#!/usr/bin/env python
 
 
#############################################################################
##
## Copyright (C) 2013 Riverbank Computing Limited.
## Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
## All rights reserved.
##
## This file is part of the examples of PyQt.
##
## $QT_BEGIN_LICENSE:BSD$
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##     the documentation and/or other materials provided with the
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#############################################################################
 
 
from PyQt5.QtCore import (pyqtSignal, QDataStream, QMutex, QMutexLocker,
        QThread, QWaitCondition)
from PyQt5.QtGui import QIntValidator
from PyQt5.QtWidgets import (QApplication, QDialogButtonBox, QGridLayout,
        QLabel, QLineEdit, QMessageBox, QPushButton, QWidget)
from PyQt5.QtNetwork import (QAbstractSocket, QHostAddress, QNetworkInterface,
        QTcpSocket)
 
 
class FortuneThread(QThread):
    newFortune = pyqtSignal(str)
 
    error = pyqtSignal(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_())