server/lib/live/shared/muxing-session.ts

   1
   2 import { mapSeries } from 'bluebird'
   3 import { FSWatcher, watch } from 'chokidar'
   4 import { FfmpegCommand } from 'fluent-ffmpeg'
   5 import { appendFile, ensureDir, readFile, stat } from 'fs-extra'
   6 import { basename, join } from 'path'
   7 import { EventEmitter } from 'stream'
   8 import { getLiveMuxingCommand, getLiveTranscodingCommand } from '@server/helpers/ffmpeg'
   9 import { logger, loggerTagsFactory, LoggerTagsFn } from '@server/helpers/logger'
  10 import { CONFIG } from '@server/initializers/config'
  11 import { MEMOIZE_TTL, VIDEO_LIVE } from '@server/initializers/constants'
  12 import { VideoFileModel } from '@server/models/video/video-file'
  13 import { MStreamingPlaylistVideo, MUserId, MVideoLiveVideo } from '@server/types/models'
  14 import { getLiveDirectory, getLiveReplayBaseDirectory } from '../../paths'
  15 import { VideoTranscodingProfilesManager } from '../../transcoding/default-transcoding-profiles'
  16 import { isAbleToUploadVideo } from '../../user'
  17 import { LiveQuotaStore } from '../live-quota-store'
  18 import { LiveSegmentShaStore } from '../live-segment-sha-store'
  19 import { buildConcatenatedName } from '../live-utils'
  20
  21 import memoizee = require('memoizee')
  22
  23 interface MuxingSessionEvents {
  24   'master-playlist-created': ({ videoId: number }) => void
  25
  26   'bad-socket-health': ({ videoId: number }) => void
  27   'duration-exceeded': ({ videoId: number }) => void
  28   'quota-exceeded': ({ videoId: number }) => void
  29
  30   'ffmpeg-end': ({ videoId: number }) => void
  31   'ffmpeg-error': ({ videoId: string }) => void
  32
  33   'after-cleanup': ({ videoId: number }) => void
  34 }
  35
  36 declare interface MuxingSession {
  37   on<U extends keyof MuxingSessionEvents>(
  38     event: U, listener: MuxingSessionEvents[U]
  39   ): this
  40
  41   emit<U extends keyof MuxingSessionEvents>(
  42     event: U, ...args: Parameters<MuxingSessionEvents[U]>
  43   ): boolean
  44 }
  45
  46 class MuxingSession extends EventEmitter {
  47
  48   private ffmpegCommand: FfmpegCommand
  49
  50   private readonly context: any
  51   private readonly user: MUserId
  52   private readonly sessionId: string
  53   private readonly videoLive: MVideoLiveVideo
  54   private readonly streamingPlaylist: MStreamingPlaylistVideo
  55   private readonly inputUrl: string
  56   private readonly fps: number
  57   private readonly allResolutions: number[]
  58
  59   private readonly bitrate: number
  60   private readonly ratio: number
  61
  62   private readonly videoId: number
  63   private readonly videoUUID: string
  64   private readonly saveReplay: boolean
  65
  66   private readonly outDirectory: string
  67   private readonly replayDirectory: string
  68
  69   private readonly lTags: LoggerTagsFn
  70
  71   private segmentsToProcessPerPlaylist: { [playlistId: string]: string[] } = {}
  72
  73   private tsWatcher: FSWatcher
  74   private masterWatcher: FSWatcher
  75
  76   private readonly isAbleToUploadVideoWithCache = memoizee((userId: number) => {
  77     return isAbleToUploadVideo(userId, 1000)
  78   }, { maxAge: MEMOIZE_TTL.LIVE_ABLE_TO_UPLOAD })
  79
  80   private readonly hasClientSocketInBadHealthWithCache = memoizee((sessionId: string) => {
  81     return this.hasClientSocketInBadHealth(sessionId)
  82   }, { maxAge: MEMOIZE_TTL.LIVE_CHECK_SOCKET_HEALTH })
  83
  84   constructor (options: {
  85     context: any
  86     user: MUserId
  87     sessionId: string
  88     videoLive: MVideoLiveVideo
  89     streamingPlaylist: MStreamingPlaylistVideo
  90     inputUrl: string
  91     fps: number
  92     bitrate: number
  93     ratio: number
  94     allResolutions: number[]
  95   }) {
  96     super()
  97
  98     this.context = options.context
  99     this.user = options.user
 100     this.sessionId = options.sessionId
 101     this.videoLive = options.videoLive
 102     this.streamingPlaylist = options.streamingPlaylist
 103     this.inputUrl = options.inputUrl
 104     this.fps = options.fps
 105
 106     this.bitrate = options.bitrate
 107     this.ratio = options.ratio
 108
 109     this.allResolutions = options.allResolutions
 110
 111     this.videoId = this.videoLive.Video.id
 112     this.videoUUID = this.videoLive.Video.uuid
 113
 114     this.saveReplay = this.videoLive.saveReplay
 115
 116     this.outDirectory = getLiveDirectory(this.videoLive.Video)
 117     this.replayDirectory = join(getLiveReplayBaseDirectory(this.videoLive.Video), new Date().toISOString())
 118
 119     this.lTags = loggerTagsFactory('live', this.sessionId, this.videoUUID)
