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# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import contextlib
import json
import logging
import keystoneauth1.exceptions.http as ks_exceptions
import osc_lib.exceptions as exceptions
from osc_placement import version
_http_error_to_exc = {
cls.http_status: cls
for cls in exceptions.ClientException.__subclasses__()
}
LOG = logging.getLogger(__name__)
@contextlib.contextmanager
def _wrap_http_exceptions():
"""Reraise osc-lib exceptions with detailed messages."""
try:
yield
except ks_exceptions.HttpError as exc:
if 400 <= exc.http_status < 500:
detail = json.loads(exc.response.content)['errors'][0]['detail']
msg = detail.split('\n')[-1].strip()
exc_class = _http_error_to_exc.get(exc.http_status,
exceptions.CommandError)
raise exc_class(exc.http_status, msg) from exc
else:
raise
class SessionClient(object):
def __init__(self, session, ks_filter, api_version='1.0'):
self.session = session
self.ks_filter = ks_filter
self.negotiate_api_version(api_version)
def request(self, method, url, **kwargs):
version = kwargs.pop('version', None)
api_version = (self.ks_filter['service_type'] + ' '
+ (version or self.api_version))
headers = kwargs.pop('headers', {})
headers.setdefault('OpenStack-API-Version', api_version)
headers.setdefault('Accept', 'application/json')
with _wrap_http_exceptions():
return self.session.request(url, method,
headers=headers,
endpoint_filter=self.ks_filter,
**kwargs)
def negotiate_api_version(self, api_version):
"""Set api_version to self.
If negotiate version (only majorversion) is given, talk to server to
pick up max microversion supported both by client and by server.
"""
if api_version not in version.NEGOTIATE_VERSIONS:
self.api_version = api_version
return
client_ver = version.MAX_VERSION_NO_GAP
self.api_version = client_ver
resp = self.request('GET', '/', raise_exc=False)
if resp.status_code == 406:
server_ver = resp.json()['errors'][0]['max_version']
self.api_version = server_ver
LOG.debug('Microversion %s not supported in server. '
'Falling back to microversion %s',
client_ver, server_ver)
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