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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef CONNECTION_H
#define CONNECTION_H
#include <QCborStreamReader>
#include <QCborStreamWriter>
#include <QElapsedTimer>
#include <QHostAddress>
#include <QString>
#include <QTcpSocket>
#include <QTimer>
static const int MaxBufferSize = 1024000;
class Connection : public QTcpSocket
{
Q_OBJECT
public:
enum ConnectionState {
WaitingForGreeting,
ReadingGreeting,
ReadyForUse
};
enum DataType {
PlainText,
Ping,
Pong,
Greeting,
Undefined
};
Connection(QObject *parent = 0);
Connection(qintptr socketDescriptor, QObject *parent = 0);
~Connection();
QString name() const;
void setGreetingMessage(const QString &message);
bool sendMessage(const QString &message);
signals:
void readyForUse();
void newMessage(const QString &from, const QString &message);
protected:
void timerEvent(QTimerEvent *timerEvent) override;
private slots:
void processReadyRead();
void sendPing();
void sendGreetingMessage();
private:
bool hasEnoughData();
void processGreeting();
void processData();
QCborStreamReader reader;
QCborStreamWriter writer;
QString greetingMessage;
QString username;
QTimer pingTimer;
QElapsedTimer pongTime;
QString buffer;
ConnectionState state;
DataType currentDataType;
int transferTimerId;
bool isGreetingMessageSent;
};
#endif
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