public Task ProcessRequestAsync(IDictionary<string, object> env)
{
object value;
WebSocket webSocket;
// Try to get the websocket context from the environment
if (!env.TryGetValue(typeof(WebSocketContext).FullName, out value))
{
webSocket = new OwinWebSocket(env);
}
else
{
webSocket = ((WebSocketContext)value).WebSocket;
}
var handler = new DefaultWebSocketHandler();
var task = handler.ProcessWebSocketRequestAsync(webSocket);
_callback(handler).Catch()
.ContinueWith(t => handler.End());
return task;
}
private void RunWebSocketHandler(DefaultWebSocketHandler handler, CancellationTokenSource cts)
{
// async void methods are not supported in ASP.NET and they throw a InvalidOperationException.
Task.Run(async () =>
{
try
{
await _callback(handler);
}
catch
{
// This error was already handled by other layers
// we can no-op here so we don't cause an unobserved exception
}
// Always try to close async, if the websocket already closed
// then this will no-op
await handler.CloseAsync();
// Cancel the token
cts.Cancel();
});
}
public Task ProcessRequest(IDictionary<string, object> environment)
{
object value;
WebSocket webSocket;
// Try to get the websocket context from the environment
if (!environment.TryGetValue(typeof(WebSocketContext).FullName, out value))
{
webSocket = new OwinWebSocket(environment);
}
else
{
webSocket = ((WebSocketContext)value).WebSocket;
}
var cts = new CancellationTokenSource();
var webSocketHandler = new DefaultWebSocketHandler(_maxIncomingMessageSize);
var task = webSocketHandler.ProcessWebSocketRequestAsync(webSocket, cts.Token);
RunWebSocketHandler(webSocketHandler, cts);
return task;
}
public async Task DefaultWebSocketHandlerOperationsNoopAfterClose()
{
var handler = new DefaultWebSocketHandler(maxIncomingMessageSize: null,
logger: new Mock<ILogger>().Object);
var initialWebSocket = new Mock<WebSocket>();
initialWebSocket.Setup(w => w.CloseOutputAsync(WebSocketCloseStatus.NormalClosure, "", CancellationToken.None))
.Returns(TaskAsyncHelper.Empty);
initialWebSocket.Setup(w => w.CloseAsync(WebSocketCloseStatus.NormalClosure, "", CancellationToken.None))
.Returns(TaskAsyncHelper.Empty);
initialWebSocket.Setup(w => w.ReceiveAsync(It.IsAny<ArraySegment<byte>>(), CancellationToken.None))
.Returns(Task.FromResult(new WebSocketReceiveResult(0, WebSocketMessageType.Close, endOfMessage: true)));
await handler.ProcessWebSocketRequestAsync(initialWebSocket.Object, CancellationToken.None);
// Swap the socket here so we can verify what happens after the task returns
var afterWebSocket = new Mock<WebSocket>();
handler.WebSocket = afterWebSocket.Object;
await handler.Send(new ArraySegment<byte>(Encoding.UTF8.GetBytes("Hello World")));
await handler.CloseAsync();
afterWebSocket.Verify(m => m.State, Times.Never());
afterWebSocket.Verify(m => m.SendAsync(It.IsAny<ArraySegment<byte>>(), WebSocketMessageType.Text, true, CancellationToken.None), Times.Never());
afterWebSocket.Verify(m => m.CloseOutputAsync(WebSocketCloseStatus.NormalClosure, "", CancellationToken.None), Times.Never());
}
private async Task AcceptWebSocketRequest(ITransportConnection connection)
{
var handler = new DefaultWebSocketHandler(_maxIncomingMessageSize, Logger);
// Configure event handlers before calling ProcessWebSocketRequestAsync
_socket = handler;
_socket.OnClose = _closed;
_socket.OnMessage = _message;
_socket.OnError = _error;
WebSocket webSocket;
try
{
webSocket = await Context.AcceptWebSocketAsync();
}
catch
{
// Bad Request
_context.Response.StatusCode = 400;
await _context.Response.WriteAsync(Resources.Error_NotWebSocketRequest);
return;
}
// Start the websocket handler so that we can process things over the channel
var webSocketHandlerTask = handler.ProcessWebSocketRequestAsync(webSocket, CancellationToken);
// This needs to come after wiring up the websocket handler
var ignoredTask = ProcessRequestCore(connection)
.ContinueWith(async (_, state) =>
{
await ((DefaultWebSocketHandler)state).CloseAsync();
},
handler);
await webSocketHandlerTask;
}