class Polaroid(object):
shutter_signal = Signal(providing_args=("state", ))
cleanup_signal = Signal()
clear_after = False
_tref = None
def __init__(self, state, freq=1.0, maxrate=None,
cleanup_freq=3600.0, logger=None):
self.state = state
self.freq = freq
self.cleanup_freq = cleanup_freq
self.logger = logger or log.get_default_logger(name="celery.cam")
self.maxrate = maxrate and TokenBucket(rate(maxrate))
def install(self):
self._tref = timer2.apply_interval(self.freq * 1000.0,
self.capture)
self._ctref = timer2.apply_interval(self.cleanup_freq * 1000.0,
self.cleanup)
def on_shutter(self, state):
pass
def on_cleanup(self):
pass
def cleanup(self):
self.debug("Cleanup: Running...")
self.cleanup_signal.send(None)
self.on_cleanup()
def debug(self, msg):
if self.logger:
self.logger.debug(msg)
def shutter(self):
if self.maxrate is None or self.maxrate.can_consume():
self.debug("Shutter: %s" % (self.state, ))
self.shutter_signal.send(self.state)
self.on_shutter(self.state)
def capture(self):
self.state.freeze_while(self.shutter, clear_after=self.clear_after)
def cancel(self):
if self._tref:
self._tref()
self._tref.cancel()
if self._ctref:
self._ctref.cancel()
def __enter__(self):
self.install()
return self
def __exit__(self, *exc_info):
self.cancel()
class Polaroid(object):
timer = timer2
shutter_signal = Signal(providing_args=('state', ))
cleanup_signal = Signal()
clear_after = False
_tref = None
_ctref = None
def __init__(self, state, freq=1.0, maxrate=None,
cleanup_freq=3600.0, timer=None, app=None):
self.app = app_or_default(app)
self.state = state
self.freq = freq
self.cleanup_freq = cleanup_freq
self.timer = timer or self.timer
self.logger = logger
self.maxrate = maxrate and TokenBucket(rate(maxrate))
def install(self):
self._tref = self.timer.apply_interval(self.freq * 1000.0,
self.capture)
self._ctref = self.timer.apply_interval(self.cleanup_freq * 1000.0,
self.cleanup)
def on_shutter(self, state):
pass
def on_cleanup(self):
pass
def cleanup(self):
logger.debug('Cleanup: Running...')
self.cleanup_signal.send(None)
self.on_cleanup()
def shutter(self):
if self.maxrate is None or self.maxrate.can_consume():
logger.debug('Shutter: %s', self.state)
self.shutter_signal.send(self.state)
self.on_shutter(self.state)
def capture(self):
self.state.freeze_while(self.shutter, clear_after=self.clear_after)
def cancel(self):
if self._tref:
self._tref() # flush all received events.
self._tref.cancel()
if self._ctref:
self._ctref.cancel()
def __enter__(self):
self.install()
return self
def __exit__(self, *exc_info):
self.cancel()
def start_worker(
app,
concurrency=1,
pool='solo',
loglevel=log_level, #
logfile=None,
**kwargs):
from celery.utils.dispatch import Signal
test_worker_starting = Signal(
name='test_worker_starting',
providing_args={},
)
test_worker_stopped = Signal(
name='test_worker_stopped',
providing_args={'worker'},
)
test_worker_starting.send(sender=app)
with _start_worker_thread(app,
concurrency=concurrency,
pool=pool,
loglevel=loglevel,
logfile=logfile,
**kwargs) as worker:
yield worker
test_worker_stopped.send(sender=app, worker=worker)
class Camera(object):
clear_after = False
_tref = None
shutter_signal = Signal(providing_args=('state', ))
def __init__(self, state, config):
self.state = state
self.timer = Timer()
self.freq = config.getfloat('camera', 'frequency')
def install(self):
self._tref = self.timer.call_repeatedly(self.freq, self.capture)
def on_shutter(self, monitor):
pass
def after_shutter(self):
pass
def capture(self):
self.state.freeze_while(self.shutter, clear_after=self.clear_after)
self.after_shutter()
def shutter(self):
self.shutter_signal.send(self.state)
self.on_shutter(self.state)
def cancel(self):
if self._tref:
self._tref() # flush all received events.
self._tref.cancel()
def __enter__(self):
self.install()
return self
def __exit__(self, *exc_info):
self.cancel()
return True
from celery.utils.dispatch import Signal
task_sent = Signal(
providing_args=["task_id", "task", "args", "kwargs", "eta", "taskset"])
task_prerun = Signal(providing_args=["task_id", "task", "args", "kwargs"])
task_postrun = Signal(
providing_args=["task_id", "task", "args", "kwargs", "retval"])
worker_init = Signal(providing_args=[])
worker_process_init = Signal(providing_args=[])
worker_ready = Signal(providing_args=[])
worker_shutdown = Signal(providing_args=[])
"""cyme.branch.signals""" from __future__ import absolute_import from celery.utils.dispatch import Signal #: Sent when the http server is ready to accept requests. #: Arguments: #: #: :sender: the :class:`~cyme.httpd.HttpServer` instance. #: :addrport: the ``(hostname, port)`` tuple. #: :handler: the WSGI handler used. #: :sock: the socket used. httpd_ready = Signal(providing_args=['addrport', 'handler', 'sock']) #: Sent when the supervisor is ready. #: Arguments: #: #: :sender: is the :class:`~cyme.supervisor.Supervisor` instance. supervisor_ready = Signal() #: Sent when a controller is ready. #: #: Arguments: #: :sender: is the :class:`~cyme.controller.Controller` instance. controller_ready = Signal() #: Sent when the branch and all its components are ready to serve. #: #: Arguments: #: :sender: is the :class:`~cyme.branch.Branch` instance.
def __init__(self,
main=None,
loader=None,
backend=None,
amqp=None,
events=None,
log=None,
control=None,
set_as_current=True,
tasks=None,
broker=None,
include=None,
changes=None,
config_source=None,
fixups=None,
task_cls=None,
autofinalize=True,
namespace=None,
strict_typing=True,
**kwargs):
self.clock = LamportClock()
self.main = main
self.amqp_cls = amqp or self.amqp_cls
self.events_cls = events or self.events_cls
self.loader_cls = loader or self._get_default_loader()
self.log_cls = log or self.log_cls
self.control_cls = control or self.control_cls
self.task_cls = task_cls or self.task_cls
self.set_as_current = set_as_current
self.registry_cls = symbol_by_name(self.registry_cls)
self.user_options = defaultdict(set)
self.steps = defaultdict(set)
self.autofinalize = autofinalize
self.namespace = namespace
self.strict_typing = strict_typing
self.configured = False
self._config_source = config_source
self._pending_defaults = deque()
self._pending_periodic_tasks = deque()
self.finalized = False
self._finalize_mutex = threading.Lock()
self._pending = deque()
self._tasks = tasks
if not isinstance(self._tasks, TaskRegistry):
self._tasks = self.registry_cls(self._tasks or {})
# If the class defines a custom __reduce_args__ we need to use
# the old way of pickling apps: pickling a list of
# args instead of the new way that pickles a dict of keywords.
self._using_v1_reduce = app_has_custom(self, '__reduce_args__')
# these options are moved to the config to
# simplify pickling of the app object.
self._preconf = changes or {}
self._preconf_set_by_auto = set()
self.__autoset('broker_url', broker)
self.__autoset('result_backend', backend)
self.__autoset('include', include)
self._conf = Settings(
PendingConfiguration(self._preconf, self._finalize_pending_conf),
prefix=self.namespace,
keys=(_old_key_to_new, _new_key_to_old),
)
# - Apply fix-ups.
self.fixups = set(self.builtin_fixups) if fixups is None else fixups
# ...store fixup instances in _fixups to keep weakrefs alive.
self._fixups = [symbol_by_name(fixup)(self) for fixup in self.fixups]
if self.set_as_current:
self.set_current()
# Signals
if self.on_configure is None:
# used to be a method pre 4.0
self.on_configure = Signal(name='app.on_configure')
self.on_after_configure = Signal(
name='app.on_after_configure',
providing_args={'source'},
)
self.on_after_finalize = Signal(name='app.on_after_finalize')
self.on_after_fork = Signal(name='app.on_after_fork')
self.on_init()
_register_app(self)
def __init__(self, main=None, loader=None, backend=None,
amqp=None, events=None, log=None, control=None,
set_as_current=True, tasks=None, broker=None, include=None,
changes=None, config_source=None, fixups=None, task_cls=None,
autofinalize=True, namespace=None, **kwargs):
self.clock = LamportClock()
self.main = main
self.amqp_cls = amqp or self.amqp_cls
self.events_cls = events or self.events_cls
self.loader_cls = loader or self.loader_cls
self.log_cls = log or self.log_cls
self.control_cls = control or self.control_cls
self.task_cls = task_cls or self.task_cls
self.set_as_current = set_as_current
self.registry_cls = symbol_by_name(self.registry_cls)
self.user_options = defaultdict(set)
self.steps = defaultdict(set)
self.autofinalize = autofinalize
self.namespace = namespace
self.configured = False
self._config_source = config_source
self._pending_defaults = deque()
self._pending_periodic_tasks = deque()
self.finalized = False
self._finalize_mutex = threading.Lock()
self._pending = deque()
self._tasks = tasks
if not isinstance(self._tasks, TaskRegistry):
self._tasks = TaskRegistry(self._tasks or {})
# If the class defines a custom __reduce_args__ we need to use
# the old way of pickling apps, which is pickling a list of
# args instead of the new way that pickles a dict of keywords.
self._using_v1_reduce = app_has_custom(self, '__reduce_args__')
# these options are moved to the config to
# simplify pickling of the app object.
self._preconf = changes or {}
self._preconf_set_by_auto = set()
self.__autoset('broker_url', broker)
self.__autoset('result_backend', backend)
self.__autoset('include', include)
self._conf = Settings(
PendingConfiguration(
self._preconf, self._get_from_conf_and_finalize),
prefix=self.namespace,
)
# - Apply fix-ups.
self.fixups = set(self.builtin_fixups) if fixups is None else fixups
# ...store fixup instances in _fixups to keep weakrefs alive.
self._fixups = [symbol_by_name(fixup)(self) for fixup in self.fixups]
if self.set_as_current:
self.set_current()
# Signals
if self.on_configure is None:
# used to be a method pre 4.0
self.on_configure = Signal()
self.on_after_configure = Signal()
self.on_after_finalize = Signal()
self.on_after_fork = Signal()
self.on_init()
_register_app(self)
gc.collect()
def receiver_1_arg(val, **kwargs):
return val
class Callable(object):
def __call__(self, val, **kwargs):
return val
def a(self, val, **kwargs):
return val
a_signal = Signal(providing_args=['val'])
class DispatcherTests(Case):
"""Test suite for dispatcher (barely started)"""
def _testIsClean(self, signal):
"""Assert that everything has been cleaned up automatically"""
self.assertEqual(signal.receivers, [])
# force cleanup just in case
signal.receivers = []
def testExact(self):
a_signal.connect(receiver_1_arg, sender=self)
expected = [(receiver_1_arg, 'test')]
result = a_signal.send(sender=self, val='test')
class Celery(object):
#: This is deprecated, use :meth:`reduce_keys` instead
Pickler = AppPickler
SYSTEM = platforms.SYSTEM
IS_OSX, IS_WINDOWS = platforms.IS_OSX, platforms.IS_WINDOWS
amqp_cls = 'celery.app.amqp:AMQP'
backend_cls = None
events_cls = 'celery.events:Events'
loader_cls = 'celery.loaders.app:AppLoader'
log_cls = 'celery.app.log:Logging'
control_cls = 'celery.app.control:Control'
task_cls = 'celery.app.task:Task'
registry_cls = TaskRegistry
_fixups = None
_pool = None
_conf = None
builtin_fixups = BUILTIN_FIXUPS
#: Signal sent when app is loading configuration.
on_configure = None
#: Signal sent after app has prepared the configuration.
on_after_configure = None
#: Signal sent after app has been finalized.
on_after_finalize = None
#: ignored
accept_magic_kwargs = False
def __init__(self, main=None, loader=None, backend=None,
amqp=None, events=None, log=None, control=None,
set_as_current=True, tasks=None, broker=None, include=None,
changes=None, config_source=None, fixups=None, task_cls=None,
autofinalize=True, **kwargs):
self.clock = LamportClock()
self.main = main
self.amqp_cls = amqp or self.amqp_cls
self.events_cls = events or self.events_cls
self.loader_cls = loader or self.loader_cls
self.log_cls = log or self.log_cls
self.control_cls = control or self.control_cls
self.task_cls = task_cls or self.task_cls
self.set_as_current = set_as_current
self.registry_cls = symbol_by_name(self.registry_cls)
self.user_options = defaultdict(set)
self.steps = defaultdict(set)
self.autofinalize = autofinalize
self.configured = False
self._config_source = config_source
self._pending_defaults = deque()
self._pending_periodic_tasks = deque()
self.finalized = False
self._finalize_mutex = threading.Lock()
self._pending = deque()
self._tasks = tasks
if not isinstance(self._tasks, TaskRegistry):
self._tasks = TaskRegistry(self._tasks or {})
# If the class defines a custom __reduce_args__ we need to use
# the old way of pickling apps, which is pickling a list of
# args instead of the new way that pickles a dict of keywords.
self._using_v1_reduce = app_has_custom(self, '__reduce_args__')
# these options are moved to the config to
# simplify pickling of the app object.
self._preconf = changes or {}
if broker:
self._preconf['BROKER_URL'] = broker
if backend:
self._preconf['CELERY_RESULT_BACKEND'] = backend
if include:
self._preconf['CELERY_IMPORTS'] = include
# - Apply fixups.
self.fixups = set(self.builtin_fixups) if fixups is None else fixups
# ...store fixup instances in _fixups to keep weakrefs alive.
self._fixups = [symbol_by_name(fixup)(self) for fixup in self.fixups]
if self.set_as_current:
self.set_current()
# Signals
if self.on_configure is None:
# used to be a method pre 4.0
self.on_configure = Signal()
self.on_after_configure = Signal()
self.on_after_finalize = Signal()
self.on_init()
_register_app(self)
def set_current(self):
_set_current_app(self)
def set_default(self):
set_default_app(self)
def __enter__(self):
return self
def __exit__(self, *exc_info):
self.close()
def close(self):
self._maybe_close_pool()
def on_init(self):
"""Optional callback called at init."""
pass
def start(self, argv=None):
return instantiate(
'celery.bin.celery:CeleryCommand',
app=self).execute_from_commandline(argv)
def worker_main(self, argv=None):
return instantiate(
'celery.bin.worker:worker',
app=self).execute_from_commandline(argv)
def task(self, *args, **opts):
"""Creates new task class from any callable."""
