package meta import ( "github.com/nspcc-dev/neofs-api-go/pkg/object" "github.com/pkg/errors" "go.etcd.io/bbolt" ) // Select returns list of addresses of objects that match search filters. func (db *DB) Select(fs object.SearchFilters) ([]*object.Address, error) { res := make([]*object.Address, 0) err := db.boltDB.View(func(tx *bbolt.Tx) error { // get indexed bucket indexBucket := tx.Bucket(indexBucket) if indexBucket == nil { // empty storage return nil } if len(fs) == 0 { // get primary bucket primaryBucket := tx.Bucket(primaryBucket) if primaryBucket == nil { // empty storage return nil } // iterate over all stored addresses return primaryBucket.ForEach(func(k, v []byte) error { // check if object marked as deleted if objectRemoved(tx, k) { return nil } addr := object.NewAddress() if err := addr.Parse(string(k)); err != nil { // TODO: storage was broken, so we need to handle it return err } res = append(res, addr) return nil }) } // keep processed addresses // value equal to number (index+1) of latest matched filter mAddr := make(map[string]int) for fNum := range fs { matchFunc, ok := db.matchers[fs[fNum].Operation()] if !ok { return errors.Errorf("no function for matcher %v", fs[fNum].Operation()) } key := fs[fNum].Header() // get bucket with values keyBucket := indexBucket.Bucket([]byte(key)) if keyBucket == nil { // no object has this attribute => empty result return nil } fVal := fs[fNum].Value() // iterate over all existing values for the key if err := keyBucket.ForEach(func(k, v []byte) error { include := matchFunc(string(key), string(cutKeyBytes(k)), fVal) strs, err := decodeAddressList(v) if err != nil { return errors.Wrapf(err, "(%T) could not decode address list", db) } for j := range strs { if num := mAddr[strs[j]]; num != fNum { // than object does not match some previous filter continue } else if include { mAddr[strs[j]] = fNum + 1 } } return nil }); err != nil { return errors.Wrapf(err, "(%T) could not iterate bucket %s", db, key) } } fLen := len(fs) for a, ind := range mAddr { if ind != fLen { continue } // check if object marked as deleted if objectRemoved(tx, []byte(a)) { continue } addr := object.NewAddress() if err := addr.Parse(a); err != nil { // TODO: storage was broken, so we need to handle it return err } res = append(res, addr) } return nil }) return res, err }