airflow k8s_model 源码

  • 2022-10-20
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airflow k8s_model 代码

文件路径:/airflow/kubernetes/k8s_model.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.
"""Classes for interacting with Kubernetes API."""
from __future__ import annotations

from abc import ABC, abstractmethod
from functools import reduce

from kubernetes.client import models as k8s


class K8SModel(ABC):
    """
    These Airflow Kubernetes models are here for backwards compatibility
    reasons only. Ideally clients should use the kubernetes api
    and the process of

        client input -> Airflow k8s models -> k8s models

    can be avoided. All of these models implement the
    `attach_to_pod` method so that they integrate with the kubernetes client.
    """

    @abstractmethod
    def attach_to_pod(self, pod: k8s.V1Pod) -> k8s.V1Pod:
        """
        :param pod: A pod to attach this Kubernetes object to
        :return: The pod with the object attached
        """


def append_to_pod(pod: k8s.V1Pod, k8s_objects: list[K8SModel] | None):
    """
    :param pod: A pod to attach a list of Kubernetes objects to
    :param k8s_objects: a potential None list of K8SModels
    :return: pod with the objects attached if they exist
    """
    if not k8s_objects:
        return pod
    return reduce(lambda p, o: o.attach_to_pod(p), k8s_objects, pod)

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