if _EXECV and opts.get('lazy', True):
# When using execv the task in the original module will point to a
# different app, so doing things like 'add.request' will point to
# a different task instance. This makes sure it will always use
# the task instance from the current app.
# Really need a better solution for this :(
from . import shared_task
return shared_task(*args, lazy=False, **opts)
def inner_create_task_cls(shared=True, filter=None, lazy=True, **opts):
_filt = filter # stupid 2to3
def _create_task_cls(fun):
if shared:
def cons(app):
return app._task_from_fun(fun, **opts)
cons.__name__ = fun.__name__
connect_on_app_finalize(cons)
if not lazy or self.finalized:
ret = self._task_from_fun(fun, **opts)
else:
# return a proxy object that evaluates on first use
ret = PromiseProxy(self._task_from_fun, (fun,), opts,
__doc__=fun.__doc__)
self._pending.append(ret)
if _filt:
return _filt(ret)
return ret
return _create_task_cls
if len(args) == 1:
if callable(args[0]):
return inner_create_task_cls(**opts)(*args)
raise TypeError('argument 1 to @task() must be a callable')
if args:
raise TypeError(
'@task() takes exactly 1 argument ({0} given)'.format(
sum([len(args), len(opts)])))
return inner_create_task_cls(**opts)
def _task_from_fun(self, fun, name=None, base=None, bind=False, **options):
if not self.finalized and not self.autofinalize:
raise RuntimeError('Contract breach: app not finalized')
name = name or self.gen_task_name(fun.__name__, fun.__module__)
base = base or self.Task
if name not in self._tasks:
run = fun if bind else staticmethod(fun)
task = type(fun.__name__, (base,), dict({
'app': self,
'name': name,
'run': run,
'_decorated': True,
'__doc__': fun.__doc__,
'__module__': fun.__module__,
'__header__': staticmethod(head_from_fun(fun, bound=bind)),
'__wrapped__': run}, **options))()
self._tasks[task.name] = task
task.bind(self) # connects task to this app
autoretry_for = tuple(options.get('autoretry_for', ()))
retry_kwargs = options.get('retry_kwargs', {})
if autoretry_for and not hasattr(task, '_orig_run'):
@wraps(task.run)
def run(*args, **kwargs):
try:
return task._orig_run(*args, **kwargs)
except autoretry_for as exc:
raise task.retry(exc=exc, **retry_kwargs)
task._orig_run, task.run = task.run, run
else:
task = self._tasks[name]
return task
def gen_task_name(self, name, module):
return gen_task_name(self, name, module)
def finalize(self, auto=False):
with self._finalize_mutex:
if not self.finalized:
if auto and not self.autofinalize:
raise RuntimeError('Contract breach: app not finalized')
self.finalized = True
_announce_app_finalized(self)
pending = self._pending
while pending:
maybe_evaluate(pending.popleft())
for task in values(self._tasks):
task.bind(self)
self.on_after_finalize.send(sender=self)
def add_defaults(self, fun):
if not callable(fun):
d, fun = fun, lambda: d
if self.configured:
return self._conf.add_defaults(fun())
self._pending_defaults.append(fun)
def config_from_object(self, obj, silent=False, force=False):
self._config_source = obj
if force or self.configured:
self._conf = None
return self.loader.config_from_object(obj, silent=silent)
def config_from_envvar(self, variable_name, silent=False, force=False):
module_name = os.environ.get(variable_name)
if not module_name:
if silent:
return False
raise ImproperlyConfigured(
ERR_ENVVAR_NOT_SET.format(variable_name))
return self.config_from_object(module_name, silent=silent, force=force)
def config_from_cmdline(self, argv, namespace='celery'):
(self._conf if self.configured else self.conf).update(
self.loader.cmdline_config_parser(argv, namespace)
)
def setup_security(self, allowed_serializers=None, key=None, cert=None,
store=None, digest='sha1', serializer='json'):
from celery.security import setup_security
return setup_security(allowed_serializers, key, cert,
store, digest, serializer, app=self)
def autodiscover_tasks(self, packages=None,
related_name='tasks', force=False):
if force:
return self._autodiscover_tasks(packages, related_name)
signals.import_modules.connect(promise(
self._autodiscover_tasks, (packages, related_name),
), weak=False, sender=self)
def _autodiscover_tasks(self, packages, related_name, **kwargs):
if packages:
return self._autodiscover_tasks_from_names(packages, related_name)
return self._autodiscover_tasks_from_fixups(related_name)
def _autodiscover_tasks_from_names(self, packages, related_name):
# packages argument can be lazy
return self.loader.autodiscover_tasks(
packages() if callable(packages) else packages, related_name,
)
def _autodiscover_tasks_from_fixups(self, related_name):
return self._autodiscover_tasks_from_names([
pkg for fixup in self._fixups
for pkg in fixup.autodiscover_tasks()
if hasattr(fixup, 'autodiscover_tasks')
], related_name=related_name)
def send_task(self, name, args=None, kwargs=None, countdown=None,
eta=None, task_id=None, producer=None, connection=None,
router=None, result_cls=None, expires=None,
publisher=None, link=None, link_error=None,
add_to_parent=True, group_id=None, retries=0, chord=None,
reply_to=None, time_limit=None, soft_time_limit=None,
root_id=None, parent_id=None, route_name=None,
shadow=None, **options):
amqp = self.amqp
task_id = task_id or uuid()
producer = producer or publisher # XXX compat
router = router or amqp.router
conf = self.conf
if conf.CELERY_ALWAYS_EAGER: # pragma: no cover
warnings.warn(AlwaysEagerIgnored(
'CELERY_ALWAYS_EAGER has no effect on send_task',
), stacklevel=2)
options = router.route(options, route_name or name, args, kwargs)
message = amqp.create_task_message(
task_id, name, args, kwargs, countdown, eta, group_id,
expires, retries, chord,
maybe_list(link), maybe_list(link_error),
reply_to or self.oid, time_limit, soft_time_limit,
self.conf.CELERY_SEND_TASK_SENT_EVENT,
root_id, parent_id, shadow,
)
if connection:
producer = amqp.Producer(connection)
with self.producer_or_acquire(producer) as P:
self.backend.on_task_call(P, task_id)
amqp.send_task_message(P, name, message, **options)
result = (result_cls or self.AsyncResult)(task_id)
if add_to_parent:
parent = get_current_worker_task()
if parent:
parent.add_trail(result)
return result
def connection(self, hostname=None, userid=None, password=None,
virtual_host=None, port=None, ssl=None,
connect_timeout=None, transport=None,
transport_options=None, heartbeat=None,
login_method=None, failover_strategy=None, **kwargs):
conf = self.conf
return self.amqp.Connection(
hostname or conf.BROKER_URL,
userid or conf.BROKER_USER,
password or conf.BROKER_PASSWORD,
virtual_host or conf.BROKER_VHOST,
port or conf.BROKER_PORT,
transport=transport or conf.BROKER_TRANSPORT,
ssl=self.either('BROKER_USE_SSL', ssl),
heartbeat=heartbeat,
login_method=login_method or conf.BROKER_LOGIN_METHOD,
failover_strategy=(
failover_strategy or conf.BROKER_FAILOVER_STRATEGY
),
transport_options=dict(
conf.BROKER_TRANSPORT_OPTIONS, **transport_options or {}
),
connect_timeout=self.either(
'BROKER_CONNECTION_TIMEOUT', connect_timeout
),
)
broker_connection = connection
def _acquire_connection(self, pool=True):
"""Helper for :meth:`connection_or_acquire`."""
if pool:
return self.pool.acquire(block=True)
return self.connection()
def connection_or_acquire(self, connection=None, pool=True, *_, **__):
return FallbackContext(connection, self._acquire_connection, pool=pool)
default_connection = connection_or_acquire # XXX compat
def producer_or_acquire(self, producer=None):
return FallbackContext(
producer, self.amqp.producer_pool.acquire, block=True,
)
default_producer = producer_or_acquire # XXX compat
def prepare_config(self, c):
"""Prepare configuration before it is merged with the defaults."""
return find_deprecated_settings(c)
def now(self):
return self.loader.now(utc=self.conf.CELERY_ENABLE_UTC)
def mail_admins(self, subject, body, fail_silently=False):
conf = self.conf
if conf.ADMINS:
to = [admin_email for _, admin_email in conf.ADMINS]
return self.loader.mail_admins(
subject, body, fail_silently, to=to,
sender=conf.SERVER_EMAIL,
host=conf.EMAIL_HOST,
port=conf.EMAIL_PORT,
user=conf.EMAIL_HOST_USER,
password=conf.EMAIL_HOST_PASSWORD,
timeout=conf.EMAIL_TIMEOUT,
use_ssl=conf.EMAIL_USE_SSL,
use_tls=conf.EMAIL_USE_TLS,
charset=conf.EMAIL_CHARSET,
)
def select_queues(self, queues=None):
return self.amqp.queues.select(queues)
def either(self, default_key, *values):
"""Fallback to the value of a configuration key if none of the
`*values` are true."""
return first(None, values) or self.conf.get(default_key)
def bugreport(self):
return bugreport(self)
def _get_backend(self):
from celery.backends import get_backend_by_url
backend, url = get_backend_by_url(
self.backend_cls or self.conf.CELERY_RESULT_BACKEND,
self.loader)
return backend(app=self, url=url)
def _load_config(self):
if isinstance(self.on_configure, Signal):
self.on_configure.send(sender=self)
else:
# used to be a method pre 4.0
self.on_configure()
if self._config_source:
self.loader.config_from_object(self._config_source)
defaults = dict(deepcopy(DEFAULTS), **self._preconf)
self.configured = True
s = self._conf = Settings(
{}, [self.prepare_config(self.loader.conf), defaults],
)
# load lazy config dict initializers.
pending_def = self._pending_defaults
while pending_def:
s.add_defaults(maybe_evaluate(pending_def.popleft()()))
# load lazy periodic tasks
pending_beat = self._pending_periodic_tasks
while pending_beat:
self._add_periodic_task(*pending_beat.popleft())
# Settings.__setitem__ method, set Settings.change
if self._preconf:
for key, value in items(self._preconf):
setattr(s, key, value)
self.on_after_configure.send(sender=self, source=s)
return s
def _after_fork(self, obj_):
self._maybe_close_pool()
def _maybe_close_pool(self):
if self._pool:
self._pool.force_close_all()
self._pool = None
amqp = self.__dict__.get('amqp')
if amqp is not None and amqp._producer_pool is not None:
amqp._producer_pool.force_close_all()
amqp._producer_pool = None
def signature(self, *args, **kwargs):
kwargs['app'] = self
return self.canvas.signature(*args, **kwargs)
def add_periodic_task(self, schedule, sig,
args=(), kwargs=(), name=None, **opts):
key, entry = self._sig_to_periodic_task_entry(
schedule, sig, args, kwargs, name, **opts)
if self.configured:
self._add_periodic_task(key, entry)
else:
self._pending_periodic_tasks.append((key, entry))
return key
def _sig_to_periodic_task_entry(self, schedule, sig,
args=(), kwargs={}, name=None, **opts):
sig = (sig.clone(args, kwargs)
if isinstance(sig, abstract.CallableSignature)
else self.signature(sig.name, args, kwargs))
return name or repr(sig), {
'schedule': schedule,
'task': sig.name,
'args': sig.args,
'kwargs': sig.kwargs,
'options': dict(sig.options, **opts),
}
def _add_periodic_task(self, key, entry):
self._conf.CELERYBEAT_SCHEDULE[key] = entry
def create_task_cls(self):
"""Creates a base task class using default configuration
taken from this app."""
return self.subclass_with_self(
self.task_cls, name='Task', attribute='_app',
keep_reduce=True, abstract=True,
)
def subclass_with_self(self, Class, name=None, attribute='app',
reverse=None, keep_reduce=False, **kw):
"""Subclass an app-compatible class by setting its app attribute
to be this app instance.
App-compatible means that the class has a class attribute that
provides the default app it should use, e.g.
``class Foo: app = None``.
:param Class: The app-compatible class to subclass.
:keyword name: Custom name for the target class.
:keyword attribute: Name of the attribute holding the app,
default is 'app'.
"""
Class = symbol_by_name(Class)
reverse = reverse if reverse else Class.__name__
def __reduce__(self):
return _unpickle_appattr, (reverse, self.__reduce_args__())
attrs = dict({attribute: self}, __module__=Class.__module__,
__doc__=Class.__doc__, **kw)
if not keep_reduce:
attrs['__reduce__'] = __reduce__
return type(name or Class.__name__, (Class,), attrs)
def _rgetattr(self, path):
return attrgetter(path)(self)
def __repr__(self):
return '<{0} {1}>'.format(type(self).__name__, appstr(self))
def __reduce__(self):
if self._using_v1_reduce:
return self.__reduce_v1__()
return (_unpickle_app_v2, (self.__class__, self.__reduce_keys__()))
def __reduce_v1__(self):
# Reduce only pickles the configuration changes,
# so the default configuration doesn't have to be passed
# between processes.
return (
_unpickle_app,
(self.__class__, self.Pickler) + self.__reduce_args__(),
)
def __reduce_keys__(self):
"""Return keyword arguments used to reconstruct the object
when unpickling."""
return {
'main': self.main,
'changes': self._conf.changes if self._conf else self._preconf,
'loader': self.loader_cls,
'backend': self.backend_cls,
'amqp': self.amqp_cls,
'events': self.events_cls,
'log': self.log_cls,
'control': self.control_cls,
'fixups': self.fixups,
'config_source': self._config_source,
'task_cls': self.task_cls,
}
def __reduce_args__(self):
"""Deprecated method, please use :meth:`__reduce_keys__` instead."""
return (self.main, self._conf.changes if self._conf else {},
self.loader_cls, self.backend_cls, self.amqp_cls,
self.events_cls, self.log_cls, self.control_cls,
False, self._config_source)
@cached_property
def Worker(self):
return self.subclass_with_self('celery.apps.worker:Worker')
@cached_property
def WorkController(self, **kwargs):
return self.subclass_with_self('celery.worker:WorkController')
@cached_property
def Beat(self, **kwargs):
return self.subclass_with_self('celery.apps.beat:Beat')
@cached_property
def Task(self):
return self.create_task_cls()
@cached_property
def annotations(self):
return prepare_annotations(self.conf.CELERY_ANNOTATIONS)
@cached_property
def AsyncResult(self):
return self.subclass_with_self('celery.result:AsyncResult')
@cached_property
def ResultSet(self):
return self.subclass_with_self('celery.result:ResultSet')
@cached_property
def GroupResult(self):
return self.subclass_with_self('celery.result:GroupResult')
@cached_property
def TaskSet(self): # XXX compat
"""Deprecated! Please use :class:`celery.group` instead."""
return self.subclass_with_self('celery.task.sets:TaskSet')
@cached_property
def TaskSetResult(self): # XXX compat
"""Deprecated! Please use :attr:`GroupResult` instead."""
