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/****************************************************************************
**
** Copyright (C) 2016 basysKom GmbH, opensource@basyskom.com
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtOpcUa module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL3$
** 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 http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/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 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPLv3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or later 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 2.0 requirements will be
** met: http://www.gnu.org/licenses/gpl-2.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <private/qopcuaclient_p.h>
#include <QtCore/qloggingcategory.h>
QT_BEGIN_NAMESPACE
Q_DECLARE_LOGGING_CATEGORY(QT_OPCUA)
QOpcUaClientPrivate::QOpcUaClientPrivate(QOpcUaClientImpl *impl)
: QObjectPrivate()
, m_impl(impl)
, m_state(QOpcUaClient::Disconnected)
, m_error(QOpcUaClient::NoError)
{
// callback from client implementation
QObject::connect(m_impl.data(), &QOpcUaClientImpl::stateAndOrErrorChanged,
[this](QOpcUaClient::ClientState state, QOpcUaClient::ClientError error) {
setStateAndError(state, error);
});
}
QOpcUaClientPrivate::~QOpcUaClientPrivate()
{
}
void QOpcUaClientPrivate::connectToEndpoint(const QUrl &url)
{
bool result = checkAndSetUrl(url);
if (result) {
setStateAndError(QOpcUaClient::Connecting);
m_impl->connectToEndpoint(url);
} else {
setStateAndError(QOpcUaClient::Disconnected, QOpcUaClient::InvalidUrl);
}
}
void QOpcUaClientPrivate::disconnectFromEndpoint()
{
if (m_state != QOpcUaClient::Connected) {
qCWarning(QT_OPCUA) << "Closing a connection without being connected";
return;
}
setStateAndError(QOpcUaClient::Closing);
m_impl->disconnectFromEndpoint();
}
bool QOpcUaClientPrivate::checkAndSetUrl(const QUrl &url)
{
if (url.scheme() != QStringLiteral("opc.tcp")) {
qCWarning(QT_OPCUA) << "Wrong url scheme, could not connect";
return false;
}
m_url = url;
return true;
}
void QOpcUaClientPrivate::setStateAndError(QOpcUaClient::ClientState state,
QOpcUaClient::ClientError error)
{
Q_Q(QOpcUaClient);
// ensure that state and error transition are atomic before signal emission
bool stateChanged = false;
bool errorOccurred = false;
if (m_state != state) {
m_state = state;
stateChanged = true;
}
if (error != QOpcUaClient::NoError && m_error != error) {
errorOccurred = true;
}
m_error = error;
if (errorOccurred)
emit q->errorChanged(m_error);
if (stateChanged) {
emit q->stateChanged(m_state);
if (m_state == QOpcUaClient::Connected)
emit q->connected();
else if (m_state == QOpcUaClient::Disconnected)
emit q->disconnected();
}
// According to UPC-UA part 5, page 23, the server is allowed to change entries of the namespace
// array if there is no active session. This could invalidate the cached namespaces table.
if (state == QOpcUaClient::Disconnected) {
m_namespaceArray.clear();
}
}
bool QOpcUaClientPrivate::updateNamespaceArray()
{
if (m_state != QOpcUaClient::ClientState::Connected)
return false;
if (!m_namespaceArrayNode) {
m_namespaceArrayNode.reset(m_impl->node(QStringLiteral("ns=0;i=2255")));
if (!m_namespaceArrayNode)
return false;
QObjectPrivate::connect(m_namespaceArrayNode.data(), &QOpcUaNode::attributeRead, this, &QOpcUaClientPrivate::namespaceArrayUpdated);
}
return m_namespaceArrayNode->readAttributes(QOpcUa::NodeAttribute::Value);
}
QStringList QOpcUaClientPrivate::namespaceArray() const
{
return m_namespaceArray;
}
void QOpcUaClientPrivate::namespaceArrayUpdated(QOpcUa::NodeAttributes attr)
{
Q_Q(QOpcUaClient);
const QVariant value = m_namespaceArrayNode->attribute(QOpcUa::NodeAttribute::Value);
if (!(attr & QOpcUa::NodeAttribute::Value) || value.type() != QVariant::Type::List) {
m_namespaceArray.clear();
emit q->namespaceArrayUpdated(QStringList());
return;
}
m_namespaceArray.clear();
for (auto it : value.toList())
m_namespaceArray.append(it.toString());
emit q->namespaceArrayUpdated(m_namespaceArray);
}
QT_END_NAMESPACE
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