// handle a websocket frame. Returns false if frame is continue, true otherwise
private async Task <bool> HandleFrame(Frame frame)
{
// the frame is fragmented
if (frame.Opcode == OpCode.Continue)
{
return(false);
// return with pong
}
else if (frame.Opcode == OpCode.Ping)
{
await SendFrame(OpCode.Pong, frame.Data);
// handle ping request by client
}
else if (frame.Opcode == OpCode.Pong)
{
if (pingQueue.Count > 0)
{
pingQueue.Dequeue()(frame.Data);
}
// client is requesting close, echo back and close connection
}
else if (frame.Opcode == OpCode.Close)
{
CloseFrame closeFrame = Framing.ParseClose(frame.Data);
await SendFrame(OpCode.Close, frame.Data);
client.Dispose(); // dispose the client (close the socket)
if (server.GetClients().Contains(this))
{
server.GetClients().Remove(this);
}
OnClose(closeFrame.Code, closeFrame.Reason);
// handle text and binary data
}
else
{
OnMessage(frame.Data);
}
// packet was successfull handling
return(true);
}
public static CloseFrame ParseClose(byte[] data)
{
CloseFrame frame = new CloseFrame();
// parse code
frame.Code = (data[0] & 0xff) << 8;
frame.Code |= (data[1] & 0xff) << 0;
// parse reason
byte[] reason = new byte[data.Length - 2];
for (int i = 2; i < data.Length; i++)
{
reason[i - 2] = data[i];
}
frame.Reason = Encoding.UTF8.GetString(reason);
// return pased close frame
return(frame);
}