From c48e82b5e0478434de30626d14594a97f2402e7c Mon Sep 17 00:00:00 2001
From: Chocobozzz <me@florianbigard.com>
Date: Tue, 11 Sep 2018 16:27:07 +0200
Subject: Basic video redundancy implementation

---
 server/helpers/webtorrent.ts | 61 +++++++++++++++++++++++++++++++++-----------
 1 file changed, 46 insertions(+), 15 deletions(-)

(limited to 'server/helpers/webtorrent.ts')

diff --git a/server/helpers/webtorrent.ts b/server/helpers/webtorrent.ts
index 1c0cc7058..2fdfd1876 100644
--- a/server/helpers/webtorrent.ts
+++ b/server/helpers/webtorrent.ts
@@ -5,44 +5,49 @@ import { createWriteStream, remove } from 'fs-extra'
 import { CONFIG } from '../initializers'
 import { join } from 'path'
 
-function downloadWebTorrentVideo (target: { magnetUri: string, torrentName: string }) {
+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)
 
   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: CONFIG.STORAGE.VIDEOS_DIR }
     const torrent = webtorrent.add(torrentId, options, torrent => {
-      if (torrent.files.length !== 1) return rej(new Error('The number of files is not equal to 1 for ' + torrentId))
+      if (torrent.files.length !== 1) {
+        if (timer) clearTimeout(timer)
 
-      const file = torrent.files[ 0 ]
+        return safeWebtorrentDestroy(webtorrent, torrentId, file.name, target.torrentName)
+          .then(() => rej(new Error('The number of files is not equal to 1 for ' + torrentId)))
+      }
+
+      file = torrent.files[ 0 ]
 
       const writeStream = createWriteStream(path)
       writeStream.on('finish', () => {
-        webtorrent.destroy(async err => {
-          if (err) return rej(err)
-
-          if (target.torrentName) {
-            remove(torrentId)
-              .catch(err => logger.error('Cannot remove torrent %s in webtorrent download.', torrentId, { err }))
-          }
+        if (timer) clearTimeout(timer)
 
-          remove(join(CONFIG.STORAGE.VIDEOS_DIR, file.name))
-            .catch(err => logger.error('Cannot remove torrent file %s in webtorrent download.', file.name, { err }))
-
-          res(path)
-        })
+        return safeWebtorrentDestroy(webtorrent, torrentId, 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 ? file.name : undefined, target.torrentName)
+          .then(() => rej(new Error('Webtorrent download timeout.')))
+      }, timeout)
+    }
   })
 }
 
@@ -51,3 +56,29 @@ function downloadWebTorrentVideo (target: { magnetUri: string, torrentName: stri
 export {
   downloadWebTorrentVideo
 }
+
+// ---------------------------------------------------------------------------
+
+function safeWebtorrentDestroy (webtorrent: WebTorrent.Instance, torrentId: string, filename?: 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 (filename) {
+        remove(join(CONFIG.STORAGE.VIDEOS_DIR, filename))
+          .catch(err => logger.error('Cannot remove torrent file %s in webtorrent download.', filename, { err }))
+      }
+
+      if (err) {
+        logger.warn('Cannot destroy webtorrent in timeout.', { err })
+      }
+
+      return res()
+    })
+  })
+}
-- 
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