787 lines
20 KiB
JavaScript
787 lines
20 KiB
JavaScript
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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"use strict";
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const EventEmitter = require("events").EventEmitter;
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const fs = require("graceful-fs");
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const path = require("path");
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const watchEventSource = require("./watchEventSource");
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const EXISTANCE_ONLY_TIME_ENTRY = Object.freeze({});
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let FS_ACCURACY = 2000;
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const IS_OSX = require("os").platform() === "darwin";
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const WATCHPACK_POLLING = process.env.WATCHPACK_POLLING;
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const FORCE_POLLING =
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`${+WATCHPACK_POLLING}` === WATCHPACK_POLLING
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? +WATCHPACK_POLLING
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: !!WATCHPACK_POLLING && WATCHPACK_POLLING !== "false";
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function withoutCase(str) {
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return str.toLowerCase();
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}
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function needCalls(times, callback) {
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return function() {
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if (--times === 0) {
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return callback();
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}
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};
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}
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class Watcher extends EventEmitter {
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constructor(directoryWatcher, filePath, startTime) {
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super();
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this.directoryWatcher = directoryWatcher;
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this.path = filePath;
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this.startTime = startTime && +startTime;
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}
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checkStartTime(mtime, initial) {
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const startTime = this.startTime;
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if (typeof startTime !== "number") return !initial;
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return startTime <= mtime;
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}
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close() {
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this.emit("closed");
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}
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}
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class DirectoryWatcher extends EventEmitter {
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constructor(watcherManager, directoryPath, options) {
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super();
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if (FORCE_POLLING) {
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options.poll = FORCE_POLLING;
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}
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this.watcherManager = watcherManager;
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this.options = options;
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this.path = directoryPath;
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// safeTime is the point in time after which reading is safe to be unchanged
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// timestamp is a value that should be compared with another timestamp (mtime)
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/** @type {Map<string, { safeTime: number, timestamp: number }} */
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this.files = new Map();
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/** @type {Map<string, number>} */
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this.filesWithoutCase = new Map();
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this.directories = new Map();
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this.lastWatchEvent = 0;
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this.initialScan = true;
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this.ignored = options.ignored || (() => false);
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this.nestedWatching = false;
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this.polledWatching =
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typeof options.poll === "number"
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? options.poll
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: options.poll
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? 5007
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: false;
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this.timeout = undefined;
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this.initialScanRemoved = new Set();
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this.initialScanFinished = undefined;
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/** @type {Map<string, Set<Watcher>>} */
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this.watchers = new Map();
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this.parentWatcher = null;
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this.refs = 0;
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this._activeEvents = new Map();
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this.closed = false;
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this.scanning = false;
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this.scanAgain = false;
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this.scanAgainInitial = false;
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this.createWatcher();
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this.doScan(true);
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}
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createWatcher() {
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try {
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if (this.polledWatching) {
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this.watcher = {
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close: () => {
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if (this.timeout) {
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clearTimeout(this.timeout);
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this.timeout = undefined;
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}
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}
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};
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} else {
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if (IS_OSX) {
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this.watchInParentDirectory();
