Reprise 1.0.1

Reprise

Reprise is a micro-framework that brings the REPR (Request-Endpoint-Response) pattern and vertical slice architecture into ASP.NET Core Minimal APIs.

Getting Started

1. Create a new ASP.NET Core empty project.

2. Install the Reprise NuGet package.

3. Modify your Program.cs to use Reprise.

var builder = WebApplication.CreateBuilder(args);
builder.ConfigureServices();
var app = builder.Build();
app.MapEndpoints();
app.Run();

4. Create an endpoint Endpoints/GetHelloEndpoint.cs.

[Endpoint]
public class GetHelloEndpoint
{
    [Get("/")]
    public static string Handle() => "Hello, world!";
}

5. Run the application.

Endpoints

An endpoint is a public class that is decorated with the EndpointAttribute. It should contain a public static Handle method which should be decorated with one of the HTTP method and route attributes. These are:

• GetAttribute
• PostAttribute
• PutAttribute
• PatchAttribute
• DeleteAttribute
• MapAttribute - for other/multiple HTTP methods

The Handle method can be synchronous as well as asynchronous and can have any signature and any return type.

[Endpoint]
public class UpdateUserEndpoint
{
    [Authorize]
    [Put("/users/{id}")]
    public static IResult Handle(int id, UserDto userDto, DataContext context)
    {
        // ...
    }
}

In the example id comes from the route, userDto - from the body, and context - from the DI container. Check the Minimal APIs documentation for more information on the topic.

On application startup, app.MapEndpoints() and app.MapEndpoints(assembly) perform an assebly scan and map all endpoints. Reprise will throw an InvalidOperationExcaption when:

• An endpoint has no Handle method
• An endpoint has multiple Handle methods
• The Handle method has no HTTP method and route attribute
• The Handle method has an empty route
• The Handle method has an empty HTTP method
• A HTTP method and route combination is handled by more than one endpoint

Services

Any class that has a public parameterless constructor and implements IServiceConfgurator can configure services.

[Endpoint]
public class GetWeather : IServiceConfigurator
{
    public void ConfigureServices(WebApplicationBuilder builder)
    {
        builder.Services.AddWeatherService();
    }

    [Get("/weather")]
    public static async Task<WeatherForecast[]> Handle(IWeatherService weatherService)
    {
        return await weatherService.GetForecast();
    }
}

On application startup, builder.ConfigureServices() and builder.ConfigureServices(assembly) perform an assebly scan and invoke all ConfigureServices(WebApplicationBuilder builder) implementations. Reprise will throw an InvalidOperationException if a service configurator has no public paramereterless constructor.

OpenAPI

In order to group endpoints in the Swagger UI, Reprise extracts a tag from the route of every endpoint. The first segment that is not "api" (case insensitive) or a parameter is capitalized and set as a tag. "/" is used when no match is found.

Performance

Besides the assembly scans at application startup when configuring services and mapping endpoints, Reprise doesn't add any performance overhead when handling requests.

Support

If you spot any problems and/or have improvement ideas, please share them via the issue tracker.