return self.subclass_with_self('celery.result:TaskSetResult')
@property
def pool(self):
if self._pool is None:
_ensure_after_fork()
limit = self.conf.BROKER_POOL_LIMIT
self._pool = self.connection().Pool(limit=limit)
return self._pool
@property
def current_task(self):
return _task_stack.top
@cached_property
def oid(self):
return oid_from(self)
@cached_property
def amqp(self):
return instantiate(self.amqp_cls, app=self)
@cached_property
def backend(self):
return self._get_backend()
@property
def conf(self):
if self._conf is None:
self._load_config()
return self._conf
@conf.setter
def conf(self, d): # noqa
self._conf = d
@cached_property
def control(self):
return instantiate(self.control_cls, app=self)
@cached_property
def events(self):
return instantiate(self.events_cls, app=self)
@cached_property
def loader(self):
return get_loader_cls(self.loader_cls)(app=self)
@cached_property
def log(self):
return instantiate(self.log_cls, app=self)
@cached_property
def canvas(self):
from celery import canvas
return canvas
@cached_property
def tasks(self):
self.finalize(auto=True)
return self._tasks
@cached_property
def timezone(self):
from celery.utils.timeutils import timezone
conf = self.conf
tz = conf.CELERY_TIMEZONE
if not tz:
return (timezone.get_timezone('UTC') if conf.CELERY_ENABLE_UTC
else timezone.local)
return timezone.get_timezone(conf.CELERY_TIMEZONE)
gc.collect()
def receiver_1_arg(val, **kwargs):
return val
class Callable(object):
def __call__(self, val, **kwargs):
return val
def a(self, val, **kwargs):
return val
a_signal = Signal(providing_args=["val"])
class DispatcherTests(Case):
"""Test suite for dispatcher (barely started)"""
def _testIsClean(self, signal):
"""Assert that everything has been cleaned up automatically"""
self.assertEqual(signal.receivers, [])
# force cleanup just in case
signal.receivers = []
def testExact(self):
a_signal.connect(receiver_1_arg, sender=self)
expected = [(receiver_1_arg, "test")]
result = a_signal.send(sender=self, val="test")
"""Embedded workers for integration tests."""
from __future__ import absolute_import, unicode_literals
import os
import threading
from contextlib import contextmanager
from celery import worker
from celery.result import allow_join_result, _set_task_join_will_block
from celery.utils.dispatch import Signal
from celery.utils.nodenames import anon_nodename
test_worker_starting = Signal(providing_args=[])
test_worker_started = Signal(providing_args=['worker', 'consumer'])
test_worker_stopped = Signal(providing_args=['worker'])
WORKER_LOGLEVEL = os.environ.get('WORKER_LOGLEVEL', 'error')
class TestWorkController(worker.WorkController):
"""Worker that can synchronize on being fully started."""
def __init__(self, *args, **kwargs):
# type: (*Any, **Any) -> None
self._on_started = threading.Event()
super(TestWorkController, self).__init__(*args, **kwargs)
def on_consumer_ready(self, consumer):
# type: (celery.worker.consumer.Consumer) -> None
"""Callback called when the Consumer blueprint is fully started."""
self._on_started.set()
class Celery(object):
"""Celery application.
:param main: Name of the main module if running as `__main__`.
This is used as a prefix for task names.
:keyword broker: URL of the default broker used.
:keyword loader: The loader class, or the name of the loader class to use.
Default is :class:`celery.loaders.app.AppLoader`.
:keyword backend: The result store backend class, or the name of the
backend class to use. Default is the value of the
:setting:`result_backend` setting.
:keyword amqp: AMQP object or class name.
:keyword events: Events object or class name.
:keyword log: Log object or class name.
:keyword control: Control object or class name.
:keyword set_as_current: Make this the global current app.
:keyword tasks: A task registry or the name of a registry class.
:keyword include: List of modules every worker should import.
:keyword fixups: List of fixup plug-ins (see e.g.
:mod:`celery.fixups.django`).
:keyword autofinalize: If set to False a :exc:`RuntimeError`
will be raised if the task registry or tasks are used before
the app is finalized.
"""
#: This is deprecated, use :meth:`reduce_keys` instead
Pickler = AppPickler
SYSTEM = platforms.SYSTEM
IS_OSX, IS_WINDOWS = platforms.IS_OSX, platforms.IS_WINDOWS
#: Name of the `__main__` module. Required for standalone scripts.
#:
#: If set this will be used instead of `__main__` when automatically
#: generating task names.
main = None
#: Custom options for command-line programs.
#: See :ref:`extending-commandoptions`
user_options = None
#: Custom bootsteps to extend and modify the worker.
#: See :ref:`extending-bootsteps`.
steps = None
amqp_cls = 'celery.app.amqp:AMQP'
backend_cls = None
events_cls = 'celery.events:Events'
loader_cls = 'celery.loaders.app:AppLoader'
log_cls = 'celery.app.log:Logging'
control_cls = 'celery.app.control:Control'
task_cls = 'celery.app.task:Task'
registry_cls = TaskRegistry
_fixups = None
_pool = None
_conf = None
builtin_fixups = BUILTIN_FIXUPS
_after_fork_registered = False
#: Signal sent when app is loading configuration.
on_configure = None
#: Signal sent after app has prepared the configuration.
on_after_configure = None
#: Signal sent after app has been finalized.
on_after_finalize = None
#: Signal sent by every new process after fork.
on_after_fork = None
def __init__(self, main=None, loader=None, backend=None,
amqp=None, events=None, log=None, control=None,
set_as_current=True, tasks=None, broker=None, include=None,
changes=None, config_source=None, fixups=None, task_cls=None,
autofinalize=True, namespace=None, **kwargs):
self.clock = LamportClock()
self.main = main
self.amqp_cls = amqp or self.amqp_cls
self.events_cls = events or self.events_cls
self.loader_cls = loader or self.loader_cls
self.log_cls = log or self.log_cls
self.control_cls = control or self.control_cls
self.task_cls = task_cls or self.task_cls
self.set_as_current = set_as_current
self.registry_cls = symbol_by_name(self.registry_cls)
self.user_options = defaultdict(set)
self.steps = defaultdict(set)
self.autofinalize = autofinalize
self.namespace = namespace
self.configured = False
self._config_source = config_source
self._pending_defaults = deque()
self._pending_periodic_tasks = deque()
self.finalized = False
self._finalize_mutex = threading.Lock()
self._pending = deque()
self._tasks = tasks
if not isinstance(self._tasks, TaskRegistry):
self._tasks = TaskRegistry(self._tasks or {})
# If the class defines a custom __reduce_args__ we need to use
# the old way of pickling apps, which is pickling a list of
# args instead of the new way that pickles a dict of keywords.
self._using_v1_reduce = app_has_custom(self, '__reduce_args__')
# these options are moved to the config to
# simplify pickling of the app object.
self._preconf = changes or {}
self._preconf_set_by_auto = set()
self.__autoset('broker_url', broker)
self.__autoset('result_backend', backend)
self.__autoset('include', include)
self._conf = Settings(
PendingConfiguration(
self._preconf, self._get_from_conf_and_finalize),
prefix=self.namespace,
)
# - Apply fixups.
self.fixups = set(self.builtin_fixups) if fixups is None else fixups
# ...store fixup instances in _fixups to keep weakrefs alive.
self._fixups = [symbol_by_name(fixup)(self) for fixup in self.fixups]
if self.set_as_current:
self.set_current()
# Signals
if self.on_configure is None:
# used to be a method pre 4.0
self.on_configure = Signal()
self.on_after_configure = Signal()
self.on_after_finalize = Signal()
self.on_after_fork = Signal()
self.on_init()
_register_app(self)
def __autoset(self, key, value):
if value:
self._preconf[key] = value
self._preconf_set_by_auto.add(key)
def set_current(self):
"""Makes this the current app for this thread."""
_set_current_app(self)
def set_default(self):
"""Makes this the default app for all threads."""
set_default_app(self)
def _ensure_after_fork(self):
if not self._after_fork_registered:
self._after_fork_registered = True
if register_after_fork is not None:
register_after_fork(self, _after_fork_cleanup_app)
def __enter__(self):
return self
def __exit__(self, *exc_info):
self.close()
def close(self):
"""Clean up after the application.
Only necessary for dynamically created apps for which you can
use the with statement instead::
with Celery(set_as_current=False) as app:
with app.connection_for_write() as conn:
pass
"""
self._pool = None
_deregister_app(self)
def on_init(self):
"""Optional callback called at init."""
pass
def start(self, argv=None):
"""Run :program:`celery` using `argv`.
Uses :data:`sys.argv` if `argv` is not specified.
"""
return instantiate(
'celery.bin.celery:CeleryCommand',
app=self).execute_from_commandline(argv)
def worker_main(self, argv=None):
"""Run :program:`celery worker` using `argv`.
Uses :data:`sys.argv` if `argv` is not specified.
"""
return instantiate(
'celery.bin.worker:worker',
app=self).execute_from_commandline(argv)
def task(self, *args, **opts):
"""Decorator to create a task class out of any callable.
Examples:
.. code-block:: python
@app.task
def refresh_feed(url):
return …
with setting extra options:
.. code-block:: python
@app.task(exchange="feeds")
def refresh_feed(url):
return …
.. admonition:: App Binding
For custom apps the task decorator will return a proxy
object, so that the act of creating the task is not performed
until the task is used or the task registry is accessed.
If you are depending on binding to be deferred, then you must
not access any attributes on the returned object until the
application is fully set up (finalized).
"""
if _EXECV and opts.get('lazy', True):
# When using execv the task in the original module will point to a
# different app, so doing things like 'add.request' will point to
# a different task instance. This makes sure it will always use
# the task instance from the current app.
# Really need a better solution for this :(
from . import shared_task
return shared_task(*args, lazy=False, **opts)
def inner_create_task_cls(shared=True, filter=None, lazy=True, **opts):
_filt = filter # stupid 2to3
def _create_task_cls(fun):
if shared:
def cons(app):
return app._task_from_fun(fun, **opts)
cons.__name__ = fun.__name__
connect_on_app_finalize(cons)
if not lazy or self.finalized:
ret = self._task_from_fun(fun, **opts)
else:
# return a proxy object that evaluates on first use
ret = PromiseProxy(self._task_from_fun, (fun,), opts,
__doc__=fun.__doc__)
self._pending.append(ret)
if _filt:
return _filt(ret)
return ret
return _create_task_cls
if len(args) == 1:
if callable(args[0]):
return inner_create_task_cls(**opts)(*args)
raise TypeError('argument 1 to @task() must be a callable')
if args:
raise TypeError(
'@task() takes exactly 1 argument ({0} given)'.format(
sum([len(args), len(opts)])))
return inner_create_task_cls(**opts)
def _task_from_fun(self, fun, name=None, base=None, bind=False, **options):
if not self.finalized and not self.autofinalize:
raise RuntimeError('Contract breach: app not finalized')
name = name or self.gen_task_name(fun.__name__, fun.__module__)
base = base or self.Task
if name not in self._tasks:
run = fun if bind else staticmethod(fun)
task = type(fun.__name__, (base,), dict({
'app': self,
'name': name,
'run': run,
'_decorated': True,
'__doc__': fun.__doc__,
'__module__': fun.__module__,
'__header__': staticmethod(head_from_fun(fun, bound=bind)),
'__wrapped__': run}, **options))()
self._tasks[task.name] = task
task.bind(self) # connects task to this app
autoretry_for = tuple(options.get('autoretry_for', ()))
retry_kwargs = options.get('retry_kwargs', {})
if autoretry_for and not hasattr(task, '_orig_run'):
@wraps(task.run)
def run(*args, **kwargs):
try:
return task._orig_run(*args, **kwargs)
except autoretry_for as exc:
raise task.retry(exc=exc, **retry_kwargs)
task._orig_run, task.run = task.run, run
else:
task = self._tasks[name]
return task
def gen_task_name(self, name, module):
return gen_task_name(self, name, module)
def finalize(self, auto=False):
"""Finalizes the app by loading built-in tasks,
and evaluating pending task decorators."""
with self._finalize_mutex:
if not self.finalized:
if auto and not self.autofinalize:
raise RuntimeError('Contract breach: app not finalized')
self.finalized = True
_announce_app_finalized(self)
pending = self._pending
while pending:
maybe_evaluate(pending.popleft())
for task in values(self._tasks):
task.bind(self)
self.on_after_finalize.send(sender=self)
def add_defaults(self, fun):
"""Add default configuration from dict ``d``.
If the argument is a callable function then it will be regarded
as a promise, and it won't be loaded until the configuration is
actually needed.
This method can be compared to::
>>> celery.conf.update(d)
with a difference that 1) no copy will be made and 2) the dict will
not be transferred when the worker spawns child processes, so
it's important that the same configuration happens at import time
when pickle restores the object on the other side.
"""
if not callable(fun):
d, fun = fun, lambda: d
if self.configured:
return self._conf.add_defaults(fun())
self._pending_defaults.append(fun)
def config_from_object(self, obj,
silent=False, force=False, namespace=None):
"""Reads configuration from object, where object is either
an object or the name of a module to import.
:keyword silent: If true then import errors will be ignored.
:keyword force: Force reading configuration immediately.
By default the configuration will be read only when required.
.. code-block:: pycon
>>> celery.config_from_object("myapp.celeryconfig")
>>> from myapp import celeryconfig
>>> celery.config_from_object(celeryconfig)
"""
self._config_source = obj
self.namespace = namespace or self.namespace
if force or self.configured:
self._conf = None
if self.loader.config_from_object(obj, silent=silent):
return self.conf
def config_from_envvar(self, variable_name, silent=False, force=False):
"""Read configuration from environment variable.
The value of the environment variable must be the name
of a module to import.
.. code-block:: pycon
>>> os.environ["CELERY_CONFIG_MODULE"] = "myapp.celeryconfig"
>>> celery.config_from_envvar("CELERY_CONFIG_MODULE")
"""
module_name = os.environ.get(variable_name)
if not module_name:
if silent:
return False
raise ImproperlyConfigured(
ERR_ENVVAR_NOT_SET.format(variable_name))
return self.config_from_object(module_name, silent=silent, force=force)
def config_from_cmdline(self, argv, namespace='celery'):
self._conf.update(
self.loader.cmdline_config_parser(argv, namespace)
)
def setup_security(self, allowed_serializers=None, key=None, cert=None,
store=None, digest='sha1', serializer='json'):
"""Setup the message-signing serializer.
This will affect all application instances (a global operation).
Disables untrusted serializers and if configured to use the ``auth``
serializer will register the auth serializer with the provided settings
into the Kombu serializer registry.
:keyword allowed_serializers: List of serializer names, or
content_types that should be exempt from being disabled.
:keyword key: Name of private key file to use.
Defaults to the :setting:`security_key` setting.
:keyword cert: Name of certificate file to use.
Defaults to the :setting:`security_certificate` setting.
:keyword store: Directory containing certificates.
Defaults to the :setting:`security_cert_store` setting.
:keyword digest: Digest algorithm used when signing messages.
Default is ``sha1``.
:keyword serializer: Serializer used to encode messages after
they have been signed. See :setting:`task_serializer` for
the serializers supported.
Default is ``json``.
"""
from celery.security import setup_security
return setup_security(allowed_serializers, key, cert,
store, digest, serializer, app=self)
def autodiscover_tasks(self, packages=None,
related_name='tasks', force=False):
"""Try to autodiscover and import modules with a specific name (by
default 'tasks').
If the name is empty, this will be delegated to fixups (e.g. Django).
For example if you have an (imagined) directory tree like this::
foo/__init__.py
tasks.py
models.py
bar/__init__.py
tasks.py
models.py
baz/__init__.py
models.py
Then calling ``app.autodiscover_tasks(['foo', bar', 'baz'])`` will
result in the modules ``foo.tasks`` and ``bar.tasks`` being imported.
