6424eb419a
The session is used to fetch the almanach url from keystone Change-Id: I7122c5870624985dc122a9b78ffebdb4a925235d
107 lines
4.0 KiB
Python
107 lines
4.0 KiB
Python
# Copyright 2017 INAP
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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 abc
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import json
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import logging
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import requests
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from almanachclient import exceptions
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from almanachclient import version as client_version
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logger = logging.getLogger(__name__)
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class HttpClient(metaclass=abc.ABCMeta):
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def __init__(self, url=None, token=None,
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session=None, region_name=None,
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service_type='cloudmetrics', endpoint_type=None):
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"""Initialization of Client object.
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:param string url: The endpoint of the Almanach service. Overrides the session url.
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:param string token: The Almanach X-Auth-Token.
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:param session: A session object that can be used for communication.
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:type session: keystonauth.session.Session
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:param string region_name:
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:param string service_type:
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:param string endpoint_type:
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"""
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if not url and not session:
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raise ValueError('A session or an endpoint must be provided')
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if session:
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self.url = session.get_endpoint(service_type=service_type, region_name=region_name, interface=endpoint_type)
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if url:
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self.url = url
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self.token = token
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def _get(self, url, params=None):
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logger.debug(url)
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return self._parse_response(requests.get(url, headers=self._get_headers(), params=params))
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def _put(self, url, data, params=None):
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logger.debug(url)
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return self._parse_response(requests.put(url,
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headers=self._get_headers(),
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params=params,
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data=json.dumps(data)))
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def _post(self, url, data, params=None):
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logger.debug(url)
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response = requests.post(url,
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headers=self._get_headers(),
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params=params,
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data=json.dumps(data))
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return self._parse_response(response, 201)
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def _delete(self, url, params=None, data=None):
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logger.debug(url)
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response = requests.delete(url,
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headers=self._get_headers(),
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params=params,
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data=json.dumps(data) if data else None)
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return self._parse_response(response, 202)
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def _parse_response(self, response, expected_status=200):
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if response.status_code != expected_status:
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raise exceptions.HTTPError('{} ({})'.format(self._get_error_message(response), response.status_code))
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return self._get_body(response)
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def _get_body(self, response):
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if self._is_json_response(response) and self._has_content(response):
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return response.json()
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return ''
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def _get_error_message(self, response, default_message='HTTP Error'):
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body = self._get_body(response)
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return body.get('error', default_message) if isinstance(body, dict) else response.text
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def _is_json_response(self, response):
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return 'Content-Type' in response.headers and 'application/json' in response.headers['Content-Type']
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def _has_content(self, response):
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return 'Content-Length' in response.headers and int(response.headers['Content-Length']) > 0
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def _get_headers(self):
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return {
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'Content-Type': 'application/json',
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'Accept': 'application/json',
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'User-Agent': 'python-almanachclient/{}'.format(client_version.__version__),
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'X-Auth-Token': self.token,
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}
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