[#259] netmap: Implement JSON encoding for NetworkInfo RPC messages

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

v2/netmap/json.go

@@ -124,3 +124,23 @@ func (ni *NodeInfo) UnmarshalJSON(data []byte) error {
 
 	return nil
 }
+
+func (i *NetworkInfo) MarshalJSON() ([]byte, error) {
+	return protojson.MarshalOptions{
+		EmitUnpopulated: true,
+	}.Marshal(
+		NetworkInfoToGRPCMessage(i),
+	)
+}
+
+func (i *NetworkInfo) UnmarshalJSON(data []byte) error {
+	msg := new(netmap.NetworkInfo)
+
+	if err := protojson.Unmarshal(data, msg); err != nil {
+		return err
+	}
+
+	*i = *NetworkInfoFromGRPCMessage(msg)
+
+	return nil
+}

v2/netmap/json_test.go

@@ -66,3 +66,15 @@ func TestNodeInfoJSON(t *testing.T) {
 
 	require.Equal(t, i, i2)
 }
+
+func TestNetworkInfoJSON(t *testing.T) {
+	i := generateNetworkInfo()
+
+	data, err := i.MarshalJSON()
+	require.NoError(t, err)
+
+	i2 := new(netmap.NetworkInfo)
+	require.NoError(t, i2.UnmarshalJSON(data))
+
+	require.Equal(t, i, i2)
+}