Fixes event ordering for alarm monitor and scale actions.

This commit adds code to support the below related to alarm
monitoring and scaling:
1.Consolidates the two event captures in the update_vnf_with_alarm
method into just a single event capture with alarm url details.
2.Captures events in update_vnf_with_alarm method when policy action
and alarm action name are missing.
3.Captures the event information for ActionAutoscalingHeat policy
action invocation and scaling action in the right time order.

Change-Id: Iea255a4f454fb0c721b152090514ad8ca8732890
Closes-Bug: #1629453

tacker/vnfm/monitor.py

@@ -219,22 +219,26 @@ class VNFAlarmMonitor(object):
         params = dict()
         params['vnf_id'] = vnf['id']
         params['mon_policy_name'] = policy_name
-        _log_monitor_events(t_context.get_admin_context(),
-                            vnf,
-                            "update vnf with alarm")
         driver = policy_dict['triggers']['resize_compute'][
             'event_type']['implementation']
         policy_action = policy_dict['triggers']['resize_compute'].get('action')
         if not policy_action:
+            _log_monitor_events(t_context.get_admin_context(),
+                                vnf,
+                                "Alarm not set: policy action missing")
             return
         alarm_action_name = policy_action['resize_compute'].get('action_name')
         if not alarm_action_name:
+            _log_monitor_events(t_context.get_admin_context(),
+                                vnf,
+                                "Alarm not set: alarm action name missing")
             return
         params['mon_policy_action'] = alarm_action_name
         alarm_url = self.call_alarm_url(driver, vnf, params)
+        details = "Alarm URL set successfully: %s" % alarm_url
         _log_monitor_events(t_context.get_admin_context(),
                             vnf,
-                            "Alarm url invoked")
+                            details)
         return alarm_url
         # vnf['attribute']['alarm_url'] = alarm_url ---> create
         # by plugin or vm_db
@@ -389,10 +393,10 @@ class ActionAutoscalingHeat(ActionPolicy):
     @classmethod
     def execute_action(cls, plugin, vnf_dict, scale):
         vnf_id = vnf_dict['id']
-        plugin.create_vnf_scale(t_context.get_admin_context(), vnf_id, scale)
         _log_monitor_events(t_context.get_admin_context(),
                             vnf_dict,
                             "ActionAutoscalingHeat invoked")
+        plugin.create_vnf_scale(t_context.get_admin_context(), vnf_id, scale)
 
 
 @ActionPolicy.register('log')

tacker/vnfm/plugin.py

@@ -759,6 +759,10 @@ class VNFMPlugin(vnfm_db.VNFMPluginDb, VNFMMgmtMixin):
             cp = policy['properties']['resize_compute']['condition'].\
                 get('comparison_operator')
             if bckend_policy_type == constants.POLICY_SCALING:
+                if vnf_dict['status'] != constants.ACTIVE:
+                    LOG.info(context, vnf_dict,
+                             "Scaling Policy action skipped")
+                    return
                 action = 'scaling'
                 scale = {}
                 scale.setdefault('scale', {})