Celery auto reload on ANY changes

Question

I could make celery reload itself automatically when there is changes on modules in CELERY_IMPORTS in settings.py.

I tried to give mother modules to detect changes even on child modules but it did not detect changes in child modules. That make me understand that detecting is not done recursively by celery. I searched it in the documentation but I did not meet any response for my problem.

It is really bothering me to add everything related celery part of my project to CELERY_IMPORTS to detect changes.

Is there a way to tell celery that "auto reload yourself when there is any changes in anywhere of project".

Thank You!

Answer 1

Celery --autoreload doesn't work and it is deprecated.

Since you are using django, you can write a management command for that. Django has autoreload utility which is used by runserver to restart WSGI server when code changes.

The same functionality can be used to reload celery workers. Create a seperate management command called celery. Write a function to kill existing worker and start a new worker. Now hook this function to autoreload as follows.

import shlex
import subprocess

from django.core.management.base import BaseCommand
from django.utils import autoreload


def restart_celery():
    cmd = 'pkill celery'
    subprocess.call(shlex.split(cmd))
    cmd = 'celery worker -l info -A foo'
    subprocess.call(shlex.split(cmd))


class Command(BaseCommand):

    def handle(self, *args, **options):
        print('Starting celery worker with autoreload...')

        # For Django>=2.2
        autoreload.run_with_reloader(restart_celery) 

        # For django<2.1
        # autoreload.main(restart_celery)

Now you can run celery worker with python manage.py celery which will autoreload when codebase changes.

This is only for development purposes and do not use it in production. Code taken from my other answer here.