Support lazy download thumbnails

server/lib/files-cache/video-torrents-simple-file-cache.ts

@@ -0,0 +1,70 @@
+import { join } from 'path'
+import { logger } from '@server/helpers/logger'
+import { doRequestAndSaveToFile } from '@server/helpers/requests'
+import { VideoFileModel } from '@server/models/video/video-file'
+import { MVideo, MVideoFile } from '@server/types/models'
+import { CONFIG } from '../../initializers/config'
+import { FILES_CACHE } from '../../initializers/constants'
+import { VideoModel } from '../../models/video/video'
+import { AbstractSimpleFileCache } from './shared/abstract-simple-file-cache'
+
+class VideoTorrentsSimpleFileCache extends AbstractSimpleFileCache <string> {
+
+  private static instance: VideoTorrentsSimpleFileCache
+
+  private constructor () {
+    super()
+  }
+
+  static get Instance () {
+    return this.instance || (this.instance = new this())
+  }
+
+  async getFilePathImpl (filename: string) {
+    const file = await VideoFileModel.loadWithVideoOrPlaylistByTorrentFilename(filename)
+    if (!file) return undefined
+
+    if (file.getVideo().isOwned()) {
+      const downloadName = this.buildDownloadName(file.getVideo(), file)
+
+      return { isOwned: true, path: join(CONFIG.STORAGE.TORRENTS_DIR, file.torrentFilename), downloadName }
+    }
+
+    return this.loadRemoteFile(filename)
+  }
+
+  // Key is the torrent filename
+  protected async loadRemoteFile (key: string) {
+    const file = await VideoFileModel.loadWithVideoOrPlaylistByTorrentFilename(key)
+    if (!file) return undefined
+
+    if (file.getVideo().isOwned()) throw new Error('Cannot load remote file of owned video.')
+
+    // Used to fetch the path
+    const video = await VideoModel.loadFull(file.getVideo().id)
+    if (!video) return undefined
+
+    const remoteUrl = file.getRemoteTorrentUrl(video)
+    const destPath = join(FILES_CACHE.TORRENTS.DIRECTORY, file.torrentFilename)
+
+    try {
+      await doRequestAndSaveToFile(remoteUrl, destPath)
+
+      const downloadName = this.buildDownloadName(video, file)
+
+      return { isOwned: false, path: destPath, downloadName }
+    } catch (err) {
+      logger.info('Cannot fetch remote torrent file %s.', remoteUrl, { err })
+
+      return undefined
+    }
+  }
+
+  private buildDownloadName (video: MVideo, file: MVideoFile) {
+    return `${video.name}-${file.resolution}p.torrent`
+  }
+}
+
+export {
+  VideoTorrentsSimpleFileCache
+}