Re: [yang-doctors] Identities vs enums
Ladislav Lhotka <lhotka@nic.cz> Thu, 29 August 2019 12:33 UTC
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From: Ladislav Lhotka <lhotka@nic.cz>
To: Martin Bjorklund <mbj@tail-f.com>
Cc: yang-doctors@ietf.org
Date: Thu, 29 Aug 2019 14:33:31 +0200
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Subject: Re: [yang-doctors] Identities vs enums
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On Thu, 2019-08-29 at 14:13 +0200, Martin Bjorklund wrote: > Ladislav Lhotka <lhotka@nic.cz> wrote: > > On Thu, 2019-08-29 at 10:24 +0000, Rob Wilton (rwilton) wrote: > > > > I doubt that this is the first time that this has come up … > > > > > > > > draft-ietf-netmod-intf-ext-yang-07, defines 3 identities (along with a > base > > > > identity) for loopback configuration: “loopback-internal”, “loopback-line” > and > > > > “loopback-connector”. > > > > > > > > One of the reviewers is complaining that the “loopback-“ prefix in the > > > > identity is redundant and noisy. I.e. he doesn’t like having to write > > > > loopback=’loopback-internal’, and would like to be able to write > > > > loopback=’internal’ instead. > > > > > > > > His main suggestion is to move these loopback (or perhaps just the > identities) > > > > to a separate YANG module so that they don’t need to define a “loopback-“ > > > > prefix. > > > > > > > > There seem to be some choices here: > > > > (1) Keep with identities with a "loopback-" prefix. This causes > > > > loopback='loopback-internal' > > > > (2) Keep with identities, but loose the common prefix, i.e. the identities > > > > become "internal", "line", "connector". Given the size of the module, the > > > > likelihood of an identity naming clash in future seems quite small, but > they > > > > are somewhat generic terms. > > > > (3) Use shorter identity names, but also put them in a separate types > module > > > > (as requested by the reviewer). > > > > (4) Use an enum rather than identities. Although this has the potential > issue > > > > that the enum cannot be extended (which I’m wondering if this is something > > > > that we should consider changing in the hypothetical YANG Next). > > > > > > I would go for (2). > > > +1 (provided you really need the flexibility!) > > > In fact, the namespace for identity names probably needn't be module-wide, I > > > think it would be perfectly fine to require unique names only for identities > > > derived from the same base. > > > Yes that would have worked as well. But it would have a big impact on > implementations that use the fact that they are unique... Yes, although I think the required changes shouldn't be too big. On the other hand, it would be backward compatible in terms of existing modules. Lada > > > /martin > > > > > > > > Lada > > > > > > > > > > > Personally, I’m toying with changing to 4 or perhaps 2. I’m not keen on > 3. > > > > > > > > Any thoughts or opinions from the YANG doctors? > > > > > > > > Thanks, > > > > Rob > > > > > > > > _______________________________________________ > > > > yang-doctors mailing list > > > > yang-doctors@ietf.org > > > > https://www.ietf.org/mailman/listinfo/yang-doctors > > > -- > > > Ladislav Lhotka > > > Head, CZ.NIC Labs > > > PGP Key ID: 0xB8F92B08A9F76C67 > > > > > > _______________________________________________ > > > yang-doctors mailing list > > > yang-doctors@ietf.org > > > https://www.ietf.org/mailman/listinfo/yang-doctors > -- Ladislav Lhotka Head, CZ.NIC Labs PGP Key ID: 0xB8F92B08A9F76C67
- [yang-doctors] Identities vs enums Rob Wilton (rwilton)
- Re: [yang-doctors] Identities vs enums Juergen Schoenwaelder
- Re: [yang-doctors] Identities vs enums Martin Bjorklund
- Re: [yang-doctors] Identities vs enums Ladislav Lhotka
- Re: [yang-doctors] Identities vs enums Rob Wilton (rwilton)
- Re: [yang-doctors] Identities vs enums Martin Bjorklund
- Re: [yang-doctors] Identities vs enums Ladislav Lhotka
- Re: [yang-doctors] Identities vs enums Reshad Rahman (rrahman)
- Re: [yang-doctors] Identities vs enums Rob Wilton (rwilton)