main.go

package main

import (
	"fmt"
	"net"
	"os"
	"time"

	"github.com/sirupsen/logrus"
	"golang.org/x/net/context"
	"google.golang.org/grpc"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/reflection"
	"google.golang.org/grpc/status"

	pb "github.com/abruneau/hipstershop/src/shippingservice/genproto"
	healthpb "google.golang.org/grpc/health/grpc_health_v1"
)

const (
	defaultPort = "50051"
)

var log *logrus.Logger

func init() {
	log = logrus.New()
	log.Level = logrus.DebugLevel
	log.Formatter = &logrus.JSONFormatter{
		FieldMap: logrus.FieldMap{
			logrus.FieldKeyTime:  "timestamp",
			logrus.FieldKeyLevel: "severity",
			logrus.FieldKeyMsg:   "message",
		},
		TimestampFormat: time.RFC3339Nano,
	}
	log.Out = os.Stdout
}

func main() {
	port := defaultPort
	if value, ok := os.LookupEnv("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)
	}

	var srv *grpc.Server
	srv = grpc.NewServer()
	svc := &server{}
	pb.RegisterShippingServiceServer(srv, svc)
	healthpb.RegisterHealthServer(srv, svc)
	log.Infof("Shipping Service listening on port %s", port)

	// Register reflection service on gRPC server.
	reflection.Register(srv)
	if err := srv.Serve(lis); err != nil {
		log.Fatalf("failed to serve: %v", err)
	}
}

// server controls RPC service responses.
type server struct{}

// Check is for health checking.
func (s *server) Check(ctx context.Context, req *healthpb.HealthCheckRequest) (*healthpb.HealthCheckResponse, error) {
	return &healthpb.HealthCheckResponse{Status: healthpb.HealthCheckResponse_SERVING}, nil
}

func (s *server) Watch(req *healthpb.HealthCheckRequest, ws healthpb.Health_WatchServer) error {
	return status.Errorf(codes.Unimplemented, "health check via Watch not implemented")
}

// GetQuote produces a shipping quote (cost) in USD.
func (s *server) GetQuote(ctx context.Context, in *pb.GetQuoteRequest) (*pb.GetQuoteResponse, error) {
	log.Info("[GetQuote] received request")
	defer log.Info("[GetQuote] completed request")

	// 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.Money{
			CurrencyCode: "USD",
			Units:        int64(quote.Dollars),
			Nanos:        int32(quote.Cents * 10000000)},
	}, 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) {
	log.Info("[ShipOrder] received request")
	defer log.Info("[ShipOrder] completed request")
	// 1. Create a Tracking ID
	baseAddress := fmt.Sprintf("%s, %s, %s", in.Address.StreetAddress, in.Address.City, in.Address.State)
	id := CreateTrackingID(baseAddress)

	// 2. Generate a response.
	return &pb.ShipOrderResponse{
		TrackingId: id,
	}, nil
}