786 lines
30 KiB
Python
786 lines
30 KiB
Python
# Copyright 2014 eBay Inc.
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#
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# Author: Ron Rickard <rrickard@ebaysf.com>
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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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from contextlib import contextmanager
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from decimal import Decimal
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import time
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from oslo_config import cfg
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import oslo_messaging as messaging
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from oslo_log import log as logging
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from oslo_concurrency import lockutils
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from designate import backend
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from designate import coordination
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from designate import exceptions
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from designate import objects
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from designate import utils
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from designate.central import rpcapi as central_api
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from designate.mdns import rpcapi as mdns_api
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from designate import service
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from designate.context import DesignateContext
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from designate.i18n import _LE
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from designate.i18n import _LI
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from designate.i18n import _LW
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from designate.pool_manager import cache
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LOG = logging.getLogger(__name__)
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CONF = cfg.CONF
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SUCCESS_STATUS = 'SUCCESS'
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ERROR_STATUS = 'ERROR'
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NO_ZONE_STATUS = 'NO_ZONE'
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CREATE_ACTION = 'CREATE'
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DELETE_ACTION = 'DELETE'
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UPDATE_ACTION = 'UPDATE'
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MAXIMUM_THRESHOLD = 100
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@contextmanager
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def wrap_backend_call():
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"""
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Wraps backend calls, ensuring any exception raised is a Backend exception.
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"""
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try:
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yield
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except exceptions.Backend:
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raise
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except Exception as e:
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raise exceptions.Backend('Unknown backend failure: %r' % e)
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def _constant_retries(num_attempts, sleep_interval):
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"""Generate a sequence of False terminated by a True
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Sleep `sleep_interval` between cycles but not at the end.
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"""
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for cnt in range(num_attempts):
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if cnt != 0:
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LOG.debug(_LI("Executing retry n. %d"), cnt)
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if cnt < num_attempts - 1:
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yield False
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time.sleep(sleep_interval)
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else:
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yield True
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class Service(service.RPCService, coordination.CoordinationMixin,
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service.Service):
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"""
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Service side of the Pool Manager RPC API.
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API version history:
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1.0 - Initial version
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"""
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RPC_API_VERSION = '2.0'
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target = messaging.Target(version=RPC_API_VERSION)
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def __init__(self, threads=None):
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super(Service, self).__init__(threads=threads)
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# Build the Pool (and related) Object from Config
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self.pool = objects.Pool.from_config(
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CONF, CONF['service:pool_manager'].pool_id)
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# Get a pool manager cache connection.
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self.cache = cache.get_pool_manager_cache(
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CONF['service:pool_manager'].cache_driver)
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# Store some settings for quick access later
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self.threshold = CONF['service:pool_manager'].threshold_percentage
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self.timeout = CONF['service:pool_manager'].poll_timeout
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self.retry_interval = CONF['service:pool_manager'].poll_retry_interval
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self.max_retries = CONF['service:pool_manager'].poll_max_retries
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self.delay = CONF['service:pool_manager'].poll_delay
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self._periodic_sync_max_attempts = \
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CONF['service:pool_manager'].periodic_sync_max_attempts
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self._periodic_sync_retry_interval = \
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CONF['service:pool_manager'].periodic_sync_retry_interval
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# Create the necessary Backend instances for each target
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self._setup_target_backends()
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def _setup_target_backends(self):
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self.target_backends = {}
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for target in self.pool.targets:
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# Fetch an instance of the Backend class, passing in the options
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# and masters
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self.target_backends[target.id] = backend.get_backend(
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target.type, target)
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LOG.info(_LI('%d targets setup'), len(self.pool.targets))
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if not self.target_backends:
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raise exceptions.NoPoolTargetsConfigured()
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@property
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def service_name(self):
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return 'pool_manager'
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@property
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def _rpc_topic(self):
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# Modify the default topic so it's pool manager instance specific.
