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var fs = require('fs'); var sysPath = require('path'); var readdirp = require('readdirp'); var isBinaryPath = require('is-binary-path'); // fs.watch helpers // object to hold per-process fs.watch instances // (may be shared across chokidar FSWatcher instances) var FsWatchInstances = Object.create(null); // Private function: Instantiates the fs.watch interface // * path - string, path to be watched // * options - object, options to be passed to fs.watch // * listener - function, main event handler // * errHandler - function, handler which emits info about errors // * emitRaw - function, handler which emits raw event data // Returns new fsevents instance function createFsWatchInstance(path, options, listener, errHandler, emitRaw) { var handleEvent = function(rawEvent, evPath) { listener(path); emitRaw(rawEvent, evPath, {watchedPath: path}); // emit based on events occurring for files from a directory's watcher in // case the file's watcher misses it (and rely on throttling to de-dupe) if (evPath && path !== evPath) { fsWatchBroadcast( sysPath.resolve(path, evPath), 'listeners', sysPath.join(path, evPath) ); } }; try { return fs.watch(path, options, handleEvent); } catch (error) { errHandler(error); } } // Private function: Helper for passing fs.watch event data to a // collection of listeners // * fullPath - string, absolute path bound to the fs.watch instance // * type - string, listener type // * val[1..3] - arguments to be passed to listeners // Returns nothing function fsWatchBroadcast(fullPath, type, val1, val2, val3) { if (!FsWatchInstances[fullPath]) return; FsWatchInstances[fullPath][type].forEach(function(listener) { listener(val1, val2, val3); }); } // Private function: Instantiates the fs.watch interface or binds listeners // to an existing one covering the same file system entry // * path - string, path to be watched // * fullPath - string, absolute path // * options - object, options to be passed to fs.watch // * handlers - object, container for event listener functions // Returns close function function setFsWatchListener(path, fullPath, options, handlers) { var listener = handlers.listener; var errHandler = handlers.errHandler; var rawEmitter = handlers.rawEmitter; var container = FsWatchInstances[fullPath]; var watcher; if (!options.persistent) { watcher = createFsWatchInstance( path, options, listener, errHandler, rawEmitter ); return watcher.close.bind(watcher); } if (!container) { watcher = createFsWatchInstance( path, options, fsWatchBroadcast.bind(null, fullPath, 'listeners'), errHandler, // no need to use broadcast here fsWatchBroadcast.bind(null, fullPath, 'rawEmitters') ); if (!watcher) return; var broadcastErr = fsWatchBroadcast.bind(null, fullPath, 'errHandlers'); watcher.on('error', function(error) { container.watcherUnusable = true; // documented since Node 10.4.1 // Workaround for https://github.com/joyent/node/issues/4337 if (process.platform === 'win32' && error.code === 'EPERM') { fs.open(path, 'r', function(err, fd) { if (!err) fs.close(fd, function(err) { if (!err) broadcastErr(error); }); }); } else { broadcastErr(error); } }); container = FsWatchInstances[fullPath] = { listeners: [listener], errHandlers: [errHandler], rawEmitters: [rawEmitter], watcher: watcher }; } else { container.listeners.push(listener); container.errHandlers.push(errHandler); container.rawEmitters.push(rawEmitter); } var listenerIndex = container.listeners.length - 1; // removes this instance's listeners and closes the underlying fs.watch // instance if there are no more listeners left return function close() { delete container.listeners[listenerIndex]; delete container.errHandlers[listenerIndex]; delete container.rawEmitters[listenerIndex]; if (!Object.keys(container.listeners).length) { if (!container.watcherUnusable) { // check to protect against issue #730 container.watcher.close(); } delete FsWatchInstances[fullPath]; } }; } // fs.watchFile helpers // object to hold per-process fs.watchFile instances // (may be shared across chokidar FSWatcher instances) var FsWatchFileInstances = Object.create(null); // Private function: Instantiates the fs.watchFile interface or binds listeners // to an existing one covering the same file system entry // * path - string, path to be watched // * fullPath - string, absolute path // * options - object, options to be passed to fs.watchFile // * handlers - object, container for event listener functions // Returns close function function setFsWatchFileListener(path, fullPath, options, handlers) { var listener = handlers.listener; var rawEmitter = handlers.rawEmitter; var container = FsWatchFileInstances[fullPath]; var listeners = []; var rawEmitters = []; if ( container && ( container.options.persistent < options.persistent || container.options.interval > options.interval ) ) { // "Upgrade" the watcher to persistence or a quicker interval. // This creates some unlikely edge case issues if the user mixes // settings in a very weird way, but solving for those cases // doesn't seem worthwhile for the added complexity. listeners = container.listeners; rawEmitters = container.rawEmitters; fs.unwatchFile(fullPath); container = false; } if (!container) { listeners.push(listener); rawEmitters.push(rawEmitter); container = FsWatchFileInstances[fullPath] = { listeners: listeners, rawEmitters: rawEmitters, options: options, watcher: fs.watchFile(fullPath, options, function(curr, prev) { container.rawEmitters.forEach(function(rawEmitter) { rawEmitter('change', fullPath, {curr: curr, prev: prev}); }); var currmtime = curr.mtime.getTime(); if (curr.size !