:param packages: List of packages to search.
This argument may also be a callable, in which case the
value returned is used (for lazy evaluation).
:keyword related_name: The name of the module to find. Defaults
to "tasks", which means it look for "module.tasks" for every
module in ``packages``.
:keyword force: By default this call is lazy so that the actual
autodiscovery will not happen until an application imports the
default modules. Forcing will cause the autodiscovery to happen
immediately.
"""
if force:
return self._autodiscover_tasks(packages, related_name)
signals.import_modules.connect(starpromise(
self._autodiscover_tasks, packages, related_name,
), weak=False, sender=self)
def _autodiscover_tasks(self, packages, related_name, **kwargs):
if packages:
return self._autodiscover_tasks_from_names(packages, related_name)
return self._autodiscover_tasks_from_fixups(related_name)
def _autodiscover_tasks_from_names(self, packages, related_name):
# packages argument can be lazy
return self.loader.autodiscover_tasks(
packages() if callable(packages) else packages, related_name,
)
def _autodiscover_tasks_from_fixups(self, related_name):
return self._autodiscover_tasks_from_names([
pkg for fixup in self._fixups
for pkg in fixup.autodiscover_tasks()
if hasattr(fixup, 'autodiscover_tasks')
], related_name=related_name)
def send_task(self, name, args=None, kwargs=None, countdown=None,
eta=None, task_id=None, producer=None, connection=None,
router=None, result_cls=None, expires=None,
publisher=None, link=None, link_error=None,
add_to_parent=True, group_id=None, retries=0, chord=None,
reply_to=None, time_limit=None, soft_time_limit=None,
root_id=None, parent_id=None, route_name=None,
shadow=None, chain=None, **options):
"""Send task by name.
:param name: Name of task to call (e.g. `"tasks.add"`).
:keyword result_cls: Specify custom result class. Default is
using :meth:`AsyncResult`.
Otherwise supports the same arguments as :meth:`@-Task.apply_async`.
"""
parent = have_parent = None
amqp = self.amqp
task_id = task_id or uuid()
producer = producer or publisher # XXX compat
router = router or amqp.router
conf = self.conf
if conf.task_always_eager: # pragma: no cover
warnings.warn(AlwaysEagerIgnored(
'task_always_eager has no effect on send_task',
), stacklevel=2)
options = router.route(options, route_name or name, args, kwargs)
if root_id is None:
parent, have_parent = self.current_worker_task, True
if parent:
root_id = parent.request.root_id or parent.request.id
if parent_id is None:
if not have_parent:
parent, have_parent = self.current_worker_task, True
if parent:
parent_id = parent.request.id
message = amqp.create_task_message(
task_id, name, args, kwargs, countdown, eta, group_id,
expires, retries, chord,
maybe_list(link), maybe_list(link_error),
reply_to or self.oid, time_limit, soft_time_limit,
self.conf.task_send_sent_event,
root_id, parent_id, shadow, chain,
)
if connection:
producer = amqp.Producer(connection)
with self.producer_or_acquire(producer) as P:
self.backend.on_task_call(P, task_id)
amqp.send_task_message(P, name, message, **options)
result = (result_cls or self.AsyncResult)(task_id)
if add_to_parent:
if not have_parent:
parent, have_parent = self.current_worker_task, True
if parent:
parent.add_trail(result)
return result
def connection_for_read(self, url=None, **kwargs):
"""Establish connection used for consuming.
See :meth:`connection` for supported arguments.
"""
return self._connection(url or self.conf.broker_read_url, **kwargs)
def connection_for_write(self, url=None, **kwargs):
"""Establish connection used for producing.
See :meth:`connection` for supported arguments.
"""
return self._connection(url or self.conf.broker_write_url, **kwargs)
def connection(self, hostname=None, userid=None, password=None,
virtual_host=None, port=None, ssl=None,
connect_timeout=None, transport=None,
transport_options=None, heartbeat=None,
login_method=None, failover_strategy=None, **kwargs):
"""Establish a connection to the message broker.
Please use :meth:`connection_for_read` and
:meth:`connection_for_write` instead, to convey the intent
of use for this connection.
:param url: Either the URL or the hostname of the broker to use.
:keyword hostname: URL, Hostname/IP-address of the broker.
If an URL is used, then the other argument below will
be taken from the URL instead.
:keyword userid: Username to authenticate as.
:keyword password: Password to authenticate with
:keyword virtual_host: Virtual host to use (domain).
:keyword port: Port to connect to.
:keyword ssl: Defaults to the :setting:`broker_use_ssl` setting.
:keyword transport: defaults to the :setting:`broker_transport`
setting.
:keyword transport_options: Dictionary of transport specific options.
:keyword heartbeat: AMQP Heartbeat in seconds (pyamqp only).
:keyword login_method: Custom login method to use (amqp only).
:keyword failover_strategy: Custom failover strategy.
:keyword \*\*kwargs: Additional arguments to :class:`kombu.Connection`.
:returns :class:`kombu.Connection`:
"""
return self.connection_for_write(
hostname or self.conf.broker_write_url,
userid=userid, password=password,
virtual_host=virtual_host, port=port, ssl=ssl,
connect_timeout=connect_timeout, transport=transport,
transport_options=transport_options, heartbeat=heartbeat,
login_method=login_method, failover_strategy=failover_strategy,
**kwargs
)
def _connection(self, url, userid=None, password=None,
virtual_host=None, port=None, ssl=None,
connect_timeout=None, transport=None,
transport_options=None, heartbeat=None,
login_method=None, failover_strategy=None, **kwargs):
conf = self.conf
return self.amqp.Connection(
url,
userid or conf.broker_user,
password or conf.broker_password,
virtual_host or conf.broker_vhost,
port or conf.broker_port,
transport=transport or conf.broker_transport,
ssl=self.either('broker_use_ssl', ssl),
heartbeat=heartbeat,
login_method=login_method or conf.broker_login_method,
failover_strategy=(
failover_strategy or conf.broker_failover_strategy
),
transport_options=dict(
conf.broker_transport_options, **transport_options or {}
),
connect_timeout=self.either(
'broker_connection_timeout', connect_timeout
),
)
broker_connection = connection
def _acquire_connection(self, pool=True):
"""Helper for :meth:`connection_or_acquire`."""
if pool:
return self.pool.acquire(block=True)
return self.connection_for_write()
def connection_or_acquire(self, connection=None, pool=True, *_, **__):
"""For use within a with-statement to get a connection from the pool
if one is not already provided.
:keyword connection: If not provided, then a connection will be
acquired from the connection pool.
"""
return FallbackContext(connection, self._acquire_connection, pool=pool)
default_connection = connection_or_acquire # XXX compat
def producer_or_acquire(self, producer=None):
"""For use within a with-statement to get a producer from the pool
if one is not already provided
:keyword producer: If not provided, then a producer will be
acquired from the producer pool.
"""
return FallbackContext(
producer, self.amqp.producer_pool.acquire, block=True,
)
default_producer = producer_or_acquire # XXX compat
def prepare_config(self, c):
"""Prepare configuration before it is merged with the defaults."""
return find_deprecated_settings(c)
def now(self):
"""Return the current time and date as a
:class:`~datetime.datetime` object."""
return self.loader.now(utc=self.conf.enable_utc)
def mail_admins(self, subject, body, fail_silently=False):
"""Sends an email to the admins in the :setting:`admins` setting."""
conf = self.conf
if conf.admins:
to = [admin_email for _, admin_email in conf.admins]
return self.loader.mail_admins(
subject, body, fail_silently, to=to,
sender=conf.server_email,
host=conf.email_host,
port=conf.email_port,
user=conf.email_host_user,
password=conf.email_host_password,
timeout=conf.email_timeout,
use_ssl=conf.email_use_ssl,
use_tls=conf.email_use_tls,
charset=conf.email_charset,
)
def select_queues(self, queues=None):
"""Select a subset of queues, where queues must be a list of queue
names to keep."""
return self.amqp.queues.select(queues)
def either(self, default_key, *values):
"""Fallback to the value of a configuration key if none of the
`*values` are true."""
return first(None, [
first(None, values), starpromise(self.conf.get, default_key),
])
def bugreport(self):
"""Return a string with information useful for the Celery core
developers when reporting a bug."""
return bugreport(self)
def _get_backend(self):
from celery.backends import get_backend_by_url
backend, url = get_backend_by_url(
self.backend_cls or self.conf.result_backend,
self.loader)
return backend(app=self, url=url)
def _load_config(self):
if isinstance(self.on_configure, Signal):
self.on_configure.send(sender=self)
else:
# used to be a method pre 4.0
self.on_configure()
if self._config_source:
self.loader.config_from_object(self._config_source)
self.configured = True
settings = detect_settings(
self.prepare_config(self.loader.conf), self._preconf,
ignore_keys=self._preconf_set_by_auto, prefix=self.namespace,
)
if self._conf is not None:
# replace in place, as someone may have referenced app.conf,
# done some changes, accessed a key, and then try to make more
# changes to the reference and not the finalized value.
self._conf.swap_with(settings)
else:
self._conf = settings
# load lazy config dict initializers.
pending_def = self._pending_defaults
while pending_def:
self._conf.add_defaults(maybe_evaluate(pending_def.popleft()()))
# load lazy periodic tasks
pending_beat = self._pending_periodic_tasks
while pending_beat:
self._add_periodic_task(*pending_beat.popleft())
self.on_after_configure.send(sender=self, source=self._conf)
return self._conf
def _after_fork(self):
self._pool = None
try:
self.__dict__['amqp']._producer_pool = None
except (AttributeError, KeyError):
pass
self.on_after_fork.send(sender=self)
def signature(self, *args, **kwargs):
"""Return a new :class:`~celery.canvas.Signature` bound to this app.
See :meth:`~celery.signature`
"""
kwargs['app'] = self
return self.canvas.signature(*args, **kwargs)
def add_periodic_task(self, schedule, sig,
args=(), kwargs=(), name=None, **opts):
key, entry = self._sig_to_periodic_task_entry(
schedule, sig, args, kwargs, name, **opts)
if self.configured:
self._add_periodic_task(key, entry)
else:
self._pending_periodic_tasks.append((key, entry))
return key
def _sig_to_periodic_task_entry(self, schedule, sig,
args=(), kwargs={}, name=None, **opts):
sig = (sig.clone(args, kwargs)
if isinstance(sig, abstract.CallableSignature)
else self.signature(sig.name, args, kwargs))
return name or repr(sig), {
'schedule': schedule,
'task': sig.name,
'args': sig.args,
'kwargs': sig.kwargs,
'options': dict(sig.options, **opts),
}
def _add_periodic_task(self, key, entry):
self._conf.beat_schedule[key] = entry
def create_task_cls(self):
"""Creates a base task class using default configuration
taken from this app."""
return self.subclass_with_self(
self.task_cls, name='Task', attribute='_app',
keep_reduce=True, abstract=True,
)
def subclass_with_self(self, Class, name=None, attribute='app',
reverse=None, keep_reduce=False, **kw):
"""Subclass an app-compatible class by setting its app attribute
to be this app instance.
App-compatible means that the class has a class attribute that
provides the default app it should use, e.g.
``class Foo: app = None``.
:param Class: The app-compatible class to subclass.
:keyword name: Custom name for the target class.
:keyword attribute: Name of the attribute holding the app,
default is 'app'.
"""
Class = symbol_by_name(Class)
reverse = reverse if reverse else Class.__name__
def __reduce__(self):
return _unpickle_appattr, (reverse, self.__reduce_args__())
attrs = dict({attribute: self}, __module__=Class.__module__,
__doc__=Class.__doc__, **kw)
if not keep_reduce:
attrs['__reduce__'] = __reduce__
return type(name or Class.__name__, (Class,), attrs)
def _rgetattr(self, path):
return attrgetter(path)(self)
def __repr__(self):
return '<{0} {1}>'.format(type(self).__name__, appstr(self))
def __reduce__(self):
if self._using_v1_reduce:
return self.__reduce_v1__()
return (_unpickle_app_v2, (self.__class__, self.__reduce_keys__()))
def __reduce_v1__(self):
# Reduce only pickles the configuration changes,
# so the default configuration doesn't have to be passed
# between processes.
return (
_unpickle_app,
(self.__class__, self.Pickler) + self.__reduce_args__(),
)
def __reduce_keys__(self):
"""Return keyword arguments used to reconstruct the object
when unpickling."""
return {
'main': self.main,
'changes':
self._conf.changes if self.configured else self._preconf,
'loader': self.loader_cls,
'backend': self.backend_cls,
'amqp': self.amqp_cls,
'events': self.events_cls,
'log': self.log_cls,
'control': self.control_cls,
'fixups': self.fixups,
'config_source': self._config_source,
'task_cls': self.task_cls,
'namespace': self.namespace,
}
def __reduce_args__(self):
"""Deprecated method, please use :meth:`__reduce_keys__` instead."""
return (self.main, self._conf.changes if self.configured else {},
self.loader_cls, self.backend_cls, self.amqp_cls,
self.events_cls, self.log_cls, self.control_cls,
False, self._config_source)
@cached_property
def Worker(self):
"""Worker application. See :class:`~@Worker`."""
return self.subclass_with_self('celery.apps.worker:Worker')
@cached_property
def WorkController(self, **kwargs):
"""Embeddable worker. See :class:`~@WorkController`."""
return self.subclass_with_self('celery.worker:WorkController')
@cached_property
def Beat(self, **kwargs):
"""Celerybeat scheduler application.
See :class:`~@Beat`.
"""
return self.subclass_with_self('celery.apps.beat:Beat')
@cached_property
def Task(self):
"""Base task class for this app."""
return self.create_task_cls()
@cached_property
def annotations(self):
return prepare_annotations(self.conf.task_annotations)
@cached_property
def AsyncResult(self):
"""Create new result instance.
See :class:`celery.result.AsyncResult`.
"""
return self.subclass_with_self('celery.result:AsyncResult')
@cached_property
def ResultSet(self):
return self.subclass_with_self('celery.result:ResultSet')
@cached_property
def GroupResult(self):
"""Create new group result instance.
See :class:`celery.result.GroupResult`.
"""
return self.subclass_with_self('celery.result:GroupResult')
@property
def pool(self):
"""Broker connection pool: :class:`~@pool`.
This attribute is not related to the workers concurrency pool.
"""
if self._pool is None:
self._ensure_after_fork()
limit = self.conf.broker_pool_limit
pools.set_limit(limit)
self._pool = pools.connections[self.connection_for_write()]
return self._pool
@property
def current_task(self):
"""The instance of the task that is being executed, or
:const:`None`."""
return _task_stack.top
@property
def current_worker_task(self):
return get_current_worker_task()
@cached_property
def oid(self):
return oid_from(self)
@cached_property
def amqp(self):
"""AMQP related functionality: :class:`~@amqp`."""
return instantiate(self.amqp_cls, app=self)
@cached_property
def backend(self):
"""Current backend instance."""
return self._get_backend()
@property
def conf(self):
"""Current configuration."""
if self._conf is None:
self._conf = self._load_config()
return self._conf
def _get_from_conf_and_finalize(self, key):
conf = self._conf = self._load_config()
return conf[key]
@conf.setter
def conf(self, d): # noqa
self._conf = d
@cached_property
def control(self):
"""Remote control: :class:`~@control`."""
return instantiate(self.control_cls, app=self)
@cached_property
def events(self):
"""Consuming and sending events: :class:`~@events`."""
return instantiate(self.events_cls, app=self)
@cached_property
def loader(self):
"""Current loader instance."""
return get_loader_cls(self.loader_cls)(app=self)
@cached_property
def log(self):
"""Logging: :class:`~@log`."""
return instantiate(self.log_cls, app=self)
@cached_property
def canvas(self):
from celery import canvas
return canvas
@cached_property
def tasks(self):
"""Task registry.
