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# Copyright 2016 Mellanox Technologies, Ltd
# All Rights Reserved.
#
# 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.
from neutron_lib.db import api as neutron_db_api
from oslo_config import cfg
from oslo_log import log as logging
from oslo_service import loopingcall
from networking_mlnx._i18n import _LE, _LI
from networking_mlnx.db import db
LOG = logging.getLogger(__name__)
class MaintenanceThread(object):
def __init__(self):
self.timer = loopingcall.FixedIntervalLoopingCall(self.execute_ops)
self.maintenance_interval = cfg.CONF.sdn.maintenance_interval
self.maintenance_ops = []
def start(self):
self.timer.start(self.maintenance_interval, stop_on_exception=False)
def _execute_op(self, operation, session):
op_details = operation.__name__
if operation.__doc__:
op_details += " (%s)" % operation.func_doc
try:
LOG.info(_LI("Starting maintenance operation %s."), op_details)
db.update_maintenance_operation(session, operation=operation)
operation(session=session)
LOG.info(_LI("Finished maintenance operation %s."), op_details)
except Exception:
LOG.exception(_LE("Failed during maintenance operation %s."),
op_details)
def execute_ops(self):
LOG.info(_LI("Starting journal maintenance run."))
session = neutron_db_api.get_reader_session()
if not db.lock_maintenance(session):
LOG.info(_LI("Maintenance already running, aborting."))
return
try:
for operation in self.maintenance_ops:
self._execute_op(operation, session)
finally:
db.update_maintenance_operation(session, operation=None)
db.unlock_maintenance(session)
LOG.info(_LI("Finished journal maintenance run."))
def register_operation(self, f):
"""Register a function to be run by the maintenance thread.
:param f: Function to call when the thread runs. The function will
receive a DB session to use for DB operations.
"""
self.maintenance_ops.append(f)
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