add a noop registry

registry/noop/noop.go

@@ -0,0 +1,41 @@
+// Package noop is a registry which does nothing
+package noop
+
+import (
+	"errors"
+
+	"github.com/micro/go-micro/v3/registry"
+)
+
+type noopRegistry struct{}
+
+func (n *noopRegistry) Init(o ...registry.Option) error {
+	return nil
+}
+
+func (n *noopRegistry) Options() registry.Options {
+	return registry.Options{}
+}
+
+func (n *noopRegistry) Register(*registry.Service, ...registry.RegisterOption) error {
+	return nil
+}
+
+func (n *noopRegistry) Deregister(*registry.Service, ...registry.DeregisterOption) error {
+	return nil
+}
+
+func (n *noopRegistry) GetService(s string, o ...registry.GetOption) ([]*registry.Service, error) {
+	return []*registry.Service{}, nil
+}
+
+func (n *noopRegistry) ListServices(...registry.ListOption) ([]*registry.Service, error) {
+	return []*registry.Service{}, nil
+}
+func (n *noopRegistry) Watch(...registry.WatchOption) (registry.Watcher, error) {
+	return nil, errors.New("not implemented")
+}
+
+func (n *noopRegistry) String() string {
+	return "noop"
+}

server/grpc/grpc.go

@@ -595,6 +595,11 @@ func (g *grpcServer) Register() error {
 	config := g.opts
 	g.RUnlock()
 
+	// only register if it exists or is not noop
+	if config.Registry == nil || config.Registry.String() == "noop" {
+		return nil
+	}
+
 	regFunc := func(service *registry.Service) error {
 		var regErr error
 
@@ -779,6 +784,11 @@ func (g *grpcServer) Deregister() error {
 	config := g.opts
 	g.RUnlock()
 
+	// only register if it exists or is not noop
+	if config.Registry == nil || config.Registry.String() == "noop" {
+		return nil
+	}
+
 	// check the advertise address first
 	// if it exists then use it, otherwise
 	// use the address

server/mucp/rpc_server.go

@@ -522,6 +522,11 @@ func (s *rpcServer) Register() error {
 	config := s.Options()
 	s.RUnlock()
 
+	// only register if it exists or is not noop
+	if config.Registry == nil || config.Registry.String() == "noop" {
+		return nil
+	}
+
 	regFunc := func(service *registry.Service) error {
 		// create registry options
 		rOpts := []registry.RegisterOption{
@@ -730,6 +735,11 @@ func (s *rpcServer) Deregister() error {
 	config := s.Options()
 	s.RUnlock()
 
+	// only register if it exists or is not noop
+	if config.Registry == nil || config.Registry.String() == "noop" {
+		return nil
+	}
+
 	// check the advertise address first
 	// if it exists then use it, otherwise
 	// use the address