Accessing this attribute will also finalize the app.
"""
self.finalize(auto=True)
return self._tasks
@cached_property
def timezone(self):
"""Current timezone for this app.
This is a cached property taking the time zone from the
:setting:`timezone` setting.
"""
from celery.utils.timeutils import timezone
conf = self.conf
tz = conf.timezone
if not tz:
return (timezone.get_timezone('UTC') if conf.enable_utc
else timezone.local)
return timezone.get_timezone(conf.timezone)
'beat_init',
'beat_embedded_init',
'heartbeat_sent',
'eventlet_pool_started',
'eventlet_pool_preshutdown',
'eventlet_pool_postshutdown',
'eventlet_pool_apply',
)
# - Task
before_task_publish = Signal(
name='before_task_publish',
providing_args={
'body',
'exchange',
'routing_key',
'headers',
'properties',
'declare',
'retry_policy',
},
)
after_task_publish = Signal(
name='after_task_publish',
providing_args={'body', 'exchange', 'routing_key'},
)
task_prerun = Signal(
name='task_prerun',
providing_args={'task_id', 'task', 'args', 'kwargs'},
)
task_postrun = Signal(
name='task_postrun',
broker=config.CATALOG_BROKER_URL)
# Use configuration provided by user
app.config_from_object(config)
# And set some technical stuff that the user shouldn't be allowed to touch
app.conf.update(
CELERY_TASK_SERIALIZER='json',
CELERY_ACCEPT_CONTENT=['json'],
CELERY_RESULT_SERIALIZER='json',
CELERY_RESULT_BACKEND='amqp',
CELERY_TASK_RESULT_EXPIRES=30,
CELERY_TASK_RESULT_DURABLE=False,
)
on_create_work = Signal(providing_args=('timestamp', 'user_uri', 'work_uri',
'work_data'))
on_update_work = Signal(providing_args=('timestamp', 'user_uri', 'work_uri',
'work_data'))
on_delete_work = Signal(providing_args=('timestamp', 'user_uri', 'work_uri'))
on_create_work_source = Signal(providing_args=('timestamp', 'user_uri',
'work_uri', 'source_uri',
'source_data'))
on_create_stock_source = Signal(providing_args=('timestamp', 'user_uri',
'source_uri', 'source_data'))
on_update_source = Signal(providing_args=('timestamp', 'user_uri',
'source_uri', 'source_data'))
on_delete_source = Signal(providing_args=('timestamp', 'user_uri',
'source_uri'))
on_create_post = Signal(providing_args=('timestamp', 'user_uri', 'work_uri',
'post_uri', 'post_data'))
on_update_post = Signal(providing_args=('timestamp', 'user_uri', 'post_uri',
"""Definitions of custom :doc:`Celery signals <celery:userguide/signals>`
related to emails.
These signals allow us to keep the VOEvent validation code decoupled from the
email client itself.
"""
from celery.utils.dispatch import Signal
email_received = Signal(name='email_received', providing_args=('rfc822', ))
"""Fired whenever an email message is received.
Parameters
----------
rfc822 : bytes
The :rfc:`822` contents of the message.
Examples
--------
Register an email listener like this::
import email
import email.policy
@email_received.connect
def on_email_received(rfc822, **kwargs):
# Parse the RFC822 email.
message = email.message_from_bytes(rfc822, policy=email.policy.default)
# Print some of the message headers.
print('Subject:', message['Subject'])
print('From:', message['From'])
"""Definitions of custom :doc:`Celery signals <celery:userguide/signals>`
related to VOEvents.
These signals allow us to keep the VOEvent broker code decoupled from any
GCN-specific logic. Notably, it allows us to keep all of the details of
the GCN-specific "Notice Type" concept out of :mod:`gwcelery.voevent`.
"""
from celery.utils.dispatch import Signal
voevent_received = Signal(name='voevent_received',
providing_args=('xml_document', ))
"""Fired whenever a VOEvent is received.
Parameters
----------
xml_document : :class:`comet.utility.xml.xml_document`
The XML document that was received. The raw file contents are available as
``xml_document.raw_bytes``. The ``lxml.etree`` representation of the
document is available as ``xml_document.element``.
"""
import logging
import requests
from celery import task
from celery.signals import celeryd_init
from celery.utils.dispatch import Signal
from .models import SensorManager
from .constants import SENSOR_DATA_URI, WEATHER_DATA_URI, EXTERNAL_API_TIMEOUT
sensor_fetched = Signal(providing_args=['sensor_id', 'timestamp', 'value'])
weather_fetched = Signal(providing_args=['temperature'])
def write_sensor_event(sender, sensor_id: str, timestamp: int, value: float,
*args, **kwargs):
SensorManager.write_sensor_event(sensor_id, timestamp, value)
def update_statistics(sender, sensor_id: str, timestamp, value: float, *args,
**kwargs):
SensorManager.update_sensor_statistics(sensor_id, value)
def update_helsinki_temperature(sender, temperature: float, *args, **kwargs):
SensorManager.update_helsinki_temperature(temperature)
@celeryd_init.connect
def init_signals(*args, **kwargs):
sensor_fetched.connect(write_sensor_event,
class Polaroid:
"""Record event snapshots."""
timer = None
shutter_signal = Signal(name='shutter_signal', providing_args={'state'})
cleanup_signal = Signal(name='cleanup_signal')
clear_after = False
_tref = None
_ctref = None
def __init__(self,
state,
freq=1.0,
maxrate=None,
cleanup_freq=3600.0,
timer=None,
app=None):
self.app = app_or_default(app)
self.state = state
self.freq = freq
self.cleanup_freq = cleanup_freq
self.timer = timer or self.timer or Timer()
self.logger = logger
self.maxrate = maxrate and TokenBucket(rate(maxrate))
def install(self):
self._tref = self.timer.call_repeatedly(self.freq, self.capture)
self._ctref = self.timer.call_repeatedly(
self.cleanup_freq,
self.cleanup,
)
def on_shutter(self, state):
pass
def on_cleanup(self):
pass
def cleanup(self):
logger.debug('Cleanup: Running...')
self.cleanup_signal.send(sender=self.state)
self.on_cleanup()
def shutter(self):
if self.maxrate is None or self.maxrate.can_consume():
logger.debug('Shutter: %s', self.state)
self.shutter_signal.send(sender=self.state)
self.on_shutter(self.state)
def capture(self):
self.state.freeze_while(self.shutter, clear_after=self.clear_after)
def cancel(self):
if self._tref:
self._tref() # flush all received events.
self._tref.cancel()
if self._ctref:
self._ctref.cancel()
def __enter__(self):
self.install()
return self
def __exit__(self, *exc_info):
self.cancel()
"""Embedded workers for integration tests."""
from __future__ import absolute_import, unicode_literals
import os
import threading
from contextlib import contextmanager
from celery import worker
from celery.result import allow_join_result, _set_task_join_will_block
from celery.utils.dispatch import Signal
from celery.utils.nodenames import anon_nodename
WORKER_LOGLEVEL = os.environ.get('WORKER_LOGLEVEL', 'error')
test_worker_starting = Signal(
name='test_worker_starting',
providing_args={},
)
test_worker_started = Signal(
name='test_worker_started',
providing_args={'worker', 'consumer'},
)
test_worker_stopped = Signal(
name='test_worker_stopped',
providing_args={'worker'},
)
class TestWorkController(worker.WorkController):
"""Worker that can synchronize on being fully started."""
def __init__(self, *args, **kwargs):
# type: (*Any, **Any) -> None
self._on_started = threading.Event()
The level of the logging object.
* logfile
The name of the logfile.
* format
The log format string.
* colorize
Specify if log messages are colored or not.
"""
from celery.utils.dispatch import Signal
task_sent = Signal(
providing_args=["task_id", "task", "args", "kwargs", "eta", "taskset"])
task_prerun = Signal(providing_args=["task_id", "task", "args", "kwargs"])
task_postrun = Signal(
providing_args=["task_id", "task", "args", "kwargs", "retval"])
task_failure = Signal(providing_args=[
"task_id", "exception", "args", "kwargs", "traceback", "einfo"
])
worker_init = Signal(providing_args=[])
worker_process_init = Signal(providing_args=[])
worker_ready = Signal(providing_args=[])
worker_shutdown = Signal(providing_args=[])
"""Definitions of custom :doc:`Celery signals <celery:userguide/signals>`
related to VOEvents.
These signals allow us to keep the VOEvent broker code decoupled from any
GCN-specific logic. Notably, it allows us to keep all of the details of
the GCN-specific "Notice Type" concept out of :mod:`gwcelery.voevent`.
"""
from celery.utils.dispatch import Signal
lvalert_received = Signal(name='lvalert_received',
providing_args=('node', 'payload'))
"""Fired whenever a VOEvent is received.
Parameters
----------
xml_document : :class:`comet.utility.xml.xml_document`
The XML document that was received. The raw file contents are available as
``xml_document.raw_bytes``. The ``lxml.etree`` representation of the
document is available as ``xml_document.element``.
"""
"""Embedded workers for integration tests."""
from __future__ import absolute_import, unicode_literals
import os
import threading
from contextlib import contextmanager
from celery import worker
from celery.result import _set_task_join_will_block, allow_join_result
from celery.utils.dispatch import Signal
from celery.utils.nodenames import anon_nodename
WORKER_LOGLEVEL = os.environ.get("WORKER_LOGLEVEL", "error")
test_worker_starting = Signal(
name="test_worker_starting",
providing_args={},
)
test_worker_started = Signal(
name="test_worker_started",
providing_args={"worker", "consumer"},
)
test_worker_stopped = Signal(
name="test_worker_stopped",
providing_args={"worker"},
)
class TestWorkController(worker.WorkController):
"""Worker that can synchronize on being fully started."""
def __init__(self, *args, **kwargs):
def __init__(
self,
main=None,
loader=None,
backend=None,
amqp=None,
events=None,
log=None,
control=None,
set_as_current=True,
tasks=None,
broker=None,
include=None,
changes=None,
config_source=None,
fixups=None,
task_cls=None,
autofinalize=True,
**kwargs
):
self.clock = LamportClock()
self.main = main
self.amqp_cls = amqp or self.amqp_cls
self.events_cls = events or self.events_cls
self.loader_cls = loader or self.loader_cls
self.log_cls = log or self.log_cls
self.control_cls = control or self.control_cls
self.task_cls = task_cls or self.task_cls
self.set_as_current = set_as_current
self.registry_cls = symbol_by_name(self.registry_cls)
self.user_options = defaultdict(set)
self.steps = defaultdict(set)
self.autofinalize = autofinalize
self.configured = False
self._config_source = config_source
self._pending_defaults = deque()
self._pending_periodic_tasks = deque()
self.finalized = False
self._finalize_mutex = threading.Lock()
self._pending = deque()
self._tasks = tasks
if not isinstance(self._tasks, TaskRegistry):
self._tasks = TaskRegistry(self._tasks or {})
# If the class defins a custom __reduce_args__ we need to use
# the old way of pickling apps, which is pickling a list of
# args instead of the new way that pickles a dict of keywords.
self._using_v1_reduce = app_has_custom(self, "__reduce_args__")
# these options are moved to the config to
# simplify pickling of the app object.
self._preconf = changes or {}
if broker:
self._preconf["BROKER_URL"] = broker
if backend:
self._preconf["CELERY_RESULT_BACKEND"] = backend
if include:
self._preconf["CELERY_IMPORTS"] = include
# - Apply fixups.
self.fixups = set(self.builtin_fixups) if fixups is None else fixups
# ...store fixup instances in _fixups to keep weakrefs alive.
self._fixups = [symbol_by_name(fixup)(self) for fixup in self.fixups]
if self.set_as_current:
self.set_current()
# Signals
if self.on_configure is None:
# used to be a method pre 3.2
self.on_configure = Signal()
self.on_after_configure = Signal()
self.on_after_finalize = Signal()
self.on_init()
_register_app(self)
from celery.utils.dispatch import Signal
subtask_success = Signal(
name='subtask_success',
providing_args=['root_id', 'task_id', 'retval'],
)
class Celery(object):
"""Celery application.
Arguments:
main (str): Name of the main module if running as `__main__`.
This is used as the prefix for auto-generated task names.
Keyword Arguments:
broker (str): URL of the default broker used.
backend (Union[str, Type[celery.backends.base.Backend]]):
The result store backend class, or the name of the backend
class to use.
Default is the value of the :setting:`result_backend` setting.
autofinalize (bool): If set to False a :exc:`RuntimeError`
will be raised if the task registry or tasks are used before
the app is finalized.
set_as_current (bool): Make this the global current app.
include (List[str]): List of modules every worker should import.
amqp (Union[str, Type[AMQP]]): AMQP object or class name.
events (Union[str, Type[celery.app.events.Events]]): Events object or
class name.
log (Union[str, Type[Logging]]): Log object or class name.
control (Union[str, Type[celery.app.control.Control]]): Control object
or class name.
tasks (Union[str, Type[TaskRegistry]]): A task registry, or the name of
a registry class.
fixups (List[str]): List of fix-up plug-ins (e.g., see
:mod:`celery.fixups.django`).
config_source (Union[str, class]): Take configuration from a class,
or object. Attributes may include any settings described in
the documentation.
"""
#: This is deprecated, use :meth:`reduce_keys` instead
Pickler = AppPickler
SYSTEM = platforms.SYSTEM
IS_macOS, IS_WINDOWS = platforms.IS_macOS, platforms.IS_WINDOWS
#: Name of the `__main__` module. Required for standalone scripts.
#:
#: If set this will be used instead of `__main__` when automatically
#: generating task names.
main = None
#: Custom options for command-line programs.
#: See :ref:`extending-commandoptions`
user_options = None
#: Custom bootsteps to extend and modify the worker.
