690 lines
24 KiB
Python
690 lines
24 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 errno
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import inspect
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import os
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import random
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import signal
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import sys
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import time
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import eventlet
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import greenlet
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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 import cfg
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from nova.openstack.common import eventlet_backdoor
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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 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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default=None,
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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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default=None,
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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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default=None,
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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 SignalExit(SystemExit):
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def __init__(self, signo, exccode=1):
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super(SignalExit, self).__init__(exccode)
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self.signo = signo
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class Launcher(object):
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"""Launch one or more services and wait for them to complete."""
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def __init__(self):
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"""Initialize the service launcher.
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:returns: None
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"""
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self._services = []
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self.backdoor_port = eventlet_backdoor.initialize_if_enabled()
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@staticmethod
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def run_server(server):
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"""Start and wait for a server to finish.
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:param service: Server to run and wait for.
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:returns: None
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"""
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server.start()
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server.wait()
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def launch_server(self, server):
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"""Load and start the given server.
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:param server: The server you would like to start.
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:returns: None
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"""
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if self.backdoor_port is not None:
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server.backdoor_port = self.backdoor_port
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gt = eventlet.spawn(self.run_server, server)
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self._services.append(gt)
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def stop(self):
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"""Stop all services which are currently running.
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:returns: None
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"""
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for service in self._services:
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service.kill()
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def wait(self):
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"""Waits until all services have been stopped, and then returns.
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:returns: None
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"""
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for service in self._services:
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try:
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service.wait()
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except greenlet.GreenletExit:
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pass
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class ServiceLauncher(Launcher):
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def _handle_signal(self, signo, frame):
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# Allow the process to be killed again and die from natural causes
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signal.signal(signal.SIGTERM, signal.SIG_DFL)
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signal.signal(signal.SIGINT, signal.SIG_DFL)
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raise SignalExit(signo)
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def wait(self):
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signal.signal(signal.SIGTERM, self._handle_signal)
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signal.signal(signal.SIGINT, self._handle_signal)
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LOG.debug(_('Full set of CONF:'))
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for flag in CONF:
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flag_get = CONF.get(flag, None)
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# hide flag contents from log if contains a password
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# should use secret flag when switch over to openstack-common
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if ("_password" in flag or "_key" in flag or
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(flag == "sql_connection" and "mysql:" in flag_get)):
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LOG.debug(_('%(flag)s : FLAG SET ') % locals())
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else:
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LOG.debug('%(flag)s : %(flag_get)s' % locals())
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status = None
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try:
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super(ServiceLauncher, self).wait()
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except SignalExit as exc:
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signame = {signal.SIGTERM: 'SIGTERM',
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signal.SIGINT: 'SIGINT'}[exc.signo]
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LOG.info(_('Caught %s, exiting'), signame)
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status = exc.code
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except SystemExit as exc:
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status = exc.code
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finally:
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self.stop()
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rpc.cleanup()
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if status is not None:
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sys.exit(status)
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class ServerWrapper(object):
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def __init__(self, server, workers):
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self.server = server
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self.workers = workers
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self.children = set()
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self.forktimes = []
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class ProcessLauncher(object):
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def __init__(self):
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self.children = {}
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self.sigcaught = None
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self.running = True
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rfd, self.writepipe = os.pipe()
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self.readpipe = eventlet.greenio.GreenPipe(rfd, 'r')
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signal.signal(signal.SIGTERM, self._handle_signal)
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signal.signal(signal.SIGINT, self._handle_signal)
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def _handle_signal(self, signo, frame):
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self.sigcaught = signo
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self.running = False
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# Allow the process to be killed again and die from natural causes
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signal.signal(signal.SIGTERM, signal.SIG_DFL)
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signal.signal(signal.SIGINT, signal.SIG_DFL)
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def _pipe_watcher(self):
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# This will block until the write end is closed when the parent
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# dies unexpectedly
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self.readpipe.read()
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LOG.info(_('Parent process has died unexpectedly, exiting'))
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sys.exit(1)
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def _child_process(self, server):
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# Setup child signal handlers differently
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def _sigterm(*args):
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signal.signal(signal.SIGTERM, signal.SIG_DFL)
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raise SignalExit(signal.SIGTERM)
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signal.signal(signal.SIGTERM, _sigterm)
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# Block SIGINT and let the parent send us a SIGTERM
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signal.signal(signal.SIGINT, signal.SIG_IGN)
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# Reopen the eventlet hub to make sure we don't share an epoll
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# fd with parent and/or siblings, which would be bad
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eventlet.hubs.use_hub()
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# Close write to ensure only parent has it open
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os.close(self.writepipe)
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# Create greenthread to watch for parent to close pipe
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eventlet.spawn(self._pipe_watcher)
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# Reseed random number generator
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random.seed()
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launcher = Launcher()
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launcher.run_server(server)
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def _start_child(self, wrap):
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if len(wrap.forktimes) > wrap.workers:
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# Limit ourselves to one process a second (over the period of
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# number of workers * 1 second). This will allow workers to
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# start up quickly but ensure we don't fork off children that
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# die instantly too quickly.
