Add new Ebike demo to basicsuite

Task-number: QTBUG-67917
Change-Id: I88e783ff7bcc530b13edfd3e21565953433293dc
Reviewed-by: Teemu Holappa <teemu.holappa@qt.io>

1 files changed, 152 insertions, 0 deletions

diff --git a/basicsuite/ebike-ui/socketclient.cpp b/basicsuite/ebike-ui/socketclient.cpp
new file mode 100644
index 0000000..d40d268
--- /dev/null
+++ b/basicsuite/ebike-ui/socketclient.cpp
@@ -0,0 +1,152 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the E-Bike demo project.
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** 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 <QDataStream>
+#include <QJsonDocument>
+
+#include "socketclient.h"
+
+SocketClient::SocketClient(QObject *parent)
+    : QObject(parent)
+    , m_socket(new QLocalSocket(this))
+{
+    // Connect socket signals
+    connect(m_socket, &QLocalSocket::connected, this, &SocketClient::connected);
+    connect(m_socket, &QLocalSocket::disconnected, this, &SocketClient::disconnected);
+    connect(m_socket, &QLocalSocket::readyRead, this, &SocketClient::readyRead);
+
+    // Setup timer to try to reconnect after disconnect
+    m_connectionTimer.setInterval(5000);
+    connect(&m_connectionTimer, &QTimer::timeout, this, &SocketClient::reconnect);
+    connect(m_socket, &QLocalSocket::connected, &m_connectionTimer, &QTimer::stop);
+    connect(m_socket, &QLocalSocket::disconnected,
+            &m_connectionTimer, static_cast<void (QTimer::*)()>(&QTimer::start));
+    connect(m_socket,  static_cast<void(QLocalSocket::*)(QLocalSocket::LocalSocketError)>(&QLocalSocket::error),
+            &m_connectionTimer, static_cast<void (QTimer::*)()>(&QTimer::start));
+}
+
+void SocketClient::connectToServer(const QString &servername)
+{
+    m_servername = servername;
+    reconnect();
+}
+
+void SocketClient::reconnect()
+{
+    qDebug("Connecting to server...");
+    m_socket->connectToServer(m_servername);
+}
+
+qint64 SocketClient::write(const QByteArray &data)
+{
+    return m_socket->write(data);
+}
+
+/**
+ * @brief send a QByteArray to the server
+ * @param message
+ *
+ * Adds the length of the message as a header and sends the message to the server.
+ */
+void SocketClient::sendToServer(const QByteArray &message)
+{
+    // Prepend the message length
+    QByteArray data;
+    QDataStream stream(&data, QIODevice::WriteOnly);
+    stream << static_cast<qint32>(message.size() + 4);
+    data.append(message);
+
+    write(data);
+}
+
+/**
+ * @brief send a Json object to the server
+ * @param message
+ *
+ * Sends a QJsonObject object to the server, encoded in Qt's internal binary format.
+ */
+void SocketClient::sendToServer(const QJsonObject &message)
+{
+    QJsonDocument doc(message);
+    sendToServer(doc.toBinaryData());
+}
+
+/**
+ * @brief reads incoming data from the server
+ *
+ * Parses only message headers and body as QByteArray, but does not care about
+ * the contents. All complete messages are processed at @see parseMessage.
+ */
+void SocketClient::readyRead()
+{
+    m_data += m_socket->readAll();
+
+    bool messagefound = true;
+    while (messagefound) {
+        messagefound = false;
+        // If we have at least some data
+        if (m_data.size() >= 4) {
+            // Extract message size
+            qint32 messagesize;
+            QDataStream stream(m_data.left(4));
+            stream >> messagesize;
+
+            // If we have enough data for at least one message
+            if (m_data.size() >= messagesize) {
+                // Extract actual message
+                QByteArray message = m_data.mid(4, messagesize - 4);
+                parseMessage(message);
+                // Drop necessary amount of bytes
+                m_data = m_data.mid(messagesize);
+                messagefound = true; // Try to parse another message
+            }
+        }
+    }
+}
+
+/**
+ * @brief parse the contents of a QByteArray
+ * @param message
+ *
+ * Contents are parsed from QJsonDocument's binary data. This separation allows
+ * the format to be changed later on, if need be.
+ */
+void SocketClient::parseMessage(const QByteArray &message)
+{
+    // Parse message from raw format
+    QJsonDocument doc = QJsonDocument::fromBinaryData(message);
+    emit newMessage(doc.object());
+}