SendAsync was using InvokeCoreAsync code to send messages. In case of exception InvokeCoreAsync is blocking and returns a task to the user so they can await for the remote call to complete. Any exception thrown is caught and used to fail the task returned to the user. SendAsync does not return a special task to the user so re-using InvokeCore resulted in swallowing exceptions. While SendAsync is fire and forget it actually should throw if the message could not be send and it was not happening.
While adding tests it turned out we did not test cases where Invoke/SendAsync/StreamAsync were invoked before starting the connection and this resulted in a NullReferenceException. I also fixed that.
- Preventing from closing long polling transport with 204 in case of
error
- Reporting an error to the client if WebSocket was not closed normally
Note in case of ServerSentEvents it is not possible on the client to
tell the difference between when the server closed event stream due to
an exception or because the client left OnConnectedAsync. In both cases
the client sees only that the stream was closed.
Part of: #163
* Split http and non-http layers
- This change introduces Microsoft.AspNetCore.SignalR.Http
and Microsoft.AspNetCore.Sockets.Http which expose extension methods
on IAppBuilder for wiring up a sockets and signalr pipeline.
* Progress towards splitting the layers
- This is based on the work anurse did in anurse/endpoint-middleware-spike to
introduce a connection middleware pipeline that mimics much of our http
pipeline. The intent is that this layer will be generic enough to build both
SignalR and Kestrel on top of but we're not there yet. This change makes incremental
progress towards splitting apart sockets and http so that we can add the tcp transport
without breaking everything all at once.
- Created Microsoft.AspNetCore.Sockets.Abstractions where the primitives for
sockets live. That includes, ConnectionContext (formerly Connection), EndPoint,
ISocketBuilder, SocketDelegate, etc.
- ConnectionContext isn't in it's final form as yet, it still very closely mirrors
the original Connection object we had so that tests continue to pass.
- The HttpConnectionDispatcher doesn't know about EndPoint anymore, it just cares
about invoking the SocketDelegate.
- EndPointOptions has been removed as part of this change as it coupled http specific configuration
to the end point type. There's a new HttpSocketOptions that needs to be passed into MapSocket calls.
- Updated the tests to deal with the API changes.
- We're now using the routing system in a very vanilla way now that
we're not using the URL space as part of the protocol.
- Removed the path argument from the HttpConnectionDispatcher (simplifies code and removes duplication from tests)
Pranav K
Pawel Kadluczka
BrennanConroy
Pawel Kadluczka
Nate McMaster
moozzyk
Mikael Mengistu
David Fowler
Andrew Stanton-Nurse