From 39979ff8a349048e21e08933114d1cedb6a4fe7e Mon Sep 17 00:00:00 2001
From: advplyr <advplyr@protonmail.com>
Date: Sun, 2 Oct 2022 14:16:17 -0500
Subject: [PATCH] Add:Tasks widget in appbar for merging m4bs & remove old m4b
 merge routes

---
 client/components/app/Appbar.vue              |   4 +-
 client/components/modals/item/tabs/Tools.vue  |   2 +-
 .../components/widgets/NotificationWidget.vue |  25 ++
 client/layouts/default.vue                    |  83 ++----
 client/pages/audiobook/_id/manage.vue         |  41 ++-
 client/store/downloads.js                     |  34 ---
 client/store/tasks.js                         |  31 +++
 server/Server.js                              |   9 +-
 server/controllers/MiscController.js          |  50 +---
 server/managers/AbMergeManager.js             | 239 ++++++------------
 server/managers/AudioMetadataManager.js       |   3 +-
 server/managers/DownloadManager.js            |  16 --
 server/managers/TaskManager.js                |  20 ++
 server/objects/AbManagerTask.js               | 122 ---------
 server/objects/Task.js                        |  56 ++++
 server/routers/ApiRouter.js                   |   7 +-
 16 files changed, 285 insertions(+), 457 deletions(-)
 create mode 100644 client/components/widgets/NotificationWidget.vue
 delete mode 100644 client/store/downloads.js
 create mode 100644 client/store/tasks.js
 create mode 100644 server/managers/TaskManager.js
 delete mode 100644 server/objects/AbManagerTask.js
 create mode 100644 server/objects/Task.js

diff --git a/client/components/app/Appbar.vue b/client/components/app/Appbar.vue
index 8f30c5d9..bd98283b 100644
--- a/client/components/app/Appbar.vue
+++ b/client/components/app/Appbar.vue
@@ -7,7 +7,7 @@
         </nuxt-link>
 
         <nuxt-link to="/">
-          <h1 class="text-2xl font-book mr-6 hidden lg:block hover:underline">audiobookshelf</h1>
+          <h1 class="text-2xl font-book mr-6 hidden lg:block hover:underline">audiobookshelf <span v-if="showExperimentalFeatures" class="material-icons text-lg text-warning pr-1">logo_dev</span></h1>
         </nuxt-link>
 
         <ui-libraries-dropdown class="mr-2" />
@@ -15,7 +15,7 @@
         <controls-global-search v-if="currentLibrary" class="mr-1 sm:mr-0" />
         <div class="flex-grow" />
 
-        <span v-if="showExperimentalFeatures" class="material-icons text-2xl md:text-4xl text-warning pr-0 sm:pr-2 md:pr-4">logo_dev</span>
+        <widgets-notification-widget class="hidden md:block" />
 
         <ui-tooltip v-if="isChromecastInitialized && !isHttps" direction="bottom" text="Casting requires a secure connection" class="flex items-center">
           <span class="material-icons-outlined text-warning text-opacity-50"> cast </span>
diff --git a/client/components/modals/item/tabs/Tools.vue b/client/components/modals/item/tabs/Tools.vue
index 3ea05089..4f902ea3 100644
--- a/client/components/modals/item/tabs/Tools.vue
+++ b/client/components/modals/item/tabs/Tools.vue
@@ -42,7 +42,7 @@
         </div>
         <div class="flex-grow" />
         <div>
-          <ui-btn :to="`/audiobook/${libraryItemId}/manage`" class="flex items-center"
+          <ui-btn :to="`/audiobook/${libraryItemId}/manage?tool=embed`" class="flex items-center"
             >Open Manager
             <span class="material-icons text-lg ml-2">launch</span>
           </ui-btn>
diff --git a/client/components/widgets/NotificationWidget.vue b/client/components/widgets/NotificationWidget.vue
new file mode 100644
index 00000000..6c3e82fd
--- /dev/null
+++ b/client/components/widgets/NotificationWidget.vue
@@ -0,0 +1,25 @@
+<template>
+  <div v-if="tasksRunning" class="w-4 h-4 mx-3 relative">
+    <div class="flex h-full items-center justify-center">
+      <widgets-loading-spinner />
+    </div>
+  </div>
+</template>
+
+<script>
+export default {
+  data() {
+    return {}
+  },
+  computed: {
+    tasks() {
+      return this.$store.state.tasks.tasks
+    },
+    tasksRunning() {
+      return this.tasks.some((t) => !t.isFinished)
+    }
+  },
+  methods: {},
+  mounted() {}
+}
+</script>
\ No newline at end of file
diff --git a/client/layouts/default.vue b/client/layouts/default.vue
index 1a23cde7..826c0cb7 100644
--- a/client/layouts/default.vue
+++ b/client/layouts/default.vue
@@ -270,6 +270,14 @@ export default {
 
