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Diffstat (limited to 'examples/webchannel/standalone/websockettransport.py')
| -rw-r--r-- | examples/webchannel/standalone/websockettransport.py | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/examples/webchannel/standalone/websockettransport.py b/examples/webchannel/standalone/websockettransport.py new file mode 100644 index 000000000..4e42e7674 --- /dev/null +++ b/examples/webchannel/standalone/websockettransport.py @@ -0,0 +1,88 @@ +############################################################################# +## +## Copyright (C) 2017 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Milian Wolff <milian.wolff@kdab.com> +## Copyright (C) 2020 The Qt Company Ltd. +## Contact: http://www.qt.io/licensing/ +## +## This file is part of the Qt for Python examples of the Qt Toolkit. +## +## $QT_BEGIN_LICENSE:BSD$ +## You may use this file under the terms of the BSD license as follows: +## +## "Redistribution and use in source and binary forms, with or without +## modification, are permitted provided that the following conditions are +## met: +## * Redistributions of source code must retain the above copyright +## notice, this list of conditions and the following disclaimer. +## * Redistributions in binary form must reproduce the above copyright +## notice, this list of conditions and the following disclaimer in +## the documentation and/or other materials provided with the +## distribution. +## * Neither the name of The Qt Company Ltd nor the names of its +## contributors may be used to endorse or promote products derived +## from this software without specific prior written permission. +## +## +## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." +## +## $QT_END_LICENSE$ +## +############################################################################# + +from PySide2.QtWebChannel import QWebChannelAbstractTransport +from PySide2.QtCore import QByteArray, QJsonDocument, Slot + + +class WebSocketTransport(QWebChannelAbstractTransport): + """QWebChannelAbstractSocket implementation using a QWebSocket internally. + + The transport delegates all messages received over the QWebSocket over + its textMessageReceived signal. Analogously, all calls to + sendTextMessage will be sent over the QWebSocket to the remote client. + """ + + def __init__(self, socket): + """Construct the transport object and wrap the given socket. + The socket is also set as the parent of the transport object.""" + super(WebSocketTransport, self).__init__(socket) + self._socket = socket + self._socket.textMessageReceived.connect(self.textMessageReceived) + self._socket.disconnected.connect(self._disconnected) + + def __del__(self): + """Destroys the WebSocketTransport.""" + self._socket.deleteLater() + + def _disconnected(self): + self.deleteLater() + + def sendMessage(self, message): + """Serialize the JSON message and send it as a text message via the + WebSocket to the client.""" + doc = QJsonDocument(message) + json_message = str(doc.toJson(QJsonDocument.Compact), "utf-8") + self._socket.sendTextMessage(json_message) + + @Slot(str) + def textMessageReceived(self, message_data_in): + """Deserialize the stringified JSON messageData and emit + messageReceived.""" + message_data = QByteArray(bytes(message_data_in, encoding='utf8')) + message = QJsonDocument.fromJson(message_data) + if message.isNull(): + print("Failed to parse text message as JSON object:", message_data) + return + if not message.isObject(): + print("Received JSON message that is not an object: ", message_data) + return + self.messageReceived.emit(message.object(), self) |