
formatter: formatter,
scheduler: rotSched,
}
go func() {
for entry := range hook.entries {
if err := hook.writeEntry(&entry); err != nil {
fmt.Fprintf(os.Stderr, "Error writing to logfile: %v\n", err)
}
atomic.AddInt32(&hook.queueSize, -1)
}
}()
return hook
}
type fsHook struct {
entries chan log.Entry
queueSize int32
infoPath string
warnPath string
errorPath string
formatter log.Formatter
scheduler RotationScheduler
}
func (hook *fsHook) Fire(entry *log.Entry) error {
atomic.AddInt32(&hook.queueSize, 1)
hook.entries <- *entry
return nil
}
func (hook *fsHook) writeEntry(entry *log.Entry) error {
msg, err := hook.formatter.Format(entry)
if err != nil {
return nil
}
if hook.scheduler != nil {
if should, suffix := hook.scheduler.ShouldRotate(); should {
if err := hook.rotate(suffix, hook.scheduler.ShouldGZip()); err != nil {
return err
}
}
}
if entry.Level <= log.ErrorLevel {
if err := logToFile(hook.errorPath, msg); err != nil {
return err
}
}
if entry.Level <= log.WarnLevel {
if err := logToFile(hook.warnPath, msg); err != nil {
return err
}
}
if entry.Level <= log.InfoLevel {
if err := logToFile(hook.infoPath, msg); err != nil {
return err
}
}
return nil
}
func (hook *fsHook) Levels() []log.Level {
return []log.Level{
log.PanicLevel,
log.FatalLevel,
log.ErrorLevel,
log.WarnLevel,
log.InfoLevel,
}
}
// rotate all the log files to the given suffix.
// If error path is "err.log" and suffix is "1" then move
// the contents to "err.log1".
// This requires no locking as the goroutine calling this is the same
// one which does the logging. Since we don't hold open a handle to the
// file when writing, a simple Rename is all that is required.
func (hook *fsHook) rotate(suffix string, gzip bool) error {
for _, fpath := range []string{hook.errorPath, hook.warnPath, hook.infoPath} {
logFilePath := fpath + suffix
if err := os.Rename(fpath, logFilePath); err != nil {
// e.g. because there were no errors in error.log for this day
fmt.Fprintf(os.Stderr, "Error rotating file %s: %v\n", fpath, err)
continue // don't try to gzip if we failed to rotate
}
if gzip {
if err := gzipFile(logFilePath); err != nil {
fmt.Fprintf(os.Stderr, "Failed to gzip file %s: %v\n", logFilePath, err)
}
}
}
return nil
}
func logToFile(path string, msg []byte) error {
fd, err := os.OpenFile(path, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0600)
if err != nil {
return err
}
defer fd.Close()
_, err = fd.Write(msg)
return err
}
func gzipFile(fpath string) error {
reader, err := os.Open(fpath)
if err != nil {
return err
}
filename := filepath.Base(fpath)
target := filepath.Join(filepath.Dir(fpath), filename+".gz")
writer, err := os.Create(target)
if err != nil {
return err
}
defer writer.Close()
archiver := gzip.NewWriter(writer)
archiver.Name = filename
defer archiver.Close()
_, err = io.Copy(archiver, reader)
return err
}

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package dugong
import (
"bufio"
"encoding/json"
log "github.com/Sirupsen/logrus"
"io/ioutil"
"os"
"path/filepath"
"runtime"
"sync"
"sync/atomic"
"testing"
"time"
)
const (
fieldName = "my_field"
fieldValue = "my_value"
)
func TestFSHookInfo(t *testing.T) {
logger, hook, wait, teardown := setupLogHook(t)
defer teardown()
logger.WithField(fieldName, fieldValue).Info("Info message")
wait()
checkLogFile(t, hook.infoPath, "info")
}
func TestFSHookWarn(t *testing.T) {
logger, hook, wait, teardown := setupLogHook(t)
defer teardown()
logger.WithField(fieldName, fieldValue).Warn("Warn message")
wait()
checkLogFile(t, hook.infoPath, "warning")
checkLogFile(t, hook.warnPath, "warning")
}
func TestFSHookError(t *testing.T) {