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}
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this.watcher = watchEventSource.watch(this.path);
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this.watcher.on("change", this.onWatchEvent.bind(this));
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this.watcher.on("error", this.onWatcherError.bind(this));
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}
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} catch (err) {
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this.onWatcherError(err);
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}
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}
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forEachWatcher(path, fn) {
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const watchers = this.watchers.get(withoutCase(path));
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if (watchers !== undefined) {
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for (const w of watchers) {
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fn(w);
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}
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}
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}
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setMissing(itemPath, initial, type) {
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if (this.initialScan) {
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this.initialScanRemoved.add(itemPath);
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}
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const oldDirectory = this.directories.get(itemPath);
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if (oldDirectory) {
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if (this.nestedWatching) oldDirectory.close();
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this.directories.delete(itemPath);
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this.forEachWatcher(itemPath, w => w.emit("remove", type));
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if (!initial) {
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this.forEachWatcher(this.path, w =>
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w.emit("change", itemPath, null, type, initial)
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);
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}
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}
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const oldFile = this.files.get(itemPath);
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if (oldFile) {
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this.files.delete(itemPath);
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const key = withoutCase(itemPath);
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const count = this.filesWithoutCase.get(key) - 1;
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if (count <= 0) {
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this.filesWithoutCase.delete(key);
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this.forEachWatcher(itemPath, w => w.emit("remove", type));
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} else {
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this.filesWithoutCase.set(key, count);
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}
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if (!initial) {
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this.forEachWatcher(this.path, w =>
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w.emit("change", itemPath, null, type, initial)
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);
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}
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}
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}
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setFileTime(filePath, mtime, initial, ignoreWhenEqual, type) {
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const now = Date.now();
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if (this.ignored(filePath)) return;
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const old = this.files.get(filePath);
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let safeTime, accuracy;
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if (initial) {
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safeTime = Math.min(now, mtime) + FS_ACCURACY;
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accuracy = FS_ACCURACY;
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} else {
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safeTime = now;
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accuracy = 0;
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if (old && old.timestamp === mtime && mtime + FS_ACCURACY < now) {
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// We are sure that mtime is untouched
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// This can be caused by some file attribute change
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// e. g. when access time has been changed
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// but the file content is untouched
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return;
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}
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}
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if (ignoreWhenEqual && old && old.timestamp === mtime) return;
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this.files.set(filePath, {
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safeTime,
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accuracy,
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timestamp: mtime
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});
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if (!old) {
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const key = withoutCase(filePath);
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const count = this.filesWithoutCase.get(key);
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this.filesWithoutCase.set(key, (count || 0) + 1);
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if (count !== undefined) {
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// There is already a file with case-insensitive-equal name
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// On a case-insensitive filesystem we may miss the renaming
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// when only casing is changed.
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// To be sure that our information is correct
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// we trigger a rescan here
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this.doScan(false);
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}
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this.forEachWatcher(filePath, w => {
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if (!initial || w.checkStartTime(safeTime, initial)) {
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w.emit("change", mtime, type);
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}
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});
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} else if (!initial) {
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this.forEachWatcher(filePath, w => w.emit("change", mtime, type));
