[#137] metabase: Implement Path method

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

pkg/local_object_storage/metabase/db.go

@@ -8,6 +8,8 @@ import (
 
 // DB represents local metabase of storage node.
 type DB struct {
+	path string
+
 	boltDB *bbolt.DB
 
 	matchers map[object.SearchMatchType]func(string, string, string) bool
@@ -16,6 +18,7 @@ type DB struct {
 // NewDB creates, initializes and returns DB instance.
 func NewDB(boltDB *bbolt.DB) *DB {
 	return &DB{
+		path:   boltDB.Path(),
 		boltDB: boltDB,
 		matchers: map[object.SearchMatchType]func(string, string, string) bool{
 			object.MatchStringEqual: stringEqualMatcher,
@@ -27,6 +30,11 @@ func (db *DB) Close() error {
 	return db.boltDB.Close()
 }
 
+// Path returns the path to meta database.
+func (db *DB) Path() string {
+	return db.path
+}
+
 func stringEqualMatcher(key, objVal, filterVal string) bool {
 	switch key {
 	default:

pkg/local_object_storage/metabase/db_test.go

@@ -236,3 +236,19 @@ func TestDB_SelectProperties(t *testing.T) {
 	fs.AddFilter(v2object.FilterPropertyChildfree, "some false value", objectSDK.MatchStringEqual)
 	testSelect(t, db, fs, lnkAddr)
 }
+
+func TestDB_Path(t *testing.T) {
+	path := t.Name()
+
+	bdb, err := bbolt.Open(path, 0600, nil)
+	require.NoError(t, err)
+
+	defer func() {
+		bdb.Close()
+		os.Remove(path)
+	}()
+
+	db := NewDB(bdb)
+
+	require.Equal(t, path, db.Path())
+}