gantt/nova/service.py
Stanislaw Pitucha d843058d5f Improve external lock implementation
Remove a number of limitations from the external locks.
- They can be nested now
- They do not need external cleanup in case of failures
- They do not rely on lockfile or greenlet internal implementation

New implementation is based on fcntl locks and any crashing process
will drop the lock. It does not have to rely on any cleanup code or
handling exceptions. Because no cleanup is needed, a number of tests
have been removed.
This implementation is not portable outside of POSIX/BSD/SVR4 systems.

Fcntl locks should work correctly with NFS mounts.

Locks are cleaned up after the tests finish running via run_tests.sh,
even though it's not strictly needed.

This change requires eventlet >= 0.9.17.

bp improve-external-locking

Change-Id: Idf5424c04645f25097733848a007b150145b0b27
2012-08-04 12:52:50 +01:00

660 lines
22 KiB
Python

# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# Copyright 2011 Justin Santa Barbara
# 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.
"""Generic Node base class for all workers that run on hosts."""
import errno
import inspect
import os
import random
import signal
import sys
import time
import eventlet
import greenlet
from nova.common import eventlet_backdoor
from nova import context
from nova import db
from nova import exception
from nova import flags
from nova.openstack.common import cfg
from nova.openstack.common import importutils
from nova.openstack.common import log as logging
from nova.openstack.common import rpc
from nova import utils
from nova import version
from nova import wsgi
LOG = logging.getLogger(__name__)
service_opts = [
cfg.IntOpt('report_interval',
default=10,
help='seconds between nodes reporting state to datastore'),
cfg.IntOpt('periodic_interval',
default=60,
help='seconds between running periodic tasks'),
cfg.IntOpt('periodic_fuzzy_delay',
default=60,
help='range of seconds to randomly delay when starting the'
' periodic task scheduler to reduce stampeding.'
' (Disable by setting to 0)'),
cfg.StrOpt('ec2_listen',
default="0.0.0.0",
help='IP address for EC2 API to listen'),
cfg.IntOpt('ec2_listen_port',
default=8773,
help='port for ec2 api to listen'),
cfg.IntOpt('ec2_workers',
default=None,
help='Number of workers for EC2 API service'),
cfg.StrOpt('osapi_compute_listen',
default="0.0.0.0",
help='IP address for OpenStack API to listen'),
cfg.IntOpt('osapi_compute_listen_port',
default=8774,
help='list port for osapi compute'),
cfg.IntOpt('osapi_compute_workers',
default=None,
help='Number of workers for OpenStack API service'),
cfg.StrOpt('metadata_manager',
default='nova.api.manager.MetadataManager',
help='OpenStack metadata service manager'),
cfg.StrOpt('metadata_listen',
default="0.0.0.0",
help='IP address for metadata api to listen'),
cfg.IntOpt('metadata_listen_port',
default=8775,
help='port for metadata api to listen'),
cfg.IntOpt('metadata_workers',
default=None,
help='Number of workers for metadata service'),
cfg.StrOpt('osapi_volume_listen',
default="0.0.0.0",
help='IP address for OpenStack Volume API to listen'),
cfg.IntOpt('osapi_volume_listen_port',
default=8776,
help='port for os volume api to listen'),
cfg.IntOpt('osapi_volume_workers',
default=None,
help='Number of workers for OpenStack Volume API service'),
]
FLAGS = flags.FLAGS
FLAGS.register_opts(service_opts)
class SignalExit(SystemExit):
def __init__(self, signo, exccode=1):
super(SignalExit, self).__init__(exccode)
self.signo = signo
class Launcher(object):
"""Launch one or more services and wait for them to complete."""
def __init__(self):
"""Initialize the service launcher.
:returns: None
"""
self._services = []
eventlet_backdoor.initialize_if_enabled()
@staticmethod
def run_server(server):
"""Start and wait for a server to finish.
:param service: Server to run and wait for.
:returns: None
"""
server.start()
server.wait()
def launch_server(self, server):
"""Load and start the given server.
:param server: The server you would like to start.
:returns: None
"""
gt = eventlet.spawn(self.run_server, server)