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if time.time() - wrap.forktimes[0] < wrap.workers:
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LOG.info(_('Forking too fast, sleeping'))
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time.sleep(1)
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wrap.forktimes.pop(0)
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wrap.forktimes.append(time.time())
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pid = os.fork()
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if pid == 0:
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# NOTE(johannes): All exceptions are caught to ensure this
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# doesn't fallback into the loop spawning children. It would
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# be bad for a child to spawn more children.
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status = 0
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try:
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self._child_process(wrap.server)
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except SignalExit as exc:
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signame = {signal.SIGTERM: 'SIGTERM',
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signal.SIGINT: 'SIGINT'}[exc.signo]
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LOG.info(_('Caught %s, exiting'), signame)
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status = exc.code
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except SystemExit as exc:
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status = exc.code
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except BaseException:
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LOG.exception(_('Unhandled exception'))
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status = 2
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finally:
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wrap.server.stop()
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os._exit(status)
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LOG.info(_('Started child %d'), pid)
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wrap.children.add(pid)
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self.children[pid] = wrap
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return pid
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def launch_server(self, server, workers=1):
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wrap = ServerWrapper(server, workers)
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LOG.info(_('Starting %d workers'), wrap.workers)
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while self.running and len(wrap.children) < wrap.workers:
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self._start_child(wrap)
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def _wait_child(self):
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try:
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pid, status = os.wait()
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except OSError as exc:
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if exc.errno not in (errno.EINTR, errno.ECHILD):
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raise
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return None
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if os.WIFSIGNALED(status):
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sig = os.WTERMSIG(status)
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LOG.info(_('Child %(pid)d killed by signal %(sig)d'), locals())
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else:
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code = os.WEXITSTATUS(status)
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LOG.info(_('Child %(pid)d exited with status %(code)d'), locals())
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if pid not in self.children:
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LOG.warning(_('pid %d not in child list'), pid)
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return None
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wrap = self.children.pop(pid)
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wrap.children.remove(pid)
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return wrap
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def wait(self):
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"""Loop waiting on children to die and respawning as necessary."""
