From 796bba3793654a48f2c8ff0d9fd5a156cbb1c86a Mon Sep 17 00:00:00 2001
From: Leonard Lyubich <leonard@nspcc.ru>
Date: Wed, 18 Nov 2020 17:38:49 +0300
Subject: [PATCH] [#176] shard: Finalize the implementation of Exists method

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
---
 pkg/local_object_storage/shard/exists.go | 13 +++++++++++--
 pkg/local_object_storage/shard/put.go    |  2 +-
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/pkg/local_object_storage/shard/exists.go b/pkg/local_object_storage/shard/exists.go
index 9fa5e73a1..9a25763a6 100644
--- a/pkg/local_object_storage/shard/exists.go
+++ b/pkg/local_object_storage/shard/exists.go
@@ -2,6 +2,7 @@ package shard
 
 import (
 	"github.com/nspcc-dev/neofs-api-go/pkg/object"
+	"github.com/pkg/errors"
 )
 
 // ExistsPrm groups the parameters of Exists operation.
@@ -33,8 +34,16 @@ func (p *ExistsRes) Exists() bool {
 // Returns any error encountered that does not allow to
 // unambiguously determine the presence of an object.
 func (s *Shard) Exists(prm *ExistsPrm) (*ExistsRes, error) {
-	// FIXME: implement me
+	exists, err := s.objectExists(prm.addr)
+	if err != nil {
+		return nil, errors.Wrap(err, "could not check object presence in metabase")
+	}
+
 	return &ExistsRes{
-		ex: false,
+		ex: exists,
 	}, nil
 }
+
+func (s *Shard) objectExists(addr *object.Address) (bool, error) {
+	return s.metaBase.Exists(addr)
+}
diff --git a/pkg/local_object_storage/shard/put.go b/pkg/local_object_storage/shard/put.go
index 411581dc3..29c74f8bc 100644
--- a/pkg/local_object_storage/shard/put.go
+++ b/pkg/local_object_storage/shard/put.go
@@ -29,7 +29,7 @@ func (p *PutPrm) WithObject(obj *object.Object) *PutPrm {
 // did not allow to completely save the object.
 func (s *Shard) Put(prm *PutPrm) (*PutRes, error) {
 	// check object existence
-	ex, err := s.metaBase.Exists(prm.obj.Address())
+	ex, err := s.objectExists(prm.obj.Address())
 	if err != nil {
 		return nil, errors.Wrap(err, "could not check object existence")
 	} else if ex {