gNMI get response parser fails on empty values

[tokarenko]

Describe the bug
gNMI get response parser fails on empty values, e.g.

{
  "openconfig-acl:acl": {
    "acl-sets": null
  }
}

Solution

The solution is to add VALUE_NOT_SET case to updateToNormalizedNode method in lighty-modules\lighty-gnmi\lighty-gnmi-sb\src\main\java\io\lighty\gnmi\southbound\mountpoint\codecs\GetResponseToNormalizedNodeCodec.java. I can't figure out how to do it with gson library used. I would be grateful if you could do it.

Workaround
In the meanwhile I applied the following workaround (last 3 lines):

    public Optional<NormalizedNode> apply(Gnmi.GetResponse response, YangInstanceIdentifier identifier)
            throws GnmiCodecException {
        for (Gnmi.Notification notification : response.getNotificationList()) {
            if (!notification.getUpdateList().isEmpty()) {
                // Json to NormalizedNode
                final var update = notification.getUpdateList().get(0);
                if (update.getVal().getValueCase() == Gnmi.TypedValue.ValueCase.VALUE_NOT_SET) {
                    return Optional.empty();
                }