cpp/openttd-patchpack/source Files · src/network/network_coordinator.h

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Patric Stout

Change: groundwork to allow ServerAddress to use invite codes

Normally TCPConnecter will do a DNS resolving of the connection_string
and connect to it. But for SERVER_ADDRESS_INVITE_CODE this is different:
the Game Coordinator does the "resolving".

This means we need to allow TCPConnecter to not setup a connection
and allow it to be told when a connection has been setup by an external
(to TCPConnecter) part of the code. We do this by telling the (active)
socket for the connection.

This means the rest of the code doesn't need to know the TCPConnecter
is not doing a simple resolve+connect. The rest of the code only
cares the connection is established; not how it was established.


/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */

/** @file network_coordinator.h Part of the network protocol handling Game Coordinator requests. */

#ifndef NETWORK_COORDINATOR_H
#define NETWORK_COORDINATOR_H

#include "core/tcp_coordinator.h"

/**
 * Game Coordinator communication.
 *
 * For servers:
 *  - Server sends SERVER_REGISTER.
 *  - Game Coordinator probes server to check if it can directly connect.
 *  - Game Coordinator sends GC_REGISTER_ACK with type of connection.
 *  - Server sends every 30 seconds SERVER_UPDATE.
 *
 * For clients (listing):
 *  - Client sends CLIENT_LISTING.
 *  - Game Coordinator returns the full list of public servers via GC_LISTING (multiple packets).
 */

/** Class for handling the client side of the Game Coordinator connection. */
class ClientNetworkCoordinatorSocketHandler : public NetworkCoordinatorSocketHandler {
private:
	std::chrono::steady_clock::time_point next_update; ///< When to send the next update (if server and public).

protected:
	bool Receive_GC_ERROR(Packet *p) override;
	bool Receive_GC_REGISTER_ACK(Packet *p) override;
	bool Receive_GC_LISTING(Packet *p) override;

public:
	/** The idle timeout; when to close the connection because it's idle. */
	static constexpr std::chrono::seconds IDLE_TIMEOUT = std::chrono::seconds(60);

	std::chrono::steady_clock::time_point last_activity;  ///< The last time there was network activity.
	bool connecting; ///< Are we connecting to the Game Coordinator?

	ClientNetworkCoordinatorSocketHandler() : connecting(false) {}

	NetworkRecvStatus CloseConnection(bool error = true) override;
	void SendReceive();

	void Connect();

	void Register();
	void SendServerUpdate();
	void GetListing();
};

extern ClientNetworkCoordinatorSocketHandler _network_coordinator_client;

#endif /* NETWORK_COORDINATOR_H */