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topic = super(Service, self)._rpc_topic
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topic = '%s.%s' % (topic, CONF['service:pool_manager'].pool_id)
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LOG.info(_LI('Using topic %(topic)s for this pool manager instance.'),
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{'topic': topic})
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return topic
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def start(self):
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for target in self.pool.targets:
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self.target_backends[target.id].start()
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super(Service, self).start()
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# Setup a Leader Election, use for ensuring certain tasks are executed
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# on exactly one pool-manager instance at a time]
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self._pool_election = coordination.LeaderElection(
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self._coordinator, '%s:%s' % (self.service_name, self.pool.id))
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self._pool_election.start()
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if CONF['service:pool_manager'].enable_recovery_timer:
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interval = CONF['service:pool_manager'].periodic_recovery_interval
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LOG.info(_LI('Starting periodic recovery timer every'
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' %(interval)s s') % {'interval': interval})
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self.tg.add_timer(interval, self.periodic_recovery, interval)
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if CONF['service:pool_manager'].enable_sync_timer:
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interval = CONF['service:pool_manager'].periodic_sync_interval
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LOG.info(_LI('Starting periodic synchronization timer every'
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' %(interval)s s') % {'interval': interval})
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self.tg.add_timer(interval, self.periodic_sync, interval)
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def stop(self):
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self._pool_election.stop()
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super(Service, self).stop()
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for target in self.pool.targets:
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self.target_backends[target.id].stop()
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@property
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def central_api(self):
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return central_api.CentralAPI.get_instance()
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@property
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def mdns_api(self):
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return mdns_api.MdnsAPI.get_instance()
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def _get_admin_context_all_tenants(self):
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return DesignateContext.get_admin_context(all_tenants=True)
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# Periodioc Tasks
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def periodic_recovery(self):
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"""
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Runs only on the pool leader
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:return: None
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"""
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if not self._pool_election.is_leader:
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return
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context = self._get_admin_context_all_tenants()
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LOG.debug("Starting Periodic Recovery")
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try:
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# Handle Deletion Failures
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zones = self._get_failed_zones(context, DELETE_ACTION)
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LOG.info(_LI("periodic_recovery:delete_zone needed on %d zones"),
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len(zones))
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for zone in zones:
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self.delete_zone(context, zone)
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# Handle Creation Failures
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zones = self._get_failed_zones(context, CREATE_ACTION)
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LOG.info(_LI("periodic_recovery:create_zone needed on %d zones"),
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len(zones))
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for zone in zones:
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self.create_zone(context, zone)
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# Handle Update Failures
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zones = self._get_failed_zones(context, UPDATE_ACTION)
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LOG.info(_LI("periodic_recovery:update_zone needed on %d zones"),
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len(zones))
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for zone in zones:
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self.update_zone(context, zone)
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except Exception:
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LOG.exception(_LE('An unhandled exception in periodic '
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'recovery occurred'))
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def periodic_sync(self):
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"""Periodically sync all the zones that are not in ERROR status
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Runs only on the pool leader
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:return: None
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"""
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if not self._pool_election.is_leader:
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return
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LOG.debug("Starting Periodic Synchronization")
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context = self._get_admin_context_all_tenants()
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zones = self._fetch_healthy_zones(context)
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zones = set(zones)
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# TODO(kiall): If the zone was created within the last
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# periodic_sync_seconds, attempt to recreate
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# to fill in targets which may have failed.
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retry_gen = _constant_retries(
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self._periodic_sync_max_attempts,
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self._periodic_sync_retry_interval
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)
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for is_last_cycle in retry_gen:
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zones_in_error = []
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for zone in zones:
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try:
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success = self.update_zone(context, zone)
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if not success:
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zones_in_error.append(zone)
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except Exception:
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LOG.exception(_LE('An unhandled exception in periodic '
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'synchronization occurred.'))
