frostfs-node/pkg/local_object_storage/metabase/v2/small.go

package meta

import (
	objectSDK "github.com/nspcc-dev/neofs-api-go/pkg/object"
	"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/blobovnicza"
	"go.etcd.io/bbolt"
)

// IsSmall returns blobovniczaID for small objects and nil for big objects.
// Small objects stored in blobovnicza instances. Big objects stored in FS by
// shallow path which is calculated from address and therefore it is not
// indexed in metabase.
func (db *DB) IsSmall(addr *objectSDK.Address) (id *blobovnicza.ID, err error) {
	err = db.boltDB.View(func(tx *bbolt.Tx) error {
		// if graveyard is empty, then check if object exists in primary bucket
		smallBucket := tx.Bucket(smallBucketName(addr.ContainerID()))
		if smallBucket == nil {
			return nil
		}

		blobovniczaID := smallBucket.Get(objectKey(addr.ObjectID()))
		id = blobovnicza.NewIDFromBytes(blobovniczaID)

		return err
	})

	return id, err
}