678 lines
26 KiB
Python
678 lines
26 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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import subprocess
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import sys
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import time
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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_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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osprofiler_initializer = importutils.try_import('osprofiler.initializer')
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profiler = importutils.try_import('osprofiler.profiler')
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profiler_opts = importutils.try_import('osprofiler.opts')
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from cinder.common import constants
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from cinder import context
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from cinder import coordination
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from cinder import exception
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from cinder.i18n import _
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from cinder import objects
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from cinder.objects import base as objects_base
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from cinder.objects import fields
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from cinder import rpc
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from cinder import version
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from cinder.volume import utils as vol_utils
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if os.name == 'nt':
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from os_win import utilsfactory as os_win_utilsfactory
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else:
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os_win_utilsfactory = None
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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.PortOpt('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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cfg.BoolOpt('osapi_volume_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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CONF = cfg.CONF
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CONF.register_opts(service_opts)
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if profiler_opts:
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profiler_opts.set_defaults(CONF)
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def setup_profiler(binary, host):
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if (osprofiler_initializer is None or
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profiler is None or
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profiler_opts is None):
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LOG.debug('osprofiler is not present')
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return
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if CONF.profiler.enabled:
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osprofiler_initializer.init_from_conf(
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conf=CONF,
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context=context.get_admin_context().to_dict(),
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project="cinder",
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service=binary,
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host=host
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)
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LOG.warning(
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"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/cinder.conf 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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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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# Make service_id a class attribute so it can be used for clean up
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service_id = None
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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, cluster=None, *args,
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**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.cluster = cluster
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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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self.coordination = coordination
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manager_class = importutils.import_class(self.manager_class_name)
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if CONF.profiler.enabled:
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manager_class = profiler.trace_cls("rpc")(manager_class)
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self.service = None
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self.manager = manager_class(host=self.host,
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cluster=self.cluster,
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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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# NOTE(geguileo): We need to create the Service DB entry before we
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# create the manager, otherwise capped versions for serializer and rpc
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# client would use existing DB entries not including us, which could
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# result in us using None (if it's the first time the service is run)
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# or an old version (if this is a normal upgrade of a single service).
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ctxt = context.get_admin_context()
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try:
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service_ref = objects.Service.get_by_args(ctxt, host, binary)
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service_ref.rpc_current_version = manager_class.RPC_API_VERSION
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obj_version = objects_base.OBJ_VERSIONS.get_current()
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service_ref.object_current_version = obj_version
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# added_to_cluster attribute marks when we consider that we have
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# just added a host to a cluster so we can include resources into
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# that cluster. We consider that we have added the host when we
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# didn't have data in the cluster DB field and our current
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# configuration has a cluster value. We don't want to do anything
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# automatic if the cluster is changed, in those cases we'll want
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# to use cinder manage command and to it manually.
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self.added_to_cluster = (not service_ref.cluster_name and cluster)
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if service_ref.cluster_name != cluster:
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LOG.info('This service has been moved from cluster '
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'%(cluster_svc)s to %(cluster_cfg)s. Resources '
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'will %(opt_no)sbe moved to the new cluster',
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{'cluster_svc': service_ref.cluster_name,
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'cluster_cfg': cluster,
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'opt_no': '' if self.added_to_cluster else 'NO '})
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if self.added_to_cluster:
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# We pass copy service's disable status in the cluster if we
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# have to create it.
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self._ensure_cluster_exists(ctxt, service_ref)
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service_ref.cluster_name = cluster
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service_ref.save()
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Service.service_id = service_ref.id
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self.origin_service_id = service_ref.id
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except exception.NotFound:
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self._create_service_ref(ctxt, manager_class.RPC_API_VERSION)
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# Service entry Entry didn't exist because it was manually removed
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# or it's the first time running, to be on the safe side we say we
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# were added if we are clustered.
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self.added_to_cluster = bool(cluster)
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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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setup_profiler(binary, host)
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self.rpcserver = None
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self.backend_rpcserver = None
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self.cluster_rpcserver = None
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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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if self.coordination:
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coordination.COORDINATOR.start()
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# NOTE(yikun): When re-spawning child process, we should set the class
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# attribute back using the origin service_id, otherwise,
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# the Service.service_id will be inherited from the parent process,
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# and will be recorded as the last started service id by mistaken.
