Re: On login trigger: take three

From: Konstantin Knizhnik <k(dot)knizhnik(at)postgrespro(dot)ru>
To: Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>
Cc: Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>, Greg Nancarrow <gregn4422(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: On login trigger: take three
Date: 2021-01-28 09:04:28
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On 28.01.2021 5:47, Amit Kapila wrote:
> On Mon, Dec 28, 2020 at 5:46 PM Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com> wrote:
>> On Sat, Dec 26, 2020 at 4:04 PM Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> wrote:
>>> so 26. 12. 2020 v 8:00 odesílatel Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> napsal:
>>>> Hi
>>>>> Thank you.
>>>>> I have applied all your fixes in on_connect_event_trigger-12.patch.
>>>>> Concerning enable_client_connection_trigger GUC, I think that it is really useful: it is the fastest and simplest way to disable login triggers in case
>>>>> of some problems with them (not only for superuser itself, but for all users). Yes, it can be also done using "ALTER EVENT TRIGGER DISABLE".
>>>>> But assume that you have a lot of databases with different login policies enforced by on-login event triggers. And you want temporary disable them all, for example for testing purposes.
>>>>> In this case GUC is most convenient way to do it.
>>>> There was typo in patch
>>>> diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
>>>> index f810789..8861f1b 100644
>>>> --- a/doc/src/sgml/config.sgml
>>>> +++ b/doc/src/sgml/config.sgml
>>>> @@ -1,4 +1,4 @@
>>>> -<!-- doc/src/sgml/config.sgml -->
>>>> +\<!-- doc/src/sgml/config.sgml -->
>>>> I have not any objections against functionality or design. I tested the performance, and there are no negative impacts when this feature is not used. There is significant overhead related to plpgsql runtime initialization, but when this trigger will be used, then probably some other PLpgSQL procedures and functions will be used too, and then this overhead can be ignored.
>>>> * make without warnings
>>>> * make check-world passed
>>>> * doc build passed
>>>> Possible ToDo:
>>>> The documentation can contain a note so usage connect triggers in environments with short life sessions and very short fast queries without usage PLpgSQL functions or procedures can have negative impact on performance due overhead of initialization of PLpgSQL engine.
>>>> I'll mark this patch as ready for committers
>>> looks so this patch has not entry in commitfestapp 2021-01
>> Yeah, please register this patch before the next CommitFest[1] starts,
>> 2021-01-01 AoE[2].
> Konstantin, did you register this patch in any CF? Even though the
> reviewer seems to be happy with the patch, I am afraid that we might
> lose track of this unless we register it.
Yes, certainly:

Konstantin Knizhnik
Postgres Professional:
The Russian Postgres Company

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