58 lines
1.3 KiB
Go
58 lines
1.3 KiB
Go
package meta
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import (
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oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
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"go.etcd.io/bbolt"
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)
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// GetChildren returns parent -> children map.
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// If an object has no children, then map will contain addr -> empty slice value.
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func (db *DB) GetChildren(addresses []oid.Address) (map[oid.Address][]oid.Address, error) {
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db.modeMtx.RLock()
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defer db.modeMtx.RUnlock()
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if db.mode.NoMetabase() {
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return nil, ErrDegradedMode
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}
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result := make(map[oid.Address][]oid.Address, len(addresses))
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buffer := make([]byte, bucketKeySize)
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err := db.boltDB.View(func(tx *bbolt.Tx) error {
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for _, addr := range addresses {
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if _, found := result[addr]; found {
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continue
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}
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result[addr] = []oid.Address{}
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bkt := tx.Bucket(parentBucketName(addr.Container(), buffer))
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if bkt == nil {
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continue
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}
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binObjIDs, err := decodeList(bkt.Get(objectKey(addr.Object(), buffer)))
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if err != nil {
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return err
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}
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for _, binObjID := range binObjIDs {
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var id oid.ID
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if err = id.Decode(binObjID); err != nil {
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return err
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}
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var resultAddress oid.Address
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resultAddress.SetContainer(addr.Container())
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resultAddress.SetObject(id)
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result[addr] = append(result[addr], resultAddress)
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}
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}
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return nil
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})
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if err != nil {
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return nil, err
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}
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return result, nil
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}
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