Add support for overriding the celery class.

mayan/celery.py

@@ -2,12 +2,13 @@ from __future__ import absolute_import, unicode_literals
 
 import os
 
-from celery import Celery
 from django.conf import settings
 
+from .runtime import celery_class
+
 os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'mayan.settings.production')
 
-app = Celery('mayan')
+app = celery_class('mayan')
 
 app.config_from_object('django.conf:settings')
 app.autodiscover_tasks(lambda: settings.INSTALLED_APPS)

mayan/conf.py

@@ -0,0 +1,18 @@
+"""
+This module should be called settings.py but is named conf.py to avoid a
+class with the mayan/settings/* module
+"""
+
+from __future__ import unicode_literals
+
+from django.utils.translation import ugettext_lazy as _
+
+from smart_settings import Namespace
+
+namespace = Namespace(name='mayan', label=_('Mayan'))
+
+setting_celery_class = namespace.add_setting(
+    help_text=_('The class used to instanciate the main Celery app.'),
+    global_name='MAYAN_CELERY_CLASS',
+    default='celery.Celery'
+)

mayan/runtime.py

@@ -0,0 +1,5 @@
+from django.utils.module_loading import import_string
+
+from .conf import setting_celery_class
+
+celery_class = import_string(setting_celery_class.value)