def METHOD_NAME(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