logger, hook, wait, teardown := setupLogHook(t)
defer teardown()
logger.WithField(fieldName, fieldValue).Error("Error message")
wait()
checkLogFile(t, hook.infoPath, "error")
checkLogFile(t, hook.warnPath, "error")
checkLogFile(t, hook.errorPath, "error")
}
func TestFsHookInterleaved(t *testing.T) {
logger, hook, wait, teardown := setupLogHook(t)
defer teardown()
logger.WithField("counter", 0).Info("message")
logger.WithField("counter", 1).Warn("message")
logger.WithField("counter", 2).Error("message")
logger.WithField("counter", 3).Warn("message")
logger.WithField("counter", 4).Info("message")
wait()
file, err := os.Open(hook.infoPath)
if err != nil {
t.Fatalf("Failed to open file: %v", err)
}
scanner := bufio.NewScanner(file)
count := 0
for scanner.Scan() {
data := make(map[string]interface{})
if err := json.Unmarshal([]byte(scanner.Text()), &data); err != nil {
t.Fatalf("Failed to parse JSON: %v", err)
}
dataCounter := int(data["counter"].(float64))
if count != dataCounter {
t.Fatalf("Counter: want %d got %d", count, dataCounter)
}
count++
}
if count != 5 {
t.Fatalf("Lines: want 5 got %d", count)
}
}
func TestFSHookMultiple(t *testing.T) {
logger, hook, wait, teardown := setupLogHook(t)
defer teardown()
for i := 0; i < 100; i++ {
logger.WithField("counter", i).Info("message")
}
wait()
file, err := os.Open(hook.infoPath)
if err != nil {
t.Fatalf("Failed to open file: %v", err)
}
scanner := bufio.NewScanner(file)
count := 0
for scanner.Scan() {
data := make(map[string]interface{})
if err := json.Unmarshal([]byte(scanner.Text()), &data); err != nil {
t.Fatalf("Failed to parse JSON: %v", err)
}
dataCounter := int(data["counter"].(float64))
if count != dataCounter {
t.Fatalf("Counter: want %d got %d", count, dataCounter)
}
count++
}
if count != 100 {
t.Fatalf("Lines: want 100 got %d", count)
}
}
func TestFSHookConcurrent(t *testing.T) {
logger, hook, wait, teardown := setupLogHook(t)
defer teardown()
var wg sync.WaitGroup
for i := 0; i < 100; i++ {
wg.Add(1)
go func(counter int) {
defer wg.Done()
logger.WithField("counter", counter).Info("message")
}(i)
}
wg.Wait()
wait()
file, err := os.Open(hook.infoPath)
if err != nil {
t.Fatalf("Failed to open file: %v", err)
}
scanner := bufio.NewScanner(file)
count := 0
for scanner.Scan() {
data := make(map[string]interface{})
if err := json.Unmarshal([]byte(scanner.Text()), &data); err != nil {
t.Fatalf("Failed to parse JSON: %v", err)
}
count++
}
if count != 100 {
t.Fatalf("Lines: want 100 got %d", count)
}
}
func TestDailySchedule(t *testing.T) {
loc, err := time.LoadLocation("UTC")
if err != nil {
t.Fatalf("Failed to load location UTC: %s", err)
}
logger, hook, wait, teardown := setupLogHook(t)
defer teardown()
hook.scheduler = &DailyRotationSchedule{}
// Time ticks from 23:50 to 00:10 in 1 minute increments. Log each tick as 'counter'.
minutesGoneBy := 0
currentTime = func() time.Time {
minutesGoneBy += 1
return time.Date(2016, 10, 26, 23, 50+minutesGoneBy, 00, 0, loc)
}
for i := 0; i < 20; i++ {
t := time.Date(2016, 10, 26, 23, 50+i, 00, 0, loc)
logger.WithField("counter", i).Info("BASE " + t.Format(time.ANSIC))
}
wait()
// info.log.2016-10-26 should have 0 -> 9
checkFileHasSequentialCounts(t, hook.infoPath+".2016-10-26", 0, 9)
// info.log should have 10 -> 19 inclusive
checkFileHasSequentialCounts(t, hook.infoPath, 10, 19)
}
func TestDailyScheduleMultipleRotations(t *testing.T) {
loc, err := time.LoadLocation("UTC")
if err != nil {
t.Fatalf("Failed to load location UTC: %s", err)
}
logger, hook, wait, teardown := setupLogHook(t)
defer teardown()
hook.scheduler = &DailyRotationSchedule{}
// Time ticks every 12 hours from 13:37 -> 01:37 -> 13:37 -> ...
