237 lines
8.0 KiB
Python
237 lines
8.0 KiB
Python
# Copyright 2011 VMware, Inc
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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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import inspect
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import logging as std_logging
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import os
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import random
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from oslo_config import cfg
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from tacker.common import config
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from tacker.common import rpc_compat
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from tacker import context
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from tacker.openstack.common import excutils
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from tacker.openstack.common import importutils
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from tacker.openstack.common import log as logging
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from tacker.openstack.common import loopingcall
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from tacker import wsgi
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service_opts = [
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cfg.IntOpt('periodic_interval',
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default=40,
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help=_('Seconds between running periodic tasks')),
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cfg.IntOpt('api_workers',
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default=0,
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help=_('Number of separate worker processes for service')),
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cfg.IntOpt('periodic_fuzzy_delay',
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default=5,
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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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]
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CONF = cfg.CONF
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CONF.register_opts(service_opts)
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LOG = logging.getLogger(__name__)
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class WsgiService(object):
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"""Base class for WSGI based services.
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For each api you define, you must also define these flags:
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:<api>_listen: The address on which to listen
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:<api>_listen_port: The port on which to listen
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"""
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def __init__(self, app_name):
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self.app_name = app_name
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self.wsgi_app = None
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def start(self):
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self.wsgi_app = _run_wsgi(self.app_name)
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def wait(self):
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self.wsgi_app.wait()
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class TackerApiService(WsgiService):
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"""Class for tacker-api service."""
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@classmethod
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def create(cls, app_name='tacker'):
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# Setup logging early, supplying both the CLI options and the
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# configuration mapping from the config file
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# We only update the conf dict for the verbose and debug
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# flags. Everything else must be set up in the conf file...
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# Log the options used when starting if we're in debug mode...
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config.setup_logging(cfg.CONF)
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# Dump the initial option values
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cfg.CONF.log_opt_values(LOG, std_logging.DEBUG)
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service = cls(app_name)
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return service
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def serve_wsgi(cls):
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try:
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service = cls.create()
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service.start()
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except Exception:
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with excutils.save_and_reraise_exception():
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LOG.exception(_('Unrecoverable error: please check log '
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'for details.'))
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return service
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def _run_wsgi(app_name):
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app = config.load_paste_app(app_name)
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if not app:
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LOG.error(_('No known API applications configured.'))
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return
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server = wsgi.Server("Tacker")
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server.start(app, cfg.CONF.bind_port, cfg.CONF.bind_host,
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workers=cfg.CONF.api_workers)
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# Dump all option values here after all options are parsed
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cfg.CONF.log_opt_values(LOG, std_logging.DEBUG)
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LOG.info(_("Tacker service started, listening on %(host)s:%(port)s"),
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{'host': cfg.CONF.bind_host,
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'port': cfg.CONF.bind_port})
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return server
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class Service(rpc_compat.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.
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"""
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def __init__(self, host, binary, topic, manager, report_interval=None,
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periodic_interval=None, periodic_fuzzy_delay=None,
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*args, **kwargs):
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self.binary = binary
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self.manager_class_name = manager
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manager_class = importutils.import_class(self.manager_class_name)
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self.manager = manager_class(host=host, *args, **kwargs)
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self.report_interval = report_interval
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self.periodic_interval = periodic_interval
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self.periodic_fuzzy_delay = periodic_fuzzy_delay
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self.saved_args, self.saved_kwargs = args, kwargs
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self.timers = []
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super(Service, self).__init__(host, topic, manager=self.manager)
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def start(self):
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self.manager.init_host()
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super(Service, self).start()
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if self.report_interval:
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pulse = loopingcall.FixedIntervalLoopingCall(self.report_state)
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pulse.start(interval=self.report_interval,
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initial_delay=self.report_interval)
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self.timers.append(pulse)
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if self.periodic_interval:
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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 = loopingcall.FixedIntervalLoopingCall(
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self.periodic_tasks)
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periodic.start(interval=self.periodic_interval,
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initial_delay=initial_delay)
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self.timers.append(periodic)
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self.manager.after_start()
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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_interval=None,
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periodic_fuzzy_delay=None):
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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_interval: defaults to CONF.periodic_interval
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:param periodic_fuzzy_delay: defaults to CONF.periodic_fuzzy_delay
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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('tacker-')[2]
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topic = topic.replace("-", "_")
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if not manager:
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manager = CONF.get('%s_manager' % topic, 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_interval is None:
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periodic_interval = CONF.periodic_interval
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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_interval=periodic_interval,
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periodic_fuzzy_delay=periodic_fuzzy_delay)
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return service_obj
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def kill(self):
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"""Destroy the service object."""
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self.stop()
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def stop(self):
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super(Service, self).stop()
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for x in self.timers:
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try:
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x.stop()
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except Exception:
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LOG.exception(_("Exception occurs when timer stops"))
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pass
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self.timers = []
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def wait(self):
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super(Service, self).wait()
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for x in self.timers:
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try:
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x.wait()
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except Exception:
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LOG.exception(_("Exception occurs when waiting for timer"))
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pass
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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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self.manager.periodic_tasks(ctxt, raise_on_error=raise_on_error)
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def report_state(self):
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"""Update the state of this service."""
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# Todo(gongysh) report state to tacker server
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pass
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