262 lines
11 KiB
Python
262 lines
11 KiB
Python
# Copyright (c) 2013 OpenStack Foundation.
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# All Rights Reserved.
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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 oslo.config import cfg
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import sqlalchemy as sa
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from sqlalchemy import func
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from sqlalchemy import orm
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from sqlalchemy.orm import exc
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from sqlalchemy.orm import joinedload
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from neutron.common import constants
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from neutron.db import agents_db
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from neutron.db.agentschedulers_db import AgentSchedulerDbMixin
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from neutron.db import model_base
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from neutron.db import models_v2
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from neutron.extensions import l3agentscheduler
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L3_AGENTS_SCHEDULER_OPTS = [
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cfg.StrOpt('router_scheduler_driver',
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default='neutron.scheduler.l3_agent_scheduler.ChanceScheduler',
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help=_('Driver to use for scheduling '
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'router to a default L3 agent')),
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cfg.BoolOpt('router_auto_schedule', default=True,
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help=_('Allow auto scheduling of routers to L3 agent.')),
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]
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cfg.CONF.register_opts(L3_AGENTS_SCHEDULER_OPTS)
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class RouterL3AgentBinding(model_base.BASEV2, models_v2.HasId):
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"""Represents binding between neutron routers and L3 agents."""
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router_id = sa.Column(sa.String(36),
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sa.ForeignKey("routers.id", ondelete='CASCADE'))
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l3_agent = orm.relation(agents_db.Agent)
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l3_agent_id = sa.Column(sa.String(36),
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sa.ForeignKey("agents.id",
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ondelete='CASCADE'))
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class L3AgentSchedulerDbMixin(l3agentscheduler.L3AgentSchedulerPluginBase,
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AgentSchedulerDbMixin):
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"""Mixin class to add l3 agent scheduler extension to plugins
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using the l3 agent for routing.
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"""
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router_scheduler = None
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def add_router_to_l3_agent(self, context, agent_id, router_id):
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"""Add a l3 agent to host a router."""
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router = self.get_router(context, router_id)
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with context.session.begin(subtransactions=True):
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agent_db = self._get_agent(context, agent_id)
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if (agent_db['agent_type'] != constants.AGENT_TYPE_L3 or
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not agent_db['admin_state_up'] or
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not self.get_l3_agent_candidates(router, [agent_db])):
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raise l3agentscheduler.InvalidL3Agent(id=agent_id)
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query = context.session.query(RouterL3AgentBinding)
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try:
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binding = query.filter_by(router_id=router_id).one()
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raise l3agentscheduler.RouterHostedByL3Agent(
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router_id=router_id,
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agent_id=binding.l3_agent_id)
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except exc.NoResultFound:
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pass
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result = self.auto_schedule_routers(context,
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agent_db.host,
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[router_id])
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if not result:
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raise l3agentscheduler.RouterSchedulingFailed(
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router_id=router_id, agent_id=agent_id)
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l3_notifier = self.agent_notifiers.get(constants.AGENT_TYPE_L3)
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if l3_notifier:
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l3_notifier.router_added_to_agent(
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context, [router_id], agent_db.host)
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def remove_router_from_l3_agent(self, context, agent_id, router_id):
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"""Remove the router from l3 agent.
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After removal, the router will be non-hosted until there is update
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which leads to re-schedule or be added to another agent manually.
