func()

in src/frontend/handlers.go [251:318]

• 62 lines of code
• 9 McCabe index (conditional complexity)

func (fe *frontendServer) viewCartHandler(w http.ResponseWriter, r *http.Request) {
	log := r.Context().Value(ctxKeyLog{}).(logrus.FieldLogger)
	log.Debug("view user cart")
	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
	}

	// ignores the error retrieving recommendations since it is not critical
	recommendations, err := fe.getRecommendations(r.Context(), sessionID(r), cartIDs(cart))
	if err != nil {
		log.WithField("error", err).Warn("failed to get product recommendations")
	}

	shippingCost, err := fe.getShippingQuote(r.Context(), cart, currentCurrency(r))
	if err != nil {
		renderHTTPError(log, r, w, errors.Wrap(err, "failed to get shipping quote"), http.StatusInternalServerError)
		return
	}

	type cartItemView struct {
		Item     *pb.Product
		Quantity int32
		Price    *pb.Money
	}
	items := make([]cartItemView, len(cart))
	totalPrice := pb.Money{CurrencyCode: currentCurrency(r)}
	for i, item := range cart {
		p, err := fe.getProduct(r.Context(), item.GetProductId())
		if err != nil {
			renderHTTPError(log, r, w, errors.Wrapf(err, "could not retrieve product #%s", item.GetProductId()), http.StatusInternalServerError)
			return
		}
		price, err := fe.convertCurrency(r.Context(), p.GetPriceUsd(), currentCurrency(r))
		if err != nil {
			renderHTTPError(log, r, w, errors.Wrapf(err, "could not convert currency for product #%s", item.GetProductId()), http.StatusInternalServerError)
			return
		}

		multPrice := money.MultiplySlow(*price, uint32(item.GetQuantity()))
		items[i] = cartItemView{
			Item:     p,
			Quantity: item.GetQuantity(),
			Price:    &multPrice}
		totalPrice = money.Must(money.Sum(totalPrice, multPrice))
	}
	totalPrice = money.Must(money.Sum(totalPrice, *shippingCost))
	year := time.Now().Year()

	if err := templates.ExecuteTemplate(w, "cart", injectCommonTemplateData(r, map[string]interface{}{
		"currencies":       currencies,
		"recommendations":  recommendations,
		"cart_size":        cartSize(cart),
		"shipping_cost":    shippingCost,
		"show_currency":    true,
		"total_cost":       totalPrice,
		"items":            items,
		"expiration_years": []int{year, year + 1, year + 2, year + 3, year + 4},
	})); err != nil {
		log.Println(err)
	}
}