On 8/21/20 6:30 PM, Stephen Hemminger wrote:
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On Fri, 21 Aug 2020 14:09:14 -0700
Roopa Prabhu <ro...@nvidia.com> wrote:

On 8/20/20 10:18 PM, Roopa Prabhu wrote:
On 8/20/20 9:36 PM, Stephen Hemminger wrote:

On Thu, 20 Aug 2020 20:52:02 -0700
Roopa Prabhu <ro...@cumulusnetworks.com> wrote:

+     if (tb[IFLA_PROTO_DOWN]) {
+             if (rta_getattr_u8(tb[IFLA_PROTO_DOWN]))
+                     print_bool(PRINT_ANY,
+                                "proto_down", " protodown on ", true);
In general my preference is to use print_null() for presence flags.
Otherwise you have to handle the false case in JSON as a special case.

ok, i will look. But this is existing code moved into a new function and
has been

working fine for years.

looked at print_null and switching to that results in a change in output
for existing protodown

attribute, so I plan to leave it as is for now.

Sure we should really try and have some consistency in the JSON output.
Maybe a JSON style guide is needed, I wonder if some heavy JSON user already
has one?

yes, agreed. I think we need to checkin a guide for coders and reviewers. specifically for the iproute2 json library.

Its hard to catch these at review time otherwise and most of iproute2 bugs are propagated due to copy-paste.

I checked if the FRR project had one as they have a lot of json routing operational data. They don't and  rely on reviewers.

In the least i think the json library api documentation and a few best practices will help.

thanks for the review.

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