server/lib/live-manager.ts

   1
   2 import * as Bluebird from 'bluebird'
   3 import * as chokidar from 'chokidar'
   4 import { FfmpegCommand } from 'fluent-ffmpeg'
   5 import { appendFile, ensureDir, readFile, stat } from 'fs-extra'
   6 import { createServer, Server } from 'net'
   7 import { basename, join } from 'path'
   8 import { isTestInstance } from '@server/helpers/core-utils'
   9 import { getLiveMuxingCommand, getLiveTranscodingCommand } from '@server/helpers/ffmpeg-utils'
  10 import { computeResolutionsToTranscode, getVideoFileFPS, getVideoFileResolution } from '@server/helpers/ffprobe-utils'
  11 import { logger, loggerTagsFactory } from '@server/helpers/logger'
  12 import { CONFIG, registerConfigChangedHandler } from '@server/initializers/config'
  13 import { MEMOIZE_TTL, P2P_MEDIA_LOADER_PEER_VERSION, VIDEO_LIVE, VIEW_LIFETIME, WEBSERVER } from '@server/initializers/constants'
  14 import { UserModel } from '@server/models/user/user'
  15 import { VideoModel } from '@server/models/video/video'
  16 import { VideoFileModel } from '@server/models/video/video-file'
  17 import { VideoLiveModel } from '@server/models/video/video-live'
  18 import { VideoStreamingPlaylistModel } from '@server/models/video/video-streaming-playlist'
  19 import { MStreamingPlaylist, MStreamingPlaylistVideo, MUserId, MVideoLive, MVideoLiveVideo } from '@server/types/models'
  20 import { VideoState, VideoStreamingPlaylistType } from '@shared/models'
  21 import { federateVideoIfNeeded } from './activitypub/videos'
  22 import { buildSha256Segment } from './hls'
  23 import { JobQueue } from './job-queue'
  24 import { cleanupLive } from './job-queue/handlers/video-live-ending'
  25 import { PeerTubeSocket } from './peertube-socket'
  26 import { VideoTranscodingProfilesManager } from './transcoding/video-transcoding-profiles'
  27 import { isAbleToUploadVideo } from './user'
  28 import { getHLSDirectory } from './video-paths'
  29
  30 import memoizee = require('memoizee')
  31 const NodeRtmpSession = require('node-media-server/node_rtmp_session')
  32 const context = require('node-media-server/node_core_ctx')
  33 const nodeMediaServerLogger = require('node-media-server/node_core_logger')
  34
  35 // Disable node media server logs
  36 nodeMediaServerLogger.setLogType(0)
  37
  38 const config = {
  39   rtmp: {
  40     port: CONFIG.LIVE.RTMP.PORT,
  41     chunk_size: VIDEO_LIVE.RTMP.CHUNK_SIZE,
  42     gop_cache: VIDEO_LIVE.RTMP.GOP_CACHE,
  43     ping: VIDEO_LIVE.RTMP.PING,
  44     ping_timeout: VIDEO_LIVE.RTMP.PING_TIMEOUT
  45   },
  46   transcoding: {
  47     ffmpeg: 'ffmpeg'
  48   }
  49 }
  50
  51 const lTags = loggerTagsFactory('live')
  52
  53 class LiveManager {
  54
  55   private static instance: LiveManager
  56
  57   private readonly transSessions = new Map<string, FfmpegCommand>()
  58   private readonly videoSessions = new Map<number, string>()
  59   // Values are Date().getTime()
  60   private readonly watchersPerVideo = new Map<number, number[]>()
  61   private readonly segmentsSha256 = new Map<string, Map<string, string>>()
  62   private readonly livesPerUser = new Map<number, { liveId: number, videoId: number, size: number }[]>()
  63
  64   private readonly isAbleToUploadVideoWithCache = memoizee((userId: number) => {
  65     return isAbleToUploadVideo(userId, 1000)
  66   }, { maxAge: MEMOIZE_TTL.LIVE_ABLE_TO_UPLOAD })
  67
  68   private readonly hasClientSocketsInBadHealthWithCache = memoizee((sessionId: string) => {
