feat(registry): consul get service support remote (#2275)

* feat(registry): consul get service support remote acces

* fix lint

contrib/registry/consul/registry.go

@@ -100,19 +100,33 @@ func (r *Registry) Deregister(ctx context.Context, svc *registry.ServiceInstance
 }
 
 // GetService return service by name
-func (r *Registry) GetService(ctx context.Context, name string) (services []*registry.ServiceInstance, err error) {
+func (r *Registry) GetService(ctx context.Context, name string) ([]*registry.ServiceInstance, error) {
 	r.lock.RLock()
 	defer r.lock.RUnlock()
 	set := r.registry[name]
+
+	getRemote := func() []*registry.ServiceInstance {
+		services, _, err := r.cli.Service(ctx, name, 0, true)
+		if err == nil && len(services) > 0 {
+			return services
+		}
+		return nil
+	}
+
 	if set == nil {
+		if s := getRemote(); len(s) > 0 {
+			return s, nil
+		}
 		return nil, fmt.Errorf("service %s not resolved in registry", name)
 	}
 	ss, _ := set.services.Load().([]*registry.ServiceInstance)
 	if ss == nil {
+		if s := getRemote(); len(s) > 0 {
+			return s, nil
+		}
 		return nil, fmt.Errorf("service %s not found in registry", name)
 	}
-	services = append(services, ss...)
-	return
+	return ss, nil
 }
 
 // ListServices return service list.