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while self.running:
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wrap = self._wait_child()
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if not wrap:
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continue
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while self.running and len(wrap.children) < wrap.workers:
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self._start_child(wrap)
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if self.sigcaught:
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signame = {signal.SIGTERM: 'SIGTERM',
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signal.SIGINT: 'SIGINT'}[self.sigcaught]
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LOG.info(_('Caught %s, stopping children'), signame)
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for pid in self.children:
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try:
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os.kill(pid, signal.SIGTERM)
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except OSError as exc:
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if exc.errno != errno.ESRCH:
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raise
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# Wait for children to die
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if self.children:
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LOG.info(_('Waiting on %d children to exit'), len(self.children))
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while self.children:
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self._wait_child()
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class Service(object):
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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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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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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.timers = []
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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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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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self.manager.pre_start_hook(rpc_connection=self.conn)
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rpc_dispatcher = self.manager.create_rpc_dispatcher()
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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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pulse = self.servicegroup_api.join(self.host, self.topic, self)
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if pulse:
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self.timers.append(pulse)
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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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periodic = utils.DynamicLoopingCall(self.periodic_tasks)
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periodic.start(initial_delay=initial_delay,
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periodic_interval_max=self.periodic_interval_max)
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self.timers.append(periodic)
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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(inspect.stack()[-1][1])
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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:
|
|
periodic_enable = CONF.periodic_enable
|
|
if periodic_fuzzy_delay is None:
|
|
periodic_fuzzy_delay = CONF.periodic_fuzzy_delay
|
|
service_obj = cls(host, binary, topic, manager,
|
|
report_interval=report_interval,
|
|
periodic_enable=periodic_enable,
|
|
periodic_fuzzy_delay=periodic_fuzzy_delay,
|
|
periodic_interval_max=periodic_interval_max,
|
|
db_allowed=db_allowed)
|
|
|
|
return service_obj
|
|
|
|
def kill(self):
|
|
"""Destroy the service object in the datastore."""
|
|
self.stop()
|
|
try:
|
|
self.conductor_api.service_destroy(context.get_admin_context(),
|
|
self.service_id)
|
|
except exception.NotFound:
|
|
LOG.warn(_('Service killed that has no database entry'))
|
|
|
|
def stop(self):
|
|
# Try to shut the connection down, but if we get any sort of
|
|
# errors, go ahead and ignore them.. as we're shutting down anyway
|
|
try:
|
|
self.conn.close()
|
|
except Exception:
|
|
pass
|
|
for x in self.timers:
|
|
try:
|
|
x.stop()
|
|
except Exception:
|
|
pass
|
|
self.timers = []
|
|
|
|
def wait(self):
|
|
for x in self.timers:
|
|
try:
|
|
x.wait()
|
|
except Exception:
|
|
pass
|
|
|
|
def periodic_tasks(self, raise_on_error=False):
|
|
"""Tasks to be run at a periodic interval."""
|
|
ctxt = context.get_admin_context()
|
|
return self.manager.periodic_tasks(ctxt, raise_on_error=raise_on_error)
|
|
|
|
def basic_config_check(self):
|
|
"""Perform basic config checks before starting processing."""
|
|
# Make sure the tempdir exists and is writable
|
|
try:
|
|
with utils.tempdir() as tmpdir:
|
|
pass
|
|
except Exception as e:
|
|
LOG.error(_('Temporary directory is invalid: %s'), e)
|
|
sys.exit(1)
|
|
|
|
|
|
class WSGIService(object):
|
|
"""Provides ability to launch API from a 'paste' configuration."""
|
|
|
|
def __init__(self, name, loader=None, use_ssl=False, max_url_len=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()
|
|
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.workers = getattr(CONF, '%s_workers' % name, None)
|
|
self.use_ssl = use_ssl
|
|
self.server = wsgi.Server(name,
|
|
self.app,
|
|
host=self.host,
|
|
port=self.port,
|
|
use_ssl=self.use_ssl,
|
|
max_url_len=max_url_len)
|
|
# Pull back actual port used
|
|
self.port = self.server.port
|
|
self.backdoor_port = None
|
|
|
|
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 not fl 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.manager.pre_start_hook()
|
|
if self.backdoor_port is not None:
|
|
self.manager.backdoor_port = self.backdoor_port
|
|
self.server.start()
|
|
if self.manager:
|
|
self.manager.post_start_hook()
|
|
|
|
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()
|
|
|
|
|
|
# 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'))
|
|
|
|
if workers:
|
|
_launcher = ProcessLauncher()
|
|
_launcher.launch_server(server, workers=workers)
|
|
else:
|
|
_launcher = ServiceLauncher()
|
|
_launcher.launch_server(server)
|
|
|
|
|
|
def wait():
|
|
_launcher.wait()
|