Sync service and threadgroup modules from oslo
blueprint use-oslo-services Change-Id: I8641dbed0a83a6d57c0b6c1a02796eb3e633fafd
This commit is contained in:
Brian Elliott
parent
e4f05bada6
commit
1298b1880a
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@ -41,6 +41,8 @@ import json
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import types
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import xmlrpclib
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import six
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from nova.openstack.common import timeutils
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@ -93,7 +95,7 @@ def to_primitive(value, convert_instances=False, convert_datetime=True,
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# value of itertools.count doesn't get caught by nasty_type_tests
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# and results in infinite loop when list(value) is called.
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if type(value) == itertools.count:
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return unicode(value)
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return six.text_type(value)
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# FIXME(vish): Workaround for LP bug 852095. Without this workaround,
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# tests that raise an exception in a mocked method that
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@ -137,12 +139,12 @@ def to_primitive(value, convert_instances=False, convert_datetime=True,
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return recursive(value.__dict__, level=level + 1)
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else:
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if any(test(value) for test in _nasty_type_tests):
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return unicode(value)
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return six.text_type(value)
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return value
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except TypeError:
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# Class objects are tricky since they may define something like
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# __iter__ defined but it isn't callable as list().
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return unicode(value)
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return six.text_type(value)
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def dumps(value, default=to_primitive, **kwargs):
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@ -43,9 +43,9 @@ import traceback
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from oslo.config import cfg
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from nova.openstack.common.gettextutils import _
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from nova.openstack.common import importutils
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from nova.openstack.common import jsonutils
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from nova.openstack.common import local
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from nova.openstack.common import notifier
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_DEFAULT_LOG_DATE_FORMAT = "%Y-%m-%d %H:%M:%S"
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@ -322,17 +322,6 @@ class JSONFormatter(logging.Formatter):
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return jsonutils.dumps(message)
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class PublishErrorsHandler(logging.Handler):
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def emit(self, record):
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if ('nova.openstack.common.notifier.log_notifier' in
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CONF.notification_driver):
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return
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notifier.api.notify(None, 'error.publisher',
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'error_notification',
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notifier.api.ERROR,
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dict(error=record.msg))
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def _create_logging_excepthook(product_name):
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def logging_excepthook(type, value, tb):
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extra = {}
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@ -428,7 +417,10 @@ def _setup_logging_from_conf():
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log_root.addHandler(streamlog)
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if CONF.publish_errors:
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log_root.addHandler(PublishErrorsHandler(logging.ERROR))
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handler = importutils.import_object(
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"nova.openstack.common.log_handler.PublishErrorsHandler",
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logging.ERROR)
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log_root.addHandler(handler)
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datefmt = CONF.log_date_format
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for handler in log_root.handlers:
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@ -123,7 +123,7 @@ def execute(*cmd, **kwargs):
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elif isinstance(check_exit_code, int):
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check_exit_code = [check_exit_code]
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if len(kwargs):
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if kwargs:
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raise UnknownArgumentError(_('Got unknown keyword args '
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'to utils.execute: %r') % kwargs)
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@ -0,0 +1,333 @@
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# 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 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 logging as std_logging
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from oslo.config import cfg
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from nova.openstack.common import eventlet_backdoor
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from nova.openstack.common.gettextutils import _
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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 threadgroup
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rpc = importutils.try_import('nova.openstack.common.rpc')
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CONF = cfg.CONF
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LOG = logging.getLogger(__name__)
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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 = threadgroup.ThreadGroup()
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self.backdoor_port = eventlet_backdoor.initialize_if_enabled()
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@staticmethod
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def run_service(service):
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"""Start and wait for a service to finish.
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:param service: service to run and wait for.
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:returns: None
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"""
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service.start()
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service.wait()
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def launch_service(self, service):
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"""Load and start the given service.
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:param service: The service you would like to start.
