Question

57

How to handle SignalR server exception at client?

rated 0 times [ 63] [ 6] / answers: 1 / hits: 25567 / 8 Years ago, mon, march 21, 2016, 12:00:00

The error handler is added like this at client:

$.connection.hub.url = /signalr;

$.connection.hub.logging = true;

$.connection.hub.error(function(error) {

    console.log('SignalrAdapter: ' + error);

});



$.connection.hub.start().done(function() { me.onStartDone(); });

// ...

At server it is:

hubConfiguration.EnableDetailedErrors = true;

Accordingly to the docs this should be enough.

At my exception throwing it just displays a log text for it and does not invoke the handler:

[18:18:19 GMT+0000()] SignalR: ... [[[my error description here]]] ...

At my cshtml page:

<script src=~/Scripts/vendor/jquery.signalR-2.1.2.js></script>

<script src=~/signalr/hubs></script>

However if I attach an error handler to the method itself it is got called:

$.connection.operatorHub.server.myMethodName(someParam).fail(function(error) {

    console.log(Error handler called:  + error);

});

How to handle a general error?

UPDATE.
The answer is below. Also see these:

http://www.asp.net/signalr/overview/guide-to-the-api/hubs-api-guide-server#handleErrors

SignalR, Owin and exception handling

Hope it helps someone.

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triston

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4 Years ago

answered 8 Years ago devinjadong · Accepted Answer

I tested on a little chat project (downloaded here) it seems this method handle only connection errors.

$.connection.hub.error(function(error) {

    console.log('SignalrAdapter: ' + error);

});

I was able to handle all exceptions with the HubPipelineModule class.

1) I created a SOHubPipelineModule

public class SOHubPipelineModule : HubPipelineModule

{

    protected override void OnIncomingError(ExceptionContext exceptionContext,

                                            IHubIncomingInvokerContext invokerContext)

    {

        dynamic caller = invokerContext.Hub.Clients.Caller;

        caller.ExceptionHandler(exceptionContext.Error.Message);

    }

}

2) I Added the module to GlobalHost.HubPipeline

  // Any connection or hub wire up and configuration should go here

  GlobalHost.HubPipeline.AddModule(new SOHubPipelineModule());

  var hubConfiguration = new HubConfiguration { EnableDetailedErrors = true };

  app.MapSignalR(hubConfiguration);

3) My ChatHub class :

 public class ChatHub : Hub

    {

        public void Send(string name, string message)

        {

            throw new Exception(exception for Artyom);

            Clients.All.broadcastMessage(name, message);

        }



    }

4) In the js I use this code to get my exception message :

$.connection.chatHub.client.exceptionHandler = function (error) {

      console.log('SignalrAdapter: ' + error);

      alert('SignalrAdapter: ' + error);

};