Error Handler

Introduced in v0.6.0.

While using httpin.NewInput to create an HTTP middleware handler, an error handler will be used to handle cases of decoding failures. You can sepcify a custom error handler for httpin to use. Which should adhere to the following signature:

func CustomErrorHandler(rw http.ResponseWriter, r *http.Request, err error) {
    // ...
}

The WithErrorHandler Option

Using with an HTTP middleware handler:

router := chi.NewRouter()

func init() {
    router.With(
        httpin.NewInput(ListThingsInput{}, WithErrorHandler(CustomErrorHandler)),
    ).Get("/things/:id", ListThings)
}

Using with a core:

co, err := httpin.New(Thing{}, WithErrorHandler(CustomErrorHandler))
input, err := co.Decode(req)

Global Error Handler

If you are using httpin.NewInput to create middlewares, you will find that it's annoying to add an option to each call in order to use a custom error handler.

Replace the default error handler globally:

import httpin_core "github.com/ggicci/httpin/core"

func myCustomErrorHandler(rw http.ResponseWriter, r *http.Request, err error) {
    // ...
}

func init() {
    httpin_core.RegisterErrorHandler(myCustomErrorHandler)
}