self._services.append(gt)
def stop(self):
"""Stop all services which are currently running.
:returns: None
"""
for service in self._services:
service.kill()
def wait(self):
"""Waits until all services have been stopped, and then returns.
:returns: None
"""
for service in self._services:
try:
service.wait()
except greenlet.GreenletExit:
pass
class ServiceLauncher(Launcher):
def _handle_signal(self, signo, frame):
# Allow the process to be killed again and die from natural causes
signal.signal(signal.SIGTERM, signal.SIG_DFL)
signal.signal(signal.SIGINT, signal.SIG_DFL)
raise SignalExit(signo)
def wait(self):
signal.signal(signal.SIGTERM, self._handle_signal)
signal.signal(signal.SIGINT, self._handle_signal)
LOG.debug(_('Full set of FLAGS:'))
for flag in FLAGS:
flag_get = FLAGS.get(flag, None)
# hide flag contents from log if contains a password
# should use secret flag when switch over to openstack-common
if ("_password" in flag or "_key" in flag or
(flag == "sql_connection" and "mysql:" in flag_get)):
LOG.debug(_('%(flag)s : FLAG SET ') % locals())
else:
LOG.debug('%(flag)s : %(flag_get)s' % locals())
status = None
try:
super(ServiceLauncher, self).wait()
except SignalExit as exc:
signame = {signal.SIGTERM: 'SIGTERM',
signal.SIGINT: 'SIGINT'}[exc.signo]
LOG.info(_('Caught %s, exiting'), signame)
status = exc.code
except SystemExit as exc:
status = exc.code
finally:
self.stop()
rpc.cleanup()
if status is not None:
sys.exit(status)
class ServerWrapper(object):
def __init__(self, server, workers):
self.server = server
self.workers = workers
self.children = set()
self.forktimes = []
class ProcessLauncher(object):
def __init__(self):
self.children = {}
self.sigcaught = None
self.running = True
rfd, self.writepipe = os.pipe()
self.readpipe = eventlet.greenio.GreenPipe(rfd, 'r')
signal.signal(signal.SIGTERM, self._handle_signal)
signal.signal(signal.SIGINT, self._handle_signal)
def _handle_signal(self, signo, frame):
self.sigcaught = signo
self.running = False
# Allow the process to be killed again and die from natural causes
signal.signal(signal.SIGTERM, signal.SIG_DFL)
signal.signal(signal.SIGINT, signal.SIG_DFL)
def _pipe_watcher(self):
# This will block until the write end is closed when the parent
# dies unexpectedly
self.readpipe.read()
LOG.info(_('Parent process has died unexpectedly, exiting'))
sys.exit(1)
def _child_process(self, server):
# Setup child signal handlers differently
def _sigterm(*args):
signal.signal(signal.SIGTERM, signal.SIG_DFL)
raise SignalExit(signal.SIGTERM)
signal.signal(signal.SIGTERM, _sigterm)
# Block SIGINT and let the parent send us a SIGTERM
signal.signal(signal.SIGINT, signal.SIG_IGN)
# Reopen the eventlet hub to make sure we don't share an epoll
# fd with parent and/or siblings, which would be bad
eventlet.hubs.use_hub()
# Close write to ensure only parent has it open
os.close(self.writepipe)
# Create greenthread to watch for parent to close pipe
eventlet.spawn(self._pipe_watcher)
# Reseed random number generator
random.seed()
launcher = Launcher()
launcher.run_server(server)
def _start_child(self, wrap):
if len(wrap.forktimes) > wrap.workers:
# Limit ourselves to one process a second (over the period of
# number of workers * 1 second). This will allow workers to
# start up quickly but ensure we don't fork off children that
# die instantly too quickly.
if time.time() - wrap.forktimes[0] < wrap.workers:
LOG.info(_('Forking too fast, sleeping'))
time.sleep(1)
wrap.forktimes.pop(0)
wrap.forktimes.append(time.time())
pid = os.fork()
if pid == 0:
# NOTE(johannes): All exceptions are caught to ensure this
# doesn't fallback into the loop spawning children. It would
# be bad for a child to spawn more children.
status = 0
try:
self._child_process(wrap.server)
except SignalExit as exc:
signame = {signal.SIGTERM: 'SIGTERM',
signal.SIGINT: 'SIGINT'}[exc.signo]
LOG.info(_('Caught %s, exiting'), signame)
status = exc.code
except SystemExit as exc:
status = exc.code
except BaseException:
LOG.exception(_('Unhandled exception'))
status = 2
finally:
wrap.server.stop()
os._exit(status)
