func()

in online_boutique_demo/src/frontend/handlers.go [57:125]

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

func (fe *frontendServer) homeHandler(w http.ResponseWriter, r *http.Request) {
	log := r.Context().Value(ctxKeyLog{}).(logrus.FieldLogger)
	log.WithField("currency", currentCurrency(r)).Info("home")
	currencies, err := fe.getCurrencies(r.Context())
	if err != nil {
		renderHTTPError(log, r, w, errors.Wrap(err, "could not retrieve currencies"), http.StatusInternalServerError)
		return
	}
	products, err := fe.getProducts(r.Context())
	if err != nil {
		renderHTTPError(log, r, w, errors.Wrap(err, "could not retrieve products"), 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
	}

	type productView struct {
		Item  *pb.Product
		Price *pb.Money
	}
	ps := make([]productView, len(products))
	for i, p := range products {
		price, err := fe.convertCurrency(r.Context(), p.GetPriceUsd(), currentCurrency(r))
		if err != nil {
			renderHTTPError(log, r, w, errors.Wrapf(err, "failed to do currency conversion for product %s", p.GetId()), http.StatusInternalServerError)
			return
		}
		ps[i] = productView{p, price}
	}

	// Set ENV_PLATFORM (default to local if not set; use env var if set; otherwise detect GCP, which overrides env)_
	var env = os.Getenv("ENV_PLATFORM")
	// Only override from env variable if set + valid env
	if env == "" || !stringinSlice(validEnvs, env) {
		fmt.Println("env platform is either empty or invalid")
		env = "local"
	}
	// Autodetect GCP
	addrs, err := net.LookupHost("metadata.google.internal.")
	if err == nil && len(addrs) >= 0 {
		log.Debugf("Detected Google metadata server: %v, setting ENV_PLATFORM to GCP.", addrs)
		env = "gcp"
	}

	log.Debugf("ENV_PLATFORM is: %s", env)
	plat = platformDetails{}
	plat.setPlatformDetails(strings.ToLower(env))

	if err := templates.ExecuteTemplate(w, "home", map[string]interface{}{
		"session_id":        sessionID(r),
		"request_id":        r.Context().Value(ctxKeyRequestID{}),
		"user_currency":     currentCurrency(r),
		"show_currency":     true,
		"currencies":        currencies,
		"products":          ps,
		"cart_size":         cartSize(cart),
		"banner_color":      os.Getenv("BANNER_COLOR"), // illustrates canary deployments
		"ad":                fe.chooseAd(r.Context(), []string{}, log),
		"platform_css":      plat.css,
		"platform_name":     plat.provider,
		"is_cymbal_brand":   isCymbalBrand,
		"deploymentDetails": deploymentDetailsMap,
	}); err != nil {
		log.Error(err)
	}
}