Redémarrage de SignalR après le redémarrage d'une application Web Azure

Question

Je suis confronté à un comportement de reconnexion étrange après le redémarrage d'une application Web Azure qui héberge mon concentrateur SignalR. Lorsque je redémarre, même si l'application redémarre en moins de DisconnectTimeout (testée avec 2 min), le client ne se reconnecte pas.

Est-ce que je fais quelque chose de mal?

code Hub

public class PingHub : Hub 
{ 
    public void Hello() 
    { 
     Clients.All.hello(); 
    } 

    public override Task OnReconnected() 
    { 
     Trace.WriteLine("Reconnect"); 
     return base.OnReconnected(); 
    } 

    public override Task OnConnected() 
    { 
     Trace.WriteLine("Connect"); 
     return base.OnConnected(); 
    } 

} 

Code client

var hubConnection = new HubConnection("http://url/"); 


      hubConnection.TraceLevel = TraceLevels.All; 
      hubConnection.TraceWriter = Console.Out; 

      IHubProxy hubProxy = hubConnection.CreateHubProxy("PingHub"); 

      hubProxy.On("hello",() => Console.WriteLine($"Hello {DateTime.Now.ToString()}")); 

      hubConnection.Reconnected +=() => 
      { 
       Console.WriteLine("Reconnected"); 
      }; 

      hubConnection.Start().Wait(); 

