common, vm: refactor activity code manipulating code

circle/common/operations.py

 from inspect import getargspec
 from logging import getLogger
 
-from .models import activity_context, activity_code_separator
+from .models import activity_context, has_suffix
 
 from django.core.exceptions import PermissionDenied
 
@@ -172,11 +172,15 @@ class OperatedMixin(object):
                 yield op
 
     def get_operation_from_activity_code(self, activity_code):
-        sep = activity_code_separator
-        ops = getattr(self, operation_registry_name, {}).values()
-        for op in ops:
-            if activity_code.endswith(sep + op.activity_code_suffix):
-                return op
+        """Get an instance of the Operation corresponding to the specified
+           activity code.
+
+        :returns: A bound instance of an operation, or None if no matching
+                  operation could be found.
+        """
+        for op in getattr(self, operation_registry_name, {}).itervalues():
+            if has_suffix(activity_code, op.activity_code_suffix):
+                return op(self)
         else:
             return None
 

circle/vm/models/activity.py

@@ -10,7 +10,7 @@ from django.utils import timezone
 from django.utils.translation import ugettext_lazy as _
 
 from common.models import (
-    ActivityModel, activitycontextimpl, join_activity_code,
+    ActivityModel, activitycontextimpl, join_activity_code, split_activity_code
 )
 
 from manager.mancelery import celery
@@ -56,7 +56,8 @@ class InstanceActivity(ActivityModel):
         return reverse('dashboard.views.vm-activity', args=[self.pk])
 
     def get_readable_name(self):
-        return self.activity_code.split('.')[-1].replace('_', ' ').capitalize()
+        activity_code_last_suffix = split_activity_code(self.activity_code)[-1]
+        return activity_code_last_suffix.replace('_', ' ').capitalize()
 
     def get_status_id(self):
         if self.succeeded is None: