175 lines
7.6 KiB
Python
175 lines
7.6 KiB
Python
# Copyright (c) 2013 OpenStack Foundation.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import random
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from neutron_lib.agent import topics
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from neutron_lib.api import extensions
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from neutron_lib import constants
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from neutron_lib.plugins import constants as plugin_constants
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from neutron_lib.plugins import directory
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from neutron_lib import rpc as n_rpc
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from oslo_log import log as logging
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import oslo_messaging
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from neutron.api.rpc.agentnotifiers import utils as ag_utils
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from neutron.common import utils
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LOG = logging.getLogger(__name__)
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# default messaging timeout is 60 sec, so 2 here is chosen to not block API
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# call for more than 2 minutes
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AGENT_NOTIFY_MAX_ATTEMPTS = 2
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class L3AgentNotifyAPI(object):
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"""API for plugin to notify L3 agent."""
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def __init__(self, topic=topics.L3_AGENT):
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target = oslo_messaging.Target(topic=topic, version='1.0')
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self.client = n_rpc.get_client(target)
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@utils.disable_notifications
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def _notification_host(self, context, method, host, use_call=False,
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**kwargs):
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"""Notify the agent that is hosting the router."""
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LOG.debug('Notify agent at %(host)s the message '
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'%(method)s', {'host': host,
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'method': method})
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cctxt = self.client.prepare(server=host)
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rpc_method = (ag_utils.retry(cctxt.call, AGENT_NOTIFY_MAX_ATTEMPTS)
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if use_call else cctxt.cast)
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rpc_method(context, method, **kwargs)
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@utils.disable_notifications
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def _agent_notification(self, context, method, router_ids, operation,
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shuffle_agents):
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"""Notify changed routers to hosting l3 agents."""
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adminContext = context if context.is_admin else context.elevated()
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plugin = directory.get_plugin(plugin_constants.L3)
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for router_id in router_ids:
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hosts = plugin.get_hosts_to_notify(adminContext, router_id)
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if shuffle_agents:
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random.shuffle(hosts)
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for host in hosts:
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LOG.debug('Notify agent at %(topic)s.%(host)s the message '
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'%(method)s',
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{'topic': topics.L3_AGENT,
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'host': host,
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'method': method})
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cctxt = self.client.prepare(topic=topics.L3_AGENT,
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server=host,
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version='1.1')
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cctxt.cast(context, method, routers=[router_id])
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@utils.disable_notifications
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def _agent_notification_arp(self, context, method, router_id,
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operation, data):
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"""Notify arp details to l3 agents hosting router."""
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if not router_id:
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return
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dvr_arptable = {'router_id': router_id, 'arp_table': data}
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LOG.debug('Fanout dvr_arptable update: %s', dvr_arptable)
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cctxt = self.client.prepare(fanout=True, version='1.2')
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cctxt.cast(context, method, payload=dvr_arptable)
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@utils.disable_notifications
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def _notification(self, context, method, router_ids, operation,
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shuffle_agents, schedule_routers=True):
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"""Notify all the agents that are hosting the routers."""
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plugin = directory.get_plugin(plugin_constants.L3)
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if not plugin:
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LOG.error('No plugin for L3 routing registered. Cannot notify '
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'agents with the message %s', method)
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return
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if extensions.is_extension_supported(
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plugin, constants.L3_AGENT_SCHEDULER_EXT_ALIAS):
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adminContext = (context.is_admin and
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context or context.elevated())
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if schedule_routers:
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plugin.schedule_routers(adminContext, router_ids)
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self._agent_notification(
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context, method, router_ids, operation, shuffle_agents)
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else:
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cctxt = self.client.prepare(fanout=True)
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cctxt.cast(context, method, routers=router_ids)
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@utils.disable_notifications
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def _notification_fanout(self, context, method, router_id=None, **kwargs):
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"""Fanout the information to all L3 agents.
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This function will fanout the router_id or ext_net_id
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to the L3 Agents.
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"""
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ext_net_id = kwargs.get('ext_net_id')
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if router_id:
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kwargs['router_id'] = router_id
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LOG.debug('Fanout notify agent at %(topic)s the message '
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'%(method)s on router %(router_id)s',
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{'topic': topics.L3_AGENT,
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'method': method,
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'router_id': router_id})
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if ext_net_id:
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LOG.debug('Fanout notify agent at %(topic)s the message '
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'%(method)s for external_network %(ext_net_id)s',
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{'topic': topics.L3_AGENT,
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'method': method,
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'ext_net_id': ext_net_id})
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cctxt = self.client.prepare(fanout=True)
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cctxt.cast(context, method, **kwargs)
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def agent_updated(self, context, admin_state_up, host):
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self._notification_host(context, 'agent_updated', host,
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payload={'admin_state_up': admin_state_up})
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def router_deleted(self, context, router_id):
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self._notification_fanout(context, 'router_deleted', router_id)
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def routers_updated(self, context, router_ids, operation=None, data=None,
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shuffle_agents=False, schedule_routers=True):
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if router_ids:
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self._notification(context, 'routers_updated', router_ids,
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operation, shuffle_agents, schedule_routers)
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def add_arp_entry(self, context, router_id, arp_table, operation=None):
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self._agent_notification_arp(context, 'add_arp_entry', router_id,
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operation, arp_table)
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def del_arp_entry(self, context, router_id, arp_table, operation=None):
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self._agent_notification_arp(context, 'del_arp_entry', router_id,
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operation, arp_table)
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def delete_fipnamespace_for_ext_net(self, context, ext_net_id):
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self._notification_fanout(
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context, 'fipnamespace_delete_on_ext_net',
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ext_net_id=ext_net_id)
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def router_removed_from_agent(self, context, router_id, host):
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self._notification_host(context, 'router_removed_from_agent', host,
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payload={'router_id': router_id})
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def router_added_to_agent(self, context, router_ids, host):
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# need to use call here as we want to be sure agent received
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# notification and router will not be "lost". However using call()
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# itself is not a guarantee, calling code should handle exceptions and
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# retry
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self._notification_host(context, 'router_added_to_agent', host,
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use_call=True, payload=router_ids)
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def routers_updated_on_host(self, context, router_ids, host):
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self._notification_host(context, 'routers_updated', host,
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routers=router_ids)
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