sodoff-mmo/src/Core/Client.cs

using sodoffmmo.Data;
using System;
using System.Net.Sockets;
using System.Runtime.CompilerServices;

namespace sodoffmmo.Core;
public class Client {
    static int id;
    static object lck = new();

    public int ClientID { get; private set; }
    public PlayerData PlayerData { get; set; } = new();
    public Room? Room { get; private set; }

    private readonly Socket socket;
    SocketBuffer socketBuffer = new();
    private volatile bool scheduledDisconnect = false;
    private readonly object clientLock = new();

    public Client(Socket clientSocket) {
        socket = clientSocket;
        lock (lck) {
            ClientID = ++id;
        }
    }

    public async Task Receive() {
        byte[] buffer = new byte[2048];
        int len = await socket.ReceiveAsync(buffer, SocketFlags.None);
        if (len == 0)
            throw new SocketException();
        socketBuffer.Write(buffer, len);
    }

    public bool TryGetNextPacket(out NetworkPacket packet) {
        return socketBuffer.ReadPacket(out packet);
    }

    public void Send(NetworkPacket packet) {
        try {
            socket.Send(packet.SendData);
        } catch (SocketException) {
            SheduleDisconnect();
        }
    }

    public void SetRoom(Room? room) {
        lock(clientLock) {
            // set variable player data as not valid, but do not reset all player data
            PlayerData.IsValid = false;

            if (Room != null) {
                Console.WriteLine($"Leave room: {Room.Name} (id={Room.Id}, size={Room.ClientsCount}) IID: {ClientID}");
                Room.RemoveClient(this);

                NetworkObject data = new();
                data.Add("r", Room.Id);
                data.Add("u", ClientID);
                Room.Send(NetworkObject.WrapObject(0, 1004, data).Serialize());
            }

            // set new room (null when SetRoom is used as LeaveRoom)
            Room = room;

            if (Room != null) {
                Console.WriteLine($"Join room: {Room.Name} RoomID (id={Room.Id}, size={Room.ClientsCount}) IID: {ClientID}");
                Room.AddClient(this);

                Send(Room.SubscribeRoom());
                UpdatePlayerUserVariables();
            }
        }
    }

    private void UpdatePlayerUserVariables() {
        foreach (Client c in Room.Clients) {
            NetworkObject cmd = new();
            NetworkObject obj = new();
            cmd.Add("c", "SUV");
            obj.Add("MID", c.ClientID);
            cmd.Add("p", obj);
            Send(NetworkObject.WrapObject(1, 13, cmd).Serialize());
        }
    }

    public void Disconnect() {
        try {
            socket.Shutdown(SocketShutdown.Both);
        } finally {
            socket.Close();
        }
    }

    public void SheduleDisconnect() {
        if (Room != null) {
            // quiet remove from room (to avoid issues in Room.Send)
            //  - do not change Room value here
            //  - full remove will be will take place Server.HandleClient (before real disconnected)
            Room.RemoveClient(this);
        }
        scheduledDisconnect = true;
    }

    public bool Connected {
        get {
            return socket.Connected && !scheduledDisconnect;
        }
    }
}