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 { 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 { getTorrentFileName, getVideoFilePath } from '@server/lib/video-paths'
  17 import { extractVideo } from '@server/helpers/video'
  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 (const 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         safeWebtorrentDestroy(webtorrent, torrentId, { directoryPath, filepath: file.path }, target.torrentName)
  58           .then(() => res(path))
  59           .catch(err => logger.error('Cannot destroy webtorrent.', { err }))
  60       })
  61
  62       file.createReadStream().pipe(writeStream)
  63     })
  64
  65     torrent.on('error', err => rej(err))
  66
  67     timer = setTimeout(() => {
  68       const err = new Error('Webtorrent download timeout.')
  69
  70       safeWebtorrentDestroy(webtorrent, torrentId, file ? { directoryPath, filepath: file.path } : undefined, target.torrentName)
  71         .then(() => rej(err))
  72         .catch(destroyErr => {
  73           logger.error('Cannot destroy webtorrent.', { err: destroyErr })
  74           rej(err)
  75         })
  76
  77     }, timeout)
  78   })
  79 }
  80
  81 async function createTorrentAndSetInfoHash (videoOrPlaylist: MVideo | MStreamingPlaylistVideo, videoFile: MVideoFile) {
  82   const video = extractVideo(videoOrPlaylist)
  83   const { baseUrlHttp } = video.getBaseUrls()
  84
  85   const options = {
  86     // Keep the extname, it's used by the client to stream the file inside a web browser
  87     name: `${video.name} ${videoFile.resolution}p${videoFile.extname}`,
  88     createdBy: 'PeerTube',
  89     announceList: [
  90       [ WEBSERVER.WS + '://' + WEBSERVER.HOSTNAME + ':' + WEBSERVER.PORT + '/tracker/socket' ],
  91       [ WEBSERVER.URL + '/tracker/announce' ]
  92     ],
  93     urlList: [ videoOrPlaylist.getVideoFileUrl(videoFile, baseUrlHttp) ]
  94   }
  95
  96   const torrent = await createTorrentPromise(getVideoFilePath(videoOrPlaylist, videoFile), options)
  97
  98   const filePath = join(CONFIG.STORAGE.TORRENTS_DIR, getTorrentFileName(videoOrPlaylist, videoFile))
  99   logger.info('Creating torrent %s.', filePath)
 100
 101   await writeFile(filePath, torrent)
 102
 103   const parsedTorrent = parseTorrent(torrent)
 104   videoFile.infoHash = parsedTorrent.infoHash
 105 }
 106
 107 function generateMagnetUri (
 108   videoOrPlaylist: MVideo | MStreamingPlaylistVideo,
 109   videoFile: MVideoFileRedundanciesOpt,
 110   baseUrlHttp: string,
 111   baseUrlWs: string
 112 ) {
 113   const video = isStreamingPlaylist(videoOrPlaylist)
 114     ? videoOrPlaylist.Video
 115     : videoOrPlaylist
 116
 117   const xs = videoOrPlaylist.getTorrentUrl(videoFile, baseUrlHttp)
 118   const announce = videoOrPlaylist.getTrackerUrls(baseUrlHttp, baseUrlWs)
 119   let urlList = [ videoOrPlaylist.getVideoFileUrl(videoFile, baseUrlHttp) ]
 120
 121   const redundancies = videoFile.RedundancyVideos
 122   if (isArray(redundancies)) urlList = urlList.concat(redundancies.map(r => r.fileUrl))
 123
 124   const magnetHash = {
 125     xs,
 126     announce,
 127     urlList,
 128     infoHash: videoFile.infoHash,
 129     name: video.name
 130   }
 131
 132   return magnetUtil.encode(magnetHash)
 133 }
 134
 135 // ---------------------------------------------------------------------------
 136
 137 export {
 138   createTorrentPromise,
 139   createTorrentAndSetInfoHash,
 140   generateMagnetUri,
 141   downloadWebTorrentVideo
 142 }
 143
 144 // ---------------------------------------------------------------------------
 145
 146 function safeWebtorrentDestroy (
 147   webtorrent: WebTorrent.Instance,
 148   torrentId: string,
 149   downloadedFile?: { directoryPath: string, filepath: string },
 150   torrentName?: string
 151 ) {
 152   return new Promise(res => {
 153     webtorrent.destroy(err => {
 154       // Delete torrent file
 155       if (torrentName) {
 156         logger.debug('Removing %s torrent after webtorrent download.', torrentId)
 157         remove(torrentId)
 158           .catch(err => logger.error('Cannot remove torrent %s in webtorrent download.', torrentId, { err }))
 159       }
 160
 161       // Delete downloaded file
 162       if (downloadedFile) deleteDownloadedFile(downloadedFile)
 163
 164       if (err) logger.warn('Cannot destroy webtorrent in timeout.', { err })
 165
 166       return res()
 167     })
 168   })
 169 }
 170
 171 function deleteDownloadedFile (downloadedFile: { directoryPath: string, filepath: string }) {
 172   // We want to delete the base directory
 173   let pathToDelete = dirname(downloadedFile.filepath)
 174   if (pathToDelete === '.') pathToDelete = downloadedFile.filepath
 175
 176   const toRemovePath = join(downloadedFile.directoryPath, pathToDelete)
 177
 178   logger.debug('Removing %s after webtorrent download.', toRemovePath)
 179   remove(toRemovePath)
 180     .catch(err => logger.error('Cannot remove torrent file %s in webtorrent download.', toRemovePath, { err }))
 181 }