       this.$store.commit('scanners/addUpdate', data)
     },
+    taskStarted(task) {
+      console.log('Task started', task)
+      this.$store.commit('tasks/addUpdateTask', task)
+    },
+    taskFinished(task) {
+      console.log('Task finished', task)
+      this.$store.commit('tasks/addUpdateTask', task)
+    },
     userUpdated(user) {
       if (this.$store.state.user.user.id === user.id) {
         this.$store.commit('user/setUser', user)
@@ -302,53 +310,6 @@ export default {
       }
       this.$store.commit('user/removeCollection', collection)
     },
-    abmergeStarted(download) {
-      download.status = this.$constants.DownloadStatus.PENDING
-      download.toastId = this.$toast(`Preparing download "${download.filename}"`, { timeout: false, draggable: false, closeOnClick: false })
-      this.$store.commit('downloads/addUpdateDownload', download)
-    },
-    abmergeReady(download) {
-      download.status = this.$constants.DownloadStatus.READY
-      var existingDownload = this.$store.getters['downloads/getDownload'](download.id)
-
-      if (existingDownload && existingDownload.toastId !== undefined) {
-        download.toastId = existingDownload.toastId
-        this.$toast.update(existingDownload.toastId, { content: `Download "${download.filename}" is ready!`, options: { timeout: 5000, type: 'success' } }, true)
-      } else {
-        this.$toast.success(`Download "${download.filename}" is ready!`)
-      }
-      this.$store.commit('downloads/addUpdateDownload', download)
-    },
-    abmergeFailed(download) {
-      download.status = this.$constants.DownloadStatus.FAILED
-      var existingDownload = this.$store.getters['downloads/getDownload'](download.id)
-
-      var failedMsg = download.isTimedOut ? 'timed out' : 'failed'
-
-      if (existingDownload && existingDownload.toastId !== undefined) {
-        download.toastId = existingDownload.toastId
-        this.$toast.update(existingDownload.toastId, { content: `Download "${download.filename}" ${failedMsg}`, options: { timeout: 5000, type: 'error' } }, true)
-      } else {
-        console.warn('Download failed no existing download', existingDownload)
-        this.$toast.error(`Download "${download.filename}" ${failedMsg}`)
-      }
-      this.$store.commit('downloads/addUpdateDownload', download)
-    },
-    abmergeKilled(download) {
-      var existingDownload = this.$store.getters['downloads/getDownload'](download.id)
-      if (existingDownload && existingDownload.toastId !== undefined) {
-        download.toastId = existingDownload.toastId
-        this.$toast.update(existingDownload.toastId, { content: `Download "${download.filename}" was terminated`, options: { timeout: 5000, type: 'error' } }, true)
-      } else {
-        console.warn('Download killed no existing download found', existingDownload)
-        this.$toast.error(`Download "${download.filename}" was terminated`)
-      }
-      this.$store.commit('downloads/removeDownload', download)
-    },
-    abmergeExpired(download) {
-      download.status = this.$constants.DownloadStatus.EXPIRED
-      this.$store.commit('downloads/addUpdateDownload', download)
-    },
     rssFeedOpen(data) {
       this.$store.commit('feeds/addFeed', data)
     },
@@ -362,7 +323,7 @@ export default {
     batchQuickMatchComplete(result) {
       var success = result.success || false
       var toast = 'Batch quick match complete!\n' + result.updates + ' Updated'
-      if (result.unmatched && (result.unmatched > 0)) {
+      if (result.unmatched && result.unmatched > 0) {
         toast += '\n' + result.unmatched + ' with no matches'
       }
       if (success) {
@@ -430,19 +391,16 @@ export default {
       this.socket.on('scan_complete', this.scanComplete)
       this.socket.on('scan_progress', this.scanProgress)
 
-      // Download Listeners
-      this.socket.on('abmerge_started', this.abmergeStarted)
-      this.socket.on('abmerge_ready', this.abmergeReady)
-      this.socket.on('abmerge_failed', this.abmergeFailed)
-      this.socket.on('abmerge_killed', this.abmergeKilled)
-      this.socket.on('abmerge_expired', this.abmergeExpired)
+      // Task Listeners
+      this.socket.on('task_started', this.taskStarted)
+      this.socket.on('task_finished', this.taskFinished)
 
       // Feed Listeners
       this.socket.on('rss_feed_open', this.rssFeedOpen)
       this.socket.on('rss_feed_closed', this.rssFeedClosed)
 
       this.socket.on('backup_applied', this.backupApplied)
-      
+
       this.socket.on('batch_quickmatch_complete', this.batchQuickMatchComplete)
     },
     showUpdateToast(versionData) {
@@ -548,6 +506,19 @@ export default {
       // Queue auto play
       var playerQueueAutoPlay = localStorage.getItem('playerQueueAutoPlay')
       this.$store.commit('setPlayerQueueAutoPlay', playerQueueAutoPlay !== '0')
+    },
+    loadTasks() {
+      this.$axios
+        .$get('/api/tasks')
+        .then((payload) => {
+          console.log('Fetched tasks', payload)
+          if (payload.tasks) {
+            this.$store.commit('tasks/setTasks', payload.tasks)
+          }
+        })
+        .catch((error) => {
+          console.error('Failed to load tasks', error)
+        })
     }
   },
   beforeMount() {
@@ -565,6 +536,8 @@ export default {
 
     this.checkVersionUpdate()
 
+    this.loadTasks()
+
     if (this.$route.query.error) {
       this.$toast.error(this.$route.query.error)
       this.$router.replace(this.$route.path)
diff --git a/client/pages/audiobook/_id/manage.vue b/client/pages/audiobook/_id/manage.vue
index f9198c63..af277048 100644
--- a/client/pages/audiobook/_id/manage.vue
+++ b/client/pages/audiobook/_id/manage.vue
@@ -45,7 +45,7 @@
         <div class="w-full max-h-72 overflow-auto">
           <p v-if="!metadataChapters.length" class="py-5 text-center text-gray-200">No chapters</p>
           <template v-for="(chapter, index) in metadataChapters">
-            <div :key="index" class="flex py-1 px-4 text-sm" :class="index % 2 === 0 ? 'bg-primary bg-opacity-25' : ''">
+            <div :key="index" class="flex py-1 px-4 text-sm" :class="index % 2 === 1 ? 'bg-primary bg-opacity-25' : ''">
               <div class="flex-grow font-semibold">{{ chapter.title }}</div>
               <div class="w-24">
                 {{ $secondsToTimestamp(chapter.start) }}
@@ -67,7 +67,8 @@
         <p v-else class="text-success text-lg font-semibold">Embed Finished!</p>
       </div>
       <div v-else class="w-full flex justify-end items-center mb-4">
-        <ui-btn v-if="!isFinished" color="primary" :loading="processing" @click.stop="encodeM4bClick">Start M4B Encode</ui-btn>
+        <ui-btn v-if="!isTaskFinished" color="primary" :loading="processing" @click.stop="encodeM4bClick">Start M4B Encode</ui-btn>
+        <p v-else-if="taskFailed" class="text-error text-lg font-semibold">M4B Failed! {{ taskError }}</p>
         <p v-else class="text-success text-lg font-semibold">M4B Finished!</p>
       </div>
 
