frostfs-node/pkg/local_object_storage/shard/range.go
Alex Vanin 244e244c0e [#222] Add GetRange method in shard
Signed-off-by: Alex Vanin <alexey@nspcc.ru>
2020-12-11 17:19:37 +03:00

100 lines
2.2 KiB
Go

package shard
import (
objectSDK "github.com/nspcc-dev/neofs-api-go/pkg/object"
"github.com/nspcc-dev/neofs-node/pkg/core/object"
"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/blobovnicza"
"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/blobstor"
)
// RngPrm groups the parameters of GetRange operation.
type RngPrm struct {
ln uint64
off uint64
addr *objectSDK.Address
}
// RngPrm groups resulting values of GetRange operation.
type RngRes struct {
obj *object.Object
}
// WithAddress is a Rng option to set the address of the requested object.
//
// Option is required.
func (p *RngPrm) WithAddress(addr *objectSDK.Address) *RngPrm {
if p != nil {
p.addr = addr
}
return p
}
// WithRange is a GetRange option to set range of requested payload data.
func (p *RngPrm) WithRange(off uint64, ln uint64) *RngPrm {
if p != nil {
p.off, p.ln = off, ln
}
return p
}
// Object returns the requested object part.
//
// Instance payload contains the requested range of the original object.
func (r *RngRes) Object() *object.Object {
return r.obj
}
// GetRange reads part of an object from shard.
//
// Returns any error encountered that
// did not allow to completely read the object part.
func (s *Shard) GetRange(prm *RngPrm) (*RngRes, error) {
var big, small storFetcher
rng := objectSDK.NewRange()
rng.SetOffset(prm.off)
rng.SetLength(prm.ln)
big = func(stor *blobstor.BlobStor, _ *blobovnicza.ID) (*object.Object, error) {
getRngBigPrm := new(blobstor.GetRangeBigPrm)
getRngBigPrm.SetAddress(prm.addr)
getRngBigPrm.SetRange(rng)
res, err := stor.GetRangeBig(getRngBigPrm)
if err != nil {
return nil, err
}
obj := object.NewRaw()
obj.SetPayload(res.RangeData())
return obj.Object(), nil
}
small = func(stor *blobstor.BlobStor, id *blobovnicza.ID) (*object.Object, error) {
getRngSmallPrm := new(blobstor.GetRangeSmallPrm)
getRngSmallPrm.SetAddress(prm.addr)
getRngSmallPrm.SetRange(rng)
getRngSmallPrm.SetBlobovniczaID(id)
res, err := stor.GetRangeSmall(getRngSmallPrm)
if err != nil {
return nil, err
}
obj := object.NewRaw()
obj.SetPayload(res.RangeData())
return obj.Object(), nil
}
obj, err := s.fetchObjectData(prm.addr, big, small)
return &RngRes{
obj: obj,
}, err
}