Revision control
++ // Copyright (C) 2016 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
++ // Qt-Security score:significant
++
++ #include "qdebugmessageservice.h"
++
++ #include <private/qqmldebugconnector_p.h>
++ #include <private/qversionedpacket_p.h>
++
++ QT_BEGIN_NAMESPACE
++
++ using QQmlDebugPacket = QVersionedPacket<QQmlDebugConnector>;
++
++ void DebugMessageHandler(QtMsgType type, const QMessageLogContext &ctxt,
++ const QString &buf)
++ {
++ if (QDebugMessageServiceImpl *service = QQmlDebugConnector::service<QDebugMessageServiceImpl>())
++ service->sendDebugMessage(type, ctxt, buf);
++ }
++
++ QDebugMessageServiceImpl::QDebugMessageServiceImpl(QObject *parent) :
++ QDebugMessageService(2, parent), oldMsgHandler(nullptr),
++ prevState(QQmlDebugService::NotConnected)
++ {
++ // don't execute stateChanged() in parallel
++ QMutexLocker lock(&initMutex);
++ timer.start();
++ if (state() == Enabled) {
++ oldMsgHandler = qInstallMessageHandler(DebugMessageHandler);
++ prevState = Enabled;
++ }
++ }
++
++ QDebugMessageServiceImpl::~QDebugMessageServiceImpl()
++ {
++ if (oldMsgHandler)
++ restoreOldMessageHandler();
++ }
++
++ void QDebugMessageServiceImpl::sendDebugMessage(QtMsgType type,
++ const QMessageLogContext &ctxt,
++ const QString &buf)
++ {
++ //We do not want to alter the message handling mechanism
++ //We just eavesdrop and forward the messages to a port
++ //only if a client is connected to it.
++ QQmlDebugPacket ws;
++ ws << QByteArray("MESSAGE") << int(type) << buf.toUtf8();
++ ws << QByteArray(ctxt.file) << ctxt.line << QByteArray(ctxt.function);
++ ws << QByteArray(ctxt.category) << timer.nsecsElapsed();
++
++ emit messageToClient(name(), ws.data());
++ if (oldMsgHandler)
++ (*oldMsgHandler)(type, ctxt, buf);
++ }
++
++ void QDebugMessageServiceImpl::stateChanged(State state)
++ {
++ QMutexLocker lock(&initMutex);
++
++ if (state != Enabled && prevState == Enabled)
++ restoreOldMessageHandler();
++ else if (state == Enabled && prevState != Enabled)
++ oldMsgHandler = qInstallMessageHandler(DebugMessageHandler);
++
++ prevState = state;
++ }
++
++ void QDebugMessageServiceImpl::restoreOldMessageHandler()
++ {
++ QtMessageHandler handler = qInstallMessageHandler(oldMsgHandler);
++
++ // has our handler been overwritten in between?
++ // In that case, leave the other one alone and try again on destruction.
++ if (handler == DebugMessageHandler)
++ oldMsgHandler = nullptr;
++ else
++ qInstallMessageHandler(handler);
++ }
++
++ void QDebugMessageServiceImpl::synchronizeTime(const QElapsedTimer &otherTimer)
++ {
++ QMutexLocker lock(&initMutex);
++ timer = otherTimer;
++ }
++
++ QT_END_NAMESPACE
++
++ #include "moc_qdebugmessageservice.cpp"