mirror of
https://github.com/ziglang/zig.git
synced 2024-12-03 18:38:45 +00:00
675 lines
27 KiB
Zig
675 lines
27 KiB
Zig
const std = @import("../std.zig");
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const builtin = @import("builtin");
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const event = std.event;
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const assert = std.debug.assert;
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const testing = std.testing;
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const os = std.os;
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const mem = std.mem;
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const windows = os.windows;
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const Loop = event.Loop;
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const fd_t = os.fd_t;
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const File = std.fs.File;
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const Allocator = mem.Allocator;
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const global_event_loop = Loop.instance orelse
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@compileError("std.fs.Watch currently only works with event-based I/O");
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const WatchEventId = enum {
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CloseWrite,
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Delete,
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};
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fn eqlString(a: []const u16, b: []const u16) bool {
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if (a.len != b.len) return false;
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if (a.ptr == b.ptr) return true;
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return mem.compare(u16, a, b) == .Equal;
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}
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fn hashString(s: []const u16) u32 {
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return @truncate(u32, std.hash.Wyhash.hash(0, mem.sliceAsBytes(s)));
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}
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const WatchEventError = error{
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UserResourceLimitReached,
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SystemResources,
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AccessDenied,
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Unexpected, // TODO remove this possibility
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};
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pub fn Watch(comptime V: type) type {
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return struct {
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channel: *event.Channel(Event.Error!Event),
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os_data: OsData,
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allocator: *Allocator,
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const OsData = switch (builtin.os.tag) {
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// TODO https://github.com/ziglang/zig/issues/3778
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.macosx, .freebsd, .netbsd, .dragonfly => KqOsData,
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.linux => LinuxOsData,
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.windows => WindowsOsData,
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else => @compileError("Unsupported OS"),
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};
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const KqOsData = struct {
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file_table: FileTable,
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table_lock: event.Lock,
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const FileTable = std.StringHashMap(*Put);
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const Put = struct {
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putter_frame: @Frame(kqPutEvents),
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cancelled: bool = false,
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value: V,
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};
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};
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const WindowsOsData = struct {
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table_lock: event.Lock,
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dir_table: DirTable,
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all_putters: std.atomic.Queue(Put),
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ref_count: std.atomic.Int(usize),
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const Put = struct {
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putter: anyframe,
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cancelled: bool = false,
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};
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const DirTable = std.StringHashMap(*Dir);
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const FileTable = std.HashMap([]const u16, V, hashString, eqlString);
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const Dir = struct {
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putter_frame: @Frame(windowsDirReader),
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file_table: FileTable,
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table_lock: event.Lock,
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};
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};
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const LinuxOsData = struct {
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putter_frame: @Frame(linuxEventPutter),
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inotify_fd: i32,
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wd_table: WdTable,
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table_lock: event.Lock,
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cancelled: bool = false,
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const WdTable = std.AutoHashMap(i32, Dir);
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const FileTable = std.StringHashMap(V);
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const Dir = struct {
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dirname: []const u8,
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file_table: FileTable,
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};
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};
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const Self = @This();
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pub const Event = struct {
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id: Id,
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data: V,
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pub const Id = WatchEventId;
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pub const Error = WatchEventError;
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};
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pub fn init(allocator: *Allocator, event_buf_count: usize) !*Self {
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const channel = try allocator.create(event.Channel(Event.Error!Event));
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errdefer allocator.destroy(channel);
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var buf = try allocator.alloc(Event.Error!Event, event_buf_count);
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errdefer allocator.free(buf);
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channel.init(buf);
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errdefer channel.deinit();
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const self = try allocator.create(Self);
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errdefer allocator.destroy(self);
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switch (builtin.os.tag) {
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.linux => {
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const inotify_fd = try os.inotify_init1(os.linux.IN_NONBLOCK | os.linux.IN_CLOEXEC);
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errdefer os.close(inotify_fd);
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self.* = Self{
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.allocator = allocator,
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.channel = channel,
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.os_data = OsData{
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.putter_frame = undefined,
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.inotify_fd = inotify_fd,
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.wd_table = OsData.WdTable.init(allocator),
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.table_lock = event.Lock.init(),
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},
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};
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self.os_data.putter_frame = async self.linuxEventPutter();
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return self;
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},
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.windows => {
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self.* = Self{
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.allocator = allocator,
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.channel = channel,
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.os_data = OsData{
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.table_lock = event.Lock.init(),
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.dir_table = OsData.DirTable.init(allocator),
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.ref_count = std.atomic.Int(usize).init(1),
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.all_putters = std.atomic.Queue(anyframe).init(),
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},
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};
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return self;
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},
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.macosx, .freebsd, .netbsd, .dragonfly => {
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self.* = Self{
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.allocator = allocator,
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.channel = channel,
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.os_data = OsData{
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.table_lock = event.Lock.init(),
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.file_table = OsData.FileTable.init(allocator),
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},
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};
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return self;
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},
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else => @compileError("Unsupported OS"),
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}
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}
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/// All addFile calls and removeFile calls must have completed.
