2 files changed, 342 insertions, 0 deletions

diff --git a/server/lib/live/shared/index.ts b/server/lib/live/shared/index.ts
new file mode 100644
index 000000000..c4d1b59ec
--- /dev/null
+++ b/server/lib/live/shared/index.ts
@@ -0,0 +1 @@
+export * from './muxing-session'
diff --git a/server/lib/live/shared/muxing-session.ts b/server/lib/live/shared/muxing-session.ts
new file mode 100644
index 000000000..96f6c2c89
--- /dev/null
+++ b/server/lib/live/shared/muxing-session.ts
@@ -0,0 +1,341 @@
+
+import * as Bluebird from 'bluebird'
+import * as chokidar from 'chokidar'
+import { FfmpegCommand } from 'fluent-ffmpeg'
+import { appendFile, ensureDir, readFile, stat } from 'fs-extra'
+import { basename, join } from 'path'
+import { EventEmitter } from 'stream'
+import { getLiveMuxingCommand, getLiveTranscodingCommand } from '@server/helpers/ffmpeg-utils'
+import { logger, loggerTagsFactory, LoggerTagsFn } from '@server/helpers/logger'
+import { CONFIG } from '@server/initializers/config'
+import { MEMOIZE_TTL, VIDEO_LIVE } from '@server/initializers/constants'
+import { VideoFileModel } from '@server/models/video/video-file'
+import { MStreamingPlaylistVideo, MUserId, MVideoLiveVideo } from '@server/types/models'
+import { VideoTranscodingProfilesManager } from '../../transcoding/video-transcoding-profiles'
+import { isAbleToUploadVideo } from '../../user'
+import { getHLSDirectory } from '../../video-paths'
+import { LiveQuotaStore } from '../live-quota-store'
+import { LiveSegmentShaStore } from '../live-segment-sha-store'
+import { buildConcatenatedName } from '../live-utils'
+
+import memoizee = require('memoizee')
+
+interface MuxingSessionEvents {
+  'master-playlist-created': ({ videoId: number }) => void
+
+  'bad-socket-health': ({ videoId: number }) => void
+  'duration-exceeded': ({ videoId: number }) => void
+  'quota-exceeded': ({ videoId: number }) => void
+
+  'ffmpeg-end': ({ videoId: number }) => void
+  'ffmpeg-error': ({ sessionId: string }) => void
+
+  'after-cleanup': ({ videoId: number }) => void
+}
+
+declare interface MuxingSession {
+  on<U extends keyof MuxingSessionEvents>(
+    event: U, listener: MuxingSessionEvents[U]
+  ): this
+
+  emit<U extends keyof MuxingSessionEvents>(
+    event: U, ...args: Parameters<MuxingSessionEvents[U]>
+  ): boolean
+}
+
+class MuxingSession extends EventEmitter {
+
+  private ffmpegCommand: FfmpegCommand
+
+  private readonly context: any
+  private readonly user: MUserId
+  private readonly sessionId: string
+  private readonly videoLive: MVideoLiveVideo
+  private readonly streamingPlaylist: MStreamingPlaylistVideo
+  private readonly rtmpUrl: string
+  private readonly fps: number
+  private readonly allResolutions: number[]
+
+  private readonly videoId: number
+  private readonly videoUUID: string
+  private readonly saveReplay: boolean
+
+  private readonly lTags: LoggerTagsFn
+
+  private segmentsToProcessPerPlaylist: { [playlistId: string]: string[] } = {}
+
+  private tsWatcher: chokidar.FSWatcher
+  private masterWatcher: chokidar.FSWatcher
+
+  private readonly isAbleToUploadVideoWithCache = memoizee((userId: number) => {
+    return isAbleToUploadVideo(userId, 1000)
+  }, { maxAge: MEMOIZE_TTL.LIVE_ABLE_TO_UPLOAD })
+
+  private readonly hasClientSocketInBadHealthWithCache = memoizee((sessionId: string) => {
+    return this.hasClientSocketInBadHealth(sessionId)
+  }, { maxAge: MEMOIZE_TTL.LIVE_CHECK_SOCKET_HEALTH })
+
+  constructor (options: {
+    context: any
+    user: MUserId
+    sessionId: string
+    videoLive: MVideoLiveVideo
+    streamingPlaylist: MStreamingPlaylistVideo
+    rtmpUrl: string
+    fps: number
+    allResolutions: number[]
+  }) {
+    super()
+
+    this.context = options.context
+    this.user = options.user
+    this.sessionId = options.sessionId
+    this.videoLive = options.videoLive
+    this.streamingPlaylist = options.streamingPlaylist
+    this.rtmpUrl = options.rtmpUrl
+    this.fps = options.fps
