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Copy pathSocketContext.cs
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293 lines (239 loc) · 6.18 KB
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.Threading;
namespace NetcodeIO.NET.Utils.IO
{
internal interface ISocketContext : IDisposable
{
int BoundPort { get; }
void Close();
void Bind(EndPoint endpoint);
void SendTo(byte[] data, EndPoint remoteEP);
void SendTo(byte[] data, int length, EndPoint remoteEP);
bool Read(out Datagram packet);
void Pump();
}
internal class UDPSocketContext : ISocketContext
{
public int BoundPort
{
get
{
return ((IPEndPoint)internalSocket.LocalEndPoint).Port;
}
}
private Socket internalSocket;
private Thread socketThread;
private DatagramQueue datagramQueue;
public UDPSocketContext(AddressFamily addressFamily)
{
datagramQueue = new DatagramQueue(addressFamily == AddressFamily.InterNetwork ? IPAddress.Any : IPAddress.IPv6Any);
internalSocket = new Socket(addressFamily, SocketType.Dgram, ProtocolType.Udp);
}
public void Bind(EndPoint endpoint)
{
internalSocket.Bind(endpoint);
socketThread = new Thread(runSocket);
socketThread.Start();
}
public void SendTo(byte[] data, EndPoint remoteEP)
{
internalSocket.SendTo(data, remoteEP);
}
public void SendTo(byte[] data, int length, EndPoint remoteEP)
{
internalSocket.SendTo(data, length, SocketFlags.None, remoteEP);
}
public void Pump()
{
}
public bool Read(out Datagram packet)
{
return datagramQueue.TryDequeue(out packet);
}
public void Close()
{
internalSocket.Close();
}
public void Dispose()
{
Close();
}
private void runSocket()
{
while (true)
{
try
{
datagramQueue.ReadFrom(internalSocket);
}
catch (Exception e)
{
if (e is SocketException)
{
var socketException = e as SocketException;
if (socketException.SocketErrorCode == SocketError.ConnectionReset) continue;
}
return;
}
}
}
}
internal class NetworkSimulatorSocketManager
{
public int LatencyMS = 0;
public int JitterMS = 0;
public int PacketLossChance = 0;
public int DuplicatePacketChance = 0;
public bool AutoTime = true;
public double Time
{
get
{
if (AutoTime)
return DateTime.Now.GetTotalSeconds();
else
return time;
}
}
private Dictionary<EndPoint, NetworkSimulatorSocketContext> sockets = new Dictionary<EndPoint, NetworkSimulatorSocketContext>();
private double time;
public void Update(double time)
{
this.time = time;
}
public NetworkSimulatorSocketContext CreateContext(EndPoint endpoint)
{
var socket = new NetworkSimulatorSocketContext();
socket.Manager = this;
return socket;
}
public void ChangeContext(NetworkSimulatorSocketContext socket, EndPoint endpoint)
{
if (sockets.ContainsKey(endpoint))
throw new SocketException();
sockets.Add(endpoint, socket);
}
public void RemoveContext(EndPoint endpoint)
{
sockets.Remove(endpoint);
}
public NetworkSimulatorSocketContext FindContext(EndPoint endpoint)
{
if (!sockets.ContainsKey(endpoint))
return null;
return sockets[endpoint];
}
}
internal class NetworkSimulatorSocketContext : ISocketContext
{
public int BoundPort
{
get { return ((IPEndPoint)endpoint).Port; }
}
private struct simulatedPacket
{
public double receiveTime;
public byte[] packetData;
public EndPoint sender;
}
public NetworkSimulatorSocketManager Manager;
private EndPoint endpoint;
private List<simulatedPacket> simulatedPackets = new List<simulatedPacket>();
private DatagramQueue datagramQueue = new DatagramQueue(IPAddress.Any);
private object mutex = new object();
private Random rand = new Random();
private bool running = false;
public void Bind(EndPoint endpoint)
{
if (this.endpoint != null && this.endpoint.Equals(endpoint)) return;
this.running = true;
this.endpoint = endpoint;
Manager.ChangeContext(this, this.endpoint);
}
public void SimulateReceive(byte[] packetData, EndPoint sender)
{
if (!running) return;
double receiveTime = Manager.Time;
// add latency+jitter to receive time
receiveTime += (Manager.LatencyMS / 1000.0) + (rand.Next(-Manager.JitterMS, Manager.JitterMS) / 2000.0);
lock (mutex)
{
simulatedPackets.Add(new simulatedPacket()
{
receiveTime = receiveTime,
packetData = packetData,
sender = sender
});
}
}
public void SendTo(byte[] data, EndPoint remoteEP)
{
if (!running) throw new SocketException();
// randomly drop packets
if (rand.Next(100) < Manager.PacketLossChance)
{
return;
}
byte[] temp = new byte[data.Length];
Buffer.BlockCopy(data, 0, temp, 0, data.Length);
var endSocket = Manager.FindContext(remoteEP);
if (endSocket != null)
{
endSocket.SimulateReceive(temp, this.endpoint);
// randomly duplicate packets
if (rand.Next(100) < Manager.DuplicatePacketChance)
endSocket.SimulateReceive(temp, this.endpoint);
}
}
public void SendTo(byte[] data, int length, EndPoint remoteEP)
{
if (!running) throw new SocketException();
byte[] temp = new byte[length];
Buffer.BlockCopy(data, 0, temp, 0, length);
SendTo(temp, remoteEP);
}
public void Pump()
{
if (simulatedPackets.Count > 0)
{
lock (simulatedPackets)
{
// enqueue packets ready to be received
for (int i = 0; i < simulatedPackets.Count; i++)
{
if (Manager.Time >= simulatedPackets[i].receiveTime)
{
var receivePacket = simulatedPackets[i];
simulatedPackets.RemoveAt(i);
byte[] receiveBuffer = BufferPool.GetBuffer(2048);
Buffer.BlockCopy(receivePacket.packetData, 0, receiveBuffer, 0, receivePacket.packetData.Length);
Datagram datagram = new Datagram();
datagram.payload = receiveBuffer;
datagram.payloadSize = receivePacket.packetData.Length;
datagram.sender = receivePacket.sender;
datagramQueue.Enqueue(datagram);
}
}
}
}
}
public bool Read(out Datagram packet)
{
return datagramQueue.TryDequeue(out packet);
}
public void Close()
{
running = false;
Manager.RemoveContext(this.endpoint);
}
public void Dispose()
{
Close();
}
}
}