Add celery task for get_email

Allows you to get_email even without cron, thus enabling the use of django-helpdesk of cronless PaaS services.

docs/configuration.rst

@@ -9,7 +9,7 @@ Before django-helpdesk will be much use, you need to do some basic configuration
 
 2. Visit ``http://yoursite/helpdesk/`` (or whatever path as defined in your ``urls.py``)
 
-3. If you wish to automatically create tickets from the contents of an e-mail inbox, set up a cronjob to run the management command on a regular basis. 
+3. If you wish to automatically create tickets from the contents of an e-mail inbox, set up a cronjob to run the management command on a regular basis. (Or use Celery, see below)
 
    Don't forget to set the relevant Django environment variables in your crontab::
 
@@ -19,6 +19,8 @@ Before django-helpdesk will be much use, you need to do some basic configuration
 
    **IMPORTANT NOTE**: Any tickets created via POP3 or IMAP mailboxes will DELETE the original e-mail from the mail server.
 
+ If you wish to use `celery` instead of cron, you must add 'django_celery_beat' to `INSTALLED_APPS` and add a periodic celery task through the Django admin.
+
 4. If you wish to automatically escalate tickets based on their age, set up a cronjob to run the escalation command on a regular basis::
 
        0 * * * * /path/to/helpdesksite/manage.py escalate_tickets

helpdesk/tasks.py

@@ -0,0 +1,8 @@
+from celery import task
+
+from .email import process_email
+
+
+@task()
+def helpdesk_process_email():
+    process_email()

helpdesk/urls.py

@@ -15,6 +15,10 @@ from django.views.generic import TemplateView
 from helpdesk.decorators import helpdesk_staff_member_required, protect_view
 from helpdesk import settings as helpdesk_settings
 from helpdesk.views import feeds, staff, public, kb
+try:
+    import helpdesk.tasks
+except ImportError:
+    pass
 
 
 class DirectTemplateView(TemplateView):

requirements.txt

@@ -1,5 +1,7 @@
 Django>=1.11,<3
 django-bootstrap-form>=3.3,<4
+celery
+django-celery-beat
 email-reply-parser
 django-markdown-deux
 beautifulsoup4