hoursGoneBy := 0
currentTime = func() time.Time {
hoursGoneBy += 12
// Start from 10/29 01:37
return time.Date(2016, 10, 28, 13+hoursGoneBy, 37, 00, 0, loc)
}
// log 2 lines per file, to 4 files (so 8 log lines)
for i := 0; i < 8; i++ {
ts := time.Date(2016, 10, 28, 13+((i+1)*12), 37, 00, 0, loc)
logger.WithField("counter", i).Infof("The time is now %s", ts)
}
wait()
// info.log.2016-10-29 should have 0-1
checkFileHasSequentialCounts(t, hook.infoPath+".2016-10-29", 0, 1)
// info.log.2016-10-30 should have 2-3
checkFileHasSequentialCounts(t, hook.infoPath+".2016-10-30", 2, 3)
// info.log.2016-10-31 should have 4-5
checkFileHasSequentialCounts(t, hook.infoPath+".2016-10-31", 4, 5)
// info.log should have 6-7 (current day is 11/01)
checkFileHasSequentialCounts(t, hook.infoPath, 6, 7)
}
// checkFileHasSequentialCounts based on a JSON "counter" key being a monotonically
// incrementing integer. from and to are both inclusive.
func checkFileHasSequentialCounts(t *testing.T, filepath string, from, to int) {
t.Logf("checkFileHasSequentialCounts(%s,%d,%d)", filepath, from, to)
file, err := os.Open(filepath)
if err != nil {
t.Fatalf("Failed to open file: %v", err)
return
}
defer file.Close()
scanner := bufio.NewScanner(file)
count := from
for scanner.Scan() {
data := make(map[string]interface{})
if err := json.Unmarshal([]byte(scanner.Text()), &data); err != nil {
t.Fatalf("%s : Failed to parse JSON: %v", file.Name(), err)
}
dataCounter := int(data["counter"].(float64))
t.Logf("%s want %d got %d", file.Name(), count, dataCounter)
if count != dataCounter {
t.Fatalf("%s : Counter: want %d got %d", file.Name(), count, dataCounter)
}
count++
}
count-- // never hit the next value
if count != to {
t.Fatalf("%s EOF: Want count %d got %d", file.Name(), to, count)
}
}
func setupLogHook(t *testing.T) (logger *log.Logger, hook *fsHook, wait func(), teardown func()) {
dir, err := ioutil.TempDir("", "TestFSHook")
if err != nil {
t.Fatalf("Failed to make temporary directory: %v", err)
}
infoPath := filepath.Join(dir, "info.log")
warnPath := filepath.Join(dir, "warn.log")
errorPath := filepath.Join(dir, "error.log")
hook = NewFSHook(infoPath, warnPath, errorPath, nil, nil).(*fsHook)
logger = log.New()
logger.Hooks.Add(hook)
wait = func() {
for atomic.LoadInt32(&hook.queueSize) != 0 {
runtime.Gosched()
}
}
teardown = func() {
os.RemoveAll(dir)
}
return
}
func checkLogFile(t *testing.T, path, expectedLevel string) {
contents, err := ioutil.ReadFile(path)
if err != nil {
t.Fatalf("Failed to read file: %v", err)
}
data := make(map[string]interface{})
if err := json.Unmarshal(contents, &data); err != nil {
t.Fatalf("Failed to parse JSON: %v", err)
}
if data["level"] != expectedLevel {
t.Fatalf("level: want %q got %q", expectedLevel, data["level"])
}
if data[fieldName] != fieldValue {
t.Fatalf("%s: want %q got %q", fieldName, fieldValue, data[fieldName])
}
}