def get_trail_ids(cls, event, mode):
        """extract resources ids from a cloud trail event."""
        resource_ids = ()
        event_name = event['detail']['eventName']
        event_source = event['detail']['eventSource']
        for e in mode.get('events', []):
            if not isinstance(e, dict):
                # Check if we have a short cut / alias
                info = CloudWatchEvents.match(event)
                if info:
                    return info['ids'].search(event)
                continue
            if event_name != e.get('event'):
                continue
            if event_source != e.get('source'):
                continue

            id_query = e.get('ids')
            if not id_query:
                raise ValueError("No id query configured")
            evt = event
            # be forgiving for users specifying with details or without
            if not id_query.startswith('detail.'):
                evt = event.get('detail', {})
            resource_ids = jmespath.search(id_query, evt)
            if resource_ids:
                break
        return resource_ids
extract resources ids from a cloud trail event.