fcb5068e79
In order to be able to perform graceful shutdown of services, we need to wait for all the current service threads to finish before exiting from the service process. Oslo.service provides this facility through it's wait() method, so we need to call it in Cinder Service stop() method which gets called when graceful shutdown is requested by sending the process SIGINT or SIGTERM. Partial-Bug: 1464822 Change-Id: I972b80251cebe353f9d89ff4e05db8d029ef5e73
475 lines
17 KiB
Python
475 lines
17 KiB
Python
# Copyright 2010 United States Government as represented by the
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# Administrator of the National Aeronautics and Space Administration.
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# Copyright 2011 Justin Santa Barbara
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# All Rights Reserved.
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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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"""Generic Node base class for all workers that run on hosts."""
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import inspect
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import os
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import random
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from oslo_concurrency import processutils
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from oslo_config import cfg
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from oslo_db import exception as db_exc
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from oslo_log import log as logging
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import oslo_messaging as messaging
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from oslo_utils import importutils
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import osprofiler.notifier
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from osprofiler import profiler
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import osprofiler.web
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from cinder import context
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from cinder import db
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from cinder import exception
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from cinder.i18n import _, _LE, _LI, _LW
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from cinder.objects import base as objects_base
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from cinder.openstack.common import loopingcall
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from cinder.openstack.common import service
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from cinder import rpc
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from cinder import version
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from cinder import wsgi
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LOG = logging.getLogger(__name__)
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service_opts = [
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cfg.IntOpt('report_interval',
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default=10,
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help='Interval, in seconds, between nodes reporting state '
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'to datastore'),
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cfg.IntOpt('periodic_interval',
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default=60,
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help='Interval, in seconds, between running periodic tasks'),
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cfg.IntOpt('periodic_fuzzy_delay',
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default=60,
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help='Range, in seconds, to randomly delay when starting the'
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' periodic task scheduler to reduce stampeding.'
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' (Disable by setting to 0)'),
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cfg.StrOpt('osapi_volume_listen',
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default="0.0.0.0",
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help='IP address on which OpenStack Volume API listens'),
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cfg.IntOpt('osapi_volume_listen_port',
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default=8776,
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help='Port on which OpenStack Volume API listens'),
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cfg.IntOpt('osapi_volume_workers',
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help='Number of workers for OpenStack Volume API service. '
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'The default is equal to the number of CPUs available.'), ]
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profiler_opts = [
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cfg.BoolOpt("profiler_enabled", default=False,
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help=_('If False fully disable profiling feature.')),
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cfg.BoolOpt("trace_sqlalchemy", default=False,
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help=_("If False doesn't trace SQL requests."))
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]
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CONF = cfg.CONF
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CONF.register_opts(service_opts)
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CONF.register_opts(profiler_opts, group="profiler")
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def setup_profiler(binary, host):
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if CONF.profiler.profiler_enabled:
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_notifier = osprofiler.notifier.create(
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"Messaging", messaging, context.get_admin_context().to_dict(),
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rpc.TRANSPORT, "cinder", binary, host)
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osprofiler.notifier.set(_notifier)
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LOG.warning(
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_LW("OSProfiler is enabled.\nIt means that person who knows "
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"any of hmac_keys that are specified in "
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"/etc/cinder/api-paste.ini can trace his requests. \n"
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"In real life only operator can read this file so there "
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"is no security issue. Note that even if person can "
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"trigger profiler, only admin user can retrieve trace "
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"information.\n"
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"To disable OSprofiler set in cinder.conf:\n"
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"[profiler]\nenabled=false"))
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else:
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osprofiler.web.disable()
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class Service(service.Service):
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"""Service object for binaries running on hosts.
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A service takes a manager and enables rpc by listening to queues based
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on topic. It also periodically runs tasks on the manager and reports
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it state to the database services table.
