core/ipc: add ipc server/client

Currently can only kill a remote instance.

src/core/ipc.hpp

@@ -0,0 +1,74 @@
+#pragma once
+
+#include <functional>
+
+#include <qlocalserver.h>
+#include <qlocalsocket.h>
+#include <qobject.h>
+#include <qtmetamacros.h>
+
+namespace qs::ipc {
+
+enum class IpcCommand : quint8 {
+	Unknown = 0,
+	Kill,
+};
+
+class IpcServer: public QObject {
+	Q_OBJECT;
+
+public:
+	explicit IpcServer(const QString& path);
+
+	static void start();
+
+private slots:
+	void onNewConnection();
+
+private:
+	QLocalServer server;
+};
+
+class IpcServerConnection: public QObject {
+	Q_OBJECT;
+
+public:
+	explicit IpcServerConnection(QLocalSocket* socket, IpcServer* server);
+
+private slots:
+	void onDisconnected();
+	void onReadyRead();
+
+private:
+	QLocalSocket* socket;
+	QDataStream stream;
+};
+
+class IpcClient: public QObject {
+	Q_OBJECT;
+
+public:
+	explicit IpcClient(const QString& path);
+
+	[[nodiscard]] bool isConnected() const;
+	void waitForConnected();
+	void waitForDisconnected();
+
+	void kill();
+
+	[[nodiscard]] static bool
+	connect(const QString& id, const std::function<void(IpcClient& client)>& callback);
+
+signals:
+	void connected();
+	void disconnected();
+
+private slots:
+	static void onError(QLocalSocket::LocalSocketError error);
+
+private:
+	QLocalSocket socket;
+	QDataStream stream;
+};
+
+} // namespace qs::ipc