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Re: [netconf] Trouble with RFC 8040 (Restconf) fields Query Parameter

Mahesh Jethanandani <mjethanandani@gmail.com> Fri, 08 May 2020 18:07 UTC

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From: Mahesh Jethanandani <mjethanandani@gmail.com>
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Date: Fri, 08 May 2020 11:07:35 -0700
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Cc: Martin Björklund <mbj+ietf@4668.se>, netconf@ietf.org
To: Henning Rogge <hrogge@gmail.com>
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Subject: Re: [netconf] Trouble with RFC 8040 (Restconf) fields Query Parameter
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Hi Henning,

> On May 7, 2020, at 10:18 PM, Henning Rogge <hrogge@gmail.com> wrote:
> 
> On Thu, May 7, 2020 at 10:33 PM Mahesh Jethanandani
> <mjethanandani@gmail.com> wrote:
>> 
>> Hi Henning,
>> While not IETF blessed, ODL ran into multiple issues with the fields query parameter, and documented in this Jira report. Documented in there are some of the test cases that might interest you to run. There were other test cases run in this and this report also that should be of interest.
> 
> Thank you very much for these links...
> 
> hmm, when reading through them I noticed something... is
> fields=uuid;actual-equipment(manufactured-thing(equipment-type);structure)
> even valid?
> 
> According to the RFC8040 4.8.3. the bracket part of the expression can
> only nest in the last of the fields...
> 
> 'path ; fields-expr', but not 'fields-expr ; path”

I will let one of the authors comment on what the intent was.

> 
> What do you think ? I guess this was don to prevent a whole tree of
> field subexpressions... the ABNF does only seem to support a "line" of
> them.

The implementation in ODL does not care what order the query is placed in. Even if the bracket part of the query is placed in the last field, when it builds up the hash index for the search, the bracketed parts can appear anywhere based on how it gets hashed.

Cheers.

> 
> Henning Rogge

Mahesh Jethanandani
mjethanandani@gmail.com

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