add reflection for grpcurl (open-telemetry#735)

src/productcatalogservice/main.go

@@ -17,20 +17,19 @@ package main
 import (
 	"context"
 	"fmt"
-	"io/ioutil"
-	"net"
-	"os"
-	"strings"
-	"sync"
-	"time"
-
 	pb "github.com/opentelemetry/opentelemetry-demo/src/productcatalogservice/genproto/hipstershop"
 	"github.com/sirupsen/logrus"
 	"go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc"
 	"go.opentelemetry.io/contrib/instrumentation/runtime"
 	"go.opentelemetry.io/otel/metric/global"
 	sdkmetric "go.opentelemetry.io/otel/sdk/metric"
 	healthpb "google.golang.org/grpc/health/grpc_health_v1"
+	"io/ioutil"
+	"net"
+	"os"
+	"strings"
+	"sync"
+	"time"
 
 	"go.opentelemetry.io/otel"
 	"go.opentelemetry.io/otel/attribute"
@@ -48,6 +47,7 @@ import (
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/credentials/insecure"
+	"google.golang.org/grpc/reflection"
 	"google.golang.org/grpc/status"
 )
 
@@ -151,6 +151,8 @@ func main() {
 		grpc.StreamInterceptor(otelgrpc.StreamServerInterceptor()),
 	)
 
+	reflection.Register(srv)
+
 	pb.RegisterProductCatalogServiceServer(srv, svc)
 	healthpb.RegisterHealthServer(srv, svc)
 	srv.Serve(ln)