  69     return this.hasClientSocketsInBadHealth(sessionId)
  70   }, { maxAge: MEMOIZE_TTL.LIVE_CHECK_SOCKET_HEALTH })
  71
  72   private rtmpServer: Server
  73
  74   private constructor () {
  75   }
  76
  77   init () {
  78     const events = this.getContext().nodeEvent
  79     events.on('postPublish', (sessionId: string, streamPath: string) => {
  80       logger.debug('RTMP received stream', { id: sessionId, streamPath, ...lTags(sessionId) })
  81
  82       const splittedPath = streamPath.split('/')
  83       if (splittedPath.length !== 3 || splittedPath[1] !== VIDEO_LIVE.RTMP.BASE_PATH) {
  84         logger.warn('Live path is incorrect.', { streamPath, ...lTags(sessionId) })
  85         return this.abortSession(sessionId)
  86       }
  87
  88       this.handleSession(sessionId, streamPath, splittedPath[2])
  89         .catch(err => logger.error('Cannot handle sessions.', { err, ...lTags(sessionId) }))
  90     })
  91
  92     events.on('donePublish', sessionId => {
  93       logger.info('Live session ended.', { sessionId, ...lTags(sessionId) })
  94     })
  95
  96     registerConfigChangedHandler(() => {
  97       if (!this.rtmpServer && CONFIG.LIVE.ENABLED === true) {
  98         this.run()
  99         return
 100       }
 101
 102       if (this.rtmpServer && CONFIG.LIVE.ENABLED === false) {
 103         this.stop()
 104       }
 105     })
 106
 107     // Cleanup broken lives, that were terminated by a server restart for example
 108     this.handleBrokenLives()
 109       .catch(err => logger.error('Cannot handle broken lives.', { err, ...lTags() }))
 110
 111     setInterval(() => this.updateLiveViews(), VIEW_LIFETIME.LIVE)
 112   }
 113
 114   run () {
 115     logger.info('Running RTMP server on port %d', config.rtmp.port, lTags())
 116
 117     this.rtmpServer = createServer(socket => {
 118       const session = new NodeRtmpSession(config, socket)
 119
 120       session.run()
 121     })
 122
 123     this.rtmpServer.on('error', err => {
 124       logger.error('Cannot run RTMP server.', { err, ...lTags() })
 125     })
 126
 127     this.rtmpServer.listen(CONFIG.LIVE.RTMP.PORT)
 128   }
 129
 130   stop () {
 131     logger.info('Stopping RTMP server.', lTags())
 132
 133     this.rtmpServer.close()
 134     this.rtmpServer = undefined
 135
 136     // Sessions is an object
 137     this.getContext().sessions.forEach((session: any) => {
 138       if (session instanceof NodeRtmpSession) {
 139         session.stop()
 140       }
 141     })
 142   }
 143
 144   isRunning () {
 145     return !!this.rtmpServer
 146   }
 147
 148   getSegmentsSha256 (videoUUID: string) {
 149     return this.segmentsSha256.get(videoUUID)
 150   }
 151
 152   stopSessionOf (videoId: number) {
 153     const sessionId = this.videoSessions.get(videoId)
 154     if (!sessionId) return
 155
 156     this.videoSessions.delete(videoId)
 157     this.abortSession(sessionId)
 158   }
 159
 160   getLiveQuotaUsedByUser (userId: number) {
 161     const currentLives = this.livesPerUser.get(userId)
 162     if (!currentLives) return 0
 163
 164     return currentLives.reduce((sum, obj) => sum + obj.size, 0)
 165   }
 166
 167   addViewTo (videoId: number) {
 168     if (this.videoSessions.has(videoId) === false) return
 169
 170     let watchers = this.watchersPerVideo.get(videoId)
 171
 172     if (!watchers) {
 173       watchers = []
 174       this.watchersPerVideo.set(videoId, watchers)
 175     }
 176
 177     watchers.push(new Date().getTime())
 178   }