#: See :ref:`extending-bootsteps`.
steps = None
builtin_fixups = BUILTIN_FIXUPS
amqp_cls = 'celery.app.amqp:AMQP'
backend_cls = None
events_cls = 'celery.app.events:Events'
loader_cls = None
log_cls = 'celery.app.log:Logging'
control_cls = 'celery.app.control:Control'
task_cls = 'celery.app.task:Task'
registry_cls = 'celery.app.registry:TaskRegistry'
_fixups = None
_pool = None
_conf = None
_after_fork_registered = False
#: Signal sent when app is loading configuration.
on_configure = None
#: Signal sent after app has prepared the configuration.
on_after_configure = None
#: Signal sent after app has been finalized.
on_after_finalize = None
#: Signal sent by every new process after fork.
on_after_fork = None
def __init__(self,
main=None,
loader=None,
backend=None,
amqp=None,
events=None,
log=None,
control=None,
set_as_current=True,
tasks=None,
broker=None,
include=None,
changes=None,
config_source=None,
fixups=None,
task_cls=None,
autofinalize=True,
namespace=None,
strict_typing=True,
**kwargs):
self.clock = LamportClock()
self.main = main
self.amqp_cls = amqp or self.amqp_cls
self.events_cls = events or self.events_cls
self.loader_cls = loader or self._get_default_loader()
self.log_cls = log or self.log_cls
self.control_cls = control or self.control_cls
self.task_cls = task_cls or self.task_cls
self.set_as_current = set_as_current
self.registry_cls = symbol_by_name(self.registry_cls)
self.user_options = defaultdict(set)
self.steps = defaultdict(set)
self.autofinalize = autofinalize
self.namespace = namespace
self.strict_typing = strict_typing
self.configured = False
self._config_source = config_source
self._pending_defaults = deque()
self._pending_periodic_tasks = deque()
self.finalized = False
self._finalize_mutex = threading.Lock()
self._pending = deque()
self._tasks = tasks
if not isinstance(self._tasks, TaskRegistry):
self._tasks = self.registry_cls(self._tasks or {})
# If the class defines a custom __reduce_args__ we need to use
# the old way of pickling apps: pickling a list of
# args instead of the new way that pickles a dict of keywords.
self._using_v1_reduce = app_has_custom(self, '__reduce_args__')
# these options are moved to the config to
# simplify pickling of the app object.
self._preconf = changes or {}
self._preconf_set_by_auto = set()
self.__autoset('broker_url', broker)
self.__autoset('result_backend', backend)
self.__autoset('include', include)
self._conf = Settings(
PendingConfiguration(self._preconf, self._finalize_pending_conf),
prefix=self.namespace,
keys=(_old_key_to_new, _new_key_to_old),
)
# - Apply fix-ups.
self.fixups = set(self.builtin_fixups) if fixups is None else fixups
# ...store fixup instances in _fixups to keep weakrefs alive.
self._fixups = [symbol_by_name(fixup)(self) for fixup in self.fixups]
if self.set_as_current:
self.set_current()
# Signals
if self.on_configure is None:
# used to be a method pre 4.0
self.on_configure = Signal(name='app.on_configure')
self.on_after_configure = Signal(
name='app.on_after_configure',
providing_args={'source'},
)
self.on_after_finalize = Signal(name='app.on_after_finalize')
self.on_after_fork = Signal(name='app.on_after_fork')
self.on_init()
_register_app(self)
def _get_default_loader(self):
# the --loader command-line argument sets the environment variable.
return (os.environ.get('CELERY_LOADER') or self.loader_cls
or 'celery.loaders.app:AppLoader')
def on_init(self):
"""Optional callback called at init."""
def __autoset(self, key, value):
if value:
self._preconf[key] = value
self._preconf_set_by_auto.add(key)
def set_current(self):
"""Make this the current app for this thread."""
_set_current_app(self)
def set_default(self):
"""Make this the default app for all threads."""
set_default_app(self)
def _ensure_after_fork(self):
if not self._after_fork_registered:
self._after_fork_registered = True
if register_after_fork is not None:
register_after_fork(self, _after_fork_cleanup_app)
def close(self):
"""Clean up after the application.
Only necessary for dynamically created apps, and you should
probably use the :keyword:`with` statement instead.
Example:
>>> with Celery(set_as_current=False) as app:
... with app.connection_for_write() as conn:
... pass
"""
self._pool = None
_deregister_app(self)
def start(self, argv=None):
"""Run :program:`celery` using `argv`.
Uses :data:`sys.argv` if `argv` is not specified.
"""
return instantiate('celery.bin.celery:CeleryCommand',
app=self).execute_from_commandline(argv)
def worker_main(self, argv=None):
"""Run :program:`celery worker` using `argv`.
Uses :data:`sys.argv` if `argv` is not specified.
"""
return instantiate('celery.bin.worker:worker',
app=self).execute_from_commandline(argv)
def task(self, *args, **opts):
"""Decorator to create a task class out of any callable.
Examples:
.. code-block:: python
@app.task
def refresh_feed(url):
store_feed(feedparser.parse(url))
with setting extra options:
.. code-block:: python
@app.task(exchange='feeds')
def refresh_feed(url):
return store_feed(feedparser.parse(url))
Note:
App Binding: For custom apps the task decorator will return
a proxy object, so that the act of creating the task is not
performed until the task is used or the task registry is accessed.
If you're depending on binding to be deferred, then you must
not access any attributes on the returned object until the
application is fully set up (finalized).
"""
if USING_EXECV and opts.get('lazy', True):
# When using execv the task in the original module will point to a
# different app, so doing things like 'add.request' will point to
# a different task instance. This makes sure it will always use
# the task instance from the current app.
# Really need a better solution for this :(
from . import shared_task
return shared_task(*args, lazy=False, **opts)
def inner_create_task_cls(shared=True, filter=None, lazy=True, **opts):
_filt = filter
def _create_task_cls(fun):
if shared:
def cons(app):
return app._task_from_fun(fun, **opts)
cons.__name__ = fun.__name__
connect_on_app_finalize(cons)
if not lazy or self.finalized:
ret = self._task_from_fun(fun, **opts)
else:
# return a proxy object that evaluates on first use
ret = PromiseProxy(self._task_from_fun, (fun, ),
opts,
__doc__=fun.__doc__)
self._pending.append(ret)
if _filt:
return _filt(ret)
return ret
return _create_task_cls
if len(args) == 1:
if callable(args[0]):
return inner_create_task_cls(**opts)(*args)
raise TypeError('argument 1 to @task() must be a callable')
if args:
raise TypeError(
'@task() takes exactly 1 argument ({0} given)'.format(
sum([len(args), len(opts)])))
return inner_create_task_cls(**opts)
def _task_from_fun(self, fun, name=None, base=None, bind=False, **options):
if not self.finalized and not self.autofinalize:
raise RuntimeError('Contract breach: app not finalized')
name = name or self.gen_task_name(fun.__name__, fun.__module__)
base = base or self.Task
if name not in self._tasks:
run = fun if bind else staticmethod(fun)
task = type(
fun.__name__, (base, ),
dict(
{
'app': self,
'name': name,
'run': run,
'_decorated': True,
'__doc__': fun.__doc__,
'__module__': fun.__module__,
'__header__': staticmethod(
head_from_fun(fun, bound=bind)),
'__wrapped__': run
}, **options))()
# for some reason __qualname__ cannot be set in type()
# so we have to set it here.
try:
task.__qualname__ = fun.__qualname__
except AttributeError:
pass
self._tasks[task.name] = task
task.bind(self) # connects task to this app
autoretry_for = tuple(options.get('autoretry_for', ()))
retry_kwargs = options.get('retry_kwargs', {})
retry_backoff = int(options.get('retry_backoff', False))
retry_backoff_max = int(options.get('retry_backoff_max', 600))
retry_jitter = options.get('retry_jitter', True)
if autoretry_for and not hasattr(task, '_orig_run'):
@wraps(task.run)
def run(*args, **kwargs):
try:
return task._orig_run(*args, **kwargs)
except autoretry_for as exc:
if retry_backoff:
retry_kwargs['countdown'] = \
get_exponential_backoff_interval(
factor=retry_backoff,
retries=task.request.retries,
maximum=retry_backoff_max,
full_jitter=retry_jitter)
raise task.retry(exc=exc, **retry_kwargs)
task._orig_run, task.run = task.run, run
else:
task = self._tasks[name]
return task
def register_task(self, task):
"""Utility for registering a task-based class.
Note:
This is here for compatibility with old Celery 1.0
style task classes, you should not need to use this for
new projects.
"""
if not task.name:
task_cls = type(task)
task.name = self.gen_task_name(task_cls.__name__,
task_cls.__module__)
self.tasks[task.name] = task
task._app = self
task.bind(self)
return task
def gen_task_name(self, name, module):
return gen_task_name(self, name, module)
def finalize(self, auto=False):
"""Finalize the app.
This loads built-in tasks, evaluates pending task decorators,
reads configuration, etc.
"""
with self._finalize_mutex:
if not self.finalized:
if auto and not self.autofinalize:
raise RuntimeError('Contract breach: app not finalized')
self.finalized = True
_announce_app_finalized(self)
pending = self._pending
while pending:
maybe_evaluate(pending.popleft())
for task in values(self._tasks):
task.bind(self)
self.on_after_finalize.send(sender=self)
def add_defaults(self, fun):
"""Add default configuration from dict ``d``.
If the argument is a callable function then it will be regarded
as a promise, and it won't be loaded until the configuration is
actually needed.
This method can be compared to:
.. code-block:: pycon
>>> celery.conf.update(d)
with a difference that 1) no copy will be made and 2) the dict will
not be transferred when the worker spawns child processes, so
it's important that the same configuration happens at import time
when pickle restores the object on the other side.
"""
if not callable(fun):
d, fun = fun, lambda: d
if self.configured:
return self._conf.add_defaults(fun())
self._pending_defaults.append(fun)
def config_from_object(self,
obj,
silent=False,
force=False,
namespace=None):
"""Read configuration from object.
Object is either an actual object or the name of a module to import.
Example:
>>> celery.config_from_object('myapp.celeryconfig')
>>> from myapp import celeryconfig
>>> celery.config_from_object(celeryconfig)
Arguments:
silent (bool): If true then import errors will be ignored.
force (bool): Force reading configuration immediately.
By default the configuration will be read only when required.
"""
self._config_source = obj
self.namespace = namespace or self.namespace
if force or self.configured:
self._conf = None
if self.loader.config_from_object(obj, silent=silent):
return self.conf
def config_from_envvar(self, variable_name, silent=False, force=False):
"""Read configuration from environment variable.
The value of the environment variable must be the name
of a module to import.
Example:
>>> os.environ['CELERY_CONFIG_MODULE'] = 'myapp.celeryconfig'
>>> celery.config_from_envvar('CELERY_CONFIG_MODULE')
"""
module_name = os.environ.get(variable_name)
if not module_name:
if silent:
return False
raise ImproperlyConfigured(
ERR_ENVVAR_NOT_SET.strip().format(variable_name))
return self.config_from_object(module_name, silent=silent, force=force)
def config_from_cmdline(self, argv, namespace='celery'):
self._conf.update(self.loader.cmdline_config_parser(argv, namespace))
def setup_security(self,
allowed_serializers=None,
key=None,
cert=None,
store=None,
digest='sha1',
serializer='json'):
"""Setup the message-signing serializer.
This will affect all application instances (a global operation).
Disables untrusted serializers and if configured to use the ``auth``
serializer will register the ``auth`` serializer with the provided
settings into the Kombu serializer registry.
Arguments:
allowed_serializers (Set[str]): List of serializer names, or
content_types that should be exempt from being disabled.
key (str): Name of private key file to use.
Defaults to the :setting:`security_key` setting.
cert (str): Name of certificate file to use.
Defaults to the :setting:`security_certificate` setting.
store (str): Directory containing certificates.
Defaults to the :setting:`security_cert_store` setting.
digest (str): Digest algorithm used when signing messages.
Default is ``sha1``.
serializer (str): Serializer used to encode messages after
they've been signed. See :setting:`task_serializer` for
the serializers supported. Default is ``json``.
"""
from celery.security import setup_security
return setup_security(allowed_serializers,
key,
cert,
store,
digest,
serializer,
app=self)
def autodiscover_tasks(self,
packages=None,
related_name='tasks',
force=False):
"""Auto-discover task modules.
Searches a list of packages for a "tasks.py" module (or use
related_name argument).
If the name is empty, this will be delegated to fix-ups (e.g., Django).
For example if you have a directory layout like this:
.. code-block:: text
foo/__init__.py
tasks.py
models.py
bar/__init__.py
tasks.py
models.py
baz/__init__.py
models.py
Then calling ``app.autodiscover_tasks(['foo', 'bar', 'baz'])`` will
result in the modules ``foo.tasks`` and ``bar.tasks`` being imported.
Arguments:
packages (List[str]): List of packages to search.
This argument may also be a callable, in which case the
value returned is used (for lazy evaluation).
related_name (str): The name of the module to find. Defaults
to "tasks": meaning "look for 'module.tasks' for every
module in ``packages``.". If ``None`` will only try to import
the package, i.e. "look for 'module'".
force (bool): By default this call is lazy so that the actual
auto-discovery won't happen until an application imports
the default modules. Forcing will cause the auto-discovery
to happen immediately.
"""
if force:
return self._autodiscover_tasks(packages, related_name)
signals.import_modules.connect(starpromise(
self._autodiscover_tasks,
packages,
related_name,
),
weak=False,
sender=self)
def _autodiscover_tasks(self, packages, related_name, **kwargs):
if packages:
return self._autodiscover_tasks_from_names(packages, related_name)
return self._autodiscover_tasks_from_fixups(related_name)
def _autodiscover_tasks_from_names(self, packages, related_name):
# packages argument can be lazy
return self.loader.autodiscover_tasks(
packages() if callable(packages) else packages,
related_name,
)
def _autodiscover_tasks_from_fixups(self, related_name):
return self._autodiscover_tasks_from_names([
pkg for fixup in self._fixups
for pkg in fixup.autodiscover_tasks()
if hasattr(fixup, 'autodiscover_tasks')
],
related_name=related_name)
def send_task(self,
name,
args=None,
kwargs=None,
countdown=None,
eta=None,
task_id=None,
producer=None,
connection=None,
router=None,
result_cls=None,
expires=None,
publisher=None,
link=None,
link_error=None,
add_to_parent=True,
group_id=None,
retries=0,
chord=None,
reply_to=None,
time_limit=None,
soft_time_limit=None,
root_id=None,
parent_id=None,
route_name=None,
shadow=None,
chain=None,
task_type=None,
**options):
"""Send task by name.
Supports the same arguments as :meth:`@-Task.apply_async`.
Arguments:
name (str): Name of task to call (e.g., `"tasks.add"`).
result_cls (AsyncResult): Specify custom result class.
"""
parent = have_parent = None
amqp = self.amqp
task_id = task_id or uuid()
producer = producer or publisher # XXX compat
router = router or amqp.router
conf = self.conf
if conf.task_always_eager: # pragma: no cover
warnings.warn(AlwaysEagerIgnored(
'task_always_eager has no effect on send_task', ),
stacklevel=2)
ignored_result = options.pop('ignore_result', False)
options = router.route(options, route_name or name, args, kwargs,
task_type)
if not root_id or not parent_id:
parent = self.current_worker_task
if parent:
if not root_id:
root_id = parent.request.root_id or parent.request.id
if not parent_id:
parent_id = parent.request.id
message = amqp.create_task_message(
task_id,
name,
args,
kwargs,
countdown,
eta,
group_id,
expires,
retries,
chord,
maybe_list(link),
maybe_list(link_error),
reply_to or self.oid,
time_limit,
soft_time_limit,
self.conf.task_send_sent_event,
root_id,
parent_id,
shadow,
chain,
argsrepr=options.get('argsrepr'),
kwargsrepr=options.get('kwargsrepr'),
)
if connection:
producer = amqp.Producer(connection, auto_declare=False)
with self.producer_or_acquire(producer) as P:
with P.connection._reraise_as_library_errors():
if not ignored_result:
self.backend.on_task_call(P, task_id)
amqp.send_task_message(P, name, message, **options)
result = (result_cls or self.AsyncResult)(task_id)
# We avoid using the constructor since a custom result class
# can be used, in which case the constructor may still use
# the old signature.
result.ignored = ignored_result
if add_to_parent:
if not have_parent:
parent, have_parent = self.current_worker_task, True
if parent:
parent.add_trail(result)
return result
def connection_for_read(self, url=None, **kwargs):
"""Establish connection used for consuming.
