vmware-nsx/neutron/extensions/lbaas_agentscheduler.py
Oleg Bondarev da65fe6951 Add agent scheduling for LBaaS namespace agent
- adds simple chance scheduling on create pool operation
- adds PoolsLoadbalancerAgentBinding db table
- adds lbaas_agentscheduler extension to list pools hosted by a particular agent
  and to get an agent hosting a particular pool
- adds agent notifiers mapping to AgentSchedulerDbMixin to make it easier
  for services to add their agent notifiers to the core plugin

Implements blueprint lbaas-agent-scheduler
Change-Id: Id98649fd5c7873dcd5be1a2b117b8bed25f06cc2
2013-07-19 13:25:04 +04:00

139 lines
4.3 KiB
Python

# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright (c) 2013 OpenStack Foundation.
# All rights reserved.
#
# 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.
from abc import abstractmethod
from neutron.api import extensions
from neutron.api.v2 import base
from neutron.api.v2 import resource
from neutron.common import constants
from neutron.extensions import agent
from neutron import manager
from neutron.plugins.common import constants as plugin_const
from neutron import policy
from neutron import wsgi
LOADBALANCER_POOL = 'loadbalancer-pool'
LOADBALANCER_POOLS = LOADBALANCER_POOL + 's'
LOADBALANCER_AGENT = 'loadbalancer-agent'
class PoolSchedulerController(wsgi.Controller):
def index(self, request, **kwargs):
lbaas_plugin = manager.NeutronManager.get_service_plugins().get(
plugin_const.LOADBALANCER)
if not lbaas_plugin:
return {'pools': []}
policy.enforce(request.context,
"get_%s" % LOADBALANCER_POOLS,
{},
plugin=lbaas_plugin)
return lbaas_plugin.list_pools_on_lbaas_agent(
request.context, kwargs['agent_id'])
class LbaasAgentHostingPoolController(wsgi.Controller):
def index(self, request, **kwargs):
lbaas_plugin = manager.NeutronManager.get_service_plugins().get(
plugin_const.LOADBALANCER)
if not lbaas_plugin:
return
policy.enforce(request.context,
"get_%s" % LOADBALANCER_AGENT,
{},
plugin=lbaas_plugin)
return lbaas_plugin.get_lbaas_agent_hosting_pool(
request.context, kwargs['pool_id'])
class Lbaas_agentscheduler(extensions.ExtensionDescriptor):
"""Extension class supporting l3 agent scheduler.
"""
@classmethod
def get_name(cls):
return "Loadbalancer Agent Scheduler"
@classmethod
def get_alias(cls):
return constants.LBAAS_AGENT_SCHEDULER_EXT_ALIAS
@classmethod
def get_description(cls):
return "Schedule pools among lbaas agents"
@classmethod
def get_namespace(cls):
return "http://docs.openstack.org/ext/lbaas_agent_scheduler/api/v1.0"
@classmethod
def get_updated(cls):
return "2013-02-07T10:00:00-00:00"
@classmethod
def get_resources(cls):
"""Returns Ext Resources."""
exts = []
parent = dict(member_name="agent",
collection_name="agents")
controller = resource.Resource(PoolSchedulerController(),
base.FAULT_MAP)
exts.append(extensions.ResourceExtension(
LOADBALANCER_POOLS, controller, parent))
parent = dict(member_name="pool",
collection_name="pools")
controller = resource.Resource(LbaasAgentHostingPoolController(),
base.FAULT_MAP)
exts.append(extensions.ResourceExtension(
LOADBALANCER_AGENT, controller, parent,
path_prefix=plugin_const.
COMMON_PREFIXES[plugin_const.LOADBALANCER]))
return exts
def get_extended_resources(self, version):
return {}
class NoEligibleLbaasAgent(agent.AgentNotFound):
message = _("No eligible loadbalancer agent found "
"for pool %(pool_id)s.")
class NoActiveLbaasAgent(agent.AgentNotFound):
message = _("No active loadbalancer agent found "
"for pool %(pool_id)s.")
class LbaasAgentSchedulerPluginBase(object):
"""REST API to operate the lbaas agent scheduler.
All of method must be in an admin context.
"""
@abstractmethod
def list_pools_on_lbaas_agent(self, context, id):
pass
@abstractmethod
def get_lbaas_agent_hosting_pool(self, context, pool_id):
pass