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TcpClient.cs
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TcpClient.cs
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using FlexNet.Core;
using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
namespace FlexNet.Templates.SimpleTCP
{
public class TcpClient : IClient
{
private struct PacketSendInfo
{
public object obj;
public Type t;
public PacketDefinition def;
}
public ProtocolDefinition Protocol { private get; set; }
public event PacketReceived OnPacketReceived;
public delegate void PacketReceived(object data, Type packetType);
private System.Net.Sockets.TcpClient _client;
private bool _isRemoteClient; // If this Client was Created using a Pre-Accepted Client.
private CancellationTokenSource _cts;
private Task readTask;
private Task writeTask;
private NetworkStream _stream;
private Queue<PacketSendInfo> _sendQueue;
private SemaphoreSlim _streamSemaphore;
/// <summary>
/// Create a Client using a Pre-accepted TcpClient
/// </summary>
/// <param name="client">the Pre-Accepted client.</param>
internal TcpClient(System.Net.Sockets.TcpClient client, ProtocolDefinition def, PacketReceived packetReceived)
{
_cts = new CancellationTokenSource();
_client = client;
_stream = _client.GetStream();
_isRemoteClient = true;
_sendQueue = new Queue<PacketSendInfo>();
_streamSemaphore = new SemaphoreSlim(1, 1);
Protocol = def;
OnPacketReceived += packetReceived;
SetupThreads();
}
public TcpClient()
{
_client = new System.Net.Sockets.TcpClient();
_isRemoteClient = false;
_cts = new CancellationTokenSource();
_isRemoteClient = false;
_sendQueue = new Queue<PacketSendInfo>();
_streamSemaphore = new SemaphoreSlim(1, 1);
}
public void Connect(IPEndPoint remoteEP)
{
if (_isRemoteClient)
throw new InvalidOperationException("Remote Clients may not be reconnected");
_cts.Cancel();
_cts = new CancellationTokenSource();
_client.Connect(remoteEP);
_stream = _client.GetStream();
SetupThreads();
}
public void SendPacket<T>(T obj) => SendPacket(typeof(T), obj);
public void SendPacket(Type t, object obj)
{
var def = Protocol.Packets.FirstOrDefault(x => x.Binding == t);
if (def.Id == null)
throw new ArgumentException($"Unknown Packet Type \"{t.FullName}\"", nameof(t));
_sendQueue.Enqueue(new PacketSendInfo()
{
t = t,
obj = obj,
def = def
});
}
private void SetupThreads()
{
readTask = ReadLoop(_cts.Token);
writeTask = WriteLoop(_cts.Token);
}
private async Task WriteLoop(CancellationToken ct)
{
while (!ct.IsCancellationRequested)
{
while (_sendQueue.Count <= 0)
await Task.Delay(10);
var info = _sendQueue.Dequeue();
using (var initDataStream = new MemoryStream())
{
Protocol.IdHeader.Write(initDataStream, Protocol.IdResolver.MapPacketToId(info.def));
info.def.WriteDelegate(initDataStream, info.obj);
using (var lengthStream = new MemoryStream())
{
Protocol.LengthHeader.Write(lengthStream, (int)initDataStream.Position);
initDataStream.Position = 0;
await initDataStream.CopyToAsync(lengthStream);
int totalLength = (int)lengthStream.Position;
lengthStream.Position = 0;
await _streamSemaphore.WaitAsync();
try
{
await lengthStream.CopyToAsync(_stream, totalLength, ct);
}
finally
{
_streamSemaphore.Release();
}
}
}
}
}
private async Task ReadLoop(CancellationToken ct)
{
while (!ct.IsCancellationRequested)
{
while (_client.Available <= 0)
await Task.Delay(10);
int length;
byte[] data;
await _streamSemaphore.WaitAsync(ct);
try
{
length = Protocol.LengthHeader.Read(_stream);
data = new byte[length];
await _stream.ReadAsync(data, 0, length);
}
finally
{
_streamSemaphore.Release();
}
using (var stream = new MemoryStream(data))
{
var id = Protocol.IdHeader.Read(stream);
var packetDef = Protocol.IdResolver.MapIdToPacket(id);
var obj = packetDef.ReadDelegate(stream);
OnPacketReceived?.Invoke(obj, packetDef.Binding);
}
}
}
public void Dispose()
{
_sendQueue.Clear();
_cts.Cancel();
_cts?.Dispose();
_client?.Dispose();
_stream?.Dispose();
_streamSemaphore?.Dispose();
}
}
}