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package server.cache;
import haxe.Json;
import js.lib.Promise;
import js.node.Buffer;
import js.node.ChildProcess;
import js.node.Fs.Fs;
import js.node.stream.Readable;
import sys.FileSystem;
import sys.io.File;
import utils.YoutubeUtils;
class YoutubeCache {
final main:Main;
final cache:Cache;
public function new(main:Main, cache:Cache):Void {
this.main = main;
this.cache = cache;
}
public 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;
}
}
public function cleanYtInputFiles():Void {
final names = FileSystem.readDirectory(cache.cacheDir);
for (name in names) {
if (!name.startsWith("__tmp")) continue;
cache.remove(name);
}
}
public function cacheYoutubeVideo(client:Client, url:String, callback:(name:String) -> Void) {
if (!cache.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: $url');
return;
}
final outName = videoId + ".mp4";
if (cache.exists(outName)) {
callback(outName);
return;
}
final inVideoName = '__tmp-video-$videoId';
final inAudioName = '__tmp-audio-$videoId';
inline function removeInputFiles():Void {
cache.remove(inVideoName);
cache.remove(inAudioName);
}
inline function checkEnoughSpace(contentLength:Int):Bool {
final hasSpace = cache.removeOlderCache(contentLength + cache.freeSpaceBlock);
if (!hasSpace) {
removeInputFiles();
cancelProgress(client);
log(client, cache.notEnoughSpaceErrorText);
}
return hasSpace;
}
if (cache.isFileExists(inVideoName)) {
log(client, 'Caching $outName already in progress');
return;
}
final ytdl:Dynamic = untyped require("@distube/ytdl-core");
trace('Caching $url to $outName...');
main.send(client, {
type: Progress,
progress: {
type: Caching,
ratio: 0,
data: outName
}
});
var agent:Any = null;
final cookiesPath = '${main.userDir}/cookies.json';
if (FileSystem.exists(cookiesPath)) {
agent = ytdl.createAgent(Json.parse(File.getContent(cookiesPath)));
}
final promise:Promise<YouTubeVideoInfo> = ytdl.getInfo(url, {
agent: agent,
});
promise.then(info -> {
trace('Get info with ${info.formats.length} formats');
final audioFormat:YoutubeVideoFormat = try {
ytdl.chooseFormat(info.formats.filter(item -> {
return item.audioCodec?.startsWith("mp4a");
}), {quality: "highestaudio"});
} catch (e) {
log(client, "Error: audio format not found");
trace(e);
trace(info.formats.filter(item -> item.hasAudio));
return;
}
var videoFormat = getBestYoutubeVideoFormat(info.formats) ?? {
log(client, "Error: video format not found");
trace(info.formats.filter(item -> item.hasVideo));
return;
}
inline function getTotalFormatsSize():Int {
final videoSize = Std.parseInt(videoFormat.contentLength) ?? 0;
final audioSize = Std.parseInt(audioFormat.contentLength) ?? 0;
return videoSize + audioSize;
}
// check if we have space for formats and video build
final hasSpace = cache.removeOlderCache(getTotalFormatsSize() * 2
+ cache.freeSpaceBlock);
if (!hasSpace) {
// try fallback to worse video quality
videoFormat = getBestYoutubeVideoFormat(info.formats, videoFormat.qualityLabel);
if (!checkEnoughSpace(getTotalFormatsSize() * 2)) return;
}
final dlVideo:Readable<Dynamic> = ytdl(url, {
format: videoFormat,
agent: agent,
});
dlVideo.pipe(Fs.createWriteStream('${cache.cacheDir}/$inVideoName'));
dlVideo.on("error", err -> {
log(client, "Error during video download: " + err);
removeInputFiles();
cancelProgress(client);
});
final dlAudio:Readable<Dynamic> = ytdl(url, {
format: audioFormat,
agent: agent,
});
dlAudio.pipe(Fs.createWriteStream('${cache.cacheDir}/$inAudioName'));
dlAudio.on("error", err -> {
log(client, "Error during audio download: " + err);
removeInputFiles();
cancelProgress(client);
});
var count = 0;
function onComplete(type:String):Void {
count++;
trace('$type track downloaded ($count/2)');
if (count < 2) return;
if (!cache.isFileExists(inVideoName) || !cache.isFileExists(inAudioName)) {
log(client, "Input files not found for making final video");
removeInputFiles();
cancelProgress(client);
return;
}
var size = FileSystem.stat('${cache.cacheDir}/$inVideoName').size;
size += FileSystem.stat('${cache.cacheDir}/$inAudioName').size;
// clean some space for full mp4
if (!checkEnoughSpace(size)) return;
final args = '-y -i ./$inVideoName -i ./$inAudioName -c copy -map 0:v -map 1:a ./$outName'.split(" ");
final process = ChildProcess.spawn("ffmpeg", args, {
cwd: cache.cacheDir,
// stdio: "ignore"
});
final outputData:Array<Buffer> = [];
process.stderr.on("data", (data) -> outputData.push(data));
process.on("close", (code:Int) -> {
removeInputFiles();
if (code != 0) {
cancelProgress(client);
final errCodeMsg = 'Error: ffmpeg closed with code $code';
final admins = main.clients.filter(client -> client.isAdmin);
for (client in admins) {
log(client, Buffer.concat(outputData).toString());
log(client, errCodeMsg);
}
if (!admins.contains(client)) log(client, errCodeMsg);
return;
}
cache.add(outName);
callback(outName);
});
}
dlVideo.on("finish", () -> onComplete("Video"));
dlAudio.on("finish", () -> onComplete("Audio"));
dlVideo.on("progress", (chunkLength:Int, downloaded:Int, contentLength:Int) -> {
final ratio = (downloaded / contentLength).clamp(0, 1);
main.send(client, {
type: Progress,
progress: {
type: Downloading,
ratio: ratio
}
});
});
}).catchError(err -> {
removeInputFiles();
cancelProgress(client);
log(client, "" + err);
});
}
function getBestYoutubeVideoFormat(formats:Array<YoutubeVideoFormat>, ?ignoreQuality:String):Null<YoutubeVideoFormat> {
final qPriority = [1080, 720, 480, 360, 240, 144];
for (q in qPriority) {
final quality = '${q}p';
if (quality == ignoreQuality) continue;
for (format in formats) {
if (format.videoCodec == null) continue;
if (format.qualityLabel == quality) return format;
}
}
return null;
}
function log(client:Client, msg:String):Void {
cache.log(client, msg);
}
function cancelProgress(client:Client):Void {
main.send(client, {
type: Progress,
progress: {
type: Canceled,
ratio: 0
}
});
}
}
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