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}
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this.forEachWatcher(this.path, w => {
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if (!initial || w.checkStartTime(safeTime, initial)) {
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w.emit("change", filePath, safeTime, type, initial);
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}
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});
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}
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setDirectory(directoryPath, birthtime, initial, type) {
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if (this.ignored(directoryPath)) return;
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if (directoryPath === this.path) {
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if (!initial) {
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this.forEachWatcher(this.path, w =>
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w.emit("change", directoryPath, birthtime, type, initial)
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);
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}
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} else {
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const old = this.directories.get(directoryPath);
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if (!old) {
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const now = Date.now();
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if (this.nestedWatching) {
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this.createNestedWatcher(directoryPath);
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} else {
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this.directories.set(directoryPath, true);
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}
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let safeTime;
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if (initial) {
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safeTime = Math.min(now, birthtime) + FS_ACCURACY;
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} else {
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safeTime = now;
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}
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this.forEachWatcher(directoryPath, w => {
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if (!initial || w.checkStartTime(safeTime, false)) {
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w.emit("change", birthtime, type);
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}
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});
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this.forEachWatcher(this.path, w => {
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if (!initial || w.checkStartTime(safeTime, initial)) {
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w.emit("change", directoryPath, safeTime, type, initial);
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}
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});
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}
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}
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}
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createNestedWatcher(directoryPath) {
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const watcher = this.watcherManager.watchDirectory(directoryPath, 1);
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watcher.on("change", (filePath, mtime, type, initial) => {
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this.forEachWatcher(this.path, w => {
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if (!initial || w.checkStartTime(mtime, initial)) {
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w.emit("change", filePath, mtime, type, initial);
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}
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});
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});
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this.directories.set(directoryPath, watcher);
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}
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setNestedWatching(flag) {
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if (this.nestedWatching !== !!flag) {
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this.nestedWatching = !!flag;
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if (this.nestedWatching) {
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for (const directory of this.directories.keys()) {
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this.createNestedWatcher(directory);
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}
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} else {
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for (const [directory, watcher] of this.directories) {
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watcher.close();
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this.directories.set(directory, true);
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}
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}
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}
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}
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watch(filePath, startTime) {
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const key = withoutCase(filePath);
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let watchers = this.watchers.get(key);
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if (watchers === undefined) {
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watchers = new Set();
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this.watchers.set(key, watchers);
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}
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this.refs++;
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const watcher = new Watcher(this, filePath, startTime);
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watcher.on("closed", () => {
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if (--this.refs <= 0) {
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this.close();
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return;
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}
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watchers.delete(watcher);
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if (watchers.size === 0) {
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this.watchers.delete(key);
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if (this.path === filePath) this.setNestedWatching(false);
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}
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});
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watchers.add(watcher);
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let safeTime;
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if (filePath === this.path) {
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this.setNestedWatching(true);
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safeTime = this.lastWatchEvent;
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for (const entry of this.files.values()) {
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fixupEntryAccuracy(entry);
