103 lines
3.1 KiB
Python
Executable File
103 lines
3.1 KiB
Python
Executable File
# Copyright 2015 Huawei Technologies Co.,LTD.
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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 requests
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from magnum.conductor.handlers.common.cert_manager import create_client_files
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class KubernetesAPI:
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"""
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Simple Kubernetes API client using requests.
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This API wrapper allows for a set of very simple operations to be
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performed on a Kubernetes cluster using the `requests` library. The
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reason behind it is that the native `kubernetes` library does not
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seem to be quite thread-safe at the moment.
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Also, our interactions with the Kubernetes API are happening inside
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Greenthreads so we don't need to use connection pooling on top of it,
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in addition to pools not being something that you can disable with
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the native Kubernetes API.
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"""
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def __init__(self, context, cluster):
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self.context = context
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self.cluster = cluster
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# Load certificates for cluster
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(self.ca_file, self.key_file, self.cert_file) = create_client_files(
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self.cluster, self.context
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)
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def _request(self, method, url, json=True):
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response = requests.request(
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method,
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url,
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verify=self.ca_file.name,
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cert=(self.cert_file.name, self.key_file.name)
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)
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response.raise_for_status()
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if json:
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return response.json()
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else:
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return response.text
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def get_healthz(self):
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"""
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Get the health of the cluster from API
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"""
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return self._request(
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'GET',
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f"{self.cluster.api_address}/healthz",
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json=False
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)
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def list_node(self):
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"""
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List all nodes in the cluster.
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:return: List of nodes.
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"""
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return self._request(
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'GET',
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f"{self.cluster.api_address}/api/v1/nodes"
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)
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def list_namespaced_pod(self, namespace):
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"""
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List all pods in the given namespace.
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:param namespace: Namespace to list pods from.
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:return: List of pods.
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"""
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return self._request(
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'GET',
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f"{self.cluster.api_address}/api/v1/namespaces/{namespace}/pods"
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)
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def __del__(self):
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"""
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Close all of the file descriptions for the certificates, since they
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are left open by `create_client_files`.
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TODO(mnaser): Use a context manager and avoid having these here.
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"""
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if hasattr(self, 'ca_file'):
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self.ca_file.close()
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if hasattr(self, 'cert_file'):
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self.cert_file.close()
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if hasattr(self, 'key_file'):
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self.key_file.close()
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