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"""
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agent = self._get_agent(context, agent_id)
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with context.session.begin(subtransactions=True):
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query = context.session.query(RouterL3AgentBinding)
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query = query.filter(
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RouterL3AgentBinding.router_id == router_id,
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RouterL3AgentBinding.l3_agent_id == agent_id)
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try:
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binding = query.one()
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except exc.NoResultFound:
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raise l3agentscheduler.RouterNotHostedByL3Agent(
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router_id=router_id, agent_id=agent_id)
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context.session.delete(binding)
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l3_notifier = self.agent_notifiers.get(constants.AGENT_TYPE_L3)
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if l3_notifier:
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l3_notifier.router_removed_from_agent(
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context, router_id, agent.host)
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def list_routers_on_l3_agent(self, context, agent_id):
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query = context.session.query(RouterL3AgentBinding.router_id)
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query = query.filter(RouterL3AgentBinding.l3_agent_id == agent_id)
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router_ids = [item[0] for item in query]
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if router_ids:
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return {'routers':
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self.get_routers(context, filters={'id': router_ids})}
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else:
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return {'routers': []}
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def list_active_sync_routers_on_active_l3_agent(
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self, context, host, router_ids):
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agent = self._get_agent_by_type_and_host(
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context, constants.AGENT_TYPE_L3, host)
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if not agent.admin_state_up:
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return []
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query = context.session.query(RouterL3AgentBinding.router_id)
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query = query.filter(
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RouterL3AgentBinding.l3_agent_id == agent.id)
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if not router_ids:
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pass
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else:
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query = query.filter(
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RouterL3AgentBinding.router_id.in_(router_ids))
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router_ids = [item[0] for item in query]
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if router_ids:
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return self.get_sync_data(context, router_ids=router_ids,
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active=True)
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else:
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return []
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def get_l3_agents_hosting_routers(self, context, router_ids,
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admin_state_up=None,
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active=None):
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if not router_ids:
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return []
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query = context.session.query(RouterL3AgentBinding)
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if len(router_ids) > 1:
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query = query.options(joinedload('l3_agent')).filter(
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RouterL3AgentBinding.router_id.in_(router_ids))
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else:
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query = query.options(joinedload('l3_agent')).filter(
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RouterL3AgentBinding.router_id == router_ids[0])
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if admin_state_up is not None:
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query = (query.filter(agents_db.Agent.admin_state_up ==
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admin_state_up))
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l3_agents = [binding.l3_agent for binding in query]
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if active is not None:
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l3_agents = [l3_agent for l3_agent in
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l3_agents if not
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agents_db.AgentDbMixin.is_agent_down(
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l3_agent['heartbeat_timestamp'])]
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return l3_agents
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def _get_l3_bindings_hosting_routers(self, context, router_ids):
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if not router_ids:
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return []
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query = context.session.query(RouterL3AgentBinding)
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if len(router_ids) > 1:
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query = query.options(joinedload('l3_agent')).filter(
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RouterL3AgentBinding.router_id.in_(router_ids))
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else:
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query = query.options(joinedload('l3_agent')).filter(
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RouterL3AgentBinding.router_id == router_ids[0])
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return query.all()
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def list_l3_agents_hosting_router(self, context, router_id):
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with context.session.begin(subtransactions=True):
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bindings = self._get_l3_bindings_hosting_routers(
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context, [router_id])
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results = []
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for binding in bindings:
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l3_agent_dict = self._make_agent_dict(binding.l3_agent)
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results.append(l3_agent_dict)
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if results:
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return {'agents': results}
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else:
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return {'agents': []}
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def get_l3_agents(self, context, active=None, filters=None):
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query = context.session.query(agents_db.Agent)
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query = query.filter(
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agents_db.Agent.agent_type == constants.AGENT_TYPE_L3)
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if active is not None:
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query = (query.filter(agents_db.Agent.admin_state_up == active))
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if filters:
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for key, value in filters.iteritems():
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column = getattr(agents_db.Agent, key, None)
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if column:
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query = query.filter(column.in_(value))
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return [l3_agent
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for l3_agent in query
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if AgentSchedulerDbMixin.is_eligible_agent(active, l3_agent)]
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def get_l3_agent_candidates(self, sync_router, l3_agents):
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"""Get the valid l3 agents for the router from a list of l3_agents."""
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candidates = []
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for l3_agent in l3_agents:
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if not l3_agent.admin_state_up:
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continue
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agent_conf = self.get_configuration_dict(l3_agent)
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router_id = agent_conf.get('router_id', None)
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use_namespaces = agent_conf.get('use_namespaces', True)
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handle_internal_only_routers = agent_conf.get(
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'handle_internal_only_routers', True)
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gateway_external_network_id = agent_conf.get(
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'gateway_external_network_id', None)
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if not use_namespaces and router_id != sync_router['id']:
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continue
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ex_net_id = (sync_router['external_gateway_info'] or {}).get(
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'network_id')
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if ((not ex_net_id and not handle_internal_only_routers) or
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(ex_net_id and gateway_external_network_id and
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ex_net_id != gateway_external_network_id)):
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continue
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candidates.append(l3_agent)
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return candidates
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def auto_schedule_routers(self, context, host, router_ids):
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if self.router_scheduler:
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return self.router_scheduler.auto_schedule_routers(
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self, context, host, router_ids)
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def schedule_router(self, context, router):
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if self.router_scheduler:
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return self.router_scheduler.schedule(
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self, context, router)
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def schedule_routers(self, context, routers):
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"""Schedule the routers to l3 agents."""
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for router in routers:
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self.schedule_router(context, router)
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def get_l3_agent_with_min_routers(self, context, agent_ids):
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"""Return l3 agent with the least number of routers."""
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query = context.session.query(
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agents_db.Agent,
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func.count(
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RouterL3AgentBinding.router_id
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).label('count')).outerjoin(RouterL3AgentBinding).group_by(
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RouterL3AgentBinding.l3_agent_id).order_by('count')
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res = query.filter(agents_db.Agent.id.in_(agent_ids)).first()
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return res[0]
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