+    this.allResolutions = options.allResolutions
+
+    this.videoId = this.videoLive.Video.id
+    this.videoUUID = this.videoLive.Video.uuid
+
+    this.saveReplay = this.videoLive.saveReplay
+
+    this.lTags = loggerTagsFactory('live', this.sessionId, this.videoUUID)
+  }
+
+  async runMuxing () {
+    this.createFiles()
+
+    const outPath = await this.prepareDirectories()
+
+    this.ffmpegCommand = CONFIG.LIVE.TRANSCODING.ENABLED
+      ? await getLiveTranscodingCommand({
+        rtmpUrl: this.rtmpUrl,
+        outPath,
+        resolutions: this.allResolutions,
+        fps: this.fps,
+        availableEncoders: VideoTranscodingProfilesManager.Instance.getAvailableEncoders(),
+        profile: CONFIG.LIVE.TRANSCODING.PROFILE
+      })
+      : getLiveMuxingCommand(this.rtmpUrl, outPath)
+
+    logger.info('Running live muxing/transcoding for %s.', this.videoUUID, this.lTags)
+
+    this.watchTSFiles(outPath)
+    this.watchMasterFile(outPath)
+
+    this.ffmpegCommand.on('error', (err, stdout, stderr) => {
+      this.onFFmpegError(err, stdout, stderr, outPath)
+    })
+
+    this.ffmpegCommand.on('end', () => this.onFFmpegEnded(outPath))
+
+    this.ffmpegCommand.run()
+  }
+
+  abort () {
+    if (!this.ffmpegCommand) return false
+
+    this.ffmpegCommand.kill('SIGINT')
+    return true
+  }
+
+  private onFFmpegError (err: any, stdout: string, stderr: string, outPath: string) {
+    this.onFFmpegEnded(outPath)
+
+    // Don't care that we killed the ffmpeg process
+    if (err?.message?.includes('Exiting normally')) return
+
+    logger.error('Live transcoding error.', { err, stdout, stderr, ...this.lTags })
+
+    this.emit('ffmpeg-error', ({ sessionId: this.sessionId }))
+  }
+
+  private onFFmpegEnded (outPath: string) {
+    logger.info('RTMP transmuxing for video %s ended. Scheduling cleanup', this.rtmpUrl, this.lTags)
+
+    setTimeout(() => {
+      // Wait latest segments generation, and close watchers
+
+      Promise.all([ this.tsWatcher.close(), this.masterWatcher.close() ])
+        .then(() => {
+          // Process remaining segments hash
+          for (const key of Object.keys(this.segmentsToProcessPerPlaylist)) {
+            this.processSegments(outPath, this.segmentsToProcessPerPlaylist[key])
+          }
+        })
+        .catch(err => {
+          logger.error(
+            'Cannot close watchers of %s or process remaining hash segments.', outPath,
+            { err, ...this.lTags }
+          )
+        })
+
+      this.emit('after-cleanup', { videoId: this.videoId })
+    }, 1000)
+  }
+
+  private watchMasterFile (outPath: string) {
+    this.masterWatcher = chokidar.watch(outPath + '/master.m3u8')
+
+    this.masterWatcher.on('add', async () => {
+      this.emit('master-playlist-created', { videoId: this.videoId })
+
+      this.masterWatcher.close()
+        .catch(err => logger.error('Cannot close master watcher of %s.', outPath, { err, ...this.lTags }))
+    })
+  }
+
+  private watchTSFiles (outPath: string) {
+    const startStreamDateTime = new Date().getTime()
+
+    this.tsWatcher = chokidar.watch(outPath + '/*.ts')
+
+    const playlistIdMatcher = /^([\d+])-/
+
+    const addHandler = async segmentPath => {
+      logger.debug('Live add handler of %s.', segmentPath, this.lTags)
+
+      const playlistId = basename(segmentPath).match(playlistIdMatcher)[0]
+
+      const segmentsToProcess = this.segmentsToProcessPerPlaylist[playlistId] || []
+      this.processSegments(outPath, segmentsToProcess)
+
+      this.segmentsToProcessPerPlaylist[playlistId] = [ segmentPath ]
+
+      if (this.hasClientSocketInBadHealthWithCache(this.sessionId)) {
+        this.emit('bad-socket-health', { videoId: this.videoId })
+        return
+      }
+
+      // Duration constraint check
+      if (this.isDurationConstraintValid(startStreamDateTime) !== true) {
+        this.emit('duration-exceeded', { videoId: this.videoId })
+        return
+      }
+
