func()

in src/checkout/main.go [335:374]

• 35 lines of code
• 6 McCabe index (conditional complexity)

func (cs *checkout) prepareOrderItemsAndShippingQuoteFromCart(ctx context.Context, userID, userCurrency string, address *pb.Address) (orderPrep, error) {

	ctx, span := tracer.Start(ctx, "prepareOrderItemsAndShippingQuoteFromCart")
	defer span.End()

	var out orderPrep
	cartItems, err := cs.getUserCart(ctx, userID)
	if err != nil {
		return out, fmt.Errorf("cart failure: %+v", err)
	}
	orderItems, err := cs.prepOrderItems(ctx, cartItems, userCurrency)
	if err != nil {
		return out, fmt.Errorf("failed to prepare order: %+v", err)
	}
	shippingUSD, err := cs.quoteShipping(ctx, address, cartItems)
	if err != nil {
		return out, fmt.Errorf("shipping quote failure: %+v", err)
	}
	shippingPrice, err := cs.convertCurrency(ctx, shippingUSD, userCurrency)
	if err != nil {
		return out, fmt.Errorf("failed to convert shipping cost to currency: %+v", err)
	}

	out.shippingCostLocalized = shippingPrice
	out.cartItems = cartItems
	out.orderItems = orderItems

	var totalCart int32
	for _, ci := range cartItems {
		totalCart += ci.Quantity
	}
	shippingCostFloat, _ := strconv.ParseFloat(fmt.Sprintf("%d.%02d", shippingPrice.GetUnits(), shippingPrice.GetNanos()/1000000000), 64)

	span.SetAttributes(
		attribute.Float64("app.shipping.amount", shippingCostFloat),
		attribute.Int("app.cart.items.count", int(totalCart)),
		attribute.Int("app.order.items.count", len(orderItems)),
	)
	return out, nil
}