See Also:
:meth:`connection` for supported arguments.
"""
return self._connection(url or self.conf.broker_read_url, **kwargs)
def connection_for_write(self, url=None, **kwargs):
"""Establish connection used for producing.
See Also:
:meth:`connection` for supported arguments.
"""
return self._connection(url or self.conf.broker_write_url, **kwargs)
def connection(self,
hostname=None,
userid=None,
password=None,
virtual_host=None,
port=None,
ssl=None,
connect_timeout=None,
transport=None,
transport_options=None,
heartbeat=None,
login_method=None,
failover_strategy=None,
**kwargs):
"""Establish a connection to the message broker.
Please use :meth:`connection_for_read` and
:meth:`connection_for_write` instead, to convey the intent
of use for this connection.
Arguments:
url: Either the URL or the hostname of the broker to use.
hostname (str): URL, Hostname/IP-address of the broker.
If a URL is used, then the other argument below will
be taken from the URL instead.
userid (str): Username to authenticate as.
password (str): Password to authenticate with
virtual_host (str): Virtual host to use (domain).
port (int): Port to connect to.
ssl (bool, Dict): Defaults to the :setting:`broker_use_ssl`
setting.
transport (str): defaults to the :setting:`broker_transport`
setting.
transport_options (Dict): Dictionary of transport specific options.
heartbeat (int): AMQP Heartbeat in seconds (``pyamqp`` only).
login_method (str): Custom login method to use (AMQP only).
failover_strategy (str, Callable): Custom failover strategy.
**kwargs: Additional arguments to :class:`kombu.Connection`.
Returns:
kombu.Connection: the lazy connection instance.
"""
return self.connection_for_write(hostname
or self.conf.broker_write_url,
userid=userid,
password=password,
virtual_host=virtual_host,
port=port,
ssl=ssl,
connect_timeout=connect_timeout,
transport=transport,
transport_options=transport_options,
heartbeat=heartbeat,
login_method=login_method,
failover_strategy=failover_strategy,
**kwargs)
def _connection(self,
url,
userid=None,
password=None,
virtual_host=None,
port=None,
ssl=None,
connect_timeout=None,
transport=None,
transport_options=None,
heartbeat=None,
login_method=None,
failover_strategy=None,
**kwargs):
conf = self.conf
return self.amqp.Connection(
url,
userid or conf.broker_user,
password or conf.broker_password,
virtual_host or conf.broker_vhost,
port or conf.broker_port,
transport=transport or conf.broker_transport,
ssl=self.either('broker_use_ssl', ssl),
heartbeat=heartbeat or self.conf.broker_heartbeat,
login_method=login_method or conf.broker_login_method,
failover_strategy=(failover_strategy
or conf.broker_failover_strategy),
transport_options=dict(conf.broker_transport_options,
**transport_options or {}),
connect_timeout=self.either('broker_connection_timeout',
connect_timeout),
)
broker_connection = connection
def _acquire_connection(self, pool=True):
"""Helper for :meth:`connection_or_acquire`."""
if pool:
return self.pool.acquire(block=True)
return self.connection_for_write()
def connection_or_acquire(self, connection=None, pool=True, *_, **__):
"""Context used to acquire a connection from the pool.
For use within a :keyword:`with` statement to get a connection
from the pool if one is not already provided.
Arguments:
connection (kombu.Connection): If not provided, a connection
will be acquired from the connection pool.
"""
return FallbackContext(connection, self._acquire_connection, pool=pool)
default_connection = connection_or_acquire # XXX compat
def producer_or_acquire(self, producer=None):
"""Context used to acquire a producer from the pool.
For use within a :keyword:`with` statement to get a producer
from the pool if one is not already provided
Arguments:
producer (kombu.Producer): If not provided, a producer
will be acquired from the producer pool.
"""
return FallbackContext(
producer,
self.producer_pool.acquire,
block=True,
)
default_producer = producer_or_acquire # XXX compat
def prepare_config(self, c):
"""Prepare configuration before it is merged with the defaults."""
return find_deprecated_settings(c)
def now(self):
"""Return the current time and date as a datetime."""
now_in_utc = to_utc(datetime.utcnow())
return now_in_utc.astimezone(self.timezone)
def select_queues(self, queues=None):
"""Select subset of queues.
Arguments:
queues (Sequence[str]): a list of queue names to keep.
"""
return self.amqp.queues.select(queues)
def either(self, default_key, *defaults):
"""Get key from configuration or use default values.
Fallback to the value of a configuration key if none of the
`*values` are true.
"""
return first(None, [
first(None, defaults),
starpromise(self.conf.get, default_key),
])
def bugreport(self):
"""Return information useful in bug reports."""
return bugreport(self)
def _get_backend(self):
backend, url = backends.by_url(
self.backend_cls or self.conf.result_backend, self.loader)
return backend(app=self, url=url)
def _finalize_pending_conf(self):
"""Get config value by key and finalize loading the configuration.
Note:
This is used by PendingConfiguration:
as soon as you access a key the configuration is read.
"""
conf = self._conf = self._load_config()
return conf
def _load_config(self):
if isinstance(self.on_configure, Signal):
self.on_configure.send(sender=self)
else:
# used to be a method pre 4.0
self.on_configure()
if self._config_source:
self.loader.config_from_object(self._config_source)
self.configured = True
settings = detect_settings(
self.prepare_config(self.loader.conf),
self._preconf,
ignore_keys=self._preconf_set_by_auto,
prefix=self.namespace,
)
if self._conf is not None:
# replace in place, as someone may have referenced app.conf,
# done some changes, accessed a key, and then try to make more
# changes to the reference and not the finalized value.
self._conf.swap_with(settings)
else:
self._conf = settings
# load lazy config dict initializers.
pending_def = self._pending_defaults
while pending_def:
self._conf.add_defaults(maybe_evaluate(pending_def.popleft()()))
# load lazy periodic tasks
pending_beat = self._pending_periodic_tasks
while pending_beat:
self._add_periodic_task(*pending_beat.popleft())
self.on_after_configure.send(sender=self, source=self._conf)
return self._conf
def _after_fork(self):
self._pool = None
try:
self.__dict__['amqp']._producer_pool = None
except (AttributeError, KeyError):
pass
self.on_after_fork.send(sender=self)
def signature(self, *args, **kwargs):
"""Return a new :class:`~celery.Signature` bound to this app."""
kwargs['app'] = self
return self._canvas.signature(*args, **kwargs)
def add_periodic_task(self,
schedule,
sig,
args=(),
kwargs=(),
name=None,
**opts):
key, entry = self._sig_to_periodic_task_entry(schedule, sig, args,
kwargs, name, **opts)
if self.configured:
self._add_periodic_task(key, entry)
else:
self._pending_periodic_tasks.append((key, entry))
return key
def _sig_to_periodic_task_entry(self,
schedule,
sig,
args=(),
kwargs={},
name=None,
**opts):
sig = (sig.clone(args, kwargs) if isinstance(
sig, abstract.CallableSignature) else self.signature(
sig.name, args, kwargs))
return name or repr(sig), {
'schedule': schedule,
'task': sig.name,
'args': sig.args,
'kwargs': sig.kwargs,
'options': dict(sig.options, **opts),
}
def _add_periodic_task(self, key, entry):
self._conf.beat_schedule[key] = entry
def create_task_cls(self):
"""Create a base task class bound to this app."""
return self.subclass_with_self(
self.task_cls,
name='Task',
attribute='_app',
keep_reduce=True,
abstract=True,
)
def subclass_with_self(self,
Class,
name=None,
attribute='app',
reverse=None,
keep_reduce=False,
**kw):
"""Subclass an app-compatible class.
App-compatible means that the class has a class attribute that
provides the default app it should use, for example:
``class Foo: app = None``.
Arguments:
Class (type): The app-compatible class to subclass.
name (str): Custom name for the target class.
attribute (str): Name of the attribute holding the app,
Default is 'app'.
reverse (str): Reverse path to this object used for pickling
purposes. For example, to get ``app.AsyncResult``,
use ``"AsyncResult"``.
keep_reduce (bool): If enabled a custom ``__reduce__``
implementation won't be provided.
"""
Class = symbol_by_name(Class)
reverse = reverse if reverse else Class.__name__
def __reduce__(self):
return _unpickle_appattr, (reverse, self.__reduce_args__())
attrs = dict({attribute: self},
__module__=Class.__module__,
__doc__=Class.__doc__,
**kw)
if not keep_reduce:
attrs['__reduce__'] = __reduce__
return type(bytes_if_py2(name or Class.__name__), (Class, ), attrs)
def _rgetattr(self, path):
return attrgetter(path)(self)
def __enter__(self):
return self
def __exit__(self, *exc_info):
self.close()
def __repr__(self):
return '<{0} {1}>'.format(type(self).__name__, appstr(self))
def __reduce__(self):
if self._using_v1_reduce:
return self.__reduce_v1__()
return (_unpickle_app_v2, (self.__class__, self.__reduce_keys__()))
def __reduce_v1__(self):
# Reduce only pickles the configuration changes,
# so the default configuration doesn't have to be passed
# between processes.
return (
_unpickle_app,
(self.__class__, self.Pickler) + self.__reduce_args__(),
)
def __reduce_keys__(self):
"""Keyword arguments used to reconstruct the object when unpickling."""
return {
'main': self.main,
'changes':
self._conf.changes if self.configured else self._preconf,
'loader': self.loader_cls,
'backend': self.backend_cls,
'amqp': self.amqp_cls,
'events': self.events_cls,
'log': self.log_cls,
'control': self.control_cls,
'fixups': self.fixups,
'config_source': self._config_source,
'task_cls': self.task_cls,
'namespace': self.namespace,
}
def __reduce_args__(self):
"""Deprecated method, please use :meth:`__reduce_keys__` instead."""
return (self.main, self._conf.changes if self.configured else {},
self.loader_cls, self.backend_cls, self.amqp_cls,
self.events_cls, self.log_cls, self.control_cls, False,
self._config_source)
@cached_property
def Worker(self):
"""Worker application.
See Also:
:class:`~@Worker`.
"""
return self.subclass_with_self('celery.apps.worker:Worker')
@cached_property
def WorkController(self, **kwargs):
"""Embeddable worker.
See Also:
:class:`~@WorkController`.
"""
return self.subclass_with_self('celery.worker:WorkController')
@cached_property
def Beat(self, **kwargs):
""":program:`celery beat` scheduler application.
See Also:
:class:`~@Beat`.
"""
return self.subclass_with_self('celery.apps.beat:Beat')
@cached_property
def Task(self):
"""Base task class for this app."""
return self.create_task_cls()
@cached_property
def annotations(self):
return prepare_annotations(self.conf.task_annotations)
@cached_property
def AsyncResult(self):
"""Create new result instance.
See Also:
:class:`celery.result.AsyncResult`.
"""
return self.subclass_with_self('celery.result:AsyncResult')
@cached_property
def ResultSet(self):
return self.subclass_with_self('celery.result:ResultSet')
@cached_property
def GroupResult(self):
"""Create new group result instance.
See Also:
:class:`celery.result.GroupResult`.
"""
return self.subclass_with_self('celery.result:GroupResult')
@property
def pool(self):
"""Broker connection pool: :class:`~@pool`.
Note:
This attribute is not related to the workers concurrency pool.
"""
if self._pool is None:
self._ensure_after_fork()
limit = self.conf.broker_pool_limit
pools.set_limit(limit)
self._pool = pools.connections[self.connection_for_write()]
return self._pool
@property
def current_task(self):
"""Instance of task being executed, or :const:`None`."""
return _task_stack.top
@property
def current_worker_task(self):
"""The task currently being executed by a worker or :const:`None`.
Differs from :data:`current_task` in that it's not affected
by tasks calling other tasks directly, or eagerly.
"""
return get_current_worker_task()
@cached_property
def oid(self):
"""Universally unique identifier for this app."""
# since 4.0: thread.get_ident() is not included when
# generating the process id. This is due to how the RPC
# backend now dedicates a single thread to receive results,
# which would not work if each thread has a separate id.
return oid_from(self, threads=False)
@cached_property
def amqp(self):
"""AMQP related functionality: :class:`~@amqp`."""
return instantiate(self.amqp_cls, app=self)
@cached_property
def backend(self):
"""Current backend instance."""
return self._get_backend()
@property
def conf(self):
"""Current configuration."""
if self._conf is None:
self._conf = self._load_config()
return self._conf
@conf.setter
def conf(self, d): # noqa
self._conf = d
@cached_property
def control(self):
"""Remote control: :class:`~@control`."""
return instantiate(self.control_cls, app=self)
@cached_property
def events(self):
"""Consuming and sending events: :class:`~@events`."""
return instantiate(self.events_cls, app=self)
@cached_property
def loader(self):
"""Current loader instance."""
return get_loader_cls(self.loader_cls)(app=self)
@cached_property
def log(self):
"""Logging: :class:`~@log`."""
return instantiate(self.log_cls, app=self)
@cached_property
def _canvas(self):
from celery import canvas
return canvas
@cached_property
def tasks(self):
"""Task registry.
Warning:
Accessing this attribute will also auto-finalize the app.
"""
self.finalize(auto=True)
return self._tasks
@property
def producer_pool(self):
return self.amqp.producer_pool
def uses_utc_timezone(self):
"""Check if the application uses the UTC timezone."""
return self.timezone == timezone.utc
@cached_property
def timezone(self):
"""Current timezone for this app.
This is a cached property taking the time zone from the
:setting:`timezone` setting.