 179
 180   cleanupShaSegments (videoUUID: string) {
 181     this.segmentsSha256.delete(videoUUID)
 182   }
 183
 184   addSegmentToReplay (hlsVideoPath: string, segmentPath: string) {
 185     const segmentName = basename(segmentPath)
 186     const dest = join(hlsVideoPath, VIDEO_LIVE.REPLAY_DIRECTORY, this.buildConcatenatedName(segmentName))
 187
 188     return readFile(segmentPath)
 189       .then(data => appendFile(dest, data))
 190       .catch(err => logger.error('Cannot copy segment %s to replay directory.', segmentPath, { err, ...lTags() }))
 191   }
 192
 193   buildConcatenatedName (segmentOrPlaylistPath: string) {
 194     const num = basename(segmentOrPlaylistPath).match(/^(\d+)(-|\.)/)
 195
 196     return 'concat-' + num[1] + '.ts'
 197   }
 198
 199   private processSegments (hlsVideoPath: string, videoUUID: string, videoLive: MVideoLive, segmentPaths: string[]) {
 200     Bluebird.mapSeries(segmentPaths, async previousSegment => {
 201       // Add sha hash of previous segments, because ffmpeg should have finished generating them
 202       await this.addSegmentSha(videoUUID, previousSegment)
 203
 204       if (videoLive.saveReplay) {
 205         await this.addSegmentToReplay(hlsVideoPath, previousSegment)
 206       }
 207     }).catch(err => logger.error('Cannot process segments in %s', hlsVideoPath, { err, ...lTags(videoUUID) }))
 208   }
 209
 210   private getContext () {
 211     return context
 212   }
 213
 214   private abortSession (id: string) {
 215     const session = this.getContext().sessions.get(id)
 216     if (session) {
 217       session.stop()
 218       this.getContext().sessions.delete(id)
 219     }
 220
 221     const transSession = this.transSessions.get(id)
 222     if (transSession) {
 223       transSession.kill('SIGINT')
 224       this.transSessions.delete(id)
 225     }
 226   }
 227
 228   private async handleSession (sessionId: string, streamPath: string, streamKey: string) {
 229     const videoLive = await VideoLiveModel.loadByStreamKey(streamKey)
 230     if (!videoLive) {
 231       logger.warn('Unknown live video with stream key %s.', streamKey, lTags(sessionId))
 232       return this.abortSession(sessionId)
 233     }
 234
 235     const video = videoLive.Video
 236     if (video.isBlacklisted()) {
 237       logger.warn('Video is blacklisted. Refusing stream %s.', streamKey, lTags(sessionId, video.uuid))
 238       return this.abortSession(sessionId)
 239     }
 240
 241     // Cleanup old potential live files (could happen with a permanent live)
 242     this.cleanupShaSegments(video.uuid)
 243
 244     const oldStreamingPlaylist = await VideoStreamingPlaylistModel.loadHLSPlaylistByVideo(video.id)
 245     if (oldStreamingPlaylist) {
 246       await cleanupLive(video, oldStreamingPlaylist)
 247     }
 248
 249     this.videoSessions.set(video.id, sessionId)
 250
 251     const playlistUrl = WEBSERVER.URL + VideoStreamingPlaylistModel.getHlsMasterPlaylistStaticPath(video.uuid)
 252
 253     const session = this.getContext().sessions.get(sessionId)
 254     const rtmpUrl = 'rtmp://127.0.0.1:' + config.rtmp.port + streamPath
 255
 256     const [ resolutionResult, fps ] = await Promise.all([
 257       getVideoFileResolution(rtmpUrl),
 258       getVideoFileFPS(rtmpUrl)
 259     ])
 260
 261     const resolutionsEnabled = CONFIG.LIVE.TRANSCODING.ENABLED
 262       ? computeResolutionsToTranscode(resolutionResult.videoFileResolution, 'live')
 263       : []
 264