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Service.service_id = self.origin_service_id
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self.manager.init_host(added_to_cluster=self.added_to_cluster,
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service_id=Service.service_id)
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LOG.debug("Creating RPC server for service %s", self.topic)
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ctxt = context.get_admin_context()
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endpoints = [self.manager]
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endpoints.extend(self.manager.additional_endpoints)
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obj_version_cap = objects.Service.get_minimum_obj_version(ctxt)
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LOG.debug("Pinning object versions for RPC server serializer to %s",
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obj_version_cap)
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serializer = objects_base.CinderObjectSerializer(obj_version_cap)
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target = messaging.Target(topic=self.topic, server=self.host)
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self.rpcserver = rpc.get_server(target, endpoints, serializer)
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self.rpcserver.start()
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# NOTE(dulek): Kids, don't do that at home. We're relying here on
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# oslo.messaging implementation details to keep backward compatibility
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# with pre-Ocata services. This will not matter once we drop
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# compatibility with them.
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if self.topic == constants.VOLUME_TOPIC:
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target = messaging.Target(
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topic='%(topic)s.%(host)s' % {'topic': self.topic,
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'host': self.host},
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server=vol_utils.extract_host(self.host, 'host'))
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self.backend_rpcserver = rpc.get_server(target, endpoints,
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serializer)
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self.backend_rpcserver.start()
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if self.cluster:
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LOG.info('Starting %(topic)s cluster %(cluster)s (version '
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'%(version)s)',
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{'topic': self.topic, 'version': version_string,
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'cluster': self.cluster})
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target = messaging.Target(
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topic='%s.%s' % (self.topic, self.cluster),
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server=vol_utils.extract_host(self.cluster, 'host'))
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serializer = objects_base.CinderObjectSerializer(obj_version_cap)
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self.cluster_rpcserver = rpc.get_server(target, endpoints,
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serializer)
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self.cluster_rpcserver.start()
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self.manager.init_host_with_rpc()
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if self.report_interval:
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self.tg.add_timer(self.report_interval, self.report_state,
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initial_delay=self.report_interval)
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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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self.tg.add_timer(self.periodic_interval, self.periodic_tasks,
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initial_delay=initial_delay)
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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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"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 _ensure_cluster_exists(self, context, service):
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if self.cluster:
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try:
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cluster = objects.Cluster.get_by_id(context, None,
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name=self.cluster,
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binary=self.binary)
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# If the cluster already exists, then the service replication
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# fields must match those of the cluster unless the service
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# is in error status.
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error_states = (fields.ReplicationStatus.ERROR,
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fields.ReplicationStatus.FAILOVER_ERROR)
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if service.replication_status not in error_states:
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for attr in ('replication_status', 'active_backend_id',
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'frozen'):
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if getattr(service, attr) != getattr(cluster, attr):
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setattr(service, attr, getattr(cluster, attr))
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except exception.ClusterNotFound:
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# Since the cluster didn't exist, we copy replication fields
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# from the service.
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cluster = objects.Cluster(
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context=context,
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name=self.cluster,
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binary=self.binary,
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disabled=service.disabled,
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replication_status=service.replication_status,
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active_backend_id=service.active_backend_id,
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frozen=service.frozen)
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try:
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cluster.create()
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# Race condition occurred and another service created the
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# cluster, so we can continue as it already exists.
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except exception.ClusterExists:
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pass
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def _create_service_ref(self, context, rpc_version=None):
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kwargs = {
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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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'rpc_current_version': rpc_version or self.manager.RPC_API_VERSION,
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'object_current_version': objects_base.OBJ_VERSIONS.get_current(),
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}
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kwargs['cluster_name'] = self.cluster
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service_ref = objects.Service(context=context, **kwargs)
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service_ref.create()
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Service.service_id = service_ref.id
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self.origin_service_id = service_ref.id
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self._ensure_cluster_exists(context, service_ref)
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# If we have updated the service_ref with replication data from
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# the cluster it will be saved.
