const Path = require('path') const EventEmitter = require('events') const Watcher = require('watcher') const Logger = require('./Logger') class FolderWatcher extends EventEmitter { constructor() { super() this.paths = [] // Not used this.pendingFiles = [] // Not used this.libraryWatchers = [] this.pendingFileUpdates = [] this.pendingDelay = 4000 this.pendingTimeout = null } get pendingFilePaths() { return this.pendingFileUpdates.map(f => f.path) } buildLibraryWatcher(library) { if (this.libraryWatchers.find(w => w.id === library.id)) { Logger.warn('[Watcher] Already watching library', library.name) return } Logger.info(`[Watcher] Initializing watcher for "${library.name}"..`) var folderPaths = library.folderPaths var watcher = new Watcher(folderPaths, { ignored: /(^|[\/\\])\../, // ignore dotfiles renameDetection: true, renameTimeout: 2000, recursive: true, ignoreInitial: true, persistent: true }) watcher .on('add', (path) => { this.onNewFile(library.id, path) }).on('change', (path) => { // This is triggered from metadata changes, not what we want // this.onFileUpdated(path) }).on('unlink', path => { this.onFileRemoved(library.id, path) }).on('rename', (path, pathNext) => { this.onRename(library.id, path, pathNext) }).on('error', (error) => { Logger.error(`[Watcher] ${error}`) }).on('ready', () => { Logger.info(`[Watcher] "${library.name}" Ready`) }) this.libraryWatchers.push({ id: library.id, name: library.name, folders: library.folders, paths: library.folderPaths, watcher }) } initWatcher(libraries) { libraries.forEach((lib) => { this.buildLibraryWatcher(lib) }) } addLibrary(library) { this.buildLibraryWatcher(library) } updateLibrary(library) { var libwatcher = this.libraryWatchers.find(lib => lib.id === library.id) if (libwatcher) { libwatcher.name = library.name var pathsToAdd = library.folderPaths.filter(path => !libwatcher.paths.includes(path)) if (pathsToAdd.length) { Logger.info(`[Watcher] Adding paths to library watcher "${library.name}"`) libwatcher.paths = library.folderPaths libwatcher.folders = library.folders libwatcher.watcher.watchPaths(pathsToAdd) } } } removeLibrary(library) { var libwatcher = this.libraryWatchers.find(lib => lib.id === library.id) if (libwatcher) { Logger.info(`[Watcher] Removed watcher for "${library.name}"`) libwatcher.watcher.close() this.libraryWatchers = this.libraryWatchers.filter(lib => lib.id !== library.id) } else { Logger.error(`[Watcher] Library watcher not found for "${library.name}"`) } } close() { return this.libraryWatchers.map(lib => lib.watcher.close()) } onNewFile(libraryId, path) { Logger.debug('[Watcher] File Added', path) this.addFileUpdate(libraryId, path, 'added') } onFileRemoved(libraryId, path) { Logger.debug('[Watcher] File Removed', path) this.addFileUpdate(libraryId, path, 'deleted') } onFileUpdated(path) { Logger.debug('[Watcher] Updated File', path) } onRename(libraryId, pathFrom, pathTo) { Logger.debug(`[Watcher] Rename ${pathFrom} => ${pathTo}`) this.addFileUpdate(libraryId, pathTo, 'renamed') } addFileUpdate(libraryId, path, type) { if (this.pendingFilePaths.includes(path)) return // Get file library var libwatcher = this.libraryWatchers.find(lw => lw.id === libraryId) if (!libwatcher) { Logger.error(`[Watcher] Invalid library id from watcher ${libraryId}`) return } // Get file folder var folder = libwatcher.folders.find(fold => path.startsWith(fold.fullPath)) if (!folder) { Logger.error(`[Watcher] New file folder not found in library "${libwatcher.name}" with path "${path}"`) return } // Check if file was added to root directory var dir = Path.dirname(path) if (dir === folder.fullPath) { Logger.warn(`[Watcher] New file "${Path.basename(path)}" added to folder root - ignoring it`) return } var relPath = path.replace(folder.fullPath, '') Logger.debug(`[Watcher] Modified file in library "${libwatcher.name}" and folder "${folder.id}" with relPath "${relPath}"`) this.pendingFileUpdates.push({ path, relPath, folderId: folder.id, libraryId, type }) // Notify server of update after "pendingDelay" clearTimeout(this.pendingTimeout) this.pendingTimeout = setTimeout(() => { this.emit('files', this.pendingFileUpdates) this.pendingFileUpdates = [] }, this.pendingDelay) } } module.exports = FolderWatcher