| # -*- coding: utf-8 -*- |
| # |
| # Licensed to the Apache Software Foundation (ASF) under one |
| # or more contributor license agreements. See the NOTICE file |
| # distributed with this work for additional information |
| # regarding copyright ownership. The ASF licenses this file |
| # to you under the Apache License, Version 2.0 (the |
| # "License"); you may not use this file except in compliance |
| # with the License. You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, |
| # software distributed under the License is distributed on an |
| # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| # KIND, either express or implied. See the License for the |
| # specific language governing permissions and limitations |
| # under the License. |
| |
| from airflow.sensors.base_sensor_operator import BaseSensorOperator |
| from airflow.utils import timezone |
| from airflow.utils.decorators import apply_defaults |
| |
| |
| 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().__init__(*args, **kwargs) |
| self.delta = delta |
| |
| 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 |