frostfs-node/pkg/local_object_storage/metabase/get.go

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