Switched from sync transcoder to async transcoder

src/libs/utils/include/utils/IChildProcess.hpp

@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2020 Emeric Poupon
+ *
+ * This file is part of LMS.
+ *
+ * LMS is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * LMS is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with LMS.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#pragma once
+
+#include <cstddef>
+#include <functional>
+#include <string>
+#include <vector>
+
+#include "utils/Exception.hpp"
+
+class ChildProcessException : public LmsException
+{
+	public:
+		using LmsException::LmsException;
+};
+
+class IChildProcess
+{
+	public:
+		using Args = std::vector<std::string>;
+
+		virtual ~IChildProcess() = default;
+
+		enum class ReadResult
+		{
+			Success,
+			Error,
+			EndOfFile,
+		};
+
+		using ReadCallback = std::function<void(ReadResult, std::size_t)>;
+		virtual void		asyncRead(std::byte* data, std::size_t bufferSize, ReadCallback callback) = 0;
+
+		using WaitCallback = std::function<void(void)>;
+		virtual void		asyncWaitForData(WaitCallback cb) = 0;
+		virtual std::size_t	readSome(std::byte* data, std::size_t bufferSize) = 0;
+		virtual bool		finished() = 0;
+};
+

src/libs/utils/include/utils/IChildProcessManager.hpp

@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2020 Emeric Poupon
+ *
+ * This file is part of LMS.
+ *
+ * LMS is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * LMS is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with LMS.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#pragma once
+
+#include <filesystem>
+#include <memory>
+#pragma once
+
+#include <filesystem>
+#include <memory>
+
+#include "IChildProcess.hpp"
+
+class IChildProcessManager
+{
+	public:
+		virtual ~IChildProcessManager() = default;
+
+		virtual std::unique_ptr<IChildProcess> spawnChildProcess(const std::filesystem::path& path, const IChildProcess::Args& args) = 0;
+};
+
+std::unique_ptr<IChildProcessManager> createChildProcessManager();
+
+

src/libs/utils/include/utils/IResourceHandler.hpp

@@ -22,13 +22,12 @@
 #include <Wt/Http/Request.h>
 #include <Wt/Http/Response.h>
 
-// Helper class to serve a resource (must be saved as continuation data if not complete) 
+// Helper class to serve a resource (must be saved as continuation data if not complete)
 class IResourceHandler
 {
 	public:
 		virtual ~IResourceHandler() = default;
 
-		virtual void processRequest(const Wt::Http::Request& request, Wt::Http::Response& response) = 0;
-		virtual bool isFinished() const = 0;
+		[[nodiscard]] virtual Wt::Http::ResponseContinuation* processRequest(const Wt::Http::Request& request, Wt::Http::Response& response) = 0;
 };
 

src/libs/utils/include/utils/Logger.hpp

@@ -38,6 +38,7 @@ enum class Module
 	API_SUBSONIC,
 	AUTH,
 	AV,
+	CHILDPROCESS,
 	COVER,
 	DB,
 	DBUPDATER,