v3 refactor (#1868)

* Move to v3

Co-authored-by: Ben Toogood <bentoogood@gmail.com>

registry/registry.go

@@ -13,8 +13,6 @@ const (
 )
 
 var (
-	DefaultRegistry = NewRegistry()
-
 	// Not found error when GetService is called
 	ErrNotFound = errors.New("service not found")
 	// Watcher stopped error when watcher is stopped
@@ -73,32 +71,3 @@ type DeregisterOption func(*DeregisterOptions)
 type GetOption func(*GetOptions)
 
 type ListOption func(*ListOptions)
-
-// Register a service node. Additionally supply options such as TTL.
-func Register(s *Service, opts ...RegisterOption) error {
-	return DefaultRegistry.Register(s, opts...)
-}
-
-// Deregister a service node
-func Deregister(s *Service) error {
-	return DefaultRegistry.Deregister(s)
-}
-
-// Retrieve a service. A slice is returned since we separate Name/Version.
-func GetService(name string) ([]*Service, error) {
-	return DefaultRegistry.GetService(name)
-}
-
-// List the services. Only returns service names
-func ListServices() ([]*Service, error) {
-	return DefaultRegistry.ListServices()
-}
-
-// Watch returns a watcher which allows you to track updates to the registry.
-func Watch(opts ...WatchOption) (Watcher, error) {
-	return DefaultRegistry.Watch(opts...)
-}
-
-func String() string {
-	return DefaultRegistry.String()
-}