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import { logger } from './logger'
import { generateVideoTmpPath } from './utils'
import * as WebTorrent from 'webtorrent'
import { createWriteStream, ensureDir, remove } from 'fs-extra'
import { CONFIG } from '../initializers'
import { join } from 'path'
async function downloadWebTorrentVideo (target: { magnetUri: string, torrentName?: string }, timeout?: number) {
const id = target.magnetUri || target.torrentName
let timer
const path = generateVideoTmpPath(id)
logger.info('Importing torrent video %s', id)
const directoryPath = join(CONFIG.STORAGE.VIDEOS_DIR, 'import')
await ensureDir(directoryPath)
return new Promise<string>((res, rej) => {
const webtorrent = new WebTorrent()
let file: WebTorrent.TorrentFile
const torrentId = target.magnetUri || join(CONFIG.STORAGE.TORRENTS_DIR, target.torrentName)
const options = { path: directoryPath }
const torrent = webtorrent.add(torrentId, options, torrent => {
if (torrent.files.length !== 1) {
if (timer) clearTimeout(timer)
return safeWebtorrentDestroy(webtorrent, torrentId, join(directoryPath, file.name), target.torrentName)
.then(() => rej(new Error('Cannot import torrent ' + torrentId + ': there are multiple files in it')))
}
file = torrent.files[ 0 ]
// FIXME: avoid creating another stream when https://github.com/webtorrent/webtorrent/issues/1517 is fixed
const writeStream = createWriteStream(path)
writeStream.on('finish', () => {
if (timer) clearTimeout(timer)
return safeWebtorrentDestroy(webtorrent, torrentId, join(directoryPath, file.name), target.torrentName)
.then(() => res(path))
})
file.createReadStream().pipe(writeStream)
})
torrent.on('error', err => rej(err))
if (timeout) {
timer = setTimeout(async () => {
return safeWebtorrentDestroy(webtorrent, torrentId, file ? join(directoryPath, file.name) : undefined, target.torrentName)
.then(() => rej(new Error('Webtorrent download timeout.')))
}, timeout)
}
})
}
// ---------------------------------------------------------------------------
export {
downloadWebTorrentVideo
}
// ---------------------------------------------------------------------------
function safeWebtorrentDestroy (webtorrent: WebTorrent.Instance, torrentId: string, filepath?: string, torrentName?: string) {
return new Promise(res => {
webtorrent.destroy(err => {
// Delete torrent file
if (torrentName) {
remove(torrentId)
.catch(err => logger.error('Cannot remove torrent %s in webtorrent download.', torrentId, { err }))
}
// Delete downloaded file
if (filepath) {
remove(filepath)
.catch(err => logger.error('Cannot remove torrent file %s in webtorrent download.', filepath, { err }))
}
if (err) {
logger.warn('Cannot destroy webtorrent in timeout.', { err })
}
return res()
})
})
}
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