[#1115] blobovnicza: remove GetRange method

It is unused and incorrect as described in FIXME.

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>

pkg/local_object_storage/blobovnicza/get_range.go

@@ -1,72 +0,0 @@
-package blobovnicza
-
-import (
-	"fmt"
-
-	"github.com/nspcc-dev/neofs-node/pkg/core/object"
-	objectSDK "github.com/nspcc-dev/neofs-sdk-go/object"
-	addressSDK "github.com/nspcc-dev/neofs-sdk-go/object/address"
-)
-
-// GetRangePrm groups the parameters of GetRange operation.
-type GetRangePrm struct {
-	addr *addressSDK.Address
-
-	rng *objectSDK.Range
-}
-
-// GetRangeRes groups resulting values of GetRange operation.
-type GetRangeRes struct {
-	rngData []byte
-}
-
-// SetAddress sets address of the requested object.
-func (p *GetRangePrm) SetAddress(addr *addressSDK.Address) {
-	p.addr = addr
-}
-
-// SetRange sets range of the requested payload data .
-func (p *GetRangePrm) SetRange(rng *objectSDK.Range) {
-	p.rng = rng
-}
-
-// RangeData returns the requested payload data range.
-func (p *GetRangeRes) RangeData() []byte {
-	return p.rngData
-}
-
-// GetRange reads range of 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. Returns ErrRangeOutOfBounds
-// if requested range is outside the payload.
-func (b *Blobovnicza) GetRange(prm *GetRangePrm) (*GetRangeRes, error) {
-	res, err := b.Get(&GetPrm{
-		addr: prm.addr,
-	})
-	if err != nil {
-		return nil, err
-	}
-
-	// FIXME: code below is incorrect because Get returns raw object data
-	//  so we should unmarshal payload from it before. If blobovnicza
-	//  stores objects in non-protocol format (e.g. compressed)
-	//  then it should not provide GetRange method.
-
-	from := prm.rng.GetOffset()
-	to := from + prm.rng.GetLength()
-	payload := res.obj
-
-	if from > to {
-		return nil, fmt.Errorf("invalid range [%d:%d]", from, to)
-	} else if uint64(len(payload)) < to {
-		return nil, object.ErrRangeOutOfBounds
-	}
-
-	return &GetRangeRes{
-		rngData: payload[from:to],
-	}, nil
-}