@@ -160,14 +161,23 @@ export default {
   },
   data() {
     return {
+      processing: false,
       audiofilesEncoding: {},
       audiofilesFinished: {},
-      processing: false,
       isFinished: false,
       toneObject: null,
       selectedTool: 'embed'
     }
   },
+  watch: {
+    task: {
+      handler(newVal) {
+        if (newVal) {
+          this.taskUpdated(newVal)
+        }
+      }
+    }
+  },
   computed: {
     libraryItemId() {
       return this.libraryItem.id
@@ -202,6 +212,21 @@ export default {
           { value: 'm4b', text: 'M4B Encoder' }
         ]
       }
+    },
+    taskFailed() {
+      return this.isTaskFinished && this.task.isFailed
+    },
+    taskError() {
+      return this.taskFailed ? this.task.error || 'Unknown Error' : null
+    },
+    isTaskFinished() {
+      return this.task && this.task.isFinished
+    },
+    task() {
+      return this.$store.getters['tasks/getTaskByLibraryItemId'](this.libraryItemId)
+    },
+    taskRunning() {
+      return this.task && !this.task.isFinished
     }
   },
   methods: {
@@ -210,12 +235,12 @@ export default {
       this.$axios
         .$get(`/api/audiobook-merge/${this.libraryItemId}`)
         .then(() => {
-          this.processing = false
+          console.log('Ab m4b merge started')
         })
         .catch((error) => {
           var errorMsg = error.response ? error.response.data || 'Unknown Error' : 'Unknown Error'
           this.$toast.error(errorMsg)
-          this.processing = false
+          this.processing = true
         })
     },
     embedClick() {
@@ -246,7 +271,6 @@ export default {
       console.log('audio metadata started', data)
       if (data.libraryItemId !== this.libraryItemId) return
       this.audiofilesFinished = {}
-      this.processing = true
     },
     audioMetadataFinished(data) {
       console.log('audio metadata finished', data)
@@ -278,6 +302,8 @@ export default {
           this.selectedToolUpdated()
         }
       }
+
+      if (this.task) this.taskUpdated(this.task)
     },
     fetchToneObject() {
       this.$axios
@@ -289,6 +315,9 @@ export default {
         .catch((error) => {
           console.error('Failed to fetch tone object', error)
         })
+    },
+    taskUpdated(task) {
+      this.processing = !task.isFinished
     }
   },
   mounted() {
diff --git a/client/store/downloads.js b/client/store/downloads.js
deleted file mode 100644
index a499528a..00000000
--- a/client/store/downloads.js
+++ /dev/null
@@ -1,34 +0,0 @@
-
-export const state = () => ({
-  downloads: []
-})
-
-export const getters = {
-  getDownloads: (state) => (libraryItemId) => {
-    return state.downloads.filter(d => d.libraryItemId === libraryItemId)
-  },
-  getDownload: (state) => (id) => {
-    return state.downloads.find(d => d.id === id)
-  }
-}
-
-export const actions = {
-
-}
-
-export const mutations = {
-  setDownloads(state, downloads) {
-    state.downloads = downloads
-  },
-  addUpdateDownload(state, download) {
-    var index = state.downloads.findIndex(d => d.id === download.id)
-    if (index >= 0) {
-      state.downloads.splice(index, 1, download)
-    } else {
-      state.downloads.push(download)
-    }
-  },
-  removeDownload(state, download) {
-    state.downloads = state.downloads.filter(d => d.id !== download.id)
-  }
-}
\ No newline at end of file
diff --git a/client/store/tasks.js b/client/store/tasks.js
new file mode 100644
index 00000000..55e3121e
--- /dev/null
+++ b/client/store/tasks.js
@@ -0,0 +1,31 @@
+
+export const state = () => ({
+  tasks: []
+})
+
+export const getters = {
+  getTaskByLibraryItemId: (state) => (libraryItemId) => {
+    return state.tasks.find(t => t.data && t.data.libraryItemId === libraryItemId)
+  }
+}
+
+export const actions = {
+
+}
+
+export const mutations = {
+  setTasks(state, tasks) {
+    state.tasks = tasks
+  },
+  addUpdateTask(state, task) {
+    var index = state.tasks.findIndex(d => d.id === task.id)
+    if (index >= 0) {
+      state.tasks.splice(index, 1, task)
+    } else {
+      state.tasks.push(task)
+    }
+  },
+  removeTask(state, task) {
+    state.tasks = state.tasks.filter(d => d.id !== task.id)
+  }
+}
\ No newline at end of file
diff --git a/server/Server.js b/server/Server.js
index 6259fde4..b03feb6d 100644
--- a/server/Server.js
+++ b/server/Server.js
@@ -34,6 +34,7 @@ const PodcastManager = require('./managers/PodcastManager')
 const AudioMetadataMangaer = require('./managers/AudioMetadataManager')
 const RssFeedManager = require('./managers/RssFeedManager')
 const CronManager = require('./managers/CronManager')
+const TaskManager = require('./managers/TaskManager')
 
 class Server {
   constructor(SOURCE, PORT, HOST, UID, GID, CONFIG_PATH, METADATA_PATH, ROUTER_BASE_PATH) {
@@ -66,22 +67,23 @@ class Server {
     this.auth = new Auth(this.db)
 
     // Managers
+    this.taskManager = new TaskManager(this.emitter.bind(this))
     this.notificationManager = new NotificationManager(this.db, this.emitter.bind(this))
     this.backupManager = new BackupManager(this.db, this.emitter.bind(this))
     this.logManager = new LogManager(this.db)
     this.cacheManager = new CacheManager()
-    this.abMergeManager = new AbMergeManager(this.db, this.clientEmitter.bind(this))
+    this.abMergeManager = new AbMergeManager(this.db, this.taskManager, this.clientEmitter.bind(this))
     this.playbackSessionManager = new PlaybackSessionManager(this.db, this.emitter.bind(this), this.clientEmitter.bind(this))
     this.coverManager = new CoverManager(this.db, this.cacheManager)
     this.podcastManager = new PodcastManager(this.db, this.watcher, this.emitter.bind(this), this.notificationManager)
-    this.audioMetadataManager = new AudioMetadataMangaer(this.db, this.emitter.bind(this), this.clientEmitter.bind(this))
+    this.audioMetadataManager = new AudioMetadataMangaer(this.db, this.taskManager, this.emitter.bind(this), this.clientEmitter.bind(this))
     this.rssFeedManager = new RssFeedManager(this.db, this.emitter.bind(this))
 
     this.scanner = new Scanner(this.db, this.coverManager, this.emitter.bind(this))
     this.cronManager = new CronManager(this.db, this.scanner, this.podcastManager)
 
