server/helpers/webtorrent.ts

   1 import { logger } from './logger'
   2 import { generateVideoImportTmpPath } from './utils'
   3 import * as WebTorrent from 'webtorrent'
   4 import { createWriteStream, ensureDir, remove, writeFile } from 'fs-extra'
   5 import { CONFIG } from '../initializers/config'
   6 import { dirname, join } from 'path'
   7 import * as createTorrent from 'create-torrent'
   8 import { promisify2 } from './core-utils'
   9 import { MVideo } from '@server/typings/models/video/video'
  10 import { MVideoFile, MVideoFileRedundanciesOpt } from '@server/typings/models/video/video-file'
  11 import { isStreamingPlaylist, MStreamingPlaylistVideo } from '@server/typings/models/video/video-streaming-playlist'
  12 import { STATIC_PATHS, WEBSERVER } from '@server/initializers/constants'
  13 import * as parseTorrent from 'parse-torrent'
  14 import * as magnetUtil from 'magnet-uri'
  15 import { isArray } from '@server/helpers/custom-validators/misc'
  16 import { extractVideo } from '@server/lib/videos'
  17 import { getTorrentFileName, getVideoFilename, getVideoFilePath } from '@server/lib/video-paths'
  18
  19 const createTorrentPromise = promisify2<string, any, any>(createTorrent)
  20
  21 async function downloadWebTorrentVideo (target: { magnetUri: string, torrentName?: string }, timeout: number) {
  22   const id = target.magnetUri || target.torrentName
  23   let timer
  24
  25   const path = generateVideoImportTmpPath(id)
  26   logger.info('Importing torrent video %s', id)
  27
  28   const directoryPath = join(CONFIG.STORAGE.TMP_DIR, 'webtorrent')
  29   await ensureDir(directoryPath)
  30
  31   return new Promise<string>((res, rej) => {
  32     const webtorrent = new WebTorrent()
  33     let file: WebTorrent.TorrentFile
  34
  35     const torrentId = target.magnetUri || join(CONFIG.STORAGE.TORRENTS_DIR, target.torrentName)
  36
  37     const options = { path: directoryPath }
  38     const torrent = webtorrent.add(torrentId, options, torrent => {
  39       if (torrent.files.length !== 1) {
  40         if (timer) clearTimeout(timer)
  41
  42         for (let file of torrent.files) {
  43           deleteDownloadedFile({ directoryPath, filepath: file.path })
  44         }
  45
  46         return safeWebtorrentDestroy(webtorrent, torrentId, undefined, target.torrentName)
  47           .then(() => rej(new Error('Cannot import torrent ' + torrentId + ': there are multiple files in it')))
  48       }
  49
  50       file = torrent.files[ 0 ]
  51
  52       // FIXME: avoid creating another stream when https://github.com/webtorrent/webtorrent/issues/1517 is fixed
  53       const writeStream = createWriteStream(path)
  54       writeStream.on('finish', () => {
  55         if (timer) clearTimeout(timer)
  56
  57         return safeWebtorrentDestroy(webtorrent, torrentId, { directoryPath, filepath: file.path }, target.torrentName)
  58           .then(() => res(path))
  59       })
  60
  61       file.createReadStream().pipe(writeStream)
  62     })
  63
  64     torrent.on('error', err => rej(err))
  65
  66     timer = setTimeout(async () => {
  67       return safeWebtorrentDestroy(webtorrent, torrentId, file ? { directoryPath, filepath: file.path } : undefined, target.torrentName)
  68         .then(() => rej(new Error('Webtorrent download timeout.')))
