d68a97fe47
Adds basic K8s client implementation and CONF-based singletons for both Neutron and K8s clients. The K8s client added by this patch should be considered a temporary solution that only implements the necessary parts to let us move forward with kuryr-kubernetes. Eventually it will be replaced by either [1] or [2]. The problem with [1] is that it does not yet support the streaming API that we need for WATCH. And [2] is outside of the OSt umbrella, so [1] is preferred over [2] unless [2] makes it into global-requirements.txt. [1] https://github.com/openstack/python-k8sclient [2] https://pypi.python.org/pypi/pykube NOTE: Removed py3-related code from config and top-level __init__. How to properly deal with that code is TBD. Change-Id: Ib4eb410eaf9725c296fcdddd8857eb24b8929915 Partially-Implements: blueprint kuryr-k8s-integration
67 lines
2.3 KiB
Python
67 lines
2.3 KiB
Python
# Copyright (c) 2016 Mirantis, Inc.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# 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, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import contextlib
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from oslo_serialization import jsonutils
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import requests
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from kuryr_kubernetes import exceptions as exc
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class K8sClient(object):
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# REVISIT(ivc): replace with python-k8sclient if it could be extended
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# with 'WATCH' support
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def __init__(self, base_url):
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self._base_url = base_url
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def get(self, path):
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url = self._base_url + path
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response = requests.get(url)
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if not response.ok:
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raise exc.K8sClientException(response.text)
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return response.json()
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def annotate(self, path, annotations):
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url = self._base_url + path
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data = jsonutils.dumps({
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"metadata": {
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"annotations": annotations
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}
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})
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response = requests.patch(url, data=data, headers={
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'Content-Type': 'application/merge-patch+json',
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'Accept': 'application/json',
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})
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if not response.ok:
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raise exc.K8sClientException(response.text)
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return response.json()['metadata']['annotations']
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def watch(self, path):
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params = {'watch': 'true'}
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url = self._base_url + path
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# TODO(ivc): handle connection errors and retry on failure
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while True:
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with contextlib.closing(requests.get(url, params=params,
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stream=True)) as response:
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if not response.ok:
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raise exc.K8sClientException(response.text)
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for line in response.iter_lines(delimiter='\n'):
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line = line.strip()
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if line:
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yield jsonutils.loads(line)
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