C++ CNetServerSession::SendMessage方法代码示例

bool CNetServerWorker::OnJoinSyncingLoadedGame(void* context, CFsmEvent* event)
{
	// A client rejoining an in-progress game has now finished loading the
	// map and deserialized the initial state.
	// The simulation may have progressed since then, so send any subsequent
	// commands to them and set them as an active player so they can participate
	// in all future turns.
	// 
	// (TODO: if it takes a long time for them to receive and execute all these
	// commands, the other players will get frozen for that time and may be unhappy;
	// we could try repeating this process a few times until the client converges
	// on the up-to-date state, before setting them as active.)

	ENSURE(event->GetType() == (uint)NMT_LOADED_GAME);

	CNetServerSession* session = (CNetServerSession*)context;
	CNetServerWorker& server = session->GetServer();

	CLoadedGameMessage* message = (CLoadedGameMessage*)event->GetParamRef();

	u32 turn = message->m_CurrentTurn;
	u32 readyTurn = server.m_ServerTurnManager->GetReadyTurn();

	// Send them all commands received since their saved state,
	// and turn-ended messages for any turns that have already been processed
	for (size_t i = turn + 1; i < std::max(readyTurn+1, (u32)server.m_SavedCommands.size()); ++i)
	{
		if (i < server.m_SavedCommands.size())
			for (size_t j = 0; j < server.m_SavedCommands[i].size(); ++j)
				session->SendMessage(&server.m_SavedCommands[i][j]);

		if (i <= readyTurn)
		{
			CEndCommandBatchMessage endMessage;
			endMessage.m_Turn = i;
			endMessage.m_TurnLength = server.m_ServerTurnManager->GetSavedTurnLength(i);
			session->SendMessage(&endMessage);
		}
	}

	// Tell the turn manager to expect commands from this new client
	server.m_ServerTurnManager->InitialiseClient(session->GetHostID(), readyTurn);

	// Tell the client that everything has finished loading and it should start now
	CLoadedGameMessage loaded;
	loaded.m_CurrentTurn = readyTurn;
	session->SendMessage(&loaded);

	return true;
}

	virtual void OnComplete()
	{
		// We've received the game state from an existing player - now
		// we need to send it onwards to the newly rejoining player

		// Find the session corresponding to the rejoining host (if any)
		CNetServerSession* session = NULL;
		for (size_t i = 0; i < m_Server.m_Sessions.size(); ++i)
		{
			if (m_Server.m_Sessions[i]->GetHostID() == m_RejoinerHostID)
			{
				session = m_Server.m_Sessions[i];
				break;
			}
		}

		if (!session)
		{
			LOGMESSAGE("Net server: rejoining client disconnected before we sent to it");
			return;
		}

		// Store the received state file, and tell the client to start downloading it from us
		// TODO: this will get kind of confused if there's multiple clients downloading in parallel;
		// they'll race and get whichever happens to be the latest received by the server,
		// which should still work but isn't great
		m_Server.m_JoinSyncFile = m_Buffer;
		CJoinSyncStartMessage message;
		session->SendMessage(&message);
	}

bool CNetServerWorker::OnClientHandshake(void* context, CFsmEvent* event)
{
	ENSURE(event->GetType() == (uint)NMT_CLIENT_HANDSHAKE);

	CNetServerSession* session = (CNetServerSession*)context;
	CNetServerWorker& server = session->GetServer();

	CCliHandshakeMessage* message = (CCliHandshakeMessage*)event->GetParamRef();
	if (message->m_ProtocolVersion != PS_PROTOCOL_VERSION)
	{
		session->Disconnect(NDR_INCORRECT_PROTOCOL_VERSION);
		return false;
	}

	CSrvHandshakeResponseMessage handshakeResponse;
	handshakeResponse.m_UseProtocolVersion = PS_PROTOCOL_VERSION;
	handshakeResponse.m_Message = server.m_WelcomeMessage;
	handshakeResponse.m_Flags = 0;
	session->SendMessage(&handshakeResponse);

	return true;
}

bool CNetServerWorker::OnAuthenticate(void* context, CFsmEvent* event)
{
	ENSURE(event->GetType() == (uint)NMT_AUTHENTICATE);

	CNetServerSession* session = (CNetServerSession*)context;
	CNetServerWorker& server = session->GetServer();

	// Prohibit joins while the game is loading
	if (server.m_State == SERVER_STATE_LOADING)
	{
		LOGMESSAGE("Refused connection while the game is loading");
		session->Disconnect(NDR_SERVER_LOADING);
		return true;
	}

	CAuthenticateMessage* message = (CAuthenticateMessage*)event->GetParamRef();
	CStrW username = server.DeduplicatePlayerName(SanitisePlayerName(message->m_Name));

	// Optionally allow observers to join after the game has started
	bool observerLateJoin = false;
	ScriptInterface& scriptInterface = server.GetScriptInterface();
	JSContext* cx = scriptInterface.GetContext();
	JSAutoRequest rq(cx);
	JS::RootedValue settings(cx);
	scriptInterface.GetProperty(server.m_GameAttributes.get(), "settings", &settings);
	if (scriptInterface.HasProperty(settings, "ObserverLateJoin"))
		scriptInterface.GetProperty(settings, "ObserverLateJoin", observerLateJoin);

	// If the game has already started, only allow rejoins
	bool isRejoining = false;
	if (server.m_State != SERVER_STATE_PREGAME)
	{
		// Search for an old disconnected player of the same name
		// (TODO: if GUIDs were stable, we should use them instead)
		isRejoining =
			observerLateJoin ||
			std::find_if(
				server.m_PlayerAssignments.begin(), server.m_PlayerAssignments.end(),
				[&username] (const std::pair<CStr, PlayerAssignment>& pair)
				{ return !pair.second.m_Enabled && pair.second.m_Name == username; })
			!= server.m_PlayerAssignments.end();

		// Players who weren't already in the game are not allowed to join now that it's started
		if (!isRejoining)
		{
			LOGMESSAGE("Refused connection after game start from not-previously-known user \"%s\"", utf8_from_wstring(username));
			session->Disconnect(NDR_SERVER_ALREADY_IN_GAME);
			return true;
		}
	}

	// TODO: check server password etc?

	u32 newHostID = server.m_NextHostID++;

	session->SetUserName(username);
	session->SetGUID(message->m_GUID);
	session->SetHostID(newHostID);

	CAuthenticateResultMessage authenticateResult;
	authenticateResult.m_Code = isRejoining ? ARC_OK_REJOINING : ARC_OK;
	authenticateResult.m_HostID = newHostID;
	authenticateResult.m_Message = L"Logged in";
	session->SendMessage(&authenticateResult);

	server.OnUserJoin(session);

	if (isRejoining)
	{
		// Request a copy of the current game state from an existing player,
		// so we can send it on to the new player

		// Assume session 0 is most likely the local player, so they're
		// the most efficient client to request a copy from
		CNetServerSession* sourceSession = server.m_Sessions.at(0);
		sourceSession->GetFileTransferer().StartTask(
			shared_ptr<CNetFileReceiveTask>(new CNetFileReceiveTask_ServerRejoin(server, newHostID))
		);

		session->SetNextState(NSS_JOIN_SYNCING);
	}

	return true;
}