9ed0f90cf7
Avoid incorrect status change when deleting the pool. We can check for the conditions prior putting the pool to PENDING_DELETE state, in case delete conditions are met it is safe to change the state to PENDING_DELETE. Also, change create_vip and update_vip operations to respect PENDING_DELETE and avoid race conditions. Change-Id: I9f526901eb85bdb83cf4ff8131460eb592c900f8 Closes-Bug: #1242338
319 lines
13 KiB
Python
319 lines
13 KiB
Python
#
|
|
# Copyright 2013 Radware LTD.
|
|
#
|
|
# 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.
|
|
#
|
|
# @author: Avishay Balderman, Radware
|
|
|
|
from neutron.api.v2 import attributes as attrs
|
|
from neutron.common import exceptions as n_exc
|
|
from neutron import context
|
|
from neutron.db import api as qdbapi
|
|
from neutron.db.loadbalancer import loadbalancer_db as ldb
|
|
from neutron.db import servicetype_db as st_db
|
|
from neutron.openstack.common import excutils
|
|
from neutron.openstack.common import log as logging
|
|
from neutron.plugins.common import constants
|
|
from neutron.services.loadbalancer import agent_scheduler
|
|
from neutron.services import provider_configuration as pconf
|
|
from neutron.services import service_base
|
|
|
|
LOG = logging.getLogger(__name__)
|
|
|
|
|
|
class LoadBalancerPlugin(ldb.LoadBalancerPluginDb,
|
|
agent_scheduler.LbaasAgentSchedulerDbMixin):
|
|
"""Implementation of the Neutron Loadbalancer Service Plugin.
|
|
|
|
This class manages the workflow of LBaaS request/response.
|
|
Most DB related works are implemented in class
|
|
loadbalancer_db.LoadBalancerPluginDb.
|
|
"""
|
|
supported_extension_aliases = ["lbaas",
|
|
"lbaas_agent_scheduler",
|
|
"service-type"]
|
|
|
|
# lbaas agent notifiers to handle agent update operations;
|
|
# can be updated by plugin drivers while loading;
|
|
# will be extracted by neutron manager when loading service plugins;
|
|
agent_notifiers = {}
|
|
|
|
def __init__(self):
|
|
"""Initialization for the loadbalancer service plugin."""
|
|
|
|
qdbapi.register_models()
|
|
self.service_type_manager = st_db.ServiceTypeManager.get_instance()
|
|
self._load_drivers()
|
|
|
|
def _load_drivers(self):
|
|
"""Loads plugin-drivers specified in configuration."""
|
|
self.drivers, self.default_provider = service_base.load_drivers(
|
|
constants.LOADBALANCER, self)
|
|
|
|
# we're at the point when extensions are not loaded yet
|
|
# so prevent policy from being loaded
|
|
ctx = context.get_admin_context(load_admin_roles=False)
|
|
# stop service in case provider was removed, but resources were not
|
|
self._check_orphan_pool_associations(ctx, self.drivers.keys())
|
|
|
|
def _check_orphan_pool_associations(self, context, provider_names):
|
|
"""Checks remaining associations between pools and providers.
|
|
|
|
If admin has not undeployed resources with provider that was deleted
|
|
from configuration, neutron service is stopped. Admin must delete
|
|
resources prior to removing providers from configuration.
|
|
"""
|
|
pools = self.get_pools(context)
|
|
lost_providers = set([pool['provider'] for pool in pools
|
|
if pool['provider'] not in provider_names])
|
|
# resources are left without provider - stop the service
|
|
if lost_providers:
|
|
msg = _("Delete associated loadbalancer pools before "
|
|
"removing providers %s") % list(lost_providers)
|
|
LOG.exception(msg)
|
|
raise SystemExit(msg)
|
|
|
|
def _get_driver_for_provider(self, provider):
|
|
if provider in self.drivers:
|
|
return self.drivers[provider]
|
|
# raise if not associated (should never be reached)
|
|
raise n_exc.Invalid(_("Error retrieving driver for provider %s") %
|
|
provider)
|
|
|
|
def _get_driver_for_pool(self, context, pool_id):
|
|
pool = self.get_pool(context, pool_id)
|
|
try:
|
|
return self.drivers[pool['provider']]
|
|
except KeyError:
|
|
raise n_exc.Invalid(_("Error retrieving provider for pool %s") %
|
|
pool_id)
|
|
|
|
def get_plugin_type(self):
|
|
return constants.LOADBALANCER
|
|
|
|
