From 40e87e9ecc54e3513fb586928330a7855eb192c6 Mon Sep 17 00:00:00 2001
From: Chocobozzz <me@florianbigard.com>
Date: Thu, 12 Jul 2018 19:02:00 +0200
Subject: Implement captions/subtitles

---
 server/lib/cache/videos-preview-cache.ts | 60 ++++++++------------------------
 1 file changed, 14 insertions(+), 46 deletions(-)

(limited to 'server/lib/cache/videos-preview-cache.ts')

diff --git a/server/lib/cache/videos-preview-cache.ts b/server/lib/cache/videos-preview-cache.ts
index d09d55e11..1c0e7ed9d 100644
--- a/server/lib/cache/videos-preview-cache.ts
+++ b/server/lib/cache/videos-preview-cache.ts
@@ -1,71 +1,39 @@
-import * as asyncLRU from 'async-lru'
-import { createWriteStream } from 'fs'
 import { join } from 'path'
-import { unlinkPromise } from '../../helpers/core-utils'
-import { logger } from '../../helpers/logger'
-import { CACHE, CONFIG } from '../../initializers'
+import { CACHE, CONFIG, STATIC_PATHS } from '../../initializers'
 import { VideoModel } from '../../models/video/video'
-import { fetchRemoteVideoPreview } from '../activitypub'
+import { AbstractVideoStaticFileCache } from './abstract-video-static-file-cache'
 
-class VideosPreviewCache {
+class VideosPreviewCache extends AbstractVideoStaticFileCache <string> {
 
   private static instance: VideosPreviewCache
 
-  private lru
-
-  private constructor () { }
+  private constructor () {
+    super()
+  }
 
   static get Instance () {
     return this.instance || (this.instance = new this())
   }
 
-  init (max: number) {
-    this.lru = new asyncLRU({
-      max,
-      load: (key, cb) => {
-        this.loadPreviews(key)
-          .then(res => cb(null, res))
-          .catch(err => cb(err))
-      }
-    })
-
-    this.lru.on('evict', (obj: { key: string, value: string }) => {
-      unlinkPromise(obj.value).then(() => logger.debug('%s evicted from VideosPreviewCache', obj.value))
-    })
-  }
-
-  async getPreviewPath (key: string) {
-    const video = await VideoModel.loadByUUID(key)
+  async getFilePath (videoUUID: string) {
+    const video = await VideoModel.loadByUUID(videoUUID)
     if (!video) return undefined
 
     if (video.isOwned()) return join(CONFIG.STORAGE.PREVIEWS_DIR, video.getPreviewName())
 
-    return new Promise<string>((res, rej) => {
-      this.lru.get(key, (err, value) => {
-        err ? rej(err) : res(value)
-      })
-    })
+    return this.loadFromLRU(videoUUID)
   }
 
-  private async loadPreviews (key: string) {
+  protected async loadRemoteFile (key: string) {
     const video = await VideoModel.loadByUUIDAndPopulateAccountAndServerAndTags(key)
     if (!video) return undefined
 
-    if (video.isOwned()) throw new Error('Cannot load preview of owned video.')
-
-    return this.saveRemotePreviewAndReturnPath(video)
-  }
+    if (video.isOwned()) throw new Error('Cannot load remote preview of owned video.')
 
-  private saveRemotePreviewAndReturnPath (video: VideoModel) {
-    return new Promise<string>((res, rej) => {
-      const req = fetchRemoteVideoPreview(video, rej)
-      const path = join(CACHE.DIRECTORIES.PREVIEWS, video.getPreviewName())
-      const stream = createWriteStream(path)
+    const remoteStaticPath = join(STATIC_PATHS.PREVIEWS, video.getPreviewName())
+    const destPath = join(CACHE.DIRECTORIES.PREVIEWS, video.getPreviewName())
 
-      req.pipe(stream)
-        .on('error', (err) => rej(err))
-        .on('finish', () => res(path))
-    })
+    return this.saveRemoteVideoFileAndReturnPath(video, remoteStaticPath, destPath)
   }
 }
 
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