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import * as AsyncLRU from 'async-lru'
import { createWriteStream } from 'fs'
import { unlinkPromise } from '../../helpers/core-utils'
import { logger } from '../../helpers/logger'
import { VideoModel } from '../../models/video/video'
import { fetchRemoteVideoStaticFile } from '../activitypub'
export abstract class AbstractVideoStaticFileCache <T> {
protected lru
abstract getFilePath (params: T): Promise<string>
// Load and save the remote file, then return the local path from filesystem
protected abstract loadRemoteFile (key: string): Promise<string>
init (max: number, maxAge: number) {
this.lru = new AsyncLRU({
max,
maxAge,
load: (key, cb) => {
this.loadRemoteFile(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 %s', obj.value, this.constructor.name))
})
}
protected loadFromLRU (key: string) {
return new Promise<string>((res, rej) => {
this.lru.get(key, (err, value) => {
err ? rej(err) : res(value)
})
})
}
protected saveRemoteVideoFileAndReturnPath (video: VideoModel, remoteStaticPath: string, destPath: string) {
return new Promise<string>((res, rej) => {
const req = fetchRemoteVideoStaticFile(video, remoteStaticPath, rej)
const stream = createWriteStream(destPath)
req.pipe(stream)
.on('error', (err) => rej(err))
.on('finish', () => res(destPath))
})
}
}
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