removed recursive lock in server; moved object serialisation to worker thread

common/server.cpp

@@ -36,7 +36,7 @@
 #include <QDebug>
 
 Server::Server(bool _threaded, QObject *parent)
-	: QObject(parent), threaded(_threaded), clientsLock(QReadWriteLock::Recursive), nextLocalGameId(0)
+	: QObject(parent), threaded(_threaded), nextLocalGameId(0)
 {
 	qRegisterMetaType<ServerInfo_Game>("ServerInfo_Game");
 	qRegisterMetaType<ServerInfo_Room>("ServerInfo_Room");
@@ -79,10 +79,9 @@ void Server::prepareDestroy()
 			clientsLock.unlock();
 		} while (!done);
 	} else {
-		clientsLock.lockForWrite();
+		// no locking is needed in unthreaded mode
 		while (!clients.isEmpty())
 			clients.first()->prepareDestroy();
-		clientsLock.unlock();
 	}
 	
 	roomsLock.lockForWrite();
@@ -224,7 +223,7 @@ void Server::removeClient(Server_ProtocolHandler *client)
 void Server::externalUserJoined(const ServerInfo_User &userInfo)
 {
 	// This function is always called from the main thread via signal/slot.
-	QWriteLocker locker(&clientsLock);
+	clientsLock.lockForWrite();
 	
 	Server_RemoteUserInterface *newUser = new Server_RemoteUserInterface(this, ServerInfo_User_Container(userInfo));
 	externalUsers.insert(QString::fromStdString(userInfo.name()), newUser);

common/server.h

@@ -42,6 +42,7 @@ public:
 	mutable QReadWriteLock clientsLock, roomsLock; // locking order: roomsLock before clientsLock
 	Server(bool _threaded, QObject *parent = 0);
 	~Server();
+	void setThreaded(bool _threaded) { threaded = _threaded; }
 	AuthenticationResult loginUser(Server_ProtocolHandler *session, QString &name, const QString &password, QString &reason, int &secondsLeft);
 	const QMap<int, Server_Room *> &getRooms() { return rooms; }
 	

common/server_protocolhandler.cpp

@@ -38,6 +38,8 @@ Server_ProtocolHandler::~Server_ProtocolHandler()
 {
 }
 
+// This function must only be called from the thread this object lives in.
+// The thread must not hold any server locks when calling this (e.g. clientsLock, roomsLock).
 void Server_ProtocolHandler::prepareDestroy()
 {
 	if (deleted)
@@ -399,6 +401,8 @@ Response::ResponseCode Server_ProtocolHandler::cmdGetGamesOfUser(const Command_G
 	if (authState == NotLoggedIn)
 		return Response::RespLoginNeeded;
 	
+	// XXX This does not take external users into account.
+	// XXX Maybe remove this check and test if the result list is empty at the end.
 	server->clientsLock.lockForRead();
 	if (!server->getUsers().contains(QString::fromStdString(cmd.user_name())))
 		return Response::RespNameNotFound;

servatrice/src/servatrice.cpp

@@ -44,6 +44,7 @@ Servatrice_GameServer::Servatrice_GameServer(Servatrice *_server, int _numberPoo
 	  server(_server)
 {
 	if (_numberPools == 0) {
+		server->setThreaded(false);
 		Servatrice_DatabaseInterface *newDatabaseInterface = new Servatrice_DatabaseInterface(0, server);
 		Servatrice_ConnectionPool *newPool = new Servatrice_ConnectionPool(newDatabaseInterface);
 		

servatrice/src/serversocketinterface.cpp

@@ -72,14 +72,14 @@ ServerSocketInterface::ServerSocketInterface(Servatrice *_server, Servatrice_Dat
 	socket->setSocketOption(QAbstractSocket::LowDelayOption, 1);
 	connect(socket, SIGNAL(readyRead()), this, SLOT(readClient()));
 	connect(socket, SIGNAL(error(QAbstractSocket::SocketError)), this, SLOT(catchSocketError(QAbstractSocket::SocketError)));
-	connect(this, SIGNAL(outputBufferChanged()), this, SLOT(flushOutputBuffer()), Qt::QueuedConnection);
+	connect(this, SIGNAL(outputQueueChanged()), this, SLOT(flushOutputQueue()));
 }
 
 ServerSocketInterface::~ServerSocketInterface()
 {
 	logger->logMessage("ServerSocketInterface destructor", this);
 	
