server/lib/hls.ts

   1 import { basename, dirname, join } from 'path'
   2 import { HLS_STREAMING_PLAYLIST_DIRECTORY, P2P_MEDIA_LOADER_PEER_VERSION } from '../initializers/constants'
   3 import { close, ensureDir, move, open, outputJSON, pathExists, read, readFile, remove, writeFile } from 'fs-extra'
   4 import { getVideoFileSize } from '../helpers/ffmpeg-utils'
   5 import { sha256 } from '../helpers/core-utils'
   6 import { VideoStreamingPlaylistModel } from '../models/video/video-streaming-playlist'
   7 import { logger } from '../helpers/logger'
   8 import { doRequest, doRequestAndSaveToFile } from '../helpers/requests'
   9 import { generateRandomString } from '../helpers/utils'
  10 import { flatten, uniq } from 'lodash'
  11 import { VideoFileModel } from '../models/video/video-file'
  12 import { CONFIG } from '../initializers/config'
  13 import { sequelizeTypescript } from '../initializers/database'
  14 import { MVideoWithFile } from '@server/typings/models'
  15
  16 async function updateStreamingPlaylistsInfohashesIfNeeded () {
  17   const playlistsToUpdate = await VideoStreamingPlaylistModel.listByIncorrectPeerVersion()
  18
  19   // Use separate SQL queries, because we could have many videos to update
  20   for (const playlist of playlistsToUpdate) {
  21     await sequelizeTypescript.transaction(async t => {
  22       const videoFiles = await VideoFileModel.listByStreamingPlaylist(playlist.id, t)
  23
  24       playlist.p2pMediaLoaderInfohashes = VideoStreamingPlaylistModel.buildP2PMediaLoaderInfoHashes(playlist.playlistUrl, videoFiles)
  25       playlist.p2pMediaLoaderPeerVersion = P2P_MEDIA_LOADER_PEER_VERSION
  26       await playlist.save({ transaction: t })
  27     })
  28   }
  29 }
  30
  31 async function updateMasterHLSPlaylist (video: MVideoWithFile) {
  32   const directory = join(HLS_STREAMING_PLAYLIST_DIRECTORY, video.uuid)
  33   const masterPlaylists: string[] = [ '#EXTM3U', '#EXT-X-VERSION:3' ]
  34   const masterPlaylistPath = join(directory, VideoStreamingPlaylistModel.getMasterHlsPlaylistFilename())
  35
  36   for (const file of video.VideoFiles) {
  37     // If we did not generated a playlist for this resolution, skip
  38     const filePlaylistPath = join(directory, VideoStreamingPlaylistModel.getHlsPlaylistFilename(file.resolution))
  39     if (await pathExists(filePlaylistPath) === false) continue
  40
  41     const videoFilePath = video.getVideoFilePath(file)
  42
  43     const size = await getVideoFileSize(videoFilePath)
  44
  45     const bandwidth = 'BANDWIDTH=' + video.getBandwidthBits(file)
  46     const resolution = `RESOLUTION=${size.width}x${size.height}`
  47
  48     let line = `#EXT-X-STREAM-INF:${bandwidth},${resolution}`
  49     if (file.fps) line += ',FRAME-RATE=' + file.fps
  50
  51     masterPlaylists.push(line)
  52     masterPlaylists.push(VideoStreamingPlaylistModel.getHlsPlaylistFilename(file.resolution))
  53   }
  54
  55   await writeFile(masterPlaylistPath, masterPlaylists.join('\n') + '\n')
  56 }
  57
  58 async function updateSha256Segments (video: MVideoWithFile) {
  59   const json: { [filename: string]: { [range: string]: string } } = {}
  60
  61   const playlistDirectory = join(HLS_STREAMING_PLAYLIST_DIRECTORY, video.uuid)
  62
  63   // For all the resolutions available for this video
  64   for (const file of video.VideoFiles) {
  65     const rangeHashes: { [range: string]: string } = {}
  66
  67     const videoPath = join(playlistDirectory, VideoStreamingPlaylistModel.getHlsVideoName(video.uuid, file.resolution))
  68     const playlistPath = join(playlistDirectory, VideoStreamingPlaylistModel.getHlsPlaylistFilename(file.resolution))
  69
  70     // Maybe the playlist is not generated for this resolution yet
  71     if (!await pathExists(playlistPath)) continue
