frostfs-node/pkg/local_object_storage/blobovnicza/get.go
Leonard Lyubich eaae5a5dd7 [] blobovnicza: Store objects in a binary format
In previous implementation Blobovnicza's stored objects in protocol format
which did not allow working with externally compressed objects. To achieve
this goal, operations Get and Put no longer work with the structure of the
object, but only with abstract binary data. Operation GetRange has become
incorrect in its original purpose to receive the payload range. In this
regard, BlobStor receives the payload range of the object through Get
operation. In the future either Blobovnicza will learn to compress objects
by itself, or the GetRange operation will be eliminated.

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
2020-12-11 17:19:37 +03:00

69 lines
1.5 KiB
Go

package blobovnicza
import (
objectSDK "github.com/nspcc-dev/neofs-api-go/pkg/object"
"github.com/nspcc-dev/neofs-node/pkg/core/object"
"go.etcd.io/bbolt"
"go.uber.org/zap"
)
// GetPrm groups the parameters of Get operation.
type GetPrm struct {
addr *objectSDK.Address
}
// GetRes groups resulting values of Get operation.
type GetRes struct {
obj []byte
}
// SetAddress sets address of the requested object.
func (p *GetPrm) SetAddress(addr *objectSDK.Address) {
p.addr = addr
}
// Object returns binary representation of the requested object.
func (p *GetRes) Object() []byte {
return p.obj
}
// Get reads the object from Blobovnicza by address.
//
// Returns any error encountered that
// did not allow to completely read the object.
//
// Returns ErrNotFound if requested object is not
// presented in Blobovnicza.
func (b *Blobovnicza) Get(prm *GetPrm) (*GetRes, error) {
var (
data []byte
addrKey = addressKey(prm.addr)
)
if err := b.boltDB.View(func(tx *bbolt.Tx) error {
return b.iterateBuckets(tx, func(lower, upper uint64, buck *bbolt.Bucket) (bool, error) {
data = buck.Get(addrKey)
stop := data != nil
if stop {
b.log.Debug("object is found in bucket",
zap.String("binary size", stringifyByteSize(uint64(len(data)))),
zap.String("range", stringifyBounds(lower, upper)),
)
}
return stop, nil
})
}); err != nil {
return nil, err
}
if data == nil {
return nil, object.ErrNotFound
}
return &GetRes{
obj: data,
}, nil
}