QTfrontend/net/tcpBase.cpp
author alfadur
Tue, 01 Feb 2022 20:58:35 +0300
changeset 15832 a4d505a32879
parent 15258 1ce9b717bb41
permissions -rw-r--r--
add back client timeouts
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/*
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 * Hedgewars, a free turn based strategy game
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 * Copyright (c) 2006-2007 Igor Ulyanov <iulyanov@gmail.com>
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 * Copyright (c) 2004-2015 Andrey Korotaev <unC0Rr@gmail.com>
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; version 2 of the License
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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 */
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#include <QList>
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#include <QImage>
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#include <QThread>
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#include <QApplication>
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#include <QProcessEnvironment>
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#include "tcpBase.h"
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#include "hwconsts.h"
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#include "MessageDialog.h"
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#include "gameuiconfig.h"
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#ifdef HWLIBRARY
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extern "C" {
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    void RunEngine(int argc, char ** argv);
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    int operatingsystem_parameter_argc;
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    char ** operatingsystem_parameter_argv;
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}
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EngineInstance::EngineInstance(QObject *parent)
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    : QObject(parent)
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{
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}
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EngineInstance::~EngineInstance()
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{
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    qDebug() << "EngineInstance delete" << QThread::currentThreadId();
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}
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void EngineInstance::setArguments(const QStringList & arguments)
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{
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    m_arguments.clear();
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    m_arguments << qApp->arguments().at(0).toUtf8();
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    m_argv.resize(arguments.size() + 1);
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    m_argv[0] = m_arguments.last().data();
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    int i = 1;
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    foreach(const QString & s, arguments)
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    {
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        m_arguments << s.toUtf8();
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        m_argv[i] = m_arguments.last().data();
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        ++i;
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    }
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}
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void EngineInstance::start()
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{
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    qDebug() << "EngineInstance start" << QThread::currentThreadId();
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    RunEngine(m_argv.size(), m_argv.data());
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    emit finished();
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}
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#endif
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QList<TCPBase*> srvsList;
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QPointer<QTcpServer> TCPBase::IPCServer(0);
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TCPBase::~TCPBase()
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{
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    if(m_hasStarted)
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    {
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        if(IPCSocket)
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            IPCSocket->close();
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        if(m_connected)
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        {
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#ifdef HWLIBRARY
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            if(!thread)
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                qDebug("WTF");
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            thread->quit();
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            thread->wait();
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#else
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            process->waitForFinished(1000);
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#endif
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        }
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    }
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    // make sure this object is not in the server list anymore
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    srvsList.removeOne(this);
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    if (IPCSocket)
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        IPCSocket->deleteLater();
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}
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TCPBase::TCPBase(bool demoMode, bool usesCustomLanguage, QObject *parent) :
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    QObject(parent),
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    m_hasStarted(false),
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    m_isDemoMode(demoMode),
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    m_connected(false),
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    m_usesCustomLanguage(usesCustomLanguage),
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    IPCSocket(0)
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{
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    process = 0;
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    if(!IPCServer)
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    {
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        IPCServer = new QTcpServer(0);
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        IPCServer->setMaxPendingConnections(1);
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        if (!IPCServer->listen(QHostAddress::LocalHost))
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        {
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            MessageDialog::ShowFatalMessage(tr("Unable to start server at %1.").arg(IPCServer->errorString()));
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            exit(0); // FIXME - should be graceful exit here (lower Critical -> Warning above when implemented)
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        }
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    }
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    ipc_port=IPCServer->serverPort();
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}
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void TCPBase::NewConnection()
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{
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    if(IPCSocket)
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    {
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        // connection should be already finished
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        return;
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    }
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    disconnect(IPCServer, SIGNAL(newConnection()), this, SLOT(NewConnection()));
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    IPCSocket = IPCServer->nextPendingConnection();
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    if(!IPCSocket) return;
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    m_connected = true;
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    connect(IPCSocket, SIGNAL(disconnected()), this, SLOT(ClientDisconnect()));
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    connect(IPCSocket, SIGNAL(readyRead()), this, SLOT(ClientRead()));
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    SendToClientFirst();
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    if(simultaneousRun())
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    {
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        srvsList.removeOne(this);
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        emit isReadyNow();
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    }
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}
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void TCPBase::RealStart()
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{
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    connect(IPCServer, SIGNAL(newConnection()), this, SLOT(NewConnection()));
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    IPCSocket = 0;
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#ifdef HWLIBRARY
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    thread = new QThread(this);
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    EngineInstance *instance = new EngineInstance();
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    instance->setArguments(getArguments());
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    instance->moveToThread(thread);
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    connect(thread, SIGNAL(started()), instance, SLOT(start(void)));
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    connect(instance, SIGNAL(finished()), thread, SLOT(quit()));
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    connect(instance, SIGNAL(finished()), instance, SLOT(deleteLater()));
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    connect(instance, SIGNAL(finished()), thread, SLOT(deleteLater()));
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    thread->start();
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#else
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    process = new QProcess(this);
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    connect(process, SIGNAL(error(QProcess::ProcessError)),
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        this, SLOT(StartProcessError(QProcess::ProcessError)));
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    connect(process, SIGNAL(finished(int, QProcess::ExitStatus)),
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        this, SLOT(onEngineDeath(int, QProcess::ExitStatus)));
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    QStringList arguments = getArguments();
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#ifdef QT_DEBUG
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    // redirect everything written on stdout/stderr
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    process->setProcessChannelMode(QProcess::ForwardedChannels);
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#endif
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    // If game config uses non-system locale, we set the environment
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    // of the engine first
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    if(m_usesCustomLanguage)
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    {
