django-run-context 1.0

Detetermine the context under which a Django project is run (provides a get_run_context function)

django-run-context

Provides a simple function that returns the run context that Django finds itself in.

The following values are currently supported:

• "runserver_reloader"
• "runserver_noreloader"
• "runserver_reloaded"
• "not runserver"

To use this just add to your settings.py:*

from django_run_context import get_run_context

RUN_CONTEXT = get_run_context()

and then anywhere else in you Django project you can access it:

```python
import django.conf.settings

print(settings.RUN_CONTEXT)
```

and use it to alter the behaviour of your app based on that context.

The immediate need it addressed was a desire to dump project diagnostics in debug mode, in the settings.py. For example a common paradigm I employ:

if DEBUG:
    log.debug(f"Django version: {django.__version__}")
    log.debug(f"Python version: {sys.version}")
    log.debug(f"Django loaded from: {django.__file__}")
    log.debug(f"Using Path: {sys.path}")
    log.debug(f"Process Info: {pinfo()}")
    log.debug(f"Static root: {STATIC_ROOT}")
    log.debug(f"Static file dirs: {locals().get('STATICFILES_DIRS', globals().get('STATICFILES_DIRS', []))}")
    log.debug(f"Installed apps: {INSTALLED_APPS}")
    log.debug(f"Database: {DATABASES['default']}")
    log.debug(f"Command line: {sys.argv}")

But this is spewed out twice, because by default runserver loads settings.py then starts a new instance of runserver that provides a web interface (at http://127.0.0.1:8000 by default) which again loads settings.py (the supervising instance of runserver does not act as a webserver at all, but watches the filesystem for changes and reruns the actual webserver instance). So, we can suppress the output under the first instance (the reloader)

if DEBUG and RUN_CONTEXT != "runserver_reloader":
    log.debug(f"Django version: {django.__version__}")
    log.debug(f"Python version: {sys.version}")
    log.debug(f"Django loaded from: {django.__file__}")
    log.debug(f"Using Path: {sys.path}")
    log.debug(f"Process Info: {pinfo()}")
    log.debug(f"Static root: {STATIC_ROOT}")
    log.debug(f"Static file dirs: {locals().get('STATICFILES_DIRS', globals().get('STATICFILES_DIRS', []))}")
    log.debug(f"Installed apps: {INSTALLED_APPS}")
    log.debug(f"Database: {DATABASES['default']}")
    log.debug(f"Command line: {sys.argv}")

and it is spewed put just once when the debug project starts up whether using reloader (the default) or not.

This can of course easily be extended for tests that are more specific than "not runserver", possibly telling us if uwsgi, gunicorn or daphne or some other context. Feel free to expand on it if you like (PRs gladly accepted).