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/****************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the E-Bike demo project.
**
** $QT_BEGIN_LICENSE:LGPL3$
** 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 http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPLv3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or later as published by the Free
** Software Foundation and appearing in the file LICENSE.GPL included in
** the packaging of this file. Please review the following information to
** ensure the GNU General Public License version 2.0 requirements will be
** met: http://www.gnu.org/licenses/gpl-2.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QDataStream>
#include <QJsonDocument>
#include "socketclient.h"
SocketClient::SocketClient(QObject *parent)
: QObject(parent)
, m_socket(new QLocalSocket(this))
{
// Connect socket signals
connect(m_socket, &QLocalSocket::connected, this, &SocketClient::connected);
connect(m_socket, &QLocalSocket::disconnected, this, &SocketClient::disconnected);
connect(m_socket, &QLocalSocket::readyRead, this, &SocketClient::readyRead);
// Setup timer to try to reconnect after disconnect
m_connectionTimer.setInterval(5000);
connect(&m_connectionTimer, &QTimer::timeout, this, &SocketClient::reconnect);
connect(m_socket, &QLocalSocket::connected, &m_connectionTimer, &QTimer::stop);
connect(m_socket, &QLocalSocket::disconnected,
&m_connectionTimer, static_cast<void (QTimer::*)()>(&QTimer::start));
connect(m_socket, static_cast<void(QLocalSocket::*)(QLocalSocket::LocalSocketError)>(&QLocalSocket::error),
&m_connectionTimer, static_cast<void (QTimer::*)()>(&QTimer::start));
}
void SocketClient::connectToServer(const QString &servername)
{
m_servername = servername;
reconnect();
}
void SocketClient::reconnect()
{
qDebug("Connecting to server...");
m_socket->connectToServer(m_servername);
}
qint64 SocketClient::write(const QByteArray &data)
{
return m_socket->write(data);
}
/**
* @brief send a QByteArray to the server
* @param message
*
* Adds the length of the message as a header and sends the message to the server.
*/
void SocketClient::sendToServer(const QByteArray &message)
{
// Prepend the message length
QByteArray data;
QDataStream stream(&data, QIODevice::WriteOnly);
stream << static_cast<qint32>(message.size() + 4);
data.append(message);
write(data);
}
/**
* @brief send a Json object to the server
* @param message
*
* Sends a QJsonObject object to the server, encoded in Qt's internal binary format.
*/
void SocketClient::sendToServer(const QJsonObject &message)
{
QJsonDocument doc(message);
sendToServer(doc.toBinaryData());
}
/**
* @brief reads incoming data from the server
*
* Parses only message headers and body as QByteArray, but does not care about
* the contents. All complete messages are processed at @see parseMessage.
*/
void SocketClient::readyRead()
{
m_data += m_socket->readAll();
bool messagefound = true;
while (messagefound) {
messagefound = false;
// If we have at least some data
if (m_data.size() >= 4) {
// Extract message size
qint32 messagesize;
QDataStream stream(m_data.left(4));
stream >> messagesize;
// If we have enough data for at least one message
if (m_data.size() >= messagesize) {
// Extract actual message
QByteArray message = m_data.mid(4, messagesize - 4);
parseMessage(message);
// Drop necessary amount of bytes
m_data = m_data.mid(messagesize);
messagefound = true; // Try to parse another message
}
}
}
}
/**
* @brief parse the contents of a QByteArray
* @param message
*
* Contents are parsed from QJsonDocument's binary data. This separation allows
* the format to be changed later on, if need be.
*/
void SocketClient::parseMessage(const QByteArray &message)
{
// Parse message from raw format
QJsonDocument doc = QJsonDocument::fromBinaryData(message);
emit newMessage(doc.object());
}
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