/* IMPORT */ import { EventEmitter } from 'node:events'; import fs from 'node:fs'; import path from 'node:path'; import { DEPTH, LIMIT, HAS_NATIVE_RECURSION, POLLING_INTERVAL } from './constants.js'; import { TargetEvent, WatcherEvent } from './enums.js'; import Utils from './utils.js'; import WatcherHandler from './watcher_handler.js'; import WatcherLocker from './watcher_locker.js'; import WatcherPoller from './watcher_poller.js'; /* MAIN */ class Watcher extends EventEmitter { /* CONSTRUCTOR */ constructor(target, options, handler) { super(); this._closed = false; this._ready = false; this._closeAborter = new AbortController(); this._closeSignal = this._closeAborter.signal; this.on(WatcherEvent.CLOSE, () => this._closeAborter.abort()); this._closeWait = new Promise(resolve => this.on(WatcherEvent.CLOSE, resolve)); this._readyWait = new Promise(resolve => this.on(WatcherEvent.READY, resolve)); this._locker = new WatcherLocker(this); this._roots = new Set(); this._poller = new WatcherPoller(); this._pollers = new Set(); this._subwatchers = new Set(); this._watchers = {}; this._watchersLock = Promise.resolve(); this._watchersRestorable = {}; this.watch(target, options, handler); } /* API */ isClosed() { return this._closed; } isIgnored(targetPath, ignore) { return !!ignore && (Utils.lang.isFunction(ignore) ? !!ignore(targetPath) : ignore.test(targetPath)); } isReady() { return this._ready; } close() { this._locker.reset(); this._poller.reset(); this._roots.clear(); this.watchersClose(); if (this.isClosed()) return false; this._closed = true; return this.emit(WatcherEvent.CLOSE); } error(exception) { if (this.isClosed()) return false; const error = Utils.lang.castError(exception); return this.emit(WatcherEvent.ERROR, error); } event(event, targetPath, targetPathNext) { if (this.isClosed()) return false; this.emit(WatcherEvent.ALL, event, targetPath, targetPathNext); return this.emit(event, targetPath, targetPathNext); } ready() { if (this.isClosed() || this.isReady()) return false; this._ready = true; return this.emit(WatcherEvent.READY); } pollerExists(targetPath, options) { for (const poller of this._pollers) { if (poller.targetPath !== targetPath) continue; if (!Utils.lang.isShallowEqual(poller.options, options)) continue; return true; } return false; } subwatcherExists(targetPath, options) { for (const subwatcher of this._subwatchers) { if (subwatcher.targetPath !== targetPath) continue; if (!Utils.lang.isShallowEqual(subwatcher.options, options)) continue; return true; } return false; } watchersClose(folderPath, filePath, recursive = true) { if (!folderPath) { for (const folderPath in this._watchers) { this.watchersClose(folderPath, filePath, false); } } else { const configs = this._watchers[folderPath]; if (configs) { for (const config of [...configs]) { // It's important to clone the array, as items will be deleted from it also if (filePath && config.filePath !== filePath) continue; this.watcherClose(config); } } if (recursive) { for (const folderPathOther in this._watchers) { if (!Utils.fs.isSubPath(folderPath, folderPathOther)) continue; this.watchersClose(folderPathOther, filePath, false); } } } } watchersLock(callback) { return this._watchersLock.then(() => { return this._watchersLock = new Promise(async (resolve) => { await callback(); resolve(); }); }); } watchersRestore() { delete this._watchersRestoreTimeout; const watchers = Object.entries(this._watchersRestorable); this._watchersRestorable = {}; for (const [targetPath, config] of watchers) { this.watchPath(targetPath, config.options, config.handler); } } async watcherAdd(config, baseWatcherHandler) { const { folderPath } = config; const configs = this._watchers[folderPath] = (this._watchers[folderPath] || []); configs.push(config); const watcherHandler = new WatcherHandler(this, config, baseWatcherHandler); await watcherHandler.init(); return watcherHandler; } watcherClose(config) { config.watcher.close(); const configs = this._watchers[config.folderPath]; if (configs) { const index = configs.indexOf(config); configs.splice(index, 1); if (!configs.length) { delete this._watchers[config.folderPath]; } } const rootPath = config.filePath || config.folderPath; const isRoot = this._roots.has(rootPath); if (isRoot) { this._watchersRestorable[rootPath] = config; if (!this._watchersRestoreTimeout) { this._watchersRestoreTimeout = Utils.lang.defer(() => this.watchersRestore()); } } } watcherExists(folderPath, options, handler, filePath) { const configsSibling = this._watchers[folderPath]; if (!!configsSibling?.find(config => config.handler === handler && (!config.filePath || config.filePath === filePath) && config.options.ignore === options.ignore && !!config.options.native === !!options.native && (!options.recursive || config.options.recursive))) return true; let folderAncestorPath = path.dirname(folderPath); for (let depth = 1; depth < Infinity; depth++) { const configsAncestor = this._watchers[folderAncestorPath]; if (!!configsAncestor?.find(config => (depth === 1 || (config.options.recursive && depth <= (config.options.depth ?? DEPTH))) && config.handler === handler && (!config.filePath || config.filePath === filePath) && config.options.ignore === options.ignore && !!config.options.native === !!options.native && (!options.recursive || (config.options.recursive && (HAS_NATIVE_RECURSION && config.options.native !== false))))) return true; if (!HAS_NATIVE_RECURSION) break; // No other ancestor will possibly be found const folderAncestorPathNext = path.dirname(folderPath); if (folderAncestorPath === folderAncestorPathNext) break; folderAncestorPath = folderAncestorPathNext; } return false; } async watchDirectories(foldersPaths, options, handler, filePath, baseWatcherHandler) { if (this.isClosed()) return; foldersPaths = Utils.lang.uniq(foldersPaths).sort(); let watcherHandlerLast; for (const folderPath of foldersPaths) { if (this.isIgnored(folderPath, options.ignore)) continue; if (this.watcherExists(folderPath, options, handler, filePath)) continue; try { const watcherOptions = (!options.recursive || (HAS_NATIVE_RECURSION && options.native !== false)) ? options : { ...options, recursive: false }; // Ensuring recursion is explicitly disabled if not available const watcher = fs.watch(folderPath, watcherOptions); const watcherConfig = { watcher, handler, options, folderPath, filePath }; const watcherHandler = watcherHandlerLast = await this.watcherAdd(watcherConfig, baseWatcherHandler); const isRoot = this._roots.has(filePath || folderPath); if (isRoot) { const parentOptions = { ...options, ignoreInitial: true, recursive: false }; // Ensuring only the parent folder is being watched const parentFolderPath = path.dirname(folderPath); const parentFilePath = folderPath; await this.watchDirectories([parentFolderPath], parentOptions, handler, parentFilePath, watcherHandler); //TODO: Watch parents recursively with the following code, which requires other things to be changed too though // while ( true ) { // await this.watchDirectories ( [parentFolderPath], parentOptions, handler, parentFilePath, watcherHandler ); // const parentFolderPathNext = path.dirname ( parentFolderPath ); // if ( parentFolderPath === parentFolderPathNext ) break; // parentFilePath = parentFolderPath; // parentFolderPath = parentFolderPathNext; // } } } catch (error) { this.error(error); } } return watcherHandlerLast; } async watchDirectory(folderPath, options, handler, filePath, baseWatcherHandler) { if (this.isClosed()) return; if (this.isIgnored(folderPath, options.ignore)) return; if (!options.recursive || (HAS_NATIVE_RECURSION && options.native !== false)) { return this.watchersLock(() => { return this.watchDirectories([folderPath], options, handler, filePath, baseWatcherHandler); }); } else { options = { ...options, recursive: true }; // Ensuring recursion is explicitly enabled const depth = options.depth ?? DEPTH; const limit = options.limit ?? LIMIT; const [folderSubPaths] = await Utils.fs.readdir(folderPath, options.ignore, depth, limit, this._closeSignal, options.readdirMap); return this.watchersLock(async () => { const watcherHandler = await this.watchDirectories([folderPath], options, handler, filePath, baseWatcherHandler); if (folderSubPaths.length) { const folderPathDepth = Utils.fs.getDepth(folderPath); for (const folderSubPath of folderSubPaths) { const folderSubPathDepth = Utils.fs.getDepth(folderSubPath); const subDepth = Math.max(0, depth - (folderSubPathDepth - folderPathDepth)); const subOptions = { ...options, depth: subDepth }; // Updating the maximum depth to account for depth of the sub path await this.watchDirectories([folderSubPath], subOptions, handler, filePath, baseWatcherHandler || watcherHandler); } } }); } } async watchFileOnce(filePath, options, callback) { if (this.isClosed()) return; options = { ...options, ignoreInitial: false }; // Ensuring initial events are detected too if (this.subwatcherExists(filePath, options)) return; const config = { targetPath: filePath, options }; const handler = (event, targetPath) => { if (targetPath !