     // Routers
-    this.apiRouter = new ApiRouter(this.db, this.auth, this.scanner, this.playbackSessionManager, this.abMergeManager, this.coverManager, this.backupManager, this.watcher, this.cacheManager, this.podcastManager, this.audioMetadataManager, this.rssFeedManager, this.cronManager, this.notificationManager, this.emitter.bind(this), this.clientEmitter.bind(this))
+    this.apiRouter = new ApiRouter(this.db, this.auth, this.scanner, this.playbackSessionManager, this.abMergeManager, this.coverManager, this.backupManager, this.watcher, this.cacheManager, this.podcastManager, this.audioMetadataManager, this.rssFeedManager, this.cronManager, this.notificationManager, this.taskManager, this.emitter.bind(this), this.clientEmitter.bind(this))
     this.hlsRouter = new HlsRouter(this.db, this.auth, this.playbackSessionManager, this.emitter.bind(this))
     this.staticRouter = new StaticRouter(this.db)
 
@@ -127,7 +129,6 @@ class Server {
 
   async init() {
     Logger.info('[Server] Init v' + version)
-    await this.abMergeManager.removeOrphanDownloads()
     await this.playbackSessionManager.removeOrphanStreams()
 
     var previousVersion = await this.db.checkPreviousVersion() // Returns null if same server version
diff --git a/server/controllers/MiscController.js b/server/controllers/MiscController.js
index c9b15007..fa8ca416 100644
--- a/server/controllers/MiscController.js
+++ b/server/controllers/MiscController.js
@@ -110,55 +110,13 @@ class MiscController {
     res.sendStatus(200)
   }
 
-  // GET: api/ab-manager-tasks/:id
-  async getAbManagerTask(req, res) {
-    if (!req.user.canDownload) {
-      Logger.error('User attempting to download without permission', req.user)
-      return res.sendStatus(403)
-    }
-    var taskId = req.params.id
-    Logger.info('Download Request', taskId)
-    var task = this.abMergeManager.getTask(taskId)
-    if (!task) {
-      Logger.error('Ab manager task request not found', taskId)
-      return res.sendStatus(404)
-    }
-
-    var options = {
-      headers: {
-        'Content-Type': task.mimeType
-      }
-    }
-    res.download(task.path, task.filename, options, (err) => {
-      if (err) {
-        Logger.error('Download Error', err)
-      }
+  // GET: api/tasks
+  getTasks(req, res) {
+    res.json({
+      tasks: this.taskManager.tasks.map(t => t.toJSON())
     })
   }
 
-  // DELETE: api/ab-manager-tasks/:id
-  async removeAbManagerTask(req, res) {
-    if (!req.user.canDownload || !req.user.canDelete) {
-      Logger.error('User attempting to remove ab manager task without permission', req.user.username)
-      return res.sendStatus(403)
-    }
-    this.abMergeManager.removeTaskById(req.params.id)
-    res.sendStatus(200)
-  }
-
-  // GET: api/ab-manager-tasks
-  async getAbManagerTasks(req, res) {
-    if (!req.user.canDownload) {
-      Logger.error('User attempting to get ab manager tasks without permission', req.user.username)
-      return res.sendStatus(403)
-    }
-    var taskData = {
-      tasks: this.abMergeManager.tasks,
-      pendingTasks: this.abMergeManager.pendingTasks
-    }
-    res.json(taskData)
-  }
-
   // PATCH: api/settings (admin)
   async updateServerSettings(req, res) {
     if (!req.user.isAdminOrUp) {
diff --git a/server/managers/AbMergeManager.js b/server/managers/AbMergeManager.js
index 65d81060..3fd7a9ba 100644
--- a/server/managers/AbMergeManager.js
+++ b/server/managers/AbMergeManager.js
@@ -4,23 +4,22 @@ const fs = require('../libs/fsExtra')
 
 const workerThreads = require('worker_threads')
 const Logger = require('../Logger')
-const AbManagerTask = require('../objects/AbManagerTask')
+const Task = require('../objects/Task')
 const filePerms = require('../utils/filePerms')
-const { getId } = require('../utils/index')
 const { writeConcatFile } = require('../utils/ffmpegHelpers')
 const toneHelpers = require('../utils/toneHelpers')
-const { getFileSize } = require('../utils/fileUtils')
 
 class AbMergeManager {
-  constructor(db, clientEmitter) {
+  constructor(db, taskManager, clientEmitter) {
     this.db = db
+    this.taskManager = taskManager
     this.clientEmitter = clientEmitter
 
+    this.itemsCacheDir = Path.join(global.MetadataPath, 'cache/items')
     this.downloadDirPath = Path.join(global.MetadataPath, 'downloads')
     this.downloadDirPathExist = false
 
     this.pendingTasks = []
-    this.tasks = []
   }
 
   async ensureDownloadDirPath() { // Creates download path if necessary and sets owner and permissions
@@ -39,85 +38,47 @@ class AbMergeManager {
     this.downloadDirPathExist = true
   }
 
-  getTask(taskId) {
-    return this.tasks.find(d => d.id === taskId)
-  }
-
-  removeTaskById(taskId) {
-    var task = this.getTask(taskId)
-    if (task) {
-      this.removeTask(task)
-    }
-  }
-
-  async removeOrphanDownloads() {
-    try {
-      var dirs = await fs.readdir(this.downloadDirPath)
-      if (!dirs || !dirs.length) return true
-
-      dirs = dirs.filter(d => d.startsWith('abmerge'))
-
-      await Promise.all(dirs.map(async (dirname) => {
-        var fullPath = Path.join(this.downloadDirPath, dirname)
-        Logger.info(`Removing Orphan Download ${dirname}`)
-        return fs.remove(fullPath)
-      }))
-      return true
-    } catch (error) {
-      return false
-    }
-  }
-
   async startAudiobookMerge(user, libraryItem) {
-    var taskId = getId('abmerge')
-    var dlpath = Path.join(this.downloadDirPath, taskId)
-    Logger.info(`Start audiobook merge for ${libraryItem.id} - TaskId: ${taskId} - ${dlpath}`)
+    const task = new Task()
 
