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// Copyright (C) 2017 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0 WITH Qt-GPL-exception-1.0
#include "qmldebugconnectionmanager.h"
#include "qmldebugconnection.h"
#include <utils/qtcassert.h>
#include <utils/url.h>
namespace QmlDebug {
QmlDebugConnectionManager::QmlDebugConnectionManager(QObject *parent) : QObject(parent)
{
}
QmlDebugConnectionManager::~QmlDebugConnectionManager()
{
// Don't receive any signals from the dtors of child objects while our own dtor is running.
// That can lead to invalid reads.
if (m_connection)
disconnectConnectionSignals();
}
void QmlDebugConnectionManager::connectToServer(const QUrl &server)
{
if (m_server != server) {
m_server = server;
destroyConnection();
stopConnectionTimer();
}
if (server.scheme() == Utils::urlTcpScheme())
connectToTcpServer();
else if (server.scheme() == Utils::urlSocketScheme())
startLocalServer();
else
QTC_ASSERT(false, emit connectionFailed());
}
void QmlDebugConnectionManager::disconnectFromServer()
{
m_server.clear();
destroyConnection();
stopConnectionTimer();
}
bool QmlDebugConnectionManager::isConnecting() const
{
return m_connectionTimer.isActive();
}
static quint16 port16(const QUrl &url)
{
const int port32 = url.port();
QTC_ASSERT(port32 > 0 && port32 <= std::numeric_limits<quint16>::max(), return 0);
return static_cast<quint16>(port32);
}
void QmlDebugConnectionManager::connectToTcpServer()
{
// Calling this again when we're already trying means "reset the retry timer". This is
// useful in cases where we have to parse the port from the output. We might waste retries
// on an initial guess for the port.
stopConnectionTimer();
connect(&m_connectionTimer, &QTimer::timeout, this, [this]{
QTC_ASSERT(!isConnected(), return);
if (++(m_numRetries) < m_maximumRetries) {
if (m_connection.isNull()) {
// If the previous connection failed, recreate it.
createConnection();
m_connection->connectToHost(m_server.host(), port16(m_server));
} else if (m_numRetries < 3
&& m_connection->socketState() != QAbstractSocket::ConnectedState) {
// If we don't get connected in the first retry interval, drop the socket and try
// with a new one. On some operating systems (maxOS) the very first connection to a
// TCP server takes a very long time to get established and this helps.
// On other operating systems (windows) every connection takes forever to get
// established. So, after tearing down and rebuilding the socket twice, just
// keep trying with the same one.
m_connection->connectToHost(m_server.host(), port16(m_server));
} // Else leave it alone and wait for hello.
} else {
// On final timeout, clear the connection.
stopConnectionTimer();
destroyConnection();
emit connectionFailed();
}
});
m_connectionTimer.start(m_retryInterval);
if (m_connection.isNull()) {
createConnection();
QTC_ASSERT(m_connection, emit connectionFailed(); return);
m_connection->connectToHost(m_server.host(), port16(m_server));
}
}
void QmlDebugConnectionManager::startLocalServer()
{
stopConnectionTimer();
connect(&m_connectionTimer, &QTimer::timeout, this, [this] {
QTC_ASSERT(!isConnected(), return);
// We leave the server running as some application might currently be trying to
// connect. Don't cut this off, or the application might hang on the hello mutex.
// qmlConnectionFailed() might drop the connection, which is fatal. We detect this
// here and signal it accordingly.
if (!m_connection || ++(m_numRetries) >= m_maximumRetries) {
stopConnectionTimer();
destroyConnection();
emit connectionFailed();
}
});
m_connectionTimer.start(m_retryInterval);
if (m_connection.isNull()) {
// Otherwise, reuse the same one
createConnection();
QTC_ASSERT(m_connection, emit connectionFailed(); return);
m_connection->startLocalServer(m_server.path());
}
}
void QmlDebugConnectionManager::retryConnect()
{
destroyConnection();
if (m_server.scheme() == Utils::urlSocketScheme()) {
startLocalServer();
} else if (m_server.scheme() == Utils::urlTcpScheme()) {
connectToTcpServer();
} else {
emit connectionFailed();
}
}
void QmlDebugConnectionManager::logState(const QString &message)
{
Q_UNUSED(message)
}
QmlDebugConnection *QmlDebugConnectionManager::connection() const
{
return m_connection.data();
}
void QmlDebugConnectionManager::createConnection()
{
QTC_ASSERT(m_connection.isNull(), destroyConnection());
m_connection.reset(new QmlDebug::QmlDebugConnection);
createClients();
connectConnectionSignals();
}
void QmlDebugConnectionManager::connectConnectionSignals()
{
QTC_ASSERT(m_connection, return);
QObject::connect(m_connection.data(), &QmlDebug::QmlDebugConnection::connected,
this, &QmlDebugConnectionManager::qmlDebugConnectionOpened);
QObject::connect(m_connection.data(), &QmlDebug::QmlDebugConnection::disconnected,
this, &QmlDebugConnectionManager::qmlDebugConnectionClosed);
QObject::connect(m_connection.data(), &QmlDebug::QmlDebugConnection::connectionFailed,
this, &QmlDebugConnectionManager::qmlDebugConnectionFailed);
QObject::connect(m_connection.data(), &QmlDebug::QmlDebugConnection::logStateChange,
this, &QmlDebugConnectionManager::logState);
QObject::connect(m_connection.data(), &QmlDebug::QmlDebugConnection::logError,
this, &QmlDebugConnectionManager::logState);
}
void QmlDebugConnectionManager::disconnectConnectionSignals()
{
QTC_ASSERT(m_connection, return);
m_connection->disconnect();
}
bool QmlDebugConnectionManager::isConnected() const
{
return m_connection && m_connection->isConnected();
}
void QmlDebugConnectionManager::destroyConnection()
{
// This might be called indirectly by QDebugConnectionPrivate::readyRead().
// Therefore, allow the function to complete before deleting the object.
if (m_connection) {
// Don't receive any more signals from the connection or the client
disconnectConnectionSignals();
destroyClients();
m_connection.take()->deleteLater();
}
}
void QmlDebugConnectionManager::qmlDebugConnectionOpened()
{
logState(tr("Debug connection opened."));
QTC_ASSERT(m_connection, return);
QTC_ASSERT(m_connection->isConnected(), return);
stopConnectionTimer();
emit connectionOpened();
}
void QmlDebugConnectionManager::qmlDebugConnectionClosed()
{
logState(tr("Debug connection closed."));
QTC_ASSERT(m_connection, return);
QTC_ASSERT(!m_connection->isConnected(), return);
destroyConnection();
emit connectionClosed();
}
void QmlDebugConnectionManager::qmlDebugConnectionFailed()
{
logState(tr("Debug connection failed."));
QTC_ASSERT(m_connection, return);
QTC_ASSERT(!m_connection->isConnected(), /**/);
destroyConnection();
// The retry handler, driven by m_connectionTimer should decide to retry or signal a failure.
QTC_ASSERT(m_connectionTimer.isActive(), emit connectionFailed());
}
void QmlDebugConnectionManager::stopConnectionTimer()
{
m_connectionTimer.stop();
m_connectionTimer.disconnect();
m_numRetries = 0;
}
} // namespace QmlDebug
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