Chi yra lengvas HTTP routeris. Pridedame:

go get github.com/go-chi/chi/v5

func main() {
    r := chi.NewRouter()
    r.Use(middleware.Logger)
    r.Use(handlers.LanguageMiddleware)
    r.Get("/", handlers.HandleHome(queries))
    r.Get("/stacks/{slug}", handlers.HandleStack(queries))
    r.Get("/lessons/{slug}", handlers.HandleLesson(queries))
    http.ListenAndServe(":8090", r)
}

{slug} nuskaitomas su chi.URLParam(r, "slug").

Kiekvienas handleris naudoja closure pattern.

func HandleHome(queries *internaldb.Queries) http.HandlerFunc {
    return func(w http.ResponseWriter, r *http.Request) {
        lang := GetLang(r)
        t := i18n.Get(lang)
        stacks, err := queries.GetAllStacks(r.Context())
        if err != nil {
            http.Error(w, "server error", 500)
            return
        }
        templates.HomePage(t, lang, stacks).Render(r.Context(), w)
    }
}

• Vengiame globalių kintamųjų
• Lengva testuoti
• Aiškios priklausomybės

Middleware vykdomas prieš kiekvieną request.

func LanguageMiddleware(next http.Handler) http.Handler {
    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
        lang := "lt"
        if cookie, err := r.Cookie("lang"); err == nil {
            if cookie.Value == "en" || cookie.Value == "lt" {
                lang = cookie.Value
            }
        }
        ctx := context.WithValue(r.Context(), LangKey, lang)
        next.ServeHTTP(w, r.WithContext(ctx))
    })
}

Bet kuriame handleryje:

lang := GetLang(r)