chirp

Request parser for chi router

go get -u github.com/vporoshok/chirp

Usage

There are two way to use this library. Parse as function or as middleware. Supported tags are path for chi router path parts, query for query parameters and json for body regardless of type (json / form). For json used standard encoding/json, for other parts it is trying to cast encoding.TextUnmarshaler and use it on success, otherwise used fmt.Sscan.

Parse

router := chi.NewRouter()
router.Put("/user/{id}/name", func(w http.ResponseWriter, r *http.Request) {
    var data struct {
        ID       uuid.UUID `path:"id"`
        Name     string    `json:"name"`
        Part     string    `query:"part"`
        Priority uint8     `json:"priority"`
        Null     string    `json:"-"`
        Hero     string
    }
    if err := chirp.Parse(r, &data); err != nil {
        http.Error(w, err.Error(), http.StatusBadRequest)
        return
    }
    // work with data
})

Middleware

Middleware need a struct instance, not point to struct!

router := chi.NewRouter()
type Data struct {
    ID       uuid.UUID `path:"id"`
    Name     string    `json:"name"`
    Part     string    `query:"part"`
    Priority uint8     `json:"priority"`
    Null     string    `json:"-"`
    Hero     string
}
router.With(
    chirp.Middleware(Data{}, chirp.WithInterrupt(400)),
).Put("/user/{id}/name", func(w http.ResponseWriter, r *http.Request) {
    data := chirp.RequestFromContext(r.Context()).(Data)
    // use data
})

Be aware to use middleware only on part of route which contained all needed parts. For example, next code is wrong:

router := chi.NewRouter()
type Data struct {
    ID       uuid.UUID `path:"id"`
    Name     string    `json:"name"`
    Part     string    `query:"part"`
    Priority uint8     `json:"priority"`
    Null     string    `json:"-"`
    Hero     string
}
router.Use(chirp.Middleware(Data{}, chirp.WithInterrupt(400)))
router.Put("/user/{id}/name", func(w http.ResponseWriter, r *http.Request) {
    data := chirp.RequestFromContext(r.Context()).(Data)
    // data.ID always be empty
})