Update FolderWatcher to singleton

server/Server.js

@@ -62,7 +62,6 @@ class Server {
       fs.mkdirSync(global.MetadataPath)
     }
 
-    this.watcher = new Watcher()
     this.auth = new Auth()
 
     // Managers
@@ -70,7 +69,7 @@ class Server {
     this.backupManager = new BackupManager()
     this.abMergeManager = new AbMergeManager()
     this.playbackSessionManager = new PlaybackSessionManager()
-    this.podcastManager = new PodcastManager(this.watcher)
+    this.podcastManager = new PodcastManager()
     this.audioMetadataManager = new AudioMetadataMangaer()
     this.rssFeedManager = new RssFeedManager()
     this.cronManager = new CronManager(this.podcastManager, this.playbackSessionManager)
@@ -147,9 +146,9 @@ class Server {
 
     if (Database.serverSettings.scannerDisableWatcher) {
       Logger.info(`[Server] Watcher is disabled`)
-      this.watcher.disabled = true
+      Watcher.disabled = true
     } else {
-      this.watcher.initWatcher(libraries)
+      Watcher.initWatcher(libraries)
     }
   }
 
@@ -435,7 +434,7 @@ class Server {
    */
   async stop() {
     Logger.info('=== Stopping Server ===')
-    await this.watcher.close()
+    Watcher.close()
     Logger.info('Watcher Closed')
 
     return new Promise((resolve) => {

server/Watcher.js

@@ -409,4 +409,4 @@ class FolderWatcher extends EventEmitter {
     }, 5000)
   }
 }
-module.exports = FolderWatcher
+module.exports = new FolderWatcher()

server/controllers/LibraryController.js

@@ -17,6 +17,7 @@ const naturalSort = createNewSortInstance({
 const LibraryScanner = require('../scanner/LibraryScanner')
 const Scanner = require('../scanner/Scanner')
 const Database = require('../Database')
+const Watcher = require('../Watcher')
 const libraryFilters = require('../utils/queries/libraryFilters')
 const libraryItemsPodcastFilters = require('../utils/queries/libraryItemsPodcastFilters')
 const authorFilters = require('../utils/queries/authorFilters')
@@ -158,7 +159,7 @@ class LibraryController {
     SocketAuthority.emitter('library_added', library.toOldJSON(), userFilter)
 
     // Add library watcher
-    this.watcher.addLibrary(library)
+    Watcher.addLibrary(library)
 
     res.json(library.toOldJSON())
   }
@@ -440,7 +441,7 @@ class LibraryController {
       req.library.libraryFolders = await req.library.getLibraryFolders()
 
       // Update watcher
-      this.watcher.updateLibrary(req.library)
+      Watcher.updateLibrary(req.library)
 
       hasUpdates = true
     }
@@ -466,7 +467,7 @@ class LibraryController {
    */
   async delete(req, res) {
     // Remove library watcher
-    this.watcher.removeLibrary(req.library)
+    Watcher.removeLibrary(req.library)
 
     // Remove collections for library
     const numCollectionsRemoved = await Database.collectionModel.removeAllForLibrary(req.library.id)

server/controllers/MiscController.js

@@ -5,6 +5,7 @@ const fs = require('../libs/fsExtra')
 const Logger = require('../Logger')
 const SocketAuthority = require('../SocketAuthority')
 const Database = require('../Database')
+const Watcher = require('../Watcher')
 
 const libraryItemFilters = require('../utils/queries/libraryItemFilters')
 const patternValidation = require('../libs/nodeCron/pattern-validation')
@@ -557,10 +558,10 @@ class MiscController {
 
     switch (type) {
       case 'add':
-        this.watcher.onFileAdded(libraryId, path)
+        Watcher.onFileAdded(libraryId, path)
         break
       case 'unlink':
-        this.watcher.onFileRemoved(libraryId, path)
+        Watcher.onFileRemoved(libraryId, path)
         break
       case 'rename':
         const oldPath = req.body.oldPath
@@ -568,7 +569,7 @@ class MiscController {
           Logger.error(`[MiscController] Invalid request body for updateWatchedPath. oldPath is required for rename.`)
           return res.sendStatus(400)
         }
-        this.watcher.onFileRename(libraryId, oldPath, path)
+        Watcher.onFileRename(libraryId, oldPath, path)
         break
       default:
         Logger.error(`[MiscController] Invalid type for updateWatchedPath. type: "${type}"`)

server/managers/PodcastManager.js

@@ -1,6 +1,7 @@
 const Logger = require('../Logger')
 const SocketAuthority = require('../SocketAuthority')
 const Database = require('../Database')
+const Watcher = require('../Watcher')
 
 const fs = require('../libs/fsExtra')
 
@@ -23,9 +24,7 @@ const AudioFile = require('../objects/files/AudioFile')
 const LibraryItem = require('../objects/LibraryItem')
 
 class PodcastManager {
-  constructor(watcher) {
+  constructor() {
-    this.watcher = watcher
-
     this.downloadQueue = []
     this.currentDownload = null
 
@@ -97,7 +96,7 @@ class PodcastManager {
     }
 
     // Ignores all added files to this dir
-    this.watcher.addIgnoreDir(this.currentDownload.libraryItem.path)
+    Watcher.addIgnoreDir(this.currentDownload.libraryItem.path)
 
     // Make sure podcast library item folder exists
     if (!(await fs.pathExists(this.currentDownload.libraryItem.path))) {
@@ -151,7 +150,7 @@ class PodcastManager {
     SocketAuthority.emitter('episode_download_finished', this.currentDownload.toJSONForClient())
     SocketAuthority.emitter('episode_download_queue_updated', this.getDownloadQueueDetails())
 
-    this.watcher.removeIgnoreDir(this.currentDownload.libraryItem.path)
+    Watcher.removeIgnoreDir(this.currentDownload.libraryItem.path)
     this.currentDownload = null
     if (this.downloadQueue.length) {
       this.startPodcastEpisodeDownload(this.downloadQueue.shift())

server/routers/ApiRouter.js

@@ -45,8 +45,6 @@ class ApiRouter {
     this.abMergeManager = Server.abMergeManager
     /** @type {import('../managers/BackupManager')} */
     this.backupManager = Server.backupManager
-    /** @type {import('../Watcher')} */
-    this.watcher = Server.watcher
     /** @type {import('../managers/PodcastManager')} */
     this.podcastManager = Server.podcastManager
     /** @type {import('../managers/AudioMetadataManager')} */