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zones_in_error.append(zone)
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if not zones_in_error:
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return
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zones = zones_in_error
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for zone in zones_in_error:
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self.central_api.update_status(context, zone.id, ERROR_STATUS,
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zone.serial)
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# Standard Create/Update/Delete Methods
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def create_zone(self, context, zone):
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"""Called by Central or by periodic_recovery, instruct the backends to
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create a zone, then poll for consensus.
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On success, send NOTIFY to also_notifies and nameservers
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Finally, poll for zone serial number on nameservers.
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:param context: Security context information.
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:param zone: Zone to be created
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:return: None
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"""
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LOG.info(_LI("Creating new zone %s"), zone.name)
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results = []
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# Create the zone on each of the Pool Targets
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for target in self.pool.targets:
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results.append(
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self._create_zone_on_target(context, target, zone)
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)
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if self._exceed_or_meet_threshold(results.count(True)):
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LOG.debug('Consensus reached for creating zone %(zone)s '
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'on pool targets' % {'zone': zone.name})
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# The zone status will be updated asyncronously by MiniDNS
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else:
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LOG.warning(_LW('Consensus not reached for creating zone %(zone)s'
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' on pool targets') % {'zone': zone.name})
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self.central_api.update_status(
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context, zone.id, ERROR_STATUS, zone.serial)
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return
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# Send a NOTIFY to each also-notifies
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for also_notify in self.pool.also_notifies:
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self._update_zone_on_also_notify(context, also_notify, zone)
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# Send a NOTIFY to each nameserver
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for nameserver in self.pool.nameservers:
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create_status = self._build_status_object(
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nameserver, zone, CREATE_ACTION)
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self.cache.store(context, create_status)
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self.mdns_api.poll_for_serial_number(
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context, zone, nameserver, self.timeout,
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self.retry_interval, self.max_retries, self.delay)
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def _create_zone_on_target(self, context, target, zone):
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"""Called by create_zone, run create_zone on backends
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:param context: Security context information.
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:param target: Target to create Zone on
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:param zone: Zone to be created
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:return: True/False
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"""
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LOG.debug("Creating zone %s on target %s", zone.name, target.id)
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backend = self.target_backends[target.id]
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retries = 0
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while retries < self.max_retries:
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try:
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backend.create_zone(context, zone)
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return True
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except Exception:
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retries += 1
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LOG.exception(_LE(
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"Failed to create zone %(zone)s on "
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"target %(target)s on attempt %(attempt)d"),
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{
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'zone': zone.name,
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'target': target.id,
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'attempt': retries
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}) # noqa
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time.sleep(self.retry_interval)
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return False
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def update_zone(self, context, zone):
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"""Update a zone across every pool target, check for consensus and
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for propagation.
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:param context: Security context information.
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:param zone: Zone to be updated
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:return: consensus reached (bool)
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"""
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LOG.info(_LI("Updating zone %s"), zone.name)
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# Update the zone on each of the Pool Targets
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success_count = 0
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for target in self.pool.targets:
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ok_status = self._update_zone_on_target(context, target, zone)
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if ok_status:
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success_count += 1
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if not self._exceed_or_meet_threshold(success_count):
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LOG.warning(_LW('Consensus not reached for updating zone %(zone)s'
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' on pool targets') % {'zone': zone.name})
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self.central_api.update_status(context, zone.id, ERROR_STATUS,
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zone.serial)
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return False
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LOG.debug('Consensus reached for updating zone %(zone)s '
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'on pool targets' % {'zone': zone.name})
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# The zone status will be updated asyncronously by MiniDNS
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# Send a NOTIFY to each also-notifies
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for also_notify in self.pool.also_notifies:
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self._update_zone_on_also_notify(context, also_notify, zone)
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# Ensure the change has propogated to each nameserver
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for nameserver in self.pool.nameservers:
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# See if there is already another update in progress
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try:
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self.cache.retrieve(context, nameserver.id, zone.id,
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UPDATE_ACTION)
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except exceptions.PoolManagerStatusNotFound:
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update_status = self._build_status_object(
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nameserver, zone, UPDATE_ACTION)
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self.cache.store(context, update_status)
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self.mdns_api.poll_for_serial_number(
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context, zone, nameserver, self.timeout,
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self.retry_interval, self.max_retries, self.delay)
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return True
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def _update_zone_on_target(self, context, target, zone):
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"""Instruct the appropriate backend to update a zone on a target
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:param context: Security context information.
