Esempio n. 1
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    def wait(self):
        """Loop waiting on children to die and respawning as necessary."""

        systemd.notify_once()
        LOG.debug('Full set of CONF:')
        CONF.log_opt_values(LOG, logging.DEBUG)

        try:
            while True:
                self.handle_signal()
                self._respawn_children()
                # No signal means that stop was called.  Don't clean up here.
                if not self.sigcaught:
                    return

                signame = _signo_to_signame(self.sigcaught)
                LOG.info(_LI('Caught %s, stopping children'), signame)
                if not _is_sighup_and_daemon(self.sigcaught):
                    break

                cfg.CONF.reload_config_files()
                for service in set(
                        [wrap.service for wrap in self.children.values()]):
                    service.reset()

                for pid in self.children:
                    os.kill(pid, signal.SIGHUP)

                self.running = True
                self.sigcaught = None
        except eventlet.greenlet.GreenletExit:
            LOG.info(_LI("Wait called after thread killed. Cleaning up."))

        self.stop()
Esempio n. 2
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    def _add_periodic_task(cls, task):
        """Add a periodic task to the list of periodic tasks.

        The task should already be decorated by @periodic_task.

        :return: whether task was actually enabled
        """
        name = task._periodic_name

        if task._periodic_spacing < 0:
            LOG.info(
                _LI('Skipping periodic task %(task)s because '
                    'its interval is negative'), {'task': name})
            return False
        if not task._periodic_enabled:
            LOG.info(
                _LI('Skipping periodic task %(task)s because '
                    'it is disabled'), {'task': name})
            return False

        # A periodic spacing of zero indicates that this task should
        # be run on the default interval to avoid running too
        # frequently.
        if task._periodic_spacing == 0:
            task._periodic_spacing = DEFAULT_INTERVAL

        cls._periodic_tasks.append((name, task))
        cls._periodic_spacing[name] = task._periodic_spacing
        return True
Esempio n. 3
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    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(_LI('Forking too fast, sleeping'))
                time.sleep(1)

            wrap.forktimes.pop(0)

        wrap.forktimes.append(time.time())

        pid = os.fork()
        if pid == 0:
            launcher = self._child_process(wrap.service)
            while True:
                self._child_process_handle_signal()
                status, signo = self._child_wait_for_exit_or_signal(launcher)
                if not _is_sighup_and_daemon(signo):
                    break
                launcher.restart()

            os._exit(status)

        LOG.info(_LI('Started child %d'), pid)

        wrap.children.add(pid)
        self.children[pid] = wrap

        return pid
Esempio n. 4
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    def _wait_child(self):
        try:
            # Don't block if no child processes have exited
            pid, status = os.waitpid(0, os.WNOHANG)
            if not pid:
                return None
        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(_LI('Child %(pid)d killed by signal %(sig)d'),
                     dict(pid=pid, sig=sig))
        else:
            code = os.WEXITSTATUS(status)
            LOG.info(_LI('Child %(pid)s exited with status %(code)d'),
                     dict(pid=pid, code=code))

        if pid not in self.children:
            LOG.warning(_LW('pid %d not in child list'), pid)
            return None

        wrap = self.children.pop(pid)
        wrap.children.remove(pid)
        return wrap
Esempio n. 5
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    def _add_periodic_task(cls, task):
        """Add a periodic task to the list of periodic tasks.

        The task should already be decorated by @periodic_task.

        :return: whether task was actually enabled
        """
        name = task._periodic_name

        if task._periodic_spacing < 0:
            LOG.info(_LI('Skipping periodic task %(task)s because '
                         'its interval is negative'),
                     {'task': name})
            return False
        if not task._periodic_enabled:
            LOG.info(_LI('Skipping periodic task %(task)s because '
                         'it is disabled'),
                     {'task': name})
            return False

        # A periodic spacing of zero indicates that this task should
        # be run on the default interval to avoid running too
        # frequently.
        if task._periodic_spacing == 0:
            task._periodic_spacing = DEFAULT_INTERVAL

        cls._periodic_tasks.append((name, task))
        cls._periodic_spacing[name] = task._periodic_spacing
        return True
Esempio n. 6
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    def _pipe_watcher(self):
        # This will block until the write end is closed when the parent
        # dies unexpectedly
        self.readpipe.read()

        LOG.info(_LI('Parent process has died unexpectedly, exiting'))

        sys.exit(1)
Esempio n. 7
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    def stop(self):
        """Terminate child processes and wait on each."""
        self.running = False
        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(_LI('Waiting on %d children to exit'), len(self.children))
            while self.children:
                self._wait_child()
Esempio n. 8
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def initialize_if_enabled():
    backdoor_locals = {
        'exit': _dont_use_this,  # So we don't exit the entire process
        'quit': _dont_use_this,  # So we don't exit the entire process
        'fo': _find_objects,
        'pgt': _print_greenthreads,
        'pnt': _print_nativethreads,
    }

    if CONF.backdoor_port is None:
        return None

    start_port, end_port = _parse_port_range(str(CONF.backdoor_port))

    # NOTE(johannes): The standard sys.displayhook will print the value of
    # the last expression and set it to __builtin__._, which overwrites
    # the __builtin__._ that gettext sets. Let's switch to using pprint
    # since it won't interact poorly with gettext, and it's easier to
    # read the output too.
    def displayhook(val):
        if val is not None:
            pprint.pprint(val)

    sys.displayhook = displayhook

    sock = _listen('localhost', start_port, end_port, eventlet.listen)

    # In the case of backdoor port being zero, a port number is assigned by
    # listen().  In any case, pull the port number out here.
    port = sock.getsockname()[1]
    LOG.info(
        _LI('Eventlet backdoor listening on %(port)s for process %(pid)d') % {
            'port': port,
            'pid': os.getpid()
        })
    eventlet.spawn_n(eventlet.backdoor.backdoor_server,
                     sock,
                     locals=backdoor_locals)
    return port
Esempio n. 9
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    def _wait_for_exit_or_signal(self, ready_callback=None):
        status = None
        signo = 0

        LOG.debug('Full set of CONF:')
        CONF.log_opt_values(LOG, logging.DEBUG)

        try:
            if ready_callback:
                ready_callback()
            super(ServiceLauncher, self).wait()
        except SignalExit as exc:
            signame = _signo_to_signame(exc.signo)
            LOG.info(_LI('Caught %s, exiting'), signame)
            status = exc.code
            signo = exc.signo
        except SystemExit as exc:
            status = exc.code
        finally:
            self.stop()

        return status, signo
Esempio n. 10
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    def _child_wait_for_exit_or_signal(self, launcher):
        status = 0
        signo = 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.
        try:
            launcher.wait()
        except SignalExit as exc:
            signame = _signo_to_signame(exc.signo)
            LOG.info(_LI('Child caught %s, exiting'), signame)
            status = exc.code
            signo = exc.signo
        except SystemExit as exc:
            status = exc.code
        except BaseException:
            LOG.exception(_LE('Unhandled exception'))
            status = 2
        finally:
            launcher.stop()

        return status, signo
Esempio n. 11
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    def launch_service(self, service, workers=1):
        wrap = ServiceWrapper(service, workers)

        LOG.info(_LI('Starting %d workers'), wrap.workers)
        while self.running and len(wrap.children) < wrap.workers:
            self._start_child(wrap)