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neutron/neutron/service.py

307 lines
11 KiB

# Copyright 2011 VMware, Inc
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import eventlet
import inspect
import logging as std_logging
import os
import random
from oslo.config import cfg
from neutron.common import config
from neutron.common import legacy
from neutron import context
from neutron import manager
from neutron import neutron_plugin_base_v2
from neutron.openstack.common.db.sqlalchemy import session
from neutron.openstack.common import excutils
from neutron.openstack.common import importutils
from neutron.openstack.common import log as logging
from neutron.openstack.common import loopingcall
from neutron.openstack.common.rpc import service
from neutron.openstack.common.service import ProcessLauncher
from neutron import wsgi
service_opts = [
cfg.IntOpt('periodic_interval',
default=40,
help=_('Seconds between running periodic tasks')),
cfg.IntOpt('api_workers',
default=0,
help=_('Number of separate worker processes for service')),
cfg.IntOpt('rpc_workers',
default=0,
help=_('Number of RPC worker processes for service')),
cfg.IntOpt('periodic_fuzzy_delay',
default=5,
help=_('Range of seconds to randomly delay when starting the '
'periodic task scheduler to reduce stampeding. '
'(Disable by setting to 0)')),
]
CONF = cfg.CONF
CONF.register_opts(service_opts)
LOG = logging.getLogger(__name__)
class WsgiService(object):
"""Base class for WSGI based services.
For each api you define, you must also define these flags:
:<api>_listen: The address on which to listen
:<api>_listen_port: The port on which to listen
"""
def __init__(self, app_name):
self.app_name = app_name
self.wsgi_app = None
def start(self):
self.wsgi_app = _run_wsgi(self.app_name)
def wait(self):
self.wsgi_app.wait()
class NeutronApiService(WsgiService):
"""Class for neutron-api service."""
@classmethod
def create(cls, app_name='neutron'):
# Setup logging early, supplying both the CLI options and the
# configuration mapping from the config file
# We only update the conf dict for the verbose and debug
# flags. Everything else must be set up in the conf file...
# Log the options used when starting if we're in debug mode...
config.setup_logging(cfg.CONF)
legacy.modernize_quantum_config(cfg.CONF)
# Dump the initial option values
cfg.CONF.log_opt_values(LOG, std_logging.DEBUG)
service = cls(app_name)
return service
def serve_wsgi(cls):
try:
try:
service = cls.create()
service.start()
except RuntimeError:
LOG.exception(_('Error occurred: trying old api-paste.ini.'))
service = cls.create('quantum')
service.start()
except Exception:
with excutils.save_and_reraise_exception():
LOG.exception(_('Unrecoverable error: please check log '
'for details.'))
return service
class RpcWorker(object):
"""Wraps a worker to be handled by ProcessLauncher"""
def __init__(self, plugin):
self._plugin = plugin
self._server = None
def start(self):
# We may have just forked from parent process. A quick disposal of the
# existing sql connections avoids producing errors later when they are
# discovered to be broken.
session.get_engine(sqlite_fk=True).pool.dispose()
self._server = self._plugin.start_rpc_listener()
def wait(self):
if isinstance(self._server, eventlet.greenthread.GreenThread):
self._server.wait()
def stop(self):
if isinstance(self._server, eventlet.greenthread.GreenThread):
self._server.kill()
self._server = None
def serve_rpc():
plugin = manager.NeutronManager.get_plugin()
# If 0 < rpc_workers then start_rpc_listener would be called in a
# subprocess and we cannot simply catch the NotImplementedError. It is
# simpler to check this up front by testing whether the plugin overrides
# start_rpc_listener.
base = neutron_plugin_base_v2.NeutronPluginBaseV2
if plugin.__class__.start_rpc_listener == base.start_rpc_listener:
LOG.debug(_("Active plugin doesn't implement start_rpc_listener"))
if 0 < cfg.CONF.rpc_workers:
msg = _("'rpc_workers = %d' ignored because start_rpc_listener "
"is not implemented.")
LOG.error(msg, cfg.CONF.rpc_workers)
raise NotImplementedError
try:
rpc = RpcWorker(plugin)
if cfg.CONF.rpc_workers < 1:
rpc.start()
return rpc
else:
launcher = ProcessLauncher(wait_interval=1.0)
launcher.launch_service(rpc, workers=cfg.CONF.rpc_workers)
return launcher
except Exception:
with excutils.save_and_reraise_exception():
LOG.exception(_('Unrecoverable error: please check log '
'for details.'))
def _run_wsgi(app_name):
app = config.load_paste_app(app_name)
if not app:
LOG.error(_('No known API applications configured.'))
return
server = wsgi.Server("Neutron")
server.start(app, cfg.CONF.bind_port, cfg.CONF.bind_host,
workers=cfg.CONF.api_workers)
# Dump all option values here after all options are parsed
cfg.CONF.log_opt_values(LOG, std_logging.DEBUG)
LOG.info(_("Neutron service started, listening on %(host)s:%(port)s"),
{'host': cfg.CONF.bind_host,
'port': cfg.CONF.bind_port})
return server
class Service(service.Service):
"""Service object for binaries running on hosts.
A service takes a manager and enables rpc by listening to queues based
on topic. It also periodically runs tasks on the manager.
"""
def __init__(self, host, binary, topic, manager, report_interval=None,
periodic_interval=None, periodic_fuzzy_delay=None,
*args, **kwargs):
self.binary = binary
self.manager_class_name = manager
manager_class = importutils.import_class(self.manager_class_name)
self.manager = manager_class(host=host, *args, **kwargs)
self.report_interval = report_interval
self.periodic_interval = periodic_interval
self.periodic_fuzzy_delay = periodic_fuzzy_delay
self.saved_args, self.saved_kwargs = args, kwargs
self.timers = []
super(Service, self).__init__(host, topic, manager=self.manager)
def start(self):
self.manager.init_host()
super(Service, self).start()
if self.report_interval:
pulse = loopingcall.FixedIntervalLoopingCall(self.report_state)
pulse.start(interval=self.report_interval,
initial_delay=self.report_interval)
self.timers.append(pulse)
if self.periodic_interval:
if self.periodic_fuzzy_delay:
initial_delay = random.randint(0, self.periodic_fuzzy_delay)
else:
initial_delay = None
periodic = loopingcall.FixedIntervalLoopingCall(
self.periodic_tasks)
periodic.start(interval=self.periodic_interval,
initial_delay=initial_delay)
self.timers.append(periodic)
self.manager.after_start()
def __getattr__(self, key):
manager = self.__dict__.get('manager', None)
return getattr(manager, key)
@classmethod
def create(cls, host=None, binary=None, topic=None, manager=None,
report_interval=None, periodic_interval=None,
periodic_fuzzy_delay=None):
"""Instantiates class and passes back application object.
:param host: defaults to CONF.host
:param binary: defaults to basename of executable
:param topic: defaults to bin_name - 'nova-' part
:param manager: defaults to CONF.<topic>_manager
:param report_interval: defaults to CONF.report_interval
:param periodic_interval: defaults to CONF.periodic_interval
:param periodic_fuzzy_delay: defaults to CONF.periodic_fuzzy_delay
"""
if not host:
host = CONF.host
if not binary:
binary = os.path.basename(inspect.stack()[-1][1])
if not topic:
topic = binary.rpartition('neutron-')[2]
topic = topic.replace("-", "_")
if not manager:
manager = CONF.get('%s_manager' % topic, None)
if report_interval is None:
report_interval = CONF.report_interval
if periodic_interval is None:
periodic_interval = CONF.periodic_interval
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_interval=periodic_interval,
periodic_fuzzy_delay=periodic_fuzzy_delay)
return service_obj
def kill(self):
"""Destroy the service object."""
self.stop()
def stop(self):
super(Service, self).stop()
for x in self.timers:
try:
x.stop()
except Exception:
LOG.exception(_("Exception occurs when timer stops"))
pass
self.timers = []
def wait(self):
super(Service, self).wait()
for x in self.timers:
try:
x.wait()
except Exception:
LOG.exception(_("Exception occurs when waiting for timer"))
pass
def periodic_tasks(self, raise_on_error=False):
"""Tasks to be run at a periodic interval."""
ctxt = context.get_admin_context()
self.manager.periodic_tasks(ctxt, raise_on_error=raise_on_error)
def report_state(self):
"""Update the state of this service."""
# Todo(gongysh) report state to neutron server
pass