Issue with SignalR implementation in our project #11840

WTPL created one year ago

We're utilizing .NET Core 8 in conjunction with jQuery implementation. However, there's an issue where the SignalR hub does not initiate an event when I make a request or access the API endpoint. Please advise on this `SignalR hub not triggering an event when i hit or called endpoint Api ..

Step 1 -- > Created one EventHub (Assembly is --> Wauly.Web.core/Chat/SignalR/EventHub)

using System; using System.Threading.Tasks; using Abp.AspNetCore.SignalR.Hubs; using Abp.Localization; using Abp.RealTime; using Abp.Runtime.Session; using Castle.Core.Logging; using Castle.Windsor; using Microsoft.AspNetCore.SignalR; using wauly.Chat;

namespace wauly.Web.Chat.SignalR { public class EventHub : OnlineClientHubBase { private readonly IChatMessageManager _chatMessageManager; private readonly ILocalizationManager _localizationManager; private readonly IWindsorContainer _windsorContainer; private bool _isCallByRelease; public IAbpSession AbpSession { get; set; }

	public Castle.Core.Logging.ILogger Logger { get; set; }

	public EventHub(
	   IChatMessageManager chatMessageManager,
	   ILocalizationManager localizationManager,
	   IWindsorContainer windsorContainer,
	   IOnlineClientManager<ChatChannel> onlineClientManager,
	   IOnlineClientInfoProvider clientInfoProvider) : base(onlineClientManager, clientInfoProvider)
	{
		_chatMessageManager = chatMessageManager;
		_localizationManager = localizationManager;
		_windsorContainer = windsorContainer;

		Logger = NullLogger.Instance;
		AbpSession = NullAbpSession.Instance;
	}

	public async Task SendMessage(string message)
	{
		await Clients.All.SendAsync("getMessage", string.Format("User {0}: {1}", AbpSession.UserId, message));
	}

	public override async Task OnConnectedAsync()
	{
		await base.OnConnectedAsync();
		Logger.Debug("A client connected to MyChatHub: " + Context.ConnectionId);
	}

	public override async Task OnDisconnectedAsync(Exception exception)
	{
		await base.OnDisconnectedAsync(exception);
		Logger.Debug("A client disconnected from MyChatHub: " + Context.ConnectionId);
	}
}

}

step 2 --> Registered My hub into StartUp file with the existing Hubs.. (Assembly is --> Wauly.Web.Host/Startup/Startup)

app.UseEndpoints(endpoints =>
        {
            endpoints.MapHub<AbpCommonHub>("/signalr");
            endpoints.MapHub<ChatHub>("/signalr-chat");
            endpoints.MapHub<EventHub>("/signalr-eventHub");

			endpoints.MapControllerRoute("defaultWithArea", "{area}/{controller=Home}/{action=Index}/{id?}");
            endpoints.MapControllerRoute("default", "{controller=Home}/{action=Index}/{id?}");

            app.ApplicationServices.GetRequiredService<IAbpAspNetCoreConfiguration>().EndpointConfiguration
                .ConfigureAllEndpoints(endpoints);
        });

Step 3 --> Created one service for the API Endpoint (Assembly is --> Wauly.Application/Chat/EventHubAppService)

using System.Threading.Tasks; using Abp.Authorization; using Abp.Domain.Repositories; using Abp.RealTime; using Abp.Runtime.Session; using wauly.Friendships.Cache;

namespace wauly.Chat { [AbpAuthorize] public class EventHubAppService : waulyAppServiceBase, IEventService { private readonly IRepository<ChatMessage, long> _chatMessageRepository; private readonly IUserFriendsCache _userFriendsCache; private readonly IOnlineClientManager

	public EventHubAppService(
		IRepository<ChatMessage, long> chatMessageRepository,
		IUserFriendsCache userFriendsCache,
		IOnlineClientManager<ChatChannel> onlineClientManager,
		IEventCommunicator eventCommunicator)
	{
		_chatMessageRepository = chatMessageRepository;
		_userFriendsCache = userFriendsCache;
		_onlineClientManager = onlineClientManager;
		_eventCommunicator = eventCommunicator;
	}
	public async Task DeviceActivation(long userId,int? tenantId)
	{
		var userIdentifier = AbpSession.ToUserIdentifier();

		var onlineUserClients = await _onlineClientManager.GetAllByUserIdAsync(userIdentifier);
		await _eventCommunicator.DeviceActivation(onlineUserClients, userIdentifier);
	}
}

}

Step 4 --> Created Event Communicator Interface and register there my service (Assembly is --> Wauly.core/Chat/IEventCommunicator)

using System.Collections.Generic; using System.Threading.Tasks; using Abp; using Abp.RealTime;

namespace wauly.Chat { public interface IEventCommunicator { Task DeviceActivation(IReadOnlyList

step 5 -- > After that created Event Communicator and use the DeviceActivation here (Assembly is --> Wauly.Web.core/Chat/SignalR/SignalREventHubCommunicator)

using System.Collections.Generic; using System.Threading.Tasks; using Abp; using Abp.Dependency; using Abp.ObjectMapping; using Abp.RealTime; using Castle.Core.Logging; using Microsoft.AspNetCore.SignalR; using wauly.Chat;

namespace wauly.Web.Chat.SignalR { public class SignalREventHubCommunicator : IEventCommunicator, ITransientDependency { public ILogger Logger { get; set; }

	private readonly IObjectMapper _objectMapper;

	private readonly IHubContext<EventHub> _eventHub;

	public SignalREventHubCommunicator(
		IObjectMapper objectMapper,
		IHubContext<EventHub> eventHub)
	{
		_objectMapper = objectMapper;
		_eventHub = eventHub;
		Logger = NullLogger.Instance;
	}
	public async Task DeviceActivation(IReadOnlyList<IOnlineClient> onlineFriendClients, UserIdentifier user)
	{
		await _eventHub.Clients.All.SendAsync("EventHubActivity","HelloFromApi");
	}
}

}

step 6 --> For the acivation of my eventHub i have writed down acivation logic in index file of device management and also have write other events which are not triggering .. (Assembly is --> Wauly.Web.MVC/WWWroot/View-Resources/Areas/Views/Devices/Index.js)

abp.signalr.startConnection(abp.appPath + 'signalr-eventHub', function (connection) { chatHub = connection; // Save a reference to the hub connection.on('DeviceActivationResponse', function (responseMessage) { console.log('received DeviceActivationResponse: ' + responseMessage);

            // Handle the response here, update UI, etc.
        });
        connection.on('getMessage', function (message) { // Register for incoming messages
            console.log('received message: ' + message);

        });
        connection.on('EventHubActivity', function (message, message1) { // Register for incoming messages
            dataTable.ajax.reload();
            console.log('received message: ' + message + message1);
        });
    }).then(function (connection) {
        abp.log.debug('Connected to EventHub server!');
        abp.event.trigger('myChatHub.connected');


    });

    abp.event.on('myChatHub.connected', function () { // Register for connect event
        chatHub.invoke('sendMessage', "Hi everybody, I'm connected to the Event Hub!"); // Send a message to the server
    });

    // Register for 'EventHubActivity' event
    abp.event.on('EventHubActivity', function (message, message1) {
        console.log('received EventHubActivity message: ' + message + message1);
    });

7 Answer(s)

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