-	flushOutputBuffer();
+	flushOutputQueue();
 }
 
 void ServerSocketInterface::initConnection(int socketDescriptor)
@@ -93,11 +93,10 @@ void ServerSocketInterface::initSessionDeprecated()
 {
 	// dirty hack to make v13 client display the correct error message
 	
-	outputBufferMutex.lock();
-	outputBuffer = "<?xml version=\"1.0\"?><cockatrice_server_stream version=\"14\">";
-	outputBufferMutex.unlock();
-	
-	emit outputBufferChanged();
+	QByteArray buf;
+	buf.append("<?xml version=\"1.0\"?><cockatrice_server_stream version=\"14\">");
+	socket->write(buf);
+	socket->flush();
 }
 
 bool ServerSocketInterface::initSession()
@@ -125,17 +124,6 @@ bool ServerSocketInterface::initSession()
 	return true;
 }
 
-void ServerSocketInterface::flushOutputBuffer()
-{
-	QMutexLocker locker(&outputBufferMutex);
-	if (outputBuffer.isEmpty())
-		return;
-	servatrice->incTxBytes(outputBuffer.size());
-	socket->write(outputBuffer);
-	socket->flush();
-	outputBuffer.clear();
-}
-
 void ServerSocketInterface::readClient()
 {
 	QByteArray data = socket->readAll();
@@ -183,18 +171,38 @@ void ServerSocketInterface::catchSocketError(QAbstractSocket::SocketError socket
 
 void ServerSocketInterface::transmitProtocolItem(const ServerMessage &item)
 {
-	QByteArray buf;
-	unsigned int size = item.ByteSize();
-	buf.resize(size + 4);
-	item.SerializeToArray(buf.data() + 4, size);
-	buf.data()[3] = (unsigned char) size;
-	buf.data()[2] = (unsigned char) (size >> 8);
-	buf.data()[1] = (unsigned char) (size >> 16);
-	buf.data()[0] = (unsigned char) (size >> 24);
+	outputQueueMutex.lock();
+	outputQueue.append(item);
+	outputQueueMutex.unlock();
 	
-	QMutexLocker locker(&outputBufferMutex);
-	outputBuffer.append(buf);
-	emit outputBufferChanged();
+	emit outputQueueChanged();
+}
+
+void ServerSocketInterface::flushOutputQueue()
+{
+	QMutexLocker locker(&outputQueueMutex);
+	if (outputQueue.isEmpty())
+		return;
+	
+	int totalBytes = 0;
+	while (!outputQueue.isEmpty()) {
+		const ServerMessage &item = outputQueue.first();
+		
+		QByteArray buf;
+		unsigned int size = item.ByteSize();
+		buf.resize(size + 4);
+		item.SerializeToArray(buf.data() + 4, size);
+		buf.data()[3] = (unsigned char) size;
+		buf.data()[2] = (unsigned char) (size >> 8);
+		buf.data()[1] = (unsigned char) (size >> 16);
+		buf.data()[0] = (unsigned char) (size >> 24);
+		socket->write(buf);
+		
+		totalBytes += size + 4;
+		outputQueue.removeFirst();
+	}
+	servatrice->incTxBytes(totalBytes);
+	socket->flush();
 }
 
 void ServerSocketInterface::logDebugMessage(const QString &message)
@@ -715,8 +723,8 @@ Response::ResponseCode ServerSocketInterface::cmdBanFromServer(const Command_Ban
 		for (int i = 0; i < userList.size(); ++i) {
 			SessionEvent *se = userList[i]->prepareSessionEvent(event);
 			userList[i]->sendProtocolItem(*se);
-			userList[i]->prepareDestroy();
 			delete se;
+			QMetaObject::invokeMethod(userList[i], "prepareDestroy", Qt::QueuedConnection);
 		}
 	}
 	

servatrice/src/serversocketinterface.h

@@ -54,18 +54,19 @@ class ServerSocketInterface : public Server_ProtocolHandler
 private slots:
 	void readClient();
 	void catchSocketError(QAbstractSocket::SocketError socketError);
-	void flushOutputBuffer();
+	void flushOutputQueue();
 signals:
-	void outputBufferChanged();
+	void outputQueueChanged();
 protected:
 	void logDebugMessage(const QString &message);
 private:
-	QMutex outputBufferMutex;
+	QMutex outputQueueMutex;
 	Servatrice *servatrice;
 	Servatrice_DatabaseInterface *sqlInterface;
 	QTcpSocket *socket;
 	
-	QByteArray inputBuffer, outputBuffer;
+	QByteArray inputBuffer;
+	QList<ServerMessage> outputQueue;
 	bool messageInProgress;
 	bool handshakeStarted;
 	int messageLength;