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

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package blobovnicza
import (
objectSDK "github.com/nspcc-dev/neofs-api-go/pkg/object"
"github.com/nspcc-dev/neofs-node/pkg/core/object"
"github.com/pkg/errors"
"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 *object.Object
}
// ErrObjectNotFound is returns on read operations requested on a missing object.
var ErrObjectNotFound = errors.New("object not found")
// SetAddress sets address of the requested object.
func (p *GetPrm) SetAddress(addr *objectSDK.Address) {
p.addr = addr
}
// Object returns the requested object.
func (p *GetRes) Object() *object.Object {
return p.obj
}
// Get reads the object from Blobovnicza by address.
//
// Returns any error encountered that
// did not allow to completely read the object.
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, ErrObjectNotFound
}
// TODO: add decompression step
// unmarshal the object
obj := object.New()
if err := obj.Unmarshal(data); err != nil {
return nil, errors.Wrap(err, "could not unmarshal the object")
}
return &GetRes{
obj: obj,
}, nil
}