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pub fn deinit(self: *Self) void {
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switch (builtin.os.tag) {
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.macosx, .freebsd, .netbsd, .dragonfly => {
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// TODO we need to cancel the frames before destroying the lock
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self.os_data.table_lock.deinit();
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var it = self.os_data.file_table.iterator();
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while (it.next()) |entry| {
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entry.cancelled = true;
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await entry.value.putter;
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self.allocator.free(entry.key);
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self.allocator.free(entry.value);
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}
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self.channel.deinit();
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self.allocator.destroy(self.channel.buffer_nodes);
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self.allocator.destroy(self);
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},
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.linux => {
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self.os_data.cancelled = true;
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await self.os_data.putter_frame;
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self.allocator.destroy(self);
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},
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.windows => {
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while (self.os_data.all_putters.get()) |putter_node| {
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putter_node.cancelled = true;
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await putter_node.frame;
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}
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self.deref();
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},
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else => @compileError("Unsupported OS"),
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}
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}
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fn ref(self: *Self) void {
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_ = self.os_data.ref_count.incr();
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}
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fn deref(self: *Self) void {
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if (self.os_data.ref_count.decr() == 1) {
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self.os_data.table_lock.deinit();
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var it = self.os_data.dir_table.iterator();
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while (it.next()) |entry| {
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self.allocator.free(entry.key);
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self.allocator.destroy(entry.value);
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}
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self.os_data.dir_table.deinit();
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self.channel.deinit();
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self.allocator.destroy(self.channel.buffer_nodes);
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self.allocator.destroy(self);
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}
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}
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pub fn addFile(self: *Self, file_path: []const u8, value: V) !?V {
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switch (builtin.os.tag) {
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.macosx, .freebsd, .netbsd, .dragonfly => return addFileKEvent(self, file_path, value),
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.linux => return addFileLinux(self, file_path, value),
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.windows => return addFileWindows(self, file_path, value),
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else => @compileError("Unsupported OS"),
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}
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}
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fn addFileKEvent(self: *Self, file_path: []const u8, value: V) !?V {
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const resolved_path = try std.fs.path.resolve(self.allocator, [_][]const u8{file_path});
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var resolved_path_consumed = false;
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defer if (!resolved_path_consumed) self.allocator.free(resolved_path);
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var close_op = try CloseOperation.start(self.allocator);
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var close_op_consumed = false;
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defer if (!close_op_consumed) close_op.finish();
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const flags = if (comptime std.Target.current.isDarwin()) os.O_SYMLINK | os.O_EVTONLY else 0;
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const mode = 0;
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const fd = try openPosix(self.allocator, resolved_path, flags, mode);
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close_op.setHandle(fd);
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var put = try self.allocator.create(OsData.Put);
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errdefer self.allocator.destroy(put);
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put.* = OsData.Put{
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.value = value,
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.putter_frame = undefined,
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};
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put.putter_frame = async self.kqPutEvents(close_op, put);
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close_op_consumed = true;
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errdefer {
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put.cancelled = true;
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await put.putter_frame;
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}
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const result = blk: {
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const held = self.os_data.table_lock.acquire();
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defer held.release();
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const gop = try self.os_data.file_table.getOrPut(resolved_path);
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if (gop.found_existing) {
