This document describes the current stable version of Celery (5.2). For development docs, go here.

Source code for celery.worker.pidbox

"""Worker Pidbox (remote control)."""
import socket
import threading

from kombu.common import ignore_errors
from kombu.utils.encoding import safe_str

from celery.utils.collections import AttributeDict
from celery.utils.functional import pass1
from celery.utils.log import get_logger

from . import control

__all__ = ('Pidbox', 'gPidbox')

logger = get_logger(__name__)
debug, error, info = logger.debug, logger.error,

[docs]class Pidbox: """Worker mailbox.""" consumer = None def __init__(self, c): self.c = c self.hostname = c.hostname self.node = safe_str(c.hostname),, state=AttributeDict(, hostname=c.hostname, consumer=c, tset=pass1 if c.controller.use_eventloop else set), ) self._forward_clock =
[docs] def on_message(self, body, message): # just increase clock as clients usually don't # have a valid clock to adjust with. self._forward_clock() try: self.node.handle_message(body, message) except KeyError as exc: error('No such control command: %s', exc) except Exception as exc: error('Control command error: %r', exc, exc_info=True) self.reset()
[docs] def start(self, c): = self.consumer = self.node.listen(callback=self.on_message) self.consumer.on_decode_error = c.on_decode_error
[docs] def on_stop(self): pass
[docs] def stop(self, c): self.on_stop() self.consumer = self._close_channel(c)
[docs] def reset(self): self.stop(self.c) self.start(self.c)
def _close_channel(self, c): if self.node and ignore_errors(c,
[docs] def shutdown(self, c): self.on_stop() if self.consumer: debug('Canceling broadcast consumer...') ignore_errors(c, self.consumer.cancel) self.stop(self.c)
[docs]class gPidbox(Pidbox): """Worker pidbox (greenlet).""" _node_shutdown = None _node_stopped = None _resets = 0
[docs] def start(self, c): c.pool.spawn_n(self.loop, c)
[docs] def on_stop(self): if self._node_stopped: self._node_shutdown.set() debug('Waiting for broadcast thread to shutdown...') self._node_stopped.wait() self._node_stopped = self._node_shutdown = None
[docs] def reset(self): self._resets += 1
def _do_reset(self, c, connection): self._close_channel(c) = self.consumer = self.node.listen(callback=self.on_message) self.consumer.consume()
[docs] def loop(self, c): resets = [self._resets] shutdown = self._node_shutdown = threading.Event() stopped = self._node_stopped = threading.Event() try: with c.connection_for_read() as connection: info('pidbox: Connected to %s.', connection.as_uri()) self._do_reset(c, connection) while not shutdown.is_set() and c.connection: if resets[0] < self._resets: resets[0] += 1 self._do_reset(c, connection) try: connection.drain_events(timeout=1.0) except socket.timeout: pass finally: stopped.set()