[#168] session: Implement binary/JSON encoders/decoders on RequestMeta

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

v2/session/json.go

@@ -104,3 +104,23 @@ func (x *XHeader) UnmarshalJSON(data []byte) error {
 
 	return nil
 }
+
+func (r *RequestMetaHeader) MarshalJSON() ([]byte, error) {
+	return protojson.MarshalOptions{
+		EmitUnpopulated: true,
+	}.Marshal(
+		RequestMetaHeaderToGRPCMessage(r),
+	)
+}
+
+func (r *RequestMetaHeader) UnmarshalJSON(data []byte) error {
+	msg := new(session.RequestMetaHeader)
+
+	if err := protojson.Unmarshal(data, msg); err != nil {
+		return err
+	}
+
+	*r = *RequestMetaHeaderFromGRPCMessage(msg)
+
+	return nil
+}

v2/session/json_test.go

@@ -66,3 +66,15 @@ func TestXHeaderJSON(t *testing.T) {
 
 	require.Equal(t, x, x2)
 }
+
+func TestRequestMetaHeaderJSON(t *testing.T) {
+	r := generateRequestMetaHeader(1, "bearer", "session")
+
+	data, err := r.MarshalJSON()
+	require.NoError(t, err)
+
+	r2 := new(session.RequestMetaHeader)
+	require.NoError(t, r2.UnmarshalJSON(data))
+
+	require.Equal(t, r, r2)
+}

v2/session/marshal.go

@@ -528,6 +528,17 @@ func (r *RequestMetaHeader) StableSize() (size int) {
 	return size
 }
 
+func (r *RequestMetaHeader) Unmarshal(data []byte) error {
+	m := new(session.RequestMetaHeader)
+	if err := goproto.Unmarshal(data, m); err != nil {
+		return err
+	}
+
+	*r = *RequestMetaHeaderFromGRPCMessage(m)
+
+	return nil
+}
+
 func (r *RequestVerificationHeader) StableMarshal(buf []byte) ([]byte, error) {
 	if r == nil {
 		return []byte{}, nil

v2/session/marshal_test.go

@@ -118,16 +118,14 @@ func TestRequestMetaHeader_StableMarshal(t *testing.T) {
 	metaHeaderOrigin := generateRequestMetaHeader(10, "Bearer One", "Session One")
 	metaHeaderFrom := generateRequestMetaHeader(20, "Bearer Two", "Session Two")
 	metaHeaderFrom.SetOrigin(metaHeaderOrigin)
-	transport := new(grpc.RequestMetaHeader)
 
 	t.Run("non empty", func(t *testing.T) {
 		wire, err := metaHeaderFrom.StableMarshal(nil)
 		require.NoError(t, err)
 
-		err = goproto.Unmarshal(wire, transport)
-		require.NoError(t, err)
+		metaHeaderTo := new(session.RequestMetaHeader)
+		require.NoError(t, metaHeaderTo.Unmarshal(wire))
 
-		metaHeaderTo := session.RequestMetaHeaderFromGRPCMessage(transport)
 		require.Equal(t, metaHeaderFrom, metaHeaderTo)
 	})
 }