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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include "dialog.h"
#include <QtNetwork>
#include <QtWidgets>
static const int TotalBytes = 50 * 1024 * 1024;
static const int PayloadSize = 64 * 1024; // 64 KB
Dialog::Dialog(QWidget *parent)
: QDialog(parent)
{
clientProgressBar = new QProgressBar;
clientStatusLabel = new QLabel(tr("Client ready"));
serverProgressBar = new QProgressBar;
serverStatusLabel = new QLabel(tr("Server ready"));
startButton = new QPushButton(tr("&Start"));
quitButton = new QPushButton(tr("&Quit"));
buttonBox = new QDialogButtonBox;
buttonBox->addButton(startButton, QDialogButtonBox::ActionRole);
buttonBox->addButton(quitButton, QDialogButtonBox::RejectRole);
connect(startButton, &QAbstractButton::clicked, this, &Dialog::start);
connect(quitButton, &QAbstractButton::clicked, this, &QWidget::close);
connect(&tcpServer, &QTcpServer::newConnection,
this, &Dialog::acceptConnection);
connect(&tcpClient, &QAbstractSocket::connected, this, &Dialog::startTransfer);
connect(&tcpClient, &QIODevice::bytesWritten,
this, &Dialog::updateClientProgress);
connect(&tcpClient, &QAbstractSocket::errorOccurred,
this, &Dialog::displayError);
QVBoxLayout *mainLayout = new QVBoxLayout;
mainLayout->addWidget(clientProgressBar);
mainLayout->addWidget(clientStatusLabel);
mainLayout->addWidget(serverProgressBar);
mainLayout->addWidget(serverStatusLabel);
mainLayout->addStretch(1);
mainLayout->addSpacing(10);
mainLayout->addWidget(buttonBox);
setLayout(mainLayout);
setWindowTitle(tr("Loopback"));
}
void Dialog::start()
{
startButton->setEnabled(false);
#ifndef QT_NO_CURSOR
QGuiApplication::setOverrideCursor(Qt::WaitCursor);
#endif
bytesWritten = 0;
bytesReceived = 0;
while (!tcpServer.isListening() && !tcpServer.listen()) {
QMessageBox::StandardButton ret = QMessageBox::critical(this,
tr("Loopback"),
tr("Unable to start the test: %1.")
.arg(tcpServer.errorString()),
QMessageBox::Retry
| QMessageBox::Cancel);
if (ret == QMessageBox::Cancel)
return;
}
serverStatusLabel->setText(tr("Listening"));
clientStatusLabel->setText(tr("Connecting"));
tcpClient.connectToHost(QHostAddress::LocalHost, tcpServer.serverPort());
}
void Dialog::acceptConnection()
{
tcpServerConnection = tcpServer.nextPendingConnection();
if (!tcpServerConnection) {
serverStatusLabel->setText(tr("Error: got invalid pending connection!"));
return;
}
connect(tcpServerConnection, &QIODevice::readyRead,
this, &Dialog::updateServerProgress);
connect(tcpServerConnection, &QAbstractSocket::errorOccurred,
this, &Dialog::displayError);
connect(tcpServerConnection, &QTcpSocket::disconnected,
tcpServerConnection, &QTcpSocket::deleteLater);
serverStatusLabel->setText(tr("Accepted connection"));
tcpServer.close();
}
void Dialog::startTransfer()
{
// called when the TCP client connected to the loopback server
bytesToWrite = TotalBytes - int(tcpClient.write(QByteArray(PayloadSize, '@')));
clientStatusLabel->setText(tr("Connected"));
}
void Dialog::updateServerProgress()
{
bytesReceived += int(tcpServerConnection->bytesAvailable());
tcpServerConnection->readAll();
serverProgressBar->setMaximum(TotalBytes);
serverProgressBar->setValue(bytesReceived);
serverStatusLabel->setText(tr("Received %1MB")
.arg(bytesReceived / (1024 * 1024)));
if (bytesReceived == TotalBytes) {
tcpServerConnection->close();
startButton->setEnabled(true);
#ifndef QT_NO_CURSOR
QGuiApplication::restoreOverrideCursor();
#endif
}
}
void Dialog::updateClientProgress(qint64 numBytes)
{
// called when the TCP client has written some bytes
bytesWritten += int(numBytes);
// only write more if not finished and when the Qt write buffer is below a certain size.
if (bytesToWrite > 0 && tcpClient.bytesToWrite() <= 4 * PayloadSize)
bytesToWrite -= tcpClient.write(QByteArray(qMin(bytesToWrite, PayloadSize), '@'));
clientProgressBar->setMaximum(TotalBytes);
clientProgressBar->setValue(bytesWritten);
clientStatusLabel->setText(tr("Sent %1MB").arg(bytesWritten / (1024 * 1024)));
}
void Dialog::displayError(QAbstractSocket::SocketError socketError)
{
if (socketError == QTcpSocket::RemoteHostClosedError)
return;
QMessageBox::information(this, tr("Network error"),
tr("The following error occurred: %1.")
.arg(tcpClient.errorString()));
tcpClient.close();
tcpServer.close();
clientProgressBar->reset();
serverProgressBar->reset();
clientStatusLabel->setText(tr("Client ready"));
serverStatusLabel->setText(tr("Server ready"));
startButton->setEnabled(true);
#ifndef QT_NO_CURSOR
QGuiApplication::restoreOverrideCursor();
#endif
}
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