-    var audiobookDirname = Path.basename(libraryItem.path)
-    var filename = audiobookDirname + '.m4b'
-    var taskData = {
-      id: taskId,
+    const audiobookDirname = Path.basename(libraryItem.path)
+    const targetFilename = audiobookDirname + '.m4b'
+    const itemCachePath = Path.join(this.itemsCacheDir, libraryItem.id)
+    const tempFilepath = Path.join(itemCachePath, targetFilename)
+    const taskData = {
       libraryItemId: libraryItem.id,
-      type: 'abmerge',
-      dirpath: dlpath,
-      path: Path.join(dlpath, filename),
-      filename,
-      ext: '.m4b',
-      userId: user.id,
       libraryItemPath: libraryItem.path,
-      originalTrackPaths: libraryItem.media.tracks.map(t => t.metadata.path)
+      userId: user.id,
+      originalTrackPaths: libraryItem.media.tracks.map(t => t.metadata.path),
+      tempFilepath,
+      targetFilename,
+      targetFilepath: Path.join(libraryItem.path, targetFilename),
+      itemCachePath,
+      toneMetadataObject: null
     }
-    var abManagerTask = new AbManagerTask()
-    abManagerTask.setData(taskData)
-    abManagerTask.setTimeoutTimer(this.downloadTimedOut.bind(this))
+    const taskDescription = `Encoding audiobook "${libraryItem.media.metadata.title}" into a single m4b file.`
+    task.setData('encode-m4b', 'Encoding M4b', taskDescription, taskData)
+    this.taskManager.addTask(task)
+    Logger.info(`Start m4b encode for ${libraryItem.id} - TaskId: ${task.id}`)
 
-    try {
-      await fs.mkdir(abManagerTask.dirpath)
-    } catch (error) {
-      Logger.error(`[AbMergeManager] Failed to make directory ${abManagerTask.dirpath}`)
-      Logger.debug(`[AbMergeManager] Make directory error: ${error}`)
-      var taskJson = abManagerTask.toJSON()
-      this.clientEmitter(user.id, 'abmerge_failed', taskJson)
-      return
+    if (!await fs.pathExists(taskData.itemCachePath)) {
+      await fs.mkdir(taskData.itemCachePath)
     }
 
-    this.clientEmitter(user.id, 'abmerge_started', abManagerTask.toJSON())
-    this.runAudiobookMerge(libraryItem, abManagerTask)
+    this.runAudiobookMerge(libraryItem, task)
   }
 
-  async runAudiobookMerge(libraryItem, abManagerTask) {
+  async runAudiobookMerge(libraryItem, task) {
     // If changing audio file type then encoding is needed
     var audioTracks = libraryItem.media.tracks
-    var audioRequiresEncode = audioTracks[0].metadata.ext !== abManagerTask.ext
-    var shouldIncludeCover = libraryItem.media.coverPath
+    var audioRequiresEncode = audioTracks[0].metadata.ext !== '.m4b'
     var firstTrackIsM4b = audioTracks[0].metadata.ext.toLowerCase() === '.m4b'
     var isOneTrack = audioTracks.length === 1
 
     const ffmpegInputs = []
 
     if (!isOneTrack) {
-      var concatFilePath = Path.join(abManagerTask.dirpath, 'files.txt')
-      console.log('Write files.txt', concatFilePath)
+      var concatFilePath = Path.join(task.data.itemCachePath, 'files.txt')
       await writeConcatFile(audioTracks, concatFilePath)
       ffmpegInputs.push({
         input: concatFilePath,
@@ -132,7 +93,7 @@ class AbMergeManager {
 
     const logLevel = process.env.NODE_ENV === 'production' ? 'error' : 'warning'
     var ffmpegOptions = [`-loglevel ${logLevel}`]
-    var ffmpegOutputOptions = []
+    var ffmpegOutputOptions = ['-f mp4']
 
     if (audioRequiresEncode) {
       ffmpegOptions = ffmpegOptions.concat([
@@ -140,25 +101,20 @@ class AbMergeManager {
         '-acodec aac',
         '-ac 2',
         '-b:a 64k'
-        // '-movflags use_metadata_tags'
       ])
     } else {
       ffmpegOptions.push('-max_muxing_queue_size 1000')
 
-      if (isOneTrack && firstTrackIsM4b && !shouldIncludeCover) {
+      if (isOneTrack && firstTrackIsM4b) {
         ffmpegOptions.push('-c copy')
       } else {
         ffmpegOptions.push('-c:a copy')
       }
     }
-    if (abManagerTask.ext === '.m4b') {
-      ffmpegOutputOptions.push('-f mp4')
-    }
-
 
     var chaptersFilePath = null
     if (libraryItem.media.chapters.length) {
-      chaptersFilePath = Path.join(abManagerTask.dirpath, 'chapters.txt')
+      chaptersFilePath = Path.join(task.data.itemCachePath, 'chapters.txt')
       try {
         await toneHelpers.writeToneChaptersFile(libraryItem.media.chapters, chaptersFilePath)
       } catch (error) {
@@ -169,7 +125,7 @@ class AbMergeManager {
 
     const toneMetadataObject = toneHelpers.getToneMetadataObject(libraryItem, chaptersFilePath)
     toneMetadataObject.TrackNumber = 1
-    abManagerTask.toneMetadataObject = toneMetadataObject
+    task.data.toneMetadataObject = toneMetadataObject
 
     Logger.debug(`[AbMergeManager] Book "${libraryItem.media.metadata.title}" tone metadata object=`, toneMetadataObject)
 
