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// Copyright (C) 2019 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#include "qdbwatcher.h"
#include "hostmessages.h"
#include "../qdbtr.h"
#include "../qdbutils.h"
#include <utils/filepath.h>
#include <utils/qtcprocess.h>
#include <QFile>
#include <QTimer>
namespace Qdb::Internal {
const int startupDelay = 500; // time in ms to wait for host server startup before retrying
const QString qdbSocketName = "qdb.socket";
QMutex QdbWatcher::s_startMutex;
bool QdbWatcher::s_startedServer = false;
QdbWatcher::QdbWatcher(QObject *parent)
: QObject(parent)
, m_requestType(RequestType::Unknown)
{
}
QdbWatcher::~QdbWatcher()
{
stop();
}
void QdbWatcher::start(RequestType requestType)
{
m_requestType = requestType;
startPrivate();
}
void QdbWatcher::startPrivate()
{
m_socket = std::unique_ptr<QLocalSocket>(new QLocalSocket());
connect(m_socket.get(), &QLocalSocket::connected,
this, &QdbWatcher::handleWatchConnection);
connect(m_socket.get(), &QLocalSocket::errorOccurred,
this, &QdbWatcher::handleWatchError);
m_socket->connectToServer(qdbSocketName);
}
void QdbWatcher::stop()
{
m_shuttingDown = true;
if (m_socket)
m_socket->disconnectFromServer();
}
void QdbWatcher::handleWatchConnection()
{
m_retried = false;
{
QMutexLocker lock(&s_startMutex);
s_startedServer = false;
}
connect(m_socket.get(), &QIODevice::readyRead, this, &QdbWatcher::handleWatchMessage);
m_socket->write(createRequest(m_requestType));
}
void QdbWatcher::handleWatchError(QLocalSocket::LocalSocketError error)
{
if (m_shuttingDown)
return;
if (error == QLocalSocket::PeerClosedError) {
retry();
return;
}
if (error != QLocalSocket::ServerNotFoundError
&& error != QLocalSocket::ConnectionRefusedError) {
stop();
emit watcherError(Tr::tr("Unexpected QLocalSocket error: %1")
.arg(m_socket->errorString()));
return;
}
if (m_retried) {
stop();
emit watcherError(Tr::tr("Could not connect to QDB host server even after trying to start it."));
return;
}
retry();
}
void QdbWatcher::handleWatchMessage()
{
while (m_socket->bytesAvailable() > 0) {
const QByteArray responseBytes = m_socket->readLine();
const auto document = QJsonDocument::fromJson(responseBytes);
if (document.isNull()) {
const QString message =
Tr::tr("Invalid JSON response received from QDB server: %1");
emit watcherError(message.arg(QString::fromUtf8(responseBytes)));
return;
}
emit incomingMessage(document);
}
}
void QdbWatcher::forkHostServer()
{
Utils::FilePath qdbFilePath = findTool(QdbTool::Qdb);
QFile executable(qdbFilePath.toString());
if (!executable.exists()) {
const QString message = Tr::tr("Could not find QDB host server executable. "
"You can set the location with environment variable %1.")
.arg(overridingEnvironmentVariable(QdbTool::Qdb));
showMessage(message, true);
return;
}
if (Utils::Process::startDetached({qdbFilePath, {"server"}}))
showMessage(Tr::tr("QDB host server started."), false);
else
showMessage(Tr::tr("Could not start QDB host server in %1").arg(qdbFilePath.toString()), true);
}
void QdbWatcher::retry()
{
m_retried = true;
{
QMutexLocker lock(&s_startMutex);
if (!s_startedServer) {
showMessage(Tr::tr("Starting QDB host server."), false);
forkHostServer();
s_startedServer = true;
}
}
QTimer::singleShot(startupDelay, this, &QdbWatcher::startPrivate);
}
} // Qdb::Internal
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