Replace SingleApplication with KDSingleApplication

3rdparty/kdsingleapplication/kdsingleapplication_localsocket_p.h

@@ -0,0 +1,126 @@
+/*
+  This file is part of KDSingleApplication.
+
+  SPDX-FileCopyrightText: 2019-2023 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.com>
+
+  SPDX-License-Identifier: MIT
+
+  Contact KDAB at <info@kdab.com> for commercial licensing options.
+*/
+
+#ifndef KDSINGLEAPPLICATION_LOCALSOCKET_P_H
+#define KDSINGLEAPPLICATION_LOCALSOCKET_P_H
+
+#include <QtCore/QObject>
+#include <QtCore/QByteArray>
+#include <QtCore/QString>
+
+QT_BEGIN_NAMESPACE
+class QLockFile;
+class QLocalServer;
+class QLocalSocket;
+class QTimer;
+QT_END_NAMESPACE
+
+#include <memory>
+#include <vector>
+
+struct QObjectDeleteLater
+{
+    void operator()(QObject *o)
+    {
+        o->deleteLater();
+    }
+};
+
+class QObjectConnectionHolder
+{
+    Q_DISABLE_COPY(QObjectConnectionHolder)
+    QMetaObject::Connection c;
+
+public:
+    QObjectConnectionHolder()
+    {
+    }
+
+    explicit QObjectConnectionHolder(QMetaObject::Connection _c)
+        : c(std::move(_c))
+    {
+    }
+
+    ~QObjectConnectionHolder()
+    {
+        QObject::disconnect(c);
+    }
+
+    QObjectConnectionHolder(QObjectConnectionHolder &&other) noexcept
+        : c(std::exchange(other.c, {}))
+    {
+    }
+
+    QObjectConnectionHolder &operator=(QObjectConnectionHolder &&other) noexcept
+    {
+        QObjectConnectionHolder moved(std::move(other));
+        swap(moved);
+        return *this;
+    }
+
+    void swap(QObjectConnectionHolder &other) noexcept
+    {
+        using std::swap;
+        swap(c, other.c);
+    }
+};
+
+class KDSingleApplicationLocalSocket : public QObject
+{
+    Q_OBJECT
+
+public:
+    explicit KDSingleApplicationLocalSocket(const QString &name,
+                                            QObject *parent = nullptr);
+    ~KDSingleApplicationLocalSocket();
+
+    bool isPrimaryInstance() const;
+
+public Q_SLOTS:
+    bool sendMessage(const QByteArray &message, int timeout);
+
+Q_SIGNALS:
+    void messageReceived(const QByteArray &message);
+
+private:
+    void handleNewConnection();
+    void readDataFromSecondary();
+    bool readDataFromSecondarySocket(QLocalSocket *socket);
+    void secondaryDisconnected();
+    void secondarySocketDisconnected(QLocalSocket *socket);
+    void abortConnectionToSecondary();
+
+    QString m_socketName;
+
+    std::unique_ptr<QLockFile> m_lockFile; // protects m_localServer
+    std::unique_ptr<QLocalServer> m_localServer;
+
+    struct Connection
+    {
+        explicit Connection(QLocalSocket *s);
+
+        std::unique_ptr<QLocalSocket, QObjectDeleteLater> socket;
+        std::unique_ptr<QTimer, QObjectDeleteLater> timeoutTimer;
+        QByteArray readData;
+
+        // socket/timeoutTimer are deleted via deleteLater (as we delete them
+        // in slots connected to their signals). Before the deleteLater is acted upon,
+        // they may emit further signals, triggering logic that it's not supposed
+        // to be triggered (as the Connection has already been destroyed).
+        // Use this Holder to break the connections.
+        QObjectConnectionHolder readDataConnection;
+        QObjectConnectionHolder secondaryDisconnectedConnection;
+        QObjectConnectionHolder abortConnection;
+    };
+
+    std::vector<Connection> m_clients;
+};
+
+#endif // KDSINGLEAPPLICATION_LOCALSOCKET_P_H