# 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._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()