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"""
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def __init__(self, host, binary, topic, manager, report_interval=None,
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periodic_interval=None, periodic_fuzzy_delay=None,
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service_name=None, *args, **kwargs):
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super(Service, self).__init__()
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if not rpc.initialized():
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rpc.init(CONF)
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self.host = host
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self.binary = binary
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self.topic = topic
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self.manager_class_name = manager
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manager_class = importutils.import_class(self.manager_class_name)
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manager_class = profiler.trace_cls("rpc")(manager_class)
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self.manager = manager_class(host=self.host,
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service_name=service_name,
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*args, **kwargs)
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self.report_interval = report_interval
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self.periodic_interval = periodic_interval
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self.periodic_fuzzy_delay = periodic_fuzzy_delay
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self.basic_config_check()
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self.saved_args, self.saved_kwargs = args, kwargs
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self.timers = []
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setup_profiler(binary, host)
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def start(self):
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version_string = version.version_string()
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LOG.info(_LI('Starting %(topic)s node (version %(version_string)s)'),
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{'topic': self.topic, 'version_string': version_string})
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self.model_disconnected = False
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self.manager.init_host()
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ctxt = context.get_admin_context()
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try:
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service_ref = db.service_get_by_args(ctxt,
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self.host,
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self.binary)
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self.service_id = service_ref['id']
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except exception.NotFound:
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self._create_service_ref(ctxt)
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LOG.debug("Creating RPC server for service %s", self.topic)
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target = messaging.Target(topic=self.topic, server=self.host)
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endpoints = [self.manager]
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endpoints.extend(self.manager.additional_endpoints)
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serializer = objects_base.CinderObjectSerializer()
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self.rpcserver = rpc.get_server(target, endpoints, serializer)
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self.rpcserver.start()
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self.manager.init_host_with_rpc()
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if self.report_interval:
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pulse = loopingcall.FixedIntervalLoopingCall(
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self.report_state)
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pulse.start(interval=self.report_interval,
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initial_delay=self.report_interval)
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self.timers.append(pulse)
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if self.periodic_interval:
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if self.periodic_fuzzy_delay:
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initial_delay = random.randint(0, self.periodic_fuzzy_delay)
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else:
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initial_delay = None
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periodic = loopingcall.FixedIntervalLoopingCall(
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self.periodic_tasks)
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periodic.start(interval=self.periodic_interval,
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initial_delay=initial_delay)
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self.timers.append(periodic)
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def basic_config_check(self):
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"""Perform basic config checks before starting service."""
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# Make sure report interval is less than service down time
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if self.report_interval:
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if CONF.service_down_time <= self.report_interval:
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new_down_time = int(self.report_interval * 2.5)
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LOG.warning(
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_LW("Report interval must be less than service down "
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"time. Current config service_down_time: "
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"%(service_down_time)s, report_interval for this: "
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"service is: %(report_interval)s. Setting global "
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"service_down_time to: %(new_down_time)s"),
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{'service_down_time': CONF.service_down_time,
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'report_interval': self.report_interval,
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'new_down_time': new_down_time})
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CONF.set_override('service_down_time', new_down_time)
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def _create_service_ref(self, context):
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zone = CONF.storage_availability_zone
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service_ref = db.service_create(context,
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{'host': self.host,
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'binary': self.binary,
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'topic': self.topic,
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'report_count': 0,
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'availability_zone': zone})
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self.service_id = service_ref['id']
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def __getattr__(self, key):
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manager = self.__dict__.get('manager', None)
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return getattr(manager, key)
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@classmethod
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def create(cls, host=None, binary=None, topic=None, manager=None,
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report_interval=None, periodic_interval=None,
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periodic_fuzzy_delay=None, service_name=None):
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"""Instantiates class and passes back application object.
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:param host: defaults to CONF.host
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:param binary: defaults to basename of executable
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:param topic: defaults to bin_name - 'cinder-' part
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:param manager: defaults to CONF.<topic>_manager
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:param report_interval: defaults to CONF.report_interval
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:param periodic_interval: defaults to CONF.periodic_interval
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:param periodic_fuzzy_delay: defaults to CONF.periodic_fuzzy_delay
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"""
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if not host:
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host = CONF.host
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if not binary:
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binary = os.path.basename(inspect.stack()[-1][1])
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if not topic:
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topic = binary
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if not manager:
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subtopic = topic.rpartition('cinder-')[2]
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manager = CONF.get('%s_manager' % subtopic, None)
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if report_interval is None:
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report_interval = CONF.report_interval
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if periodic_interval is None:
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periodic_interval = CONF.periodic_interval
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if periodic_fuzzy_delay is None:
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periodic_fuzzy_delay = CONF.periodic_fuzzy_delay
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service_obj = cls(host, binary, topic, manager,
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report_interval=report_interval,
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periodic_interval=periodic_interval,
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periodic_fuzzy_delay=periodic_fuzzy_delay,
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service_name=service_name)
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return service_obj
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def kill(self):
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"""Destroy the service object in the datastore."""
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self.stop()
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try:
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db.service_destroy(context.get_admin_context(), self.service_id)
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except exception.NotFound:
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LOG.warning(_LW('Service killed that has no database entry'))
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def stop(self):
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# Try to shut the connection down, but if we get any sort of
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# errors, go ahead and ignore them.. as we're shutting down anyway
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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:
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pass
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for x in self.timers:
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try:
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x.stop()
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except Exception:
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pass
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self.timers = []
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super(Service, self).stop()
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def wait(self):
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for x in self.timers:
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try:
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x.wait()
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except Exception:
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pass
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def periodic_tasks(self, raise_on_error=False):
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"""Tasks to be run at a periodic interval."""
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ctxt = context.get_admin_context()
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self.manager.periodic_tasks(ctxt, raise_on_error=raise_on_error)
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def report_state(self):
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"""Update the state of this service in the datastore."""
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if not self.manager.is_working():
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# NOTE(dulek): If manager reports a problem we're not sending
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# heartbeats - to indicate that service is actually down.
