Xamarin push notifications using signalr abpcommonhubpath /signalr #11335 | Support Center

mgcode created 2 years ago

Prerequisites

What is your product version? v11.3.0
What is your product type (Angular or MVC)? MVC
What is product framework type (.net framework or .net core)? .net core

Hi,

I use notificationPublisher to send a notification to all users using the below code and it works for the web application. await _notificationPublisher.PublishAsync(AppNotificationNames.NewIncident, notificationData,severity: NotificationSeverity.Warn);

But when I connect, using signalr, to abpcommonhub in xamarin application (connection established successfully based on https://support.aspnetzero.com/QA/Questions/6841/Push-notification-implementation-in-Xamarin-Mobile-application) and subscribe to above notification message, I cannot receive it with the below hubconnection message subscription code. HubConnection.On(AppNotificationNames.NewIncident, (message) => { Console.WriteLine("TEST"); });

Below is the code of NotificationService in Xamarin application.

public class NotificationService : ISingletonDependency, INotificationService { public HubConnection HubConnection { get; }

private readonly IAccessTokenManager _accessTokenManager;
private bool _isConnecting;

public NotificationService(IAccessTokenManager accessTokenManager)
{
    try
    {
        _accessTokenManager = accessTokenManager;

        HubConnection = new HubConnectionBuilder()
            .WithUrl(CreateHubUrl(),

            (opts) =>
                {
                    opts.HttpMessageHandlerFactory = (message) =>
                    {
                        if (message is HttpClientHandler clientHandler)
                            // bypass SSL certificate
                            clientHandler.ServerCertificateCustomValidationCallback +=
                                (sender, certificate, chain, sslPolicyErrors) => { return true; };
                        return message;
                    };
                }
            )
            .ConfigureLogging(logging => {
                logging.SetMinimumLevel(LogLevel.Debug);
                logging.AddConsole();
                logging.AddDebug();
            })
            .Build();


        HubConnection.On<string>(AppNotificationNames.NewIncident, (message) =>
        {
            Console.WriteLine("TEST");
        });


        HubConnection.Closed += TryToConnectIfNeeds;

        ConnectAsync().ConfigureAwait(true);
    }
    catch (Exception ex)
    {
        ExceptionHandler.LogException(ex);
    }
}

private async Task TryToConnectIfNeeds(Exception connectionException)
{
    try
    {
        ExceptionHandler.LogException(connectionException);

        if (!_accessTokenManager.IsUserLoggedIn)
        {
            return;
        }

        await Task.Delay(new Random().Next(0, 5) * 1000);
        await HubConnection.StartAsync();
    }
    catch (Exception ex)
    {
        ExceptionHandler.LogException(ex);
    }
}

public async Task<bool> ConnectAsync()
{
    try
    {
        if (HubConnection.State == HubConnectionState.Connected)
        {
            return true;
        }

        if (_isConnecting)
        {
            return false;
        }

        _isConnecting = true;

        await HubConnection.StartAsync();

        Console.WriteLine(@"Connected!");
        return true;
    }
    catch (Exception ex)
    {
        ExceptionHandler.LogException(ex);
        return false;
    }
    finally
    {
        _isConnecting = false;
    }
}


public async Task<bool> DisconnectAsync()
{
    try
    {
        if (HubConnection.State == HubConnectionState.Disconnected)
        {
            return true;
        }

        await HubConnection.StopAsync();

        Console.WriteLine(@"Disconnected!");
        return true;
    }
    catch (Exception ex)
    {
        ExceptionHandler.LogException(ex);
        return false;
    }
}

private string CreateHubUrl()
{
    string accessToken = _accessTokenManager.AuthenticateResult.EncryptedAccessToken;
    return ApiUrlConfig.BaseUrl +
           AppConsts.SignalRAbpCommonHubPath.TrimStart('/')
           + "?" +
           AppConsts.EncryptedAuthTokenQueryStringName + "=" +
           Uri.EscapeDataString(accessToken);
}

Could you please help me?
Thank you in advance!

