internal async Task ProcessWebSocketRequestAsync(WebSocket webSocket, CancellationToken disconnectToken, Func <object, Task <WebSocketMessage> > messageRetriever, object state)
{
bool closedReceived = false;
try
{
// first, set primitives and initialize the object
WebSocket = webSocket;
OnOpen();
// dispatch incoming messages
while (!disconnectToken.IsCancellationRequested && !closedReceived)
{
WebSocketMessage incomingMessage = await messageRetriever(state).PreserveCulture();
switch (incomingMessage.MessageType)
{
case WebSocketMessageType.Binary:
OnMessage((byte[])incomingMessage.Data);
break;
case WebSocketMessageType.Text:
OnMessage((string)incomingMessage.Data);
break;
default:
closedReceived = true;
// If we received an incoming CLOSE message, we'll queue a CLOSE frame to be sent.
// We'll give the queued frame some amount of time to go out on the wire, and if a
// timeout occurs we'll give up and abort the connection.
await Task.WhenAny(CloseAsync(), Task.Delay(_closeTimeout)).PreserveCulture();
break;
}
}
}
catch (OperationCanceledException ex)
{
// ex.CancellationToken never has the token that was actually cancelled
if (!disconnectToken.IsCancellationRequested)
{
Error = ex;
OnError();
}
}
catch (ObjectDisposedException)
{
// If the websocket was disposed while we were reading then noop
}
catch (Exception ex)
{
if (IsFatalException(ex))
{
Error = ex;
OnError();
}
}
try
{
#if CLIENT
var webSocketState = GetWebSocketState(WebSocket);
if (webSocketState == WebSocketState.Closed ||
webSocketState == WebSocketState.Aborted)
{
// No-op if the socket is already closed or aborted
}
else
{
// Initiate the WebSocket closing handshake. Only the client should ever do this.
await WebSocket.CloseAsync(WebSocketCloseStatus.NormalClosure, "", CancellationToken.None).PreserveCulture();
}
#endif
}
finally
{
#if CLIENT
WebSocket.Dispose();
#endif
OnClose();
}
}
private static bool TryGetMessage(WebSocketReceiveResult receiveResult, byte[] buffer, out WebSocketMessage message)
{
message = null;
if (receiveResult.MessageType == WebSocketMessageType.Close)
{
message = WebSocketMessage.CloseMessage;
}
else if (receiveResult.EndOfMessage)
{
// we anticipate that single-fragment messages will be common, so we optimize for them
switch (receiveResult.MessageType)
{
case WebSocketMessageType.Binary:
if (buffer == null)
{
message = WebSocketMessage.EmptyBinaryMessage;
}
else
{
message = new WebSocketMessage(BufferSliceToByteArray(buffer, receiveResult.Count), WebSocketMessageType.Binary);
}
break;
case WebSocketMessageType.Text:
if (buffer == null)
{
message = WebSocketMessage.EmptyTextMessage;
}
else
{
message = new WebSocketMessage(BufferSliceToString(buffer, receiveResult.Count), WebSocketMessageType.Text);
}
break;
default:
throw new InvalidOperationException("Unknown message type");
}
}
return(message != null);
}
