Make notifications pluggable

- Defines a plugin interface for what's actually emitted as part
  of designate "notifications".
- The default plugin emits the same thing as notifications did prior
  to this patch.
- The "audit" notification plugin emits recordset data changes and
  zone/recordset names, if they exist, the notifications with this
  plugin look like http://paste.openstack.org/show/545210/
- Adds support for multiple notifications for a single change
- Also adds client IP to the context object, as it's a field that
  may be of interest to some types of notifications
- Many tests

Change-Id: I01118fae8ce6e38ccc61b0ce763fd759affd9a86

1 files changed, 5 insertions, 0 deletions

diff --git a/designate/api/middleware.py b/designate/api/middleware.py
index 49cfc024..0a941de8 100644
--- a/designate/api/middleware.py
+++ b/designate/api/middleware.py
@@ -107,6 +107,10 @@ class ContextMiddleware(base.Middleware):
                 strutils.bool_from_string(
                     request.headers.get('X-Designate-Edit-Managed-Records'))
 
+    def _extract_client_addr(self, ctxt, request):
+        if hasattr(request, 'client_addr'):
+            ctxt.client_addr = request.client_addr
+
     def make_context(self, request, *args, **kwargs):
         req_id = request.environ.get(request_id.ENV_REQUEST_ID)
         kwargs.setdefault('request_id', req_id)
@@ -118,6 +122,7 @@ class ContextMiddleware(base.Middleware):
             self._extract_all_projects(ctxt, request)
             self._extract_edit_managed_records(ctxt, request)
             self._extract_dns_hide_counts(ctxt, request)
+            self._extract_client_addr(ctxt, request)
         finally:
             request.environ['context'] = ctxt
         return ctxt