目標:
弄清楚st2notifier服務原理
1 主入口
st2/st2actions/st2actions/notifier/scheduler.py
def get_rescheduler():
timer = BlockingScheduler()
time_spec = {
'seconds': cfg.CONF.scheduler.rescheduling_interval,
'timezone': aps_utils.astimezone('UTC')
}
timer.add_job(recover_delayed_executions,
trigger=IntervalTrigger(**time_spec),
max_instances=1,
misfire_grace_time=60,
next_run_time=date_utils.get_datetime_utc_now(),
replace_existing=True)
return timer
def recover_delayed_executions():
coordinator = coordination.get_coordinator()
dt_now = date_utils.get_datetime_utc_now()
dt_delta = datetime.timedelta(seconds=cfg.CONF.scheduler.delayed_execution_recovery)
dt_timeout = dt_now - dt_delta
with coordinator.get_lock('st2-rescheduling-delayed-executions'):
liveactions = LiveAction.query(status=action_constants.LIVEACTION_STATUS_DELAYED,
start_timestamp__lte=dt_timeout,
order_by=['start_timestamp'])
if not liveactions:
return
LOG.info('There are %d liveactions that have been delayed for longer than %d seconds.',
len(liveactions), cfg.CONF.scheduler.delayed_execution_recovery)
# Update status to requested and publish status for each liveactions.
rescheduled = 0
for instance in liveactions:
try:
action_service.update_status(instance,
action_constants.LIVEACTION_STATUS_REQUESTED,
publish=True)
rescheduled += 1
except:
LOG.exception('Unable to reschedule liveaction. <LiveAction.id=%s>', instance.id)
LOG.info('Rescheduled %d out of %d delayed liveactions.', len(liveactions), rescheduled)
其中get_scheduler方法被如下代碼調用
st2/st2actions/st2actions/cmd/st2notifier.py
def _run_worker():
LOG.info('(PID=%s) Actions notifier started.', os.getpid())
actions_notifier = notifier.get_notifier()
actions_rescheduler = None
try:
if cfg.CONF.scheduler.enable:
actions_rescheduler = scheduler.get_rescheduler()
eventlet.spawn(actions_rescheduler.start)
LOG.info(SCHEDULER_ENABLED_LOG_LINE)
else:
LOG.info(SCHEDULER_DISABLED_LOG_LINE)
actions_notifier.start(wait=True)
except (KeyboardInterrupt, SystemExit):
LOG.info('(PID=%s) Actions notifier stopped.', os.getpid())
if actions_rescheduler:
actions_rescheduler.shutdown()
actions_notifier.shutdown()
return 0
分析:
st2resultstracker通過調用Mstral API端點，跟蹤長時間運行的工作流的執行情況。
st2notifier在ActionExecution執行完成時TriggerInstances產生st2.core.actiontrigger和st2.core.notifytrigger。另外一個目的是充當action的備份調度器，處理哪些可能未列入計劃的action。
/opt/stackstorm/st2/bin/st2notifier --config-file /etc/st2/st2.conf
參考:
stackstorm 2.6代碼
https://blog.csdn.net/qingyuanluofeng/article/details/86653975