server/helpers/webtorrent.ts

   1 import { decode, encode } from 'bencode'
   2 import createTorrent from 'create-torrent'
   3 import { createWriteStream, ensureDir, readFile, remove, writeFile } from 'fs-extra'
   4 import magnetUtil from 'magnet-uri'
   5 import parseTorrent from 'parse-torrent'
   6 import { dirname, join } from 'path'
   7 import { pipeline } from 'stream'
   8 import WebTorrent, { Instance, TorrentFile } from 'webtorrent'
   9 import { isArray } from '@server/helpers/custom-validators/misc'
  10 import { WEBSERVER } from '@server/initializers/constants'
  11 import { generateTorrentFileName } from '@server/lib/paths'
  12 import { VideoPathManager } from '@server/lib/video-path-manager'
  13 import { MVideo } from '@server/types/models/video/video'
  14 import { MVideoFile, MVideoFileRedundanciesOpt } from '@server/types/models/video/video-file'
  15 import { MStreamingPlaylistVideo } from '@server/types/models/video/video-streaming-playlist'
  16 import { CONFIG } from '../initializers/config'
  17 import { promisify2 } from './core-utils'
  18 import { logger } from './logger'
  19 import { generateVideoImportTmpPath } from './utils'
  20 import { extractVideo } from './video'
  21
  22 const createTorrentPromise = promisify2<string, any, any>(createTorrent)
  23
  24 async function downloadWebTorrentVideo (target: { uri: string, torrentName?: string }, timeout: number) {
  25   const id = target.uri || target.torrentName
  26   let timer
  27
  28   const path = generateVideoImportTmpPath(id)
  29   logger.info('Importing torrent video %s', id)
  30
  31   const directoryPath = join(CONFIG.STORAGE.TMP_DIR, 'webtorrent')
  32   await ensureDir(directoryPath)
  33
  34   return new Promise<string>((res, rej) => {
  35     const webtorrent = new WebTorrent()
  36     let file: TorrentFile
  37
  38     const torrentId = target.uri || join(CONFIG.STORAGE.TORRENTS_DIR, target.torrentName)
  39
  40     const options = { path: directoryPath }
  41     const torrent = webtorrent.add(torrentId, options, torrent => {
  42       if (torrent.files.length !== 1) {
  43         if (timer) clearTimeout(timer)
  44
  45         for (const file of torrent.files) {
  46           deleteDownloadedFile({ directoryPath, filepath: file.path })
  47         }
  48
  49         return safeWebtorrentDestroy(webtorrent, torrentId, undefined, target.torrentName)
  50           .then(() => rej(new Error('Cannot import torrent ' + torrentId + ': there are multiple files in it')))
  51       }
  52
  53       logger.debug('Got torrent from webtorrent %s.', id, { infoHash: torrent.infoHash })
  54
  55       file = torrent.files[0]
  56
  57       // FIXME: avoid creating another stream when https://github.com/webtorrent/webtorrent/issues/1517 is fixed
  58       const writeStream = createWriteStream(path)
  59       writeStream.on('finish', () => {
  60         if (timer) clearTimeout(timer)
  61
  62         safeWebtorrentDestroy(webtorrent, torrentId, { directoryPath, filepath: file.path }, target.torrentName)
  63           .then(() => res(path))
  64           .catch(err => logger.error('Cannot destroy webtorrent.', { err }))
  65       })
  66
  67       pipeline(
  68         file.createReadStream(),
  69         writeStream,
  70         err => {
  71           if (err) rej(err)
  72         }
  73       )
  74     })
  75
  76     torrent.on('error', err => rej(err))
  77
  78     timer = setTimeout(() => {
  79       const err = new Error('Webtorrent download timeout.')
