99048c1c
 Steven de Ridder
Initial commit. d...
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/* ****************************************************************************
* Copyright 2019 Open Systems Development BV *
* *
* Permission is hereby granted, free of charge, to any person obtaining a *
* copy of this software and associated documentation files (the "Software"), *
* to deal in the Software without restriction, including without limitation *
* the rights to use, copy, modify, merge, publish, distribute, sublicense, *
* and/or sell copies of the Software, and to permit persons to whom the *
* Software is furnished to do so, subject to the following conditions: *
* *
* The above copyright notice and this permission notice shall be included in *
* all copies or substantial portions of the Software. *
* *
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR *
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL *
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER *
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING *
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER *
* DEALINGS IN THE SOFTWARE. *
* ***************************************************************************/
#include "tcpinterface.h"
#include "log.h"
#include <QHostAddress>
#include <QTcpServer>
#include <QTcpSocket>
#include <QDataStream>
namespace osdev {
namespace components {
TcpInterface::TcpInterface(const QString& hostName, int port, bool i_bServer)
: m_bServer( i_bServer ),
m_active(false),
m_tcpServer( nullptr ),
m_tcpSocket( nullptr ),
m_clientConnection( nullptr ),
m_blockSize( 0 ),
m_dataList()
{
QHostAddress hostAddress(hostName);
if (m_bServer)
{ // This interface is a server
m_tcpServer = new QTcpServer(this);
connect(m_tcpServer, SIGNAL(newConnection()), this, SLOT(newConnection()));
m_active = m_tcpServer->listen(hostAddress, static_cast<quint16>(port));
if (!m_active)
{
LogWarning("interfaceplugin",
"Unable to start the server: " + m_tcpServer->errorString());
}
}
else
{ // This interface is a client
m_tcpSocket = new QTcpSocket(this);
m_tcpSocket->connectToHost(hostAddress, static_cast<quint16>(port));
m_active = m_tcpSocket->waitForConnected(1000);
if (m_active)
{
connect(m_tcpSocket, SIGNAL(readyRead()), this, SLOT(readData()));
}
}
}
TcpInterface::~TcpInterface()
{
}
QString TcpInterface::getData()
{
QString qsResult;
if(!m_dataList.isEmpty())
{
qsResult = m_dataList.takeFirst();
}
return qsResult;
}
void TcpInterface::readData()
{
QTcpSocket* pSocket = nullptr;
/* Retrieve the correct Socket, depending on connection-type */
if (m_bServer)
{
pSocket = m_clientConnection;
}
else
{
pSocket = m_tcpSocket;
}
/* Construct a DataStream from the Socket */
QDataStream in(pSocket);
in.setVersion(QDataStream::Qt_5_4);
// Process while there is a following message in this same buffer.
do {
LogDebug("TcpInterface", "read bytes");
/* The size of the message in bytes is required */
if (m_blockSize == 0)
{
/*
* The size of the message should be available as the first four
* blocks of the message; i.e. (sizeof(quint32))
*/
if (pSocket->bytesAvailable() < static_cast<int>(sizeof(quint32)))
{
return;
}
/* Retrieve the blocksize if it is fully available from the socket */
in >> m_blockSize;
LogDebug("TcpInterface", QString("block size is %1").arg(m_blockSize));
}
if (pSocket->bytesAvailable() < m_blockSize)
{
return;
}
/*
* Retrieve the message if it is completely available from the socket.
* I.e.: The number of available bytes must be at least the retrieved
* message-size.
*/
QByteArray pDataStore;
/*
* Using an empty QByteArray the operator>> can be used, because it then
* reads in everything until the first '\0' character.
* It is then required that all messages are ended by a '\0'. This is
* standard when sending QByteArrays.
*/
in >> pDataStore;
/*
* An entire message is stored in a new QByteArray and must be pushed on
* the stack of available messages
*/
m_dataList.append( pDataStore );
m_blockSize = 0; // reset blocksize for next read
emit dataPresent();
} while (pSocket->bytesAvailable() > 0);
}
void TcpInterface::sendData(const QString& i_qsData)
{
QByteArray block;
QDataStream out(&block, QIODevice::WriteOnly);
out.setVersion(QDataStream::Qt_5_4);
out << block.size();
out << i_qsData.toLatin1();
if (m_bServer)
{
m_clientConnection->write(block);
m_clientConnection->flush();
}
else
{
m_tcpSocket->write(block);
m_tcpSocket->flush();
}
}
void TcpInterface::newConnection()
{
m_clientConnection = m_tcpServer->nextPendingConnection();
connect(m_clientConnection, SIGNAL(readyRead()), this, SLOT(readData()));
}
}
}
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