[Django]-Where to put Django startup code?

by

61👍

✅

Write middleware that does this in __init__ and afterwards raise django.core.exceptions.MiddlewareNotUsed from the __init__, django will remove it for all requests :). __init__ is called at startup by the way, not at the first request, so it won’t block your first user.

There is talk about adding a startup signal, but that won’t be available soon (a major problem for example is when this signal should be sent)

Related Ticket: https://code.djangoproject.com/ticket/13024

Update: Django 1.7 includes support for this. (Documentation, as linked by the ticket)

👤KillianDS

11👍

In Django 1.7+ if you want to run a startup code and,

1. Avoid running it in migrate, makemigrations, shell sessions, …

2. Avoid running it twice or more

A solution would be:

file: myapp/apps.py

from django.apps import AppConfig

def startup():
    # startup code goes here

class MyAppConfig(AppConfig):
    name = 'myapp'
    verbose_name = "My Application"
    def ready(self):
        import os
        if os.environ.get('RUN_MAIN'):
            startup()

file: myapp/__init__.py

default_app_config = 'myapp.apps.MyAppConfig'

This post is using suggestions from @Pykler and @bdoering

👤Joseph Bani

4👍

If you were using Apache/mod_wsgi for both, use the WSGI script file described in:

http://blog.dscpl.com.au/2010/03/improved-wsgi-script-for-use-with.html

Add what you need after language translations are activated.

Thus:

import sys

sys.path.insert(0, '/usr/local/django/mysite')

import settings

import django.core.management
django.core.management.setup_environ(settings)
utility = django.core.management.ManagementUtility()
command = utility.fetch_command('runserver')

command.validate()

import django.conf
import django.utils

django.utils.translation.activate(django.conf.settings.LANGUAGE_CODE)

# Your line here.
django.core.management.call_command('syncdb', interactive=False)

import django.core.handlers.wsgi

application = django.core.handlers.wsgi.WSGIHandler()
👤Graham Dumpleton

3👍

You can create a custom command and write your code in the handle function. details here https://docs.djangoproject.com/en/dev/howto/custom-management-commands/

Then you can create a startup script that runs the django server then executes your new custom command.

👤Emam

1👍

If you are using mod_wsgi you can put it in the wsgi start app

👤Aviah Laor

0👍

Here is how I work around the missing startup signal for Django:
https://github.com/lsaffre/djangosite/blob/master/djangosite/models.py
The code that is being called there is specific to my djangosite project, but the trick to get it called by writing a special app (based on an idea by Ross McFarland) should work for other environments.
Luc

👤Luc Saffre

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