private async Task ProcessSendQueue()
{
string item = "";
lock ((_sendQueue as ICollection).SyncRoot)
{
if (_sendQueue.Count == 0)
{
return;
}
item = _sendQueue[0];
_sendQueue.RemoveAt(0);
}
var bytes = new List <byte>();
var data = Encoding.UTF8.GetBytes(item);
var header = WebSocketHeader.Create(true, OpCode.Text, data.Length);
bytes.AddRange(header.ToBinary());
bytes.AddRange(data);
var arr = bytes.ToArray();
try
{
await _stream.WriteAsync(arr, 0, arr.Length).ConfigureAwait(false);
}
catch (IOException e) when(e.InnerException is SocketException)
{
Debug.WriteLine(e.Message);
}
}
public static WebSocketHeader Create(bool fin, OpCode opCode, int payloadLength)
{
var header = new WebSocketHeader();
header.Fin = fin;
header.Rcv1 = 0;
header.Rcv2 = 0;
header.Rcv3 = 0;
header.OpCode = opCode;
header.Mask = false;
header.PayloadLength = payloadLength;
return(header);
}
private void OnTextFrameReceived(ReadOnlySpan <byte> span, WebSocketHeader header)
{
if (header.PayloadLength <= 125)
{
if (header.Mask)
{
string text = DecodeText(span);
TextDataReceived?.Invoke(text);
}
}
else if (header.PayloadLength == 126)
{
// TODO:
}
else if (header.PayloadLength == 127)
{
// TODO:
}
}
public static WebSocketHeader Parse(ReadOnlySpan <byte> span)
{
var header = new WebSocketHeader();
if (span.Length < 2)
{
return(header);
}
byte[] bytes = span.Slice(0, 2).ToArray();
header.Fin = (bytes[0] >> 7) == 1;
header.Rcv1 = (byte)(bytes[0] >> 6 & 1);
header.Rcv2 = (byte)(bytes[0] >> 5 & 1);
header.Rcv3 = (byte)(bytes[0] >> 4 & 1);
header.OpCode = (OpCode)(bytes[0] & 0x0f);
header.Mask = (bytes[1] >> 7) == 1;
header.PayloadLength = bytes[1] & 0x7f;
return(header);
}
private void OnDataFrameReceived(ReadOnlySpan <byte> span)
{
// Console.WriteLine("--------------------------------------------------");
// Console.WriteLine(string.Join(" ", span.ToArray().Select(x => x.ToString("X2"))));
var header = WebSocketHeader.Parse(span);
Console.WriteLine(header);
switch (header.OpCode)
{
case OpCode.Text:
OnTextFrameReceived(span, header);
break;
case OpCode.Close:
OnCloseReceived();
break;
}
}