162 lines
6.4 KiB
Python
162 lines
6.4 KiB
Python
# coding=utf-8
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#
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# Copyright 2014 Hewlett-Packard Development Company, L.P.
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# All Rights Reserved.
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#
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# 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 time
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from oslo_config import cfg
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from oslo_log import log as logging
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from oslo_utils import importutils
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from nova import exception
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from nova.i18n import _
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LOG = logging.getLogger(__name__)
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CONF = cfg.CONF
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ironic = None
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class IronicClientWrapper(object):
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"""Ironic client wrapper class that encapsulates retry logic."""
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def __init__(self):
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"""Initialise the IronicClientWrapper for use.
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Initialise IronicClientWrapper by loading ironicclient
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dynamically so that ironicclient is not a dependency for
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Nova.
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"""
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global ironic
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if ironic is None:
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ironic = importutils.import_module('ironicclient')
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# NOTE(deva): work around a lack of symbols in the current version.
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if not hasattr(ironic, 'exc'):
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ironic.exc = importutils.import_module('ironicclient.exc')
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if not hasattr(ironic, 'client'):
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ironic.client = importutils.import_module(
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'ironicclient.client')
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self._cached_client = None
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def _invalidate_cached_client(self):
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"""Tell the wrapper to invalidate the cached ironic-client."""
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self._cached_client = None
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def _get_client(self, retry_on_conflict=True):
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max_retries = CONF.ironic.api_max_retries if retry_on_conflict else 1
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retry_interval = (CONF.ironic.api_retry_interval
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if retry_on_conflict else 0)
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# If we've already constructed a valid, authed client, just return
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# that.
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if retry_on_conflict and self._cached_client is not None:
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return self._cached_client
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auth_token = CONF.ironic.admin_auth_token
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if auth_token is None:
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kwargs = {'os_username': CONF.ironic.admin_username,
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'os_password': CONF.ironic.admin_password,
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'os_auth_url': CONF.ironic.admin_url,
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'os_tenant_name': CONF.ironic.admin_tenant_name,
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'os_service_type': 'baremetal',
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'os_endpoint_type': 'public',
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'ironic_url': CONF.ironic.api_endpoint}
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else:
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kwargs = {'os_auth_token': auth_token,
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'ironic_url': CONF.ironic.api_endpoint}
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# Retries for Conflict exception
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kwargs['max_retries'] = max_retries
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kwargs['retry_interval'] = retry_interval
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try:
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cli = ironic.client.get_client(CONF.ironic.api_version, **kwargs)
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# Cache the client so we don't have to reconstruct and
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# reauthenticate it every time we need it.
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if retry_on_conflict:
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self._cached_client = cli
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except ironic.exc.Unauthorized:
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msg = _("Unable to authenticate Ironic client.")
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LOG.error(msg)
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raise exception.NovaException(msg)
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return cli
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def _multi_getattr(self, obj, attr):
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"""Support nested attribute path for getattr().
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:param obj: Root object.
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:param attr: Path of final attribute to get. E.g., "a.b.c.d"
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:returns: The value of the final named attribute.
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:raises: AttributeError will be raised if the path is invalid.
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"""
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for attribute in attr.split("."):
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obj = getattr(obj, attribute)
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return obj
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def call(self, method, *args, **kwargs):
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"""Call an Ironic client method and retry on errors.
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:param method: Name of the client method to call as a string.
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:param args: Client method arguments.
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:param kwargs: Client method keyword arguments.
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:param retry_on_conflict: Boolean value. Whether the request should be
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retried in case of a conflict error
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(HTTP 409) or not. If retry_on_conflict is
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False the cached instance of the client
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won't be used. Defaults to True.
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:raises: NovaException if all retries failed.
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"""
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# TODO(dtantsur): drop these once ironicclient 0.8.0 is out and used in
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# global-requirements.
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retry_excs = (ironic.exc.ServiceUnavailable,
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ironic.exc.ConnectionRefused)
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retry_on_conflict = kwargs.pop('retry_on_conflict', True)
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# num_attempts should be the times of retry + 1
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# eg. retry==0 just means run once and no retry
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num_attempts = max(0, CONF.ironic.api_max_retries) + 1
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for attempt in range(1, num_attempts + 1):
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client = self._get_client(retry_on_conflict=retry_on_conflict)
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try:
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return self._multi_getattr(client, method)(*args, **kwargs)
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except ironic.exc.Unauthorized:
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# In this case, the authorization token of the cached
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# ironic-client probably expired. So invalidate the cached
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# client and the next try will start with a fresh one.
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self._invalidate_cached_client()
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LOG.debug("The Ironic client became unauthorized. "
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"Will attempt to reauthorize and try again.")
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except retry_excs:
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pass
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# We want to perform this logic for all exception cases listed
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# above.
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msg = (_("Error contacting Ironic server for "
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"'%(method)s'. Attempt %(attempt)d of %(total)d") %
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{'method': method,
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'attempt': attempt,
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'total': num_attempts})
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if attempt == num_attempts:
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LOG.error(msg)
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raise exception.NovaException(msg)
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LOG.warning(msg)
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time.sleep(CONF.ironic.api_retry_interval)
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