airflow celery_queue 源码
airflow celery_queue 代码
文件路径：/airflow/providers/celery/sensors/celery_queue.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 typing import TYPE_CHECKING
from celery.app import control
from airflow.sensors.base import BaseSensorOperator
if TYPE_CHECKING:
from airflow.utils.context import Context
class CeleryQueueSensor(BaseSensorOperator):
"""
Waits for a Celery queue to be empty. By default, in order to be considered
empty, the queue must not have any tasks in the ``reserved``, ``scheduled``
or ``active`` states.
:param celery_queue: The name of the Celery queue to wait for.
:param target_task_id: Task id for checking
"""
def __init__(self, *, celery_queue: str, target_task_id: str | None = None, **kwargs) -> None:
super().__init__(**kwargs)
self.celery_queue = celery_queue
self.target_task_id = target_task_id
def _check_task_id(self, context: Context) -> bool:
"""
Gets the returned Celery result from the Airflow task
ID provided to the sensor, and returns True if the
celery result has been finished execution.
:param context: Airflow's execution context
:return: True if task has been executed, otherwise False
:rtype: bool
"""
ti = context['ti']
celery_result = ti.xcom_pull(task_ids=self.target_task_id)
return celery_result.ready()
def poke(self, context: Context) -> bool:
if self.target_task_id:
return self._check_task_id(context)
inspect_result = control.Inspect()
reserved = inspect_result.reserved()
scheduled = inspect_result.scheduled()
active = inspect_result.active()
try:
reserved = len(reserved[self.celery_queue])
scheduled = len(scheduled[self.celery_queue])
active = len(active[self.celery_queue])
self.log.info('Checking if celery queue %s is empty.', self.celery_queue)
return reserved == 0 and scheduled == 0 and active == 0
except KeyError:
raise KeyError(f'Could not locate Celery queue {self.celery_queue}')
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