cards-simulator/unity/Assets/Scripts/TcpConnection.cs

using System.IO;
using System.Net.Sockets;
using System.Collections.Concurrent;
using System.Threading;
using System;
using Google.Protobuf;
using UnityEngine;

public class TcpConnection {
	private TcpClient c;
	public ConcurrentQueue<Protocol.ServerClientPacket> q;
	private Thread receiverThread;

	private Protocol.ServerClientPacket Receive() {
		
		byte[] b = new byte[4];
		int receivedBytes = c.Client.Receive(b, 0, 4,
								   SocketFlags.None);
		if (receivedBytes != 4) {
			return null;
		}
		if (!BitConverter.IsLittleEndian) {
			// Invert byte order, in order to get little endian byte order
			byte a = b[0];
			b[0] = b[3];
			b[3] = a;
			a = b[1];
			b[1] = b[2];
			b[2] = a;
		}
		int size = BitConverter.ToInt32(b, 0);
		byte[] data = new byte[size];
		c.Client.Receive(data, 0, size, SocketFlags.None);
		Debug.Log("Recieved " + size + " bytes");
		return Protocol.ServerClientPacket.Parser.ParseFrom(data);
	}

	private void ReceiverThread() {
		Debug.Log("Started receiver thread");
		while(true) {
			Protocol.ServerClientPacket packet = Receive();
			if (packet == null) {
				break;
			}
			q.Enqueue(packet);
		}
		Debug.Log("Stopped receiver thread");
	}

	public void Close() {
		receiverThread.Join();
    }

	public TcpConnection(string address) {
		string[] ipAndPort = address.Split(':');
		c = new TcpClient(ipAndPort[0], int.Parse(ipAndPort[1]));
		q = new ConcurrentQueue<Protocol.ServerClientPacket>();
		receiverThread = new Thread(new ThreadStart(ReceiverThread));
		Debug.Log("Starting receiver thread");
		receiverThread.Start();
	}

	public void SendMessage(Protocol.ClientServerPacket packet) {
		int size = packet.CalculateSize();
		byte[] sizeBytes = BitConverter.GetBytes(size);
		if (!BitConverter.IsLittleEndian) {
			// Invert byte order, in order to get little endian byte order
			byte a = sizeBytes[0];
			sizeBytes[0] = sizeBytes[3];
			sizeBytes[3] = a;
			a = sizeBytes[1];
			sizeBytes[1] = sizeBytes[2];
			sizeBytes[2] = a;
		}
		c.Client.Send(sizeBytes);
		byte[] data = packet.ToByteArray();
		c.Client.Send(data);
	}

}