399 lines
15 KiB
Python
399 lines
15 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# 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 os
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import random
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import sys
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from oslo.config import cfg
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from nova import conductor
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from nova import context
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from nova import exception
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from nova.openstack.common.gettextutils import _
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from nova.openstack.common import importutils
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from nova.openstack.common import log as logging
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from nova.openstack.common import rpc
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from nova.openstack.common import service
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from nova import servicegroup
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from nova import utils
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from nova import version
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from nova 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='seconds between nodes reporting state to datastore'),
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cfg.BoolOpt('periodic_enable',
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default=True,
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help='enable 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.ListOpt('enabled_apis',
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default=['ec2', 'osapi_compute', 'metadata'],
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help='a list of APIs to enable by default'),
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cfg.ListOpt('enabled_ssl_apis',
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default=[],
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help='a list of APIs with enabled SSL'),
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cfg.StrOpt('ec2_listen',
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default="0.0.0.0",
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help='IP address for EC2 API to listen'),
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cfg.IntOpt('ec2_listen_port',
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default=8773,
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help='port for ec2 api to listen'),
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cfg.IntOpt('ec2_workers',
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help='Number of workers for EC2 API service'),
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cfg.StrOpt('osapi_compute_listen',
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default="0.0.0.0",
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help='IP address for OpenStack API to listen'),
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cfg.IntOpt('osapi_compute_listen_port',
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default=8774,
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help='list port for osapi compute'),
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cfg.IntOpt('osapi_compute_workers',
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help='Number of workers for OpenStack API service'),
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cfg.StrOpt('metadata_manager',
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default='nova.api.manager.MetadataManager',
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help='OpenStack metadata service manager'),
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cfg.StrOpt('metadata_listen',
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default="0.0.0.0",
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help='IP address for metadata api to listen'),
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cfg.IntOpt('metadata_listen_port',
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default=8775,
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help='port for metadata api to listen'),
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cfg.IntOpt('metadata_workers',
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help='Number of workers for metadata service'),
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cfg.StrOpt('compute_manager',
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default='nova.compute.manager.ComputeManager',
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help='full class name for the Manager for compute'),
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cfg.StrOpt('console_manager',
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default='nova.console.manager.ConsoleProxyManager',
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help='full class name for the Manager for console proxy'),
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cfg.StrOpt('cert_manager',
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default='nova.cert.manager.CertManager',
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help='full class name for the Manager for cert'),
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cfg.StrOpt('network_manager',
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default='nova.network.manager.VlanManager',
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help='full class name for the Manager for network'),
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cfg.StrOpt('scheduler_manager',
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default='nova.scheduler.manager.SchedulerManager',
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help='full class name for the Manager for scheduler'),
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cfg.IntOpt('service_down_time',
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default=60,
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help='maximum time since last check-in for up service'),
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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.import_opt('host', 'nova.netconf')
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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_enable=None, periodic_fuzzy_delay=None,
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periodic_interval_max=None, db_allowed=True,
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*args, **kwargs):
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super(Service, self).__init__()
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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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# NOTE(russellb) We want to make sure to create the servicegroup API
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# instance early, before creating other things such as the manager,
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# that will also create a servicegroup API instance. Internally, the
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# servicegroup only allocates a single instance of the driver API and
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# we want to make sure that our value of db_allowed is there when it
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# gets created. For that to happen, this has to be the first instance
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# of the servicegroup API.