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const prev_value = gop.kv.value.value;
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await gop.kv.value.putter_frame;
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gop.kv.value = put;
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break :blk prev_value;
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} else {
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resolved_path_consumed = true;
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gop.kv.value = put;
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break :blk null;
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}
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};
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return result;
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}
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fn kqPutEvents(self: *Self, close_op: *CloseOperation, put: *OsData.Put) void {
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global_event_loop.beginOneEvent();
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defer {
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close_op.finish();
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global_event_loop.finishOneEvent();
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}
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while (!put.cancelled) {
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if (global_event_loop.bsdWaitKev(
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@intCast(usize, close_op.getHandle()),
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os.EVFILT_VNODE,
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os.NOTE_WRITE | os.NOTE_DELETE,
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)) |kev| {
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// TODO handle EV_ERROR
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if (kev.fflags & os.NOTE_DELETE != 0) {
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self.channel.put(Self.Event{
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.id = Event.Id.Delete,
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.data = put.value,
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});
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} else if (kev.fflags & os.NOTE_WRITE != 0) {
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self.channel.put(Self.Event{
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.id = Event.Id.CloseWrite,
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.data = put.value,
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});
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}
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} else |err| switch (err) {
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error.EventNotFound => unreachable,
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error.ProcessNotFound => unreachable,
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error.Overflow => unreachable,
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error.AccessDenied, error.SystemResources => |casted_err| {
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self.channel.put(casted_err);
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},
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}
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}
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}
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fn addFileLinux(self: *Self, file_path: []const u8, value: V) !?V {
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const dirname = std.fs.path.dirname(file_path) orelse ".";
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const dirname_with_null = try std.cstr.addNullByte(self.allocator, dirname);
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var dirname_with_null_consumed = false;
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defer if (!dirname_with_null_consumed) self.channel.free(dirname_with_null);
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const basename = std.fs.path.basename(file_path);
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const basename_with_null = try std.cstr.addNullByte(self.allocator, basename);
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var basename_with_null_consumed = false;
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defer if (!basename_with_null_consumed) self.allocator.free(basename_with_null);
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const wd = try os.inotify_add_watchZ(
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self.os_data.inotify_fd,
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dirname_with_null.ptr,
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os.linux.IN_CLOSE_WRITE | os.linux.IN_ONLYDIR | os.linux.IN_EXCL_UNLINK,
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);
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// wd is either a newly created watch or an existing one.
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const held = self.os_data.table_lock.acquire();
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defer held.release();
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const gop = try self.os_data.wd_table.getOrPut(wd);
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if (!gop.found_existing) {
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gop.kv.value = OsData.Dir{
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.dirname = dirname_with_null,
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.file_table = OsData.FileTable.init(self.allocator),
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};
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dirname_with_null_consumed = true;
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}
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const dir = &gop.kv.value;
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const file_table_gop = try dir.file_table.getOrPut(basename_with_null);
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if (file_table_gop.found_existing) {
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const prev_value = file_table_gop.kv.value;
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file_table_gop.kv.value = value;
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return prev_value;
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} else {
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file_table_gop.kv.value = value;
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basename_with_null_consumed = true;
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return null;
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}
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}
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fn addFileWindows(self: *Self, file_path: []const u8, value: V) !?V {
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// TODO we might need to convert dirname and basename to canonical file paths ("short"?)