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:param target: Target to update Zone on
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:param zone: Zone to be updated
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:return: True/False
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"""
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LOG.debug("Updating zone %s on target %s", zone.name, target.id)
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backend = self.target_backends[target.id]
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try:
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backend.update_zone(context, zone)
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return True
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except Exception:
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LOG.exception(_LE("Failed to update zone %(zone)s on target "
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"%(target)s"),
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{'zone': zone.name, 'target': target.id})
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return False
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def _update_zone_on_also_notify(self, context, also_notify, zone):
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LOG.info(_LI('Updating zone %(zone)s on also_notify %(server)s.'),
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{'zone': zone.name,
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'server': self._get_destination(also_notify)})
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self.mdns_api.notify_zone_changed(
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context, zone, also_notify.host, also_notify.port, self.timeout,
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self.retry_interval, self.max_retries, 0)
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def delete_zone(self, context, zone):
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"""
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:param context: Security context information.
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:param zone: Zone to be deleted
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:return: None
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"""
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LOG.info(_LI("Deleting zone %s"), zone.name)
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results = []
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# Delete the zone on each of the Pool Targets
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for target in self.pool.targets:
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results.append(
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self._delete_zone_on_target(context, target, zone))
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# TODO(kiall): We should monitor that the Zone is actually deleted
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# correctly on each of the nameservers, rather than
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# assuming a successful delete-on-target is OK as we have
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# in the past.
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if self._exceed_or_meet_threshold(
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results.count(True), MAXIMUM_THRESHOLD):
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LOG.debug('Consensus reached for deleting zone %(zone)s '
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'on pool targets' % {'zone': zone.name})
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self.central_api.update_status(
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context, zone.id, SUCCESS_STATUS, zone.serial)
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else:
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LOG.warning(_LW('Consensus not reached for deleting zone %(zone)s'
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' on pool targets') % {'zone': zone.name})
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self.central_api.update_status(
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context, zone.id, ERROR_STATUS, zone.serial)
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def _delete_zone_on_target(self, context, target, zone):
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"""
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:param context: Security context information.
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:param target: Target to delete Zone from
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:param zone: Zone to be deleted
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:return: True/False
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"""
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LOG.debug("Deleting zone %s on target %s", zone.name, target.id)
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backend = self.target_backends[target.id]
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retries = 0
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while retries < self.max_retries:
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try:
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backend.delete_zone(context, zone)
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return True
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except Exception:
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retries += 1
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LOG.exception(_LE(
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"Failed to delete zone %(zone)s on "
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"target %(target)s on attempt %(attempt)d"),
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{
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'zone': zone.name,
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'target': target.id,
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'attempt': retries
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})
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time.sleep(self.retry_interval)
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return False
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def update_status(self, context, zone, nameserver, status,
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actual_serial):
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"""
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update_status is called by mdns for creates and updates.
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deletes are handled by the backend entirely and status is determined
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at the time of delete itself.
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:param context: Security context information.
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:param zone: The designate zone object.
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:param nameserver: The nameserver for which a status update is being
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sent.
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:param status: The status, 'SUCCESS' or 'ERROR'.
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:param actual_serial: The actual serial number received from the name
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server for the zone.