 265     const allResolutions = resolutionsEnabled.concat([ session.videoHeight ])
 266
 267     logger.info(
 268       'Will mux/transcode live video of original resolution %d.', session.videoHeight,
 269       { allResolutions, ...lTags(sessionId, video.uuid) }
 270     )
 271
 272     const [ videoStreamingPlaylist ] = await VideoStreamingPlaylistModel.upsert({
 273       videoId: video.id,
 274       playlistUrl,
 275       segmentsSha256Url: WEBSERVER.URL + VideoStreamingPlaylistModel.getHlsSha256SegmentsStaticPath(video.uuid, video.isLive),
 276       p2pMediaLoaderInfohashes: VideoStreamingPlaylistModel.buildP2PMediaLoaderInfoHashes(playlistUrl, allResolutions),
 277       p2pMediaLoaderPeerVersion: P2P_MEDIA_LOADER_PEER_VERSION,
 278
 279       type: VideoStreamingPlaylistType.HLS
 280     }, { returning: true }) as [ MStreamingPlaylist, boolean ]
 281
 282     return this.runMuxing({
 283       sessionId,
 284       videoLive,
 285       playlist: Object.assign(videoStreamingPlaylist, { Video: video }),
 286       rtmpUrl,
 287       fps,
 288       allResolutions
 289     })
 290   }
 291
 292   private async runMuxing (options: {
 293     sessionId: string
 294     videoLive: MVideoLiveVideo
 295     playlist: MStreamingPlaylistVideo
 296     rtmpUrl: string
 297     fps: number
 298     allResolutions: number[]
 299   }) {
 300     const { sessionId, videoLive, playlist, allResolutions, fps, rtmpUrl } = options
 301     const startStreamDateTime = new Date().getTime()
 302
 303     const user = await UserModel.loadByLiveId(videoLive.id)
 304     if (!this.livesPerUser.has(user.id)) {
 305       this.livesPerUser.set(user.id, [])
 306     }
 307
 308     const currentUserLive = { liveId: videoLive.id, videoId: videoLive.videoId, size: 0 }
 309     const livesOfUser = this.livesPerUser.get(user.id)
 310     livesOfUser.push(currentUserLive)
 311
 312     for (let i = 0; i < allResolutions.length; i++) {
 313       const resolution = allResolutions[i]
 314
 315       const file = new VideoFileModel({
 316         resolution,
 317         size: -1,
 318         extname: '.ts',
 319         infoHash: null,
 320         fps,
 321         videoStreamingPlaylistId: playlist.id
 322       })
 323
 324       VideoFileModel.customUpsert(file, 'streaming-playlist', null)
 325         .catch(err => logger.error('Cannot create file for live streaming.', { err, ...lTags(sessionId, videoLive.Video.uuid) }))
 326     }
 327
 328     const outPath = getHLSDirectory(videoLive.Video)
 329     await ensureDir(outPath)
 330
 331     const replayDirectory = join(outPath, VIDEO_LIVE.REPLAY_DIRECTORY)
 332
 333     if (videoLive.saveReplay === true) {
 334       await ensureDir(replayDirectory)
 335     }
 336
 337     const videoUUID = videoLive.Video.uuid
 338
 339     const ffmpegExec = CONFIG.LIVE.TRANSCODING.ENABLED
 340       ? await getLiveTranscodingCommand({
 341         rtmpUrl,
 342         outPath,
 343         resolutions: allResolutions,
 344         fps,
 345         availableEncoders: VideoTranscodingProfilesManager.Instance.getAvailableEncoders(),
 346         profile: CONFIG.LIVE.TRANSCODING.PROFILE
 347       })
 348       : getLiveMuxingCommand(rtmpUrl, outPath)
 349
 350     logger.info('Running live muxing/transcoding for %s.', videoUUID, lTags(sessionId, videoUUID))
 351     this.transSessions.set(sessionId, ffmpegExec)
 352
 353     const tsWatcher = chokidar.watch(outPath + '/*.ts')
 354
 355     const segmentsToProcessPerPlaylist: { [playlistId: string]: string[] } = {}
