Source code for watcher.api.scheduling
# -*- encoding: utf-8 -*-
# Copyright (c) 2017 Servionica
#
# 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.
import datetime
from oslo_config import cfg
from oslo_log import log
from oslo_utils import timeutils
import six
from watcher._i18n import _LW
from watcher.common import context as watcher_context
from watcher.common import scheduling
from watcher import notifications
from watcher import objects
CONF = cfg.CONF
LOG = log.getLogger(__name__)
[docs]class APISchedulingService(scheduling.BackgroundSchedulerService):
def __init__(self, gconfig=None, **options):
self.services_status = {}
gconfig = None or {}
super(APISchedulingService, self).__init__(gconfig, **options)
[docs] def get_services_status(self, context):
services = objects.service.Service.list(context)
for service in services:
result = self.get_service_status(context, service.id)
if service.id not in self.services_status.keys():
self.services_status[service.id] = result
continue
if self.services_status[service.id] != result:
self.services_status[service.id] = result
notifications.service.send_service_update(context, service,
state=result)
[docs] def get_service_status(self, context, service_id):
service = objects.Service.get(context, service_id)
last_heartbeat = (service.last_seen_up or service.updated_at
or service.created_at)
if isinstance(last_heartbeat, six.string_types):
# NOTE(russellb) If this service came in over rpc via
# conductor, then the timestamp will be a string and needs to be
# converted back to a datetime.
last_heartbeat = timeutils.parse_strtime(last_heartbeat)
else:
# Objects have proper UTC timezones, but the timeutils comparison
# below does not (and will fail)
last_heartbeat = last_heartbeat.replace(tzinfo=None)
elapsed = timeutils.delta_seconds(last_heartbeat, timeutils.utcnow())
is_up = abs(elapsed) <= CONF.service_down_time
if not is_up:
LOG.warning(_LW('Seems service %(name)s on host %(host)s is down. '
'Last heartbeat was %(lhb)s.'
'Elapsed time is %(el)s'),
{'name': service.name,
'host': service.host,
'lhb': str(last_heartbeat), 'el': str(elapsed)})
return objects.service.ServiceStatus.FAILED
return objects.service.ServiceStatus.ACTIVE
[docs] def start(self):
"""Start service."""
context = watcher_context.make_context(is_admin=True)
self.add_job(self.get_services_status, name='service_status',
trigger='interval', jobstore='default', args=[context],
next_run_time=datetime.datetime.now(), seconds=60)
super(APISchedulingService, self).start()
[docs] def stop(self):
"""Stop service."""
self.shutdown()
[docs] def wait(self):
"""Wait for service to complete."""
[docs] def reset(self):
"""Reset service.
Called in case service running in daemon mode receives SIGHUP.
"""