[#129] v2: Add unified structure for NodeInfo

Signed-off-by: Alex Vanin <alexey@nspcc.ru>

v2/netmap/marshal.go

@@ -1,5 +1,18 @@
 package netmap
 
+import (
+	"github.com/nspcc-dev/neofs-api-go/util/proto"
+)
+
+const (
+	keyAttributeField   = 1
+	valueAttributeField = 2
+
+	keyNodeInfoField        = 1
+	addressNodeInfoField    = 2
+	attributesNodeInfoField = 3
+)
+
 func (p *PlacementPolicy) StableMarshal(buf []byte) ([]byte, error) {
 	// todo: implement me
 	return nil, nil
@@ -9,3 +22,97 @@ func (p *PlacementPolicy) StableSize() (size int) {
 	// todo: implement me
 	return 0
 }
+
+func (a *Attribute) StableMarshal(buf []byte) ([]byte, error) {
+	if a == nil {
+		return []byte{}, nil
+	}
+
+	if buf == nil {
+		buf = make([]byte, a.StableSize())
+	}
+
+	var (
+		offset, n int
+		err       error
+	)
+
+	n, err = proto.StringMarshal(keyAttributeField, buf[offset:], a.key)
+	if err != nil {
+		return nil, err
+	}
+
+	offset += n
+
+	n, err = proto.StringMarshal(valueAttributeField, buf[offset:], a.value)
+	if err != nil {
+		return nil, err
+	}
+
+	return buf, nil
+}
+
+func (a *Attribute) StableSize() (size int) {
+	if a == nil {
+		return 0
+	}
+
+	size += proto.StringSize(keyAttributeField, a.key)
+	size += proto.StringSize(valueAttributeField, a.value)
+
+	return size
+}
+
+func (ni *NodeInfo) StableMarshal(buf []byte) ([]byte, error) {
+	if ni == nil {
+		return []byte{}, nil
+	}
+
+	if buf == nil {
+		buf = make([]byte, ni.StableSize())
+	}
+
+	var (
+		offset, n int
+		err       error
+	)
+
+	n, err = proto.BytesMarshal(keyNodeInfoField, buf[offset:], ni.publicKey)
+	if err != nil {
+		return nil, err
+	}
+
+	offset += n
+
+	n, err = proto.StringMarshal(addressNodeInfoField, buf[offset:], ni.address)
+	if err != nil {
+		return nil, err
+	}
+
+	offset += n
+
+	for i := range ni.attributes {
+		n, err = proto.NestedStructureMarshal(attributesNodeInfoField, buf[offset:], ni.attributes[i])
+		if err != nil {
+			return nil, err
+		}
+
+		offset += n
+	}
+
+	return buf, nil
+}
+
+func (ni *NodeInfo) StableSize() (size int) {
+	if ni == nil {
+		return 0
+	}
+
+	size += proto.BytesSize(keyNodeInfoField, ni.publicKey)
+	size += proto.StringSize(addressNodeInfoField, ni.address)
+	for i := range ni.attributes {
+		size += proto.NestedStructureSize(attributesNodeInfoField, ni.attributes[i])
+	}
+
+	return size
+}