8c53d87ad9
Import the oslo looping call implementation (which is a copy of nova's), delete nova's local copy, convert all users to the new location. It should be noted that the oslo implementation of FixedIntervalLoopingCall measures time from the start of the periodic task, not the end, so periodic tasks will run with a constant frequency instead of the frequency changing depending on how long the periodic task takes to run. Change-Id: Ia62ce1988f5373c09146efa6b3b1d1dc094d50c4
106 lines
4.2 KiB
Python
106 lines
4.2 KiB
Python
# Copyright 2012 IBM Corp.
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#
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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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#
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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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# 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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from oslo.config import cfg
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from nova import conductor
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from nova import context
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from nova.openstack.common import log as logging
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from nova.openstack.common import loopingcall
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from nova.openstack.common import timeutils
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from nova.servicegroup import api
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from nova import utils
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CONF = cfg.CONF
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CONF.import_opt('service_down_time', 'nova.service')
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LOG = logging.getLogger(__name__)
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class DbDriver(api.ServiceGroupDriver):
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def __init__(self, *args, **kwargs):
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self.db_allowed = kwargs.get('db_allowed', True)
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self.conductor_api = conductor.API(use_local=self.db_allowed)
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def join(self, member_id, group_id, service=None):
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"""Join the given service with it's group."""
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msg = _('DB_Driver: join new ServiceGroup member %(member_id)s to '
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'the %(group_id)s group, service = %(service)s')
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LOG.debug(msg, locals())
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if service is None:
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raise RuntimeError(_('service is a mandatory argument for DB based'
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' ServiceGroup driver'))
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report_interval = service.report_interval
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if report_interval:
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pulse = loopingcall.FixedIntervalLoopingCall(self._report_state,
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service)
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pulse.start(interval=report_interval,
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initial_delay=report_interval)
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return pulse
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def is_up(self, service_ref):
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"""Moved from nova.utils
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Check whether a service is up based on last heartbeat.
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"""
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last_heartbeat = service_ref['updated_at'] or service_ref['created_at']
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if isinstance(last_heartbeat, basestring):
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# NOTE(russellb) If this service_ref came in over rpc via
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# conductor, then the timestamp will be a string and needs to be
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# converted back to a datetime.
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last_heartbeat = timeutils.parse_strtime(last_heartbeat)
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# Timestamps in DB are UTC.
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elapsed = utils.total_seconds(timeutils.utcnow() - last_heartbeat)
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LOG.debug('DB_Driver.is_up last_heartbeat = %(lhb)s elapsed = %(el)s',
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{'lhb': str(last_heartbeat), 'el': str(elapsed)})
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return abs(elapsed) <= CONF.service_down_time
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def get_all(self, group_id):
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"""
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Returns ALL members of the given group
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"""
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LOG.debug(_('DB_Driver: get_all members of the %s group') % group_id)
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rs = []
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ctxt = context.get_admin_context()
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services = self.conductor_api.service_get_all_by_topic(ctxt, group_id)
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for service in services:
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if self.is_up(service):
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rs.append(service['host'])
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return rs
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def _report_state(self, service):
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"""Update the state of this service in the datastore."""
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ctxt = context.get_admin_context()
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state_catalog = {}
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try:
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report_count = service.service_ref['report_count'] + 1
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state_catalog['report_count'] = report_count
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service.service_ref = self.conductor_api.service_update(ctxt,
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service.service_ref, state_catalog)
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# TODO(termie): make this pattern be more elegant.
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if getattr(service, 'model_disconnected', False):
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service.model_disconnected = False
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LOG.error(_('Recovered model server connection!'))
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# TODO(vish): this should probably only catch connection errors
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except Exception: # pylint: disable=W0702
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if not getattr(service, 'model_disconnected', False):
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service.model_disconnected = True
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LOG.exception(_('model server went away'))
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