[#253] container: Implement marshalers on UsedSpaceAnnouncement structure

Implement Unmarshal method on UsedSpaceAnnouncement v2 message. Implement
Marshal/Unmarshal methods on cross-version UsedSpaceAnnouncement type.

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

pkg/container/announcement.go

@@ -55,3 +55,23 @@ func (a *UsedSpaceAnnouncement) SetUsedSpace(value uint64) {
 func (a *UsedSpaceAnnouncement) ToV2() *container.UsedSpaceAnnouncement {
 	return (*container.UsedSpaceAnnouncement)(a)
 }
+
+// Marshal marshals UsedSpaceAnnouncement into a protobuf binary form.
+//
+// Buffer is allocated when the argument is empty.
+// Otherwise, the first buffer is used.
+func (a *UsedSpaceAnnouncement) Marshal(b ...[]byte) ([]byte, error) {
+	var buf []byte
+	if len(b) > 0 {
+		buf = b[0]
+	}
+
+	return a.ToV2().
+		StableMarshal(buf)
+}
+
+// Unmarshal unmarshals protobuf binary representation of UsedSpaceAnnouncement.
+func (a *UsedSpaceAnnouncement) Unmarshal(data []byte) error {
+	return a.ToV2().
+		Unmarshal(data)
+}

pkg/container/announcement_test.go

@@ -1,6 +1,7 @@
 package container_test
 
 import (
+	"crypto/sha256"
 	"testing"
 
 	"github.com/nspcc-dev/neofs-api-go/pkg/container"
@@ -47,3 +48,24 @@ func TestAnnouncement(t *testing.T) {
 		require.Equal(t, container.NewIDFromV2(newCID), newA.ContainerID())
 	})
 }
+
+func TestUsedSpaceEncoding(t *testing.T) {
+	a := container.NewAnnouncement()
+	a.SetUsedSpace(13)
+	a.SetEpoch(666)
+
+	id := container.NewID()
+	id.SetSHA256([sha256.Size]byte{1, 2, 3})
+
+	a.SetContainerID(id)
+
+	t.Run("binary", func(t *testing.T) {
+		data, err := a.Marshal()
+		require.NoError(t, err)
+
+		a2 := container.NewAnnouncement()
+		require.NoError(t, a2.Unmarshal(data))
+
+		require.Equal(t, a, a2)
+	})
+}

v2/container/marshal.go

@@ -589,6 +589,17 @@ func (a *UsedSpaceAnnouncement) StableSize() (size int) {
 	return size
 }
 
+func (a *UsedSpaceAnnouncement) Unmarshal(data []byte) error {
+	m := new(container.AnnounceUsedSpaceRequest_Body_Announcement)
+	if err := proto.Unmarshal(data, m); err != nil {
+		return err
+	}
+
+	*a = *UsedSpaceAnnouncementFromGRPCMessage(m)
+
+	return nil
+}
+
 func (r *AnnounceUsedSpaceRequestBody) StableMarshal(buf []byte) ([]byte, error) {
 	if r == nil {
 		return []byte{}, nil

v2/container/marshal_test.go

@@ -234,6 +234,22 @@ func TestGetEACLResponseBody_StableMarshal(t *testing.T) {
 	})
 }
 
+func TestUsedSpaceAnnouncement_StableMarshal(t *testing.T) {
+	from := generateAnnouncement()
+	transport := new(grpc.AnnounceUsedSpaceRequest_Body_Announcement)
+
+	t.Run("non empty", func(t *testing.T) {
+		wire, err := from.StableMarshal(nil)
+		require.NoError(t, err)
+
+		err = goproto.Unmarshal(wire, transport)
+		require.NoError(t, err)
+
+		to := container.UsedSpaceAnnouncementFromGRPCMessage(transport)
+		require.Equal(t, from, to)
+	})
+}
+
 func TestAnnounceUsedSpaceRequestBody_StableMarshal(t *testing.T) {
 	requestFrom := generateAnnounceRequestBody(10)
 	transport := new(grpc.AnnounceUsedSpaceRequest_Body)
@@ -443,21 +459,27 @@ func generateGetEACLResponseBody(n int, k, v string) *container.GetExtendedACLRe
 	return resp
 }
 
+func generateAnnouncement() *container.UsedSpaceAnnouncement {
+	buf := make([]byte, sha256.Size)
+	rand.Read(buf)
+
+	cid := new(refs.ContainerID)
+	cid.SetValue(buf)
+
+	a := new(container.UsedSpaceAnnouncement)
+	a.SetEpoch(rand.Uint64())
+	a.SetContainerID(cid)
+	a.SetUsedSpace(rand.Uint64())
+
+	return a
+}
+
 func generateAnnounceRequestBody(n int) *container.AnnounceUsedSpaceRequestBody {
 	resp := new(container.AnnounceUsedSpaceRequestBody)
-	buf := make([]byte, sha256.Size)
 
 	announcements := make([]*container.UsedSpaceAnnouncement, 0, n)
 	for i := 0; i < n; i++ {
-		rand.Read(buf)
+		announcements = append(announcements, generateAnnouncement())
-
-		cid := new(refs.ContainerID)
-		cid.SetValue(buf)
-
-		a := new(container.UsedSpaceAnnouncement)
-		a.SetEpoch(rand.Uint64())
-		a.SetContainerID(cid)
-		a.SetUsedSpace(rand.Uint64())
 	}
 
 	resp.SetAnnouncements(announcements)