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# Copyright (C) 2022 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
from PySide6.QtCore import QByteArray, Qt
from PySide6.QtGui import QGuiApplication
from PySide6.QtNetwork import (QAbstractSocket, QHostAddress, QTcpServer,
QTcpSocket)
from PySide6.QtWidgets import (QDialog, QDialogButtonBox, QLabel, QMessageBox,
QProgressBar, QPushButton, QVBoxLayout)
class Dialog(QDialog):
def __init__(self, parent=None):
super().__init__(parent)
self.total_bytes = 50 * 1024 * 1024 # 50 MB
self.payload_size = 64 * 1024 # 64 KB
self.bytes_to_write = 0
self.bytes_written = 0
self.bytes_received = 0
self.client_progress_bar = QProgressBar()
self.client_status_label = QLabel("Client ready")
self.server_progress_bar = QProgressBar()
self.server_status_label = QLabel("Server ready")
self.start_button = QPushButton("&Start")
self.quit_button = QPushButton("&Quit")
self.button_box = QDialogButtonBox()
self.button_box.addButton(self.start_button, QDialogButtonBox.ActionRole)
self.button_box.addButton(self.quit_button, QDialogButtonBox.RejectRole)
self.start_button.clicked.connect(self.start)
self.quit_button.clicked.connect(self.close)
self.tcp_server = QTcpServer()
self.tcp_client = QTcpSocket()
self.tcp_server.newConnection.connect(self.accept_connection)
self.tcp_client.connected.connect(self.start_transfer)
self.tcp_client.bytesWritten.connect(self.update_client_progress)
self.tcp_client.errorOccurred.connect(self.display_error)
main_layout = QVBoxLayout()
main_layout.addWidget(self.client_progress_bar)
main_layout.addWidget(self.client_status_label)
main_layout.addWidget(self.server_progress_bar)
main_layout.addWidget(self.server_status_label)
main_layout.addStretch(1)
main_layout.addSpacing(10)
main_layout.addWidget(self.button_box)
self.setLayout(main_layout)
self.setWindowTitle("Loopback")
def start(self):
self.start_button.setEnabled(False)
QGuiApplication.setOverrideCursor(Qt.WaitCursor)
self.bytes_written = 0
self.bytes_received = 0
while not self.tcp_server.isListening() and not self.tcp_server.listen():
ret: QMessageBox.StandardButton = QMessageBox.critical(
self,
"Loopback",
f"Unable to start the test {self.tcp_server.errorString()}",
QMessageBox.Retry | QMessageBox.Cancel,
)
if ret == QMessageBox.Cancel:
return
self.server_status_label.setText("Listening")
self.client_status_label.setText("Connecting")
self.tcp_client.connectToHost(QHostAddress.LocalHost, self.tcp_server.serverPort())
def accept_connection(self):
self.tcp_server_connection = self.tcp_server.nextPendingConnection()
if not self.tcp_server_connection:
self.server_status_label.setText("Error: got invalid pending connection")
return
self.tcp_server_connection.readyRead.connect(self.update_server_progress)
self.tcp_server_connection.errorOccurred.connect(self.display_error)
self.tcp_server_connection.disconnected.connect(self.tcp_server_connection.deleteLater)
self.server_status_label.setText("Accepted connection")
self.tcp_server.close()
def start_transfer(self):
# Called when the TCP client has connected to the loopback server
self.bytes_to_write = self.total_bytes - self.tcp_client.write(
QByteArray(self.payload_size, "@")
)
self.client_status_label.setText("Connected")
def update_server_progress(self):
self.bytes_received += self.tcp_server_connection.bytesAvailable()
self.tcp_server_connection.readAll()
self.server_progress_bar.setMaximum(self.total_bytes)
self.server_progress_bar.setValue(self.bytes_received)
self.server_status_label.setText(f"Received {self.bytes_received / (1024 ** 2)} MB")
if self.bytes_received == self.total_bytes:
self.tcp_server_connection.close()
self.start_button.setEnabled(True)
QGuiApplication.restoreOverrideCursor()
def update_client_progress(self, num_bytes: int):
# called when the TCP client has written some bytes
self.bytes_written += num_bytes
# only write more if not finished and when the Qt write buffer is below a certain size
if self.bytes_to_write > 0 and self.tcp_client.bytesToWrite() <= 4 * self.payload_size:
self.bytes_to_write -= self.tcp_client.write(
QByteArray(min(self.bytes_to_write, self.payload_size), "@")
)
self.client_progress_bar.setMaximum(self.total_bytes)
self.client_progress_bar.setValue(self.bytes_written)
self.client_status_label.setText(f"Sent {self.bytes_written / (1024 ** 2)} MB")
def display_error(self, socket_error: QAbstractSocket.SocketError):
if socket_error == QAbstractSocket.RemoteHostClosedError:
return
QMessageBox.information(
self,
"Network error",
f"The following error occurred: {self.tcp_client.errorString()}",
)
self.tcp_client.close()
self.tcp_server.close()
self.client_progress_bar.reset()
self.server_progress_bar.reset()
self.client_status_label.setText("Client ready")
self.server_status_label.setText("Server ready")
self.start_button.setEnabled(True)
QGuiApplication.restoreOverrideCursor()
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