109 lines
4.3 KiB
Python
109 lines
4.3 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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import six
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from nova import conductor
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from nova import context
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from nova.openstack.common.gettextutils import _
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from nova.openstack.common import log as logging
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from nova.openstack.common import timeutils
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from gantt.servicegroup import api
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CONF = cfg.CONF
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CONF.import_opt('service_down_time', 'gantt.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, {'member_id': member_id, 'group_id': group_id,
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'service': service})
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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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service.tg.add_timer(report_interval, self._report_state,
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report_interval, service)
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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, six.string_types):
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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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else:
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# Objects have proper UTC timezones, but the timeutils comparison
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# below does not (and will fail)
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last_heartbeat = last_heartbeat.replace(tzinfo=None)
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# Timestamps in DB are UTC.
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elapsed = timeutils.delta_seconds(last_heartbeat, timeutils.utcnow())
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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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