107 lines
3.5 KiB
Python
107 lines
3.5 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 os
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import signal
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import time
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from oslo_service import service as oslo_service
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from gbpservice.nfp.core import log as nfp_logging
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LOG = nfp_logging.getLogger(__name__)
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ProcessLauncher = oslo_service.ProcessLauncher
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"""Worker process launcher.
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Derives the oslo process launcher to
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launch childrens with python multiprocessing
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as oppose to os.fork(), coz, communication
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is needed from parent->child not just the
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parallel execution.
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"""
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class NfpLauncher(ProcessLauncher):
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def __init__(self, conf):
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# Add SIGALARM to ignore_signals, because core
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# uses SIGALRM for watchdog, while oslo uses the
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# same for exit.
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# Signal handler is singleton class, changing here will
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# have global effect.
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self.signal_handler = oslo_service.SignalHandler()
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self.signal_handler._ignore_signals += ('SIGALRM',)
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self.signal_handler._signals_by_name = dict(
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(name, getattr(signal, name))
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for name in dir(signal)
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if name.startswith("SIG") and
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name not in self.signal_handler._ignore_signals)
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super(NfpLauncher, self).__init__(conf)
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def child(self, service, ppipe, cpipe, controller):
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service.parent_pipe = ppipe
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service.pipe = cpipe
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service.controller = controller
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self.launcher = self._child_process(service)
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while True:
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self._child_process_handle_signal()
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status, signo = self._child_wait_for_exit_or_signal(
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self.launcher)
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if not oslo_service._is_sighup_and_daemon(signo):
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self.launcher.wait()
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break
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self.launcher.restart()
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os._exit(status)
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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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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 = self.fork_child(wrap)
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message = "Started Child Process %d" % (pid)
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LOG.debug(message)
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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 fork_child(self, wrap):
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# Default use os.fork to create a child
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pid = os.fork()
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if pid == 0:
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self.launcher = self._child_process(wrap.service)
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while True:
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self._child_process_handle_signal()
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status, signo = self._child_wait_for_exit_or_signal(
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self.launcher)
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if not oslo_service._is_sighup_and_daemon(signo):
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self.launcher.wait()
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break
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self.launcher.restart()
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os._exit(status)
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return pid
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