checkoutservice: partial implementation

Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>

src/checkoutservice/Dockerfile

@@ -0,0 +1,13 @@
+FROM golang:1.10-alpine as builder
+RUN apk add --no-cache ca-certificates git
+WORKDIR /src/microservices-demo/catalogservice
+COPY . .
+RUN go get -d ./...
+RUN go build -v -o /catalogservice .
+
+FROM alpine as release
+RUN apk add --no-cache \
+  ca-certificates
+COPY --from=builder /catalogservice /catalogservice
+EXPOSE 5000
+ENTRYPOINT /catalogservice

src/checkoutservice/main.go

@@ -7,6 +7,9 @@ import (
 	"net"
 	"os"
 
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+
 	pb "./genproto"
 	"google.golang.org/grpc"
 )
@@ -31,21 +34,22 @@ func main() {
 	}
 
 	svc := new(checkoutService)
-	mustMapEnv(&svc.productCatalogSvcAddr, "PRODUCT_CATALOG_SERVICE_ADDR")
-	mustMapEnv(&svc.cartSvcAddr, "CART_SERVICE_ADDR")
-	mustMapEnv(&svc.currencySvcAddr, "CURRENCY_SERVICE_ADDR")
 	mustMapEnv(&svc.shippingSvcAddr, "SHIPPING_SERVICE_ADDR")
-	mustMapEnv(&svc.emailSvcAddr, "EMAIL_SERVICE_ADDR")
+	// mustMapEnv(&svc.productCatalogSvcAddr, "PRODUCT_CATALOG_SERVICE_ADDR")
-	mustMapEnv(&svc.paymentSvcAddr, "PAYMENT_SERVICE_ADDR")
+	// mustMapEnv(&svc.cartSvcAddr, "CART_SERVICE_ADDR")
+	// mustMapEnv(&svc.currencySvcAddr, "CURRENCY_SERVICE_ADDR")
+	// mustMapEnv(&svc.emailSvcAddr, "EMAIL_SERVICE_ADDR")
+	// mustMapEnv(&svc.paymentSvcAddr, "PAYMENT_SERVICE_ADDR")
+
+	log.Printf("service config: %+v", svc)
 
-	log.Printf("starting to listen on tcp/%s", port)
 	lis, err := net.Listen("tcp", fmt.Sprintf(":%s", port))
 	if err != nil {
 		log.Fatal(err)
 	}
 	srv := grpc.NewServer()
 	pb.RegisterCheckoutServiceServer(srv, svc)
-	log.Println("starting to listen on tcp: %q", lis.Addr().String())
+	log.Printf("starting to listen on tcp: %q", lis.Addr().String())
 	log.Fatal(srv.Serve(lis))
 }
 
@@ -60,6 +64,25 @@ func mustMapEnv(target *string, envKey string) {
 func (cs *checkoutService) CreateOrder(ctx context.Context, req *pb.CreateOrderRequest) (*pb.CreateOrderResponse, error) {
 	log.Printf("[CreateOrder] user_id=%q user_currency=%q", req.UserId, req.UserCurrency)
 	resp := new(pb.CreateOrderResponse)
+	conn, err := grpc.Dial(cs.shippingSvcAddr, grpc.WithInsecure())
+	if err != nil {
+		return nil, status.Errorf(codes.Unavailable, "could not connect shippping service: %+v", err)
+	}
+	defer conn.Close()
+
+	shippingQuote, err := pb.NewShippingServiceClient(conn).
+		GetQuote(ctx, &pb.GetQuoteRequest{
+			Address: req.Address,
+			Items:   nil}) // TODO(ahmetb): query CartService for items
+	if err != nil {
+		return nil, status.Errorf(codes.Unavailable, "failed to get shipping quote: %+v", err)
+	}
+	resp.ShippingCost = &pb.Money{
+		Amount:       shippingQuote.GetCostUsd(),
+		CurrencyCode: "USD", // TOD(ahmetb) convert to req.UserCurrency
+	}
+	// TODO(ahmetb) calculate resp.OrderItem with req.UserCurrency
+
 	return resp, nil
 }