407 lines
14 KiB
Python
407 lines
14 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_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 loopingcall
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from oslo_service import service
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from oslo_service import wsgi
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from oslo_utils import importutils
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from manila import context
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from manila import coordination
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from manila import db
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from manila import exception
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from manila import rpc
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from manila import version
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LOG = log.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='Seconds between nodes reporting state to datastore.'),
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cfg.IntOpt('periodic_interval',
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default=60,
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help='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 of 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.HostAddressOpt('osapi_share_listen',
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default="::",
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help='IP address for OpenStack Share API to listen '
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'on.'),
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cfg.PortOpt('osapi_share_listen_port',
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default=8786,
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help='Port for OpenStack Share API to listen on.'),
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cfg.IntOpt('osapi_share_workers',
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default=1,
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help='Number of workers for OpenStack Share API service.'),
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cfg.BoolOpt('osapi_share_use_ssl',
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default=False,
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help='Wraps the socket in a SSL context if True is set. '
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'A certificate file and key file must be specified.'),
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]
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CONF = cfg.CONF
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CONF.register_opts(service_opts)
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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, coordination=False, *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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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.availability_zone = self.manager.availability_zone
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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.saved_args, self.saved_kwargs = args, kwargs
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self.timers = []
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self.coordinator = coordination
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def start(self):
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version_string = version.version_string()
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LOG.info('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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ctxt = context.get_admin_context()
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if self.coordinator:
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coordination.LOCK_COORDINATOR.start()
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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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self.rpcserver = rpc.get_server(target, endpoints)
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self.rpcserver.start()
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self.manager.init_host()
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if self.report_interval:
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pulse = loopingcall.FixedIntervalLoopingCall(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 _create_service_ref(self, context):
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service_args = {
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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': self.availability_zone
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}
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service_ref = db.service_create(context, service_args)
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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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coordination=False):
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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 - 'manila-' 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('manila-')[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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coordination=coordination)
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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('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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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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if self.coordinator:
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try:
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coordination.LOCK_COORDINATOR.stop()
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except Exception:
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LOG.exception("Unable to stop the Tooz Locking "
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"Coordinator.")
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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_service_ready():
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# NOTE(haixin): If the service is still initializing or failed to
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# intialize.
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LOG.error('Manager for service %s is not ready yet, skipping state'
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' update routine. 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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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 (self.availability_zone !=
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service_ref['availability_zone']['name']):
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state_catalog['availability_zone'] = self.availability_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('Recovered model server connection!')
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# TODO(vish): this should probably only catch connection errors
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except Exception: # pylint: disable=W0702
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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('model server went away')
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class WSGIService(service.ServiceBase):
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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(CONF)
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if not rpc.initialized():
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rpc.init(CONF)
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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)
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self.use_ssl = getattr(CONF, '%s_use_ssl' % name, False)
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if self.workers is not None and self.workers < 1:
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LOG.warning(
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"Value of config option %(name)s_workers must be integer "
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"greater than 1. Input value ignored.", {'name': name})
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# Reset workers to default
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self.workers = None
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self.server = wsgi.Server(
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CONF,
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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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use_ssl=self.use_ssl
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)
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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(CONF, restart_method='mutate')
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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(CONF, server, workers=workers,
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restart_method='mutate')
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def wait():
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CONF.log_opt_values(LOG, log.DEBUG)
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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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