@@ -177,7 +133,7 @@ class AbMergeManager {
       inputs: ffmpegInputs,
       options: ffmpegOptions,
       outputOptions: ffmpegOutputOptions,
-      output: abManagerTask.path,
+      output: task.data.tempFilepath
     }
 
     var worker = null
@@ -186,137 +142,83 @@ class AbMergeManager {
       worker = new workerThreads.Worker(workerPath, { workerData })
     } catch (error) {
       Logger.error(`[AbMergeManager] Start worker thread failed`, error)
-      if (abManagerTask.userId) {
-        var taskJson = abManagerTask.toJSON()
-        this.clientEmitter(abManagerTask.userId, 'abmerge_failed', taskJson)
-      }
-      this.removeTask(abManagerTask)
+      task.setFailed('Failed to start worker thread')
+      this.removeTask(task, true)
       return
     }
 
     worker.on('message', (message) => {
       if (message != null && typeof message === 'object') {
         if (message.type === 'RESULT') {
-          if (!abManagerTask.isTimedOut) {
-            this.sendResult(abManagerTask, message)
-          }
+          this.sendResult(task, message)
         } else if (message.type === 'FFMPEG') {
           if (Logger[message.level]) {
             Logger[message.level](message.log)
           }
         }
-      } else {
-        Logger.error('Invalid worker message', message)
       }
     })
     this.pendingTasks.push({
-      id: abManagerTask.id,
-      abManagerTask,
+      id: task.id,
+      task,
       worker
     })
   }
 
-  async sendResult(abManagerTask, result) {
-    abManagerTask.clearTimeoutTimer()
-
+  async sendResult(task, result) {
     // Remove pending task
-    this.pendingTasks = this.pendingTasks.filter(d => d.id !== abManagerTask.id)
+    this.pendingTasks = this.pendingTasks.filter(d => d.id !== task.id)
 
     if (result.isKilled) {
-      if (abManagerTask.userId) {
-        this.clientEmitter(abManagerTask.userId, 'abmerge_killed', abManagerTask.toJSON())
-      }
+      task.setFailed('Ffmpeg task killed')
+      this.removeTask(task, true)
       return
     }
 
     if (!result.success) {
-      if (abManagerTask.userId) {
-        this.clientEmitter(abManagerTask.userId, 'abmerge_failed', abManagerTask.toJSON())
-      }
-      this.removeTask(abManagerTask)
+      task.setFailed('Encoding failed')
+      this.removeTask(task, true)
       return
     }
 
     // Write metadata to merged file
-    const success = await toneHelpers.tagAudioFile(abManagerTask.path, abManagerTask.toneMetadataObject)
+    const success = await toneHelpers.tagAudioFile(task.data.tempFilepath, task.data.toneMetadataObject)
     if (!success) {
-      Logger.error(`[AbMergeManager] Failed to write metadata to file "${abManagerTask.path}"`)
-      if (abManagerTask.userId) {
-        this.clientEmitter(abManagerTask.userId, 'abmerge_failed', abManagerTask.toJSON())
-      }
-      this.removeTask(abManagerTask)
+      Logger.error(`[AbMergeManager] Failed to write metadata to file "${task.data.tempFilepath}"`)
+      task.setFailed('Failed to write metadata to m4b file')
+      this.removeTask(task, true)
       return
     }
 
     // Move library item tracks to cache
-    const itemCacheDir = Path.join(global.MetadataPath, `cache/items/${abManagerTask.libraryItemId}`)
-    await fs.ensureDir(itemCacheDir)
-    for (const trackPath of abManagerTask.originalTrackPaths) {
+    for (const trackPath of task.data.originalTrackPaths) {
       const trackFilename = Path.basename(trackPath)
-      const moveToPath = Path.join(itemCacheDir, trackFilename)
+      const moveToPath = Path.join(task.data.itemCachePath, trackFilename)
       Logger.debug(`[AbMergeManager] Backing up original track "${trackPath}" to ${moveToPath}`)
       await fs.move(trackPath, moveToPath, { overwrite: true }).catch((err) => {
         Logger.error(`[AbMergeManager] Failed to move track "${trackPath}" to "${moveToPath}"`, err)
       })
     }
 
+    // Move m4b to target
+    Logger.debug(`[AbMergeManager] Moving m4b from ${task.data.tempFilepath} to ${task.data.targetFilepath}`)
+    await fs.move(task.data.tempFilepath, task.data.targetFilepath)
+
     // Set file permissions and ownership
-    await filePerms.setDefault(abManagerTask.path)
-    await filePerms.setDefault(itemCacheDir)
+    await filePerms.setDefault(task.data.targetFilepath)
+    await filePerms.setDefault(task.data.itemCachePath)
 
-    // Move merged file to library item
-    const moveToPath = Path.join(abManagerTask.libraryItemPath, abManagerTask.filename)
-    Logger.debug(`[AbMergeManager] Moving merged audiobook to library item at "${moveToPath}"`)
-    const moveSuccess = await fs.move(abManagerTask.path, moveToPath, { overwrite: true }).then(() => true).catch((err) => {
-      Logger.error(`[AbMergeManager] Failed to move merged audiobook from "${abManagerTask.path}" to "${moveToPath}"`, err)
-      return false
-    })
-    if (!moveSuccess) {
-      // TODO: Revert cached og files?
-    }
-
-    var filesize = await getFileSize(abManagerTask.path)
-    abManagerTask.setComplete(filesize)
-    if (abManagerTask.userId) {
-      this.clientEmitter(abManagerTask.userId, 'abmerge_ready', abManagerTask.toJSON())
-    }
-    // abManagerTask.setExpirationTimer(this.downloadExpired.bind(this))
-
-    // this.tasks.push(abManagerTask)
-    await this.removeTask(abManagerTask)
-    Logger.info(`[AbMergeManager] Ab task finished ${abManagerTask.id}`)
+    task.setFinished()
+    await this.removeTask(task, false)
+    Logger.info(`[AbMergeManager] Ab task finished ${task.id}`)
   }
 