== filePath) return; stop(); callback(); }; const watcher = new Watcher(handler); const start = () => { this._subwatchers.add(config); this.on(WatcherEvent.CLOSE, stop); // Ensuring the subwatcher is stopped on close watcher.watchFile(filePath, options, handler); }; const stop = () => { this._subwatchers.delete(config); this.removeListener(WatcherEvent.CLOSE, stop); // Ensuring there are no leftover listeners watcher.close(); }; return start(); } async watchFile(filePath, options, handler) { if (this.isClosed()) return; if (this.isIgnored(filePath, options.ignore)) return; options = { ...options, recursive: false }; // Ensuring recursion is explicitly disabled const folderPath = path.dirname(filePath); return this.watchDirectory(folderPath, options, handler, filePath); } async watchPollingOnce(targetPath, options, callback) { if (this.isClosed()) return; let isDone = false; const poller = new WatcherPoller(); const disposer = await this.watchPolling(targetPath, options, async () => { if (isDone) return; const events = await poller.update(targetPath, options.pollingTimeout); if (!events.length) return; // Nothing actually changed, skipping if (isDone) return; // Another async callback has done the work already, skipping isDone = true; disposer(); callback(); }); } async watchPolling(targetPath, options, callback) { if (this.isClosed()) return Utils.lang.noop; if (this.pollerExists(targetPath, options)) return Utils.lang.noop; const watcherOptions = { ...options, interval: options.pollingInterval ?? POLLING_INTERVAL }; // Ensuring a default interval is set const config = { targetPath, options }; const start = () => { this._pollers.add(config); this.on(WatcherEvent.CLOSE, stop); // Ensuring polling is stopped on close fs.watchFile(targetPath, watcherOptions, callback); }; const stop = () => { this._pollers.delete(config); this.removeListener(WatcherEvent.CLOSE, stop); // Ensuring there are no leftover listeners fs.unwatchFile(targetPath, callback); }; Utils.lang.attempt(start); return () => Utils.lang.attempt(stop); } async watchUnknownChild(targetPath, options, handler) { if (this.isClosed()) return; const watch = () => this.watchPath(targetPath, options, handler); return this.watchFileOnce(targetPath, options, watch); } async watchUnknownTarget(targetPath, options, handler) { if (this.isClosed()) return; const watch = () => this.watchPath(targetPath, options, handler); return this.watchPollingOnce(targetPath, options, watch); } async watchPaths(targetPaths, options, handler) { if (this.isClosed()) return; targetPaths = Utils.lang.uniq(targetPaths).sort(); const isParallelizable = targetPaths.every((targetPath, index) => targetPaths.every((t, i) => i === index || !Utils.fs.isSubPath(targetPath, t))); // All paths are about separate subtrees, so we can start watching in parallel safely //TODO: Find parallelizable chunks rather than using an all or nothing approach if (isParallelizable) { // Watching in parallel await Promise.all(targetPaths.map(targetPath => { return this.watchPath(targetPath, options, handler); })); } else { // Watching serially for (const targetPath of targetPaths) { await this.watchPath(targetPath, options, handler); } } } async watchPath(targetPath, options, handler) { if (this.isClosed()) return; targetPath = path.resolve(targetPath); if (this.isIgnored(targetPath, options.ignore)) return; const stats = await Utils.fs.poll(targetPath, options.pollingTimeout); if (!stats) { const parentPath = path.dirname(targetPath); const parentStats = await Utils.fs.poll(parentPath, options.pollingTimeout); if (parentStats?.isDirectory()) { return this.watchUnknownChild(targetPath, options, handler); } else { return this.watchUnknownTarget(targetPath, options, handler); } } else if (stats.isFile()) { return this.watchFile(targetPath, options, handler); } else if (stats.isDirectory()) { return this.watchDirectory(targetPath, options, handler); } else { this.error(`"${targetPath}" is not supported`); } } async watch(target, options, handler = Utils.lang.noop) { if (Utils.lang.isFunction(target)) return this.watch([], {}, target); if (Utils.lang.isUndefined(target)) return this.watch([], options, handler); if (Utils.lang.isFunction(options)) return this.watch(target, {}, options); if (Utils.lang.isUndefined(options)) return this.watch(target, {}, handler); if (this.isClosed()) return; if (this.isReady()) options.readdirMap = undefined; // Only usable before initialization const targetPaths = Utils.lang.castArray(target); targetPaths.forEach(targetPath => this._roots.add(targetPath)); await this.watchPaths(targetPaths, options, handler); if (this.isClosed()) return; if (handler !== Utils.lang.noop) { this.on(WatcherEvent.ALL, handler); } options.readdirMap = undefined; // Only usable before initialization this.ready(); } } /* EXPORT */ export default Watcher; //# 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