Re: [Netconf] [yang-doctors] YANG Doctor question: empty mandatory choice?
"Eric Voit (evoit)" <evoit@cisco.com> Tue, 31 July 2018 19:39 UTC
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From: "Eric Voit (evoit)" <evoit@cisco.com>
To: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>, Martin Bjorklund <mbj@tail-f.com>, "Andy Bierman (andy@yumaworks.com)" <andy@yumaworks.com>
CC: "yang-doctors@ietf.org" <yang-doctors@ietf.org>, "netconf@ietf.org" <netconf@ietf.org>
Thread-Topic: [yang-doctors] YANG Doctor question: empty mandatory choice?
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Date: Tue, 31 Jul 2018 19:39:18 +0000
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Subject: Re: [Netconf] [yang-doctors] YANG Doctor question: empty mandatory choice?
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> From: Juergen Schoenwaelder, July 31, 2018 1:48 PM > > On Mon, Jul 30, 2018 at 08:41:42PM +0200, Martin Bjorklund wrote: > > > > The empty mandatory choice does provide value since it requires that > > some transport-specific parameters are configured. However, can we > > assume that all transports require configuration parameters here? > > Can you have a receiver without any transport parameters? > > > It is probably safest to not have a mandatory choice, and instead > > ensure that each transport augements the proper params -- and since > > this is YANG 1.1, the transport params that are augmented can actually > > be marked as mandatory. > > Frankly, an empty mandatory choice quite clearly says "this is incomplete and > unusable without an augmentation". My read above is the YANG doctor's position is that we should *not* use the empty mandatory choice. Let me know if I got this wrong. That would mean that each transport document supporting configured subscriptions would then augment transport specific parameters to "/subscriptions/subscription/receivers/receiver". And (assuming the "single transport" decision of IETF100 isn't changed), that the identity "transport" could be leveraged to enforce that only a single transport specific set of credentials are associated with a receiver. A sample YANG augmentation for NETCONF would then look like: module ietf-netconf-subscribed-notifications { prefix nsn; import ietf-netconf-client { prefix ncc; } import ietf-subscribed-notifications { prefix sn; } identity netconf { base sn:transport; base sn:inline-address; description "NETCONF is used as a transport for notification messages and state change notifications."; } augment "/sn:subscriptions/sn:subscription/sn:receivers/sn:receiver" { when 'derived-from(../../../transport, "nsn:netconf")'; description "This augmentation allows NETCONF specific parameters to be exposed for a receiver."; leaf netconf-endpoint { type leafref { path "/ncc:netconf-client/ncc:initiate/ncc:netconf-server" + "/ncc:endpoints/ncc:endpoint/ncc:name"; } mandatory true; description "Remote client which need to initiate the NETCONF transport if an existing NETCONF session from that client is not available."; } } } Which results in: +--rw subscriptions +--rw subscription* +--rw transport transport {configured}? +--rw receivers +--rw receiver* +--rw nsn:netconf-endpoint leafref Eric > /js > > -- > Juergen Schoenwaelder Jacobs University Bremen gGmbH > Phone: +49 421 200 3587 Campus Ring 1 | 28759 Bremen | Germany > Fax: +49 421 200 3103 <https://www.jacobs-university.de/>
- Re: [Netconf] [yang-doctors] YANG Doctor question… Andy Bierman
- Re: [Netconf] YANG Doctor question: empty mandato… Kent Watsen
- Re: [Netconf] YANG Doctor question: empty mandato… Andy Bierman
- Re: [Netconf] [yang-doctors] YANG Doctor question… Robert Wilton
- Re: [Netconf] [yang-doctors] YANG Doctor question… Andy Bierman
- Re: [Netconf] YANG Doctor question: empty mandato… Eric Voit (evoit)
- Re: [Netconf] [yang-doctors] YANG Doctor question… Robert Wilton
- Re: [Netconf] [yang-doctors] YANG Doctor question… Eric Voit (evoit)
- Re: [Netconf] [yang-doctors] YANG Doctor question… Andy Bierman
- [Netconf] YANG Doctor question: empty mandatory c… Eric Voit (evoit)
