fortuneserver¶

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fortuneserver.py
# Copyright (C) 2013 Riverbank Computing Limited.
# Copyright (C) 2022 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
from __future__ import annotations

"""PySide6 port of the network/fortuneserver example from Qt v5.x"""

import random
import sys

from PySide6.QtCore import QByteArray, QDataStream, QIODevice, Qt
from PySide6.QtNetwork import QTcpServer
from PySide6.QtWidgets import (QApplication, QDialog, QHBoxLayout,
                               QLabel, QMessageBox, QPushButton,
                               QVBoxLayout)


class Server(QDialog):
    def __init__(self, parent=None):
        super().__init__(parent)

        status_label = QLabel()
        status_label.setTextInteractionFlags(Qt.TextBrowserInteraction)
        quit_button = QPushButton("Quit")
        quit_button.setAutoDefault(False)

        self._tcp_server = QTcpServer(self)
        if not self._tcp_server.listen():
            reason = self._tcp_server.errorString()
            QMessageBox.critical(self, "Fortune Server",
                                 f"Unable to start the server: {reason}.")
            self.close()
            return
        port = self._tcp_server.serverPort()
        status_label.setText(f"The server is running on port {port}.\nRun the "
                             "Fortune Client example now.")

        self.fortunes = (
            "You've been leading a dog's life. Stay off the furniture.",
            "You've got to think about tomorrow.",
            "You will be surprised by a loud noise.",
            "You will feel hungry again in another hour.",
            "You might have mail.",
            "You cannot kill time without injuring eternity.",
            "Computers are not intelligent. They only think they are.")

        quit_button.clicked.connect(self.close)
        self._tcp_server.newConnection.connect(self.send_fortune)

        button_layout = QHBoxLayout()
        button_layout.addStretch(1)
        button_layout.addWidget(quit_button)
        button_layout.addStretch(1)

        main_layout = QVBoxLayout(self)
        main_layout.addWidget(status_label)
        main_layout.addLayout(button_layout)

        self.setWindowTitle("Fortune Server")

    def send_fortune(self):
        block = QByteArray()
        out = QDataStream(block, QIODevice.WriteOnly)
        out.setVersion(QDataStream.Qt_4_0)
        out.writeUInt16(0)
        fortune = self.fortunes[random.randint(0, len(self.fortunes) - 1)]

        out.writeString(fortune)
        out.device().seek(0)
        out.writeUInt16(block.size() - 2)

        client_connection = self._tcp_server.nextPendingConnection()
        client_connection.disconnected.connect(client_connection.deleteLater)

        client_connection.write(block)
        client_connection.disconnectFromHost()


if __name__ == '__main__':
    app = QApplication(sys.argv)
    server = Server()
    random.seed(None)
    sys.exit(server.exec())