14 Answer(s)

0
admin created 2 years ago
Hi,

Did you start the host app using the bat file included under YourPRojectName.Host/ folder ?

Could you also share the result of CreateHubUrl method ?

Thanks,
0
mgcode created 2 years ago
Hi,

I start Web.Host from Visual Studio with Mobile profile, but I tried the bat file also. The CreateHubUrl result is https://10.0.2.2:44301/signalr?enc_auth_token=Jqd586PETXlUKqd7js8a6xjlbaFHQkj%2F9v3QPtCkH%2BS9y7AGW%2FP27nGie6aesVvtENCI6ic4msJ5MYbjR5mSchJZiTX1xJw%2BnVT8jMo7nhhvmgc7DhggTkjY36wZT97eWJaZiBgpL4hrTZAjC2xiMetYpgZsOieRACbXIgwpcnJ59X4XtXfgCOAXwpo5ZrxS4N3GtCAqu2aEwHFRX3XFgS870AxMtG5YQjAV2e%2FAnNz0JlXyLROBR1WKuKb5E5Q4jNABhHOCm4r55SO6wzIe1sFikWSx6nM0qF7AkX%2FMg21HyE0aepBfMjUnp2N2XeZBmNdnz9zK07%2FnBZ%2F5qhY%2Byo4GmZW0joYOg4YBvUAKQgrPcIoifB3VhaWGBg0fypfFcrJIRrF0qm5I5J%2BN3e5WpMmjfKXw0GP9jfAfYzBG5zotKNH%2Bzo6QKh1naSVpYYFo8hdBgsXukskwT46xJhFdL8cUqdmdZa9kAkJc4lkSA5hPf2BF1JdAAeCwOaCE6DEZCY%2FamSY33Hx1hdJVHpGbEP9c4GsXxoeWV%2BxO5fOCmajkJ5j9V3P5RSsdjjeuiQCDQcGLwhUFgmF%2Bk8nYA2ysPyWwme1e1%2Bc7WC1okDc3hAwUqBAhL4sZla4TMb4OIUiR1uPnNwUnM7DYrdy3I0mGbA4Bug9eoS2dPPCfTsuIZbbfr52YLOMG0a79kIfuvz1C810rx8%2B%2FeZbtluZd%2FvZ3sDUQVI8fj6NZ91ADLUUCC7FSbAsJvOmkmsYqm1nsyrM6jZbCqC5Dcsa%2Bb4OrimVz1ZGLHSMb6bFSdnZiQ1Lj54qk0xkuwBr%2FHt7HiHwZCM6HccfOCgRG%2BLzNiC9GEYd%2Bjt1%2FKblxBIbXv1wlC5mwLhXVaDC2%2Bu0gq%2BbZzHShVv3J%2B%2F%2FJWJU8fk%2FVD4UL6QT134zeGUHKQWBZ5PcLfTDSCyy4aKct%2FSQpHQg%2BuyiwGsj0qyh3Ih%2B4SFJ3eBtf446nNAKop8mhSZNN313ZoAUbqVUvkiS2YhoCAN%2FNp0C%2FzDGMwl2Olgz3L%2FSuq7CqeRhT4s3sk6%2B6OiAtK3ZD2ZoXlcicnW3sTffFRAt0tz8vw4bDEH4atH1BgxM7tx0Ifk5LRVtXpvIn837fNts4Zcr7xva3Yc1pJstqenV7dZuDhQQJi01CIO%2F8HdZieo%2FSh11MxjG6%2BfhSjJoXT5ZpmVf7NScBmvLNskh22j12ubNlyUDcIlBwUPj8G1FAS8e3MotNdAZ9oln%2BqxeE%2F7K0kuUSdU8kq9N5ZZd8Vx3m9OLi%2BobRZ5acVpT3TvtJMA2DNf9OGvC6y4eTrN9n3YoIMqvu8593mcW5fTIEgH7OjJV6UBoqH2c%2BjiNi1ZZsK9o6KlESd8i4v8C2DF52mBlTIG0tYkXI5KRom9ADo%2Bg%2F%2BGsCAiJPOHedlOBRsro%2BQ3iV6tjbgad2LwF2azWYCQBdmwSk3UJFpeHUc6cUvhMcy0BJ5tKE

