bd25174338
Using DynamicLoopingCall involved a few hacks to make it work properly. This new BackOffLoopingCall will start an exponential backoff (with a configurable jitter) when there is a failure. The backoff will continue until the given function returns True or timeout is about to be exceeded. The function will run indefinitely until either an exception is raised or timeout is reached. I plan to merge this into oslo loopingcall and switch the heartbeat to this. Change-Id: I1482348e98c6b68c34b3003645029e08135b1341
140 lines
4.8 KiB
Python
140 lines
4.8 KiB
Python
"""
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Copyright 2013 Rackspace, Inc.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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"""
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import json
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import requests
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from ironic_python_agent import backoff
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from ironic_python_agent import encoding
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from ironic_python_agent import errors
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from ironic_python_agent.openstack.common import log
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from ironic_python_agent.openstack.common import loopingcall
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LOG = log.getLogger(__name__)
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class APIClient(object):
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api_version = 'v1'
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def __init__(self, api_url):
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self.api_url = api_url.rstrip('/')
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self.session = requests.Session()
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self.encoder = encoding.RESTJSONEncoder()
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self.log = log.getLogger(__name__)
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def _request(self, method, path, data=None):
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request_url = '{api_url}{path}'.format(api_url=self.api_url, path=path)
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if data is not None:
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data = self.encoder.encode(data)
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request_headers = {
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'Content-Type': 'application/json',
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'Accept': 'application/json',
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}
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return self.session.request(method,
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request_url,
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headers=request_headers,
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data=data)
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def heartbeat(self, uuid, advertise_address):
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path = '/{api_version}/nodes/{uuid}/vendor_passthru/heartbeat'.format(
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api_version=self.api_version,
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uuid=uuid
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)
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data = {
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'agent_url': self._get_agent_url(advertise_address)
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}
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try:
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response = self._request('POST', path, data=data)
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except Exception as e:
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raise errors.HeartbeatError(str(e))
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if response.status_code != requests.codes.NO_CONTENT:
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msg = 'Invalid status code: {0}'.format(response.status_code)
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raise errors.HeartbeatError(msg)
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try:
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return float(response.headers['Heartbeat-Before'])
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except KeyError:
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raise errors.HeartbeatError('Missing Heartbeat-Before header')
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except Exception:
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raise errors.HeartbeatError('Invalid Heartbeat-Before header')
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def lookup_node(self, hardware_info, timeout, starting_interval):
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timer = backoff.BackOffLoopingCall(
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self._do_lookup,
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hardware_info=hardware_info)
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try:
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node_content = timer.start(starting_interval=starting_interval,
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timeout=timeout).wait()
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except backoff.LoopingCallTimeOut:
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raise errors.LookupNodeError('Could not look up node info. Check '
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'logs for details.')
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return node_content
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def _do_lookup(self, hardware_info):
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"""The actual call to lookup a node. Should be called inside
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loopingcall.BackOffLoopingCall.
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"""
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path = '/{api_version}/drivers/teeth/vendor_passthru/lookup'.format(
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api_version=self.api_version
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)
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# This hardware won't be saved on the node currently, because of
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# how driver_vendor_passthru is implemented (no node saving).
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data = {
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'hardware': hardware_info
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}
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# Make the POST, make sure we get back normal data/status codes and
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# content
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try:
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response = self._request('POST', path, data=data)
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except Exception as e:
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self.log.warning('POST failed: %s' % str(e))
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return False
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if response.status_code != requests.codes.OK:
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self.log.warning('Invalid status code: %s' % response.status_code)
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return False
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try:
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content = json.loads(response.content)
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except Exception as e:
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self.log.warning('Error decoding response: %s' % str(e))
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return False
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# Check for valid response data
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if 'node' not in content or 'uuid' not in content['node']:
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self.log.warning('Got invalid node data from the API: %s' %
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content)
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return False
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if 'heartbeat_timeout' not in content:
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self.log.warning('Got invalid heartbeat from the API: %s' %
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content)
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return False
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# Got valid content
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raise loopingcall.LoopingCallDone(retvalue=content)
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def _get_agent_url(self, advertise_address):
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return 'http://{0}:{1}'.format(advertise_address[0],
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advertise_address[1])
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