FeatherMC/src/DedicatedServer.cpp

#include "DedicatedServer.h"
#include "config/ServerProperties.h"

#include "PacketReader.h"

#include <chrono>
#include <string>

namespace Feather
{
    DedicatedServer::DedicatedServer(ServerProperties* properties) :
        m_properties(properties),
        m_listener(properties->serverPort.GetValue(), this),
        m_status()
    {
        m_status.descriptionText = properties->motd.GetValue();
        m_status.maxPlayers = properties->maxPlayers;
        
        m_worldManager.LoadWorld(m_properties->levelName);

        while (1)
        {
            auto [clients, clientsLock] = m_clients.borrow();
            for (auto& client : clients)
            {
                auto [data, clientLock] = client.GetTCPClient()->GetData().borrow();
                if (data.empty())
                    continue;
                uint32_t offset = 0;
                while (offset != data.size())
                {
                    auto reader = PacketReader(&data[offset]);
                    Protocol::ProcessPacket(*this, client, reader, client.GetContext().GetState());
                    offset += reader.Size();
                }
                data.clear();
            }

            // TODO: Move to tick thread !!
            {
                using namespace Protocol;
                using namespace std::chrono;

                // TODO: high_resolution_clock on mingw is innacurate and slow
                static auto lastKeepAlive = high_resolution_clock::now();
                auto now = high_resolution_clock::now();
                milliseconds td = duration_cast<milliseconds>(now - lastKeepAlive);

                if (td >= 1000ms) {
                    lastKeepAlive = now;

                    Play::ClientboundKeepAlive keepAlive =
                    {
                        // MC probably sends time since epoch
                        .id = duration_cast<milliseconds>(now.time_since_epoch()).count(),
                    };

                    for (auto &client : clients)
                    {
                        client.SendMessage(keepAlive);
                    }
                }
            }
        }
    }

    DedicatedServer::~DedicatedServer()
    {
    }

    void DedicatedServer::OnClientConnect(Network::TCPClientHandle&& client)
    {
        const auto& address = client->GetAddress();
        Log::Info("New connection from {}:{}", address.ip, address.port);

        auto [clients, lock] = m_clients.borrow();
        clients.emplace_back(std::move(client));
    }

    void DedicatedServer::OnClientDisconnect(const Network::TCPClient* client)
    {
        const auto& address = client->GetAddress();
        Log::Info("Disconnected from {}:{}", address.ip, address.port);

        auto [clients, lock] = m_clients.borrow();
        clients.remove_if([&](MinecraftClient& other) { return other.GetTCPClient().get() == client; });
    }

    using namespace Protocol;

    void DedicatedServer::HandleUnknownPacket(MinecraftClient &client, int32_t id, const PacketReader &packet)
    {
        Log::Trace("Got unknown packet with ID {} from client.", id);
    }

    void DedicatedServer::HandleLegacyPing(MinecraftClient& client)
    {
        Log::Info("Got legacy server list ping.");
    }

#pragma region Handshake & Status

    template <>
    void DedicatedServer::HandlePacket(MinecraftClient& client, const Handholding::ServerboundHandshake& handshake)
    {
        Log::Info("Client Intention Packet: version={}, serverIp={}, port={}, intention={}\n",
            handshake.protocolVersion,
            handshake.serverIP.c_str(),
            handshake.port,
            handshake.intention
        );

        client.GetContext().SetState(handshake.intention);
    }

    template <>
    void DedicatedServer::HandlePacket(MinecraftClient& client, const Status::ServerboundRequest& request)
    {
        Log::Info("Client sent STATUS_PING_REQUEST");

        Status::ClientboundResponse message =
        {
            .jsonResponse = m_status.GetServerStatusJSON()
        };

        client.SendMessage(message);
    }

    template <>
    void DedicatedServer::HandlePacket(MinecraftClient& client, const Status::ServerboundPing& ping)
    {
        Log::Info("Client sent STATUS_PING: {}", ping.timestamp);

        Status::ClientboundPong message =
        {
            .timestamp = ping.timestamp
        };

        client.SendMessage(message);
    }

#pragma endregion

    template <>
    void DedicatedServer::HandlePacket(MinecraftClient& client,const Login::ServerboundStart& start)
    {
        //Login::ClientboundSuccess success =
        //{
        //    .uuid = { 4658857991808325907ull, 7518717155607718277ull },
        //    .username = start.username
        //};
        std::string uuid = "ecb99913-96a8-40a7-8529-a2ca6ad95768";
        Login::ClientboundSuccess success =
        {
            .uuid = uuid,
            .username = start.username
        };

        client.SendMessage(success);
        client.GetContext().SetState(ProtocolState::Play);

        std::string type = "default";
        Play::ClientboundJoinGame join =
        {
            .entityId  = 0,
            .gamemode  = 0,
            .dimension = 0,
            .seedHash  = 0,
            .maxPlayers = uint8_t(m_properties->maxPlayers.GetValue()),
            .levelType  = type,
            .viewDistance = m_properties->viewDistance,
            .reducedDebugInfo = false,
            .enableRespawnScreen = true
        };

        client.SendMessage(join);

        Play::ClientboundSpawnPosition spawnPos =
        {
            .location = BlockPos(0, 64, 0),
        };

        client.SendMessage(spawnPos);

        using RelativeFlags = Play::ClientboundPlayerPositionAndLook::RelativeFlags;

        Play::ClientboundPlayerPositionAndLook playerPos = 
        {
            .x = 0,
            .y = 64,
            .z = 0,
            .xRot = 0,
            .yRot = 0,
            .flags = (RelativeFlags)0,
            .id = 0,
        };

        client.SendMessage(playerPos);
    }

    template <>
    void DedicatedServer::HandlePacket(MinecraftClient& client, const Play::ServerboundKeepAlive& keepAlive)
    {
        // TODO: check these and kick clients that don't send em right or at all
    }
}