and from Web.Host Logs I get DEBUG 2022-11-09 09:16:49,918 [29 ] Abp.AspNetCore.SignalR.Hubs.AbpCommonHub - A client is connected: {"ConnectionId":"OT1w2usalDZHMcb4OoyyCQ","IpAddress":"127.0.0.1","TenantId":1,"UserId":3,"ConnectTime":"2022-11-09T09:16:49.9163277+02:00","Properties":{}}

I send the notification using the below function in AppNotifier when I create a new object

public async Task NewIncidentAsync(Incident incident) { var notificationData = new MessageNotificationData("New " + incident.Criticality.ToString() + " " + incident.Type.ToString() + " incident:" + incident.Description); notificationData["description"] = incident.Description; notificationData["type"] = incident.Type.ToString(); notificationData["critical"] = incident.Criticality.ToString(); notificationData["lat"] = incident.Latitude; notificationData["lon"] = incident.Longitude; notificationData["id"] = incident.Id; await _notificationPublisher.PublishAsync(AppNotificationNames.NewIncident, notificationData,severity: NotificationSeverity.Warn); }

but maybe I do something wrong in message subscription code.

HubConnection.On<string>(AppNotificationNames.NewIncident, (message) => { Console.WriteLine("TEST"); });

Thank you!
0

ismcagdas created 2 years ago
Support Team

Hi,

Thanks, running the app using Mobile profile is also fine. Could you also share your Hub configuration in your Startup.cs file ?
0

mgcode created 2 years ago

Hi,

I have not change anything else about hub configuration. In Web.Host Startup.cs I have the default code. app.UseEndpoints(endpoints => { endpoints.MapHub<AbpCommonHub>("/signalr"); endpoints.MapHub<ChatHub>("/signalr-chat"); ... I may not have understood something correctly about how Notifications work. I have not implemented a separate hub. Do the notifications send a message to the AbpCommonHub signalr hub? If there was a sample or some code on how i can get them in xamarin application that would be great.

Thank you!
0

ismcagdas created one year ago
Support Team

Hi @mgc

Sorry for my late reply. Actaully your approach seems fine. But, could you create a new hub similar to endpoints.MapHub<ChatHub>("/signalr-chat"); and use it in your Xamarin app as well and send the notification using this hub similar to https://github.com/aspnetzero/aspnet-zero-core/blob/dev/aspnet-core/src/MyCompanyName.AbpZeroTemplate.Web.Core/Chat/SignalR/SignalRChatCommunicator.cs#L46 and see if it works ?
0

mgcode created 2 years ago

Hi,

I created a new separate hub with a new signalr communicator similar to SignalRChatCommunicator. I modified the Startup with the new endpoint of the new hub. Also I created a new console application in order to test the code and subscribe to then event of the new hub. I manage to connect to the new hub (I checked the log for the connection id) running Host in Mobile profile but I cannot get the message.

I send a message to all clients of the hub using the code below await _incHub.Clients.All.SendAsync("getIncidentMessage", "test");

The code of the console application is `var hubConnection = new HubConnectionBuilder() .WithUrl("https://localhost:44301/inchub", (opts) => { opts.HttpMessageHandlerFactory = (message) => { if (message is HttpClientHandler clientHandler) // bypass SSL certificate clientHandler.ServerCertificateCustomValidationCallback += (sender, certificate, chain, sslPolicyErrors) => { return true; }; return message; }; } ) .Build();

hubConnection.On("getMessage", message => Console.WriteLine(message)); hubConnection.On("getIncidentMessage", message => Console.WriteLine(message)); hubConnection.On("App.NewIncident", message => Console.WriteLine(message)); hubConnection.StartAsync().Wait();`

Could you please provide a sample code like the code above that works with any message in default hub or chathub of the asp.net zero. If I had the implementation in Xamarin would be perfect.

