NetHost.cpp

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/* Copyright (C) 2010 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/>.
 */

#include "precompiled.h"

#include "NetHost.h"

#include "lib/external_libraries/enet.h"
#include "network/NetMessage.h"
#include "ps/CLogger.h"

bool CNetHost::SendMessage(const CNetMessage* message, ENetPeer* peer, const char* peerName)
{
    ENetPacket* packet = CreatePacket(message);
    if (!packet)
        return false;

    LOGMESSAGE(L"Net: Sending message %hs of size %lu to %hs", message->ToString().c_str(), (unsigned long)packet->dataLength, peerName);

    // Let ENet send the message to peer
    if (enet_peer_send(peer, DEFAULT_CHANNEL, packet) < 0)
    {
        LOGERROR(L"Net: Failed to send packet to peer");
        return false;
    }

    // Don't call enet_host_flush now - let it queue up all the packets
    // and send them during the next frame
    //
    // TODO: we should flush explicitly at some appropriate point before the next frame

    return true;
}

ENetPacket* CNetHost::CreatePacket(const CNetMessage* message)
{
    size_t size = message->GetSerializedLength();

    ENSURE(size); // else we'll fail when accessing the 0th element

    // Adjust buffer for message
    std::vector<u8> buffer;
    buffer.resize(size);

    // Save message to internal buffer
    message->Serialize(&buffer[0]);

    // Create a reliable packet
    ENetPacket* packet = enet_packet_create(&buffer[0], size, ENET_PACKET_FLAG_RELIABLE);
    if (!packet)
        LOGERROR(L"Net: Failed to construct packet");

    return packet;
}

void CNetHost::Initialize()
{
    int ret = enet_initialize();
    ENSURE(ret == 0);
}

void CNetHost::Deinitialize()
{
    enet_deinitialize();
}