202 lines
6.9 KiB
Python
202 lines
6.9 KiB
Python
# 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 time
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import eventlet
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from oslo_config import cfg
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from oslo_context import context as oslo_context
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from oslo_log import log as logging
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from oslo_service import threadgroup
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from osprofiler import profiler
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from senlin.common import context
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from senlin.engine.actions import base as action_mod
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from senlin.objects import action as ao
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LOG = logging.getLogger(__name__)
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wallclock = time.time
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class ThreadGroupManager(object):
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"""Thread group manager."""
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def __init__(self):
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super(ThreadGroupManager, self).__init__()
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self.group = threadgroup.ThreadGroup(
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thread_pool_size=cfg.CONF.scheduler_thread_pool_size)
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# Create dummy service task, because when there is nothing queued
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# on self.tg the process exits
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self.add_timer(cfg.CONF.periodic_interval, self._service_task)
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# TODO(Yanyan Hu): Build a DB session with full privilege
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# for DB accessing in scheduler module
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self.db_session = context.RequestContext(is_admin=True)
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def _service_task(self):
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"""Dummy task which gets queued on the service.Service threadgroup.
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Without this service.Service sees nothing running i.e has nothing to
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wait() on, so the process exits..
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This could also be used to trigger periodic non-cluster-specific
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housekeeping tasks
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(Yanyan)Not sure this is still necessary, just keep it temporarily.
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"""
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# TODO(Yanyan): have this task call dbapi purge events
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pass
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def _serialize_profile_info(self):
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prof = profiler.get()
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trace_info = None
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if prof:
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trace_info = {
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"hmac_key": prof.hmac_key,
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"base_id": prof.get_base_id(),
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"parent_id": prof.get_id()
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}
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return trace_info
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def _start_with_trace(self, cnxt, trace, func, *args, **kwargs):
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if trace:
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profiler.init(**trace)
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if cnxt is not None:
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cnxt.update_store()
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return func(*args, **kwargs)
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def start(self, func, *args, **kwargs):
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"""Run the given method in a thread."""
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req_cnxt = oslo_context.get_current()
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self.group.add_thread(
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self._start_with_trace, req_cnxt,
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self._serialize_profile_info(),
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func, *args, **kwargs)
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def start_action(self, worker_id, action_id=None):
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"""Run action(s) in sub-thread(s).
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:param worker_id: ID of the worker thread; we fake workers using
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senlin engines at the moment.
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:param action_id: ID of the action to be executed. None means all
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ready actions will be acquired and scheduled to run.
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"""
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actions_launched = 0
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max_batch_size = cfg.CONF.max_actions_per_batch
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batch_interval = cfg.CONF.batch_interval
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if action_id is not None:
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timestamp = wallclock()
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action = ao.Action.acquire(self.db_session, action_id, worker_id,
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timestamp)
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if action:
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self.start(action_mod.ActionProc, self.db_session, action.id)
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actions_launched += 1
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while True:
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timestamp = wallclock()
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action = ao.Action.acquire_first_ready(self.db_session, worker_id,
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timestamp)
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if not action:
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break
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if max_batch_size == 0 or 'NODE' not in action.action:
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self.start(action_mod.ActionProc, self.db_session, action.id)
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continue
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if max_batch_size > actions_launched:
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self.start(action_mod.ActionProc, self.db_session, action.id)
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actions_launched += 1
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continue
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self.start(action_mod.ActionProc, self.db_session, action.id)
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LOG.debug(
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'Engine %(id)s has launched %(num)s node actions '
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'consecutively, stop scheduling node action for '
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'%(interval)s second...',
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{
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'id': worker_id,
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'num': max_batch_size,
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'interval': batch_interval
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})
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sleep(batch_interval)
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actions_launched = 1
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def cancel_action(self, action_id):
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"""Cancel an action execution progress."""
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action = action_mod.Action.load(self.db_session, action_id,
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project_safe=False)
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action.signal(action.SIG_CANCEL)
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def suspend_action(self, action_id):
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"""Suspend an action execution progress."""
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action = action_mod.Action.load(self.db_session, action_id,
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project_safe=False)
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action.signal(action.SIG_SUSPEND)
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def resume_action(self, action_id):
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"""Resume an action execution progress."""
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action = action_mod.Action.load(self.db_session, action_id,
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project_safe=False)
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action.signal(action.SIG_RESUME)
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def add_timer(self, interval, func, *args, **kwargs):
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"""Define a periodic task to be run in the thread group.
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The task will be executed in a separate green thread.
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Interval is from cfg.CONF.periodic_interval
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"""
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timer = self.group.add_timer(interval, func, None, *args, **kwargs)
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return timer
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def stop_timers(self):
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self.group.stop_timers()
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def stop(self, graceful=False):
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"""Stop any active threads belong to this threadgroup."""
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# Try to stop all threads gracefully
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self.group.stop(graceful)
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self.group.wait()
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# Wait for link()ed functions (i.e. lock release)
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threads = self.group.threads[:]
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links_done = dict((th, False) for th in threads)
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def mark_done(gt, th):
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links_done[th] = True
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for th in threads:
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th.link(mark_done, th)
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while not all(links_done.values()):
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eventlet.sleep()
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def reschedule(action_id, sleep_time=1):
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"""Eventlet Sleep for the specified number of seconds.
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:param action_id: the action to put into sleep.
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:param sleep_time: seconds to sleep; if None, no sleep;
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"""
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if sleep_time is not None:
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LOG.debug('Action %s sleep for %s seconds', action_id, sleep_time)
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eventlet.sleep(sleep_time)
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def sleep(sleep_time):
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"""Interface for sleeping."""
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eventlet.sleep(sleep_time)
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