- Re: [Netconf] [yang-doctors] YANG Doctor question… Juergen Schoenwaelder
- Re: [Netconf] [yang-doctors] YANG Doctor question… Kent Watsen
- Re: [Netconf] [yang-doctors] YANG Doctor question… Eric Voit (evoit)
- Re: [Netconf] [yang-doctors] YANG Doctor question… Juergen Schoenwaelder
- Re: [Netconf] [yang-doctors] YANG Doctor question… Juergen Schoenwaelder
- Re: [Netconf] [yang-doctors] YANG Doctor question… Robert Wilton
- Re: [Netconf] [yang-doctors] YANG Doctor question… Robert Wilton
- Re: [Netconf] [yang-doctors] YANG Doctor question… Eric Voit (evoit)
- Re: [Netconf] [yang-doctors] YANG Doctor question… Juergen Schoenwaelder
- Re: [Netconf] [yang-doctors] YANG Doctor question… Eric Voit (evoit)
- Re: [Netconf] [yang-doctors] YANG Doctor question… Juergen Schoenwaelder
- Re: [Netconf] [yang-doctors] YANG Doctor question… Eric Voit (evoit)
- Re: [Netconf] [yang-doctors] YANG Doctor question… Eric Voit (evoit)
- Re: [Netconf] [yang-doctors] YANG Doctor question… Andy Bierman
- Re: [Netconf] [yang-doctors] YANG Doctor question… Kent Watsen
- Re: [Netconf] [yang-doctors] YANG Doctor question… Andy Bierman
- Re: [Netconf] [yang-doctors] YANG Doctor question… Eric Voit (evoit)
- Re: [Netconf] [yang-doctors] YANG Doctor question… Martin Bjorklund
- Re: [Netconf] [yang-doctors] YANG Doctor question… Martin Bjorklund
- Re: [Netconf] [yang-doctors] YANG Doctor question… Martin Bjorklund
- Re: [Netconf] [yang-doctors] YANG Doctor question… Eric Voit (evoit)
- Re: [Netconf] [yang-doctors] YANG Doctor question… Kent Watsen
- Re: [Netconf] [yang-doctors] YANG Doctor question… Martin Bjorklund
- Re: [Netconf] [yang-doctors] YANG Doctor question… Martin Bjorklund
- Re: [Netconf] YANG Doctor question: empty mandato… Kent Watsen
- Re: [Netconf] YANG Doctor question: empty mandato… Kent Watsen
- Re: [Netconf] YANG Doctor question: empty mandato… Martin Bjorklund
- Re: [Netconf] [yang-doctors] YANG Doctor question… Juergen Schoenwaelder
- Re: [Netconf] YANG Doctor question: empty mandato… Juergen Schoenwaelder
- Re: [Netconf] YANG Doctor question: empty mandato… Alexander Clemm
- Re: [Netconf] [yang-doctors] YANG Doctor question… Martin Bjorklund
- Re: [Netconf] [yang-doctors] YANG Doctor question… Eric Voit (evoit)
- Re: [Netconf] [yang-doctors] YANG Doctor question… Andy Bierman
- Re: [Netconf] [yang-doctors] YANG Doctor question… Kent Watsen
- Re: [Netconf] [yang-doctors] YANG Doctor question… Andy Bierman
- Re: [Netconf] [yang-doctors] YANG Doctor question… Robert Wilton
- Re: [Netconf] [yang-doctors] YANG Doctor question… Eric Voit (evoit)
- Re: [Netconf] YANG Doctor question: empty mandato… Kent Watsen
- Re: [Netconf] YANG Doctor question: empty mandato… Andy Bierman
- Re: [Netconf] YANG Doctor question: empty mandato… Einar Nilsen-Nygaard (einarnn)
- Re: [Netconf] YANG Doctor question: empty mandato… Einar Nilsen-Nygaard (einarnn)
- Re: [Netconf] YANG Doctor question: empty mandato… Henk Birkholz
- Re: [Netconf] YANG Doctor question: empty mandato… Andy Bierman
- Re: [Netconf] YANG Doctor question: empty mandato… Andy Bierman
- Re: [Netconf] YANG Doctor question: empty mandato… Kent Watsen
- Re: [Netconf] YANG Doctor question: empty mandato… Eric Voit (evoit)
- Re: [Netconf] [yang-doctors] YANG Doctor question… Martin Bjorklund
- Re: [Netconf] YANG Doctor question: empty mandato… Martin Bjorklund
- Re: [Netconf] [yang-doctors] YANG Doctor question… Kent Watsen
- Re: [Netconf] [yang-doctors] YANG Doctor question… Martin Bjorklund
- Re: [Netconf] [yang-doctors] YANG Doctor question… tom petch
- Re: [Netconf] [yang-doctors] YANG Doctor question… Kent Watsen
- Re: [Netconf] [yang-doctors] YANG Doctor question… Kent Watsen
- Re: [Netconf] [yang-doctors] YANG Doctor question… Eric Voit (evoit)
- Re: [Netconf] [yang-doctors] YANG Doctor question… Martin Bjorklund
- Re: [Netconf] [yang-doctors] YANG Doctor question… Kent Watsen
- Re: [Netconf] [yang-doctors] YANG Doctor question… Eric Voit (evoit)
- Re: [Netconf] [yang-doctors] YANG Doctor question… Martin Bjorklund