-  // async downloadExpired(abManagerTask) {
-  //   Logger.info(`[AbMergeManager] Download ${abManagerTask.id} expired`)
-
-  //   if (abManagerTask.userId) {
-  //     this.clientEmitter(abManagerTask.userId, 'abmerge_expired', abManagerTask.toJSON())
-  //   }
-  //   this.removeTask(abManagerTask)
-  // }
-
-  async downloadTimedOut(abManagerTask) {
-    Logger.info(`[AbMergeManager] Download ${abManagerTask.id} timed out (${abManagerTask.timeoutTimeMs}ms)`)
-
-    if (abManagerTask.userId) {
-      var taskJson = abManagerTask.toJSON()
-      taskJson.isTimedOut = true
-      this.clientEmitter(abManagerTask.userId, 'abmerge_failed', taskJson)
-    }
-    this.removeTask(abManagerTask)
-  }
-
-  async removeTask(abManagerTask) {
-    Logger.info('[AbMergeManager] Removing task ' + abManagerTask.id)
-
-    abManagerTask.clearTimeoutTimer()
-    // abManagerTask.clearExpirationTimer()
-
-    var pendingDl = this.pendingTasks.find(d => d.id === abManagerTask.id)
+  async removeTask(task, removeTempFilepath = false) {
+    Logger.info('[AbMergeManager] Removing task ' + task.id)
 
+    const pendingDl = this.pendingTasks.find(d => d.id === task.id)
     if (pendingDl) {
-      this.pendingTasks = this.pendingTasks.filter(d => d.id !== abManagerTask.id)
+      this.pendingTasks = this.pendingTasks.filter(d => d.id !== task.id)
       Logger.warn(`[AbMergeManager] Removing download in progress - stopping worker`)
       if (pendingDl.worker) {
         try {
@@ -327,12 +229,17 @@ class AbMergeManager {
       }
     }
 
-    await fs.remove(abManagerTask.dirpath).then(() => {
-      Logger.info('[AbMergeManager] Deleted download', abManagerTask.dirpath)
-    }).catch((err) => {
-      Logger.error('[AbMergeManager] Failed to delete download', err)
-    })
-    this.tasks = this.tasks.filter(d => d.id !== abManagerTask.id)
+    if (removeTempFilepath) { // On failed tasks remove the bad file if it exists
+      if (await fs.pathExists(task.data.tempFilepath)) {
+        await fs.remove(task.data.tempFilepath).then(() => {
+          Logger.info('[AbMergeManager] Deleted target file', task.data.tempFilepath)
+        }).catch((err) => {
+          Logger.error('[AbMergeManager] Failed to delete target file', err)
+        })
+      }
+    }
+
+    this.taskManager.taskFinished(task)
   }
 }
 module.exports = AbMergeManager
diff --git a/server/managers/AudioMetadataManager.js b/server/managers/AudioMetadataManager.js
index 9af3927e..02a44ce1 100644
--- a/server/managers/AudioMetadataManager.js
+++ b/server/managers/AudioMetadataManager.js
@@ -8,8 +8,9 @@ const { writeMetadataFile } = require('../utils/ffmpegHelpers')
 const toneHelpers = require('../utils/toneHelpers')
 
 class AudioMetadataMangaer {
-  constructor(db, emitter, clientEmitter) {
+  constructor(db, taskManager, emitter, clientEmitter) {
     this.db = db
+    this.taskManager = taskManager
     this.emitter = emitter
     this.clientEmitter = clientEmitter
   }
diff --git a/server/managers/DownloadManager.js b/server/managers/DownloadManager.js
index 50a933e6..9697eeb8 100644
--- a/server/managers/DownloadManager.js
+++ b/server/managers/DownloadManager.js
@@ -25,22 +25,6 @@ class DownloadManager {
     return this.downloads.find(d => d.id === downloadId)
   }
 
