[389-devel] Re: Adding new syntaxes

> On 21 Mar 2020, at 01:37, thierry bordaz <tbordaz@redhat.com> wrote:
>
> Hi William,
>
> I only have a vague knowledge of syntaxes/MR.
>
> Each syntax is a plugin. Its init function registers for a given set of OIDs the matching rules (compare, order, substring) than handle that syntax (calls slapi_matchingrule_register).
> There is a special collation plugin that does the same for supported language.
> So a entryUUID syntax should define its matching rules callbacks and register them for supported OID.
>
> The MR are called during filter evaluation, both at candidate list built and at filter match.
> On write path, they are called to generate the index keys.
>
> I think there is a slight difference between syntaxes plugins and collation plugin in the way they are selected to apply for a given attribute.
> syntaxes provide the set of supported OIDs while for collation you need to call the index to know if it supports the OID.
>
> All of this are general ideas around syntax/MR and I think they are quite correct.

AHhhh, some of these things have helped me make sense of some of the plugin handle names and such. Thank you! I might put in a work-in-progress PR later of my work on entryuuid. :)

Thanks Thierry!



>
> best regards
> thierry
>
>
> On 3/20/20 4:37 AM, William Brown wrote:
>> Hi there,
>>
>> I'm looking to add the syntaxes to handle entryUUID properly, because they have a different format to nsUniqueId. Thinking that I need to look at the plugins under ldap/servers/plugins/syntaxes/, but it would be good to have some extra insight about the plugin hooks. Should I look at the old plugin guide? Or is there some extra info I can get from somewhere?
>>
>> Thanks!
>>
>> —
>> Sincerely,
>>
>> William Brown
>>
>> Senior Software Engineer, 389 Directory Server
>> SUSE Labs
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>

—
Sincerely,

William Brown

Senior Software Engineer, 389 Directory Server
SUSE Labs
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