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LOG.error(_LE('Manager for service %s is reporting problems, skip '
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'sending heartbeat. Service will appear "down".'),
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self.binary)
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return
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ctxt = context.get_admin_context()
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zone = CONF.storage_availability_zone
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state_catalog = {}
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try:
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try:
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service_ref = db.service_get(ctxt, self.service_id)
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except exception.NotFound:
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LOG.debug('The service database object disappeared, '
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'recreating it.')
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self._create_service_ref(ctxt)
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service_ref = db.service_get(ctxt, self.service_id)
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state_catalog['report_count'] = service_ref['report_count'] + 1
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if zone != service_ref['availability_zone']:
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state_catalog['availability_zone'] = zone
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db.service_update(ctxt,
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self.service_id, state_catalog)
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# TODO(termie): make this pattern be more elegant.
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if getattr(self, 'model_disconnected', False):
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self.model_disconnected = False
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LOG.error(_LE('Recovered model server connection!'))
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except db_exc.DBConnectionError:
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if not getattr(self, 'model_disconnected', False):
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self.model_disconnected = True
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LOG.exception(_LE('model server went away'))
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class WSGIService(object):
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"""Provides ability to launch API from a 'paste' configuration."""
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def __init__(self, name, loader=None):
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"""Initialize, but do not start the WSGI server.
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:param name: The name of the WSGI server given to the loader.
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:param loader: Loads the WSGI application using the given name.
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:returns: None
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"""
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self.name = name
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self.manager = self._get_manager()
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self.loader = loader or wsgi.Loader()
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self.app = self.loader.load_app(name)
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self.host = getattr(CONF, '%s_listen' % name, "0.0.0.0")
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self.port = getattr(CONF, '%s_listen_port' % name, 0)
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self.workers = (getattr(CONF, '%s_workers' % name, None) or
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processutils.get_worker_count())
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if self.workers and self.workers < 1:
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worker_name = '%s_workers' % name
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msg = (_("%(worker_name)s value of %(workers)d is invalid, "
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"must be greater than 0.") %
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{'worker_name': worker_name,
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'workers': self.workers})
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raise exception.InvalidInput(msg)
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setup_profiler(name, self.host)
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self.server = wsgi.Server(name,
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self.app,
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host=self.host,
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port=self.port)
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def _get_manager(self):
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"""Initialize a Manager object appropriate for this service.
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Use the service name to look up a Manager subclass from the
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configuration and initialize an instance. If no class name
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is configured, just return None.
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:returns: a Manager instance, or None.
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"""
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fl = '%s_manager' % self.name
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if fl not in CONF:
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return None
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manager_class_name = CONF.get(fl, None)
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if not manager_class_name:
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return None
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manager_class = importutils.import_class(manager_class_name)
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return manager_class()
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def start(self):
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"""Start serving this service using loaded configuration.
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Also, retrieve updated port number in case '0' was passed in, which
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indicates a random port should be used.
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:returns: None
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"""
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if self.manager:
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self.manager.init_host()
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self.server.start()
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self.port = self.server.port
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def stop(self):
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"""Stop serving this API.
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:returns: None
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"""
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self.server.stop()
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def wait(self):
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"""Wait for the service to stop serving this API.
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:returns: None
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"""
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self.server.wait()
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def reset(self):
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"""Reset server greenpool size to default.
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:returns: None
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"""
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self.server.reset()
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def process_launcher():
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return service.ProcessLauncher()
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# NOTE(vish): the global launcher is to maintain the existing
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# functionality of calling service.serve +
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# service.wait
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_launcher = None
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def serve(server, workers=None):
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global _launcher
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if _launcher:
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raise RuntimeError(_('serve() can only be called once'))
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_launcher = service.launch(server, workers=workers)
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def wait():
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LOG.debug('Full set of CONF:')
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for flag in CONF:
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flag_get = CONF.get(flag, None)
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# hide flag contents from log if contains a password
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# should use secret flag when switch over to openstack-common
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if ("_password" in flag or "_key" in flag or
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(flag == "sql_connection" and
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("mysql:" in flag_get or "postgresql:" in flag_get))):
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LOG.debug('%s : FLAG SET ', flag)
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else:
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LOG.debug('%(flag)s : %(flag_get)s',
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{'flag': flag, 'flag_get': flag_get})
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try:
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_launcher.wait()
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except KeyboardInterrupt:
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_launcher.stop()
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rpc.cleanup()
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class Launcher(object):
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def __init__(self):
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self.launch_service = serve
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self.wait = wait
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def get_launcher():
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# Note(lpetrut): ProcessLauncher uses green pipes which fail on Windows
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# due to missing support of non-blocking I/O pipes. For this reason, the
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# service must be spawned differently on Windows, using the ServiceLauncher
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# class instead.
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if os.name == 'nt':
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return Launcher()
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else:
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return process_launcher()
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