Les journaux de suivi des clients

16:55:48.3999367 - null - ChangeState(Disconnected, Connecting) 
16:55:48.8459354 - 6171c2d4-a9dd-4fa4-b710-0910af48132b - SSE: GET http://gf-test-signalr.azurewebsites.net/signalr/connect?clientProtocol=1.4&transport=serverSentEvents&connectionData=[{"Name":"PingHub"}]&connectionToken=9Vs1ACQjDX%2BQmrcJ2XnoLCCJN%2FDtlJd%2BM0r5o8QvORX50ydXDkrAzeeVUgVIzNc3d7JcDvJ49KmxI3oVPQ%2Bt8IUMJe8HGFAJDasufD%2FFwxEr2l23l40q2dlKVADnFJA5 
16:55:48.9604385 - 6171c2d4-a9dd-4fa4-b710-0910af48132b - SSE: OnMessage(Data: initialized) 
16:55:48.9609355 - 6171c2d4-a9dd-4fa4-b710-0910af48132b - SSE: OnMessage(Data: {"C":"d-B53A1D13-E,0|F,0|G,1","S":1,"M":[]}) 
16:55:49.1059354 - 6171c2d4-a9dd-4fa4-b710-0910af48132b - ChangeState(Connecting, Connected) 
16:55:53.0300013 - 6171c2d4-a9dd-4fa4-b710-0910af48132b - SSE: OnMessage(Data: {}) 
16:56:03.0655798 - 6171c2d4-a9dd-4fa4-b710-0910af48132b - SSE: OnMessage(Data: {}) 
16:56:13.0791344 - 6171c2d4-a9dd-4fa4-b710-0910af48132b - SSE: OnMessage(Data: {}) 
16:56:23.0965041 - 6171c2d4-a9dd-4fa4-b710-0910af48132b - SSE: OnMessage(Data: {}) 
16:56:26.7919383 - 6171c2d4-a9dd-4fa4-b710-0910af48132b - ChangeState(Connected, Reconnecting) 
16:56:26.7939373 - 6171c2d4-a9dd-4fa4-b710-0910af48132b - SSE: GET http://gf-test-signalr.azurewebsites.net/signalr/reconnect?clientProtocol=1.4&transport=serverSentEvents&connectionData=[{"Name":"PingHub"}]&connectionToken=9Vs1ACQjDX%2BQmrcJ2XnoLCCJN%2FDtlJd%2BM0r5o8QvORX50ydXDkrAzeeVUgVIzNc3d7JcDvJ49KmxI3oVPQ%2Bt8IUMJe8HGFAJDasufD%2FFwxEr2l23l40q2dlKVADnFJA5&messageId=d-B53A1D13-E%2C0%7CF%2C0%7CG%2C1 
16:56:26.8962939 - 6171c2d4-a9dd-4fa4-b710-0910af48132b - OnError(Microsoft.AspNet.SignalR.Client.HttpClientException: StatusCode: 503, ReasonPhrase: 'Service Unavailable', Version: 1.1, Content: System.Net.Http.StreamContent, Headers: 
{ 
    Date: Tue, 15 Nov 2016 16:56:22 GMT 
    Set-Cookie: ARRAffinity=9fa33f4c59eaa0cb53ffc0472e2395fa67ff17a0f59613b57fb963b1519ab999;Path=/;Domain=gf-test-signalr.azurewebsites.net 
    Server: Microsoft-IIS/8.0 
    Content-Length: 326 
    Content-Type: text/html; charset=us-ascii 
} 
    at Microsoft.AspNet.SignalR.Client.Http.DefaultHttpClient.<>c__DisplayClass5_0.<Get>b__1(HttpResponseMessage responseMessage) 
    at Microsoft.AspNet.SignalR.TaskAsyncHelper.<>c__DisplayClass31_0`2.<Then>b__0(Task`1 t) 
    at Microsoft.AspNet.SignalR.TaskAsyncHelper.TaskRunners`2.<>c__DisplayClass3_0.<RunTask>b__0(Task`1 t)) 
16:56:28.9148136 - 6171c2d4-a9dd-4fa4-b710-0910af48132b - SSE: GET http://gf-test-signalr.azurewebsites.net/signalr/reconnect?clientProtocol=1.4&transport=serverSentEvents&connectionData=[{"Name":"PingHub"}]&connectionToken=9Vs1ACQjDX%2BQmrcJ2XnoLCCJN%2FDtlJd%2BM0r5o8QvORX50ydXDkrAzeeVUgVIzNc3d7JcDvJ49KmxI3oVPQ%2Bt8IUMJe8HGFAJDasufD%2FFwxEr2l23l40q2dlKVADnFJA5&messageId=d-B53A1D13-E%2C0%7CF%2C0%7CG%2C1 
16:56:29.0051243 - 6171c2d4-a9dd-4fa4-b710-0910af48132b - OnError(Microsoft.AspNet.SignalR.Client.HttpClientException: StatusCode: 503, ReasonPhrase: 'Service Unavailable', Version: 1.1, Content: System.Net.Http.StreamContent, Headers: 
{ 
    Date: Tue, 15 Nov 2016 16:56:24 GMT 
    Server: Microsoft-IIS/8.0 
    Content-Length: 326 
    Content-Type: text/html; charset=us-ascii 
} 
    at Microsoft.AspNet.SignalR.Client.Http.DefaultHttpClient.<>c__DisplayClass5_0.<Get>b__1(HttpResponseMessage responseMessage) 
    at Microsoft.AspNet.SignalR.TaskAsyncHelper.<>c__DisplayClass31_0`2.<Then>b__0(Task`1 t) 
    at Microsoft.AspNet.SignalR.TaskAsyncHelper.TaskRunners`2.<>c__DisplayClass3_0.<RunTask>b__0(Task`1 t)) 
16:56:31.0165736 - 6171c2d4-a9dd-4fa4-b710-0910af48132b - SSE: GET http://gf-test-signalr.azurewebsites.net/signalr/reconnect?clientProtocol=1.4&transport=serverSentEvents&connectionData=[{"Name":"PingHub"}]&connectionToken=9Vs1ACQjDX%2BQmrcJ2XnoLCCJN%2FDtlJd%2BM0r5o8QvORX50ydXDkrAzeeVUgVIzNc3d7JcDvJ49KmxI3oVPQ%2Bt8IUMJe8HGFAJDasufD%2FFwxEr2l23l40q2dlKVADnFJA5&messageId=d-B53A1D13-E%2C0%7CF%2C0%7CG%2C1 
16:56:56.7950186 - 6171c2d4-a9dd-4fa4-b710-0910af48132b - OnError(System.TimeoutException: Couldn't reconnect within the configured timeout of 00:00:30, disconnecting.) 
16:56:56.7959897 - 6171c2d4-a9dd-4fa4-b710-0910af48132b - Disconnected 
16:56:56.8103502 - 6171c2d4-a9dd-4fa4-b710-0910af48132b - Transport.Dispose(6171c2d4-a9dd-4fa4-b710-0910af48132b) 
16:56:56.8108527 - 6171c2d4-a9dd-4fa4-b710-0910af48132b - Closed 

Answer 1

16: 56: 56,7950186 - 6171c2d4-a9dd-4fa4-b710-0910af48132b - OnError (System.TimeoutException:. Impossible de reconnecter dans le délai configuré de 00:00:30, en déconnectant)

En ce qui concerne comme je le sais, la valeur par défaut de DisconnectTimeout est de 30 secondes. Et selon les journaux, la reconnexion prend environ 30 secondes, donc s'il vous plaît vérifier si vous set/change DisconnectTimeout setting in Application_Start.

GlobalHost.Configuration.DisconnectTimeout = TimeSpan.FromSeconds(30); 

Par ailleurs, si vous voulez vous reconnecter en permanence au moyeu après a été perdu une connexion, vous pouvez appeler la méthode de démarrage du gestionnaire d'événements déconnecté. Pour plus d'informations, reportez-vous à "How to continuously reconnect".