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:return: None
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"""
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LOG.debug("Calling update_status for %s : %s : %s : %s" %
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(zone.name, zone.action, status, actual_serial))
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action = UPDATE_ACTION if zone.action == 'NONE' else zone.action
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with lockutils.lock('update-status-%s' % zone.id):
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try:
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current_status = self.cache.retrieve(
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context, nameserver.id, zone.id, action)
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except exceptions.PoolManagerStatusNotFound:
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current_status = self._build_status_object(
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nameserver, zone, action)
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self.cache.store(context, current_status)
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cache_serial = current_status.serial_number
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LOG.debug('For zone %s : %s on nameserver %s the cache serial '
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'is %s and the actual serial is %s.' %
|
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(zone.name, action,
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self._get_destination(nameserver),
|
|
cache_serial, actual_serial))
|
|
if actual_serial and cache_serial <= actual_serial:
|
|
current_status.status = status
|
|
current_status.serial_number = actual_serial
|
|
self.cache.store(context, current_status)
|
|
|
|
consensus_serial = self._get_consensus_serial(context, zone)
|
|
|
|
# If there is a valid consensus serial we can still send a success
|
|
# for that serial.
|
|
# If there is a higher error serial we can also send an error for
|
|
# the error serial.
|
|
if consensus_serial != 0 and cache_serial <= consensus_serial \
|
|
and zone.status != 'ACTIVE':
|
|
LOG.info(_LI('For zone %(zone)s '
|
|
'the consensus serial is %(consensus_serial)s.'),
|
|
{'zone': zone.name,
|
|
'consensus_serial': consensus_serial})
|
|
self.central_api.update_status(
|
|
context, zone.id, SUCCESS_STATUS, consensus_serial)
|
|
|
|
if status == ERROR_STATUS:
|
|
error_serial = self._get_error_serial(
|
|
context, zone, consensus_serial)
|
|
if error_serial > consensus_serial or error_serial == 0:
|
|
LOG.warning(_LW('For zone %(zone)s '
|
|
'the error serial is %(error_serial)s.') %
|
|
{'zone': zone.name,
|
|
'error_serial': error_serial})
|
|
self.central_api.update_status(
|
|
context, zone.id, ERROR_STATUS, error_serial)
|
|
|
|
if status == NO_ZONE_STATUS and action != DELETE_ACTION:
|
|
LOG.warning(_LW('Zone %(zone)s is not present in some '
|
|
'targets') % {'zone': zone.name})
|
|
self.central_api.update_status(
|
|
context, zone.id, NO_ZONE_STATUS, 0)
|
|
|
|
if consensus_serial == zone.serial and self._is_consensus(
|
|
context, zone, action, SUCCESS_STATUS,
|
|
MAXIMUM_THRESHOLD):
|
|
self._clear_cache(context, zone, action)
|
|
|
|
# Utility Methods
|
|
def _get_failed_zones(self, context, action):
|
|
criterion = {
|
|
'pool_id': CONF['service:pool_manager'].pool_id,
|
|
'action': action,
|
|
'status': ERROR_STATUS
|
|
}
|
|
return self.central_api.find_zones(context, criterion)
|
|
|
|
def _fetch_healthy_zones(self, context):
|
|
"""Fetch all zones not in error
|
|
:return: :class:`ZoneList` zones
|
|
"""
|
|
criterion = {
|
|
'pool_id': CONF['service:pool_manager'].pool_id,
|
|
'status': '!%s' % ERROR_STATUS
|
|
}
|
|
|
|
periodic_sync_seconds = \
|
|
CONF['service:pool_manager'].periodic_sync_seconds
|
|
|
|
if periodic_sync_seconds is not None:
|
|
# Generate the current serial, will provide a UTC Unix TS.
|
|
current = utils.increment_serial()
|
|
criterion['serial'] = ">%s" % (current - periodic_sync_seconds)
|
|
|
|
zones = self.central_api.find_zones(context, criterion)
|
|
return zones
|
|
|
|
@staticmethod
|
|
def _get_destination(nameserver):
|
|
return '%s:%s' % (nameserver.host, nameserver.port)
|
|
|
|
@staticmethod
|
|
def _percentage(count, total_count):
|
|
return (Decimal(count) / Decimal(total_count)) * Decimal(100)
|
|
|
|
def _exceed_or_meet_threshold(self, count, threshold=None):
|
|
"""Evaluate if count / the number of pool targets >= threshold
|
|
Used to implement consensus
|
|
"""
|
|
threshold = threshold or self.threshold
|
|
perc = self._percentage(count, len(self.pool.targets))
|
|
return perc >= Decimal(threshold)
|
|
|
|
@staticmethod
|
|
def _get_sorted_serials(pool_manager_statuses, descending=False):
|
|
serials = []
|
|
for pool_manager_status in pool_manager_statuses:
|
|
serials.append(pool_manager_status.serial_number)
|
|
serials.sort(reverse=descending)
|
|
return serials
|
|
|
|
def _get_serials_ascending(self, pool_manager_statuses):
|
|
return self._get_sorted_serials(pool_manager_statuses)
|
|
|
|
def _get_serials_descending(self, pool_manager_statuses):
|
|
return self._get_sorted_serials(pool_manager_statuses, descending=True)
|
|
|
|
def _is_consensus(self, context, zone, action, status, threshold=None):
|
|
"""Fetch zone status across all nameservers through MiniDNS and compare
|
|
it with the expected `status`
|
|
:return: consensus reached (bool)
|
|
"""
|
|
status_count = 0
|
|
pool_manager_statuses = self._retrieve_statuses(
|
|
context, zone, action)
|
|
for pool_manager_status in pool_manager_statuses:
|
|
if pool_manager_status.status == status:
|
|
status_count += 1
|
|
if threshold is None:
|
|
threshold = self.threshold
|
|
return self._exceed_or_meet_threshold(status_count, threshold)
|
|
|
|
def _get_consensus_serial(self, context, zone):
|
|
consensus_serial = 0
|
|
action = UPDATE_ACTION if zone.action == 'NONE' else zone.action
|
|
|
|
pm_statuses = self._retrieve_statuses(context, zone, action)
|
|
for serial in self._get_serials_descending(pm_statuses):
|
|
serial_count = 0
|
|
for pm_status in pm_statuses:
|
|
if pm_status.serial_number >= serial:
|
|
serial_count += 1
|
|
if self._exceed_or_meet_threshold(serial_count, self.threshold):
|
|
consensus_serial = serial
|
|
break
|
|
return consensus_serial
|
|
|
|
def _get_error_serial(self, context, zone, consensus_serial):
|
|
error_serial = 0
|
|
action = UPDATE_ACTION if zone.action == 'NONE' else zone.action
|
|
|
|
if self._is_consensus(context, zone, action, ERROR_STATUS):
|
|
pm_statuses = self._retrieve_statuses(context, zone, action)
|
|
for serial in self._get_serials_ascending(pm_statuses):
|
|
if serial > consensus_serial:
|
|
error_serial = serial
|
|
break
|
|
return error_serial
|
|
|
|
# When we hear back from the nameserver, the serial_number is set to the
|
|
# value the nameserver
|
|
@staticmethod
|
|
def _build_status_object(nameserver, zone, action):
|
|
"""
|
|
:return: :class:`objects.PoolManagerStatus`
|
|
"""
|
|
values = {
|
|
'nameserver_id': nameserver.id,
|
|
'zone_id': zone.id,
|
|
'status': None,
|
|
'serial_number': 0,
|
|
'action': action
|
|
}
|
|
return objects.PoolManagerStatus(**values)
