79 lines
2.5 KiB
Python
79 lines
2.5 KiB
Python
# Copyright (c) 2014 Hewlett-Packard Development Company, L.P.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from oslo_log import log as logging
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import oslo_messaging
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from osprofiler import profiler
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from heat.common.i18n import _LE
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from heat.common.i18n import _LI
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from heat.common import messaging as rpc_messaging
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from heat.openstack.common import service
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from heat.rpc import worker_client as rpc_client
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LOG = logging.getLogger(__name__)
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@profiler.trace_cls("rpc")
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class WorkerService(service.Service):
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"""
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This service is dedicated to handle internal messages to the 'worker'
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(a.k.a. 'converger') actor in convergence. Messages on this bus will
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use the 'cast' rather than 'call' method to anycast the message to
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an engine that will handle it asynchronously. It won't wait for
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or expect replies from these messages.
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"""
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RPC_API_VERSION = '1.0'
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def __init__(self,
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host,
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topic,
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engine_id,
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thread_group_mgr):
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super(WorkerService, self).__init__()
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self.host = host
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self.topic = topic
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self.engine_id = engine_id
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self.thread_group_mgr = thread_group_mgr
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self._rpc_client = None
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self._rpc_server = None
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def start(self):
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target = oslo_messaging.Target(
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version=self.RPC_API_VERSION,
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server=self.host,
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topic=self.topic)
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LOG.info(_LI("Starting WorkerService ..."))
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self._rpc_server = rpc_messaging.get_rpc_server(target, self)
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self._rpc_server.start()
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self._rpc_client = rpc_client.WorkerClient()
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super(WorkerService, self).start()
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def stop(self):
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# Stop rpc connection at first for preventing new requests
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LOG.info(_LI("Stopping WorkerService ..."))
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try:
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self._rpc_server.stop()
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self._rpc_server.wait()
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except Exception as e:
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LOG.error(_LE("WorkerService is failed to stop, %s"), e)
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super(WorkerService, self).stop()
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