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/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtAddOn.JsonDb module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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 Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/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 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 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 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "jsonstream.h"
#include <QDebug>
#include <QDataStream>
#include <QLocalSocket>
#include <QAbstractSocket>
#include <QtEndian>
#include <QJsonDocument>
#ifdef QT_DEBUG
#include <QUdpSocket>
#include <QDateTime>
#include <QCoreApplication>
#endif
QT_BEGIN_NAMESPACE
namespace QtJsonDbJsonStream {
JsonStream::JsonStream(QObject *parent)
: QObject(parent), mDevice(0)
{
}
QIODevice *JsonStream::device() const
{
return mDevice;
}
/** Set the device used by the JsonStream.
The stream does not take ownership of the device.
*/
void JsonStream::setDevice(QIODevice *device, bool queued)
{
if (mDevice) {
disconnect(mDevice, SIGNAL(readyRead()), this, SLOT(deviceReadyRead()));
disconnect(mDevice, SIGNAL(bytesWritten(qint64)), this, SLOT(deviceBytesWritten(qint64)));
disconnect(mDevice, SIGNAL(aboutToClose()), this, SIGNAL(aboutToClose()));
}
mDevice = device;
if (mDevice) {
connect(mDevice, SIGNAL(readyRead()), this, SLOT(deviceReadyRead()), queued ? Qt::QueuedConnection : Qt::DirectConnection);
connect(mDevice, SIGNAL(bytesWritten(qint64)), this, SLOT(deviceBytesWritten(qint64)));
connect(mDevice, SIGNAL(aboutToClose()), this, SIGNAL(aboutToClose()));
}
}
bool JsonStream::send(const QJsonObject &object)
{
Q_ASSERT(mDevice != 0);
QByteArray data = QJsonDocument(object).toBinaryData();
int shouldWrite = data.size();
if (mWriteBuffer.isEmpty()) {
int didWrite = mDevice->write(data);
if (didWrite < 0) {
qWarning() << "Error writing to socket" << mDevice->errorString();
} else if (didWrite < shouldWrite) {
mWriteBuffer = data.mid(didWrite);
}
} else {
qWarning() << "Buffering, slow down your writes";
mWriteBuffer.append(data);
}
return true;
}
void JsonStream::deviceReadyRead()
{
struct JsonHeader
{
struct Header
{
unsigned int tag;
unsigned int version;
} h;
struct Base
{
unsigned int size;
} b;
};
while (!mDevice->atEnd()) {
int bytesAvailable = mDevice->bytesAvailable();
int offset = mReadBuffer.size();
mReadBuffer.resize(offset + bytesAvailable);
int bytesRead = mDevice->read(mReadBuffer.data()+offset, bytesAvailable);
if (bytesRead < 0) {
qWarning() << "Error reading from socket" << mDevice->errorString();
continue;
}
while (mReadBuffer.size() > static_cast<int>(sizeof(JsonHeader))) {
JsonHeader header;
memcpy(&header, mReadBuffer.constData(), sizeof(header));
if (header.h.tag != QJsonDocument::BinaryFormatTag || header.h.version != qToLittleEndian(1u)) {
mReadBuffer.clear();
qWarning() << "Got invalid binary json data";
break;
}
QJsonDocument doc(QJsonDocument::fromBinaryData(mReadBuffer, QJsonDocument::Validate));
if (doc.isEmpty())
break;
receive(doc.object());
mReadBuffer.remove(0, sizeof(header.h) + header.b.size);
}
}
}
void JsonStream::deviceBytesWritten(qint64 bytes)
{
Q_UNUSED(bytes);
if (!mWriteBuffer.isEmpty()) {
int didWrite = mDevice->write(mWriteBuffer);
if (didWrite < 0)
qWarning() << "Error writing to socket" << mDevice->errorString();
else
mWriteBuffer = mWriteBuffer.mid(didWrite);
}
}
} // namespace QtJsonDbJsonStream
QT_END_NAMESPACE
#include "moc_jsonstream.cpp"
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