 120   }
 121
 122   async runMuxing () {
 123     this.createFiles()
 124
 125     await this.prepareDirectories()
 126
 127     this.ffmpegCommand = CONFIG.LIVE.TRANSCODING.ENABLED
 128       ? await getLiveTranscodingCommand({
 129         inputUrl: this.inputUrl,
 130
 131         outPath: this.outDirectory,
 132         masterPlaylistName: this.streamingPlaylist.playlistFilename,
 133
 134         latencyMode: this.videoLive.latencyMode,
 135
 136         resolutions: this.allResolutions,
 137         fps: this.fps,
 138         bitrate: this.bitrate,
 139         ratio: this.ratio,
 140
 141         availableEncoders: VideoTranscodingProfilesManager.Instance.getAvailableEncoders(),
 142         profile: CONFIG.LIVE.TRANSCODING.PROFILE
 143       })
 144       : getLiveMuxingCommand({
 145         inputUrl: this.inputUrl,
 146         outPath: this.outDirectory,
 147         masterPlaylistName: this.streamingPlaylist.playlistFilename,
 148         latencyMode: this.videoLive.latencyMode
 149       })
 150
 151     logger.info('Running live muxing/transcoding for %s.', this.videoUUID, this.lTags())
 152
 153     this.watchTSFiles()
 154     this.watchMasterFile()
 155
 156     let ffmpegShellCommand: string
 157     this.ffmpegCommand.on('start', cmdline => {
 158       ffmpegShellCommand = cmdline
 159
 160       logger.debug('Running ffmpeg command for live', { ffmpegShellCommand, ...this.lTags() })
 161     })
 162
 163     this.ffmpegCommand.on('error', (err, stdout, stderr) => {
 164       this.onFFmpegError({ err, stdout, stderr, ffmpegShellCommand })
 165     })
 166
 167     this.ffmpegCommand.on('end', () => {
 168       this.emit('ffmpeg-end', ({ videoId: this.videoId }))
 169
 170       this.onFFmpegEnded()
 171     })
 172
 173     this.ffmpegCommand.run()
 174   }
 175
 176   abort () {
 177     if (!this.ffmpegCommand) return
 178
 179     this.ffmpegCommand.kill('SIGINT')
 180   }
 181
 182   destroy () {
 183     this.removeAllListeners()
 184     this.isAbleToUploadVideoWithCache.clear()
 185     this.hasClientSocketInBadHealthWithCache.clear()
 186   }
 187
 188   private onFFmpegError (options: {
 189     err: any
 190     stdout: string
 191     stderr: string
 192     ffmpegShellCommand: string
 193   }) {
 194     const { err, stdout, stderr, ffmpegShellCommand } = options
 195
 196     this.onFFmpegEnded()
 197
 198     // Don't care that we killed the ffmpeg process
 199     if (err?.message?.includes('Exiting normally')) return
 200
 201     logger.error('Live transcoding error.', { err, stdout, stderr, ffmpegShellCommand, ...this.lTags() })
 202
 203     this.emit('ffmpeg-error', ({ videoId: this.videoId }))
 204   }
 205
 206   private onFFmpegEnded () {
 207     logger.info('RTMP transmuxing for video %s ended. Scheduling cleanup', this.inputUrl, this.lTags())
 208
 209     setTimeout(() => {
 210       // Wait latest segments generation, and close watchers
 211
 212       Promise.all([ this.tsWatcher.close(), this.masterWatcher.close() ])
 213         .then(() => {
 214           // Process remaining segments hash
 215           for (const key of Object.keys(this.segmentsToProcessPerPlaylist)) {
 216             this.processSegments(this.segmentsToProcessPerPlaylist[key])
 217           }
 218         })
 219         .catch(err => {
 220           logger.error(
 221             'Cannot close watchers of %s or process remaining hash segments.', this.outDirectory,
 222             { err, ...this.lTags() }
 223           )
 224         })
 225
 226       this.emit('after-cleanup', { videoId: this.videoId })
 227     }, 1000)
 228   }
 229
 230   private watchMasterFile () {
 231     this.masterWatcher = watch(this.outDirectory + '/' + this.streamingPlaylist.playlistFilename)
 232
 233     this.masterWatcher.on('add', () => {
 234       this.emit('master-playlist-created', { videoId: this.videoId })
 235
 236       this.masterWatcher.close()
 237         .catch(err => logger.error('Cannot close master watcher of %s.', this.outDirectory, { err, ...this.lTags() }))
 238     })
 239   }
 240
 241   private watchTSFiles () {
 242     const startStreamDateTime = new Date().getTime()
 243
 244     this.tsWatcher = watch(this.outDirectory + '/*.ts')
 245
 246     const playlistIdMatcher = /^([\d+])-/
 247
 248     const addHandler = async (segmentPath: string) => {
 249       logger.debug('Live add handler of %s.', segmentPath, this.lTags())
 250
 251       const playlistId = basename(segmentPath).match(playlistIdMatcher)[0]
 252
 253       const segmentsToProcess = this.segmentsToProcessPerPlaylist[playlistId] || []
 254       this.processSegments(segmentsToProcess)
 255
