forked from TrueCloudLab/frostfs-node
96 lines
2.4 KiB
Go
96 lines
2.4 KiB
Go
package meta
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import (
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"fmt"
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"github.com/nspcc-dev/neofs-api-go/pkg/container"
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objectSDK "github.com/nspcc-dev/neofs-api-go/pkg/object"
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"github.com/nspcc-dev/neofs-node/pkg/core/object"
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"go.etcd.io/bbolt"
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)
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// Get returns object header for specified address.
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func (db *DB) Get(addr *objectSDK.Address) (obj *object.Object, err error) {
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err = db.boltDB.View(func(tx *bbolt.Tx) error {
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obj, err = db.get(tx, addr, true)
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return err
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})
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return obj, err
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}
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func (db *DB) get(tx *bbolt.Tx, addr *objectSDK.Address, checkGraveyard bool) (*object.Object, error) {
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obj := object.New()
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key := objectKey(addr.ObjectID())
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cid := addr.ContainerID()
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if checkGraveyard && inGraveyard(tx, addr) {
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return nil, object.ErrAlreadyRemoved
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}
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// check in primary index
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data := getFromBucket(tx, primaryBucketName(cid), key)
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if len(data) != 0 {
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return obj, obj.Unmarshal(data)
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}
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// if not found then check in tombstone index
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data = getFromBucket(tx, tombstoneBucketName(cid), key)
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if len(data) != 0 {
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return obj, obj.Unmarshal(data)
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}
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// if not found then check in storage group index
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data = getFromBucket(tx, storageGroupBucketName(cid), key)
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if len(data) != 0 {
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return obj, obj.Unmarshal(data)
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}
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// if not found then check if object is a virtual
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return getVirtualObject(tx, cid, key)
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}
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func getFromBucket(tx *bbolt.Tx, name, key []byte) []byte {
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bkt := tx.Bucket(name)
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if bkt == nil {
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return nil
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}
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return bkt.Get(key)
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}
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func getVirtualObject(tx *bbolt.Tx, cid *container.ID, key []byte) (*object.Object, error) {
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parentBucket := tx.Bucket(parentBucketName(cid))
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if parentBucket == nil {
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return nil, object.ErrNotFound
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}
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relativeLst, err := decodeList(parentBucket.Get(key))
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if err != nil {
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return nil, err
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}
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if len(relativeLst) == 0 { // this should never happen though
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return nil, object.ErrNotFound
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}
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// pick last item, for now there is not difference which address to pick
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// but later list might be sorted so first or last value can be more
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// prioritized to choose
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virtualOID := relativeLst[len(relativeLst)-1]
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data := getFromBucket(tx, primaryBucketName(cid), virtualOID)
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child := object.New()
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err = child.Unmarshal(data)
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if err != nil {
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return nil, fmt.Errorf("can't unmarshal child with parent: %w", err)
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}
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if child.GetParent() == nil { // this should never happen though
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return nil, object.ErrNotFound
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}
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return child.GetParent(), nil
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}
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