|
|
|
|
# Methods for manipulating the cache.
|
|
def _clear_cache(self, context, zone, action=None):
|
|
LOG.debug('Clearing cache for zone %s with action %s.' %
|
|
(zone.name, action))
|
|
|
|
pool_manager_statuses = []
|
|
if action:
|
|
actions = [action]
|
|
else:
|
|
actions = [CREATE_ACTION, UPDATE_ACTION, DELETE_ACTION]
|
|
|
|
for nameserver in self.pool.nameservers:
|
|
for action in actions:
|
|
pool_manager_status = self._build_status_object(
|
|
nameserver, zone, action)
|
|
pool_manager_statuses.append(pool_manager_status)
|
|
|
|
for pool_manager_status in pool_manager_statuses:
|
|
# Ignore any not found errors while clearing the cache
|
|
try:
|
|
self.cache.clear(context, pool_manager_status)
|
|
except exceptions.PoolManagerStatusNotFound:
|
|
pass
|
|
|
|
def _retrieve_from_mdns(self, context, nameserver, zone, action):
|
|
"""Instruct MiniDNS to get a zone serial number from a nameserver
|
|
Set error status if the zone is unexpectedly missing.
|
|
:return: :class:`objects.PoolManagerStatus` or None
|
|
"""
|
|
try:
|
|
(status, actual_serial, retries) = \
|
|
self.mdns_api.get_serial_number(
|
|
context, zone, nameserver.host, nameserver.port,
|
|
self.timeout, self.retry_interval, self.max_retries,
|
|
self.delay)
|
|
except messaging.MessagingException as msg_ex:
|
|
LOG.debug('Could not retrieve status and serial for zone %s on '
|
|
'nameserver %s with action %s (%s: %s)' %
|
|
(zone.name, self._get_destination(nameserver), action,
|
|
type(msg_ex), str(msg_ex)))
|
|
return None
|
|
|
|
pool_manager_status = self._build_status_object(
|
|
nameserver, zone, action)
|
|
|
|
if status == NO_ZONE_STATUS:
|
|
if action == CREATE_ACTION:
|
|
pool_manager_status.status = ERROR_STATUS
|
|
elif action == DELETE_ACTION:
|
|
pool_manager_status.status = SUCCESS_STATUS
|
|
elif action == UPDATE_ACTION:
|
|
pool_manager_status.action = CREATE_ACTION
|
|
pool_manager_status.status = ERROR_STATUS
|
|
else:
|
|
pool_manager_status.status = status
|
|
|
|
pool_manager_status.serial_number = actual_serial or 0
|
|
LOG.debug('Retrieved status %s and serial %s for zone %s '
|
|
'on nameserver %s with action %s from mdns.' %
|
|
(pool_manager_status.status,
|
|
pool_manager_status.serial_number,
|
|
zone.name, self._get_destination(nameserver), action))
|
|
self.cache.store(context, pool_manager_status)
|
|
|
|
return pool_manager_status
|
|
|
|
def _retrieve_statuses(self, context, zone, action):
|
|
"""Instruct MiniDNS to get a zone serial number from all nameservers,
|
|
unless a cached value is available.
|
|
Set error status if the zone is unexpectedly missing.
|
|
:return: list of :class:`objects.PoolManagerStatus`
|
|
"""
|
|
pool_manager_statuses = []
|
|
for nameserver in self.pool.nameservers:
|
|
try:
|
|
pool_manager_status = self.cache.retrieve(
|
|
context, nameserver.id, zone.id, action)
|
|
LOG.debug('Cache hit! Retrieved status %s and serial %s '
|
|
'for zone %s on nameserver %s with action %s from '
|
|
'the cache.' %
|
|
(pool_manager_status.status,
|
|
pool_manager_status.serial_number,
|
|
zone.name,
|
|
self._get_destination(nameserver), action))
|
|
except exceptions.PoolManagerStatusNotFound:
|
|
LOG.debug('Cache miss! Did not retrieve status and serial '
|
|
'for zone %s on nameserver %s with action %s from '
|
|
'the cache. Getting it from the server.' %
|
|
(zone.name,
|
|
self._get_destination(nameserver),
|
|
action))
|
|
pool_manager_status = self._retrieve_from_mdns(
|
|
context, nameserver, zone, action)
|
|
|
|
if pool_manager_status is not None:
|
|
pool_manager_statuses.append(pool_manager_status)
|
|
|
|
return pool_manager_statuses
|