airflow __init__ 源码
airflow init 代码
文件路径：/airflow/task/task_runner/init.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
import logging
from airflow.configuration import conf
from airflow.exceptions import AirflowConfigException
from airflow.utils.module_loading import import_string
log = logging.getLogger(__name__)
_TASK_RUNNER_NAME = conf.get('core', 'TASK_RUNNER')
STANDARD_TASK_RUNNER = "StandardTaskRunner"
CGROUP_TASK_RUNNER = "CgroupTaskRunner"
CORE_TASK_RUNNERS = {
STANDARD_TASK_RUNNER: "airflow.task.task_runner.standard_task_runner.StandardTaskRunner",
CGROUP_TASK_RUNNER: "airflow.task.task_runner.cgroup_task_runner.CgroupTaskRunner",
}
def get_task_runner(local_task_job):
"""
Get the task runner that can be used to run the given job.
:param local_task_job: The LocalTaskJob associated with the TaskInstance
that needs to be executed.
:return: The task runner to use to run the task.
:rtype: airflow.task.task_runner.base_task_runner.BaseTaskRunner
"""
if _TASK_RUNNER_NAME in CORE_TASK_RUNNERS:
log.debug("Loading core task runner: %s", _TASK_RUNNER_NAME)
task_runner_class = import_string(CORE_TASK_RUNNERS[_TASK_RUNNER_NAME])
else:
log.debug("Loading task runner from custom path: %s", _TASK_RUNNER_NAME)
try:
task_runner_class = import_string(_TASK_RUNNER_NAME)
except ImportError:
raise AirflowConfigException(
f'The task runner could not be loaded. Please check "task_runner" key in "core" section. '
f'Current value: "{_TASK_RUNNER_NAME}".'
)
task_runner = task_runner_class(local_task_job)
return task_runner
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