[Koha-bugs] [Bug 15032] [Plack] Scripts that fork (like stage-marc-import.pl) don't work as expected

[bugzilla-daemon at bugs.koha-community.org]

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=15032

--- Comment #30 from David Cook <dcook at prosentient.com.au> ---
(In reply to Jonathan Druart from comment #26)
> I do not think your Koha::Daemon will work for the background jobs.
> 
> To me, the best way to fix this would be to provide a Koha daemon, instead.
> But it would watch a DB table, which would allow us to build a view on top
> of it to manage the different jobs (and history).
> 
> We could also have different daemons for different needs (a param of the
> daemon matching a column in the DB table).
> 
> The question behind that is security, we will have to list the different
> operations the daemon is allowed to process (and so we will loose
> flexibility).
> 
> I have spent a *lot* of time trying to fix this issue by forking, etc. And
> my conclusion is: it's not feasible (see discussions and tries on related
> bug reports)
> 
> See also bug 1993.

My Koha::Daemon is just a module for making a daemon process; it's similar to
Proc::Daemon on CPAN.

But yeah I could see my Koha::OAI::Harvester::Listener and Koha::OAI::Harvester
not working for all background jobs. They work well in my case but I'd be happy
to actually replace (elements of) them with a more general Koha solution, if it
worked for my use case too.

Yeah I think that different daemons for different needs makes sense too. Like
in the case of #10662, I originally wrote a generic job server, but then
realized it might not suit everyone, so I re-wrote it just for that specific
task of harvesting OAI-PMH records. 

Yeah, I don't think forking makes sense in a Plack/persistent environment.
Actually, I don't think it makes sense in the CGI environment either, but it
"worked". Setting up separate daemons is easy. I don't know why we don't just
do that. The issue then I suppose is security, as you've said, and deciding on
communication protocols.

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