Re: [Anima] question about future-proofing of GRASP objectives
Brian E Carpenter <brian.e.carpenter@gmail.com> Sun, 13 December 2020 02:53 UTC
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To: Michael Richardson <mcr+ietf@sandelman.ca>, anima@ietf.org
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From: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Date: Sun, 13 Dec 2020 15:53:42 +1300
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Subject: Re: [Anima] question about future-proofing of GRASP objectives
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On 13-Dec-20 13:05, Michael Richardson wrote: > > GRASP objectives look like: > > objective = [objective-name, objective-flags, loop-count, ?objective-value] > objective-name = text ;see section "Format of Objective Options" > objective-flags = uint .bits objective-flag > loop-count = 0..255 > > so, ['string', uint, uint, otherstuff] > > There can be an array of objectives. Right, but only in an M_FLOOD message at present. Of course, we could in theory add other message formats with multiple objectives. > If any of the objectives do not match the above CDDL, what do I do? A related question was raised on the API draft by Ben Kaduk: how do we apply the (new) recommendations on CBOR validation in RFC8949? > Options are: > 1) throw away that objective and move on to the others, which maybe > look right? I would say that by the nature of M_FLOOD, that is the logically correct approach. > 2) throw away the entire message. > > (2) is certainly easier to code. Each objective is a self-contained CBOR array, so could be parsed quite independently of the others. [pause to glance at my code] However, I did do it the lazy way, i.e. the parsing loop exits on the first error. (If you look at my code, that's in the elif ... M_FLOOD case inside _parse_msg().) It would indeed be a little more work to skip the faulty objectives and process the valid ones. I probably should add that to my code since it would be useful for debugging. > (1) seems way more future proof. It depends on whether you prefer the Postel principle or draft-iab-use-it-or-lose-it. Regards Brian
- [Anima] question about future-proofing of GRASP o… Michael Richardson
- Re: [Anima] question about future-proofing of GRA… Brian E Carpenter
- Re: [Anima] question about future-proofing of GRA… Brian E Carpenter