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:returns: None
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"""
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service.backdoor_port = self.backdoor_port
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self._services.add_thread(self.run_service, service)
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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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self._services.stop()
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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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self._services.wait()
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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 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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CONF.log_opt_values(LOG, std_logging.DEBUG)
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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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if rpc:
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rpc.cleanup()
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self.stop()
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return status
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class ServiceWrapper(object):
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def __init__(self, service, workers):
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self.service = service
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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, service):
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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_n(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_service(service)
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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.service)
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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.service.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_service(self, service, workers=1):
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wrap = ServiceWrapper(service, 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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# Don't block if no child processes have exited
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pid, status = os.waitpid(0, os.WNOHANG)
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if not pid:
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return None
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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'),
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dict(pid=pid, sig=sig))
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else:
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code = os.WEXITSTATUS(status)
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LOG.info(_('Child %(pid)s exited with status %(code)d'),
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dict(pid=pid, code=code))
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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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LOG.debug(_('Full set of CONF:'))
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CONF.log_opt_values(LOG, std_logging.DEBUG)
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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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# Yield to other threads if no children have exited
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# Sleep for a short time to avoid excessive CPU usage
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# (see bug #1095346)
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eventlet.greenthread.sleep(.01)
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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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def __init__(self, threads=1000):
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self.tg = threadgroup.ThreadGroup(threads)
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def start(self):
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pass
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def stop(self):
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self.tg.stop()
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def wait(self):
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self.tg.wait()
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def launch(service, workers=None):
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if workers:
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launcher = ProcessLauncher()
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launcher.launch_service(service, workers=workers)
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else:
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launcher = ServiceLauncher()
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launcher.launch_service(service)
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return launcher
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@ -0,0 +1,121 @@
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# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2012 Red Hat, Inc.
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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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from eventlet import greenlet
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from eventlet import greenpool
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from eventlet import greenthread
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from nova.openstack.common import log as logging
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from nova.openstack.common import loopingcall
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LOG = logging.getLogger(__name__)
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def _thread_done(gt, *args, **kwargs):
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""" Callback function to be passed to GreenThread.link() when we spawn()
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Calls the :class:`ThreadGroup` to notify if.
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"""
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kwargs['group'].thread_done(kwargs['thread'])
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class Thread(object):
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""" Wrapper around a greenthread, that holds a reference to the
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:class:`ThreadGroup`. The Thread will notify the :class:`ThreadGroup` when
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it has done so it can be removed from the threads list.
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"""
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def __init__(self, thread, group):
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self.thread = thread
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self.thread.link(_thread_done, group=group, thread=self)
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def stop(self):
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self.thread.kill()
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def wait(self):
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return self.thread.wait()
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class ThreadGroup(object):
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""" The point of the ThreadGroup classis to:
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* keep track of timers and greenthreads (making it easier to stop them
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when need be).
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* provide an easy API to add timers.
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"""
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def __init__(self, thread_pool_size=10):
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self.pool = greenpool.GreenPool(thread_pool_size)
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self.threads = []
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self.timers = []
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def add_dynamic_timer(self, callback, initial_delay=None,
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periodic_interval_max=None, *args, **kwargs):
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timer = loopingcall.DynamicLoopingCall(callback, *args, **kwargs)
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timer.start(initial_delay=initial_delay,
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periodic_interval_max=periodic_interval_max)
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self.timers.append(timer)
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def add_timer(self, interval, callback, initial_delay=None,
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*args, **kwargs):
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pulse = loopingcall.FixedIntervalLoopingCall(callback, *args, **kwargs)
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pulse.start(interval=interval,
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initial_delay=initial_delay)
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self.timers.append(pulse)
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def add_thread(self, callback, *args, **kwargs):
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gt = self.pool.spawn(callback, *args, **kwargs)
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th = Thread(gt, self)
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self.threads.append(th)
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def thread_done(self, thread):
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self.threads.remove(thread)
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def stop(self):
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current = greenthread.getcurrent()
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for x in self.threads:
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||||
if x is current:
|
||||
# don't kill the current thread.
|
||||
continue
|
||||
try:
|
||||
x.stop()
|
||||
except Exception as ex:
|
||||
LOG.exception(ex)
|
||||
|
||||
for x in self.timers:
|
||||
try:
|
||||
x.stop()
|
||||
except Exception as ex:
|
||||
LOG.exception(ex)
|
||||
self.timers = []
|
||||
|
||||
def wait(self):
|
||||
for x in self.timers:
|
||||
try:
|
||||
x.wait()
|
||||
except greenlet.GreenletExit:
|
||||
pass
|
||||
except Exception as ex:
|
||||
LOG.exception(ex)
|
||||
current = greenthread.getcurrent()
|
||||
for x in self.threads:
|
||||
if x is current:
|
||||
continue
|
||||
try:
|
||||
x.wait()
|
||||
except greenlet.GreenletExit:
|
||||
pass
|
||||
except Exception as ex:
|
||||
LOG.exception(ex)
|
||||
|
|
@ -27,7 +27,9 @@ module=processutils
|
|||
module=redhat-eventlet.patch
|
||||
module=rootwrap
|
||||
module=rpc
|
||||
module=service
|
||||
module=strutils
|
||||
module=threadgroup
|
||||
module=timeutils
|
||||
module=uuidutils
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue