/**
* Do async read on client
* Added for debugging purposes
* Doesn't do much yet
*/
private void MonitorClient(TcpClient client)
{
try {
byte[] buffer = new byte[512];
WsCallbackState state = new WsCallbackState(client, buffer);
client.GetStream().BeginRead(buffer, 0, buffer.Length, new AsyncCallback(ClientDataCallback), state);
} catch (Exception) {
}
}
/**
* Async callback for data sent by client
*/
private void ClientDataCallback(IAsyncResult state)
{
try {
WsCallbackState cs = (WsCallbackState)state.AsyncState;
NetworkStream stream = cs.client.GetStream();
int bytes = stream.EndRead(state);
if (bytes > 0)
{
byte[] frames = new byte[bytes];
Array.Copy(cs.buffer, 0, frames, 0, bytes);
bool closed = false;
try {
// decode client message
WsDataFrame frame = FramesToMessage(frames);
if (frame.opcode == 0x8) // close frame
{
int close_code = 0;
if (frame.payload.Length == 2)
{
close_code = ((frame.payload[0] & 0xff) << 8) + (frame.payload[1] & 0xff);
}
byte[] close_msg = WsDataFrame.CloseFrame(close_code);
stream.Write(close_msg, 0, close_msg.Length);
cs.client.Close();
_clients.Remove(cs.client);
closed = true;
}
else if (frame.opcode == 0x9) // ping frame
{
byte[] pong_msg = WsDataFrame.PongFrame(frame.payload);
stream.Write(pong_msg, 0, pong_msg.Length);
}
} catch (WsFatalClientException ex) {
// client did something wrong. kill connection
if (_verbose > 0)
{
System.Console.WriteLine(ex);
}
cs.client.Close();
_clients.Remove(cs.client);
closed = true;
} catch (Exception ex) {
if (_verbose > 0)
{
System.Console.WriteLine(ex);
}
}
if (!closed)
{
MonitorClient(cs.client);
}
}
else // zero-bytes read implies closed connection, I think
{
cs.client.Close();
_clients.Remove(cs.client);
}
} catch (Exception) {
}
}