 356     const playlistIdMatcher = /^([\d+])-/
 357
 358     const addHandler = segmentPath => {
 359       logger.debug('Live add handler of %s.', segmentPath, lTags(sessionId, videoUUID))
 360
 361       const playlistId = basename(segmentPath).match(playlistIdMatcher)[0]
 362
 363       const segmentsToProcess = segmentsToProcessPerPlaylist[playlistId] || []
 364       this.processSegments(outPath, videoUUID, videoLive, segmentsToProcess)
 365
 366       segmentsToProcessPerPlaylist[playlistId] = [ segmentPath ]
 367
 368       if (this.hasClientSocketsInBadHealthWithCache(sessionId)) {
 369         logger.error(
 370           'Too much data in client socket stream (ffmpeg is too slow to transcode the video).' +
 371           ' Stopping session of video %s.', videoUUID,
 372           lTags(sessionId, videoUUID)
 373         )
 374
 375         this.stopSessionOf(videoLive.videoId)
 376         return
 377       }
 378
 379       // Duration constraint check
 380       if (this.isDurationConstraintValid(startStreamDateTime) !== true) {
 381         logger.info('Stopping session of %s: max duration exceeded.', videoUUID, lTags(sessionId, videoUUID))
 382
 383         this.stopSessionOf(videoLive.videoId)
 384         return
 385       }
 386
 387       // Check user quota if the user enabled replay saving
 388       if (videoLive.saveReplay === true) {
 389         stat(segmentPath)
 390           .then(segmentStat => {
 391             currentUserLive.size += segmentStat.size
 392           })
 393           .then(() => this.isQuotaConstraintValid(user, videoLive))
 394           .then(quotaValid => {
 395             if (quotaValid !== true) {
 396               logger.info('Stopping session of %s: user quota exceeded.', videoUUID, lTags(sessionId, videoUUID))
 397
 398               this.stopSessionOf(videoLive.videoId)
 399             }
 400           })
 401           .catch(err => logger.error('Cannot stat %s or check quota of %d.', segmentPath, user.id, { err, ...lTags(sessionId, videoUUID) }))
 402       }
 403     }
 404
 405     const deleteHandler = segmentPath => this.removeSegmentSha(videoUUID, segmentPath)
 406
 407     tsWatcher.on('add', p => addHandler(p))
 408     tsWatcher.on('unlink', p => deleteHandler(p))
 409
 410     const masterWatcher = chokidar.watch(outPath + '/master.m3u8')
 411     masterWatcher.on('add', async () => {
 412       try {
 413         const video = await VideoModel.loadAndPopulateAccountAndServerAndTags(videoLive.videoId)
 414
 415         video.state = VideoState.PUBLISHED
 416         await video.save()
 417         videoLive.Video = video
 418
 419         setTimeout(() => {
 420           federateVideoIfNeeded(video, false)
 421             .catch(err => logger.error('Cannot federate live video %s.', video.url, { err, ...lTags(sessionId, videoUUID) }))
 422
 423           PeerTubeSocket.Instance.sendVideoLiveNewState(video)
 424         }, VIDEO_LIVE.SEGMENT_TIME_SECONDS * 1000 * VIDEO_LIVE.EDGE_LIVE_DELAY_SEGMENTS_NOTIFICATION)
 425
 426       } catch (err) {
 427         logger.error('Cannot save/federate live video %d.', videoLive.videoId, { err, ...lTags(sessionId, videoUUID) })
 428       } finally {
 429         masterWatcher.close()
 430           .catch(err => logger.error('Cannot close master watcher of %s.', outPath, { err, ...lTags(sessionId, videoUUID) }))
 431       }
 432     })
 433
 434     const onFFmpegEnded = () => {
 435       logger.info('RTMP transmuxing for video %s ended. Scheduling cleanup', rtmpUrl, lTags(sessionId, videoUUID))
