-
-
Notifications
You must be signed in to change notification settings - Fork 6.5k
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Fix fs watcher EMFILE error. (#8258)
* Fix fs watcher EMFILE error. * Improve types. * Resolve eslint error. * Resolve eslint error. * Update CHANGELOG.md * Eslint on CI. * Update CHANGELOG.md * Copyright header.
- Loading branch information
1 parent
228b7d1
commit f88ae4b
Showing
5 changed files
with
215 additions
and
2 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,187 @@ | ||
/** | ||
* Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved. | ||
* | ||
* This source code is licensed under the MIT license found in the | ||
* LICENSE file in the root directory of this source tree. | ||
* | ||
*/ | ||
|
||
import fs from 'fs'; | ||
import path from 'path'; | ||
import {EventEmitter} from 'events'; | ||
import anymatch from 'anymatch'; | ||
import micromatch from 'micromatch'; | ||
// eslint-disable-next-line | ||
import {Watcher} from 'fsevents'; | ||
// @ts-ignore no types | ||
import walker from 'walker'; | ||
|
||
let fsevents: (path: string) => Watcher; | ||
try { | ||
fsevents = require('fsevents'); | ||
} catch (e) { | ||
// Optional dependency, only supported on Darwin. | ||
} | ||
|
||
const CHANGE_EVENT = 'change'; | ||
const DELETE_EVENT = 'delete'; | ||
const ADD_EVENT = 'add'; | ||
const ALL_EVENT = 'all'; | ||
|
||
type FsEventsWatcherEvent = | ||
| typeof CHANGE_EVENT | ||
| typeof DELETE_EVENT | ||
| typeof ADD_EVENT | ||
| typeof ALL_EVENT; | ||
|
||
/** | ||
* Export `FSEventsWatcher` class. | ||
* Watches `dir`. | ||
*/ | ||
class FSEventsWatcher extends EventEmitter { | ||
public readonly root: string; | ||
public readonly ignored?: anymatch.Matcher; | ||
public readonly glob: Array<string>; | ||
public readonly dot: boolean; | ||
public readonly hasIgnore: boolean; | ||
public readonly doIgnore: (path: string) => boolean; | ||
public readonly watcher: Watcher; | ||
private _tracked: Set<string>; | ||
|
||
static isSupported() { | ||
return fsevents !== undefined; | ||
} | ||
|
||
private static normalizeProxy( | ||
callback: (normalizedPath: string, stats: fs.Stats) => void, | ||
) { | ||
return (filepath: string, stats: fs.Stats) => | ||
callback(path.normalize(filepath), stats); | ||
} | ||
|
||
private static recReaddir( | ||
dir: string, | ||
dirCallback: (normalizedPath: string, stats: fs.Stats) => void, | ||
fileCallback: (normalizedPath: string, stats: fs.Stats) => void, | ||
endCallback: Function, | ||
errorCallback: Function, | ||
ignored?: anymatch.Matcher, | ||
) { | ||
walker(dir) | ||
.filterDir( | ||
(currentDir: string) => !ignored || !anymatch(ignored, currentDir), | ||
) | ||
.on('dir', FSEventsWatcher.normalizeProxy(dirCallback)) | ||
.on('file', FSEventsWatcher.normalizeProxy(fileCallback)) | ||
.on('error', errorCallback) | ||
.on('end', () => { | ||
endCallback(); | ||
}); | ||
} | ||
|
||
constructor( | ||
dir: string, | ||
opts: { | ||
root: string; | ||
ignored?: anymatch.Matcher; | ||
glob: string | Array<string>; | ||
dot: boolean; | ||
}, | ||
) { | ||
if (!fsevents) { | ||
throw new Error( | ||
'`fsevents` unavailable (this watcher can only be used on Darwin)', | ||
); | ||
} | ||
|
||
super(); | ||
|
||
this.dot = opts.dot || false; | ||
this.ignored = opts.ignored; | ||
this.glob = Array.isArray(opts.glob) ? opts.glob : [opts.glob]; | ||
|
||
this.hasIgnore = | ||
Boolean(opts.ignored) && !(Array.isArray(opts) && opts.length > 0); | ||
this.doIgnore = opts.ignored ? anymatch(opts.ignored) : () => false; | ||
|
||
this.root = path.resolve(dir); | ||
this.watcher = fsevents(this.root); | ||
|
||
this.watcher.start().on('change', this.handleEvent.bind(this)); | ||
this._tracked = new Set(); | ||
FSEventsWatcher.recReaddir( | ||
this.root, | ||
(filepath: string) => { | ||
this._tracked.add(filepath); | ||
}, | ||
(filepath: string) => { | ||
this._tracked.add(filepath); | ||
}, | ||
this.emit.bind(this, 'ready'), | ||
this.emit.bind(this, 'error'), | ||
this.ignored, | ||
); | ||
} | ||
|
||
/** | ||
* End watching. | ||
*/ | ||
close(callback?: () => void) { | ||
this.watcher.stop(); | ||
this.removeAllListeners(); | ||
if (typeof callback === 'function') { | ||
process.nextTick(callback.bind(null, null, true)); | ||
} | ||
} | ||
|
||
private isFileIncluded(relativePath: string) { | ||
if (this.doIgnore(relativePath)) { | ||
return false; | ||
} | ||
return this.glob.length | ||
? micromatch.some(relativePath, this.glob, {dot: this.dot}) | ||
: this.dot || micromatch.some(relativePath, '**/*'); | ||
} | ||
|
||
private handleEvent(filepath: string) { | ||
const relativePath = path.relative(this.root, filepath); | ||
if (!this.isFileIncluded(relativePath)) { | ||
return; | ||
} | ||
|
||
fs.lstat(filepath, (error, stat) => { | ||
if (error && error.code !== 'ENOENT') { | ||
this.emit('error', error); | ||
return; | ||
} | ||
|
||
if (error) { | ||
// Ignore files that aren't tracked and don't exist. | ||
if (!this._tracked.has(filepath)) { | ||
return; | ||
} | ||
|
||
this._emit(DELETE_EVENT, relativePath); | ||
this._tracked.delete(filepath); | ||
return; | ||
} | ||
|
||
if (this._tracked.has(filepath)) { | ||
this._emit(CHANGE_EVENT, relativePath, stat); | ||
} else { | ||
this._tracked.add(filepath); | ||
this._emit(ADD_EVENT, relativePath, stat); | ||
} | ||
}); | ||
} | ||
|
||
/** | ||
* Emit events. | ||
*/ | ||
private _emit(type: FsEventsWatcherEvent, file: string, stat?: fs.Stats) { | ||
this.emit(type, file, this.root, stat); | ||
this.emit(ALL_EVENT, type, file, this.root, stat); | ||
} | ||
} | ||
|
||
export = FSEventsWatcher; |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters