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from airflow.sensors.base_sensor_operator import BaseSensorOperator
from airflow.utils import timezone
from airflow.utils.decorators import apply_defaults
[docs]class TimeDeltaSensor(BaseSensorOperator):
"""
Waits for a timedelta after the task's execution_date + schedule_interval.
In Airflow, the daily task stamped with ``execution_date``
2016-01-01 can only start running on 2016-01-02. The timedelta here
represents the time after the execution period has closed.
:param delta: time length to wait after execution_date before succeeding
:type delta: datetime.timedelta
"""
@apply_defaults
def __init__(self, delta, *args, **kwargs):
super(TimeDeltaSensor, self).__init__(*args, **kwargs)
self.delta = delta
[docs] def poke(self, context):
dag = context['dag']
target_dttm = dag.following_schedule(context['execution_date'])
target_dttm += self.delta
self.log.info('Checking if the time (%s) has come', target_dttm)
return timezone.utcnow() > target_dttm