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SignalR project with .Net Core and Vue

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Goal

Real-time messaging app with signalR.

Quick Start

  1. Clone this repo.

  2. Open a terminal and navigate to the client folder. Restore the dependencies with npm install, then run npm run serve. It will automatically reload when the client code changes.

  3. Open a second terminal and navigate to the server folder. Restore the dependencies with dotnet restore, then run the server with dotnet run. Alternatively use dotnet watch run if you want to automatically reload when the server code changes.

  4. The frontend will be listening on http://localhost:8080 while the backend will be listening at http://localhost:5200

What is signalR ?

SignalR is an open source .NET library written for developing real-time applications.With SignalR, a continuous connection is maintained between client and server. Instead of Request-Response, it calls the client-side Javascript on the server side in our browser with the RPC (Remote Procedure Calls) feature in SignalR. When there is a change in data, the Server calls a Javascript method and notifies the Client or Clients about it. But if HTTP protocol existed, we would have to refresh the page to make this update.

Areas where it is used

  • Social Media / Messaging Applications

  • Real-Time Monitoring Applications

What is a hub ?

Hub connection is a high-level API that allows us to directly call client and server methods written on the Persistence connection. It also provides methods with parameters and model binding.

Configuration

Startup.cs

services.AddSignalR();
app.UseRouting();
app.UseEndpoints(endpoints =>
{
    endpoints.MapHub<ChatHub>("/chathub");
});

Program.cs

public class Program
    {
        public static void Main(string[] args)
        {
            CreateWebHostBuilder(args).Build().Run();
        }

        public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
            WebHost.CreateDefaultBuilder(args)
                .UseStartup<Startup>()
                .UseUrls("http://localhost:5200");
    }

SignalR Mehods

All: All users who log in with this command are shown in real time.

AllExcept: Shows changes triggered by all users except ourselves. When called as Clients.AllExpect (id), all the changes made to all users except the given Id are shown in real time.

Caller: When the current connection ID (logged in ID) makes a change, it shows the changes. Caller function can be given a specific user id called with Caller (id).

Group: Within a group, changes are triggered, except for the group name and our own connection ID.