Uwsgi: atexit hook works incorrectly

[jekel]

Hello when using uwsgi + python, and trying to catch app exit
sending SIGINT or SIGTERM to the uwsgi master process - atexit hook does not work :(
in the uwsgi log is

SIGINT/SIGQUIT received...killing workers...
gateway "uWSGI http 1" has been buried (pid: 15703)
worker 1 buried after 1 seconds
goodbye to uWSGI.

how can i properly handle uwsgi shutdown? i haven't found any other hook except atexit for this

[unbit]

You can use atexit python module directly (https://docs.python.org/2/library/atexit.html) or the uwsgi.atexit callable (even if probably it is what you are trying to use). The relevant code path is here: https://github.com/unbit/uwsgi/blob/master/plugins/python/python_plugin.c#L322

[jekel]

uwsgi.atexit does now works for me.
part of test code:

uwsgi.post_fork_hook = after_fork
def after_fork():
    uwsgi.atexit = s
def s():
    print >>sys.stderr, 'exited'

uwsgi.ini

[dev]
listen = 128
gevent = 5000
module = main.server
http-keepalive = true
virtualenv = v
master = true

on SIGTERM/SEGQUIT hook does not works.
it fires only on SIGHUP...

[jekel]

any ideas how to make it work?

[unbit]

I would not trust "atexit" python way, it has proven to be really weak, expecially for most complex cases.

I strongly suggest you to move your "finalization" code in a dedicated python file and call it as a generic hook:

[uwsgi]
...
hook-as-user-atexit = exec:python finalization.py

[jekel]

@unbit it will run separate python script as independent process?
how can i make it run my function inside my project?

[cbsmith]

Yeah, the big need I have is to run some python function from inside the uWSGI python process so I can access all the data that is there. It sounds like uwsgi.atexit() is the way to go?

[jekel]

up.
will be there any solution to do so?

[unbit]

uwsgi.atexit() is a "last resort" but should work. What i fear here is that the gevent plugin must be improved for managing stop in addition to reloads. This line is where the "shutdown" happens: https://github.com/unbit/uwsgi/blob/master/plugins/gevent/gevent.c#L104

For non-gevent scenario, there is lot of work going on on the perl plugin to improve atexit management, maybe something could be backported to python too (implications are generally the same)

[unbit]

The gevent plugin now re-register SIGINT and SIGTERM to a custom handler that will respect atexit hooks

[jekel]

Great! it works! thank you