Add shipping service.

src/shippingservice/main.go

@@ -0,0 +1,79 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"net"
+	"os"
+
+	"golang.org/x/net/context"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/reflection"
+
+	pb "microservices-demo/pb"
+)
+
+
+const (
+	default_port = "50051"
+)
+
+// server controls RPC service responses.
+type server struct{}
+
+// GetQuote produces a shipping quote (cost) in USD.
+func (s *server) GetQuote(ctx context.Context, in *pb.GetQuoteRequest) (*pb.GetQuoteResponse, error) {
+
+	// 1. Our quote system requires the total number of items to be shipped.
+	count := 0
+	for _, item := range in.Items {
+		count += int(item.Quantity)
+	}
+
+	// 2. Generate a quote based on the total number of items to be shipped.
+	quote := CreateQuoteFromCount(count)
+
+	// 3. Generate a response.
+	return &pb.GetQuoteResponse{
+		CostUsd: &pb.MoneyAmount{
+			Decimal: quote.Dollars,
+			Fractional: quote.Cents,
+		},
+	}, nil
+
+}
+
+// ShipOrder mocks that the requested items will be shipped.
+// It supplies a tracking ID for notional lookup of shipment delivery status.
+func (s *server) ShipOrder(ctx context.Context, in *pb.ShipOrderRequest) (*pb.ShipOrderResponse, error) {
+	// 1. Create a Tracking ID
+	baseAddress := fmt.Sprintf("%s, %s, %s", in.Address.StreetAddress_1, in.Address.StreetAddress_2, in.Address.City)
+	id := CreateTrackingId(baseAddress)
+
+	// 2. Generate a response.
+	return &pb.ShipOrderResponse{
+		TrackingId: id,
+	}, nil
+}
+
+func main() {
+	port := default_port
+	if value, ok := os.LookupEnv("APP_PORT"); ok {
+		port = value
+	}
+	port = fmt.Sprintf(":%s", port)
+
+	lis, err := net.Listen("tcp", port)
+	if err != nil {
+		log.Fatalf("failed to listen: %v", err)
+	}
+	s := grpc.NewServer()
+	pb.RegisterShippingServiceServer(s, &server{})
+	log.Printf("Shipping Service listening on port %s", port)
+
+	// Register reflection service on gRPC server.
+	reflection.Register(s)
+	if err := s.Serve(lis); err != nil {
+		log.Fatalf("failed to serve: %v", err)
+	}
+}