[#168] refs: Implement binary/JSON encoders/decoders on ContainerID

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

pkg/container/id.go

@@ -65,3 +65,35 @@ func (id *ID) Parse(s string) error {
 func (id *ID) String() string {
 	return base58.Encode((*refs.ContainerID)(id).GetValue())
 }
+
+// Marshal marshals ID into a protobuf binary form.
+//
+// Buffer is allocated when the argument is empty.
+// Otherwise, the first buffer is used.
+func (id *ID) Marshal(b ...[]byte) ([]byte, error) {
+	var buf []byte
+	if len(b) > 0 {
+		buf = b[0]
+	}
+
+	return (*refs.ContainerID)(id).
+		StableMarshal(buf)
+}
+
+// Unmarshal unmarshals protobuf binary representation of ID.
+func (id *ID) Unmarshal(data []byte) error {
+	return (*refs.ContainerID)(id).
+		Unmarshal(data)
+}
+
+// MarshalJSON encodes ID to protobuf JSON format.
+func (id *ID) MarshalJSON() ([]byte, error) {
+	return (*refs.ContainerID)(id).
+		MarshalJSON()
+}
+
+// UnmarshalJSON decodes ID from protobuf JSON format.
+func (id *ID) UnmarshalJSON(data []byte) error {
+	return (*refs.ContainerID)(id).
+		UnmarshalJSON(data)
+}

pkg/container/id_test.go

@@ -90,3 +90,28 @@ func TestID_String(t *testing.T) {
 		}
 	})
 }
+
+func TestContainerIDEncoding(t *testing.T) {
+	id := NewID()
+	id.SetSHA256(randSHA256Checksum(t))
+
+	t.Run("binary", func(t *testing.T) {
+		data, err := id.Marshal()
+		require.NoError(t, err)
+
+		id2 := NewID()
+		require.NoError(t, id2.Unmarshal(data))
+
+		require.Equal(t, id, id2)
+	})
+
+	t.Run("json", func(t *testing.T) {
+		data, err := id.MarshalJSON()
+		require.NoError(t, err)
+
+		a2 := NewID()
+		require.NoError(t, a2.UnmarshalJSON(data))
+
+		require.Equal(t, id, a2)
+	})
+}