192 lines
7.7 KiB
Python
192 lines
7.7 KiB
Python
# Copyright 2016 Huawei Technologies India Pvt. Ltd.
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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_db import exception as db_exc
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from oslo_log import log as logging
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from sqlalchemy.orm import exc
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from sqlalchemy import sql
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from neutron.db import agents_db
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from neutron.db import bgp_db
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from neutron.db import bgp_dragentscheduler_db as bgp_dras_db
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from neutron._i18n import _LI, _LW
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from neutron.scheduler import base_resource_filter
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from neutron.scheduler import base_scheduler
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from neutron.services.bgp.common import constants as bgp_consts
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LOG = logging.getLogger(__name__)
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BGP_SPEAKER_PER_DRAGENT = 1
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class BgpDrAgentFilter(base_resource_filter.BaseResourceFilter):
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def bind(self, context, agents, bgp_speaker_id):
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"""Bind the BgpSpeaker to a BgpDrAgent."""
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bound_agents = agents[:]
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for agent in agents:
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# saving agent_id to use it after rollback to avoid
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# DetachedInstanceError
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agent_id = agent.id
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binding = bgp_dras_db.BgpSpeakerDrAgentBinding()
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binding.agent_id = agent_id
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binding.bgp_speaker_id = bgp_speaker_id
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try:
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with context.session.begin(subtransactions=True):
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context.session.add(binding)
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except db_exc.DBDuplicateEntry:
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# it's totally ok, someone just did our job!
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bound_agents.remove(agent)
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LOG.info(_LI('BgpDrAgent %s already present'), agent_id)
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LOG.debug('BgpSpeaker %(bgp_speaker_id)s is scheduled to be '
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'hosted by BgpDrAgent %(agent_id)s',
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{'bgp_speaker_id': bgp_speaker_id,
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'agent_id': agent_id})
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super(BgpDrAgentFilter, self).bind(context, bound_agents,
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bgp_speaker_id)
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def filter_agents(self, plugin, context, bgp_speaker):
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"""Return the agents that can host the BgpSpeaker."""
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agents_dict = self._get_bgp_speaker_hostable_dragents(
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plugin, context, bgp_speaker)
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if not agents_dict['hostable_agents'] or agents_dict['n_agents'] <= 0:
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return {'n_agents': 0,
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'hostable_agents': [],
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'hosted_agents': []}
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return agents_dict
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def _get_active_dragents(self, plugin, context):
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"""Return a list of active BgpDrAgents."""
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with context.session.begin(subtransactions=True):
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active_dragents = plugin.get_agents_db(
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context, filters={
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'agent_type': [bgp_consts.AGENT_TYPE_BGP_ROUTING],
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'admin_state_up': [True]})
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if not active_dragents:
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return []
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return active_dragents
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def _get_num_dragents_hosting_bgp_speaker(self, bgp_speaker_id,
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dragent_bindings):
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return sum(1 if dragent_binding.bgp_speaker_id == bgp_speaker_id else 0
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for dragent_binding in dragent_bindings)
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def _get_bgp_speaker_hostable_dragents(self, plugin, context, bgp_speaker):
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"""Return number of additional BgpDrAgents which will actually host
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the given BgpSpeaker and a list of BgpDrAgents which can host the
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given BgpSpeaker
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"""
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# only one BgpSpeaker can be hosted by a BgpDrAgent for now.
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dragents_per_bgp_speaker = BGP_SPEAKER_PER_DRAGENT
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dragent_bindings = plugin.get_dragent_bgp_speaker_bindings(context)
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agents_hosting = [dragent_binding.agent_id
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for dragent_binding in dragent_bindings]
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num_dragents_hosting_bgp_speaker = (
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self._get_num_dragents_hosting_bgp_speaker(bgp_speaker['id'],
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dragent_bindings))
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n_agents = dragents_per_bgp_speaker - num_dragents_hosting_bgp_speaker
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if n_agents <= 0:
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return {'n_agents': 0,
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'hostable_agents': [],
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'hosted_agents': []}
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active_dragents = self._get_active_dragents(plugin, context)
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hostable_dragents = [
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agent for agent in set(active_dragents)
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if agent.id not in agents_hosting and plugin.is_eligible_agent(
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active=True, agent=agent)
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]
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if not hostable_dragents:
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return {'n_agents': 0,
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'hostable_agents': [],
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'hosted_agents': []}
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n_agents = min(len(hostable_dragents), n_agents)
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return {'n_agents': n_agents,
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'hostable_agents': hostable_dragents,
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'hosted_agents': num_dragents_hosting_bgp_speaker}
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class BgpDrAgentSchedulerBase(BgpDrAgentFilter):
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def schedule_unscheduled_bgp_speakers(self, context, host):
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"""Schedule unscheduled BgpSpeaker to a BgpDrAgent.
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"""
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LOG.debug('Started auto-scheduling on host %s', host)
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with context.session.begin(subtransactions=True):
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query = context.session.query(agents_db.Agent)
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query = query.filter_by(
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agent_type=bgp_consts.AGENT_TYPE_BGP_ROUTING,
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host=host,
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admin_state_up=sql.true())
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try:
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bgp_dragent = query.one()
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except (exc.NoResultFound):
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LOG.debug('No enabled BgpDrAgent on host %s', host)
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return False
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if agents_db.AgentDbMixin.is_agent_down(
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bgp_dragent.heartbeat_timestamp):
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LOG.warn(_LW('BgpDrAgent %s is down'), bgp_dragent.id)
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return False
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if self._is_bgp_speaker_hosted(context, bgp_dragent['id']):
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# One BgpDrAgent can only host one BGP speaker
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LOG.debug('BgpDrAgent already hosting a speaker on host %s. '
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'Cannot schedule an another one', host)
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return False
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unscheduled_speakers = self._get_unscheduled_bgp_speakers(context)
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if not unscheduled_speakers:
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LOG.debug('Nothing to auto-schedule on host %s', host)
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return False
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self.bind(context, [bgp_dragent], unscheduled_speakers[0])
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return True
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def _is_bgp_speaker_hosted(self, context, agent_id):
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speaker_binding_model = bgp_dras_db.BgpSpeakerDrAgentBinding
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query = context.session.query(speaker_binding_model)
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query = query.filter(speaker_binding_model.agent_id == agent_id)
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return query.count() > 0
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def _get_unscheduled_bgp_speakers(self, context):
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"""BGP speakers that needs to be scheduled.
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"""
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no_agent_binding = ~sql.exists().where(
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bgp_db.BgpSpeaker.id ==
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bgp_dras_db.BgpSpeakerDrAgentBinding.bgp_speaker_id)
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query = context.session.query(bgp_db.BgpSpeaker.id).filter(
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no_agent_binding)
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return [bgp_speaker_id_[0] for bgp_speaker_id_ in query]
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class ChanceScheduler(base_scheduler.BaseChanceScheduler,
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BgpDrAgentSchedulerBase):
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def __init__(self):
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super(ChanceScheduler, self).__init__(self)
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class WeightScheduler(base_scheduler.BaseWeightScheduler,
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BgpDrAgentSchedulerBase):
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def __init__(self):
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super(WeightScheduler, self).__init__(self)
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