138 lines
4.6 KiB
Python
138 lines
4.6 KiB
Python
# Copyright 2018 AT&T Intellectual Property. All other rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import falcon
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import kubernetes
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from kubernetes.client.rest import ApiException
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from urllib3.exceptions import MaxRetryError
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from promenade import logging
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from promenade.exceptions import KubernetesApiError
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from promenade.exceptions import KubernetesConfigException
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from promenade.exceptions import NodeNotFoundException
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from promenade.utils.success_message import SuccessMessage
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LOG = logging.getLogger(__name__)
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class KubeClient(object):
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"""
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Class for Kubernetes APIs client
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"""
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def __init__(self):
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""" Set Kubernetes APIs connection """
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try:
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LOG.info('Loading in-cluster Kubernetes configuration.')
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kubernetes.config.load_incluster_config()
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except kubernetes.config.config_exception.ConfigException:
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LOG.debug('Failed to load in-cluster configuration')
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try:
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LOG.info('Loading out-of-cluster Kubernetes configuration.')
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kubernetes.config.load_kube_config()
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except FileNotFoundError:
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LOG.exception(
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'FileNotFoundError: Failed to load Kubernetes config file.'
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)
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raise KubernetesConfigException
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self.client = kubernetes.client.CoreV1Api()
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def update_node_labels(self, node_name, input_labels):
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"""
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Updating node labels
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Args:
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node_name(str): node for which updating labels
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input_labels(dict): input labels dict
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Returns:
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SuccessMessage(dict): API success response
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"""
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resp_body_succ = SuccessMessage('Update node labels', falcon.HTTP_200)
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try:
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existing_labels = self.get_node_labels(node_name)
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update_labels = _get_update_labels(existing_labels, input_labels)
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# If there is a change
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if bool(update_labels):
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body = {"metadata": {"labels": update_labels}}
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self.client.patch_node(node_name, body)
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return resp_body_succ.get_output_json()
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except (ApiException, MaxRetryError) as e:
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LOG.exception("An exception occurred during node labels update: " +
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str(e))
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raise KubernetesApiError
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def get_node_labels(self, node_name):
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"""
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Get existing registered node labels
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Args:
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node_name(str): node of which getting labels
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Returns:
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dict: labels dict
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"""
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try:
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response = self.client.read_node(node_name)
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if response is not None:
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return response.metadata.labels
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else:
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return {}
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except (ApiException, MaxRetryError) as e:
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LOG.exception("An exception occurred in fetching node labels: " +
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str(e))
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if hasattr(e, 'status') and str(e.status) == "404":
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raise NodeNotFoundException
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else:
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raise KubernetesApiError
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def _get_update_labels(existing_labels, input_labels):
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"""
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Helper function to add new labels, delete labels, override
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existing labels
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Args:
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existing_labels(dict): Existing node labels
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input_labels(dict): Input/Req. labels
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Returns:
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update_labels(dict): Node labels to be updated
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or
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input_labels(dict): Node labels to be updated
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"""
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update_labels = {}
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# no existing labels found
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if not existing_labels:
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# filter delete label request since there is no labels set on a node
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update_labels.update({
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k: v
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for k, v in input_labels.items() if v is not None
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})
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return update_labels
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# new labels or overriding labels
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update_labels.update({
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k: v
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for k, v in input_labels.items()
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if k not in existing_labels or v != existing_labels[k]
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})
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# deleted labels
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update_labels.update({
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k: None
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for k in existing_labels.keys()
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if k not in input_labels and "kubernetes.io" not in k
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})
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return update_labels
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