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const dirname = try std.mem.dupe(self.allocator, u8, std.fs.path.dirname(file_path) orelse ".");
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var dirname_consumed = false;
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defer if (!dirname_consumed) self.allocator.free(dirname);
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const dirname_utf16le = try std.unicode.utf8ToUtf16LeWithNull(self.allocator, dirname);
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defer self.allocator.free(dirname_utf16le);
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// TODO https://github.com/ziglang/zig/issues/265
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const basename = std.fs.path.basename(file_path);
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const basename_utf16le_null = try std.unicode.utf8ToUtf16LeWithNull(self.allocator, basename);
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var basename_utf16le_null_consumed = false;
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defer if (!basename_utf16le_null_consumed) self.allocator.free(basename_utf16le_null);
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const basename_utf16le_no_null = basename_utf16le_null[0 .. basename_utf16le_null.len - 1];
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const dir_handle = try windows.CreateFileW(
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dirname_utf16le.ptr,
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windows.FILE_LIST_DIRECTORY,
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windows.FILE_SHARE_READ | windows.FILE_SHARE_DELETE | windows.FILE_SHARE_WRITE,
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null,
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windows.OPEN_EXISTING,
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windows.FILE_FLAG_BACKUP_SEMANTICS | windows.FILE_FLAG_OVERLAPPED,
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null,
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);
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var dir_handle_consumed = false;
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defer if (!dir_handle_consumed) windows.CloseHandle(dir_handle);
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const held = self.os_data.table_lock.acquire();
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defer held.release();
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const gop = try self.os_data.dir_table.getOrPut(dirname);
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if (gop.found_existing) {
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const dir = gop.kv.value;
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const held_dir_lock = dir.table_lock.acquire();
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defer held_dir_lock.release();
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const file_gop = try dir.file_table.getOrPut(basename_utf16le_no_null);
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if (file_gop.found_existing) {
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const prev_value = file_gop.kv.value;
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file_gop.kv.value = value;
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return prev_value;
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} else {
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file_gop.kv.value = value;
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basename_utf16le_null_consumed = true;
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return null;
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}
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} else {
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errdefer _ = self.os_data.dir_table.remove(dirname);
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const dir = try self.allocator.create(OsData.Dir);
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errdefer self.allocator.destroy(dir);
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dir.* = OsData.Dir{
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.file_table = OsData.FileTable.init(self.allocator),
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.table_lock = event.Lock.init(),
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.putter_frame = undefined,
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};
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gop.kv.value = dir;
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assert((try dir.file_table.put(basename_utf16le_no_null, value)) == null);
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basename_utf16le_null_consumed = true;
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dir.putter_frame = async self.windowsDirReader(dir_handle, dir);
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dir_handle_consumed = true;
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dirname_consumed = true;
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return null;
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}
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}
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fn windowsDirReader(self: *Self, dir_handle: windows.HANDLE, dir: *OsData.Dir) void {
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self.ref();
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defer self.deref();
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defer os.close(dir_handle);
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var putter_node = std.atomic.Queue(anyframe).Node{
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.data = .{ .putter = @frame() },
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.prev = null,
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.next = null,
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};
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self.os_data.all_putters.put(&putter_node);
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defer _ = self.os_data.all_putters.remove(&putter_node);
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var resume_node = Loop.ResumeNode.Basic{
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.base = Loop.ResumeNode{
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.id = Loop.ResumeNode.Id.Basic,
