server/helpers/webtorrent.ts

   1 import { logger } from './logger'
   2 import { generateVideoTmpPath } from './utils'
   3 import * as WebTorrent from 'webtorrent'
   4 import { createWriteStream, remove } from 'fs-extra'
   5 import { CONFIG } from '../initializers'
   6 import { join } from 'path'
   7
   8 function downloadWebTorrentVideo (target: { magnetUri: string, torrentName?: string }, timeout?: number) {
   9   const id = target.magnetUri || target.torrentName
  10   let timer
  11
  12   const path = generateVideoTmpPath(id)
  13   logger.info('Importing torrent video %s', id)
  14
  15   return new Promise<string>((res, rej) => {
  16     const webtorrent = new WebTorrent()
  17     let file: WebTorrent.TorrentFile
  18
  19     const torrentId = target.magnetUri || join(CONFIG.STORAGE.TORRENTS_DIR, target.torrentName)
  20
  21     const options = { path: CONFIG.STORAGE.VIDEOS_DIR }
  22     const torrent = webtorrent.add(torrentId, options, torrent => {
  23       if (torrent.files.length !== 1) {
  24         if (timer) clearTimeout(timer)
  25
  26         return safeWebtorrentDestroy(webtorrent, torrentId, file.name, target.torrentName)
  27           .then(() => rej(new Error('Cannot import torrent ' + torrentId + ': there are multiple files in it')))
  28       }
  29
  30       file = torrent.files[ 0 ]
  31
  32       const writeStream = createWriteStream(path)
  33       writeStream.on('finish', () => {
  34         if (timer) clearTimeout(timer)
  35
  36         return safeWebtorrentDestroy(webtorrent, torrentId, file.name, target.torrentName)
  37           .then(() => res(path))
  38       })
  39
  40       file.createReadStream().pipe(writeStream)
  41     })
  42
  43     torrent.on('error', err => rej(err))
  44
  45     if (timeout) {
  46       timer = setTimeout(async () => {
  47         return safeWebtorrentDestroy(webtorrent, torrentId, file ? file.name : undefined, target.torrentName)
  48           .then(() => rej(new Error('Webtorrent download timeout.')))
  49       }, timeout)
  50     }
  51   })
  52 }
  53
  54 // ---------------------------------------------------------------------------
  55
  56 export {
  57   downloadWebTorrentVideo
  58 }
  59
  60 // ---------------------------------------------------------------------------
  61
  62 function safeWebtorrentDestroy (webtorrent: WebTorrent.Instance, torrentId: string, filename?: string, torrentName?: string) {
  63   return new Promise(res => {
  64     webtorrent.destroy(err => {
  65       // Delete torrent file
  66       if (torrentName) {
  67         remove(torrentId)
  68           .catch(err => logger.error('Cannot remove torrent %s in webtorrent download.', torrentId, { err }))
  69       }
  70
  71       // Delete downloaded file
  72       if (filename) {
  73         remove(join(CONFIG.STORAGE.VIDEOS_DIR, filename))
  74           .catch(err => logger.error('Cannot remove torrent file %s in webtorrent download.', filename, { err }))
  75       }
  76
  77       if (err) {
  78         logger.warn('Cannot destroy webtorrent in timeout.', { err })
  79       }
  80
  81       return res()
  82     })
  83   })
  84 }