pluggable-backends: Implemented backend loading from settings.

git-svn-id: https://django-notification.googlecode.com/svn/branches/pluggable-backends@57 590c3fc9-4838-0410-bb95-17a0c9b37ca9

notification/backends/__init__.py

@@ -1,2 +1,19 @@
 
+from django.conf import settings
+from django.core import exceptions
+
 from base import BaseBackend
+
+def load_backends():
+    backends = []
+    for label, backend_path in getattr(settings, "NOTIFICATION_BACKENDS", tuple()):
+        dot = backend_path.rindex('.')
+        backend_mod, backend_class = backend_path[:dot], backend_path[dot+1:]
+        try:
+            mod = __import__(backend_mod, {}, {}, [""])
+        except ImportError, e:
+            raise exceptions.ImproperlyConfigured, 'Error importing notification backend %s: "%s"' % (backend_mod, e)
+        # add the backend label and an instaniated backend class to the
+        # backends list.
+        backends.append(label, getattr(backend_mod, "")())
+    return dict(backend_list)

notification/models.py

@@ -11,6 +11,8 @@
 from django.utils.translation import ugettext_lazy as _
 from django.utils.translation import ugettext
 
+from notification import backends
+
 
 class NoticeType(models.Model):
 
@@ -31,12 +33,13 @@ class Meta:
         verbose_name = _("notice type")
         verbose_name_plural = _("notice types")
 
-# if this gets updated, the create() method below needs to be as well...
-NOTICE_MEDIA = (
-    ("1", _("Email")),
+NOTIFICATION_BACKENDS = backends.load_backends()
+NOTICE_MEDIA = tuple(
+    ((i, backend_label) for i, backend_label in enumerate(NOTIFICATION_BACKENDS.keys()))
 )
 
 # how spam-sensitive is the medium
+# TODO: fix this with the backends
 NOTICE_MEDIA_DEFAULTS = {
     "1": 2 # email
 }
@@ -244,6 +247,8 @@ def send(users, notice_type_label, message_template, object_list=None, issue_not
     
     This is intended to be how other apps create new notices.
     """
+    backends = NOTIFICATION_BACKENDS.values()
+
     notice_type = NoticeType.objects.get(label=notice_type_label)
     message = encode_message(message_template, object_list)