87 lines
3.1 KiB
Python
87 lines
3.1 KiB
Python
# 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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import logging
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import keystoneauth1.exceptions.http as ks_exceptions
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import osc_lib.exceptions as exceptions
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import simplejson as json
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from osc_placement import version
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_http_error_to_exc = {
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cls.http_status: cls
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for cls in exceptions.ClientException.__subclasses__()
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}
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LOG = logging.getLogger(__name__)
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@contextlib.contextmanager
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def _wrap_http_exceptions():
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"""Reraise osc-lib exceptions with detailed messages."""
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try:
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yield
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except ks_exceptions.HttpError as exc:
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if 400 <= exc.http_status < 500:
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detail = json.loads(exc.response.content)['errors'][0]['detail']
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msg = detail.split('\n')[-1].strip()
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exc_class = _http_error_to_exc.get(exc.http_status,
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exceptions.CommandError)
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raise exc_class(exc.http_status, msg) from exc
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else:
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raise
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class SessionClient(object):
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def __init__(self, session, ks_filter, api_version='1.0'):
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self.session = session
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self.ks_filter = ks_filter
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self.negotiate_api_version(api_version)
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def request(self, method, url, **kwargs):
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version = kwargs.pop('version', None)
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api_version = (self.ks_filter['service_type'] + ' '
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+ (version or self.api_version))
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headers = kwargs.pop('headers', {})
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headers.setdefault('OpenStack-API-Version', api_version)
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headers.setdefault('Accept', 'application/json')
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with _wrap_http_exceptions():
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return self.session.request(url, method,
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headers=headers,
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endpoint_filter=self.ks_filter,
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**kwargs)
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def negotiate_api_version(self, api_version):
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"""Set api_version to self.
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If negotiate version (only majorversion) is given, talk to server to
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pick up max microversion supported both by client and by server.
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"""
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if api_version not in version.NEGOTIATE_VERSIONS:
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self.api_version = api_version
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return
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client_ver = version.MAX_VERSION_NO_GAP
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self.api_version = client_ver
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resp = self.request('GET', '/', raise_exc=False)
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if resp.status_code == 406:
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server_ver = resp.json()['errors'][0]['max_version']
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self.api_version = server_ver
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LOG.debug('Microversion %s not supported in server. '
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'Falling back to microversion %s',
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client_ver, server_ver)
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