 436
 437       this.transSessions.delete(sessionId)
 438
 439       this.watchersPerVideo.delete(videoLive.videoId)
 440       this.videoSessions.delete(videoLive.videoId)
 441
 442       const newLivesPerUser = this.livesPerUser.get(user.id)
 443                                                .filter(o => o.liveId !== videoLive.id)
 444       this.livesPerUser.set(user.id, newLivesPerUser)
 445
 446       setTimeout(() => {
 447         // Wait latest segments generation, and close watchers
 448
 449         Promise.all([ tsWatcher.close(), masterWatcher.close() ])
 450           .then(() => {
 451             // Process remaining segments hash
 452             for (const key of Object.keys(segmentsToProcessPerPlaylist)) {
 453               this.processSegments(outPath, videoUUID, videoLive, segmentsToProcessPerPlaylist[key])
 454             }
 455           })
 456           .catch(err => {
 457             logger.error(
 458               'Cannot close watchers of %s or process remaining hash segments.', outPath,
 459               { err, ...lTags(sessionId, videoUUID) }
 460             )
 461           })
 462
 463         this.onEndTransmuxing(videoLive.Video.id)
 464           .catch(err => logger.error('Error in closed transmuxing.', { err, ...lTags(sessionId, videoUUID) }))
 465       }, 1000)
 466     }
 467
 468     ffmpegExec.on('error', (err, stdout, stderr) => {
 469       onFFmpegEnded()
 470
 471       // Don't care that we killed the ffmpeg process
 472       if (err?.message?.includes('Exiting normally')) return
 473
 474       logger.error('Live transcoding error.', { err, stdout, stderr, ...lTags(sessionId, videoUUID) })
 475
 476       this.abortSession(sessionId)
 477     })
 478
 479     ffmpegExec.on('end', () => onFFmpegEnded())
 480
 481     ffmpegExec.run()
 482   }
 483
 484   private async onEndTransmuxing (videoUUID: string, cleanupNow = false) {
 485     try {
 486       const fullVideo = await VideoModel.loadAndPopulateAccountAndServerAndTags(videoUUID)
 487       if (!fullVideo) return
 488
 489       const live = await VideoLiveModel.loadByVideoId(fullVideo.id)
 490
 491       if (!live.permanentLive) {
 492         JobQueue.Instance.createJob({
 493           type: 'video-live-ending',
 494           payload: {
 495             videoId: fullVideo.id
 496           }
 497         }, { delay: cleanupNow ? 0 : VIDEO_LIVE.CLEANUP_DELAY })
 498
 499         fullVideo.state = VideoState.LIVE_ENDED
 500       } else {
 501         fullVideo.state = VideoState.WAITING_FOR_LIVE
 502       }
 503
 504       await fullVideo.save()
 505
 506       PeerTubeSocket.Instance.sendVideoLiveNewState(fullVideo)
 507
 508       await federateVideoIfNeeded(fullVideo, false)
 509     } catch (err) {
 510       logger.error('Cannot save/federate new video state of live streaming of video %d.', videoUUID, { err, ...lTags(videoUUID) })
 511     }
 512   }
 513
 514   private async addSegmentSha (videoUUID: string, segmentPath: string) {
 515     const segmentName = basename(segmentPath)
 516     logger.debug('Adding live sha segment %s.', segmentPath, lTags(videoUUID))
 517
 518     const shaResult = await buildSha256Segment(segmentPath)
 519
 520     if (!this.segmentsSha256.has(videoUUID)) {
 521       this.segmentsSha256.set(videoUUID, new Map())
 522     }
 523
 524     const filesMap = this.segmentsSha256.get(videoUUID)
 525     filesMap.set(segmentName, shaResult)
 526   }
 527
 528   private removeSegmentSha (videoUUID: string, segmentPath: string) {