  80
  81       safeWebtorrentDestroy(webtorrent, torrentId, file ? { directoryPath, filepath: file.path } : undefined, target.torrentName)
  82         .then(() => rej(err))
  83         .catch(destroyErr => {
  84           logger.error('Cannot destroy webtorrent.', { err: destroyErr })
  85           rej(err)
  86         })
  87
  88     }, timeout)
  89   })
  90 }
  91
  92 function createTorrentAndSetInfoHash (videoOrPlaylist: MVideo | MStreamingPlaylistVideo, videoFile: MVideoFile) {
  93   const video = extractVideo(videoOrPlaylist)
  94
  95   const options = {
  96     // Keep the extname, it's used by the client to stream the file inside a web browser
  97     name: `${video.name} ${videoFile.resolution}p${videoFile.extname}`,
  98     createdBy: 'PeerTube',
  99     announceList: buildAnnounceList(),
 100     urlList: buildUrlList(video, videoFile)
 101   }
 102
 103   return VideoPathManager.Instance.makeAvailableVideoFile(videoFile.withVideoOrPlaylist(videoOrPlaylist), async videoPath => {
 104     const torrentContent = await createTorrentPromise(videoPath, options)
 105
 106     const torrentFilename = generateTorrentFileName(videoOrPlaylist, videoFile.resolution)
 107     const torrentPath = join(CONFIG.STORAGE.TORRENTS_DIR, torrentFilename)
 108     logger.info('Creating torrent %s.', torrentPath)
 109
 110     await writeFile(torrentPath, torrentContent)
 111
 112     // Remove old torrent file if it existed
 113     if (videoFile.hasTorrent()) {
 114       await remove(join(CONFIG.STORAGE.TORRENTS_DIR, videoFile.torrentFilename))
 115     }
 116
 117     const parsedTorrent = parseTorrent(torrentContent)
 118     videoFile.infoHash = parsedTorrent.infoHash
 119     videoFile.torrentFilename = torrentFilename
 120   })
 121 }
 122
 123 async function updateTorrentUrls (videoOrPlaylist: MVideo | MStreamingPlaylistVideo, videoFile: MVideoFile) {
 124   const video = extractVideo(videoOrPlaylist)
 125
 126   const oldTorrentPath = join(CONFIG.STORAGE.TORRENTS_DIR, videoFile.torrentFilename)
 127
 128   const torrentContent = await readFile(oldTorrentPath)
 129   const decoded = decode(torrentContent)
 130
 131   decoded['announce-list'] = buildAnnounceList()
 132   decoded.announce = decoded['announce-list'][0][0]
 133
 134   decoded['url-list'] = buildUrlList(video, videoFile)
 135
 136   const newTorrentFilename = generateTorrentFileName(videoOrPlaylist, videoFile.resolution)
 137   const newTorrentPath = join(CONFIG.STORAGE.TORRENTS_DIR, newTorrentFilename)
 138
 139   logger.info('Updating torrent URLs %s -> %s.', oldTorrentPath, newTorrentPath)
 140
 141   await writeFile(newTorrentPath, encode(decoded))
 142   await remove(join(CONFIG.STORAGE.TORRENTS_DIR, videoFile.torrentFilename))
 143
 144   videoFile.torrentFilename = newTorrentFilename
 145 }
 146
 147 function generateMagnetUri (
 148   video: MVideo,
 149   videoFile: MVideoFileRedundanciesOpt,
 150   trackerUrls: string[]
 151 ) {
 152   const xs = videoFile.getTorrentUrl()
 153   const announce = trackerUrls
 154   let urlList = [ videoFile.getFileUrl(video) ]
 155
 156   const redundancies = videoFile.RedundancyVideos
 157   if (isArray(redundancies)) urlList = urlList.concat(redundancies.map(r => r.fileUrl))
 158
 159   const magnetHash = {
 160     xs,
 161     announce,
 162     urlList,
 163     infoHash: videoFile.infoHash,
 164     name: video.name
 165   }
 166
 167   return magnetUtil.encode(magnetHash)
 168 }
 169
 170 // ---------------------------------------------------------------------------
 171
 172 export {
 173   createTorrentPromise,
 174   updateTorrentUrls,
 175   createTorrentAndSetInfoHash,
 176   generateMagnetUri,
 177   downloadWebTorrentVideo
 178 }
 179
 180 // ---------------------------------------------------------------------------
 181
 182 function safeWebtorrentDestroy (
 183   webtorrent: Instance,
 184   torrentId: string,
 185   downloadedFile?: { directoryPath: string, filepath: string },
 186   torrentName?: string
 187 ) {
 188   return new Promise<void>(res => {
 189     webtorrent.destroy(err => {
 190       // Delete torrent file
 191       if (torrentName) {
 192         logger.debug('Removing %s torrent after webtorrent download.', torrentId)
 193         remove(torrentId)
 194           .catch(err => logger.error('Cannot remove torrent %s in webtorrent download.', torrentId, { err }))
 195       }
 196
 197       // Delete downloaded file
 198       if (downloadedFile) deleteDownloadedFile(downloadedFile)
 199
 200       if (err) logger.warn('Cannot destroy webtorrent in timeout.', { err })
 201
 202       return res()
 203     })
 204   })
 205 }
 206
 207 function deleteDownloadedFile (downloadedFile: { directoryPath: string, filepath: string }) {
 208   // We want to delete the base directory
 209   let pathToDelete = dirname(downloadedFile.filepath)
 210   if (pathToDelete === '.') pathToDelete = downloadedFile.filepath
 211
 212   const toRemovePath = join(downloadedFile.directoryPath, pathToDelete)
 213
 214   logger.debug('Removing %s after webtorrent download.', toRemovePath)
 215   remove(toRemovePath)
 216     .catch(err => logger.error('Cannot remove torrent file %s in webtorrent download.', toRemovePath, { err }))
 217 }
 218
 219 function buildAnnounceList () {
 220   return [
 221     [ WEBSERVER.WS + '://' + WEBSERVER.HOSTNAME + ':' + WEBSERVER.PORT + '/tracker/socket' ],
 222     [ WEBSERVER.URL + '/tracker/announce' ]
 223   ]
 224 }
 225
 226 function buildUrlList (video: MVideo, videoFile: MVideoFile) {
 227   return [ videoFile.getFileUrl(video) ]
 228 }