storage interface: remove Backends()

pkg/storage/cacher.go

@@ -244,11 +244,6 @@ func (c *Cacher) startCaching(stopChannel <-chan struct{}) {
 }
 
 // Implements storage.Interface.
-func (c *Cacher) Backends(ctx context.Context) []string {
-	return c.storage.Backends(ctx)
-}
-
-// Implements storage.Interface.
 func (c *Cacher) Versioner() Versioner {
 	return c.storage.Versioner()
 }

pkg/storage/etcd/etcd_helper.go

@@ -91,23 +91,6 @@ func (h *etcdHelper) Codec() runtime.Codec {
 }
 
 // Implements storage.Interface.
-func (h *etcdHelper) Backends(ctx context.Context) []string {
-	if ctx == nil {
-		glog.Errorf("Context is nil")
-	}
-	members, err := h.etcdMembersAPI.List(ctx)
-	if err != nil {
-		glog.Errorf("Error obtaining etcd members list: %q", err)
-		return nil
-	}
-	mlist := []string{}
-	for _, member := range members {
-		mlist = append(mlist, member.ClientURLs...)
-	}
-	return mlist
-}
-
-// Implements storage.Interface.
 func (h *etcdHelper) Versioner() storage.Versioner {
 	return h.versioner
 }

pkg/storage/etcd3/store.go

@@ -73,20 +73,6 @@ func newStore(c *clientv3.Client, codec runtime.Codec, prefix string) *store {
 	}
 }
 
-// Backends implements storage.Interface.Backends.
-func (s *store) Backends(ctx context.Context) []string {
-	resp, err := s.client.MemberList(ctx)
-	if err != nil {
-		glog.Errorf("Error obtaining etcd members list: %q", err)
-		return nil
-	}
-	var mlist []string
-	for _, member := range resp.Members {
-		mlist = append(mlist, member.ClientURLs...)
-	}
-	return mlist
-}
-
 // Codec implements storage.Interface.Codec.
 func (s *store) Codec() runtime.Codec {
 	return s.codec

pkg/storage/interfaces.go

@@ -112,11 +112,6 @@ func NewUIDPreconditions(uid string) *Preconditions {
 // Interface offers a common interface for object marshaling/unmarshaling operations and
 // hides all the storage-related operations behind it.
 type Interface interface {
-	// Returns list of servers addresses of the underyling database.
-	// TODO: This method is used only in a single place. Consider refactoring and getting rid
-	// of this method from the interface.
-	Backends(ctx context.Context) []string
-
 	// Returns Versioner associated with this interface.
 	Versioner() Versioner