[#223] object: Introduce `ec_parent` search filter

Signed-off-by: Airat Arifullin <a.arifullin@yadro.com>

object/search.go

@@ -120,6 +120,7 @@ const (
 	fKeySplitID
 	fKeyPropRoot
 	fKeyPropPhy
+	fKeyECParent
 )
 
 func (k filterKey) String() string {
@@ -152,6 +153,8 @@ func (k filterKey) String() string {
 		return v2object.FilterPropertyRoot
 	case fKeyPropPhy:
 		return v2object.FilterPropertyPhy
+	case fKeyECParent:
+		return v2object.FilterHeaderECParent
 	}
 }
 
@@ -277,6 +280,10 @@ func (f *SearchFilters) AddSplitIDFilter(m SearchMatchType, id *SplitID) {
 	f.addReservedFilter(m, fKeySplitID, staticStringer(id.String()))
 }
 
+func (f *SearchFilters) AddECParentFilter(m SearchMatchType, parentID oid.ID) {
+	f.addReservedFilter(m, fKeyECParent, staticStringer(parentID.String()))
+}
+
 // AddTypeFilter adds filter by object type.
 func (f *SearchFilters) AddTypeFilter(m SearchMatchType, typ Type) {
 	f.addReservedFilter(m, fKeyType, staticStringer(typ.String()))

object/search_test.go

@@ -160,6 +160,23 @@ func TestSearchFilters_AddSplitIDFilter(t *testing.T) {
 	})
 }
 
+func TestSearchFilters_AddECParentFilter(t *testing.T) {
+	id := testOID()
+
+	fs := new(object.SearchFilters)
+	fs.AddECParentFilter(object.MatchStringEqual, id)
+
+	t.Run("v2", func(t *testing.T) {
+		fsV2 := fs.ToV2()
+
+		require.Len(t, fsV2, 1)
+
+		require.Equal(t, v2object.FilterHeaderECParent, fsV2[0].GetKey())
+		require.Equal(t, id.String(), fsV2[0].GetValue())
+		require.Equal(t, v2object.MatchStringEqual, fsV2[0].GetMatchType())
+	})
+}
+
 func TestSearchFilters_AddTypeFilter(t *testing.T) {
 	typ := object.TypeTombstone