frostfs-node/pkg/local_object_storage/metabase/get.go
Elizaveta Chichindaeva cc7a723d77 [#1320] English Check
Signed-off-by: Elizaveta Chichindaeva <elizaveta@nspcc.ru>
2022-05-11 10:40:02 +03:00

198 lines
4.6 KiB
Go

package meta
import (
"fmt"
apistatus "github.com/nspcc-dev/neofs-sdk-go/client/status"
cid "github.com/nspcc-dev/neofs-sdk-go/container/id"
objectSDK "github.com/nspcc-dev/neofs-sdk-go/object"
addressSDK "github.com/nspcc-dev/neofs-sdk-go/object/address"
"go.etcd.io/bbolt"
)
// GetPrm groups the parameters of Get operation.
type GetPrm struct {
addr *addressSDK.Address
raw bool
}
// GetRes groups the resulting values of Get operation.
type GetRes struct {
hdr *objectSDK.Object
}
// WithAddress is a Get option to set the address of the requested object.
//
// Option is required.
func (p *GetPrm) WithAddress(addr *addressSDK.Address) *GetPrm {
if p != nil {
p.addr = addr
}
return p
}
// WithRaw is a Get option to set raw flag value. If flag is unset, then Get
// returns header of virtual object, otherwise it returns SplitInfo of virtual
// object.
func (p *GetPrm) WithRaw(raw bool) *GetPrm {
if p != nil {
p.raw = raw
}
return p
}
// Header returns the requested object header.
func (r *GetRes) Header() *objectSDK.Object {
return r.hdr
}
// Get reads the object from DB.
func Get(db *DB, addr *addressSDK.Address) (*objectSDK.Object, error) {
r, err := db.Get(new(GetPrm).WithAddress(addr))
if err != nil {
return nil, err
}
return r.Header(), nil
}
// GetRaw reads physically stored object from DB.
func GetRaw(db *DB, addr *addressSDK.Address, raw bool) (*objectSDK.Object, error) {
r, err := db.Get(new(GetPrm).WithAddress(addr).WithRaw(raw))
if err != nil {
return nil, err
}
return r.Header(), nil
}
// Get returns object header for specified address.
//
// Returns an error of type apistatus.ObjectNotFound if object is missing in DB.
// Returns an error of type apistatus.ObjectAlreadyRemoved if object has been placed in graveyard.
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, prm.raw)
return err
})
return
}
func (db *DB) get(tx *bbolt.Tx, addr *addressSDK.Address, checkGraveyard, raw bool) (*objectSDK.Object, error) {
obj := objectSDK.New()
key := objectKey(addr.ObjectID())
cid := addr.ContainerID()
if checkGraveyard {
switch inGraveyard(tx, addr) {
case 1:
var errNotFound apistatus.ObjectNotFound
return nil, errNotFound
case 2:
var errRemoved apistatus.ObjectAlreadyRemoved
return nil, errRemoved
}
}
// 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 in locker index
data = getFromBucket(tx, bucketNameLockers(*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, raw)
}
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 *cid.ID, key []byte, raw bool) (*objectSDK.Object, error) {
if raw {
return nil, getSplitInfoError(tx, cid, key)
}
parentBucket := tx.Bucket(parentBucketName(cid))
if parentBucket == nil {
var errNotFound apistatus.ObjectNotFound
return nil, errNotFound
}
relativeLst, err := decodeList(parentBucket.Get(key))
if err != nil {
return nil, err
}
if len(relativeLst) == 0 { // this should never happen though
var errNotFound apistatus.ObjectNotFound
return nil, 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 := objectSDK.New()
err = child.Unmarshal(data)
if err != nil {
return nil, fmt.Errorf("can't unmarshal child with parent: %w", err)
}
par := child.Parent()
if par == nil { // this should never happen though
var errNotFound apistatus.ObjectNotFound
return nil, errNotFound
}
return par, nil
}
func getSplitInfoError(tx *bbolt.Tx, cid *cid.ID, key []byte) error {
splitInfo, err := getSplitInfo(tx, cid, key)
if err == nil {
return objectSDK.NewSplitInfoError(splitInfo)
}
var errNotFound apistatus.ObjectNotFound
return errNotFound
}