UiGuiIndentServer.cpp

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/***************************************************************************
 *   Copyright (C) 2006-2012 by Thomas Schweitzer                          *
 *   thomas-schweitzer(at)arcor.de                                         *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License version 2.0 as   *
 *   published by the Free Software Foundation.                            *
 *                                                                         *
 *   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 in the file LICENSE.GPL; if not, write to the *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/

#include "UiGuiIndentServer.h"

#include <QTcpServer>
#include <QTcpSocket>
#include <QMessageBox>
#include <QtDebug>


UiGuiIndentServer::UiGuiIndentServer(void) : QObject() {
    _tcpServer = NULL;
    _currentClientConnection = NULL;
    _readyForHandleRequest = false;
}


UiGuiIndentServer::~UiGuiIndentServer(void) {
}


void UiGuiIndentServer::startServer() {
    if ( _tcpServer == NULL ) {
        _tcpServer = new QTcpServer(this);
    }

    if ( !_tcpServer->isListening() ) {
        if ( !_tcpServer->listen(QHostAddress::Any, quint16(84484)) ) {
            QMessageBox::critical( NULL, tr("UiGUI Server"), tr("Unable to start the server: %1.").arg(_tcpServer->errorString()) );
            return;
        }
    }

    connect( _tcpServer, SIGNAL(newConnection()), this, SLOT(handleNewConnection()) );
    _readyForHandleRequest = true;
    _blockSize = 0;
}


void UiGuiIndentServer::stopServer() {
    if ( _tcpServer != NULL ) {
        _tcpServer->close();
        delete _tcpServer;
        _tcpServer = NULL;
    }
    _currentClientConnection = NULL;
    _readyForHandleRequest = false;
}


void UiGuiIndentServer::handleNewConnection() {
    QTcpSocket *clientConnection = _tcpServer->nextPendingConnection();
    connect( clientConnection, SIGNAL(disconnected()), clientConnection, SLOT(deleteLater()) );

    connect( clientConnection, SIGNAL(readyRead()), this, SLOT(handleReceivedData()) );
}


void UiGuiIndentServer::handleReceivedData() {
    if ( !_readyForHandleRequest ) {
        return;
    }

    _currentClientConnection = qobject_cast<QTcpSocket*>( sender() );
    QString receivedData = "";

    if ( _currentClientConnection != NULL ) {
        QDataStream in(_currentClientConnection);
        in.setVersion(QDataStream::Qt_4_0);

        if ( _blockSize == 0 ) {
            if ( _currentClientConnection->bytesAvailable() < (int)sizeof(quint32) )
                return;

            in >> _blockSize;
        }

        if ( _currentClientConnection->bytesAvailable() < _blockSize )
            return;

        QString receivedMessage;
        in >> receivedMessage;

        _blockSize = 0;

        qDebug() << "receivedMessage: " << receivedMessage;

        if ( receivedMessage == "ts" ) {
            sendMessage("Toll");
        }
        else {
            sendMessage("irgendwas");
        }
    }
}


void UiGuiIndentServer::sendMessage( const QString &message ) {
    _readyForHandleRequest = false;

    _dataToSend = "";
    QDataStream out(&_dataToSend, QIODevice::WriteOnly);
    out.setVersion(QDataStream::Qt_4_0);
    out << (quint32)0;
    out << message;
    out.device()->seek(0);
    out << (quint32)(_dataToSend.size() - sizeof(quint32));

    connect(_currentClientConnection, SIGNAL(bytesWritten(qint64)), this, SLOT(checkIfReadyForHandleRequest()));
    _currentClientConnection->write(_dataToSend);
}


void UiGuiIndentServer::checkIfReadyForHandleRequest() {
    if ( _currentClientConnection->bytesToWrite() == 0 ) {
        QString dataToSendStr = _dataToSend.right( _dataToSend.size() - sizeof(quint32) );
        qDebug() << "checkIfReadyForHandleRequest _dataToSend was: " << dataToSendStr;
        disconnect(_currentClientConnection, SIGNAL(bytesWritten(qint64)), this, SLOT(checkIfReadyForHandleRequest()));
        _readyForHandleRequest = true;
    }
}