RadEndpoints

An API library bringing REPR-style endpoint classes to .NET Minimal API.

Library Goals

Should be:

• Lightweight -- and easy to work with or without.
• Junior Developer Friendly -- without impeding more experienced engineers.
• Backward Compatible -- with Minimal API configuration and features.
• Configurable -- using MinimalApi RouteHandlerBuilder.
• Well Structured -- for common tasks such as validation, mapping and error handling.
• Extensible -- to allow for custom alternate endpoint implmentations.
• Fast and Easy -- to rapidly scaffold projects, endpoints and tests.
• Low Maintenance -- for testing.

Features:

REPR Endpoint Classes

• Reduced configuration noise over minimal api endpoints
• Constructor dependency injection
• Scoped lifetime
• Assembly scanned and configured request validator and model mapper
• Built-in Endpoint Class Conveniences
  • HttpContext
  • Logger
  • Environment Info
  • Response Object
  • Model Mapper
  • TypedResult Shortcuts

public class GetSampleEndpoint(ISampleService sampleService) : RadEndpoint<GetSampleRequest, GetSampleResponse, GetSampleMapper>
{
    public override void Configure()
    {
        Get("/samples/{id}")
            .Produces<GetSampleResponse>(StatusCodes.Status200OK)            
            .ProducesProblem(StatusCodes.Status404NotFound)
            .ProducesValidationProblem()
            .WithDocument(tag: "Sample", desc: "Get Sample by ID");

            //Any NET minimal api (RouteHandlerBuilder) configuration works here.
    }

    public override async Task Handle(GetSampleRequest r, CancellationToken ct)
    {
        var sample = await sampleService.GetSampleById(r.Id, ct);

        if(sample is null)
        {
            SendNotFound("Sample not found.");
            return;
        }
        Response = Map.FromEntity(sample);
        Send();
    }
}

Request Model Binding and Validation

• Automatic request model binding from route, query, header, and body using [AsParameters].
• Automatic request model validation execution using FluentValidation

public class GetSampleRequest
{
    [FromRoute]
    public int Id { get; set; }
}

public class GetSampleRequestValidator : AbstractValidator<GetSampleRequest>
{
    public GetSampleRequestValidator()
    {
        RuleFor(e => e.Id).GreaterThan(0);
    }
}

public class GetSampleResponse
{
    public SampleDto Data { get; set; } = null!;
    public string Message { get; set; } = "Sample retrieved successfully";
}

Endpoint Model Mapper

• Assign mappers for conventient access from endpoint
• Makes mapping a first class citizen with the endpoint configuration
• Map manually or with a mapping tool like AutoMapper or Mapster

public class GetExampleMapper : IRadMapper<GetExampleRequest, GetExampleResponse, Example>
{
    public GetExampleResponse FromEntity(Example e) => new()
    {
        Data = new()
        {
            Id = e.Id,
            FirstName = e.FirstName,
            LastName = e.LastName
        }
    };
    public Example ToEntity(GetExampleRequest r) => throw new NotImplementedException();
}

Flexibility and Alternate Base Endpoint Class

• Don't like the endpoint base classes? Make your own using the included abstractions.
• Want to use a bare minimum REPR endpoint with Open Union Types? Go for it.
• Need to create a super specialized edge case endpoint with pure minimal api endpoint? No problem.

  //Code samples coming soon

Integration Testing

• Strongly typed "Routeless" HttpClient extensions
• Reduced maintenance with automatic endpoint route discovery and request model binding
• Easy to navigate to endpoint code from test
• Consistent and convenient response assertions for HttpResponse and ProblemDetails using FluentAssertions
• Detailed exception messages so you dig less to find test issues.

[Fact]
public async void When_RequestValid_ReturnsSuccess()
{
    //Arrange
    var request = new GetSampleRequest { Id = 1 };

    //Act       
    var r = await f.Client.GetAsync<GetSampleEndpoint, GetSampleRequest, GetSampleResponse>(request);

    //Assert
    r.Should()
        .BeSuccessful<GetSampleResponse>()
        .WithStatusCode(HttpStatusCode.OK);
}

CLI For Scaffolding

• Scaffold multiple new endpoints very quickly.
• Import a set of endoints using a JSON definition.
• Full parameter support for 1 line endpoint creation.

Endpoint Wizard

JSON definition

[
  {
    "BaseNamepace": "Demo.Api.Endpoints",
    "ResourceName": "User",
    "Verb": "Get",
    "EndpointName": "GetUser",
    "Path": "/users/{id}",
    "Entity": "User",
    "Tag": "User",
    "Description": "Get User by ID",
    "WithMapper": true
  },
  {
    "BaseNamepace": "Demo.Api.Endpoints",
    "ResourceName": "User",
    "Verb": "Post",
    "EndpointName": "CreateUser",
    "Path": "/users",
    "Entity": "User",
    "Tag": "User",
    "Description": "Create a new User",
    "WithMapper": true
  }
  ...other endpoints.
]

Bulk JSON Import

Coming Soon:

• Project templates
• Observability Tooling
• Additional code coverage
• Documentation / How Tos

Credits

• FastEndpoints -- as many of the ideas from that project inspired this one.