90 lines
2.3 KiB
JavaScript
Executable File
90 lines
2.3 KiB
JavaScript
Executable File
const constants = require("../utils/constants")
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const cacheManager = require("./cache-manager")
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const cacheReaper = require("../background/cache-reaper")
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const lowQualityLimit = 480
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let dlQueues = []
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const isLowQuality = q => Number(q.split("p")[0]) <= lowQualityLimit
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class DlQueue {
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constructor() {
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this.lq = []
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this.hq = []
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this.downloadCount = 0 // Ticks up to 3 then downloads an HQ if available
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this.lastOutput = null
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this.updating = false
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}
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async enqueue(videoID, quality) {
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quality = quality ?? "360p"
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let fname = `${videoID}-${quality}`
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// Same download can't be started multiple times
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const existingData = cacheManager.read("download")[fname]
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if ((!existingData || existingData.status != 2) && !downloader.videoExists(fname)) {
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// Sets to queued
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cacheManager.write("download", fname, { status: 1 })
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// Adds to queue
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if (isLowQuality(quality))
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this.lq.push({videoID, quality})
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else
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this.hq.push({videoID, quality})
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if (!this.updating)
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this.update()
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}
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await downloader.waitForDownload(fname)
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return this.lastOutput
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}
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async startDownload(dl) {
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this.lastOutput = await downloader.saveMp4Android(dl.videoID, dl.quality)
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}
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update() {
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this.updating = true
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// Scan caches just before downloading
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cacheReaper.scanCaches()
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this.downloadCount++
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if (this.lq.length > 0 && (this.downloadCount < 3 || this.hq.length == 0))
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this.startDownload(this.lq.pop()).then(() => {
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this.updating = false
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this.update()
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})
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else if (this.hq.length > 0) {
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this.startDownload(this.hq.pop()).then(() => {
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this.updating = false
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this.update()
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})
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} else
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this.updating = false
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if (this.downloadCount == 3)
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this.downloadCount = 0
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}
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}
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for (let i = 0; i < constants.server_setup.download_queue_threads; i++)
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dlQueues.push(new DlQueue())
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async function enqueue(videoID, quality) {
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// Pick the first empty/near-empty download queue
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const isLQ = quality == undefined || isLowQuality(quality)
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let sortedQueues
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if (isLQ)
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sortedQueues = dlQueues.sort((a, b) => a.lq.length - b.lq.length)
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else
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sortedQueues = dlQueues.sort((a, b) => (a.hq.length + (2 - a.downloadCount)) - (b.hq.length + (2 - b.downloadCount)))
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return await sortedQueues[0].enqueue(videoID, quality)
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}
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module.exports = {
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enqueue
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}
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const downloader = require("./downloader")
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