OpenStack Networking (Neutron)
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neutron/neutron/agent/ovsdb/native/connection.py

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# Copyright (c) 2015 Red Hat, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import os
import threading
from debtcollector import moves
from oslo_config import cfg
from ovs.db import idl
from ovs.stream import Stream
from ovsdbapp.backend.ovs_idl import connection as _connection
from ovsdbapp.backend.ovs_idl import event as idl_event
from ovsdbapp.backend.ovs_idl import idlutils
from ovsdbapp import event as ovsdb_event
import tenacity
from neutron.agent.ovsdb.native import exceptions as ovsdb_exc
from neutron.agent.ovsdb.native import helpers
from neutron.conf.agent import ovsdb_api
TransactionQueue = moves.moved_class(_connection.TransactionQueue,
'TransactionQueue', __name__)
Connection = moves.moved_class(_connection.Connection, 'Connection', __name__)
ovsdb_api.register_ovsdb_api_opts()
def configure_ssl_conn():
"""Configures required settings for an SSL based OVSDB client connection
:return: None
"""
req_ssl_opts = {'ssl_key_file': cfg.CONF.OVS.ssl_key_file,
'ssl_cert_file': cfg.CONF.OVS.ssl_cert_file,
'ssl_ca_cert_file': cfg.CONF.OVS.ssl_ca_cert_file}
for ssl_opt, ssl_file in req_ssl_opts.items():
if not ssl_file:
raise ovsdb_exc.OvsdbSslRequiredOptError(ssl_opt=ssl_opt)
elif not os.path.exists(ssl_file):
raise ovsdb_exc.OvsdbSslConfigNotFound(ssl_file=ssl_file)
# TODO(ihrachys): move to ovsdbapp
Stream.ssl_set_private_key_file(req_ssl_opts['ssl_key_file'])
Stream.ssl_set_certificate_file(req_ssl_opts['ssl_cert_file'])
Stream.ssl_set_ca_cert_file(req_ssl_opts['ssl_ca_cert_file'])
class BridgeCreateEvent(idl_event.RowEvent):
def __init__(self, metadata_agent):
self.agent = metadata_agent
table = 'Bridge'
super(BridgeCreateEvent, self).__init__((self.ROW_CREATE, ),
table, None)
self.event_name = 'BridgeCreateEvent'
def run(self, event, row, old):
self.agent.add_bridge(str(row.name))
class OvsIdl(idl.Idl):
SCHEMA = 'Open_vSwitch'
def __init__(self):
self._ovsdb_connection = cfg.CONF.OVS.ovsdb_connection
if self._ovsdb_connection.startswith('ssl:'):
configure_ssl_conn()
helper = self._get_ovsdb_helper(self._ovsdb_connection)
helper.register_all()
super(OvsIdl, self).__init__(self._ovsdb_connection, helper)
self.notify_handler = ovsdb_event.RowEventHandler()
@tenacity.retry(wait=tenacity.wait_exponential(multiplier=0.01),
stop=tenacity.stop_after_delay(1),
reraise=True)
def _do_get_schema_helper(self, connection):
return idlutils.get_schema_helper(connection, self.SCHEMA)
def _get_ovsdb_helper(self, connection):
try:
return idlutils.get_schema_helper(connection, self.SCHEMA)
except Exception:
helpers.enable_connection_uri(connection)
return self._do_get_schema_helper(connection)
def notify(self, event, row, updates=None):
self.notify_handler.notify(event, row, updates)
class OvsIdlMonitor(OvsIdl):
def __init__(self):
super(OvsIdlMonitor, self).__init__()
self._lock = threading.Lock()
self._bridges_to_monitor = []
self._bridges_added_list = []
def start_bridge_monitor(self, bridge_names):
if not bridge_names:
return
self._bridges_to_monitor = bridge_names
event = BridgeCreateEvent(self)
self.notify_handler.watch_event(event)
def add_bridge(self, bridge_name):
with self._lock:
if bridge_name in self._bridges_to_monitor:
self._bridges_added_list.append(bridge_name)
@property
def bridges_added(self):
with self._lock:
bridges = self._bridges_added_list
self._bridges_added_list = []
return bridges