+      // Check user quota if the user enabled replay saving
+      if (await this.isQuotaExceeded(segmentPath) === true) {
+        this.emit('quota-exceeded', { videoId: this.videoId })
+      }
+    }
+
+    const deleteHandler = segmentPath => LiveSegmentShaStore.Instance.removeSegmentSha(this.videoUUID, segmentPath)
+
+    this.tsWatcher.on('add', p => addHandler(p))
+    this.tsWatcher.on('unlink', p => deleteHandler(p))
+  }
+
+  private async isQuotaExceeded (segmentPath: string) {
+    if (this.saveReplay !== true) return false
+
+    try {
+      const segmentStat = await stat(segmentPath)
+
+      LiveQuotaStore.Instance.addQuotaTo(this.user.id, this.videoLive.id, segmentStat.size)
+
+      const canUpload = await this.isAbleToUploadVideoWithCache(this.user.id)
+
+      return canUpload !== true
+    } catch (err) {
+      logger.error('Cannot stat %s or check quota of %d.', segmentPath, this.user.id, { err, ...this.lTags })
+    }
+  }
+
+  private createFiles () {
+    for (let i = 0; i < this.allResolutions.length; i++) {
+      const resolution = this.allResolutions[i]
+
+      const file = new VideoFileModel({
+        resolution,
+        size: -1,
+        extname: '.ts',
+        infoHash: null,
+        fps: this.fps,
+        videoStreamingPlaylistId: this.streamingPlaylist.id
+      })
+
+      VideoFileModel.customUpsert(file, 'streaming-playlist', null)
+        .catch(err => logger.error('Cannot create file for live streaming.', { err, ...this.lTags }))
+    }
+  }
+
+  private async prepareDirectories () {
+    const outPath = getHLSDirectory(this.videoLive.Video)
+    await ensureDir(outPath)
+
+    const replayDirectory = join(outPath, VIDEO_LIVE.REPLAY_DIRECTORY)
+
+    if (this.videoLive.saveReplay === true) {
+      await ensureDir(replayDirectory)
+    }
+
+    return outPath
+  }
+
+  private isDurationConstraintValid (streamingStartTime: number) {
+    const maxDuration = CONFIG.LIVE.MAX_DURATION
+    // No limit
+    if (maxDuration < 0) return true
+
+    const now = new Date().getTime()
+    const max = streamingStartTime + maxDuration
+
+    return now <= max
+  }
+
+  private processSegments (hlsVideoPath: string, segmentPaths: string[]) {
+    Bluebird.mapSeries(segmentPaths, async previousSegment => {
+      // Add sha hash of previous segments, because ffmpeg should have finished generating them
+      await LiveSegmentShaStore.Instance.addSegmentSha(this.videoUUID, previousSegment)
+
+      if (this.saveReplay) {
+        await this.addSegmentToReplay(hlsVideoPath, previousSegment)
+      }
+    }).catch(err => logger.error('Cannot process segments in %s', hlsVideoPath, { err, ...this.lTags }))
+  }
+
+  private hasClientSocketInBadHealth (sessionId: string) {
+    const rtmpSession = this.context.sessions.get(sessionId)
+
+    if (!rtmpSession) {
+      logger.warn('Cannot get session %s to check players socket health.', sessionId, this.lTags)
+      return
+    }
+
+    for (const playerSessionId of rtmpSession.players) {
+      const playerSession = this.context.sessions.get(playerSessionId)
+
+      if (!playerSession) {
+        logger.error('Cannot get player session %s to check socket health.', playerSession, this.lTags)
+        continue
+      }
+
+      if (playerSession.socket.writableLength > VIDEO_LIVE.MAX_SOCKET_WAITING_DATA) {
+        return true
+      }
+    }
+
+    return false
+  }
+
+  private async addSegmentToReplay (hlsVideoPath: string, segmentPath: string) {
+    const segmentName = basename(segmentPath)
+    const dest = join(hlsVideoPath, VIDEO_LIVE.REPLAY_DIRECTORY, buildConcatenatedName(segmentName))
+
+    try {
+      const data = await readFile(segmentPath)
+
+      await appendFile(dest, data)
+    } catch (err) {
+      logger.error('Cannot copy segment %s to replay directory.', segmentPath, { err, ...this.lTags })
+    }
+  }
+}
+
+// ---------------------------------------------------------------------------
+
+export {
+  MuxingSession
+}