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/**************************************************************************
**
** Copyright (C) 2022 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Installer Framework.
**
** $QT_BEGIN_LICENSE:GPL-EXCEPT$
** 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.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
**************************************************************************/
#ifndef REMOTEOBJECT_H
#define REMOTEOBJECT_H
#include "errors.h"
#include "installer_global.h"
#include "protocol.h"
#include <QCoreApplication>
#include <QDataStream>
#include <QObject>
#include <QLocalSocket>
namespace QInstaller {
class INSTALLER_EXPORT RemoteObject : public QObject
{
Q_OBJECT
Q_DISABLE_COPY(RemoteObject)
public:
RemoteObject(const QString &wrappedType, QObject *parent = 0);
virtual ~RemoteObject() = 0;
bool isConnectedToServer() const;
void callRemoteMethod(const QString &name);
template<typename T1, typename T2>
void callRemoteMethod(const QString &name, const T1 &arg, const T2 &arg2)
{
const QString reply = sendReceivePacket<QString>(name, arg, arg2, dummy);
Q_ASSERT(reply == QLatin1String(Protocol::DefaultReply));
}
template<typename T1, typename T2, typename T3>
void callRemoteMethod(const QString &name, const T1 &arg, const T2 &arg2, const T3 & arg3)
{
const QString reply = sendReceivePacket<QString>(name, arg, arg2, arg3);
Q_ASSERT(reply == QLatin1String(Protocol::DefaultReply));
}
template<typename T>
T callRemoteMethod(const QString &name) const
{
return sendReceivePacket<T>(name, dummy, dummy, dummy);
}
template<typename T, typename T1>
T callRemoteMethod(const QString &name, const T1 &arg) const
{
return sendReceivePacket<T>(name, arg, dummy, dummy);
}
template<typename T, typename T1, typename T2>
T callRemoteMethod(const QString &name, const T1 & arg, const T2 &arg2) const
{
return sendReceivePacket<T>(name, arg, arg2, dummy);
}
template<typename T, typename T1, typename T2, typename T3>
T callRemoteMethod(const QString &name, const T1 &arg, const T2 &arg2, const T3 &arg3) const
{
return sendReceivePacket<T>(name, arg, arg2, arg3);
}
protected:
bool authorize();
bool connectToServer(const QVariantList &arguments = QVariantList());
// Use this structure to allow derived classes to manipulate the template
// function signature of the callRemoteMethod templates, since most of the
// generated functions will differ in return type rather given arguments.
struct Dummy {}; Dummy *dummy;
private:
template<typename T> bool isValueType(T) const
{
return true;
}
template<typename T> bool isValueType(T *dummy) const
{
// Force compiler error while passing anything different then Dummy* to the function.
// It really doesn't make sense to send any pointer over to the server, so bail early.
Q_UNUSED(static_cast<Dummy*> (dummy))
return false;
}
template<typename T, typename T1, typename T2, typename T3>
T sendReceivePacket(const QString &name, const T1 &arg, const T2 &arg2, const T3 &arg3) const
{
writeData(name, arg, arg2, arg3);
while (m_socket->bytesToWrite())
m_socket->waitForBytesWritten();
return readData<T>(name);
}
template<typename T1, typename T2, typename T3>
void writeData(const QString &name, const T1 &arg, const T2 &arg2, const T3 &arg3) const
{
QByteArray data;
QDataStream out(&data, QIODevice::WriteOnly);
if (isValueType(arg))
out << arg;
if (isValueType(arg2))
out << arg2;
if (isValueType(arg3))
out << arg3;
sendPacket(m_socket, name.toLatin1(), data);
m_socket->flush();
}
template<typename T>
T readData(const QString &name) const
{
QByteArray command;
QByteArray data;
while (!receivePacket(m_socket, &command, &data)) {
if (!m_socket->waitForReadyRead(-1)) {
throw Error(tr("Cannot read all data after sending command: %1. "
"Bytes expected: %2, Bytes received: %3. Error: %4").arg(name).arg(0)
.arg(m_socket->bytesAvailable()).arg(m_socket->errorString()));
}
}
Q_ASSERT(command == Protocol::Reply);
QDataStream stream(&data, QIODevice::ReadOnly);
T result;
stream >> result;
Q_ASSERT(stream.status() == QDataStream::Ok);
Q_ASSERT(stream.atEnd());
return result;
}
private:
QString m_type;
QLocalSocket *m_socket;
};
} // namespace QInstaller
#endif // REMOTEOBJECT_H
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