text: 
  class GAFailure(Exception):
      pass
  
  def add_event(request, action, category=None, label=None, value=1, fail_silently=False):
      """
      Attempt to add a message to the request using the 'messages' app.
      """
      try:
          events = request._ga_events
      except AttributeError:
          if not hasattr(request, 'META'):
              raise TypeError(
                  "add_message() argument must be an HttpRequest object, not "
                  "'%s'." % request.__class__.__name__
              )
          if not fail_silently:
              raise GAFailure(
                  'You cannot add messages without installing '
                  'django.contrib.messages.middleware.MessageMiddleware'
              )
      else:
          return events.add(action, category, label, value)
  
  
  def get_events(request):
      """
      Return the message storage on the request if it exists, otherwise return
      an empty list.
      """
      if not hasattr(request, '_ga_events'):
          return []
      return request._ga_events
  