Notim.Outputs

This is a Basic Wrapper for use case Outputs, commom used with Mediatr Output or CQRS Patterns

you can use in your project by nuget.org

you can install with nuget package manager

dotnet add package Notim.Outputs --version 3.0.0

Simple Usage

the usage is very simple, you only need to instace Output with classe that you need to transport.

var output = new Output<ClassThatYouNeedToTransport>();

if (something is not Good) {
  output.AddFaultMessage("something is not good");
}
else{
  output.AddMessage("Success");
  output.AddResult(new ClassThatYouNeedToTransport(argsThenYouNeed));
}

return output;

Faults treatment by Fault type

you have the functionality to determine the Fault type to filter if you want to return a especific status code or retries on your topic consumers

var output = new Output<ClassThatYouNeedToTransport>();

if (something is not Good && externalServiceIsOffline)
{
  output.AddFault(new Fault(FaultType.ExternalServiceUnavailable, "customer service is down"));
}
else if (something is not Good && cannotFindResultOnDatabase)
{
  output.AddFault(new Fault(FaultType.ResourceNotFound, "the user with id xxx cannot be find"));
}
else if (something is not Good && invalidInputReceived)
{
  output.AddFault(new Fault(FaultType.InvalidInput, "invalid fields"));
}
else
{
  output.AddMessage("Success");
  output.AddResult(new ClassThatYouNeedToTransport(argsThenYouNeed));
}

return output;

Asp .Net WebApi Controller using "use case" pattern example:

[HttpGet("/")]
public async Task<IActionResult> GetOrder(ClassThatYouReceiveDataInput input, CancelationToken cancelationToken)

    Output<ClassThatYouNeedToTransport> output = await _findUserByIdUseCase.Handle(input, cancelationToken);
    
    if (!output.IsValid && output.Fault?.FaultType  is FaultType.ExternalServiceUnavailable)
        return BadGateway(output.Fault);
    
    if (!output.IsValid && output.Fault?.FaultType is FaultType.ResourceNotFound)
        return NotFound(output.Fault);
    
    if (!output.IsValid && output.Fault?.FaultType is FaultType.InvalidInput)
        return UnprocessableEntity(output.Fault);
    
    if (!output.IsValid && output.Fault?.FaultType is FaultType.InvalidOperation)
        return UnprocessableEntity(output.Fault);
    
    return Ok(output.GetResult());
}

Single Line Fluent Form to build Output

After version 2 you can use the single line Build Form to create Output

success use case output

var output = Output<ClassThatYouNeedToTransport>.WithSuccess("use case finished with success", new ClassThatYouNeedToTransport());

Fault use case output

var output = Output<ClassThatYouNeedToTransport>.WithFault("An Fault was ocurred");

Fault object use case output

var output = Output<ClassThatYouNeedToTransport>.WithFault(new Fault(FaultType.ExternalServiceUnavailable, "external service is unavaiable"));

Empty body can be returned

After version 3 you can use the Output with empty body to create Output

var output = Output();
output.AddFault("simple error");

var output = Output();
output.AddFault(new Fault(ErrorType.ExternalServiceUnavailable), "external error");

Notim.Outputs.FluentValidation

you can use FluentValidation library "ValidationResult" to create an Output with FaultType.InvalidInput, you just only need to install the extension package:

nuget.org

you can install Notim.Outputs.FluentValidation with nuget package manager, run the command below:

dotnet add package Notim.Outputs.FluentValidation --version 3.0.0

simple usage

The usage is very simple:

IValidator<SomeClass> validator = new SomeClassValidator<SomeClass>();

var validationResult = validator.Validate(someObject);

var output = new Output<SomeClassThatUseToTransport>();

output.AddValidationResult(validationResult);

Contribution

If you would like to contribute to this project, follow these steps:

2. Create a branch for your changes (git checkout -b feature/MyFeature)
3. Commit your changes (git commit -am 'feat: add a feature')
4. Push to the branch (git push origin feature/MyFeature)
5. Open a Pull Request

some issues you can talk with me paulino.joaovitor@yahoo.com.br