[#199] Create metabase instance as storage engine component

Signed-off-by: Alex Vanin <alexey@nspcc.ru>

pkg/local_object_storage/metabase/v2/control.go

@@ -0,0 +1,42 @@
+package meta
+
+import (
+	"fmt"
+	"os"
+	"path"
+
+	"go.etcd.io/bbolt"
+	"go.uber.org/zap"
+)
+
+// Open boltDB instance for metabase.
+func (db *DB) Open() error {
+	err := os.MkdirAll(path.Dir(db.info.Path), db.info.Permission)
+	if err != nil {
+		return fmt.Errorf("can't create dir %s for metabase: %w", db.info.Path, err)
+	}
+
+	db.log.Debug("created directory for Metabase", zap.String("path", db.info.Path))
+
+	db.boltDB, err = bbolt.Open(db.info.Path, db.info.Permission, db.boltOptions)
+	if err != nil {
+		return fmt.Errorf("can't open boltDB database: %w", err)
+	}
+
+	db.log.Debug("opened boltDB instance for Metabase")
+
+	return nil
+}
+
+// Init initializes metabase, however metabase doesn't need extra preparations,
+// so it implemented to satisfy interface of storage engine components.
+func (db *DB) Init() error {
+	db.log.Debug("Metabase has been initialized")
+
+	return nil
+}
+
+// Close closes boltDB instance.
+func (db *DB) Close() error {
+	return db.boltDB.Close()
+}

pkg/local_object_storage/metabase/v2/db.go

@@ -3,6 +3,7 @@ package meta
 import (
 	"encoding/binary"
 	"encoding/hex"
+	"os"
 	"strconv"
 
 	"github.com/nspcc-dev/neofs-api-go/pkg/object"
@@ -14,30 +15,36 @@ import (
 
 // DB represents local metabase of storage node.
 type DB struct {
-	info Info
-
 	*cfg
 
 	matchers map[object.SearchMatchType]func(string, []byte, string) bool
+
+	boltDB *bbolt.DB
 }
 
 // Option is an option of DB constructor.
 type Option func(*cfg)
 
 type cfg struct {
-	boltDB *bbolt.DB
+	boltOptions *bbolt.Options // optional
+
+	info Info
 
 	log *logger.Logger
 }
 
 func defaultCfg() *cfg {
 	return &cfg{
+		info: Info{
+			Permission: os.ModePerm, // 0777
+		},
+
 		log: zap.L(),
 	}
 }
 
-// NewDB creates, initializes and returns DB instance.
-func NewDB(opts ...Option) *DB {
+// New creates and returns new Metabase instance.
+func New(opts ...Option) *DB {
 	c := defaultCfg()
 
 	for i := range opts {
@@ -45,9 +52,6 @@ func NewDB(opts ...Option) *DB {
 	}
 
 	return &DB{
-		info: Info{
-			Path: c.boltDB.Path(),
-		},
 		cfg: c,
 		matchers: map[object.SearchMatchType]func(string, []byte, string) bool{
 			object.MatchUnknown:     unknownMatcher,
@@ -56,10 +60,6 @@ func NewDB(opts ...Option) *DB {
 	}
 }
 
-func (db *DB) Close() error {
-	return db.boltDB.Close()
-}
-
 func stringEqualMatcher(key string, objVal []byte, filterVal string) bool {
 	switch key {
 	default:
@@ -100,16 +100,31 @@ func bucketKeyHelper(hdr string, val string) []byte {
 	}
 }
 
-// FromBoltDB returns option to construct DB from BoltDB instance.
-func FromBoltDB(db *bbolt.DB) Option {
-	return func(c *cfg) {
-		c.boltDB = db
-	}
-}
-
 // WithLogger returns option to set logger of DB.
 func WithLogger(l *logger.Logger) Option {
 	return func(c *cfg) {
 		c.log = l
 	}
 }
+
+// WithBoltDBOptions returns option to specify BoltDB options.
+func WithBoltDBOptions(opts *bbolt.Options) Option {
+	return func(c *cfg) {
+		c.boltOptions = opts
+	}
+}
+
+// WithPath returns option to set system path to Metabase.
+func WithPath(path string) Option {
+	return func(c *cfg) {
+		c.info.Path = path
+	}
+}
+
+// WithPermissions returns option to specify permission bits
+// of Metabase system path.
+func WithPermissions(perm os.FileMode) Option {
+	return func(c *cfg) {
+		c.info.Permission = perm
+	}
+}

pkg/local_object_storage/metabase/v2/db_test.go

@@ -15,7 +15,6 @@ import (
 	"github.com/nspcc-dev/neofs-node/pkg/util/test"
 	"github.com/nspcc-dev/tzhash/tz"
 	"github.com/stretchr/testify/require"
-	"go.etcd.io/bbolt"
 )
 
 func testSelect(t *testing.T, db *meta.DB, fs objectSDK.SearchFilters, exp ...*objectSDK.Address) {
@@ -51,10 +50,11 @@ func testOID() *objectSDK.ID {
 func newDB(t testing.TB) *meta.DB {
 	path := t.Name()
 
-	bdb, err := bbolt.Open(path, 0600, nil)
-	require.NoError(t, err)
+	bdb := meta.New(meta.WithPath(path), meta.WithPermissions(0600))
 
-	return meta.NewDB(meta.FromBoltDB(bdb))
+	require.NoError(t, bdb.Open())
+
+	return bdb
 }
 
 func releaseDB(db *meta.DB) {

pkg/local_object_storage/metabase/v2/info.go

@@ -1,9 +1,16 @@
 package meta
 
+import (
+	"os"
+)
+
 // Info groups the information about DB.
 type Info struct {
 	// Full path to the metabase.
 	Path string
+
+	// Permission of database file.
+	Permission os.FileMode
 }
 
 // DumpInfo returns information about the DB.