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 } from 'fs-extra'
   5 import { CONFIG } from '../initializers'
   6 import { dirname, join } from 'path'
   7
   8 async function downloadWebTorrentVideo (target: { magnetUri: string, torrentName?: string }, timeout: number) {
   9   const id = target.magnetUri || target.torrentName
  10   let timer
  11
  12   const path = generateVideoImportTmpPath(id)
  13   logger.info('Importing torrent video %s', id)
  14
  15   const directoryPath = join(CONFIG.STORAGE.TMP_DIR, 'webtorrent')
  16   await ensureDir(directoryPath)
  17
  18   return new Promise<string>((res, rej) => {
  19     const webtorrent = new WebTorrent()
  20     let file: WebTorrent.TorrentFile
  21
  22     const torrentId = target.magnetUri || join(CONFIG.STORAGE.TORRENTS_DIR, target.torrentName)
  23
  24     const options = { path: directoryPath }
  25     const torrent = webtorrent.add(torrentId, options, torrent => {
  26       if (torrent.files.length !== 1) {
  27         if (timer) clearTimeout(timer)
  28
  29         for (let file of torrent.files) {
  30           deleteDownloadedFile({ directoryPath, filepath: file.path })
  31         }
  32
  33         return safeWebtorrentDestroy(webtorrent, torrentId, undefined, target.torrentName)
  34           .then(() => rej(new Error('Cannot import torrent ' + torrentId + ': there are multiple files in it')))
  35       }
  36
  37       file = torrent.files[ 0 ]
  38
  39       // FIXME: avoid creating another stream when https://github.com/webtorrent/webtorrent/issues/1517 is fixed
  40       const writeStream = createWriteStream(path)
  41       writeStream.on('finish', () => {
  42         if (timer) clearTimeout(timer)
  43
  44         return safeWebtorrentDestroy(webtorrent, torrentId, { directoryPath, filepath: file.path }, target.torrentName)
  45           .then(() => res(path))
  46       })
  47
  48       file.createReadStream().pipe(writeStream)
  49     })
  50
  51     torrent.on('error', err => rej(err))
  52
  53     timer = setTimeout(async () => {
  54       return safeWebtorrentDestroy(webtorrent, torrentId, file ? { directoryPath, filepath: file.path } : undefined, target.torrentName)
  55         .then(() => rej(new Error('Webtorrent download timeout.')))
  56     }, timeout)
  57   })
  58 }
  59
  60 // ---------------------------------------------------------------------------
  61
  62 export {
  63   downloadWebTorrentVideo
  64 }
  65
  66 // ---------------------------------------------------------------------------
  67
  68 function safeWebtorrentDestroy (
  69   webtorrent: WebTorrent.Instance,
  70   torrentId: string,
  71   downloadedFile?: { directoryPath: string, filepath: string },
  72   torrentName?: string
  73 ) {
  74   return new Promise(res => {
  75     webtorrent.destroy(err => {
  76       // Delete torrent file
  77       if (torrentName) {
  78         logger.debug('Removing %s torrent after webtorrent download.', torrentId)
  79         remove(torrentId)
  80           .catch(err => logger.error('Cannot remove torrent %s in webtorrent download.', torrentId, { err }))
  81       }
  82
  83       // Delete downloaded file
  84       if (downloadedFile) deleteDownloadedFile(downloadedFile)
  85
  86       if (err) logger.warn('Cannot destroy webtorrent in timeout.', { err })
  87
  88       return res()
  89     })
  90   })
  91 }
  92
  93 function deleteDownloadedFile (downloadedFile: { directoryPath: string, filepath: string }) {
  94   // We want to delete the base directory
  95   let pathToDelete = dirname(downloadedFile.filepath)
  96   if (pathToDelete === '.') pathToDelete = downloadedFile.filepath
  97
  98   const toRemovePath = join(downloadedFile.directoryPath, pathToDelete)
  99
 100   logger.debug('Removing %s after webtorrent download.', toRemovePath)
 101   remove(toRemovePath)
 102     .catch(err => logger.error('Cannot remove torrent file %s in webtorrent download.', toRemovePath, { err }))
 103 }