Provide default limit and offset for alarm_list

Also display error instead of swallowing it

Change-Id: If3f569920ea9bfaa12b32af368e83a93f61a2ec9
Closes-Bug: #1472372

monitoring/alarms/views.py

@@ -79,7 +79,9 @@ def get_status(alarms):
 def generate_status(request):
     try:
         alarms = api.monitor.alarm_list(request)
-    except Exception:
+    except Exception as e:
+        messages.error(request,
+                       _('Unable to list alarms: %s') % str(e))
         alarms = []
     alarms_by_service = {}
     for a in alarms:

monitoring/api/monitor.py

@@ -60,7 +60,7 @@ def monascaclient(request, password=None):
     return client
 
 
-def alarm_list(request, offset, limit, marker=None, paginate=False):
+def alarm_list(request, offset=0, limit=10000, marker=None, paginate=False):
     result = monascaclient(request).alarms.list(offset=offset, limit=limit)
     return result['elements'] if type(result) is dict else result
 

monitoring/overview/views.py

@@ -19,6 +19,7 @@ import logging
 import urllib
 
 from django.conf import settings  # noqa
+from django.contrib import messages
 from django.core.urlresolvers import reverse_lazy
 from django.http import HttpResponse  # noqa
 from django.views.generic import TemplateView  # noqa
@@ -91,7 +92,9 @@ def get_status(alarms):
 def generate_status(request):
     try:
         alarms = api.monitor.alarm_list(request)
-    except Exception:
+    except Exception as e:
+        messages.error(request,
+                       _('Unable to list alarms: %s') % str(e))
         alarms = []
     alarms_by_service = {}
     for a in alarms: