A Python agent for provisioning and deprovisioning Bare Metal servers.
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# Copyright 2013 Rackspace, Inc.
#
# 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.
from oslo_config import cfg
from oslo_log import log
from oslo_serialization import jsonutils
from oslo_service import loopingcall
import requests
from ironic_python_agent import encoding
from ironic_python_agent import errors
from ironic_python_agent import netutils
from ironic_python_agent import utils
from ironic_python_agent import version
CONF = cfg.CONF
LOG = log.getLogger(__name__)
MIN_IRONIC_VERSION = (1, 22)
AGENT_VERSION_IRONIC_VERSION = (1, 36)
class APIClient(object):
api_version = 'v1'
lookup_api = '/%s/lookup' % api_version
heartbeat_api = '/%s/heartbeat/{uuid}' % api_version
_ironic_api_version = None
def __init__(self, api_url):
self.api_url = api_url.rstrip('/')
# Only keep alive a maximum of 2 connections to the API. More will be
# opened if they are needed, but they will be closed immediately after
# use.
adapter = requests.adapters.HTTPAdapter(pool_connections=2,
pool_maxsize=2)
self.session = requests.Session()
self.session.mount(self.api_url, adapter)
self.encoder = encoding.RESTJSONEncoder()
def _request(self, method, path, data=None, headers=None, **kwargs):
request_url = '{api_url}{path}'.format(api_url=self.api_url, path=path)
if data is not None:
data = self.encoder.encode(data)
headers = headers or {}
headers.update({
'Content-Type': 'application/json',
'Accept': 'application/json',
})
verify, cert = utils.get_ssl_client_options(CONF)
return self.session.request(method,
request_url,
headers=headers,
data=data,
verify=verify,
cert=cert,
**kwargs)
def _get_ironic_api_version_header(self, version=MIN_IRONIC_VERSION):
version_str = "%d.%d" % version
return {'X-OpenStack-Ironic-API-Version': version_str}
def _get_ironic_api_version(self):
if not self._ironic_api_version:
try:
response = self._request('GET', '/')
data = jsonutils.loads(response.content)
version = data['default_version']['version'].split('.')
self._ironic_api_version = (int(version[0]), int(version[1]))
except Exception:
LOG.exception("An error occurred while attempting to discover "
"the available Ironic API versions, falling "
"back to using version %s",
".".join(map(str, MIN_IRONIC_VERSION)))
return MIN_IRONIC_VERSION
return self._ironic_api_version
def heartbeat(self, uuid, advertise_address):
path = self.heartbeat_api.format(uuid=uuid)
data = {'callback_url': self._get_agent_url(advertise_address)}
if self._get_ironic_api_version() >= AGENT_VERSION_IRONIC_VERSION:
data['agent_version'] = version.version_info.release_string()
headers = self._get_ironic_api_version_header(
AGENT_VERSION_IRONIC_VERSION)
else:
headers = self._get_ironic_api_version_header()
try:
response = self._request('POST', path, data=data, headers=headers)
except Exception as e:
raise errors.HeartbeatError(str(e))
if response.status_code == requests.codes.CONFLICT:
data = jsonutils.loads(response.content)
raise errors.HeartbeatConflictError(data.get('faultstring'))
elif response.status_code != requests.codes.ACCEPTED:
msg = 'Invalid status code: {}'.format(response.status_code)
raise errors.HeartbeatError(msg)
def lookup_node(self, hardware_info, timeout, starting_interval,
node_uuid=None):
timer = loopingcall.BackOffLoopingCall(
self._do_lookup,
hardware_info=hardware_info,
node_uuid=node_uuid)
try:
node_content = timer.start(starting_interval=starting_interval,
timeout=timeout).wait()
except loopingcall.LoopingCallTimeOut:
raise errors.LookupNodeError('Could not look up node info. Check '
'logs for details.')
return node_content
def _do_lookup(self, hardware_info, node_uuid):
"""The actual call to lookup a node.
Should be called as a `loopingcall.BackOffLoopingCall`.
"""
params = {
'addresses': ','.join(iface.mac_address
for iface in hardware_info['interfaces']
if iface.mac_address)
}
if node_uuid:
params['node_uuid'] = node_uuid
try:
response = self._request(
'GET', self.lookup_api,
headers=self._get_ironic_api_version_header(),
params=params)
except Exception as err:
LOG.exception(
'Unhandled error looking up node with addresses %r at %s: %s',
params['addresses'], self.api_url, err,
)
return False
if response.status_code != requests.codes.OK:
LOG.warning(
'Failed looking up node with addresses %r at %s, '
'status code: %s',
params['addresses'], self.api_url, response.status_code,
)
return False
try:
content = jsonutils.loads(response.content)
except Exception as e:
LOG.warning('Error decoding response: %s', e)
return False
# Check for valid response data
if 'node' not in content or 'uuid' not in content['node']:
LOG.warning(
'Got invalid node data in response to query for node '
'with addresses %r from %s: %s',
params['addresses'], self.api_url, content,
)
return False
if 'config' not in content:
# Old API
try:
content['config'] = {'heartbeat_timeout':
content.pop('heartbeat_timeout')}
except KeyError:
LOG.warning('Got invalid heartbeat from the API: %s', content)
return False
# Got valid content
raise loopingcall.LoopingCallDone(retvalue=content)
def _get_agent_url(self, advertise_address):
return 'http://{}:{}'.format(netutils.wrap_ipv6(advertise_address[0]),
advertise_address[1])