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safeTime = Math.max(safeTime, entry.safeTime);
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}
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} else {
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const entry = this.files.get(filePath);
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if (entry) {
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fixupEntryAccuracy(entry);
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safeTime = entry.safeTime;
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} else {
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safeTime = 0;
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}
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}
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if (safeTime) {
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if (safeTime >= startTime) {
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process.nextTick(() => {
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if (this.closed) return;
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if (filePath === this.path) {
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watcher.emit(
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"change",
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filePath,
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safeTime,
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"watch (outdated on attach)",
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true
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);
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} else {
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watcher.emit(
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"change",
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safeTime,
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"watch (outdated on attach)",
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true
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);
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}
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});
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}
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} else if (this.initialScan) {
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if (this.initialScanRemoved.has(filePath)) {
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process.nextTick(() => {
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if (this.closed) return;
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watcher.emit("remove");
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});
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}
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} else if (
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!this.directories.has(filePath) &&
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watcher.checkStartTime(this.initialScanFinished, false)
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) {
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process.nextTick(() => {
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if (this.closed) return;
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watcher.emit("initial-missing", "watch (missing on attach)");
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});
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}
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return watcher;
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}
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onWatchEvent(eventType, filename) {
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if (this.closed) return;
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if (!filename) {
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// In some cases no filename is provided
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// This seem to happen on windows
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// So some event happened but we don't know which file is affected
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// We have to do a full scan of the directory
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this.doScan(false);
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return;
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}
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const filePath = path.join(this.path, filename);
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if (this.ignored(filePath)) return;
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if (this._activeEvents.get(filename) === undefined) {
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this._activeEvents.set(filename, false);
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const checkStats = () => {
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if (this.closed) return;
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this._activeEvents.set(filename, false);
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fs.lstat(filePath, (err, stats) => {
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if (this.closed) return;
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if (this._activeEvents.get(filename) === true) {
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process.nextTick(checkStats);
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return;
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}
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this._activeEvents.delete(filename);
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// ENOENT happens when the file/directory doesn't exist
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// EPERM happens when the containing directory doesn't exist
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if (err) {
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if (
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err.code !== "ENOENT" &&
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err.code !== "EPERM" &&
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err.code !== "EBUSY"
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) {
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this.onStatsError(err);
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} else {
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if (filename === path.basename(this.path)) {
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// This may indicate that the directory itself was removed
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if (!fs.existsSync(this.path)) {
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this.onDirectoryRemoved("stat failed");
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}
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}
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}
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}
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this.lastWatchEvent = Date.now();
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if (!stats) {
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this.setMissing(filePath, false, eventType);
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} else if (stats.isDirectory()) {
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this.setDirectory(
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filePath,
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+stats.birthtime || 1,
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false,
