init

Telegram/lib_base/base/single_instance.h

@@ -0,0 +1,58 @@
+// This file is part of Desktop App Toolkit,
+// a set of libraries for developing nice desktop applications.
+//
+// For license and copyright information please follow this link:
+// https://github.com/desktop-app/legal/blob/master/LEGAL
+//
+#pragma once
+
+#include "base/file_lock.h"
+
+#include <QtNetwork/QLocalServer>
+#include <QtNetwork/QLocalSocket>
+
+namespace base {
+
+class SingleInstance final {
+public:
+	struct Message {
+		uint32 id = 0;
+		QByteArray data;
+	};
+
+	SingleInstance();
+	~SingleInstance();
+
+	void start(
+		const QString &uniqueApplicationName,
+		const QString &path,
+		Fn<void()> primary,
+		Fn<void()> secondary,
+		Fn<void()> fail);
+
+	void send(const QByteArray &command, Fn<void()> done);
+	[[nodiscard]] rpl::producer<Message> commands() const;
+	void reply(uint32 commandId, QWidget *activate = nullptr);
+
+private:
+	void clearSocket();
+	void clearLock();
+	[[nodiscard]] bool closeExisting();
+
+	void newInstanceConnected();
+	void readClient(not_null<QLocalSocket*> client);
+	void removeClient(not_null<QLocalSocket*> client);
+
+	QString _name;
+	QLocalServer _server;
+	QLocalSocket _socket;
+	uint32 _lastMessageId = 0;
+	base::flat_map<not_null<QLocalSocket*>, Message> _clients;
+	rpl::event_stream<Message> _commands;
+
+	QFile _lockFile;
+	FileLock _lock;
+
+};
+
+} // namespace base