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package server.cache;
import haxe.io.Path;
import js.lib.Promise;
import js.node.ChildProcess;
import js.node.child_process.ChildProcess as ChildProcessObject;
import sys.FileSystem;
import ytdlp_nodejs.ArgsOptions;
import ytdlp_nodejs.VideoInfo;
import ytdlp_nodejs.VideoProgress;
import ytdlp_nodejs.YtDlp;
typedef YtdlpHandlers = {
final onProgress:(p:VideoProgress) -> Void;
final onComplete:() -> Void;
final onError:(err:String) -> Void;
}
class YtdlpCache {
final main:Main;
final cache:Cache;
var ytDlp:Null<YtDlp>;
public function new(main:Main, cache:Cache):Void {
this.main = main;
this.cache = cache;
}
public function checkYtDeps():Bool {
try {
ChildProcess.execSync("ffmpeg -version", {stdio: "ignore", timeout: 5000});
ytDlp = js.Syntax.code("new (require('ytdlp-nodejs')).YtDlp()");
return true;
} catch (e) {
return false;
}
}
public function checkUpdate():Void {
ytDlp.execAsync("", {
updateTo: main.config.ytDlp.channel,
onData: d -> {
trace(d);
}
}).catchError(e -> {
trace(e);
});
}
public function cleanInputFiles(prefix = "__tmp"):Void {
final names = FileSystem.readDirectory(cache.cacheDir);
for (name in names) {
if (!name.startsWith(prefix)) continue;
cache.remove(name);
}
}
public function getInfoAsync(url:String, useCookies = false):Promise<VideoInfo> {
return cast ytDlp.getInfoAsync(url, cast {
cookies: useCookies ? getCookiesPathOrNull() : null,
additionalOptions: ytExtraOptions(),
});
}
public function getCookiesPathOrNull():Null<String> {
final cookiesPath = '${main.userDir}/cookies.txt';
return FileSystem.exists(cookiesPath) ? cookiesPath : null;
}
public function ytExtraOptions():Array<String> {
return ["--no-js-runtimes", "--js-runtimes", main.config.ytDlp.jsRuntime];
}
/**
Runs `yt-dlp <url> --ies default,-generic` to check if a site-specific
extractor handles the url. Returns the process so it can be killed on cancel.
**/
public function checkUrlSupported(url:String, callback:(supported:Bool) -> Void):ChildProcessObject {
final process:ChildProcessObject = ytDlp.exec(url, {
useExtractors: ["default", "-generic"],
simulate: true,
quiet: true,
socketTimeout: 5,
extractorRetries: 0,
});
var done = false;
inline function finish(supported:Bool):Void {
if (done) return;
done = true;
callback(supported);
}
process.on("close", (code:Int, _signal:String) -> finish(code == 0));
process.on("error", (_err:Dynamic) -> finish(false));
return process;
}
/**
Spawns yt-dlp as a manual process and wires progress/completion to `handlers`.
Returns the process so the caller can kill it on cancel.
**/
public function download(url:String, options:ArgsOptions, handlers:YtdlpHandlers):ChildProcessObject {
final process:ChildProcessObject = ytDlp.exec(url, options);
var stderr = "";
var done = false;
process.stderr.on("data", (d:Dynamic) -> stderr += d);
process.on("progress", (p:VideoProgress) -> handlers.onProgress(p));
process.on("close", (code:Int, _signal:String) -> {
if (done) return;
done = true;
if (code == 0) handlers.onComplete();
else handlers.onError('yt-dlp exited with code $code: $stderr');
});
process.on("error", (err:Dynamic) -> {
if (done) return;
done = true;
handlers.onError('Failed to start yt-dlp process: $err');
});
return process;
}
/**
Generic best-quality download to mp4 for vk and other site-specific
extractors. Used after `checkUrlSupported` succeeds (or directly for vk).
**/
public function cacheVideo(client:Client, url:String, cb:CacheCallbacks):Void {
final clientName = client.name;
final outName = deriveOutName(url);
trace('Caching $url to $outName...');
cb.onResolved(cache.getFileUrl(outName));
final inName = '__tmp-${Std.random(0xFFFFFF)}-${Path.withoutExtension(outName)}';
var canceled = false;
var process:Null<ChildProcessObject> = null;
inline function cleanup():Void {
cleanInputFiles(inName);
}
if (cb.registerCancel != null) cb.registerCancel(() -> {
canceled = true;
process?.kill();
cleanup();
});
var useCookies = false;
var lastSentRatio = 0.0;
function onGetInfo(info:VideoInfo):Void {
if (canceled) return;
if (cb.onMetadata != null) cb.onMetadata(info.title, info.duration);
if (!cache.removeOlderCache(estimateSize(info) * 2 + cache.freeSpaceBlock)) {
cleanup();
cb.onError();
log(clientName, cache.notEnoughSpaceErrorText);
return;
}
process = download(url, {
output: '${cache.cacheDir}/$inName',
remuxVideo: "mp4",
additionalOptions: ytExtraOptions(),
cookies: useCookies ? getCookiesPathOrNull() : null,
forceIpv4: true,
socketTimeout: 5,
extractorRetries: 0,
}, {
onProgress: p -> {
if (canceled) return;
final ratio = p.status == "finished" ? 1.0 : (p.downloaded / p.total)
.clamp(0, 1);
if (ratio - lastSentRatio < 0.01 && ratio < 1) return;
lastSentRatio = ratio;
cb.onProgress(ratio.toFixed(4));
},
onComplete: () -> {
if (canceled) {
cleanup();
return;
}
final name = cache.findFile(n -> n.startsWith(inName)) ?? {
final err = 'Error: cannot find downloaded file with prefix $inName';
cache.logWithAdmins(client, err);
cb.onError();
return;
};
FileSystem.rename('${cache.cacheDir}/$name', '${cache.cacheDir}/$outName');
cleanup();
cache.add(outName);
cb.onComplete();
},
onError: err -> {
if (canceled) return;
cache.logWithAdmins(client, "Error during video download: " + err);
cleanup();
cb.onError();
}
});
}
getInfoAsync(url, useCookies).then(onGetInfo).catchError(err -> {
if (canceled) return;
useCookies = true;
getInfoAsync(url, useCookies).then(onGetInfo).catchError(err -> {
cleanup();
cb.onError();
log(clientName, "" + err);
});
});
}
function deriveOutName(url:String):String {
final decoded = try url.urlDecode() catch (e) url;
var last = decoded.substr(decoded.lastIndexOf("/") + 1);
final q = last.indexOf("?");
if (q != -1) last = last.substr(0, q);
last = Path.withoutExtension(last);
if (last == "") last = "video";
return cache.getFreeFileName('$last.mp4');
}
function estimateSize(info:VideoInfo):Int {
final d:Dynamic = info;
final size:Null<Float> = d.filesize_approx ?? d.filesize;
return Std.int(size ?? 0);
}
function log(clientName:String, msg:String):Void {
cache.logByName(clientName, msg);
}
}
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