add grpc-proxy (github.com/mwitkow/grpc-proxy)

Signed-off-by: Adphi <philippe.adrien.nousse@gmail.com>

proxy/testservice/server/main.go

@@ -0,0 +1,54 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"log"
+	"net"
+	"os"
+	"os/signal"
+	"syscall"
+
+	"google.golang.org/grpc"
+
+	"go.linka.cloud/grpc-toolkit/proxy/testservice"
+)
+
+var (
+	port = flag.Uint("port", 8080, "Port to listen to")
+)
+
+func main() {
+	srv := grpc.NewServer()
+	lis, err := net.Listen("tcp", fmt.Sprintf("localhost:%d", *port))
+	if err != nil {
+		panic(err)
+	}
+	testservice.RegisterTestServiceServer(srv, testservice.DefaultTestServiceServer)
+
+	errs := make(chan error)
+
+	go func() {
+		log.Printf("listening on %s", lis.Addr().String())
+		errs <- srv.Serve(lis)
+	}()
+
+	sigs := make(chan os.Signal, 1)
+	signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
+
+	go func() {
+		sig := <-sigs
+		log.Printf("shutdown due to %s", sig)
+		srv.GracefulStop()
+	}()
+
+	if err := <-errs; err != nil {
+		log.Println(err)
+		os.Exit(1)
+	}
+	os.Exit(0)
+}
+
+func init() {
+	flag.Parse()
+}