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(_('Child %(pid)d killed by signal %(sig)d'), dict(pid=pid, sig=sig)) else: code = os.WEXITSTATUS(status) LOG.info(_('Child %(pid)s exited with status %(code)d'), dict(pid=pid, code=code)) 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.""" LOG.debug(_('Full set of CONF:')) CONF.log_opt_values(LOG, std_logging.DEBUG) while True: self.handle_signal() self._respawn_children() if self.sigcaught: signame = _signo_to_signame(self.sigcaught) LOG.info(_('Caught %s, stopping children'), signame) if not _is_sighup(self.sigcaught): break for pid in self.children: os.kill(pid, signal.SIGHUP) self.running = True self.sigcaught = None 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()
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. 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(signo): break launcher.restart() os._exit(status) LOG.info(_('Started child %d'), pid) wrap.children.add(pid) self.children[pid] = wrap return pid
def _wait_for_exit_or_signal(self): status = None signo = 0 LOG.debug(_('Full set of CONF:')) CONF.log_opt_values(LOG, std_logging.DEBUG) try: super(ServiceLauncher, self).wait() except SignalExit as exc: signame = _signo_to_signame(exc.signo) LOG.info(_('Caught %s, exiting'), signame) status = exc.code signo = exc.signo except SystemExit as exc: status = exc.code finally: self.stop() if rpc: try: rpc.cleanup() except Exception: # We're shutting down, so it doesn't matter at this point. LOG.exception(_('Exception during rpc cleanup.')) return status, signo
def _inner(): if initial_delay: greenthread.sleep(initial_delay) try: while self._running: start = timeutils.utcnow() self.f(*self.args, **self.kw) end = timeutils.utcnow() if not self._running: break delay = interval - timeutils.delta_seconds(start, end) if delay <= 0: LOG.warn(_('task run outlasted interval by %s sec') % -delay) greenthread.sleep(delay if delay > 0 else 0) except LoopingCallDone as e: self.stop() done.send(e.retvalue) except Exception: LOG.exception(_('in fixed duration looping call')) done.send_exception(*sys.exc_info()) return else: done.send(True)
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(_("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
def deprecated(self, msg, *args, **kwargs): stdmsg = _("Deprecated: %s") % msg if CONF.fatal_deprecations: self.critical(stdmsg, *args, **kwargs) raise DeprecatedConfig(msg=stdmsg) else: self.warn(stdmsg, *args, **kwargs)
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_wait_for_exit_or_signal(self, launcher): status = None signo = 0 try: launcher.wait() except SignalExit as exc: signame = _signo_to_signame(exc.signo) LOG.info(_('Caught %s, exiting'), signame) status = exc.code signo = exc.signo except SystemExit as exc: status = exc.code except BaseException: LOG.exception(_('Unhandled exception')) status = 2 finally: launcher.stop() return status, signo
def _inner(): if initial_delay: greenthread.sleep(initial_delay) try: while self._running: idle = self.f(*self.args, **self.kw) if not self._running: break if periodic_interval_max is not None: idle = min(idle, periodic_interval_max) LOG.debug(_('Dynamic looping call sleeping for %.02f ' 'seconds'), idle) greenthread.sleep(idle) except LoopingCallDone as e: self.stop() done.send(e.retvalue) except Exception: LOG.exception(_('in dynamic looping call')) done.send_exception(*sys.exc_info()) return else: done.send(True)
def _find_facility_from_conf(): facility_names = logging.handlers.SysLogHandler.facility_names facility = getattr(logging.handlers.SysLogHandler, CONF.syslog_log_facility, None) if facility is None and CONF.syslog_log_facility in facility_names: facility = facility_names.get(CONF.syslog_log_facility) if facility is None: valid_facilities = facility_names.keys() consts = ['LOG_AUTH', 'LOG_AUTHPRIV', 'LOG_CRON', 'LOG_DAEMON', 'LOG_FTP', 'LOG_KERN', 'LOG_LPR', 'LOG_MAIL', 'LOG_NEWS', 'LOG_AUTH', 'LOG_SYSLOG', 'LOG_USER', 'LOG_UUCP', 'LOG_LOCAL0', 'LOG_LOCAL1', 'LOG_LOCAL2', 'LOG_LOCAL3', 'LOG_LOCAL4', 'LOG_LOCAL5', 'LOG_LOCAL6', 'LOG_LOCAL7'] valid_facilities.extend(consts) raise TypeError(_('syslog facility must be one of: %s') % ', '.join("'%s'" % fac for fac in valid_facilities)) return facility
def launch_service(self, service, workers=1): wrap = ServiceWrapper(service, workers) LOG.info(_('Starting %d workers'), wrap.workers) while self.running and len(wrap.children) < wrap.workers: self._start_child(wrap)