NetServerTurnManager.h

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/* Copyright (C) 2021 Wildfire Games.
 * This file is part of 0 A.D.
 *
 * 0 A.D. 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, either version 2 of the License, or
 * (at your option) any later version.
 *
 * 0 A.D. 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 0 A.D.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef INCLUDED_NETSERVERTURNMANAGER
#define INCLUDED_NETSERVERTURNMANAGER
 
#include "ps/CStr.h"
 
#include <map>
#include <unordered_map>
 
class CNetServerWorker;
class CNetServerSession;
 
/**
 * The server-side counterpart to CNetClientTurnManager.
 * Records the turn state of each client, and sends turn advancement messages
 * when clients are ready.
 *
 * Thread-safety:
 * - This is constructed and used by CNetServerWorker in the network server thread.
 */
class CNetServerTurnManager
{
    NONCOPYABLE(CNetServerTurnManager);
public:
    CNetServerTurnManager(CNetServerWorker& server);
 
    void NotifyFinishedClientCommands(CNetServerSession& session, u32 turn);
 
    void NotifyFinishedClientUpdate(CNetServerSession& session, u32 turn, const CStr& hash);
 
    /**
     * Inform the turn manager of a new client
     * @param observer - whether this client is an observer.
     */
    void InitialiseClient(int client, u32 turn, bool observer);
 
    /**
     * Inform the turn manager that a previously-initialised client has left the game.
     */
    void UninitialiseClient(int client);
 
    void SetTurnLength(u32 msecs);
 
    /**
     * Returns the latest turn for which all clients are ready;
     * they will have already been told to execute this turn.
     */
    u32 GetReadyTurn() { return m_ReadyTurn; }
 
    /**
     * Returns the turn length that was used for the given turn.
     * Requires turn <= GetReadyTurn().
     */
    u32 GetSavedTurnLength(u32 turn);
 
private:
    void CheckClientsReady();
 
    struct Client
    {
        CStrW playerName;
        // Latest turn for which all commands have been received.
        u32 readyTurn;
        // Last known simulated turn.
        u32 simulatedTurn;
        bool isObserver;
        bool isOOS = false;
    };
 
    std::unordered_map<int, Client> m_ClientsData;
 
    // Cached value - is any client OOS? This is reset when the OOS client leaves.
    bool m_HasSyncError = false;
 
    // Map of turn -> {Client ID -> state hash}; old indexes <= min(m_ClientsSimulated) are deleted
    std::map<u32, std::map<int, std::string>> m_ClientStateHashes;
 
    /// The latest turn for which we have received all commands from all clients
    u32 m_ReadyTurn;
 
    // Current turn length
    u32 m_TurnLength;
 
    // Turn lengths for all previously executed turns
    std::vector<u32> m_SavedTurnLengths;
 
    CNetServerWorker& m_NetServer;
};
 
#endif // INCLUDED_NETSERVERTURNMANAGER