Cocoar.SignalARRR.SourceGenerator 4.0.0-beta.2

SignalARRR

Typed bidirectional RPC over ASP.NET Core SignalR.

Both server and client can call each other's methods through shared interfaces, with compile-time proxy generation, streaming, cancellation propagation, and ASP.NET Core authorization.

Features

• Typed bidirectional RPC — server calls client methods, client calls server methods, both through shared interfaces
• Compile-time proxy generation — Roslyn source generator produces proxies from [SignalARRRContract] interfaces (zero reflection)
• Organized hub methods — split hub logic across multiple ServerMethods<T> classes with full DI support
• Streaming — IAsyncEnumerable<T>, IObservable<T>, and ChannelReader<T> in both directions
• CancellationToken propagation — server can cancel client operations remotely
• Authorization — method-level, class-level, and hub-level [Authorize] with automatic inheritance
• Server-to-client calls from anywhere — inject ClientManager in controllers, background services, etc.
• Optional runtime proxy fallback — DispatchProxy-based package for plugin/dynamic scenarios

Packages

Quick Start

1. Define shared interfaces

In your shared project, reference Cocoar.SignalARRR.Contracts:

[SignalARRRContract]
public interface IChatHub {
    Task SendMessage(string user, string message);
    Task<List<string>> GetHistory();
    IAsyncEnumerable<string> StreamMessages(CancellationToken ct);
}

[SignalARRRContract]
public interface IChatClient {
    void ReceiveMessage(string user, string message);
    Task<string> GetClientName();
}

2. Server setup

// Program.cs
builder.Services.AddSignalR();
builder.Services.AddSignalARRR(options => options
    .AddServerMethodsFrom(typeof(Program).Assembly));

app.UseRouting();
app.MapHARRRController<ChatHub>("/chathub");

// Hub (can be empty — methods go in ServerMethods classes)
public class ChatHub : HARRR {
    public ChatHub(IServiceProvider sp) : base(sp) { }
}

// Server methods (auto-discovered, DI works)
public class ChatMethods : ServerMethods<ChatHub>, IChatHub {
    public Task SendMessage(string user, string message) { ... }
    public Task<List<string>> GetHistory() { ... }
    public async IAsyncEnumerable<string> StreamMessages(
        [EnumeratorCancellation] CancellationToken ct) {
        while (!ct.IsCancellationRequested) {
            yield return $"msg-{DateTime.Now:ss}";
            await Task.Delay(1000, ct);
        }
    }
}

3. Client setup

var connection = HARRRConnection.Create(builder => {
    builder.WithUrl("https://localhost:5001/chathub");
});
await connection.StartAsync();

// Typed calls
var chat = connection.GetTypedMethods<IChatHub>();
await chat.SendMessage("Alice", "Hello!");
var history = await chat.GetHistory();

// Streaming
await foreach (var msg in chat.StreamMessages(cancellationToken)) {
    Console.WriteLine(msg);
}

4. Server-to-client calls

// Inside ServerMethods — use ClientContext
var client = ClientContext.GetTypedMethods<IChatClient>();
var name = await client.GetClientName();

// Outside hub context — inject ClientManager
public class NotificationService {
    private readonly ClientManager _clients;
    public NotificationService(ClientManager clients) => _clients = clients;

    public void Notify(string connectionId) {
        var client = _clients.GetTypedMethods<IChatClient>(connectionId);
        client.ReceiveMessage("System", "Hello from server!");
    }
}

Framework Support

• Server: .NET 10
• Client: .NET 10

Building from Source

dotnet build src/Cocoar.SignalARRR.slnx
dotnet test src/Cocoar.SignalARRR.slnx

License

MIT License — see LICENSE for details.

Contributing

See CONTRIBUTING.md for guidelines.

Maintainer: Bernhard Windisch