[#159] sdk: Define object range in object pkg

Define Range type in object package. Replace Range in client package with
the new one.

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

pkg/client/object.go

@@ -19,10 +19,6 @@ import (
 	"github.com/pkg/errors"
 )
 
-type Range struct {
-	ln, off uint64
-}
-
 type PutObjectParams struct {
 	obj *object.Object
 
@@ -48,7 +44,7 @@ type ObjectHeaderParams struct {
 type RangeDataParams struct {
 	addr *object.Address
 
-	r *Range
+	r *object.Range
 
 	w io.Writer
 }
@@ -58,7 +54,7 @@ type RangeChecksumParams struct {
 
 	addr *object.Address
 
-	rs []*Range
+	rs []*object.Range
 
 	salt []byte
 }
@@ -93,11 +89,11 @@ const TZSize = 64
 
 const searchQueryVersion uint32 = 1
 
-func rangesToV2(rs []*Range) []*v2object.Range {
+func rangesToV2(rs []*object.Range) []*v2object.Range {
 	r2 := make([]*v2object.Range, 0, len(rs))
 
 	for i := range rs {
-		r2 = append(r2, rs[i].toV2())
+		r2 = append(r2, rs[i].ToV2())
 	}
 
 	return r2
@@ -114,34 +110,6 @@ func (t checksumType) toV2() v2refs.ChecksumType {
 	}
 }
 
-func (r *Range) WithLength(v uint64) *Range {
-	if r != nil {
-		r.ln = v
-	}
-
-	return r
-}
-
-func (r *Range) WithOffset(v uint64) *Range {
-	if r != nil {
-		r.off = v
-	}
-
-	return r
-}
-
-func (r *Range) toV2() *v2object.Range {
-	if r != nil {
-		r2 := new(v2object.Range)
-		r2.SetOffset(r.off)
-		r2.SetLength(r.ln)
-
-		return r2
-	}
-
-	return nil
-}
-
 func (w *putObjectV2Writer) Write(p []byte) (int, error) {
 	w.chunkPart.SetChunk(p)
 
@@ -620,7 +588,7 @@ func (p *RangeDataParams) WithAddress(v *object.Address) *RangeDataParams {
 	return p
 }
 
-func (p *RangeDataParams) WithRange(v *Range) *RangeDataParams {
+func (p *RangeDataParams) WithRange(v *object.Range) *RangeDataParams {
 	if p != nil {
 		p.r = v
 	}
@@ -680,7 +648,7 @@ func (c *Client) objectPayloadRangeV2(ctx context.Context, p *RangeDataParams, o
 
 	// fill body fields
 	body.SetAddress(p.addr.ToV2())
-	body.SetRange(p.r.toV2())
+	body.SetRange(p.r.ToV2())
 
 	// sign the request
 	if err := signature.SignServiceMessage(c.key, req); err != nil {
@@ -695,7 +663,7 @@ func (c *Client) objectPayloadRangeV2(ctx context.Context, p *RangeDataParams, o
 
 	var payload []byte
 	if p.w != nil {
-		payload = make([]byte, p.r.ln)
+		payload = make([]byte, p.r.GetLength())
 	}
 
 	for {
@@ -736,7 +704,7 @@ func (p *RangeChecksumParams) WithAddress(v *object.Address) *RangeChecksumParam
 	return p
 }
 
-func (p *RangeChecksumParams) WithRangeList(rs ...*Range) *RangeChecksumParams {
+func (p *RangeChecksumParams) WithRangeList(rs ...*object.Range) *RangeChecksumParams {
 	if p != nil {
 		p.rs = rs
 	}

pkg/object/range.go

@@ -0,0 +1,47 @@
+package object
+
+import (
+	"github.com/nspcc-dev/neofs-api-go/v2/object"
+)
+
+// Range represents v2-compatible object payload range.
+type Range object.Range
+
+// NewRangeFromV2 wraps v2 Range message to Range.
+func NewRangeFromV2(rV2 *object.Range) *Range {
+	return (*Range)(rV2)
+}
+
+// NewRange creates and initializes blank Range.
+func NewRange() *Range {
+	return NewRangeFromV2(new(object.Range))
+}
+
+// ToV2 converts Range to v2 Range message.
+func (r *Range) ToV2() *object.Range {
+	return (*object.Range)(r)
+}
+
+// GetLength returns payload range size.
+func (r *Range) GetLength() uint64 {
+	return (*object.Range)(r).
+		GetLength()
+}
+
+// SetLength sets payload range size.
+func (r *Range) SetLength(v uint64) {
+	(*object.Range)(r).
+		SetLength(v)
+}
+
+// GetOffset sets payload range offset from start.
+func (r *Range) GetOffset() uint64 {
+	return (*object.Range)(r).
+		GetOffset()
+}
+
+// SetOffset gets payload range offset from start.
+func (r *Range) SetOffset(v uint64) {
+	(*object.Range)(r).
+		SetOffset(v)
+}

pkg/object/range_test.go

@@ -0,0 +1,25 @@
+package object
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestRange_SetOffset(t *testing.T) {
+	r := NewRange()
+
+	off := uint64(13)
+	r.SetOffset(off)
+
+	require.Equal(t, off, r.GetOffset())
+}
+
+func TestRange_SetLength(t *testing.T) {
+	r := NewRange()
+
+	ln := uint64(7)
+	r.SetLength(ln)
+
+	require.Equal(t, ln, r.GetLength())
+}