echo-with-grpc-client.go

var grpcClient api.HelloServiceClient

func main() {
	var conn *grpc.ClientConn
	conn, err := grpc.Dial("host.docker.internal:6565", grpc.WithTransportCredentials(insecure.NewCredentials()),
		grpc.WithUnaryInterceptor(otelgrpc.UnaryClientInterceptor()),
		grpc.WithStreamInterceptor(otelgrpc.StreamClientInterceptor()),
	)

	if err != nil {
		log.Fatalf("did not connect: %s", err)
	}
	defer func() { _ = conn.Close() }()

	grpcClient = api.NewHelloServiceClient(conn)

	e := echo.New()
	e.Use(otelecho.Middleware("webserver-echo"))

	e.GET("/", handler)

	e.Logger.Fatal(e.Start(":" + os.Getenv("PORT")))
}