func()

in online_boutique_demo/src/frontend/handlers.go [149:211]
57 lines of code
8 McCabe index (conditional complexity)

func (fe *frontendServer) productHandler(w http.ResponseWriter, r *http.Request) {
	log := r.Context().Value(ctxKeyLog{}).(logrus.FieldLogger)
	id := mux.Vars(r)["id"]
	if id == "" {
		renderHTTPError(log, r, w, errors.New("product id not specified"), http.StatusBadRequest)
		return
	}
	log.WithField("id", id).WithField("currency", currentCurrency(r)).
		Debug("serving product page")

	fmt.Printf("product: %p\n", r.Context())
	p, err := fe.getProduct(r.Context(), id)
	if err != nil {
		renderHTTPError(log, r, w, errors.Wrap(err, "could not retrieve product"), http.StatusInternalServerError)
		return
	}
	currencies, err := fe.getCurrencies(r.Context())
	if err != nil {
		renderHTTPError(log, r, w, errors.Wrap(err, "could not retrieve currencies"), http.StatusInternalServerError)
		return
	}

	cart, err := fe.getCart(r.Context(), sessionID(r))
	if err != nil {
		renderHTTPError(log, r, w, errors.Wrap(err, "could not retrieve cart"), http.StatusInternalServerError)
		return
	}

	price, err := fe.convertCurrency(r.Context(), p.GetPriceUsd(), currentCurrency(r))
	if err != nil {
		renderHTTPError(log, r, w, errors.Wrap(err, "failed to convert currency"), http.StatusInternalServerError)
		return
	}

	recommendations, err := fe.getRecommendations(r.Context(), sessionID(r), []string{id})
	if err != nil {
		renderHTTPError(log, r, w, errors.Wrap(err, "failed to get product recommendations"), http.StatusInternalServerError)
		return
	}

	product := struct {
		Item  *pb.Product
		Price *pb.Money
	}{p, price}

	if err := templates.ExecuteTemplate(w, "product", map[string]interface{}{
		"session_id":        sessionID(r),
		"request_id":        r.Context().Value(ctxKeyRequestID{}),
		"ad":                fe.chooseAd(r.Context(), p.Categories, log),
		"user_currency":     currentCurrency(r),
		"show_currency":     true,
		"currencies":        currencies,
		"product":           product,
		"recommendations":   recommendations,
		"cart_size":         cartSize(cart),
		"platform_css":      plat.css,
		"platform_name":     plat.provider,
		"is_cymbal_brand":   isCymbalBrand,
		"deploymentDetails": deploymentDetailsMap,
	}); err != nil {
		log.Println(err)
	}
}