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service_ref.save()
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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, cluster=None, **kwargs):
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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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:param cluster: Defaults to None, as only some services will have it
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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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coordination=coordination,
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cluster=cluster, **kwargs)
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return service_obj
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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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if self.backend_rpcserver:
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self.backend_rpcserver.stop()
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if self.cluster_rpcserver:
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self.cluster_rpcserver.stop()
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except Exception:
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pass
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if self.coordination:
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try:
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coordination.COORDINATOR.stop()
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except Exception:
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pass
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super(Service, self).stop(graceful=True)
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def wait(self):
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if self.rpcserver:
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self.rpcserver.wait()
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if self.backend_rpcserver:
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self.backend_rpcserver.wait()
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if self.cluster_rpcserver:
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self.cluster_rpcserver.wait()
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super(Service, self).wait()
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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.run_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('Manager for service %(binary)s %(host)s is '
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'reporting problems, not sending heartbeat. '
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'Service will appear "down".',
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{'binary': self.binary,
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'host': self.host})
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return
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ctxt = context.get_admin_context()
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try:
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try:
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service_ref = objects.Service.get_by_id(ctxt,
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Service.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 = objects.Service.get_by_id(ctxt,
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Service.service_id)
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service_ref.report_count += 1
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if self.availability_zone != service_ref.availability_zone:
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service_ref.availability_zone = self.availability_zone
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service_ref.save()
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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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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('model server went away')
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# NOTE(jsbryant) Other DB errors can happen in HA configurations.
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# such errors shouldn't kill this thread, so we handle them here.
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except db_exc.DBError:
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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('DBError encountered: ')
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except Exception:
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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('Exception encountered: ')
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|
|
def reset(self):
|
|
self.manager.reset()
|
|
super(Service, self).reset()
|
|
|
|
|
|
class WSGIService(service.ServiceBase):
|
|
"""Provides ability to launch API from a 'paste' configuration."""
|
|
|
|
def __init__(self, name, loader=None):
|
|
"""Initialize, but do not start the WSGI server.
|
|
|
|
:param name: The name of the WSGI server given to the loader.
|
|
:param loader: Loads the WSGI application using the given name.
|
|
:returns: None
|
|
|
|
"""
|
|
self.name = name
|
|
self.manager = self._get_manager()
|
|
self.loader = loader or wsgi.Loader(CONF)
|
|
self.app = self.loader.load_app(name)
|
|
self.host = getattr(CONF, '%s_listen' % name, "0.0.0.0")
|
|
self.port = getattr(CONF, '%s_listen_port' % name, 0)
|
|
self.use_ssl = getattr(CONF, '%s_use_ssl' % name, False)
|
|
self.workers = (getattr(CONF, '%s_workers' % name, None) or
|
|
processutils.get_worker_count())
|
|
if self.workers and self.workers < 1:
|
|
worker_name = '%s_workers' % name
|
|
msg = (_("%(worker_name)s value of %(workers)d is invalid, "
|
|
"must be greater than 0.") %
|
|
{'worker_name': worker_name,
|
|
'workers': self.workers})
|
|
raise exception.InvalidConfigurationValue(msg)
|
|
setup_profiler(name, self.host)
|
|
|
|
self.server = wsgi.Server(CONF,
|
|
name,
|
|
self.app,
|
|
host=self.host,
|
|
port=self.port,
|
|
use_ssl=self.use_ssl)
|
|
|
|
def _get_manager(self):
|
|
"""Initialize a Manager object appropriate for this service.
|
|
|
|
Use the service name to look up a Manager subclass from the
|
|
configuration and initialize an instance. If no class name
|
|
is configured, just return None.
|
|
|
|
:returns: a Manager instance, or None.
|
|
|
|
"""
|
|
fl = '%s_manager' % self.name
|
|
if fl not in CONF:
|
|
return None
|
|
|
|
manager_class_name = CONF.get(fl, None)
|
|
if not manager_class_name:
|
|
return None
|
|
|
|
manager_class = importutils.import_class(manager_class_name)
|
|
return manager_class()
|
|
|
|
def start(self):
|
|
"""Start serving this service using loaded configuration.
|
|
|
|
Also, retrieve updated port number in case '0' was passed in, which
|
|
indicates a random port should be used.
|
|
|
|
:returns: None
|
|
|
|
"""
|
|
if self.manager:
|
|
self.manager.init_host()
|
|
self.server.start()
|
|
self.port = self.server.port
|
|
|
|
def stop(self):
|
|
"""Stop serving this API.
|
|
|
|
:returns: None
|
|
|
|
"""
|
|
self.server.stop()
|
|
|
|
def wait(self):
|
|
"""Wait for the service to stop serving this API.
|
|
|
|
:returns: None
|
|
|
|
"""
|
|
self.server.wait()
|
|
|
|
def reset(self):
|
|
"""Reset server greenpool size to default.
|
|
|
|
:returns: None
|
|
|
|
"""
|
|
self.server.reset()
|
|
|
|
|
|
def process_launcher():
|
|
return service.ProcessLauncher(CONF, restart_method='mutate')
|
|
|
|
|
|
# NOTE(vish): the global launcher is to maintain the existing
|
|
# functionality of calling service.serve +
|
|
# service.wait
|
|
_launcher = None
|
|
|
|
|
|
def serve(server, workers=None):
|
|
global _launcher
|
|
if _launcher:
|
|
raise RuntimeError(_('serve() can only be called once'))
|
|
|
|
_launcher = service.launch(CONF, server, workers=workers)
|
|
|
|
|
|
def wait():
|
|
CONF.log_opt_values(LOG, logging.DEBUG)
|
|
|
|
try:
|
|
_launcher.wait()
|
|
except KeyboardInterrupt:
|
|
_launcher.stop()
|
|
rpc.cleanup()
|
|
|
|
|
|
class Launcher(object):
|
|
def __init__(self):
|
|
self.launch_service = serve
|
|
self.wait = wait
|
|
|
|
|
|
def get_launcher():
|
|
# Note(lpetrut): ProcessLauncher uses green pipes which fail on Windows
|
|
# due to missing support of non-blocking I/O pipes. For this reason, the
|
|
# service must be spawned differently on Windows, using the ServiceLauncher
|
|
# class instead.
|
|
if os.name == 'nt':
|
|
return Launcher()
|
|
else:
|
|
return process_launcher()
|
|
|
|
|
|
class WindowsProcessLauncher(object):
|
|
def __init__(self):
|
|
self._processutils = os_win_utilsfactory.get_processutils()
|
|
|
|
self._workers = []
|
|
self._worker_job_handles = []
|
|
self._signal_handler = service.SignalHandler()
|
|
self._add_signal_handlers()
|
|
|
|
def add_process(self, cmd):
|
|
LOG.info("Starting subprocess: %s", cmd)
|
|
|
|
worker = subprocess.Popen(cmd)
|
|
try:
|
|
job_handle = self._processutils.kill_process_on_job_close(
|
|
worker.pid)
|
|
except Exception:
|
|
LOG.exception("Could not associate child process "
|
|
"with a job, killing it.")
|
|
worker.kill()
|
|
raise
|
|
|
|
self._worker_job_handles.append(job_handle)
|
|
self._workers.append(worker)
|
|
|
|
def _add_signal_handlers(self):
|
|
self._signal_handler.add_handler('SIGINT', self._terminate)
|
|
self._signal_handler.add_handler('SIGTERM', self._terminate)
|
|
|
|
def _terminate(self, *args):
|
|
# We've already assigned win32 job objects to child processes,
|
|
# requesting them to stop once all the job handles are closed.
|
|
# When this process dies, so will the child processes.
|
|
LOG.info("Received request to terminate.")
|
|
sys.exit(1)
|
|
|
|
def wait(self):
|
|
pids = [worker.pid for worker in self._workers]
|
|
if pids:
|
|
self._processutils.wait_for_multiple_processes(pids,
|
|
wait_all=True)
|
|
# By sleeping here, we allow signal handlers to be executed.
|
|
time.sleep(0)
|