def get_plugin_description(self):
|
|
return "Neutron LoadBalancer Service Plugin"
|
|
|
|
def create_vip(self, context, vip):
|
|
v = super(LoadBalancerPlugin, self).create_vip(context, vip)
|
|
driver = self._get_driver_for_pool(context, v['pool_id'])
|
|
driver.create_vip(context, v)
|
|
return v
|
|
|
|
def update_vip(self, context, id, vip):
|
|
if 'status' not in vip['vip']:
|
|
vip['vip']['status'] = constants.PENDING_UPDATE
|
|
old_vip = self.get_vip(context, id)
|
|
v = super(LoadBalancerPlugin, self).update_vip(context, id, vip)
|
|
driver = self._get_driver_for_pool(context, v['pool_id'])
|
|
driver.update_vip(context, old_vip, v)
|
|
return v
|
|
|
|
def _delete_db_vip(self, context, id):
|
|
# proxy the call until plugin inherits from DBPlugin
|
|
super(LoadBalancerPlugin, self).delete_vip(context, id)
|
|
|
|
def delete_vip(self, context, id):
|
|
self.update_status(context, ldb.Vip,
|
|
id, constants.PENDING_DELETE)
|
|
v = self.get_vip(context, id)
|
|
driver = self._get_driver_for_pool(context, v['pool_id'])
|
|
driver.delete_vip(context, v)
|
|
|
|
def _get_provider_name(self, context, pool):
|
|
if ('provider' in pool and
|
|
pool['provider'] != attrs.ATTR_NOT_SPECIFIED):
|
|
provider_name = pconf.normalize_provider_name(pool['provider'])
|
|
self.validate_provider(provider_name)
|
|
return provider_name
|
|
else:
|
|
if not self.default_provider:
|
|
raise pconf.DefaultServiceProviderNotFound(
|
|
service_type=constants.LOADBALANCER)
|
|
return self.default_provider
|
|
|
|
def create_pool(self, context, pool):
|
|
provider_name = self._get_provider_name(context, pool['pool'])
|
|
p = super(LoadBalancerPlugin, self).create_pool(context, pool)
|
|
|
|
self.service_type_manager.add_resource_association(
|
|
context,
|
|
constants.LOADBALANCER,
|
|
provider_name, p['id'])
|
|
#need to add provider name to pool dict,
|
|
#because provider was not known to db plugin at pool creation
|
|
p['provider'] = provider_name
|
|
driver = self.drivers[provider_name]
|
|
driver.create_pool(context, p)
|
|
return p
|
|
|
|
def update_pool(self, context, id, pool):
|
|
if 'status' not in pool['pool']:
|
|
pool['pool']['status'] = constants.PENDING_UPDATE
|
|
old_pool = self.get_pool(context, id)
|
|
p = super(LoadBalancerPlugin, self).update_pool(context, id, pool)
|
|
driver = self._get_driver_for_provider(p['provider'])
|
|
driver.update_pool(context, old_pool, p)
|
|
return p
|
|
|
|
def _delete_db_pool(self, context, id):
|
|
# proxy the call until plugin inherits from DBPlugin
|
|
# rely on uuid uniqueness:
|
|
try:
|
|
with context.session.begin(subtransactions=True):
|
|
self.service_type_manager.del_resource_associations(
|
|
context, [id])
|
|
super(LoadBalancerPlugin, self).delete_pool(context, id)
|
|
except Exception:
|
|
# that should not happen
|
|
# if it's still a case - something goes wrong
|
|
# log the error and mark the pool as ERROR
|
|
LOG.error(_('Failed to delete pool %s, putting it in ERROR state'),
|
|
id)
|
|
with excutils.save_and_reraise_exception():
|
|
self.update_status(context, ldb.Pool,
|
|
id, constants.ERROR)
|
|
|
|
def delete_pool(self, context, id):
|
|
# check for delete conditions and update the status
|
|
# within a transaction to avoid a race
|
|
with context.session.begin(subtransactions=True):
|
|
self.update_status(context, ldb.Pool,
|
|
id, constants.PENDING_DELETE)
|
|
self._ensure_pool_delete_conditions(context, id)
|
|
p = self.get_pool(context, id)
|
|
driver = self._get_driver_for_provider(p['provider'])
|
|
driver.delete_pool(context, p)
|
|
|
|
def create_member(self, context, member):
|
|
m = super(LoadBalancerPlugin, self).create_member(context, member)
|
|
driver = self._get_driver_for_pool(context, m['pool_id'])
|
|
driver.create_member(context, m)
|
|
return m
|
|
|
|
def update_member(self, context, id, member):
|
|
if 'status' not in member['member']:
|
|
member['member']['status'] = constants.PENDING_UPDATE
|
|
old_member = self.get_member(context, id)
|
|
