Initial cache support for raw videos

m3u8 videos are cached without downloading segments, only m3u8 file is downloaded and segment links are updated to use synctube proxy, so you can add video to playlist as server, ignoring ip restrictions, and stream it to everyone

1 files changed, 236 insertions, 0 deletions

diff --git a/src/server/cache/YoutubeCache.hx b/src/server/cache/YoutubeCache.hx
new file mode 100644
index 0000000..c0a5c4c
--- /dev/null
+++ b/src/server/cache/YoutubeCache.hx
@@ -0,0 +1,236 @@
+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
+			}
+		});
+	}
+}