private void Parse(MessageFactoryContext context, string message, int offset)
{
byte[] bytes = Encoding.ASCII.GetBytes(message);
if (offset == 0)
{
context.Parse(bytes, 0, bytes.Length);
}
else
{
context.Parse(bytes, 0, offset);
context.Parse(bytes, offset, bytes.Length - offset);
}
}
/// <summary>
/// Parse all complete requests in buffer.
/// </summary>
/// <param name="bytesLeft"></param>
/// <returns>offset in buffer where parsing stopped.</returns>
/// <exception cref="InvalidOperationException">Parsing failed.</exception>
private int ParseBuffer(int bytesLeft)
{
int offset = MessageFactoryContext.Parse(_buffer, 0, bytesLeft);
bytesLeft -= offset;
// try another pass if we got bytes left.
if (bytesLeft <= 0)
{
return(offset);
}
// Continue until offset is not changed.
int oldOffset = 0;
while (offset != oldOffset)
{
oldOffset = offset;
_logger.Trace("Parsing from index " + offset + ", " + bytesLeft + " bytes.");
offset = MessageFactoryContext.Parse(_buffer, offset, bytesLeft);
bytesLeft -= offset;
}
return(offset);
}
/// <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);
}
}