m = super(LoadBalancerPlugin, self).update_member(context, id, member)
|
|
driver = self._get_driver_for_pool(context, m['pool_id'])
|
|
driver.update_member(context, old_member, m)
|
|
return m
|
|
|
|
def _delete_db_member(self, context, id):
|
|
# proxy the call until plugin inherits from DBPlugin
|
|
super(LoadBalancerPlugin, self).delete_member(context, id)
|
|
|
|
def delete_member(self, context, id):
|
|
self.update_status(context, ldb.Member,
|
|
id, constants.PENDING_DELETE)
|
|
m = self.get_member(context, id)
|
|
driver = self._get_driver_for_pool(context, m['pool_id'])
|
|
driver.delete_member(context, m)
|
|
|
|
def create_health_monitor(self, context, health_monitor):
|
|
hm = super(LoadBalancerPlugin, self).create_health_monitor(
|
|
context,
|
|
health_monitor
|
|
)
|
|
return hm
|
|
|
|
def update_health_monitor(self, context, id, health_monitor):
|
|
old_hm = self.get_health_monitor(context, id)
|
|
hm = super(LoadBalancerPlugin, self).update_health_monitor(
|
|
context,
|
|
id,
|
|
health_monitor
|
|
)
|
|
|
|
with context.session.begin(subtransactions=True):
|
|
qry = context.session.query(
|
|
ldb.PoolMonitorAssociation
|
|
).filter_by(monitor_id=hm['id']).join(ldb.Pool)
|
|
for assoc in qry:
|
|
driver = self._get_driver_for_pool(context, assoc['pool_id'])
|
|
driver.update_health_monitor(context, old_hm,
|
|
hm, assoc['pool_id'])
|
|
return hm
|
|
|
|
def _delete_db_pool_health_monitor(self, context, hm_id, pool_id):
|
|
super(LoadBalancerPlugin, self).delete_pool_health_monitor(context,
|
|
hm_id,
|
|
pool_id)
|
|
|
|
def _delete_db_health_monitor(self, context, id):
|
|
super(LoadBalancerPlugin, self).delete_health_monitor(context, id)
|
|
|
|
def delete_health_monitor(self, context, id):
|
|
with context.session.begin(subtransactions=True):
|
|
hm = self.get_health_monitor(context, id)
|
|
qry = context.session.query(
|
|
ldb.PoolMonitorAssociation
|
|
).filter_by(monitor_id=id).join(ldb.Pool)
|
|
for assoc in qry:
|
|
driver = self._get_driver_for_pool(context, assoc['pool_id'])
|
|
driver.delete_pool_health_monitor(context,
|
|
hm,
|
|
assoc['pool_id'])
|
|
super(LoadBalancerPlugin, self).delete_health_monitor(context, id)
|
|
|
|
def create_pool_health_monitor(self, context, health_monitor, pool_id):
|
|
retval = super(LoadBalancerPlugin, self).create_pool_health_monitor(
|
|
context,
|
|
health_monitor,
|
|
pool_id
|
|
)
|
|
monitor_id = health_monitor['health_monitor']['id']
|
|
hm = self.get_health_monitor(context, monitor_id)
|
|
driver = self._get_driver_for_pool(context, pool_id)
|
|
driver.create_pool_health_monitor(context, hm, pool_id)
|
|
return retval
|
|
|
|
def delete_pool_health_monitor(self, context, id, pool_id):
|
|
self.update_pool_health_monitor(context, id, pool_id,
|
|
constants.PENDING_DELETE)
|
|
hm = self.get_health_monitor(context, id)
|
|
driver = self._get_driver_for_pool(context, pool_id)
|
|
driver.delete_pool_health_monitor(context, hm, pool_id)
|
|
|
|
def stats(self, context, pool_id):
|
|
driver = self._get_driver_for_pool(context, pool_id)
|
|
stats_data = driver.stats(context, pool_id)
|
|
# if we get something from the driver -
|
|
# update the db and return the value from db
|
|
# else - return what we have in db
|
|
if stats_data:
|
|
super(LoadBalancerPlugin, self).update_pool_stats(
|
|
context,
|
|
pool_id,
|
|
stats_data
|
|
)
|
|
return super(LoadBalancerPlugin, self).stats(context,
|
|
pool_id)
|
|
|
|
def populate_vip_graph(self, context, vip):
|
|
"""Populate the vip with: pool, members, healthmonitors."""
|
|
|
|
pool = self.get_pool(context, vip['pool_id'])
|
|
vip['pool'] = pool
|
|
vip['members'] = [self.get_member(context, member_id)
|
|
for member_id in pool['members']]
|
|
vip['health_monitors'] = [self.get_health_monitor(context, hm_id)
|
|
for hm_id in pool['health_monitors']]
|
|
return vip
|
|
|
|
def validate_provider(self, provider):
|
|
if provider not in self.drivers:
|
|
raise pconf.ServiceProviderNotFound(
|
|
provider=provider, service_type=constants.LOADBALANCER)
|