75 lines
2.4 KiB
Python
75 lines
2.4 KiB
Python
# Copyright 2013 Red Hat, Inc.
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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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import contextlib
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import eventlet
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from oslo_config import cfg
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from oslo_log import log as logging
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from neutron.agent.common import base_polling
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from neutron.agent.linux import async_process
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from neutron.agent.linux import ovsdb_monitor
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from neutron.plugins.ml2.drivers.openvswitch.agent.common import constants
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LOG = logging.getLogger(__name__)
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@contextlib.contextmanager
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def get_polling_manager(minimize_polling=False,
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ovsdb_monitor_respawn_interval=(
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constants.DEFAULT_OVSDBMON_RESPAWN)):
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if minimize_polling:
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pm = InterfacePollingMinimizer(
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ovsdb_monitor_respawn_interval=ovsdb_monitor_respawn_interval)
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pm.start()
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else:
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pm = base_polling.AlwaysPoll()
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try:
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yield pm
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finally:
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if minimize_polling:
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pm.stop()
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class InterfacePollingMinimizer(base_polling.BasePollingManager):
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"""Monitors ovsdb to determine when polling is required."""
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def __init__(
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self,
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ovsdb_monitor_respawn_interval=constants.DEFAULT_OVSDBMON_RESPAWN):
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super(InterfacePollingMinimizer, self).__init__()
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self._monitor = ovsdb_monitor.SimpleInterfaceMonitor(
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respawn_interval=ovsdb_monitor_respawn_interval,
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ovsdb_connection=cfg.CONF.OVS.ovsdb_connection)
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def start(self):
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self._monitor.start(block=True)
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def stop(self):
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try:
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self._monitor.stop()
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except async_process.AsyncProcessException:
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LOG.debug("InterfacePollingMinimizer was not running when stopped")
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def _is_polling_required(self):
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# Maximize the chances of update detection having a chance to
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# collect output.
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eventlet.sleep()
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return self._monitor.has_updates
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def get_events(self):
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return self._monitor.get_events()
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