[#224] object: Introduce parent attributes in EC-header

Signed-off-by: Airat Arifullin <a.arifullin@yadro.com>

object/erasure_code.go

@@ -13,18 +13,34 @@ type ECHeader struct {
 	parent              oid.ID
 	parentSplitID       *SplitID
 	parentSplitParentID *oid.ID
+	parentAttributes    []Attribute
 	index               uint32
 	total               uint32
 	header              []byte
 	headerLength        uint32
 }
 
+type ECParentInfo struct {
+	// EC-parent's ID.
+	ID oid.ID
+
+	// EC-parent's split ID if the parent is a part of Split itself.
+	SplitID *SplitID
+
+	// EC-parent's parent split ID if the parent is a part of Split itself.
+	SplitParentID *oid.ID
+
+	// EC-parent's attributes.
+	Attributes []Attribute
+}
+
 // NewECHeader constructs new erasure coding header.
-func NewECHeader(parent oid.ID, parentSplitID *SplitID, parentSplitParentID *oid.ID, index, total uint32, header []byte, headerLength uint32) *ECHeader {
+func NewECHeader(ecParentInfo ECParentInfo, index, total uint32, header []byte, headerLength uint32) *ECHeader {
 	return &ECHeader{
-		parent:              parent,
-		parentSplitID:       parentSplitID,
-		parentSplitParentID: parentSplitParentID,
+		parent:              ecParentInfo.ID,
+		parentSplitID:       ecParentInfo.SplitID,
+		parentSplitParentID: ecParentInfo.SplitParentID,
+		parentAttributes:    ecParentInfo.Attributes,
 		index:               index,
 		total:               total,
 		header:              header,
@@ -45,6 +61,13 @@ func (e *ECHeader) WriteToV2(h *object.ECHeader) {
 	}
 
 	h.Parent = &parent
+
+	attrs := make([]object.Attribute, len(e.parentAttributes))
+	for i := range e.parentAttributes {
+		attrs[i] = *e.parentAttributes[i].ToV2()
+	}
+	h.ParentAttributes = attrs
+
 	h.Index = e.index
 	h.Total = e.total
 	h.Header = e.header
@@ -60,6 +83,12 @@ func (e *ECHeader) ReadFromV2(h *object.ECHeader) error {
 		return errors.New("empty parent")
 	}
 
+	attrs := make([]Attribute, len(h.ParentAttributes))
+	for i := range h.ParentAttributes {
+		attrs[i] = *NewAttributeFromV2(&h.ParentAttributes[i])
+	}
+	e.parentAttributes = attrs
+
 	_ = e.parent.ReadFromV2(*h.Parent)
 	e.parentSplitID = NewSplitIDFromV2(h.ParentSplitID)
 	if h.ParentSplitParentID != nil {
@@ -123,6 +152,14 @@ func (e *ECHeader) SetParentSplitParentID(parentSplitParentID *oid.ID) {
 	e.parentSplitParentID = parentSplitParentID
 }
 
+func (e *ECHeader) ParentAttributes() []Attribute {
+	return e.parentAttributes
+}
+
+func (e *ECHeader) SetParentAttributes(attrs []Attribute) {
+	e.parentAttributes = attrs
+}
+
 func (e *ECHeader) Index() uint32 {
 	return e.index
 }