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# -*- encoding: utf-8 -*-
#
# Copyright © 2012 eNovance <licensing@enovance.com>
#
# 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 signal
from oslo_log import log
import oslo_messaging as messaging
from oslo_service import service
from oslo_utils import importutils
from ironic.common import context
from ironic.common.i18n import _LE, _LI
from ironic.common import rpc
from ironic.objects import base as objects_base
LOG = log.getLogger(__name__)
class RPCService(service.Service):
def __init__(self, host, manager_module, manager_class):
super(RPCService, self).__init__()
self.host = host
manager_module = importutils.try_import(manager_module)
manager_class = getattr(manager_module, manager_class)
self.manager = manager_class(host, manager_module.MANAGER_TOPIC)
self.topic = self.manager.topic
self.rpcserver = None
self.deregister = True
def start(self):
super(RPCService, self).start()
admin_context = context.get_admin_context()
target = messaging.Target(topic=self.topic, server=self.host)
endpoints = [self.manager]
serializer = objects_base.IronicObjectSerializer()
self.rpcserver = rpc.get_server(target, endpoints, serializer)
self.rpcserver.start()
self.handle_signal()
self.manager.init_host(admin_context)
LOG.info(_LI('Created RPC server for service %(service)s on host '
'%(host)s.'),
{'service': self.topic, 'host': self.host})
def stop(self):
try:
self.rpcserver.stop()
self.rpcserver.wait()
except Exception as e:
LOG.exception(_LE('Service error occurred when stopping the '
'RPC server. Error: %s'), e)
try:
self.manager.del_host(deregister=self.deregister)
except Exception as e:
LOG.exception(_LE('Service error occurred when cleaning up '
'the RPC manager. Error: %s'), e)
super(RPCService, self).stop(graceful=True)
LOG.info(_LI('Stopped RPC server for service %(service)s on host '
'%(host)s.'),
{'service': self.topic, 'host': self.host})
def _handle_signal(self, signo, frame):
LOG.info(_LI('Got signal SIGUSR1. Not deregistering on next shutdown '
'of service %(service)s on host %(host)s.'),
{'service': self.topic, 'host': self.host})
self.deregister = False
def handle_signal(self):
"""Add a signal handler for SIGUSR1.
The handler ensures that the manager is not deregistered when it is
shutdown.
"""
signal.signal(signal.SIGUSR1, self._handle_signal)
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