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/******************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the Qt Debug Bridge.
**
** $QT_BEGIN_LICENSE:COMM$
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** $QT_END_LICENSE$
**
******************************************************************************/
#include "server.h"
#include "createexecutor.h"
#include "echoexecutor.h"
#include "libqdb/make_unique.h"
#include "libqdb/protocol/protocol.h"
#include "libqdb/protocol/qdbmessage.h"
#include "libqdb/protocol/qdbtransport.h"
#include "libqdb/stream.h"
#include <QtCore/qdebug.h>
#include <QtCore/qloggingcategory.h>
#include <algorithm>
Q_LOGGING_CATEGORY(connectionC, "qdb.connection");
Server::Server(QdbTransport *transport, QObject *parent)
: AbstractConnection{transport, parent},
m_state{ServerState::Disconnected},
m_executors{}
{
}
Server::~Server() = default;
void Server::handleMessage()
{
QdbMessage message = m_transport->receive();
Q_ASSERT_X(message.command() != QdbMessage::Invalid, "Server::handleMessage()", "Received invalid message");
switch (m_state) {
case ServerState::Disconnected:
if (message.command() != QdbMessage::Connect) {
qCWarning(connectionC) << "Server got non-Connect message in Disconnected state. Resetting.";
resetServer(false);
break;
}
checkVersion(message);
resetServer(true);
break;
case ServerState::Connected:
switch (message.command()) {
case QdbMessage::Connect:
qCWarning(connectionC()) << "Server received QdbMessage::Connect while already connected. Resetting.";
checkVersion(message);
resetServer(true);
break;
case QdbMessage::Open:
handleOpen(message.hostStream(), message.data());
break;
case QdbMessage::Write:
handleWrite(message);
break;
case QdbMessage::Close:
closeStream(message.deviceStream());
break;
case QdbMessage::Ok:
qCWarning(connectionC) << "Server received QdbMessage::Ok in connected state";
break;
case QdbMessage::Invalid:
Q_UNREACHABLE();
break;
}
break;
case ServerState::Waiting:
switch (message.command()) {
case QdbMessage::Connect:
qCWarning(connectionC()) << "Server received QdbMessage::Connect while already connected and waiting. Resetting.";
resetServer(true);
break;
case QdbMessage::Open:
handleOpen(message.hostStream(), message.data());
break;
case QdbMessage::Write:
handleWrite(message);
break;
case QdbMessage::Close:
m_state = ServerState::Connected;
closeStream(message.deviceStream());
break;
case QdbMessage::Ok:
m_state = ServerState::Connected;
break;
case QdbMessage::Invalid:
Q_UNREACHABLE();
break;
}
break;
}
processQueue();
}
void Server::enqueueMessage(const QdbMessage &message)
{
Q_ASSERT(message.command() != QdbMessage::Invalid);
qCDebug(connectionC) << "Server enqueue: " << message;
m_outgoingMessages.enqueue(message);
processQueue();
}
void Server::processQueue()
{
if (m_outgoingMessages.isEmpty()) {
return;
}
if (m_state == ServerState::Waiting) {
qCDebug(connectionC) << "Server::processQueue() skipping to wait for QdbMessage::Ok";
return;
}
auto message = m_outgoingMessages.dequeue();
Q_ASSERT_X(message.command() != QdbMessage::Invalid, "Server::processQueue()",
"Tried to send invalid message");
if (!m_transport->send(message)) {
qCCritical(connectionC) << "Server could not send" << message;
m_state = ServerState::Disconnected;
return;
}
switch (message.command()) {
case QdbMessage::Open:
qFatal("Server sending QdbMessage::Open is not supported");
break;
case QdbMessage::Write:
Q_ASSERT(m_state == ServerState::Connected);
m_state = ServerState::Waiting;
break;
// Connect, Close and Ok are not acknowledged when sent by server,
// so no need to transition to ServerState::Waiting.
// Since there is no acknowledgment incoming, we also need to move
// onto the next message in the queue, otherwise it would only be sent
// after host sends us something.
case QdbMessage::Connect:
//[[fallthrough]]
case QdbMessage::Close:
//[[fallthrough]]
case QdbMessage::Ok:
if (!m_outgoingMessages.isEmpty()) {
processQueue();
}
break;
case QdbMessage::Invalid:
Q_UNREACHABLE();
break;
}
}
void Server::handleOpen(StreamId hostId, const QByteArray &tag)
{
StreamId deviceId = m_nextStreamId++;
enqueueMessage(QdbMessage{QdbMessage::Ok, hostId, deviceId});
m_streams[deviceId] = make_unique<Stream>(this, hostId, deviceId);
m_executors[deviceId] = createExecutor(m_streams[deviceId].get(), tag);
}
void Server::resetServer(bool hostConnected)
{
m_outgoingMessages.clear();
m_executors.clear();
m_streams.clear();
m_state = hostConnected ? ServerState::Connected : ServerState::Disconnected;
QByteArray buffer{};
QDataStream dataStream{&buffer, QIODevice::WriteOnly};
dataStream << qdbProtocolVersion;
enqueueMessage(QdbMessage{QdbMessage::Connect, 0, 0, buffer});
}
void Server::handleWrite(const QdbMessage &message)
{
if (m_streams.find(message.deviceStream()) == m_streams.end()) {
qCWarning(connectionC) << "Server received message to non-existing stream" << message.deviceStream();
enqueueMessage(QdbMessage{QdbMessage::Close, message.hostStream(), message.deviceStream()});
return;
}
enqueueMessage(QdbMessage{QdbMessage::Ok, message.hostStream(), message.deviceStream()});
m_streams[message.deviceStream()]->receiveMessage(message);
}
void Server::closeStream(StreamId id)
{
if (m_streams.find(id) == m_streams.end()) {
qCWarning(connectionC) << "Server received Close to a non-existing stream" << id;
return;
}
m_streams[id]->close();
m_executors.erase(id);
m_streams.erase(id);
auto messageInStream = [&id](const QdbMessage &message) {
return message.deviceStream() == id;
};
m_outgoingMessages.erase(
std::remove_if(m_outgoingMessages.begin(), m_outgoingMessages.end(), messageInStream),
m_outgoingMessages.end());
// Closes are not acknowledged
}
void Server::checkVersion(const QdbMessage &message)
{
Q_ASSERT(message.command() == QdbMessage::Connect);
Q_ASSERT(message.data().size() == sizeof(qdbProtocolVersion));
QDataStream dataStream{message.data()};
uint32_t protocolVersion;
dataStream >> protocolVersion;
if (protocolVersion != qdbProtocolVersion) {
qCCritical(connectionC()) << "Protocol version" << protocolVersion << "requested, but only version"
<< qdbProtocolVersion << "is known";
}
}
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