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eventType
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);
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} else if (stats.isFile() || stats.isSymbolicLink()) {
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if (stats.mtime) {
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ensureFsAccuracy(stats.mtime);
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}
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this.setFileTime(
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filePath,
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+stats.mtime || +stats.ctime || 1,
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false,
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false,
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eventType
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);
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}
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});
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};
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process.nextTick(checkStats);
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} else {
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this._activeEvents.set(filename, true);
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}
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}
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onWatcherError(err) {
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if (this.closed) return;
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if (err) {
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if (err.code !== "EPERM" && err.code !== "ENOENT") {
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console.error("Watchpack Error (watcher): " + err);
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}
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this.onDirectoryRemoved("watch error");
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}
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}
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onStatsError(err) {
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if (err) {
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console.error("Watchpack Error (stats): " + err);
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}
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}
|
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onScanError(err) {
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if (err) {
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console.error("Watchpack Error (initial scan): " + err);
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}
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this.onScanFinished();
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}
|
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onScanFinished() {
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if (this.polledWatching) {
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this.timeout = setTimeout(() => {
|
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if (this.closed) return;
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this.doScan(false);
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}, this.polledWatching);
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}
|
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}
|
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onDirectoryRemoved(reason) {
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if (this.watcher) {
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this.watcher.close();
|
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this.watcher = null;
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}
|
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this.watchInParentDirectory();
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const type = `directory-removed (${reason})`;
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for (const directory of this.directories.keys()) {
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this.setMissing(directory, null, type);
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}
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for (const file of this.files.keys()) {
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this.setMissing(file, null, type);
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}
|
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}
|
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|
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watchInParentDirectory() {
|
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if (!this.parentWatcher) {
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const parentDir = path.dirname(this.path);
|
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// avoid watching in the root directory
|
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// removing directories in the root directory is not supported
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if (path.dirname(parentDir) === parentDir) return;
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|
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this.parentWatcher = this.watcherManager.watchFile(this.path, 1);
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this.parentWatcher.on("change", (mtime, type) => {
|
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if (this.closed) return;
|
|
|
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// On non-osx platforms we don't need this watcher to detect
|
|
// directory removal, as an EPERM error indicates that
|
|
if ((!IS_OSX || this.polledWatching) && this.parentWatcher) {
|
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this.parentWatcher.close();
|
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this.parentWatcher = null;
|
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}
|
|
// Try to create the watcher when parent directory is found
|
|
if (!this.watcher) {
|
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this.createWatcher();
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this.doScan(false);
|
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|
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// directory was created so we emit an event
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this.forEachWatcher(this.path, w =>
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w.emit("change", this.path, mtime, type, false)
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);
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}
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});
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this.parentWatcher.on("remove", () => {
|
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this.onDirectoryRemoved("parent directory removed");
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});
|
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}
|
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}
|
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|
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doScan(initial) {
|
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if (this.scanning) {
|
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if (this.scanAgain) {
|
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if (!initial) this.scanAgainInitial = false;
|
