def _wait_for_state_change(target_state, ucs_power_handle):
    state = [None]
    retries = [0]

    def _wait(state, retries):
        state[0] = ucs_power_handle.get_power_state()
        if ((retries[0] != 0) and (
           UCS_TO_IRONIC_POWER_STATE.get(state[0]) == target_state)):
            raise loopingcall.LoopingCallDone()

        if retries[0] > CONF.cisco_ucs.max_retry:
            state[0] = states.ERROR
            raise loopingcall.LoopingCallDone()

        retries[0] += 1

    timer = loopingcall.FixedIntervalLoopingCall(_wait, state, retries)
    timer.start(interval=CONF.cisco_ucs.action_interval).wait()
    return UCS_TO_IRONIC_POWER_STATE.get(state[0], states.ERROR)
Wait and check for the power state change.
dataset/ETHPy150Open openstack/ironic/ironic/drivers/modules/ucs/power.py/_wait_for_state_change