[#1147] node: Implement Lock\Delete requests for EC object

Signed-off-by: Anton Nikiforov <an.nikiforov@yadro.com>

pkg/local_object_storage/shard/exists.go

@@ -13,12 +13,14 @@ import (
 
 // ExistsPrm groups the parameters of Exists operation.
 type ExistsPrm struct {
-	addr oid.Address
+	addr  oid.Address
+	paddr oid.Address
 }
 
 // ExistsRes groups the resulting values of Exists operation.
 type ExistsRes struct {
 	ex bool
+	lc bool
 }
 
 // SetAddress is an Exists option to set object checked for existence.
@@ -26,11 +28,21 @@ func (p *ExistsPrm) SetAddress(addr oid.Address) {
 	p.addr = addr
 }
 
+// SetParentAddress is an Exists option to set parent object checked for existence.
+func (p *ExistsPrm) SetParentAddress(addr oid.Address) {
+	p.paddr = addr
+}
+
 // Exists returns the fact that the object is in the shard.
 func (p ExistsRes) Exists() bool {
 	return p.ex
 }
 
+// Locked returns the fact that the object is locked.
+func (p ExistsRes) Locked() bool {
+	return p.lc
+}
+
 // Exists checks if object is presented in shard.
 //
 // Returns any error encountered that does not allow to
@@ -48,6 +60,7 @@ func (s *Shard) Exists(ctx context.Context, prm ExistsPrm) (ExistsRes, error) {
 	defer span.End()
 
 	var exists bool
+	var locked bool
 	var err error
 
 	s.m.RLock()
@@ -65,13 +78,16 @@ func (s *Shard) Exists(ctx context.Context, prm ExistsPrm) (ExistsRes, error) {
 	} else {
 		var existsPrm meta.ExistsPrm
 		existsPrm.SetAddress(prm.addr)
+		existsPrm.SetParent(prm.paddr)
 
 		var res meta.ExistsRes
 		res, err = s.metaBase.Exists(ctx, existsPrm)
 		exists = res.Exists()
+		locked = res.Locked()
 	}
 
 	return ExistsRes{
 		ex: exists,
+		lc: locked,
 	}, err
 }