 529     const segmentName = basename(segmentPath)
 530
 531     logger.debug('Removing live sha segment %s.', segmentPath, lTags(videoUUID))
 532
 533     const filesMap = this.segmentsSha256.get(videoUUID)
 534     if (!filesMap) {
 535       logger.warn('Unknown files map to remove sha for %s.', videoUUID, lTags(videoUUID))
 536       return
 537     }
 538
 539     if (!filesMap.has(segmentName)) {
 540       logger.warn('Unknown segment in files map for video %s and segment %s.', videoUUID, segmentPath, lTags(videoUUID))
 541       return
 542     }
 543
 544     filesMap.delete(segmentName)
 545   }
 546
 547   private isDurationConstraintValid (streamingStartTime: number) {
 548     const maxDuration = CONFIG.LIVE.MAX_DURATION
 549     // No limit
 550     if (maxDuration < 0) return true
 551
 552     const now = new Date().getTime()
 553     const max = streamingStartTime + maxDuration
 554
 555     return now <= max
 556   }
 557
 558   private hasClientSocketsInBadHealth (sessionId: string) {
 559     const rtmpSession = this.getContext().sessions.get(sessionId)
 560
 561     if (!rtmpSession) {
 562       logger.warn('Cannot get session %s to check players socket health.', sessionId, lTags(sessionId))
 563       return
 564     }
 565
 566     for (const playerSessionId of rtmpSession.players) {
 567       const playerSession = this.getContext().sessions.get(playerSessionId)
 568
 569       if (!playerSession) {
 570         logger.error('Cannot get player session %s to check socket health.', playerSession, lTags(sessionId))
 571         continue
 572       }
 573
 574       if (playerSession.socket.writableLength > VIDEO_LIVE.MAX_SOCKET_WAITING_DATA) {
 575         return true
 576       }
 577     }
 578
 579     return false
 580   }
 581
 582   private async isQuotaConstraintValid (user: MUserId, live: MVideoLive) {
 583     if (live.saveReplay !== true) return true
 584
 585     return this.isAbleToUploadVideoWithCache(user.id)
 586   }
 587
 588   private async updateLiveViews () {
 589     if (!this.isRunning()) return
 590
 591     if (!isTestInstance()) logger.info('Updating live video views.', lTags())
 592
 593     for (const videoId of this.watchersPerVideo.keys()) {
 594       const notBefore = new Date().getTime() - VIEW_LIFETIME.LIVE
 595
 596       const watchers = this.watchersPerVideo.get(videoId)
 597
 598       const numWatchers = watchers.length
 599
 600       const video = await VideoModel.loadAndPopulateAccountAndServerAndTags(videoId)
 601       video.views = numWatchers
 602       await video.save()
 603
 604       await federateVideoIfNeeded(video, false)
 605
 606       PeerTubeSocket.Instance.sendVideoViewsUpdate(video)
 607
 608       // Only keep not expired watchers
 609       const newWatchers = watchers.filter(w => w > notBefore)
 610       this.watchersPerVideo.set(videoId, newWatchers)
 611
 612       logger.debug('New live video views for %s is %d.', video.url, numWatchers, lTags())
 613     }
 614   }
 615
 616   private async handleBrokenLives () {
 617     const videoUUIDs = await VideoModel.listPublishedLiveUUIDs()
 618
 619     for (const uuid of videoUUIDs) {
 620       await this.onEndTransmuxing(uuid, true)
 621     }
 622   }
 623
 624   static get Instance () {
 625     return this.instance || (this.instance = new this())
 626   }
 627 }
 628
 629 // ---------------------------------------------------------------------------
 630
 631 export {
 632   LiveManager
 633 }