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" ) // GetPrm groups the parameters of Get operation. type GetPrm struct { addr *objectSDK.Address } // GetRes groups resulting values of Get operation. type GetRes struct { hdr *object.Object } // WithAddress is a Get option to set the address of the requested object. // // Option is required. func (p *GetPrm) WithAddress(addr *objectSDK.Address) *GetPrm { if p != nil { p.addr = addr } return p } // Header returns the requested object header. func (r *GetRes) Header() *object.Object { return r.hdr } // Get read the object from DB. func Get(db *DB, addr *objectSDK.Address) (*object.Object, error) { r, err := db.Get(new(GetPrm).WithAddress(addr)) if err != nil { return nil, err } return r.Header(), nil } // Get returns object header for specified address. func (db *DB) Get(prm *GetPrm) (res *GetRes, err error) { res = new(GetRes) err = db.boltDB.View(func(tx *bbolt.Tx) error { res.hdr, err = db.get(tx, prm.addr, true) return err }) return } 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 }