== prev.size || currmtime > prev.mtime.getTime() || currmtime === 0) { container.listeners.forEach(function(listener) { listener(path, curr); }); } }) }; } else { container.listeners.push(listener); container.rawEmitters.push(rawEmitter); } var listenerIndex = container.listeners.length - 1; // removes this instance's listeners and closes the underlying fs.watchFile // instance if there are no more listeners left return function close() { delete container.listeners[listenerIndex]; delete container.rawEmitters[listenerIndex]; if (!Object.keys(container.listeners).length) { fs.unwatchFile(fullPath); delete FsWatchFileInstances[fullPath]; } }; } // fake constructor for attaching nodefs-specific prototype methods that // will be copied to FSWatcher's prototype function NodeFsHandler() {} // Private method: Watch file for changes with fs.watchFile or fs.watch. // * path - string, path to file or directory. // * listener - function, to be executed on fs change. // Returns close function for the watcher instance NodeFsHandler.prototype._watchWithNodeFs = function(path, listener) { var directory = sysPath.dirname(path); var basename = sysPath.basename(path); var parent = this._getWatchedDir(directory); parent.add(basename); var absolutePath = sysPath.resolve(path); var options = {persistent: this.options.persistent}; if (!listener) listener = Function.prototype; // empty function var closer; if (this.options.usePolling) { options.interval = this.enableBinaryInterval && isBinaryPath(basename) ? this.options.binaryInterval : this.options.interval; closer = setFsWatchFileListener(path, absolutePath, options, { listener: listener, rawEmitter: this.emit.bind(this, 'raw') }); } else { closer = setFsWatchListener(path, absolutePath, options, { listener: listener, errHandler: this._handleError.bind(this), rawEmitter: this.emit.bind(this, 'raw') }); } return closer; }; // Private method: Watch a file and emit add event if warranted // * file - string, the file's path // * stats - object, result of fs.stat // * initialAdd - boolean, was the file added at watch instantiation? // * callback - function, called when done processing as a newly seen file // Returns close function for the watcher instance NodeFsHandler.prototype._handleFile = function(file, stats, initialAdd, callback) { var dirname = sysPath.dirname(file); var basename = sysPath.basename(file); var parent = this._getWatchedDir(dirname); // stats is always present var prevStats = stats; // if the file is already being watched, do nothing if (parent.has(basename)) return callback(); // kick off the watcher var closer = this._watchWithNodeFs(file, function(path, newStats) { if (!this._throttle('watch', file, 5)) return; if (!newStats || newStats && newStats.mtime.getTime() === 0) { fs.stat(file, function(error, newStats) { // Fix issues where mtime is null but file is still present if (error) { this._remove(dirname, basename); } else { // Check that change event was not fired because of changed only accessTime. var at = newStats.atime.getTime(); var mt = newStats.mtime.getTime(); if (!at || at <= mt || mt !== prevStats.mtime.getTime()) { this._emit('change', file, newStats); } prevStats = newStats; } }.bind(this)); // add is about to be emitted if file not already tracked in parent } else if (parent.has(basename)) { // Check that change event was not fired because of changed only accessTime. var at = newStats.atime.getTime(); var mt = newStats.mtime.getTime(); if (!at || at <= mt || mt !== prevStats.mtime.getTime()) { this._emit('change', file, newStats); } prevStats = newStats; } }.bind(this)); // emit an add event if we're supposed to if (!(initialAdd && this.options.ignoreInitial)) { if (!this._throttle('add', file, 0)) return; this._emit('add', file, stats); } if (callback) callback(); return closer; }; // Private method: Handle symlinks encountered while reading a dir // * entry - object, entry object returned by readdirp // * directory - string, path of the directory being read // * path - string, path of this item // * item - string, basename of this item // Returns true if no more processing is needed for this entry. NodeFsHandler.prototype._handleSymlink = function(entry, directory, path, item) { var full = entry.fullPath; var dir = this._getWatchedDir(directory); if (!this.options.followSymlinks) { // watch symlink directly (don't follow) and detect changes this._readyCount++; fs.realpath(path, function(error, linkPath) { if (dir.has(item)) { if (this._symlinkPaths[full] !