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self.servicegroup_api = servicegroup.API(db_allowed=db_allowed)
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manager_class = importutils.import_class(self.manager_class_name)
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self.manager = manager_class(host=self.host, *args, **kwargs)
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self.report_interval = report_interval
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self.periodic_enable = periodic_enable
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self.periodic_fuzzy_delay = periodic_fuzzy_delay
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self.periodic_interval_max = periodic_interval_max
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self.saved_args, self.saved_kwargs = args, kwargs
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self.backdoor_port = None
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self.conductor_api = conductor.API(use_local=db_allowed)
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self.conductor_api.wait_until_ready(context.get_admin_context())
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def start(self):
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verstr = version.version_string_with_package()
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LOG.audit(_('Starting %(topic)s node (version %(version)s)'),
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{'topic': self.topic, 'version': verstr})
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self.basic_config_check()
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self.manager.init_host()
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self.model_disconnected = False
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ctxt = context.get_admin_context()
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try:
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self.service_ref = self.conductor_api.service_get_by_args(ctxt,
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self.host, self.binary)
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self.service_id = self.service_ref['id']
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except exception.NotFound:
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self.service_ref = self._create_service_ref(ctxt)
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self.manager.pre_start_hook()
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if self.backdoor_port is not None:
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self.manager.backdoor_port = self.backdoor_port
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self.conn = rpc.create_connection(new=True)
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LOG.debug(_("Creating Consumer connection for Service %s") %
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self.topic)
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rpc_dispatcher = self.manager.create_rpc_dispatcher(self.backdoor_port)
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# Share this same connection for these Consumers
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self.conn.create_consumer(self.topic, rpc_dispatcher, fanout=False)
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node_topic = '%s.%s' % (self.topic, self.host)
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self.conn.create_consumer(node_topic, rpc_dispatcher, fanout=False)
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self.conn.create_consumer(self.topic, rpc_dispatcher, fanout=True)
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# Consume from all consumers in a thread
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self.conn.consume_in_thread()
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self.manager.post_start_hook()
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LOG.debug(_("Join ServiceGroup membership for this service %s")
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% self.topic)
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# Add service to the ServiceGroup membership group.
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self.servicegroup_api.join(self.host, self.topic, self)
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if self.periodic_enable:
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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_dynamic_timer(self.periodic_tasks,
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initial_delay=initial_delay,
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periodic_interval_max=
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self.periodic_interval_max)
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def _create_service_ref(self, context):
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svc_values = {
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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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}
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service = self.conductor_api.service_create(context, svc_values)
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self.service_id = service['id']
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return service
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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_enable=None,
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periodic_fuzzy_delay=None, periodic_interval_max=None,
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db_allowed=True):
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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 - 'nova-' 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_enable: defaults to CONF.periodic_enable
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:param periodic_fuzzy_delay: defaults to CONF.periodic_fuzzy_delay
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:param periodic_interval_max: if set, the max time to wait between runs
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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(sys.argv[0])
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if not topic:
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topic = binary.rpartition('nova-')[2]
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if not manager:
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manager_cls = ('%s_manager' %
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binary.rpartition('nova-')[2])
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manager = CONF.get(manager_cls, 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_enable is None:
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periodic_enable = CONF.periodic_enable
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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_enable=periodic_enable,
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periodic_fuzzy_delay=periodic_fuzzy_delay,
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periodic_interval_max=periodic_interval_max,
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db_allowed=db_allowed)
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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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self.conductor_api.service_destroy(context.get_admin_context(),
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self.service_id)
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except exception.NotFound:
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LOG.warn(_('Service killed that has no database entry'))
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def stop(self):
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try:
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self.conn.close()
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except Exception:
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pass
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super(Service, self).stop()
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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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return self.manager.periodic_tasks(ctxt, raise_on_error=raise_on_error)
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def basic_config_check(self):
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"""Perform basic config checks before starting processing."""
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# Make sure the tempdir exists and is writable
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try:
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with utils.tempdir():
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pass
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except Exception as e:
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LOG.error(_('Temporary directory is invalid: %s'), e)
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sys.exit(1)
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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, use_ssl=False, max_url_len=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)
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self.use_ssl = use_ssl
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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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use_ssl=self.use_ssl,
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max_url_len=max_url_len)
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# Pull back actual port used
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self.port = self.server.port
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self.backdoor_port = None
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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.manager.pre_start_hook()
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if self.backdoor_port is not None:
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self.manager.backdoor_port = self.backdoor_port
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self.server.start()
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if self.manager:
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self.manager.post_start_hook()
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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 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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_launcher.wait()
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