frostfs-node/pkg/local_object_storage/metabase/get.go
Alex Vanin bf7a390304 [] metabase: Support raw flag in Get method
Signed-off-by: Alex Vanin <alexey@nspcc.ru>
2020-12-11 17:19:37 +03:00

169 lines
3.9 KiB
Go

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
raw bool
}
// 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
}
// 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() *object.Object {
return r.hdr
}
// Get reads 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
}
// GetRaw reads physically stored object from DB.
func GetRaw(db *DB, addr *objectSDK.Address, raw bool) (*object.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.
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 *objectSDK.Address, checkGraveyard, raw 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, 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 *container.ID, key []byte, raw bool) (*object.Object, error) {
if raw {
return nil, getSplitInfoError(tx, cid, key)
}
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
}
func getSplitInfoError(tx *bbolt.Tx, cid *container.ID, key []byte) error {
splitInfo, err := getSplitInfo(tx, cid, key)
if err == nil {
return objectSDK.NewSplitInfoError(splitInfo)
}
return object.ErrNotFound
}