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package server;
import js.lib.Promise;
import js.node.ChildProcess;
import js.node.Fs.Fs;
import js.node.stream.Readable;
import sys.FileSystem;
import utils.YoutubeUtils;
class Cache {
final main:Main;
final cacheDir:String;
public final cachedFiles:Array<String> = [];
public final isYtReady = false;
/** In bytes **/
public var storageLimit = 3 * 1024 * 1024 * 1024;
public function new(main:Main, cacheDir:String) {
this.main = main;
this.cacheDir = cacheDir;
Utils.ensureDir(cacheDir);
isYtReady = checkYtDeps();
}
function checkYtDeps():Bool {
final ytdl = try {
untyped require("@distube/ytdl-core");
} catch (e) {
return false;
}
try {
ChildProcess.execSync("ffmpeg -version", {stdio: "ignore", timeout: 3000});
return true;
} catch (e) {
return false;
}
}
function log(client:Client, msg:String):Void {
main.serverMessage(client, msg);
trace(msg);
}
public function cacheYoutubeVideo(client:Client, url:String, callback:(name:String) -> Void) {
if (!isYtReady) {
trace("Do `npm i @distube/ytdl-core@latest` to use cache feature (you also need to install `ffmpeg` to build mp4 from downloaded audio/video tracks).");
return;
}
final videoId = YoutubeUtils.extractVideoId(url);
if (videoId == "") {
log(client, 'Error: youtube video id not found in url: $url');
return;
}
final outName = videoId + ".mp4";
if (cachedFiles.contains(outName)) {
callback(outName);
return;
}
final ytdl:Dynamic = untyped require("@distube/ytdl-core");
log(client, 'Caching $url to $outName...');
final opts = {playerClients: ["IOS", "WEB_CREATOR"]};
final promise:Promise<YouTubeVideoInfo> = ytdl.getInfo(url, opts);
promise.then(info -> {
// trace(info.formats.filter(item -> item.audioCodec != null));
trace('Get info with ${info.formats.length} formats');
final audioFormat:YoutubeVideoFormat = try {
ytdl.chooseFormat(info.formats.filter(item -> {
return item.audioCodec?.startsWith("mp4a");
}), {quality: "highestaudio"});
} catch (e) {
log(client, "Error: audio format not found");
trace(e);
trace(info.formats);
return;
}
final videoFormat = getBestYoutubeVideoFormat(info.formats) ?? {
log(client, "Error: video format not found");
trace(info.formats);
return;
}
trace("Picked audio and video formats");
final dlVideo:Readable<Dynamic> = ytdl(url, {
format: videoFormat,
playerClients: opts.playerClients
});
dlVideo.pipe(Fs.createWriteStream('$cacheDir/input-video'));
dlVideo.on("error", err -> log(client, "Error during video download: " + err));
final dlAudio:Readable<Dynamic> = ytdl(url, {
format: audioFormat,
playerClients: opts.playerClients
});
dlAudio.pipe(Fs.createWriteStream('$cacheDir/input-audio'));
dlAudio.on("error", err -> log(client, "Error during audio download: " + err));
var count = 0;
function onComplete(type:String):Void {
count++;
log(client, '$type track downloaded ($count/2)');
if (count < 2) return;
final args = '-y -i input-video -i input-audio -c copy -map 0:v -map 1:a $outName'.split(" ");
final process = ChildProcess.spawn("ffmpeg", args, {
cwd: cacheDir,
stdio: "ignore"
});
process.on("close", (code:Int) -> {
if (code != 0) {
log(client, 'Error: ffmpeg closed with code $code');
return;
}
final inVideo = '$cacheDir/input-video';
final inAudio = '$cacheDir/input-audio';
if (FileSystem.exists(inVideo)) FileSystem.deleteFile(inVideo);
if (FileSystem.exists(inAudio)) FileSystem.deleteFile(inAudio);
cachedFiles.push(outName);
removeOlderCache();
callback(outName);
});
}
dlVideo.on("finish", () -> onComplete("Video"));
dlAudio.on("finish", () -> onComplete("Audio"));
// dlVideo.on('progress', (c, d, t) -> {
// final progress = Std.int((d / t * 100) * 10) / 10;
// trace(progress);
// });
}).catchError(err -> {
log(client, "" + err);
});
}
function removeOlderCache():Void {
while (getUsedSpace() > storageLimit) {
final name = cachedFiles.shift();
final path = '$cacheDir/$name';
if (FileSystem.exists(path)) FileSystem.deleteFile(path);
}
}
function getUsedSpace():Int {
var total = 0;
for (name in cachedFiles) {
final path = '$cacheDir/$name';
total += FileSystem.stat(path).size;
}
return total;
}
function getBestYoutubeVideoFormat(formats:Array<YoutubeVideoFormat>):Null<YoutubeVideoFormat> {
final qPriority = [1080, 720, 480, 360, 240];
for (q in qPriority) {
final quality = '${q}p';
for (format in formats) {
if (format.videoCodec == null) continue;
if (format.qualityLabel == quality) return format;
}
}
return null;
}
}
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