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Diffstat (limited to 'examples/network/blockingfortuneclient.py')
| -rw-r--r-- | examples/network/blockingfortuneclient.py | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/examples/network/blockingfortuneclient.py b/examples/network/blockingfortuneclient.py new file mode 100644 index 000000000..8e73af0f0 --- /dev/null +++ b/examples/network/blockingfortuneclient.py @@ -0,0 +1,225 @@ +#!/usr/bin/env python + +############################################################################# +## +## Copyright (C) 2013 Riverbank Computing Limited. +## Copyright (C) 2016 The Qt Company Ltd. +## Contact: http://www.qt.io/licensing/ +## +## This file is part of the PySide 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." +## +## $QT_END_LICENSE$ +## +############################################################################# + +"""PySide2 port of the network/blockingfortunclient example from Qt v5.x, originating from PyQt""" + +from PySide2.QtCore import (Signal, QDataStream, QMutex, QMutexLocker, + QThread, QWaitCondition) +from PySide2.QtGui import QIntValidator +from PySide2.QtWidgets import (QApplication, QDialogButtonBox, QGridLayout, + QLabel, QLineEdit, QMessageBox, QPushButton, QWidget) +from PySide2.QtNetwork import (QAbstractSocket, QHostAddress, QNetworkInterface, + QTcpSocket) + + +class FortuneThread(QThread): + newFortune = Signal(str) + + error = Signal(int, str) + + def __init__(self, parent=None): + super(FortuneThread, self).__init__(parent) + + self.quit = False + self.hostName = '' + self.cond = QWaitCondition() + self.mutex = QMutex() + self.port = 0 + + def __del__(self): + self.mutex.lock() + self.quit = True + self.cond.wakeOne() + self.mutex.unlock() + self.wait() + + def requestNewFortune(self, hostname, port): + locker = QMutexLocker(self.mutex) + self.hostName = hostname + self.port = port + if not self.isRunning(): + self.start() + else: + self.cond.wakeOne() + + def run(self): + self.mutex.lock() + serverName = self.hostName + serverPort = self.port + self.mutex.unlock() + + while not self.quit: + Timeout = 5 * 1000 + + socket = QTcpSocket() + socket.connectToHost(serverName, serverPort) + + if not socket.waitForConnected(Timeout): + self.error.emit(socket.error(), socket.errorString()) + return + + while socket.bytesAvailable() < 2: + if not socket.waitForReadyRead(Timeout): + self.error.emit(socket.error(), socket.errorString()) + return + + instr = QDataStream(socket) + instr.setVersion(QDataStream.Qt_4_0) + blockSize = instr.readUInt16() + + while socket.bytesAvailable() < blockSize: + if not socket.waitForReadyRead(Timeout): + self.error.emit(socket.error(), socket.errorString()) + return + + self.mutex.lock() + fortune = instr.readQString() + self.newFortune.emit(fortune) + + self.cond.wait(self.mutex) + serverName = self.hostName + serverPort = self.port + self.mutex.unlock() + + +class BlockingClient(QWidget): + def __init__(self, parent=None): + super(BlockingClient, self).__init__(parent) + + self.thread = FortuneThread() + self.currentFortune = '' + + hostLabel = QLabel("&Server name:") + portLabel = QLabel("S&erver port:") + + for ipAddress in QNetworkInterface.allAddresses(): + if ipAddress != QHostAddress.LocalHost and ipAddress.toIPv4Address() != 0: + break + else: + ipAddress = QHostAddress(QHostAddress.LocalHost) + + ipAddress = ipAddress.toString() + + self.hostLineEdit = QLineEdit(ipAddress) + self.portLineEdit = QLineEdit() + self.portLineEdit.setValidator(QIntValidator(1, 65535, self)) + + hostLabel.setBuddy(self.hostLineEdit) + portLabel.setBuddy(self.portLineEdit) + + self.statusLabel = QLabel( + "This example requires that you run the Fortune Server example as well.") + self.statusLabel.setWordWrap(True) + + self.getFortuneButton = QPushButton("Get Fortune") + self.getFortuneButton.setDefault(True) + self.getFortuneButton.setEnabled(False) + + quitButton = QPushButton("Quit") + + buttonBox = QDialogButtonBox() + buttonBox.addButton(self.getFortuneButton, QDialogButtonBox.ActionRole) + buttonBox.addButton(quitButton, QDialogButtonBox.RejectRole) + + self.getFortuneButton.clicked.connect(self.requestNewFortune) + quitButton.clicked.connect(self.close) + self.hostLineEdit.textChanged.connect(self.enableGetFortuneButton) + self.portLineEdit.textChanged.connect(self.enableGetFortuneButton) + self.thread.newFortune.connect(self.showFortune) + self.thread.error.connect(self.displayError) + + mainLayout = QGridLayout() + mainLayout.addWidget(hostLabel, 0, 0) + mainLayout.addWidget(self.hostLineEdit, 0, 1) + mainLayout.addWidget(portLabel, 1, 0) + mainLayout.addWidget(self.portLineEdit, 1, 1) + mainLayout.addWidget(self.statusLabel, 2, 0, 1, 2) + mainLayout.addWidget(buttonBox, 3, 0, 1, 2) + self.setLayout(mainLayout) + + self.setWindowTitle("Blocking Fortune Client") + self.portLineEdit.setFocus() + + def requestNewFortune(self): + self.getFortuneButton.setEnabled(False) + self.thread.requestNewFortune(self.hostLineEdit.text(), + int(self.portLineEdit.text())) + + def showFortune(self, nextFortune): + if nextFortune == self.currentFortune: + self.requestNewFortune() + return + + self.currentFortune = nextFortune + self.statusLabel.setText(self.currentFortune) + self.getFortuneButton.setEnabled(True) + + def displayError(self, socketError, message): + if socketError == QAbstractSocket.HostNotFoundError: + QMessageBox.information(self, "Blocking Fortune Client", + "The host was not found. Please check the host and port " + "settings.") + elif socketError == QAbstractSocket.ConnectionRefusedError: + QMessageBox.information(self, "Blocking Fortune Client", + "The connection was refused by the peer. Make sure the " + "fortune server is running, and check that the host name " + "and port settings are correct.") + else: + QMessageBox.information(self, "Blocking Fortune Client", + "The following error occurred: %s." % message) + + self.getFortuneButton.setEnabled(True) + + def enableGetFortuneButton(self): + self.getFortuneButton.setEnabled(self.hostLineEdit.text() != '' and + self.portLineEdit.text() != '') + + +if __name__ == '__main__': + + import sys + + app = QApplication(sys.argv) + client = BlockingClient() + client.show() + sys.exit(app.exec_()) |