150 lines
3.4 KiB
Go
150 lines
3.4 KiB
Go
package meta
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import (
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"github.com/nspcc-dev/neofs-api-go/pkg/object"
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v2object "github.com/nspcc-dev/neofs-api-go/v2/object"
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"github.com/pkg/errors"
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"go.etcd.io/bbolt"
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)
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// Select returns list of addresses of objects that match search filters.
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func (db *DB) Select(fs object.SearchFilters) (res []*object.Address, err error) {
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err = db.boltDB.View(func(tx *bbolt.Tx) error {
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res, err = db.selectObjects(tx, fs)
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return err
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})
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return
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}
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func (db *DB) selectObjects(tx *bbolt.Tx, fs object.SearchFilters) ([]*object.Address, error) {
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if len(fs) == 0 {
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return db.selectAll(tx)
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}
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// get indexed bucket
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indexBucket := tx.Bucket(indexBucket)
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if indexBucket == nil {
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// empty storage
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return nil, nil
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}
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// keep processed addresses
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// value equal to number (index+1) of latest matched filter
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mAddr := make(map[string]int)
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for fNum := range fs {
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matchFunc, ok := db.matchers[fs[fNum].Operation()]
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if !ok {
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return nil, errors.Errorf("no function for matcher %v", fs[fNum].Operation())
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}
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key := fs[fNum].Header()
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// get bucket with values
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keyBucket := indexBucket.Bucket([]byte(key))
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if keyBucket == nil {
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// no object has this attribute => empty result
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return nil, nil
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}
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fVal := fs[fNum].Value()
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// iterate over all existing values for the key
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if err := keyBucket.ForEach(func(k, v []byte) error {
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include := matchFunc(key, string(cutKeyBytes(k)), fVal)
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if include {
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return keyBucket.Bucket(k).ForEach(func(k, _ []byte) error {
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if num := mAddr[string(k)]; num == fNum {
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// otherwise object does not match current or some previous filter
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mAddr[string(k)] = fNum + 1
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}
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return nil
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})
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}
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return nil
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}); err != nil {
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return nil, errors.Wrapf(err, "(%T) could not iterate bucket %s", db, key)
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}
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}
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fLen := len(fs)
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res := make([]*object.Address, 0, len(mAddr))
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for a, ind := range mAddr {
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if ind != fLen {
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continue
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}
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// check if object marked as deleted
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if objectRemoved(tx, []byte(a)) {
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continue
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}
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addr := object.NewAddress()
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if err := addr.Parse(a); err != nil {
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// TODO: storage was broken, so we need to handle it
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return nil, err
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}
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res = append(res, addr)
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}
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return res, nil
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}
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func (db *DB) selectAll(tx *bbolt.Tx) ([]*object.Address, error) {
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result := map[string]struct{}{}
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primaryBucket := tx.Bucket(primaryBucket)
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indexBucket := tx.Bucket(indexBucket)
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if primaryBucket == nil || indexBucket == nil {
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return nil, nil
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}
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if err := primaryBucket.ForEach(func(k, _ []byte) error {
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result[string(k)] = struct{}{}
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return nil
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}); err != nil {
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return nil, errors.Wrapf(err, "(%T) could not iterate primary bucket", db)
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}
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rootBucket := indexBucket.Bucket([]byte(v2object.FilterPropertyRoot))
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if rootBucket != nil {
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rootBucket = rootBucket.Bucket(nonEmptyKeyBytes(nil))
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}
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if rootBucket != nil {
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if err := rootBucket.ForEach(func(k, v []byte) error {
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result[string(k)] = struct{}{}
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return nil
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}); err != nil {
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return nil, errors.Wrapf(err, "(%T) could not iterate root bucket", db)
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}
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}
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list := make([]*object.Address, 0, len(result))
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for k := range result {
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// check if object marked as deleted
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if objectRemoved(tx, []byte(k)) {
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continue
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}
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addr := object.NewAddress()
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if err := addr.Parse(k); err != nil {
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return nil, err // TODO: storage was broken, so we need to handle it
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}
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list = append(list, addr)
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}
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return list, nil
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}
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