How can i get access to the error returned by the handler using a middleware?

[barata0]

Let´s suppose I want to log every error returned by the handlers
I believe the best way to do this is using a middleware and if there is an error log it.

Best I could think about is this:

		log.Printf("Error: %v", ctx.Context().Err())
	}

But ctx.Context.Err is nil.

[danielgtaylor]

@barata0 it depends on what you want to log exactly. I would suggest either a middleware or a transformer:

• Log HTTP status code, headers, response body, etc via a middleware. You can wrap http.ResponseWriter or huma.Context to store the status/headers/body and then read it after the operation completes.
• Get the error instance via a transformer before it is serialized to HTTP. You will have to check if the value is an error instance.

Another possibility is to use your own register function, something like:

func MyRegister[I, O any](api huma.API, op huma.Operation, handler func(context.Context, *I) (*O, error)) {
	huma.Register(api, op, func(ctx context.Context, input *I) (*O, error) {
		result, err := handler(ctx, input)
		if err != nil {
			// Do something here!
		}
		return result, err
	})
}