71 lines
1.8 KiB
TypeScript
71 lines
1.8 KiB
TypeScript
import * as asyncLRU from 'async-lru'
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import { join } from 'path'
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import { createWriteStream } from 'fs'
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import { database as db, CONFIG, CACHE } from '../../initializers'
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import { logger, unlinkPromise, fetchRemoteVideoPreview } from '../../helpers'
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import { VideoInstance } from '../../models'
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class VideosPreviewCache {
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private static instance: VideosPreviewCache
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private lru
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private constructor () { }
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static get Instance () {
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return this.instance || (this.instance = new this())
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}
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init (max: number) {
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this.lru = new asyncLRU({
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max,
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load: (key, cb) => {
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this.loadPreviews(key)
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.then(res => cb(null, res))
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.catch(err => cb(err))
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}
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})
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this.lru.on('evict', (obj: { key: string, value: string }) => {
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unlinkPromise(obj.value).then(() => logger.debug('%s evicted from VideosPreviewCache', obj.value))
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})
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}
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getPreviewPath (key: string) {
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return new Promise<string>((res, rej) => {
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this.lru.get(key, (err, value) => {
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err ? rej(err) : res(value)
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})
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})
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}
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private async loadPreviews (key: string) {
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const video = await db.Video.loadByUUIDAndPopulateAccountAndServerAndTags(key)
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if (!video) return undefined
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if (video.isOwned()) return join(CONFIG.STORAGE.PREVIEWS_DIR, video.getPreviewName())
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const res = await this.saveRemotePreviewAndReturnPath(video)
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return res
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}
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private saveRemotePreviewAndReturnPath (video: VideoInstance) {
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const req = fetchRemoteVideoPreview(video)
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return new Promise<string>((res, rej) => {
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const path = join(CACHE.DIRECTORIES.PREVIEWS, video.getPreviewName())
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const stream = createWriteStream(path)
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req.pipe(stream)
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.on('finish', () => res(path))
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.on('error', (err) => rej(err))
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})
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}
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}
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export {
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VideosPreviewCache
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}
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