src/singleapplication.cpp


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/*******************************************************************************
 **
 ** smolbote: yet another qute browser
 ** Copyright (C) 2017  Xian Nox
 **
 ** This program 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.
 **
 ** This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 **
 ******************************************************************************/

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

SingleApplication::SingleApplication(int &argc, char **argv) : QApplication(argc, argv)
{
    m_localServer = new QLocalServer(this);
    connect(m_localServer, SIGNAL(newConnection()), this, SLOT(receiveMessage()));

    // if we can't send the arguments to a listening local server, start one
    if(!sendMessage(arguments())) {
        // remove any unused socket
        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 QStringList &params)
{
    QLocalSocket socket;
    socket.connectToServer(LOCALSERVER_KEY);
    if(socket.waitForConnected(LOCALSERVER_TIMEOUT)) {
        socket.write(params.join('|').toUtf8());
        socket.waitForBytesWritten();
        return true;
    }

    return false;
}

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

    socket->waitForReadyRead();
    const QStringList params = QString(socket->readAll()).split('|');
    socket->deleteLater();

    emit messageAvailable(params);
}