  72
  73     const playlistContent = await readFile(playlistPath)
  74     const ranges = getRangesFromPlaylist(playlistContent.toString())
  75
  76     const fd = await open(videoPath, 'r')
  77     for (const range of ranges) {
  78       const buf = Buffer.alloc(range.length)
  79       await read(fd, buf, 0, range.length, range.offset)
  80
  81       rangeHashes[`${range.offset}-${range.offset + range.length - 1}`] = sha256(buf)
  82     }
  83     await close(fd)
  84
  85     const videoFilename = VideoStreamingPlaylistModel.getHlsVideoName(video.uuid, file.resolution)
  86     json[videoFilename] = rangeHashes
  87   }
  88
  89   const outputPath = join(playlistDirectory, VideoStreamingPlaylistModel.getHlsSha256SegmentsFilename())
  90   await outputJSON(outputPath, json)
  91 }
  92
  93 function getRangesFromPlaylist (playlistContent: string) {
  94   const ranges: { offset: number, length: number }[] = []
  95   const lines = playlistContent.split('\n')
  96   const regex = /^#EXT-X-BYTERANGE:(\d+)@(\d+)$/
  97
  98   for (const line of lines) {
  99     const captured = regex.exec(line)
 100
 101     if (captured) {
 102       ranges.push({ length: parseInt(captured[1], 10), offset: parseInt(captured[2], 10) })
 103     }
 104   }
 105
 106   return ranges
 107 }
 108
 109 function downloadPlaylistSegments (playlistUrl: string, destinationDir: string, timeout: number) {
 110   let timer
 111
 112   logger.info('Importing HLS playlist %s', playlistUrl)
 113
 114   return new Promise<string>(async (res, rej) => {
 115     const tmpDirectory = join(CONFIG.STORAGE.TMP_DIR, await generateRandomString(10))
 116
 117     await ensureDir(tmpDirectory)
 118
 119     timer = setTimeout(() => {
 120       deleteTmpDirectory(tmpDirectory)
 121
 122       return rej(new Error('HLS download timeout.'))
 123     }, timeout)
 124
 125     try {
 126       // Fetch master playlist
 127       const subPlaylistUrls = await fetchUniqUrls(playlistUrl)
 128
 129       const subRequests = subPlaylistUrls.map(u => fetchUniqUrls(u))
 130       const fileUrls = uniq(flatten(await Promise.all(subRequests)))
 131
 132       logger.debug('Will download %d HLS files.', fileUrls.length, { fileUrls })
 133
 134       for (const fileUrl of fileUrls) {
 135         const destPath = join(tmpDirectory, basename(fileUrl))
 136
 137         const bodyKBLimit = 10 * 1000 * 1000 // 10GB
 138         await doRequestAndSaveToFile({ uri: fileUrl }, destPath, bodyKBLimit)
 139       }
 140
 141       clearTimeout(timer)
 142
 143       await move(tmpDirectory, destinationDir, { overwrite: true })
 144
 145       return res()
 146     } catch (err) {
 147       deleteTmpDirectory(tmpDirectory)
 148
 149       return rej(err)
 150     }
 151   })
 152
 153   function deleteTmpDirectory (directory: string) {
 154     remove(directory)
 155       .catch(err => logger.error('Cannot delete path on HLS download error.', { err }))
 156   }
 157
 158   async function fetchUniqUrls (playlistUrl: string) {
 159     const { body } = await doRequest<string>({ uri: playlistUrl })
 160
 161     if (!body) return []
 162
 163     const urls = body.split('\n')
 164       .filter(line => line.endsWith('.m3u8') || line.endsWith('.mp4'))
 165       .map(url => {
 166         if (url.startsWith('http://') || url.startsWith('https://')) return url
 167
 168         return `${dirname(playlistUrl)}/${url}`
 169       })
 170
 171     return uniq(urls)
 172   }
 173 }
 174
 175 // ---------------------------------------------------------------------------
 176
 177 export {
 178   updateMasterHLSPlaylist,
 179   updateSha256Segments,
 180   downloadPlaylistSegments,
 181   updateStreamingPlaylistsInfohashesIfNeeded
 182 }
 183
 184 // ---------------------------------------------------------------------------