-  async removeOrphanDownloads() {
-    try {
-      var dirs = await fs.readdir(this.downloadDirPath)
-      if (!dirs || !dirs.length) return true
-
-      await Promise.all(dirs.map(async (dirname) => {
-        var fullPath = Path.join(this.downloadDirPath, dirname)
-        Logger.info(`Removing Orphan Download ${dirname}`)
-        return fs.remove(fullPath)
-      }))
-      return true
-    } catch (error) {
-      return false
-    }
-  }
-
   downloadSocketRequest(socket, payload) {
     var client = socket.sheepClient
     var audiobook = this.db.audiobooks.find(a => a.id === payload.audiobookId)
diff --git a/server/managers/TaskManager.js b/server/managers/TaskManager.js
new file mode 100644
index 00000000..acd573e6
--- /dev/null
+++ b/server/managers/TaskManager.js
@@ -0,0 +1,20 @@
+class TaskManager {
+  constructor(emitter) {
+    this.emitter = emitter
+
+    this.tasks = []
+  }
+
+  addTask(task) {
+    this.tasks.push(task)
+    this.emitter('task_started', task.toJSON())
+  }
+
+  taskFinished(task) {
+    if (this.tasks.some(t => t.id === task.id)) {
+      this.tasks = this.tasks.filter(t => t !== task.id)
+      this.emitter('task_finished', task.toJSON())
+    }
+  }
+}
+module.exports = TaskManager
\ No newline at end of file
diff --git a/server/objects/AbManagerTask.js b/server/objects/AbManagerTask.js
deleted file mode 100644
index 9d857c09..00000000
--- a/server/objects/AbManagerTask.js
+++ /dev/null
@@ -1,122 +0,0 @@
-const { AudioMimeType } = require('../utils/constants')
-const { getAudioMimeTypeFromExtname } = require('../utils/fileUtils')
-const DEFAULT_EXPIRATION = 1000 * 60 * 60 // 60 minutes
-const DEFAULT_TIMEOUT = 1000 * 60 * 30 // 30 minutes
-
-class AbManagerTask {
-  constructor() {
-    this.id = null
-    this.libraryItemId = null
-    this.libraryItemPath = null
-    this.type = null
-
-    this.dirpath = null
-    this.path = null
-    this.ext = null
-    this.filename = null
-    this.size = 0
-    this.toneMetadataObject = null
-    this.originalTrackPaths = []
-
-    this.userId = null
-    this.isReady = false
-    this.isTimedOut = false
-
-    this.startedAt = null
-    this.finishedAt = null
-    this.expiresAt = null
-
-    this.expirationTimeMs = 0
-    this.timeoutTimeMs = 0
-
-    this.timeoutTimer = null
-    this.expirationTimer = null
-  }
-
-  get mimeType() {
-    return getAudioMimeTypeFromExtname(this.ext) || AudioMimeType.MP3
-  }
-
-  toJSON() {
-    return {
-      id: this.id,
-      libraryItemId: this.libraryItemId,
-      type: this.type,
-      dirpath: this.dirpath,
-      path: this.path,
-      ext: this.ext,
-      filename: this.filename,
-      size: this.size,
-      userId: this.userId,
-      isReady: this.isReady,
-      startedAt: this.startedAt,
-      finishedAt: this.finishedAt,
-      expirationSeconds: this.expirationSeconds,
-      toneMetadataObject: this.toneMetadataObject
-    }
-  }
-
-  setData(downloadData) {
-    downloadData.startedAt = Date.now()
-    downloadData.isProcessing = true
-    this.construct(downloadData)
-  }
-
-  construct(download) {
-    this.id = download.id
-    this.libraryItemId = download.libraryItemId
-    this.libraryItemPath = download.libraryItemPath
-    this.type = download.type
-
-    this.dirpath = download.dirpath
-    this.path = download.path
-    this.ext = download.ext
-    this.filename = download.filename
-    this.size = download.size || 0
-    this.originalTrackPaths = download.originalTrackPaths
-
-    this.userId = download.userId
-    this.isReady = !!download.isReady
-
-    this.startedAt = download.startedAt
-    this.finishedAt = download.finishedAt || null
-
-    this.expirationTimeMs = download.expirationTimeMs || DEFAULT_EXPIRATION
-    this.timeoutTimeMs = download.timeoutTimeMs || DEFAULT_TIMEOUT
-
-    this.expiresAt = download.expiresAt || null
-  }
-
-  setComplete(fileSize) {
-    this.finishedAt = Date.now()
-    this.size = fileSize
-    this.isReady = true
-    this.expiresAt = this.finishedAt + this.expirationTimeMs
-  }
-
-  setExpirationTimer(callback) {
-    this.expirationTimer = setTimeout(() => {
-      if (callback) {
-        callback(this)
-      }
-    }, this.expirationTimeMs)
-  }
-
-  setTimeoutTimer(callback) {
-    this.timeoutTimer = setTimeout(() => {
-      if (callback) {
-        this.isTimedOut = true
-        callback(this)
-      }
-    }, this.timeoutTimeMs)
-  }
-
-  clearTimeoutTimer() {
-    clearTimeout(this.timeoutTimer)
-  }
-
-  clearExpirationTimer() {
-    clearTimeout(this.expirationTimer)
-  }
-}
-module.exports = AbManagerTask
\ No newline at end of file
diff --git a/server/objects/Task.js b/server/objects/Task.js
new file mode 100644
index 00000000..eebb6637
--- /dev/null
+++ b/server/objects/Task.js
@@ -0,0 +1,56 @@
+const { getId } = require('../utils/index')
+
+class Task {
+  constructor() {
+    this.id = null
+    this.action = null // e.g. embed-metadata, encode-m4b, etc
+    this.data = null // additional info for the action like libraryItemId
+
+    this.title = null
+    this.description = null
+    this.error = null
+
+    this.isFailed = false
+    this.isFinished = false
+
+    this.startedAt = null
+    this.finishedAt = null
+  }
+
+  toJSON() {
+    return {
+      id: this.id,
+      action: this.action,
+      data: this.data ? { ...this.data } : {},
+      title: this.title,
+      description: this.description,
+      error: this.error,
+      isFailed: this.isFailed,
+      isFinished: this.isFinished,
+      startedAt: this.startedAt,
+      finishedAt: this.finishedAt
+    }
+  }
+
+  setData(action, title, description, data = {}) {
+    this.id = getId(action)
+    this.action = action
+    this.data = { ...data }
+    this.title = title
+    this.description = description
+    this.startedAt = Date.now()
+  }
+
+  setFailed(message) {
+    this.error = message
+    this.isFailed = true
+    this.failedAt = Date.now()
+    this.setFinished()
+  }
+
+  setFinished() {
+    this.isFinished = true
+    this.finishedAt = Date.now()
+  }
+}
+module.exports = Task
\ No newline at end of file
diff --git a/server/routers/ApiRouter.js b/server/routers/ApiRouter.js
index c9220e5a..1fac3fae 100644
--- a/server/routers/ApiRouter.js
+++ b/server/routers/ApiRouter.js
@@ -26,7 +26,7 @@ const Series = require('../objects/entities/Series')
 const FileSystemController = require('../controllers/FileSystemController')
 
 class ApiRouter {
-  constructor(db, auth, scanner, playbackSessionManager, abMergeManager, coverManager, backupManager, watcher, cacheManager, podcastManager, audioMetadataManager, rssFeedManager, cronManager, notificationManager, emitter, clientEmitter) {
+  constructor(db, auth, scanner, playbackSessionManager, abMergeManager, coverManager, backupManager, watcher, cacheManager, podcastManager, audioMetadataManager, rssFeedManager, cronManager, notificationManager, taskManager, emitter, clientEmitter) {
     this.db = db
     this.auth = auth
     this.scanner = scanner
@@ -41,6 +41,7 @@ class ApiRouter {
     this.rssFeedManager = rssFeedManager
     this.cronManager = cronManager
     this.notificationManager = notificationManager
+    this.taskManager = taskManager
     this.emitter = emitter
     this.clientEmitter = clientEmitter
 
@@ -224,9 +225,7 @@ class ApiRouter {
     //
     this.router.post('/upload', MiscController.handleUpload.bind(this))
     this.router.get('/audiobook-merge/:id', MiscController.mergeAudiobook.bind(this))
-    this.router.get('/ab-manager-tasks/:id', MiscController.getAbManagerTask.bind(this))
-    this.router.delete('/ab-manager-tasks/:id', MiscController.removeAbManagerTask.bind(this))
-    this.router.get('/ab-manager-tasks', MiscController.getAbManagerTasks.bind(this))
+    this.router.get('/tasks', MiscController.getTasks.bind(this))
     this.router.patch('/settings', MiscController.updateServerSettings.bind(this)) // Root only
     this.router.post('/purgecache', MiscController.purgeCache.bind(this)) // Root only
     this.router.post('/authorize', MiscController.authorize.bind(this))