I cannot find a solution that works.

Thank you one more time for your help.
0

ismcagdas created 2 years ago
Support Team

Hi @mgc

Thanks for the update. We will check it deeply and inform you.

m.aliozkaya created 2 years ago

Support Team

Hi @mgc

I tried to subscribe getChatMessage at signalr-chat hub. I can send and receive messages from Angular to Xamarin app. I hope this code helps to you.

    public async Task&lt;bool&gt; ConnectAsync()
    {
        ChatConnection.On&lt;ChatMessageDto&gt;("getChatMessage", (result) =>
        {
            Console.WriteLine("Helo");
            
        });

        try
        {
            if (ChatConnection.State == HubConnectionState.Connected)
            {
                return true;
            }

            if (_isConnecting)
            {
                return false;
            }

            _isConnecting = true;

            await ChatConnection.StartAsync();

            Console.WriteLine(@"Connected!");

            return true;
        }
        catch (Exception ex)
        {
            ExceptionHandler.LogException(ex);
            return false;
        }
        finally
        {
            _isConnecting = false;
        }
    }

    public async Task&lt;bool&gt; SendMessageAsync(string message)
    {
        if (!await ConnectAsync())
        {
            return false;
        }

        try
        {
            var messageData = new SendChatMessageInput
            {
                TenantId = 1,
                UserId = 2,
                Message = message,
            };

            var response = await ChatConnection.InvokeAsync&lt;string&gt;("SendMessage", messageData);

            if (string.IsNullOrEmpty(response))
            {
                Console.WriteLine(@"Message successfully sent!");
                return true;
            }

            Console.WriteLine(@"Message failed to send: " + response);
            return true;
        }
        catch (Exception ex)
        {
            ExceptionHandler.LogException(ex);
            return false;
        }
    }

0

mgcode created 2 years ago

Hi m.aliozkaya,

Thank you very much for your help and your code.

I used the chathub and your code and I managed to send a message from xamarin to web mvc application and at the same time the On<ChatMessageDto> was called when I sent the message from Xamarin.

But when I send a chat message from the mvc web application then the xamarin application does not receive it. On web mvc application I can send a chat message from one user to another.

Please note that I do not use Angular but MVC.

Any help would be appreciated. Thank you once more!
0

ismcagdas created 2 years ago
Support Team

Hi @mgc

Is your final CreateHubUrl contains enc_auth_token query string parameter with a valid encrpyed token ?

mgcode created 2 years ago

Hi ismcagdas,

Yes, the CreateHubUrl contains the enc_auth_token. Please see the screenshot below from the Host log.

I can send the message successfully from Xamarin to Web app but I cannot receive a message from Web app.

This is my code for the notification service:

public class NotificationService : ISingletonDependency, INotificationService
    {
        public HubConnection _HubConnection { get; }

        private readonly IAccessTokenManager _accessTokenManager;
        private bool _isConnecting;

        public NotificationService(IAccessTokenManager accessTokenManager)
        {
            try
            {
                _accessTokenManager = accessTokenManager;

                _HubConnection = new HubConnectionBuilder()
                    .WithUrl(CreateHubUrl(),

                    (opts) =>
                        {
                            opts.HttpMessageHandlerFactory = (message) =>
                            {
                                if (message is HttpClientHandler clientHandler)
                                    // bypass SSL certificate
                                    clientHandler.ServerCertificateCustomValidationCallback +=
                                        (sender, certificate, chain, sslPolicyErrors) => { return true; };
                                return message;
                            };
                        }
                    )
                    .Build();


                _HubConnection.Closed += TryToConnectIfNeeds;

