244 lines
8.2 KiB
Python
244 lines
8.2 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
|
|
|
|
# Copyright 2011 Nicira Networks, 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 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.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 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('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:
|
|
LOG.exception(_('Unrecoverable error: please check log for details.'))
|
|
raise
|
|
|
|
return service
|
|
|
|
|
|
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
|