 256       this.segmentsToProcessPerPlaylist[playlistId] = [ segmentPath ]
 257
 258       if (this.hasClientSocketInBadHealthWithCache(this.sessionId)) {
 259         this.emit('bad-socket-health', { videoId: this.videoId })
 260         return
 261       }
 262
 263       // Duration constraint check
 264       if (this.isDurationConstraintValid(startStreamDateTime) !== true) {
 265         this.emit('duration-exceeded', { videoId: this.videoId })
 266         return
 267       }
 268
 269       // Check user quota if the user enabled replay saving
 270       if (await this.isQuotaExceeded(segmentPath) === true) {
 271         this.emit('quota-exceeded', { videoId: this.videoId })
 272       }
 273     }
 274
 275     const deleteHandler = (segmentPath: string) => LiveSegmentShaStore.Instance.removeSegmentSha(this.videoUUID, segmentPath)
 276
 277     this.tsWatcher.on('add', p => addHandler(p))
 278     this.tsWatcher.on('unlink', p => deleteHandler(p))
 279   }
 280
 281   private async isQuotaExceeded (segmentPath: string) {
 282     if (this.saveReplay !== true) return false
 283
 284     try {
 285       const segmentStat = await stat(segmentPath)
 286
 287       LiveQuotaStore.Instance.addQuotaTo(this.user.id, this.videoLive.id, segmentStat.size)
 288
 289       const canUpload = await this.isAbleToUploadVideoWithCache(this.user.id)
 290
 291       return canUpload !== true
 292     } catch (err) {
 293       logger.error('Cannot stat %s or check quota of %d.', segmentPath, this.user.id, { err, ...this.lTags() })
 294     }
 295   }
 296
 297   private createFiles () {
 298     for (let i = 0; i < this.allResolutions.length; i++) {
 299       const resolution = this.allResolutions[i]
 300
 301       const file = new VideoFileModel({
 302         resolution,
 303         size: -1,
 304         extname: '.ts',
 305         infoHash: null,
 306         fps: this.fps,
 307         videoStreamingPlaylistId: this.streamingPlaylist.id
 308       })
 309
 310       VideoFileModel.customUpsert(file, 'streaming-playlist', null)
 311         .catch(err => logger.error('Cannot create file for live streaming.', { err, ...this.lTags() }))
 312     }
 313   }
 314
 315   private async prepareDirectories () {
 316     await ensureDir(this.outDirectory)
 317
 318     if (this.videoLive.saveReplay === true) {
 319       await ensureDir(this.replayDirectory)
 320     }
 321   }
 322
 323   private isDurationConstraintValid (streamingStartTime: number) {
 324     const maxDuration = CONFIG.LIVE.MAX_DURATION
 325     // No limit
 326     if (maxDuration < 0) return true
 327
 328     const now = new Date().getTime()
 329     const max = streamingStartTime + maxDuration
 330
 331     return now <= max
 332   }
 333
 334   private processSegments (segmentPaths: string[]) {
 335     mapSeries(segmentPaths, async previousSegment => {
 336       // Add sha hash of previous segments, because ffmpeg should have finished generating them
 337       await LiveSegmentShaStore.Instance.addSegmentSha(this.videoUUID, previousSegment)
 338
 339       if (this.saveReplay) {
 340         await this.addSegmentToReplay(previousSegment)
 341       }
 342     }).catch(err => logger.error('Cannot process segments', { err, ...this.lTags() }))
 343   }
 344
 345   private hasClientSocketInBadHealth (sessionId: string) {
 346     const rtmpSession = this.context.sessions.get(sessionId)
 347
 348     if (!rtmpSession) {
 349       logger.warn('Cannot get session %s to check players socket health.', sessionId, this.lTags())
 350       return
 351     }
 352
 353     for (const playerSessionId of rtmpSession.players) {
 354       const playerSession = this.context.sessions.get(playerSessionId)
 355
 356       if (!playerSession) {
 357         logger.error('Cannot get player session %s to check socket health.', playerSession, this.lTags())
 358         continue
 359       }
 360
 361       if (playerSession.socket.writableLength > VIDEO_LIVE.MAX_SOCKET_WAITING_DATA) {
 362         return true
 363       }
 364     }
 365
 366     return false
 367   }
 368
 369   private async addSegmentToReplay (segmentPath: string) {
 370     const segmentName = basename(segmentPath)
 371     const dest = join(this.replayDirectory, buildConcatenatedName(segmentName))
 372
 373     try {
 374       const data = await readFile(segmentPath)
 375
 376       await appendFile(dest, data)
 377     } catch (err) {
 378       logger.error('Cannot copy segment %s to replay directory.', segmentPath, { err, ...this.lTags() })
 379     }
 380   }
 381 }
 382
 383 // ---------------------------------------------------------------------------
 384
 385 export {
 386   MuxingSession
 387 }