Re: Allow non-superuser to cancel superuser tasks.

On Mon, 26 Feb 2024 at 20:10, Nathan Bossart <nathandbossart@gmail.com> wrote:

On Mon, Feb 26, 2024 at 12:38:40PM +0500, Kirill Reshke wrote:
> I see 2 possible ways to implement this. The first one is to have hool in
> pg_signal_backend, and define a hook in extension which can do the thing.
> The second one is to have a predefined role. Something like a
> `pg_signal_autovacuum` role which can signal running autovac to cancel. But
> I don't see how we can handle specific `application_name` with this
> solution.

pg_signal_autovacuum seems useful given commit 3a9b18b.

--
Nathan Bossart
Amazon Web Services: https://aws.amazon.com

Thank you for your response.

Please find a patch attached.

In patch, pg_signal_autovacuum role with oid 6312 added. I grabbed oid from unused_oids script output.

Also, tap tests for functionality added. I'm not sure where to place them, so I placed them in a separate directory in `src/test/`

Seems that regression tests for this feature are not possible, am i right?

Also, I was thinking of pg_signal_autovacuum vs pg_signal_backend. 

Should pg_signal_autovacuum have power of pg_signal_backend (implicity)? Or should this role have such little scope...