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

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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[]
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private readonly bitrate: number
private readonly ratio: number
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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
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bitrate: number
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ratio: number
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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
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this.bitrate = options.bitrate
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this.ratio = options.bitrate
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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,
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outPath,
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masterPlaylistName: this.streamingPlaylist.playlistFilename,
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resolutions: this.allResolutions,
fps: this.fps,
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bitrate: this.bitrate,
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ratio: this.ratio,
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availableEncoders: VideoTranscodingProfilesManager.Instance.getAvailableEncoders(),
profile: CONFIG.LIVE.TRANSCODING.PROFILE
})
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: getLiveMuxingCommand(this.rtmpUrl, outPath, this.streamingPlaylist.playlistFilename)
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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 () {
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if (!this.ffmpegCommand) return
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this.ffmpegCommand.kill('SIGINT')
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}
destroy () {
this.removeAllListeners()
this.isAbleToUploadVideoWithCache.clear()
this.hasClientSocketInBadHealthWithCache.clear()
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}
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) {
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this.masterWatcher = chokidar.watch(outPath + '/' + this.streamingPlaylist.playlistFilename)
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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
}