[SR-Users] Kill child process created by app_python module

[Marat Gareev]

Hello,

thanks for recommending module *evrexec*.

The problem was solved in the following way

KEMI script:
class kamailio:
def update(self, msg):
while True:
_action()
time.sleep(60)

def mod_init():
return kamailio()

Kamailio script:
loadmodule "evrexec"
modparam("evrexec", "exec", "name=evrexec:update;workers=1;")

...

event_route[evrexec:update] {
if (!python_exec("update")) {
xlog("L_CRITICAL", "Couldn't start update process\n");
}
}

thus the process is registered in kamailio and works correctly.

чт, 27 окт. 2022 г. в 11:21, Henning Westerholt <hw at gilawa.com>:

> Hello,
>
>
>
> not a KEMI python expert, but what you are trying to do (adding a process
> to Kamailio and then also maintaining it during run-time) could be probably
> better done from the C module level.
>
> You can look to the several modules that starts their own children worker
> processes to get an idea how to do it.
>
>
>
> Cheers,
>
>
>
> Henning
>
>
>
> --
>
> Henning Westerholt – https://skalatan.de/blog/
>
> Kamailio services – https://gilawa.com
>
>
>
> *From:* sr-users <sr-users-bounces at lists.kamailio.org> *On Behalf Of *Marat
> Gareev
> *Sent:* Wednesday, October 26, 2022 12:19 PM
> *To:* miconda at gmail.com
> *Cc:* Kamailio (SER) - Users Mailing List <sr-users at lists.kamailio.org>
> *Subject:* Re: [SR-Users] Kill child process created by app_python module
>
>
>
> Hello again,
>
>
>
> Any advice will be appreciated.
>
>
>
> Thanks
>
>
>
> чт, 15 сент. 2022 г. в 18:10, Marat Gareev <maratkin94 at gmail.com>:
>
> Hello Daniel,
>
>
>
> Probably, the process is not killed, because the child processes of the
> python module are not included in the kamailio children list.
>
>
>
> How can I register an event route in KEMI script?
>
> Doc
> <https://kamailio.org/docs/tutorials/devel/kamailio-kemi-framework/kemi/#python-kemi-interpreter>
> says:
>
> event route callback - the name of the Python function to be executed
> instead of module specific event_route blocks is provided via
> event_callback parameter of that module
>
> but evrexec
> <https://www.kamailio.org/docs/modules/devel/modules/evrexec.html>
> doesn't have an event_callback parameter.
>
>
>
> I tried to set up exec parameter (_update is Python function)
>
> modparam("evrexec", "exec", "name=_update;workers=1;")
>
> and got warning
>
> WARNING: evrexec [evrexec_mod.c:180]: evrexec_process(): empty event
> route block [_update]
>
>
>
>
>
> ср, 14 сент. 2022 г. в 16:21, Daniel-Constantin Mierla <miconda at gmail.com
> >:
>
> Hello,
>
> not sure I got right what is the issue and what would be a solution for
> it, but maybe you can leverage evrexec to create a child process and by
> that keep it in kamailio children list.
>
> Cheers,
> Daniel
>
> On 13.09.22 19:15, Marat Gareev wrote:
>
> Hello!
>
>
>
> I'm trying to use app_python module to perform periodic actions.
>
>
>
> This is a simple python code
>
> def *_update*():
>
> while True:
>
> _action()
>
> time.sleep(60)
>
> class *noop_handler*:
>
> def *child_init*(self, rank):
>
> return 0
>
> def *ksr_request_route*(self, msg):
>
> return 1
>
> def *mod_init*():
>
> *# signal.signal(signal.SIGTERM, signal.default_int_handler)*
>
> proc = multiprocessing.Process(target=*_update*)
>
> *# proc.daemon = True*
>
> proc.start()
>
> ksr.notice('Forked process {} to update\n'.*format*(proc.pid))
>
> return *noop_handler*()
>
>
>
> After killing kamailio processes with SIGTERM signal (killall kamailio) I
> see zombie process.
>
> And if I try to process the signal in daemon mode (see the comments in the
> snippet above), I get critical errors in the logs and still see processes:
>
> 0(37001) NOTICE: <core> [core/kemi.c:124]: sr_kemi_core_notice(): Forked
> process 37002 to update
>
> 1(37003) ERROR: <core> [core/udp_server.c:464]: udp_rcv_loop(): recvfrom:[
> 4] Interrupted system call
>
> Process Process-1:
>
> Traceback (most recent call last):
>
> File "/usr/lib64/python2.7/multiprocessing/process.py", line 258, in
> _bootstrap
>
> self.run()
>
> File "/usr/lib64/python2.7/multiprocessing/process.py", line 114, in run
>
> self._target(*self._args, **self._kwargs)
>
> File "/tmp/script.py", line 155, in _update
>
> time.sleep(period)
>
> KeyboardInterrupt
>
> 0(37001) ALERT: <core> [main.c:774]: handle_sigs(): child process 37002
> exited normally, status=1
>
> 0(37001) INFO: <core> [main.c:802]: handle_sigs(): terminating due to
> SIGCHLD
>
> 1(37003) ERROR: <core> [core/udp_server.c:464]: udp_rcv_loop(): recvfrom:[
> 4] Interrupted system call
>
> 8(37014) CRITICAL: <core> [core/pass_fd.c:277]: receive_fd(): EOF on 4
>
> 1(37003) ERROR: <core> [core/udp_server.c:464]: udp_rcv_loop(): recvfrom:[
> 4] Interrupted system call
>
>
>
> So, how I can kill child process by SIGTERM signal?
>
>
>
> __________________________________________________________
>
> Kamailio - Users Mailing List - Non Commercial Discussions
>
>   * sr-users at lists.kamailio.org
>
> Important: keep the mailing list in the recipients, do not reply only to the sender!
>
> Edit mailing list options or unsubscribe:
>
>   * https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>
> --
>
> Daniel-Constantin Mierla -- www.asipto.com
>
> www.twitter.com/miconda -- www.linkedin.com/in/miconda
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.kamailio.org/pipermail/sr-users/attachments/20221111/7e8b40e5/attachment.htm>