  69     }, timeout)
  70   })
  71 }
  72
  73 async function createTorrentAndSetInfoHash (videoOrPlaylist: MVideo | MStreamingPlaylistVideo, videoFile: MVideoFile) {
  74   const video = extractVideo(videoOrPlaylist)
  75
  76   const options = {
  77     // Keep the extname, it's used by the client to stream the file inside a web browser
  78     name: `${video.name} ${videoFile.resolution}p${videoFile.extname}`,
  79     createdBy: 'PeerTube',
  80     announceList: [
  81       [ WEBSERVER.WS + '://' + WEBSERVER.HOSTNAME + ':' + WEBSERVER.PORT + '/tracker/socket' ],
  82       [ WEBSERVER.URL + '/tracker/announce' ]
  83     ],
  84     urlList: [ WEBSERVER.URL + STATIC_PATHS.WEBSEED + getVideoFilename(videoOrPlaylist, videoFile) ]
  85   }
  86
  87   const torrent = await createTorrentPromise(getVideoFilePath(videoOrPlaylist, videoFile), options)
  88
  89   const filePath = join(CONFIG.STORAGE.TORRENTS_DIR, getTorrentFileName(videoOrPlaylist, videoFile))
  90   logger.info('Creating torrent %s.', filePath)
  91
  92   await writeFile(filePath, torrent)
  93
  94   const parsedTorrent = parseTorrent(torrent)
  95   videoFile.infoHash = parsedTorrent.infoHash
  96 }
  97
  98 function generateMagnetUri (
  99   videoOrPlaylist: MVideo | MStreamingPlaylistVideo,
 100   videoFile: MVideoFileRedundanciesOpt,
 101   baseUrlHttp: string,
 102   baseUrlWs: string
 103 ) {
 104   const video = isStreamingPlaylist(videoOrPlaylist)
 105     ? videoOrPlaylist.Video
 106     : videoOrPlaylist
 107
 108   const xs = videoOrPlaylist.getTorrentUrl(videoFile, baseUrlHttp)
 109   const announce = videoOrPlaylist.getTrackerUrls(baseUrlHttp, baseUrlWs)
 110   let urlList = [ videoOrPlaylist.getVideoFileUrl(videoFile, baseUrlHttp) ]
 111
 112   const redundancies = videoFile.RedundancyVideos
 113   if (isArray(redundancies)) urlList = urlList.concat(redundancies.map(r => r.fileUrl))
 114
 115   const magnetHash = {
 116     xs,
 117     announce,
 118     urlList,
 119     infoHash: videoFile.infoHash,
 120     name: video.name
 121   }
 122
 123   return magnetUtil.encode(magnetHash)
 124 }
 125
 126 // ---------------------------------------------------------------------------
 127
 128 export {
 129   createTorrentAndSetInfoHash,
 130   generateMagnetUri,
 131   downloadWebTorrentVideo
 132 }
 133
 134 // ---------------------------------------------------------------------------
 135
 136 function safeWebtorrentDestroy (
 137   webtorrent: WebTorrent.Instance,
 138   torrentId: string,
 139   downloadedFile?: { directoryPath: string, filepath: string },
 140   torrentName?: string
 141 ) {
 142   return new Promise(res => {
 143     webtorrent.destroy(err => {
 144       // Delete torrent file
 145       if (torrentName) {
 146         logger.debug('Removing %s torrent after webtorrent download.', torrentId)
 147         remove(torrentId)
 148           .catch(err => logger.error('Cannot remove torrent %s in webtorrent download.', torrentId, { err }))
 149       }
 150
 151       // Delete downloaded file
 152       if (downloadedFile) deleteDownloadedFile(downloadedFile)
 153
 154       if (err) logger.warn('Cannot destroy webtorrent in timeout.', { err })
 155
 156       return res()
 157     })
 158   })
 159 }
 160
 161 function deleteDownloadedFile (downloadedFile: { directoryPath: string, filepath: string }) {
 162   // We want to delete the base directory
 163   let pathToDelete = dirname(downloadedFile.filepath)
 164   if (pathToDelete === '.') pathToDelete = downloadedFile.filepath
 165
 166   const toRemovePath = join(downloadedFile.directoryPath, pathToDelete)
 167
 168   logger.debug('Removing %s after webtorrent download.', toRemovePath)
 169   remove(toRemovePath)
 170     .catch(err => logger.error('Cannot remove torrent file %s in webtorrent download.', toRemovePath, { err }))
 171 }