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.handle = @frame(),
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.overlapped = windows.OVERLAPPED{
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.Internal = 0,
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.InternalHigh = 0,
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.Offset = 0,
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.OffsetHigh = 0,
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.hEvent = null,
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},
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},
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};
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var event_buf: [4096]u8 align(@alignOf(windows.FILE_NOTIFY_INFORMATION)) = undefined;
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// TODO handle this error not in the channel but in the setup
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_ = windows.CreateIoCompletionPort(
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dir_handle,
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global_event_loop.os_data.io_port,
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undefined,
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undefined,
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) catch |err| {
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self.channel.put(err);
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return;
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};
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while (!putter_node.data.cancelled) {
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{
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// TODO only 1 beginOneEvent for the whole function
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global_event_loop.beginOneEvent();
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errdefer global_event_loop.finishOneEvent();
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errdefer {
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_ = windows.kernel32.CancelIoEx(dir_handle, &resume_node.base.overlapped);
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}
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suspend {
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_ = windows.kernel32.ReadDirectoryChangesW(
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dir_handle,
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&event_buf,
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@intCast(windows.DWORD, event_buf.len),
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windows.FALSE, // watch subtree
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windows.FILE_NOTIFY_CHANGE_FILE_NAME | windows.FILE_NOTIFY_CHANGE_DIR_NAME |
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windows.FILE_NOTIFY_CHANGE_ATTRIBUTES | windows.FILE_NOTIFY_CHANGE_SIZE |
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windows.FILE_NOTIFY_CHANGE_LAST_WRITE | windows.FILE_NOTIFY_CHANGE_LAST_ACCESS |
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windows.FILE_NOTIFY_CHANGE_CREATION | windows.FILE_NOTIFY_CHANGE_SECURITY,
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|
null, // number of bytes transferred (unused for async)
|
|
&resume_node.base.overlapped,
|
|
null, // completion routine - unused because we use IOCP
|
|
);
|
|
}
|
|
}
|
|
var bytes_transferred: windows.DWORD = undefined;
|
|
if (windows.kernel32.GetOverlappedResult(dir_handle, &resume_node.base.overlapped, &bytes_transferred, windows.FALSE) == 0) {
|
|
const err = switch (windows.kernel32.GetLastError()) {
|
|
else => |err| windows.unexpectedError(err),
|
|
};
|
|
self.channel.put(err);
|
|
} else {
|
|
// can't use @bytesToSlice because of the special variable length name field
|
|
var ptr = event_buf[0..].ptr;
|
|
const end_ptr = ptr + bytes_transferred;
|
|
var ev: *windows.FILE_NOTIFY_INFORMATION = undefined;
|
|
while (@ptrToInt(ptr) < @ptrToInt(end_ptr)) : (ptr += ev.NextEntryOffset) {
|
|
ev = @ptrCast(*windows.FILE_NOTIFY_INFORMATION, ptr);
|
|
const emit = switch (ev.Action) {
|
|
windows.FILE_ACTION_REMOVED => WatchEventId.Delete,
|
|
windows.FILE_ACTION_MODIFIED => WatchEventId.CloseWrite,
|
|
else => null,
|
|
};
|
|
if (emit) |id| {
|
|
const basename_utf16le = ([*]u16)(&ev.FileName)[0 .. ev.FileNameLength / 2];
|
|
const user_value = blk: {
|
|
const held = dir.table_lock.acquire();
|
|
defer held.release();
|
|
|
|
if (dir.file_table.get(basename_utf16le)) |entry| {
|
|
break :blk entry.value;
|
|
} else {
|
|
break :blk null;
|
|
}
|
|
};
|
|
if (user_value) |v| {
|
|
self.channel.put(Event{
|
|
.id = id,
|
|
.data = v,
|
|
});
|
|
}
|
|
}
|
|
if (ev.NextEntryOffset == 0) break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn removeFile(self: *Self, file_path: []const u8) ?V {
|
|
@panic("TODO");
|
|
}
|
|
|
|
fn linuxEventPutter(self: *Self) void {
|
|
global_event_loop.beginOneEvent();
|
|
|
|
defer {
|
|
self.os_data.table_lock.deinit();
|
|
var wd_it = self.os_data.wd_table.iterator();
|
|
while (wd_it.next()) |wd_entry| {
|
|
var file_it = wd_entry.value.file_table.iterator();
|
|
while (file_it.next()) |file_entry| {
|
|
self.allocator.free(file_entry.key);
|
|
}
|
|
self.allocator.free(wd_entry.value.dirname);
|
|
wd_entry.value.file_table.deinit();
|
|
}
|
|
self.os_data.wd_table.deinit();
|
|
global_event_loop.finishOneEvent();
|
|
os.close(self.os_data.inotify_fd);
|
|
self.channel.deinit();
|
|
self.allocator.free(self.channel.buffer_nodes);
|
|
}
|
|
|
|
var event_buf: [4096]u8 align(@alignOf(os.linux.inotify_event)) = undefined;
|
|
|
|
while (!self.os_data.cancelled) {
|
|
const rc = os.linux.read(self.os_data.inotify_fd, &event_buf, event_buf.len);
|
|
const errno = os.linux.getErrno(rc);
|
|
switch (errno) {
|
|
0 => {
|
|
// can't use @bytesToSlice because of the special variable length name field
|
|
var ptr = event_buf[0..].ptr;
|
|
const end_ptr = ptr + event_buf.len;
|
|
var ev: *os.linux.inotify_event = undefined;
|
|
while (@ptrToInt(ptr) < @ptrToInt(end_ptr)) {
|
|
ev = @ptrCast(*os.linux.inotify_event, ptr);
|
|
if (ev.mask & os.linux.IN_CLOSE_WRITE == os.linux.IN_CLOSE_WRITE) {
|
|
const basename_ptr = ptr + @sizeOf(os.linux.inotify_event);
|
|
// `ev.len` counts all bytes in `ev.name` including terminating null byte.
