'GET /interactive_environments/ready/
Queries the GIE proxy IPC to determine whether the current user\'s session\'s GIE launch is ready
:returns:   ``true`` if ready else ``false``
:rtype:     boolean'

@expose
@json
def ready(self, trans, **kwd):

    proxy_map = self.app.proxy_manager.query_proxy(trans)
    if (not proxy_map.container_interface):
        return True
    container_interfaces = build_container_interfaces(self.app.config.containers_config_file, containers_conf=self.app.config.containers_conf)
    try:
        interface = container_interfaces[proxy_map.container_interface]
    except KeyError:
        log.error('Invalid    container    interface    key:    %s', proxy_map.container_interface)
        return None
    container = interface.get_container(proxy_map.container_ids[0])
    return container.is_ready()