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} else {
|
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this.scanAgain = true;
|
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this.scanAgainInitial = initial;
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}
|
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return;
|
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}
|
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this.scanning = true;
|
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if (this.timeout) {
|
|
clearTimeout(this.timeout);
|
|
this.timeout = undefined;
|
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}
|
|
process.nextTick(() => {
|
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if (this.closed) return;
|
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fs.readdir(this.path, (err, items) => {
|
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if (this.closed) return;
|
|
if (err) {
|
|
if (err.code === "ENOENT" || err.code === "EPERM") {
|
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this.onDirectoryRemoved("scan readdir failed");
|
|
} else {
|
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this.onScanError(err);
|
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}
|
|
this.initialScan = false;
|
|
this.initialScanFinished = Date.now();
|
|
if (initial) {
|
|
for (const watchers of this.watchers.values()) {
|
|
for (const watcher of watchers) {
|
|
if (watcher.checkStartTime(this.initialScanFinished, false)) {
|
|
watcher.emit(
|
|
"initial-missing",
|
|
"scan (parent directory missing in initial scan)"
|
|
);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if (this.scanAgain) {
|
|
this.scanAgain = false;
|
|
this.doScan(this.scanAgainInitial);
|
|
} else {
|
|
this.scanning = false;
|
|
}
|
|
return;
|
|
}
|
|
const itemPaths = new Set(
|
|
items.map(item => path.join(this.path, item.normalize("NFC")))
|
|
);
|
|
for (const file of this.files.keys()) {
|
|
if (!itemPaths.has(file)) {
|
|
this.setMissing(file, initial, "scan (missing)");
|
|
}
|
|
}
|
|
for (const directory of this.directories.keys()) {
|
|
if (!itemPaths.has(directory)) {
|
|
this.setMissing(directory, initial, "scan (missing)");
|
|
}
|
|
}
|
|
if (this.scanAgain) {
|
|
// Early repeat of scan
|
|
this.scanAgain = false;
|
|
this.doScan(initial);
|
|
return;
|
|
}
|
|
const itemFinished = needCalls(itemPaths.size + 1, () => {
|
|
if (this.closed) return;
|
|
this.initialScan = false;
|
|
this.initialScanRemoved = null;
|
|
this.initialScanFinished = Date.now();
|
|
if (initial) {
|
|
const missingWatchers = new Map(this.watchers);
|
|
missingWatchers.delete(withoutCase(this.path));
|
|
for (const item of itemPaths) {
|
|
missingWatchers.delete(withoutCase(item));
|
|
}
|
|
for (const watchers of missingWatchers.values()) {
|
|
for (const watcher of watchers) {
|
|
if (watcher.checkStartTime(this.initialScanFinished, false)) {
|
|
watcher.emit(
|
|
"initial-missing",
|
|
"scan (missing in initial scan)"
|
|
);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if (this.scanAgain) {
|
|
this.scanAgain = false;
|
|
this.doScan(this.scanAgainInitial);
|
|
} else {
|
|
this.scanning = false;
|
|
this.onScanFinished();
|
|
}
|
|
});
|
|
for (const itemPath of itemPaths) {
|
|
fs.lstat(itemPath, (err2, stats) => {
|
|
if (this.closed) return;
|
|
if (err2) {
|
|
if (
|
|
err2.code === "ENOENT" ||
|
|
err2.code === "EPERM" ||
|
|
err2.code === "EACCES" ||
|
|
err2.code === "EBUSY"
|
|
) {
|
|
this.setMissing(itemPath, initial, "scan (" + err2.code + ")");
|
|
} else {
|
|
this.onScanError(err2);
|
|
}
|
|
itemFinished();
|
|
return;
|
|
}
|
|
if (stats.isFile() || stats.isSymbolicLink()) {
|
|
if (stats.mtime) {
|
|
ensureFsAccuracy(stats.mtime);
|
|
}
|
|
this.setFileTime(
|
|
itemPath,
|
|
+stats.mtime || +stats.ctime || 1,
|
|
initial,
|
|
true,
|
|
"scan (file)"
|
|
);
|
|
} else if (stats.isDirectory()) {
|
|
if (!initial || !this.directories.has(itemPath))
|
|
this.setDirectory(
|
|
itemPath,
|
|
+stats.birthtime || 1,
|
|
initial,
|
|
"scan (dir)"
|
|
);
|
|
}
|
|
itemFinished();
|
|
});
|
|
}
|
|
itemFinished();
|
|
});
|
|
});
|
|
}
|
|
|
|
getTimes() {
|
|
const obj = Object.create(null);
|
|
let safeTime = this.lastWatchEvent;
|
|
for (const [file, entry] of this.files) {
|
|
fixupEntryAccuracy(entry);
|
|
safeTime = Math.max(safeTime, entry.safeTime);
|
|
obj[file] = Math.max(entry.safeTime, entry.timestamp);
|
|
}
|
|
if (this.nestedWatching) {
|
|
for (const w of this.directories.values()) {
|
|
const times = w.directoryWatcher.getTimes();
|
|
for (const file of Object.keys(times)) {
|
|
const time = times[file];
|
|
safeTime = Math.max(safeTime, time);
|
|
obj[file] = time;
|
|
}
|
|
}
|
|
obj[this.path] = safeTime;
|
|
}
|
|
if (!this.initialScan) {
|
|
for (const watchers of this.watchers.values()) {
|
|
for (const watcher of watchers) {
|
|
const path = watcher.path;
|
|
if (!Object.prototype.hasOwnProperty.call(obj, path)) {
|
|
obj[path] = null;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return obj;
|
|
}
|
|
|
|
collectTimeInfoEntries(fileTimestamps, directoryTimestamps) {
|
|
let safeTime = this.lastWatchEvent;
|
|
for (const [file, entry] of this.files) {
|
|
fixupEntryAccuracy(entry);
|
|
safeTime = Math.max(safeTime, entry.safeTime);
|
|
fileTimestamps.set(file, entry);
|
|
}
|
|
if (this.nestedWatching) {
|
|
for (const w of this.directories.values()) {
|
|
safeTime = Math.max(
|
|
safeTime,
|
|
w.directoryWatcher.collectTimeInfoEntries(
|
|
fileTimestamps,
|
|
directoryTimestamps
|
|
)
|
|
);
|
|
}
|
|
fileTimestamps.set(this.path, EXISTANCE_ONLY_TIME_ENTRY);
|
|
directoryTimestamps.set(this.path, {
|
|
safeTime
|
|
});
|
|
} else {
|
|
for (const dir of this.directories.keys()) {
|
|
// No additional info about this directory
|
|
// but maybe another DirectoryWatcher has info
|
|
fileTimestamps.set(dir, EXISTANCE_ONLY_TIME_ENTRY);
|
|
if (!directoryTimestamps.has(dir))
|
|
directoryTimestamps.set(dir, EXISTANCE_ONLY_TIME_ENTRY);
|
|
}
|
|
fileTimestamps.set(this.path, EXISTANCE_ONLY_TIME_ENTRY);
|
|
directoryTimestamps.set(this.path, EXISTANCE_ONLY_TIME_ENTRY);
|
|
}
|
|
if (!this.initialScan) {
|
|
for (const watchers of this.watchers.values()) {
|
|
for (const watcher of watchers) {
|
|
const path = watcher.path;
|
|
if (!fileTimestamps.has(path)) {
|
|
fileTimestamps.set(path, null);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return safeTime;
|
|
}
|
|
|
|
close() {
|
|
this.closed = true;
|
|
this.initialScan = false;
|
|
if (this.watcher) {
|
|
this.watcher.close();
|
|
this.watcher = null;
|
|
}
|
|
if (this.nestedWatching) {
|
|
for (const w of this.directories.values()) {
|
|
w.close();
|
|
}
|
|
this.directories.clear();
|
|
}
|
|
if (this.parentWatcher) {
|
|
this.parentWatcher.close();
|
|
this.parentWatcher = null;
|
|
}
|
|
this.emit("closed");
|
|
}
|
|
}
|
|
|
|
module.exports = DirectoryWatcher;
|
|
module.exports.EXISTANCE_ONLY_TIME_ENTRY = EXISTANCE_ONLY_TIME_ENTRY;
|
|
|
|
function fixupEntryAccuracy(entry) {
|
|
if (entry.accuracy > FS_ACCURACY) {
|
|
entry.safeTime = entry.safeTime - entry.accuracy + FS_ACCURACY;
|
|
entry.accuracy = FS_ACCURACY;
|
|
}
|
|
}
|
|
|
|
function ensureFsAccuracy(mtime) {
|
|
if (!mtime) return;
|
|
if (FS_ACCURACY > 1 && mtime % 1 !== 0) FS_ACCURACY = 1;
|
|
else if (FS_ACCURACY > 10 && mtime % 10 !== 0) FS_ACCURACY = 10;
|
|
else if (FS_ACCURACY > 100 && mtime % 100 !== 0) FS_ACCURACY = 100;
|
|
else if (FS_ACCURACY > 1000 && mtime % 1000 !== 0) FS_ACCURACY = 1000;
|
|
}
|