Implement DBaaS Ceilometer Notifications

Defines and implements create|end|error notifications for
all state-changing Trove API calls.  Adds a notification to
the TroveContext to transfer the notification to the guest
and conductor so that errors on asynchronous commands can
be forwarded to the Conductor to be transferred to the
control plane bus.

Also did some cleanup on the existing notifications to bring
them all under a common framework in trove/common/notifications.py.
The trove.instance.exists notification was not integrated into
the new framework due to its close-coupling with the Nova
notification code.

Reworked the cluster action mechanism to move routing
functionality from the strategy to the Cluster base
class.  This was done to support tying notifications
to cluster specific actions.

Implements Blueprint: ceilometer-integration

Change-Id: I9c57d24f80d8d3116fc0cc8948094087a0495135

1 files changed, 12 insertions, 2 deletions

diff --git a/trove/backup/service.py b/trove/backup/service.py
index cdba5d80..6ebe8c95 100644
--- a/trove/backup/service.py
+++ b/trove/backup/service.py
@@ -20,6 +20,8 @@ from trove.backup import views
 from trove.common import apischema
 from trove.common import cfg
 from trove.common.i18n import _
+from trove.common import notification
+from trove.common.notification import StartNotification
 from trove.common import pagination
 from trove.common import wsgi
 
@@ -62,7 +64,12 @@ class BackupController(wsgi.Controller):
         name = data['name']
         desc = data.get('description')
         parent = data.get('parent_id')
-        backup = Backup.create(context, instance, name, desc, parent_id=parent)
+        context.notification = notification.DBaaSBackupCreate(context,
+                                                              request=req)
+        with StartNotification(context, name=name, instance_id=instance,
+                               description=desc, parent_id=parent):
+            backup = Backup.create(context, instance, name, desc,
+                                   parent_id=parent)
         return wsgi.Result(views.BackupView(backup).data(), 202)
 
     def delete(self, req, tenant_id, id):
@@ -70,5 +77,8 @@ class BackupController(wsgi.Controller):
                    'ID: %(backup_id)s') %
                  {'tenant_id': tenant_id, 'backup_id': id})
         context = req.environ[wsgi.CONTEXT_KEY]
-        Backup.delete(context, id)
+        context.notification = notification.DBaaSBackupDelete(context,
+                                                              request=req)
+        with StartNotification(context, backup_id=id):
+            Backup.delete(context, id)
         return wsgi.Result(None, 202)