All requests to our handler need to be logged. This is where
middlewares come in handly. Middlewares are simply put a routine
that does something before or after (or both), another handler.
func NewRouter() (router *mux.Router) {
router = mux.NewRouter()
- router.Handle("/books", &books{}).Methods("GET")
+ router.Handle("/books", logIncoming(&books{})).Methods("GET")
return
}
+func logIncoming(next http.Handler) http.HandlerFunc {
+ log := log.New(os.Stderr, "", log.LstdFlags)
+ return func(w http.ResponseWriter, r *http.Request) {
+ log.Printf("%s %s", r.Method, r.URL.Path)
+ next.ServeHTTP(w, r)
+ }
+}
+
type books struct{}
func (h *books) ServeHTTP(w http.ResponseWriter, r *http.Request) {
