Re: [netmod] augment YANG 1.0 with YANG 1.1 OK?

[Andy Bierman <[e-mail]>]

On Wed, Oct 18, 2017 at 7:36 AM, Juergen Schoenwaelder <
[e-mail]> wrote:

> On Sun, Oct 15, 2017 at 12:56:42PM -0700, Andy Bierman wrote:
> > > >
> > > >   augment "/if:interfaces-state/if:interface" {
> > > >     action reset {
> > > >       description "Reset this interface";
> > > >     }
> >
> > Can you spot the NMDA problem above?
> > Actually, it exists for in-line definitions, not just augment.
> >
> > Once you collapse the interfaces-state tree into /interfaces, there
> > is no way to specify whether an action is intended for <operational>
> > or a configuration datastore, or all datastores.
>
> I think operations (both RPCs and actions) by default always execute
> in the context of the operational state datastore. This is consistent
> with the way we define the xpath context. An operation that operates
> on other datastores needs to carry this information in its semantics
> and typically requires special arguments to select the datastores
> affected. This is how <get-config> and <edit-config> work. Hence, a
> reset action defined for an interface by default applies to the
> operational state datastore. And this default makes likely sense for
> most actions and RPCs.
>


OK -- seems correct


>
> If an action or RPC is expected to operate on a different datastore,
> the description must explain this and there may be a need to pass a
> datastore identifier to the operation. [Yes, in retrospect, one might
> have designed the protocol differently so that there would always be a
> datastore parameter at the protocol level but its too late for that.]
>
>

 A top-level RPC can also be used if a datastore parameter is needed,
or an <action2> wrapper can be defined.

The draft should be clear that the ability to invoke an action (within
a config=true parent data node) is removed. This is under-specified
in YANG so it is not really breaking anything.


/js
>

Andy


>
> --
> Juergen Schoenwaelder           Jacobs University Bremen gGmbH
> Phone: [phone]         Campus Ring 1 | 28759 Bremen | Germany
> Fax:   [phone]         <http://www.jacobs-university.de/>
>