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