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        QProcessEnvironment env = QProcessEnvironment::systemEnvironment();
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        QString hwengineLang = QLocale().name() + ".UTF8";
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        qDebug("Setting hwengine environment: LANG=%s", qPrintable(hwengineLang));
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        // TODO: Check if this is correct and works on all systems
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        env.insert("LANG", QLocale().name() + ".UTF8");
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        process->setProcessEnvironment(env);
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    }
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    qDebug("Starting hwengine ...");
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    process->start(bindir->absolutePath() + "/hwengine", arguments);
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#endif
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    m_hasStarted = true;
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}
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void TCPBase::ClientDisconnect()
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{
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    onClientDisconnect();
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    if(!simultaneousRun())
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    {
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#ifdef HWLIBRARY
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        thread->quit();
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        thread->wait();
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#endif
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        emit isReadyNow();
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    }
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    if(IPCSocket) {
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      disconnect(IPCSocket, SIGNAL(readyRead()), this, SLOT(ClientRead()));
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      IPCSocket->deleteLater();
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      IPCSocket = NULL;
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    }
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    deleteLater();
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}
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void TCPBase::ClientRead()
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{
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    QByteArray read = IPCSocket->readAll();
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    if(read.isEmpty()) return;
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    readbuffer.append(read);
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    onClientRead();
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}
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void TCPBase::StartProcessError(QProcess::ProcessError error)
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{
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    MessageDialog::ShowFatalMessage(tr("Unable to run engine at %1\nError code: %2").arg(bindir->absolutePath() + "/hwengine").arg(error));
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    ClientDisconnect();
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}
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void TCPBase::onEngineDeath(int exitCode, QProcess::ExitStatus exitStatus)
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{
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    Q_UNUSED(exitStatus);
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    if(!m_connected) { // yes, it is intended to be like this
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      ClientDisconnect(); // need to do cleanup in case no connection occured,
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      //if m_connected is true, it is done automatically in socket disconnect handler
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    }
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    // show error message if there was an error that was not an engine's
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    // fatal error - because that one already sent a info via IPC
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    if ((exitCode != HWENGINE_EXITCODE_OK) && (exitCode != HWENGINE_EXITCODE_FATAL))
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    {
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        // inform user that something bad happened
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        MessageDialog::ShowFatalMessage(
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            tr("The game engine died unexpectedly!\n"
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            "(exit code %1)\n\n"
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            "We are very sorry for the inconvenience :(\n\n"
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            "If this keeps happening, please click the '%2' button in the main menu!")
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            .arg(exitCode)
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            .arg(QCoreApplication::translate("PageMain", "Feedback")));
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    }
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}
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void TCPBase::tcpServerReady()
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{
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    if (!srvsList.isEmpty())
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    {
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        disconnect(srvsList.first(), SIGNAL(isReadyNow()), this, SLOT(tcpServerReady()));
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        RealStart();
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    }
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    else
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    {
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        qDebug("tcpServerReady() called while srvsList was empty. Not starting TCP server");
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    }
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}
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void TCPBase::Start(bool couldCancelPreviousRequest)
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{
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    if(srvsList.isEmpty())
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    {
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        srvsList.push_back(this);
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        RealStart();
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    }
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    else
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    {
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        TCPBase * last = srvsList.last();
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        if(couldCancelPreviousRequest
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            && last->couldBeRemoved()
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            && (last->isConnected() || !last->hasStarted())
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            && (last->parent() == parent()))
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        {
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            srvsList.removeLast();
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            delete last;
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            Start(couldCancelPreviousRequest);
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        } else
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        {
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            connect(last, SIGNAL(isReadyNow()), this, SLOT(tcpServerReady()));
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            srvsList.push_back(this);
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        }
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    }
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}
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void TCPBase::onClientRead()
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{
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}
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void TCPBase::onClientDisconnect()
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{
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}
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void TCPBase::SendToClientFirst()
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{
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}
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void TCPBase::SendIPC(const QByteArray & buf)
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{
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    if (buf.size() > MAXMSGCHARS) return;
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    quint8 len = buf.size();
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    RawSendIPC(QByteArray::fromRawData((char *)&len, 1) + buf);
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}
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void TCPBase::RawSendIPC(const QByteArray & buf)
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{
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    if (!IPCSocket)
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    {
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        toSendBuf += buf;
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    }
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    else
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    {
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        if (toSendBuf.size() > 0)
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        {
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            IPCSocket->write(toSendBuf);
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            if(m_isDemoMode) demo.append(toSendBuf);
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            toSendBuf.clear();
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        }
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        if(!buf.isEmpty())
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        {
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            IPCSocket->write(buf);
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            if(m_isDemoMode) demo.append(buf);
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        }
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    }
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}
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bool TCPBase::couldBeRemoved()
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{
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    return false;
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}
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bool TCPBase::isConnected()
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{
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    return m_connected;
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}
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bool TCPBase::simultaneousRun()
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{
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    return false;
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}
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bool TCPBase::hasStarted()
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{
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    return m_hasStarted;
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}