LOG.info(_('Started child %d'), pid)
wrap.children.add(pid)
self.children[pid] = wrap
return pid
def launch_server(self, server, workers=1):
wrap = ServerWrapper(server, workers)
LOG.info(_('Starting %d workers'), wrap.workers)
while self.running and len(wrap.children) < wrap.workers:
self._start_child(wrap)
def _wait_child(self):
try:
pid, status = os.wait()
except OSError as exc:
if exc.errno not in (errno.EINTR, errno.ECHILD):
raise
return None
if os.WIFSIGNALED(status):
sig = os.WTERMSIG(status)
LOG.info(_('Child %(pid)d killed by signal %(sig)d'), locals())
else:
code = os.WEXITSTATUS(status)
LOG.info(_('Child %(pid)d exited with status %(code)d'), locals())
if pid not in self.children:
LOG.warning(_('pid %d not in child list'), pid)
return None
wrap = self.children.pop(pid)
wrap.children.remove(pid)
return wrap
def wait(self):
"""Loop waiting on children to die and respawning as necessary"""
while self.running:
wrap = self._wait_child()
if not wrap:
continue
while self.running and len(wrap.children) < wrap.workers:
self._start_child(wrap)
if self.sigcaught:
signame = {signal.SIGTERM: 'SIGTERM',
signal.SIGINT: 'SIGINT'}[self.sigcaught]
LOG.info(_('Caught %s, stopping children'), signame)
for pid in self.children:
try:
os.kill(pid, signal.SIGTERM)
except OSError as exc:
if exc.errno != errno.ESRCH:
raise
# Wait for children to die
if self.children:
LOG.info(_('Waiting on %d children to exit'), len(self.children))
while self.children:
self._wait_child()
class Service(object):
"""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 and reports
it state to the database services table."""
def __init__(self, host, binary, topic, manager, report_interval=None,
periodic_interval=None, periodic_fuzzy_delay=None,
*args, **kwargs):
self.host = host
self.binary = binary
self.topic = topic
self.manager_class_name = manager
manager_class = importutils.import_class(self.manager_class_name)
self.manager = manager_class(host=self.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 = []
def start(self):
vcs_string = version.version_string_with_vcs()
LOG.audit(_('Starting %(topic)s node (version %(vcs_string)s)'),
{'topic': self.topic, 'vcs_string': vcs_string})
self.manager.init_host()
self.model_disconnected = False
ctxt = context.get_admin_context()
try:
service_ref = db.service_get_by_args(ctxt,
self.host,
self.binary)
self.service_id = service_ref['id']
except exception.NotFound:
self._create_service_ref(ctxt)
if 'nova-compute' == self.binary:
self.manager.update_available_resource(ctxt)
self.conn = rpc.create_connection(new=True)
LOG.debug(_("Creating Consumer connection for Service %s") %
self.topic)
rpc_dispatcher = self.manager.create_rpc_dispatcher()
# Share this same connection for these Consumers
self.conn.create_consumer(self.topic, rpc_dispatcher, fanout=False)
node_topic = '%s.%s' % (self.topic, self.host)
self.conn.create_consumer(node_topic, rpc_dispatcher, fanout=False)
self.conn.create_consumer(self.topic, rpc_dispatcher, fanout=True)
# Consume from all consumers in a thread
self.conn.consume_in_thread()
if self.report_interval:
pulse = utils.LoopingCall(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 = utils.LoopingCall(self.periodic_tasks)
periodic.start(interval=self.periodic_interval,
initial_delay=initial_delay)
self.timers.append(periodic)
def _create_service_ref(self, context):
zone = FLAGS.node_availability_zone
service_ref = db.service_create(context,
{'host': self.host,
'binary': self.binary,
'topic': self.topic,
'report_count': 0,
'availability_zone': zone})
self.service_id = service_ref['id']
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 FLAGS.host
:param binary: defaults to basename of executable
:param topic: defaults to bin_name - 'nova-' part
:param manager: defaults to FLAGS.<topic>_manager
:param report_interval: defaults to FLAGS.report_interval
:param periodic_interval: defaults to FLAGS.periodic_interval
:param periodic_fuzzy_delay: defaults to FLAGS.periodic_fuzzy_delay
"""
if not host:
host = FLAGS.host
if not binary:
binary = os.path.basename(inspect.stack()[-1][1])
