# 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('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: :_listen: The address on which to listen :_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.warn(_('Attempting fallback to old Quantum api-paste config')) service = cls.create('quantum') service.start() except Exception: LOG.exception(_('In serve_wsgi()')) 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) # 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._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