== linkPath) { this._symlinkPaths[full] = linkPath; this._emit('change', path, entry.stat); } } else { dir.add(item); this._symlinkPaths[full] = linkPath; this._emit('add', path, entry.stat); } this._emitReady(); }.bind(this)); return true; } // don't follow the same symlink more than once if (this._symlinkPaths[full]) return true; else this._symlinkPaths[full] = true; }; // Private method: Read directory to add / remove files from `@watched` list // and re-read it on change. // * dir - string, fs path. // * stats - object, result of fs.stat // * initialAdd - boolean, was the file added at watch instantiation? // * depth - int, depth relative to user-supplied path // * target - string, child path actually targeted for watch // * wh - object, common watch helpers for this path // * callback - function, called when dir scan is complete // Returns close function for the watcher instance NodeFsHandler.prototype._handleDir = function(dir, stats, initialAdd, depth, target, wh, callback) { var parentDir = this._getWatchedDir(sysPath.dirname(dir)); var tracked = parentDir.has(sysPath.basename(dir)); if (!(initialAdd && this.options.ignoreInitial) && !target && !tracked) { if (!wh.hasGlob || wh.globFilter(dir)) this._emit('addDir', dir, stats); } // ensure dir is tracked (harmless if redundant) parentDir.add(sysPath.basename(dir)); this._getWatchedDir(dir); var read = function(directory, initialAdd, done) { // Normalize the directory name on Windows directory = sysPath.join(directory, ''); if (!wh.hasGlob) { var throttler = this._throttle('readdir', directory, 1000); if (!throttler) return; } var previous = this._getWatchedDir(wh.path); var current = []; readdirp({ root: directory, entryType: 'all', fileFilter: wh.filterPath, directoryFilter: wh.filterDir, depth: 0, lstat: true }).on('data', function(entry) { var item = entry.path; var path = sysPath.join(directory, item); current.push(item); if (entry.stat.isSymbolicLink() && this._handleSymlink(entry, directory, path, item)) return; // Files that present in current directory snapshot // but absent in previous are added to watch list and // emit `add` event. if (item === target || !target && !previous.has(item)) { this._readyCount++; // ensure relativeness of path is preserved in case of watcher reuse path = sysPath.join(dir, sysPath.relative(dir, path)); this._addToNodeFs(path, initialAdd, wh, depth + 1); } }.bind(this)).on('end', function() { var wasThrottled = throttler ? throttler.clear() : false; if (done) done(); // Files that absent in current directory snapshot // but present in previous emit `remove` event // and are removed from @watched[directory]. previous.children().filter(function(item) { return item !== directory && current.indexOf(item) === -1 && // in case of intersecting globs; // a path may have been filtered out of this readdir, but // shouldn't be removed because it matches a different glob (!wh.hasGlob || wh.filterPath({ fullPath: sysPath.resolve(directory, item) })); }).forEach(function(item) { this._remove(directory, item); }, this); // one more time for any missed in case changes came in extremely quickly if (wasThrottled) read(directory, false); }.bind(this)).on('error', this._handleError.bind(this)); }.bind(this); var closer; if (this.options.depth == null || depth <= this.options.depth) { if (!target) read(dir, initialAdd, callback); closer = this._watchWithNodeFs(dir, function(dirPath, stats) { // if current directory is removed, do nothing if (stats && stats.mtime.getTime() === 0) return; read(dirPath, false); }); } else { callback(); } return closer; }; // Private method: Handle added file, directory, or glob pattern. // Delegates call to _handleFile / _handleDir after checks. // * path - string, path to file or directory. // * initialAdd - boolean, was the file added at watch instantiation? // * depth - int, depth relative to user-supplied path // * target - string, child path actually targeted for watch // * callback - function, indicates whether the path was found or not // Returns nothing NodeFsHandler.prototype._addToNodeFs = function(path, initialAdd, priorWh, depth, target, callback) { if (!callback) callback = Function.prototype; var ready = this._emitReady; if (this._isIgnored(path) || this.closed) { ready(); return callback(null, false); } var wh = this._getWatchHelpers(path, depth); if (!wh.hasGlob && priorWh) { wh.hasGlob = priorWh.hasGlob; wh.globFilter = priorWh.globFilter; wh.filterPath = priorWh.filterPath; wh.filterDir = priorWh.filterDir; } // evaluate what is at the path we're being asked to watch fs[wh.statMethod](wh.watchPath, function(error, stats) { if (this._handleError(error)) return callback(null, path); if (this._isIgnored(wh.watchPath, stats)) { ready(); return callback(null, false); } var initDir = function(dir, target) { return this._handleDir(dir, stats, initialAdd, depth, target, wh, ready); }.bind(this); var closer; if (stats.isDirectory()) { closer = initDir(wh.watchPath, target); } else if (stats.isSymbolicLink()) { var parent = sysPath.dirname(wh.watchPath); this._getWatchedDir(parent).add(wh.watchPath); this._emit('add', wh.watchPath, stats); closer = initDir(parent, path); // preserve this symlink's target path fs.realpath(path, function(error, targetPath) { this._symlinkPaths[sysPath.resolve(path)] = targetPath; ready(); }.bind(this)); } else { closer = this._handleFile(wh.watchPath, stats, initialAdd, ready); } if (closer) { this._closers[path] = this._closers[path] || []; this._closers[path].push(closer); } callback(null, false); }.bind(this)); }; module.exports = NodeFsHandler;