if not topic:
topic = binary.rpartition('nova-')[2]
if not manager:
manager = FLAGS.get('%s_manager' % topic, None)
if report_interval is None:
report_interval = FLAGS.report_interval
if periodic_interval is None:
periodic_interval = FLAGS.periodic_interval
if periodic_fuzzy_delay is None:
periodic_fuzzy_delay = FLAGS.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 in the datastore."""
self.stop()
try:
db.service_destroy(context.get_admin_context(), self.service_id)
except exception.NotFound:
LOG.warn(_('Service killed that has no database entry'))
def stop(self):
# Try to shut the connection down, but if we get any sort of
# errors, go ahead and ignore them.. as we're shutting down anyway
try:
self.conn.close()
except Exception:
pass
for x in self.timers:
try:
x.stop()
except Exception:
pass
self.timers = []
def wait(self):
for x in self.timers:
try:
x.wait()
except Exception:
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 in the datastore."""
ctxt = context.get_admin_context()
zone = FLAGS.node_availability_zone
state_catalog = {}
try:
try:
service_ref = db.service_get(ctxt, self.service_id)
except exception.NotFound:
LOG.debug(_('The service database object disappeared, '
'Recreating it.'))
self._create_service_ref(ctxt)
service_ref = db.service_get(ctxt, self.service_id)
state_catalog['report_count'] = service_ref['report_count'] + 1
if zone != service_ref['availability_zone']:
state_catalog['availability_zone'] = zone
db.service_update(ctxt,
self.service_id, state_catalog)
# TODO(termie): make this pattern be more elegant.
if getattr(self, 'model_disconnected', False):
self.model_disconnected = False
LOG.error(_('Recovered model server connection!'))
# TODO(vish): this should probably only catch connection errors
except Exception: # pylint: disable=W0702
if not getattr(self, 'model_disconnected', False):
self.model_disconnected = True
LOG.exception(_('model server went away'))
class WSGIService(object):
"""Provides ability to launch API from a 'paste' configuration."""
def __init__(self, name, loader=None):
"""Initialize, but do not start the WSGI server.
:param name: The name of the WSGI server given to the loader.
:param loader: Loads the WSGI application using the given name.
:returns: None
"""
self.name = name
self.manager = self._get_manager()
self.loader = loader or wsgi.Loader()
self.app = self.loader.load_app(name)
self.host = getattr(FLAGS, '%s_listen' % name, "0.0.0.0")
self.port = getattr(FLAGS, '%s_listen_port' % name, 0)
self.workers = getattr(FLAGS, '%s_workers' % name, None)
self.server = wsgi.Server(name,
self.app,
host=self.host,
port=self.port)
# Pull back actual port used
self.port = self.server.port
def _get_manager(self):
"""Initialize a Manager object appropriate for this service.
Use the service name to look up a Manager subclass from the
configuration and initialize an instance. If no class name
is configured, just return None.
:returns: a Manager instance, or None.
"""
fl = '%s_manager' % self.name
if not fl in FLAGS:
return None
manager_class_name = FLAGS.get(fl, None)
if not manager_class_name:
return None
manager_class = importutils.import_class(manager_class_name)
return manager_class()
def start(self):
"""Start serving this service using loaded configuration.
Also, retrieve updated port number in case '0' was passed in, which
indicates a random port should be used.
:returns: None
"""
if self.manager:
self.manager.init_host()
self.server.start()
def stop(self):
"""Stop serving this API.
:returns: None
"""
self.server.stop()
def wait(self):
"""Wait for the service to stop serving this API.
:returns: None
"""
self.server.wait()
# NOTE(vish): the global launcher is to maintain the existing
# functionality of calling service.serve +
# service.wait
_launcher = None
def serve(server, workers=None):
global _launcher
if _launcher:
raise RuntimeError(_('serve() can only be called once'))
if workers:
_launcher = ProcessLauncher()
_launcher.launch_server(server, workers=workers)
else:
_launcher = ServiceLauncher()
_launcher.launch_server(server)
def wait():
_launcher.wait()