src/singleapplication.cpp


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/*
 * This file is part of smolbote. It's copyrighted by the contributors recorded
 * in the version control history of the file, available from its original
 * location: git://neueland.iserlohn-fortress.net/smolbote.git
 * 
 * SPDX-License-Identifier: GPL-3.0
 */

#include "singleapplication.h"
#include <QLocalServer>
#include <QLocalSocket>
#include <QDataStream>

SingleApplication::SingleApplication(int &argc, char **argv) : QApplication(argc, argv)
{
}

SingleApplication::~SingleApplication()
{
    if(m_localServer) {
        if(m_localServer->isListening()) {
            m_localServer->close();
            QLocalServer::removeServer(LOCALSERVER_KEY);
        }
    }
}

void SingleApplication::bindLocalSocket()
{
    m_localServer = new QLocalServer(this);
    connect(m_localServer, &QLocalServer::newConnection, this, &SingleApplication::slot_receiveMessage);

    // check for running local server by connecting to it
    QLocalSocket socket;
    socket.connectToServer(LOCALSERVER_KEY);
    if(socket.waitForConnected(LOCALSERVER_TIMEOUT)) {
        // there is another server
        qWarning("Another server is running");
        socket.close();
        return;
    } else {
        // no other server
        QLocalServer::removeServer(LOCALSERVER_KEY);
        if(!m_localServer->listen(LOCALSERVER_KEY)) {
            qWarning("Cannot bind local server [%s]", qUtf8Printable(LOCALSERVER_KEY));
        }
    }

}

bool SingleApplication::isRunning()
{
    return !m_localServer->isListening();
}

bool SingleApplication::sendMessage(const QHash<QString, QVariant> &params)
{
    QLocalSocket socket;
    socket.connectToServer(LOCALSERVER_KEY);
    if(socket.waitForConnected(LOCALSERVER_TIMEOUT)) {
        QByteArray argumentData;
        QDataStream ds(&argumentData, QIODevice::WriteOnly);
        ds << params;

        socket.write(argumentData);
        socket.waitForBytesWritten(LOCALSERVER_TIMEOUT);
        return true;
    }

    return false;
}

void SingleApplication::slot_receiveMessage()
{
    QLocalSocket *socket = m_localServer->nextPendingConnection();
    if(!socket) {
        // null socket --> return
        return;
    }

    socket->waitForReadyRead();

    QByteArray argumentData = socket->readAll();

    // skip if we got no data
    if(argumentData.isEmpty()) {
        return;
    }

    QHash<QString, QVariant> params;
    QDataStream ds(argumentData);
    ds >> params;

    socket->deleteLater();

    emit messageAvailable(params);
}