176 lines
7.5 KiB
Python
176 lines
7.5 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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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 import sql
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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 import agentschedulers_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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LOG = logging.getLogger(__name__)
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class AutoScheduler(object):
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def auto_schedule_networks(self, plugin, context, host):
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"""Schedule non-hosted networks to the DHCP agent on the specified
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host.
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"""
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agents_per_network = cfg.CONF.dhcp_agents_per_network
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# a list of (agent, net_ids) tuples
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bindings_to_add = []
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with context.session.begin(subtransactions=True):
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fields = ['network_id', 'enable_dhcp']
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subnets = plugin.get_subnets(context, fields=fields)
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net_ids = set(s['network_id'] for s in subnets
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if s['enable_dhcp'])
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if not net_ids:
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LOG.debug('No non-hosted networks')
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return False
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query = context.session.query(agents_db.Agent)
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query = query.filter(agents_db.Agent.agent_type ==
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constants.AGENT_TYPE_DHCP,
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agents_db.Agent.host == host,
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agents_db.Agent.admin_state_up == sql.true())
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dhcp_agents = query.all()
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for dhcp_agent in dhcp_agents:
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if agents_db.AgentDbMixin.is_agent_down(
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dhcp_agent.heartbeat_timestamp):
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LOG.warn(_LW('DHCP agent %s is not active'), dhcp_agent.id)
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continue
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for net_id in net_ids:
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agents = plugin.get_dhcp_agents_hosting_networks(
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context, [net_id])
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if len(agents) >= agents_per_network:
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continue
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if any(dhcp_agent.id == agent.id for agent in agents):
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continue
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bindings_to_add.append((dhcp_agent, net_id))
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# do it outside transaction so particular scheduling results don't
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# make other to fail
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for agent, net_id in bindings_to_add:
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self.resource_filter.bind(context, [agent], net_id)
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return True
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class ChanceScheduler(base_scheduler.BaseChanceScheduler, AutoScheduler):
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def __init__(self):
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super(ChanceScheduler, self).__init__(DhcpFilter())
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class WeightScheduler(base_scheduler.BaseWeightScheduler, AutoScheduler):
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def __init__(self):
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super(WeightScheduler, self).__init__(DhcpFilter())
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class DhcpFilter(base_resource_filter.BaseResourceFilter):
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def bind(self, context, agents, network_id):
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"""Bind the network to the agents."""
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# customize the bind logic
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bound_agents = agents[:]
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for agent in agents:
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context.session.begin(subtransactions=True)
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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 = agentschedulers_db.NetworkDhcpAgentBinding()
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binding.dhcp_agent_id = agent_id
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binding.network_id = network_id
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try:
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context.session.add(binding)
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# try to actually write the changes and catch integrity
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# DBDuplicateEntry
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context.session.commit()
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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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context.session.rollback()
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bound_agents.remove(agent)
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LOG.info(_LI('Agent %s already present'), agent_id)
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LOG.debug('Network %(network_id)s is scheduled to be '
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'hosted by DHCP agent %(agent_id)s',
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{'network_id': network_id,
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'agent_id': agent_id})
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super(DhcpFilter, self).bind(context, bound_agents, network_id)
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def filter_agents(self, plugin, context, network):
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"""Return the agents that can host the network."""
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agents_dict = self._get_network_hostable_dhcp_agents(
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plugin, context, network)
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if not agents_dict['hostable_agents'] or agents_dict['n_agents'] <= 0:
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return {'n_agents': 0, 'hostable_agents': []}
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return agents_dict
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def _get_dhcp_agents_hosting_network(self, plugin, context, network):
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"""Return dhcp agents hosting the given network or None if a given
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network is already hosted by enough number of agents.
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"""
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agents_per_network = cfg.CONF.dhcp_agents_per_network
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#TODO(gongysh) don't schedule the networks with only
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# subnets whose enable_dhcp is false
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with context.session.begin(subtransactions=True):
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network_hosted_agents = plugin.get_dhcp_agents_hosting_networks(
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context, [network['id']])
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if len(network_hosted_agents) >= agents_per_network:
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LOG.debug('Network %s is already hosted by enough agents.',
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network['id'])
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return
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return network_hosted_agents
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def _get_active_agents(self, plugin, context):
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"""Return a list of active dhcp agents."""
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with context.session.begin(subtransactions=True):
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active_dhcp_agents = plugin.get_agents_db(
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context, filters={
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'agent_type': [constants.AGENT_TYPE_DHCP],
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'admin_state_up': [True]})
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if not active_dhcp_agents:
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LOG.warn(_LW('No more DHCP agents'))
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return []
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return active_dhcp_agents
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def _get_network_hostable_dhcp_agents(self, plugin, context, network):
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"""Return number of agents which will actually host the given network
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and a list of dhcp agents which can host the given network
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"""
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hosted_agents = self._get_dhcp_agents_hosting_network(plugin,
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context, network)
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if hosted_agents is None:
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return {'n_agents': 0, 'hostable_agents': []}
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n_agents = cfg.CONF.dhcp_agents_per_network - len(hosted_agents)
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active_dhcp_agents = self._get_active_agents(plugin, context)
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if not active_dhcp_agents:
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return {'n_agents': 0, 'hostable_agents': []}
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hostable_dhcp_agents = [
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agent for agent in set(active_dhcp_agents)
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if agent not in hosted_agents and plugin.is_eligible_agent(
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context, True, agent)
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]
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if not hostable_dhcp_agents:
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return {'n_agents': 0, 'hostable_agents': []}
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n_agents = min(len(hostable_dhcp_agents), n_agents)
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return {'n_agents': n_agents, 'hostable_agents':
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hostable_dhcp_agents}
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