|
|
const basename_with_null = basename_ptr[0..ev.len];
|
|
const user_value = blk: {
|
|
const held = self.os_data.table_lock.acquire();
|
|
defer held.release();
|
|
|
|
const dir = &self.os_data.wd_table.get(ev.wd).?.value;
|
|
if (dir.file_table.get(basename_with_null)) |entry| {
|
|
break :blk entry.value;
|
|
} else {
|
|
break :blk null;
|
|
}
|
|
};
|
|
if (user_value) |v| {
|
|
self.channel.put(Event{
|
|
.id = WatchEventId.CloseWrite,
|
|
.data = v,
|
|
});
|
|
}
|
|
}
|
|
|
|
ptr = @alignCast(@alignOf(os.linux.inotify_event), ptr + @sizeOf(os.linux.inotify_event) + ev.len);
|
|
}
|
|
},
|
|
os.linux.EINTR => continue,
|
|
os.linux.EINVAL => unreachable,
|
|
os.linux.EFAULT => unreachable,
|
|
os.linux.EAGAIN => {
|
|
global_event_loop.linuxWaitFd(self.os_data.inotify_fd, os.linux.EPOLLET | os.linux.EPOLLIN | os.EPOLLONESHOT);
|
|
},
|
|
else => unreachable,
|
|
}
|
|
}
|
|
}
|
|
};
|
|
}
|
|
|
|
const test_tmp_dir = "std_event_fs_test";
|
|
|
|
test "write a file, watch it, write it again" {
|
|
// TODO re-enable this test
|
|
if (true) return error.SkipZigTest;
|
|
|
|
try fs.cwd().makePath(test_tmp_dir);
|
|
defer fs.cwd().deleteTree(test_tmp_dir) catch {};
|
|
|
|
const allocator = std.heap.page_allocator;
|
|
return testFsWatch(&allocator);
|
|
}
|
|
|
|
fn testFsWatch(allocator: *Allocator) !void {
|
|
const file_path = try std.fs.path.join(allocator, [_][]const u8{ test_tmp_dir, "file.txt" });
|
|
defer allocator.free(file_path);
|
|
|
|
const contents =
|
|
\\line 1
|
|
\\line 2
|
|
;
|
|
const line2_offset = 7;
|
|
|
|
// first just write then read the file
|
|
try writeFile(allocator, file_path, contents);
|
|
|
|
const read_contents = try readFile(allocator, file_path, 1024 * 1024);
|
|
testing.expectEqualSlices(u8, contents, read_contents);
|
|
|
|
// now watch the file
|
|
var watch = try Watch(void).init(allocator, 0);
|
|
defer watch.deinit();
|
|
|
|
testing.expect((try watch.addFile(file_path, {})) == null);
|
|
|
|
const ev = watch.channel.get();
|
|
var ev_consumed = false;
|
|
defer if (!ev_consumed) await ev;
|
|
|
|
// overwrite line 2
|
|
const fd = try await openReadWrite(file_path, File.default_mode);
|
|
{
|
|
defer os.close(fd);
|
|
|
|
try pwritev(allocator, fd, []const []const u8{"lorem ipsum"}, line2_offset);
|
|
}
|
|
|
|
ev_consumed = true;
|
|
switch ((try await ev).id) {
|
|
WatchEventId.CloseWrite => {},
|
|
WatchEventId.Delete => @panic("wrong event"),
|
|
}
|
|
const contents_updated = try readFile(allocator, file_path, 1024 * 1024);
|
|
testing.expectEqualSlices(u8,
|
|
\\line 1
|
|
\\lorem ipsum
|
|
, contents_updated);
|
|
|
|
// TODO test deleting the file and then re-adding it. we should get events for both
|
|
}
|