airflow python_kubernetes_script 源码
airflow python_kubernetes_script 代码
文件路径：/airflow/providers/cncf/kubernetes/python_kubernetes_script.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.
"""Utilities for using the kubernetes decorator"""
from __future__ import annotations
import os
from collections import deque
import jinja2
def _balance_parens(after_decorator):
num_paren = 1
after_decorator = deque(after_decorator)
after_decorator.popleft()
while num_paren:
current = after_decorator.popleft()
if current == "(":
num_paren = num_paren + 1
elif current == ")":
num_paren = num_paren - 1
return ''.join(after_decorator)
def remove_task_decorator(python_source: str, task_decorator_name: str) -> str:
"""
Removed @kubernetes_task
:param python_source:
"""
if task_decorator_name not in python_source:
return python_source
split = python_source.split(task_decorator_name)
before_decorator, after_decorator = split[0], split[1]
if after_decorator[0] == "(":
after_decorator = _balance_parens(after_decorator)
if after_decorator[0] == "\n":
after_decorator = after_decorator[1:]
return before_decorator + after_decorator
def write_python_script(
jinja_context: dict,
filename: str,
render_template_as_native_obj: bool = False,
):
"""
Renders the python script to a file to execute in the virtual environment.
:param jinja_context: The jinja context variables to unpack and replace with its placeholders in the
template file.
:param filename: The name of the file to dump the rendered script to.
:param render_template_as_native_obj: If ``True``, rendered Jinja template would be converted
to a native Python object
"""
template_loader = jinja2.FileSystemLoader(searchpath=os.path.dirname(__file__))
template_env: jinja2.Environment
if render_template_as_native_obj:
template_env = jinja2.nativetypes.NativeEnvironment(
loader=template_loader, undefined=jinja2.StrictUndefined
)
else:
template_env = jinja2.Environment(loader=template_loader, undefined=jinja2.StrictUndefined)
template = template_env.get_template('python_kubernetes_script.jinja2')
template.stream(**jinja_context).dump(filename)
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