/// <summary>
/// Create a new socket and try to connect to a remote client/server.
/// </summary>
/// <param name="endPoint">Endpoint that should get connected.</param>
/// <returns>Connected client.</returns>
/// <exception cref="SocketException">If connection fails.</exception>
protected virtual ClientContext CreateAndConnect(IPEndPoint endPoint)
{
var socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.IP);
socket.Connect(endPoint);
return(new ClientContext(socket, BufferPool.Dequeue(), _factory.CreateNewContext(endPoint)));
}
/// <summary>
/// Create a new context and allocate it's buffer.
/// </summary>
/// <param name="socket">The socket.</param>
/// <exception cref="InvalidOperationException">Could not allocate new buffer.</exception>
/// <exception cref="System.Net.Sockets.SocketException">Could not read from socket.</exception>
/// <exception cref="System.ObjectDisposedException">Socket have been disposed.</exception>
protected virtual void SetupNewContext(Socket socket)
{
var context = new ClientContext(socket, BufferPool.Dequeue(),
_factory.CreateNewContext(socket.RemoteEndPoint));
if (context.Buffer == null)
{
throw new InvalidOperationException("Could not allocate new buffer.");
}
socket.BeginReceive(context.Buffer, 0, context.Buffer.Length, SocketFlags.None, OnReceive, context);
}
/// <summary>
/// Start transport.
/// </summary>
/// <exception cref="ArgumentException"><see cref="EndPoint"/> is not of the type expected by the transport implementation</exception>
/// <exception cref="ArgumentNullException"><c>endPoint</c> is null.</exception>
public void Start()
{
if (BufferPool == null)
{
BufferPool = new ObjectPool <byte[]>(() => new byte[65535]);
}
byte[] buffer = BufferPool.Dequeue();
_socket = CreateSocket();
_socket.Bind(_listeningPoint);
_logger.Trace("BeginReceiveFrom");
EndPoint ep = new IPEndPoint(_listeningPoint.Address, _listeningPoint.Port);
_socket.BeginReceiveFrom(buffer, 0, buffer.Length, SocketFlags.None, ref ep, OnRead, buffer);
}
/// <summary>
/// Received a message from remote end point.
/// </summary>
/// <param name="ar"></param>
private void OnRead(IAsyncResult ar)
{
var buffer = (byte[])ar.AsyncState;
EndPoint endPoint = new IPEndPoint(IPAddress.Any, 3929);
int bytesRead = 0;
bool isKeepAlive = true;
try
{
_logger.Trace("_socket.EndReceiveFrom");
bytesRead = _socket.EndReceiveFrom(ar, ref endPoint);
if (bytesRead <= 4)
{
for (int i = 0; i < bytesRead; ++i)
{
if (buffer[i] != '\r' && buffer[i] != '\n')
{
isKeepAlive = false;
break;
}
}
}
else
{
isKeepAlive = false;
}
if (!isKeepAlive)
{
_logger.Debug("Received " + bytesRead + " bytes from " + endPoint + ":\r\n" +
Encoding.ASCII.GetString(buffer, 0, bytesRead));
}
}
catch (Exception err)
{
_logger.Warning("EndReceiveFrom failed: " + err);
}
// begin receiving another packet before starting to process this one
byte[] newBuffer = BufferPool.Dequeue();
try
{
EndPoint localEndPoint = new IPEndPoint(_listeningPoint.Address, _listeningPoint.Port);
_socket.BeginReceiveFrom(newBuffer, 0, newBuffer.Length, SocketFlags.None,
ref localEndPoint, OnRead, newBuffer);
}
catch (Exception err)
{
_logger.Warning("BeginReceiveFrom failed, closing socket. Exception: " + err);
BufferPool.Enqueue(newBuffer);
BufferPool.Enqueue(buffer);
_socket.Close();
return;
}
if (bytesRead == 0 || isKeepAlive)
{
BufferPool.Enqueue(buffer);
return;
}
// Parse buffer.
MessageFactoryContext factoryContext = _parsers.CreateNewContext(endPoint);
try
{
int offset = factoryContext.Parse(buffer, 0, bytesRead);
if (offset != bytesRead)
{
_logger.Error("Failed to parse complete message");
}
}
finally
{
BufferPool.Enqueue(buffer);
_parsers.Release(factoryContext);
}
}