            }
            catch (Exception ex)
            {
                ExceptionHandler.LogException(ex);
            }
        }

        private async Task TryToConnectIfNeeds(Exception connectionException)
        {
            try
            {
                ExceptionHandler.LogException(connectionException);

                if (!_accessTokenManager.IsUserLoggedIn)
                {
                    return;
                }

                await Task.Delay(new Random().Next(0, 5) * 1000);
                await _HubConnection.StartAsync();
            }
            catch (Exception ex)
            {
                ExceptionHandler.LogException(ex);
            }
        }

        public async Task<bool> SendMessageAsync(string message)
        {
            if (!await ConnectAsync())
            {
                return false;
            }

            try
            {
                //find an existing user, I picked the user with Id:4
                var messageData = new SendChatMessageInput
                {
                    TenantId = 1,
                    TenancyName = "Default",
                    UserId = 2,
                    UserName = "admin",
                    Message = message
                };

                var response = await _HubConnection.InvokeAsync<string>("SendMessage", messageData);
                if (string.IsNullOrEmpty(response))
                {
                    Console.WriteLine(@"Message successfully sent!");
                    return true;
                }

                Console.WriteLine(@"Message failed to send: " + response);
                return true;
            }
            catch (Exception ex)
            {
                ExceptionHandler.LogException(ex);
                return false;
            }
        }



        public async Task<bool> ConnectAsync()
        {
            _HubConnection.On<ChatMessageDto>("getChatMessage", (result) =>
            {
                Console.WriteLine("Helo");

            });

            try
            {
                if (_HubConnection.State == HubConnectionState.Connected)
                {
                    return true;
                }

                if (_isConnecting)
                {
                    return false;
                }

                _isConnecting = true;

                await _HubConnection.StartAsync();

                Console.WriteLine(@"Connected!");
                return true;
            }
            catch (Exception ex)
            {
                ExceptionHandler.LogException(ex);
                return false;
            }
            finally
            {
                _isConnecting = false;
            }
        }


        public async Task<bool> DisconnectAsync()
        {
            try
            {
                if (_HubConnection.State == HubConnectionState.Disconnected)
                {
                    return true;
                }

                await _HubConnection.StopAsync();

                Console.WriteLine(@"Disconnected!");
                return true;
            }
            catch (Exception ex)
            {
                ExceptionHandler.LogException(ex);
                return false;
            }
        }

        private string CreateHubUrl()
        {
            string accessToken = _accessTokenManager.AuthenticateResult.EncryptedAccessToken;
            return ApiUrlConfig.BaseUrl +
                   AppConsts.SignalRChatHubPath.TrimStart('/') + "?" +
                   AppConsts.EncryptedAuthTokenQueryStringName + "=" +
                   Uri.EscapeDataString(accessToken);
        }
    }

Then inside a view model using a button I call the SendMessageAsync. I might be doing something wrong in how I call and what I call in the class NotificationService above.

Thank you very much for your help!

0

ismcagdas created 2 years ago
Support Team

Hi @mgc

I think this happens because the default MVC template doesn't handle enc_auth_token query string parameter. Could you add this line to your MVC AuthConfigurer class https://github.com/aspnetzero/aspnet-zero-core/blob/dev/aspnet-core/src/MyCompanyName.AbpZeroTemplate.Web.Host/Startup/AuthConfigurer.cs#L57 and also implement QueryStringTokenResolver in your MVC app ?
0

mgcode created 2 years ago

Hi ismcagdas,

The above code exists in the Host AuthConfigurer class.

Could you please have a look at the code in the project I am sharing with you in the link below?

https://mgcodegr.sharepoint.com/:u:/g/Ea22k-KFFlVNvWuhI6EnKk8BalPc2UlLMpV1XzjOlS3p_w?e=JpqahC

I have created in the mobile shared the service NotificationService and in the IncidentsViewModel I call the SendMessage which successfully sends the message and the web app receives it but I am not able to receive a message when I send it from the web app.

Thank you very much for your time and your help!
0

m.aliozkaya created 2 years ago
Support Team

Hi @mgc ,

We are working on it, we will try to give an answer as soon as possible

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