'Log user operation.'

def process_response(self, request, response):

    log_format = self._get_log_format(request)
    if (not log_format):
        return response
    params = self._get_parameters_from_request(request)
    messages = django_messages.get_messages(request)
    result_message = None
    if messages:
        result_message = ',    '.join((('%s:    %s' % (message.tags, message)) for message in messages))
    elif ('action' in request.POST):
        result_message = request.POST['action']
    params['message'] = result_message
    params['http_status'] = response.status_code
    self.OPERATION_LOG.info(log_format, params)
    return response
