airflow time_delta 源码
airflow time_delta 代码
文件路径：/airflow/sensors/time_delta.py
#
# 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 __future__ import annotations
from airflow.sensors.base import BaseSensorOperator
from airflow.triggers.temporal import DateTimeTrigger
from airflow.utils import timezone
from airflow.utils.context import Context
class TimeDeltaSensor(BaseSensorOperator):
"""
Waits for a timedelta after the run's data interval.
:param delta: time length to wait after the data interval before succeeding.
"""
def __init__(self, *, delta, **kwargs):
super().__init__(**kwargs)
self.delta = delta
def poke(self, context: Context):
target_dttm = context['data_interval_end']
target_dttm += self.delta
self.log.info('Checking if the time (%s) has come', target_dttm)
return timezone.utcnow() > target_dttm
class TimeDeltaSensorAsync(TimeDeltaSensor):
"""
A drop-in replacement for TimeDeltaSensor that defers itself to avoid
taking up a worker slot while it is waiting.
:param delta: time length to wait after the data interval before succeeding.
"""
def execute(self, context: Context):
target_dttm = context['data_interval_end']
target_dttm += self.delta
self.defer(trigger=DateTimeTrigger(moment=target_dttm), method_name="execute_complete")
def execute_complete(self, context, event=None):
"""Callback for when the trigger fires - returns immediately."""
return None
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