"""
conf = self.conf
if not conf.timezone:
if conf.enable_utc:
return timezone.utc
else:
return timezone.local
return timezone.get_timezone(conf.timezone)
class Celery(object):
#: This is deprecated, use :meth:`reduce_keys` instead
Pickler = AppPickler
SYSTEM = platforms.SYSTEM
IS_OSX, IS_WINDOWS = platforms.IS_OSX, platforms.IS_WINDOWS
amqp_cls = 'celery.app.amqp:AMQP'
backend_cls = None
events_cls = 'celery.events:Events'
loader_cls = 'celery.loaders.app:AppLoader'
log_cls = 'celery.app.log:Logging'
control_cls = 'celery.app.control:Control'
task_cls = 'celery.app.task:Task'
registry_cls = TaskRegistry
_fixups = None
_pool = None
_conf = None
builtin_fixups = BUILTIN_FIXUPS
#: Signal sent when app is loading configuration.
on_configure = None
#: Signal sent after app has prepared the configuration.
on_after_configure = None
#: Signal sent after app has been finalized.
on_after_finalize = None
#: ignored
accept_magic_kwargs = False
def __init__(self,
main=None,
loader=None,
backend=None,
amqp=None,
events=None,
log=None,
control=None,
set_as_current=True,
tasks=None,
broker=None,
include=None,
changes=None,
config_source=None,
fixups=None,
task_cls=None,
autofinalize=True,
**kwargs):
self.clock = LamportClock()
self.main = main
self.amqp_cls = amqp or self.amqp_cls
self.events_cls = events or self.events_cls
self.loader_cls = loader or self.loader_cls
self.log_cls = log or self.log_cls
self.control_cls = control or self.control_cls
self.task_cls = task_cls or self.task_cls
self.set_as_current = set_as_current
self.registry_cls = symbol_by_name(self.registry_cls)
self.user_options = defaultdict(set)
self.steps = defaultdict(set)
self.autofinalize = autofinalize
self.configured = False
self._config_source = config_source
self._pending_defaults = deque()
self._pending_periodic_tasks = deque()
self.finalized = False
self._finalize_mutex = threading.Lock()
self._pending = deque()
self._tasks = tasks
if not isinstance(self._tasks, TaskRegistry):
self._tasks = TaskRegistry(self._tasks or {})
# If the class defines a custom __reduce_args__ we need to use
# the old way of pickling apps, which is pickling a list of
# args instead of the new way that pickles a dict of keywords.
self._using_v1_reduce = app_has_custom(self, '__reduce_args__')
# these options are moved to the config to
# simplify pickling of the app object.
self._preconf = changes or {}
if broker:
self._preconf['BROKER_URL'] = broker
if backend:
self._preconf['CELERY_RESULT_BACKEND'] = backend
if include:
self._preconf['CELERY_IMPORTS'] = include
# - Apply fixups.
self.fixups = set(self.builtin_fixups) if fixups is None else fixups
# ...store fixup instances in _fixups to keep weakrefs alive.
self._fixups = [symbol_by_name(fixup)(self) for fixup in self.fixups]
if self.set_as_current:
self.set_current()
# Signals
if self.on_configure is None:
# used to be a method pre 3.2
self.on_configure = Signal()
self.on_after_configure = Signal()
self.on_after_finalize = Signal()
self.on_init()
_register_app(self)
def set_current(self):
_set_current_app(self)
def set_default(self):
set_default_app(self)
def __enter__(self):
return self
def __exit__(self, *exc_info):
self.close()
def close(self):
self._maybe_close_pool()
def on_init(self):
"""Optional callback called at init."""
pass
def start(self, argv=None):
return instantiate('celery.bin.celery:CeleryCommand',
app=self).execute_from_commandline(argv)
def worker_main(self, argv=None):
return instantiate('celery.bin.worker:worker',
app=self).execute_from_commandline(argv)
def task(self, *args, **opts):
"""Creates new task class from any callable."""
if _EXECV and opts.get('lazy', True):
# When using execv the task in the original module will point to a
# different app, so doing things like 'add.request' will point to
# a different task instance. This makes sure it will always use
# the task instance from the current app.
# Really need a better solution for this :(
from . import shared_task
return shared_task(*args, lazy=False, **opts)
def inner_create_task_cls(shared=True, filter=None, lazy=True, **opts):
_filt = filter # stupid 2to3
def _create_task_cls(fun):
if shared:
cons = lambda app: app._task_from_fun(fun, **opts)
cons.__name__ = fun.__name__
connect_on_app_finalize(cons)
if not lazy or self.finalized:
ret = self._task_from_fun(fun, **opts)
else:
# return a proxy object that evaluates on first use
ret = PromiseProxy(self._task_from_fun, (fun, ),
opts,
__doc__=fun.__doc__)
self._pending.append(ret)
if _filt:
return _filt(ret)
return ret
return _create_task_cls
if len(args) == 1:
if callable(args[0]):
return inner_create_task_cls(**opts)(*args)
raise TypeError('argument 1 to @task() must be a callable')
if args:
raise TypeError(
'@task() takes exactly 1 argument ({0} given)'.format(
sum([len(args), len(opts)])))
return inner_create_task_cls(**opts)
def _task_from_fun(self, fun, name=None, base=None, bind=False, **options):
if not self.finalized and not self.autofinalize:
raise RuntimeError('Contract breach: app not finalized')
name = name or self.gen_task_name(fun.__name__, fun.__module__)
base = base or self.Task
if name not in self._tasks:
run = fun if bind else staticmethod(fun)
task = type(
fun.__name__, (base, ),
dict(
{
'app': self,
'name': name,
'run': run,
'_decorated': True,
'__doc__': fun.__doc__,
'__module__': fun.__module__,
'__header__': staticmethod(
head_from_fun(fun, bound=bind)),
'__wrapped__': run
}, **options))()
self._tasks[task.name] = task
task.bind(self) # connects task to this app
else:
task = self._tasks[name]
return task
def gen_task_name(self, name, module):
return gen_task_name(self, name, module)
def finalize(self, auto=False):
with self._finalize_mutex:
if not self.finalized:
if auto and not self.autofinalize:
raise RuntimeError('Contract breach: app not finalized')
self.finalized = True
_announce_app_finalized(self)
pending = self._pending
while pending:
maybe_evaluate(pending.popleft())
for task in values(self._tasks):
task.bind(self)
self.on_after_finalize.send(sender=self)
def add_defaults(self, fun):
if not callable(fun):
d, fun = fun, lambda: d
if self.configured:
return self._conf.add_defaults(fun())
self._pending_defaults.append(fun)
def config_from_object(self, obj, silent=False, force=False):
self._config_source = obj
if force or self.configured:
self._conf = None
return self.loader.config_from_object(obj, silent=silent)
def config_from_envvar(self, variable_name, silent=False, force=False):
module_name = os.environ.get(variable_name)
if not module_name:
if silent:
return False
raise ImproperlyConfigured(
ERR_ENVVAR_NOT_SET.format(variable_name))
return self.config_from_object(module_name, silent=silent, force=force)
def config_from_cmdline(self, argv, namespace='celery'):
(self._conf if self.configured else self.conf).update(
self.loader.cmdline_config_parser(argv, namespace))
def setup_security(self,
allowed_serializers=None,
key=None,
cert=None,
store=None,
digest='sha1',
serializer='json'):
from celery.security import setup_security
return setup_security(allowed_serializers,
key,
cert,
store,
digest,
serializer,
app=self)
def autodiscover_tasks(self, packages, related_name='tasks', force=False):
if force:
return self._autodiscover_tasks(packages, related_name)
signals.import_modules.connect(promise(
self._autodiscover_tasks,
(packages, related_name),
),
weak=False,
sender=self)
def _autodiscover_tasks(self, packages, related_name='tasks', **kwargs):
# argument may be lazy
packages = packages() if callable(packages) else packages
self.loader.autodiscover_tasks(packages, related_name)
def send_task(self,
name,
args=None,
kwargs=None,
countdown=None,
eta=None,
task_id=None,
producer=None,
connection=None,
router=None,
result_cls=None,
expires=None,
publisher=None,
link=None,
link_error=None,
add_to_parent=True,
group_id=None,
retries=0,
chord=None,
reply_to=None,
time_limit=None,
soft_time_limit=None,
root_id=None,
parent_id=None,
route_name=None,
shadow=None,
**options):
amqp = self.amqp
task_id = task_id or uuid()
producer = producer or publisher # XXX compat
router = router or amqp.router
conf = self.conf
if conf.CELERY_ALWAYS_EAGER: # pragma: no cover
warnings.warn(AlwaysEagerIgnored(
'CELERY_ALWAYS_EAGER has no effect on send_task', ),
stacklevel=2)
options = router.route(options, route_name or name, args, kwargs)
message = amqp.create_task_message(
task_id,
name,
args,
kwargs,
countdown,
eta,
group_id,
expires,
retries,
chord,
maybe_list(link),
maybe_list(link_error),
reply_to or self.oid,
time_limit,
soft_time_limit,
self.conf.CELERY_SEND_TASK_SENT_EVENT,
root_id,
parent_id,
shadow,
)
if connection:
producer = amqp.Producer(connection)
with self.producer_or_acquire(producer) as P:
self.backend.on_task_call(P, task_id)
amqp.send_task_message(P, name, message, **options)
result = (result_cls or self.AsyncResult)(task_id)
if add_to_parent:
parent = get_current_worker_task()
if parent:
parent.add_trail(result)
return result
def connection(self,
hostname=None,
userid=None,
password=None,
virtual_host=None,
port=None,
ssl=None,
connect_timeout=None,
transport=None,
transport_options=None,
heartbeat=None,
login_method=None,
failover_strategy=None,
**kwargs):
conf = self.conf
return self.amqp.Connection(
hostname or conf.BROKER_URL,
userid or conf.BROKER_USER,
password or conf.BROKER_PASSWORD,
virtual_host or conf.BROKER_VHOST,
port or conf.BROKER_PORT,
transport=transport or conf.BROKER_TRANSPORT,
ssl=self.either('BROKER_USE_SSL', ssl),
heartbeat=heartbeat,
login_method=login_method or conf.BROKER_LOGIN_METHOD,
failover_strategy=(failover_strategy
or conf.BROKER_FAILOVER_STRATEGY),
transport_options=dict(conf.BROKER_TRANSPORT_OPTIONS,
**transport_options or {}),
connect_timeout=self.either('BROKER_CONNECTION_TIMEOUT',
connect_timeout),
)
broker_connection = connection
def _acquire_connection(self, pool=True):
"""Helper for :meth:`connection_or_acquire`."""
if pool:
return self.pool.acquire(block=True)
return self.connection()
def connection_or_acquire(self, connection=None, pool=True, *_, **__):
return FallbackContext(connection, self._acquire_connection, pool=pool)
default_connection = connection_or_acquire # XXX compat
def producer_or_acquire(self, producer=None):
return FallbackContext(
producer,
self.amqp.producer_pool.acquire,
block=True,
)
default_producer = producer_or_acquire # XXX compat
def prepare_config(self, c):
"""Prepare configuration before it is merged with the defaults."""
return find_deprecated_settings(c)
def now(self):
return self.loader.now(utc=self.conf.CELERY_ENABLE_UTC)
def mail_admins(self, subject, body, fail_silently=False):
conf = self.conf
if conf.ADMINS:
to = [admin_email for _, admin_email in conf.ADMINS]
return self.loader.mail_admins(
subject,
body,
fail_silently,
to=to,
sender=conf.SERVER_EMAIL,
host=conf.EMAIL_HOST,
port=conf.EMAIL_PORT,
user=conf.EMAIL_HOST_USER,
password=conf.EMAIL_HOST_PASSWORD,
timeout=conf.EMAIL_TIMEOUT,
use_ssl=conf.EMAIL_USE_SSL,
use_tls=conf.EMAIL_USE_TLS,
charset=conf.EMAIL_CHARSET,
)
def select_queues(self, queues=None):
return self.amqp.queues.select(queues)
def either(self, default_key, *values):
"""Fallback to the value of a configuration key if none of the
`*values` are true."""
return first(None, values) or self.conf.get(default_key)
def bugreport(self):
return bugreport(self)
def _get_backend(self):
from celery.backends import get_backend_by_url
backend, url = get_backend_by_url(
self.backend_cls or self.conf.CELERY_RESULT_BACKEND, self.loader)
return backend(app=self, url=url)
def _load_config(self):
if isinstance(self.on_configure, Signal):
self.on_configure.send(sender=self)
else:
# used to be a method pre 3.2
self.on_configure()
if self._config_source:
self.loader.config_from_object(self._config_source)
defaults = dict(deepcopy(DEFAULTS), **self._preconf)
self.configured = True
s = self._conf = Settings(
{},
[self.prepare_config(self.loader.conf), defaults],
)
# load lazy config dict initializers.
pending_def = self._pending_defaults
while pending_def:
s.add_defaults(maybe_evaluate(pending_def.popleft()()))
# load lazy periodic tasks
pending_beat = self._pending_periodic_tasks
while pending_beat:
pargs, pkwargs = pending_beat.popleft()
self._add_periodic_task(*pargs, **pkwargs)
self.on_after_configure.send(sender=self, source=s)
return s
def _after_fork(self, obj_):
self._maybe_close_pool()
def _maybe_close_pool(self):
if self._pool:
self._pool.force_close_all()
self._pool = None
amqp = self.__dict__.get('amqp')
if amqp is not None and amqp._producer_pool is not None:
amqp._producer_pool.force_close_all()
amqp._producer_pool = None
def signature(self, *args, **kwargs):
kwargs['app'] = self
return self.canvas.signature(*args, **kwargs)
def add_periodic_task(self, *args, **kwargs):
if not self.configured:
return self._pending_periodic_tasks.append((args, kwargs))
return self._add_periodic_task(*args, **kwargs)
def _add_periodic_task(self,
schedule,
sig,
args=(),
kwargs={},
name=None,
**opts):
from .task import Task
sig = (self.signature(sig.name, args, kwargs)
if isinstance(sig, Task) else sig.clone(args, kwargs))
name = name or ':'.join([sig.name, ','.join(map(str, sig.args))])
self._conf.CELERYBEAT_SCHEDULE[name] = {
'schedule': schedule,
'task': sig.name,
'args': sig.args,
'kwargs': sig.kwargs,
'options': dict(sig.options, **opts),
}
def create_task_cls(self):
"""Creates a base task class using default configuration
taken from this app."""
return self.subclass_with_self(
self.task_cls,
name='Task',
attribute='_app',
keep_reduce=True,
abstract=True,
)
def subclass_with_self(self,
Class,
name=None,
attribute='app',
reverse=None,
keep_reduce=False,
**kw):
"""Subclass an app-compatible class by setting its app attribute
to be this app instance.
App-compatible means that the class has a class attribute that
provides the default app it should use, e.g.
``class Foo: app = None``.
:param Class: The app-compatible class to subclass.
:keyword name: Custom name for the target class.
:keyword attribute: Name of the attribute holding the app,
default is 'app'.
"""
Class = symbol_by_name(Class)
reverse = reverse if reverse else Class.__name__
def __reduce__(self):
return _unpickle_appattr, (reverse, self.__reduce_args__())
attrs = dict({attribute: self},
__module__=Class.__module__,
__doc__=Class.__doc__,
**kw)
if not keep_reduce:
attrs['__reduce__'] = __reduce__
return type(name or Class.__name__, (Class, ), attrs)
def _rgetattr(self, path):
return attrgetter(path)(self)
def __repr__(self):
return '<{0} {1}>'.format(type(self).__name__, appstr(self))
def __reduce__(self):
if self._using_v1_reduce:
return self.__reduce_v1__()
return (_unpickle_app_v2, (self.__class__, self.__reduce_keys__()))
def __reduce_v1__(self):
# Reduce only pickles the configuration changes,
# so the default configuration doesn't have to be passed
# between processes.
return (
_unpickle_app,
(self.__class__, self.Pickler) + self.__reduce_args__(),
)
def __reduce_keys__(self):
"""Return keyword arguments used to reconstruct the object
when unpickling."""
return {
'main': self.main,
'changes': self._conf.changes if self._conf else self._preconf,
'loader': self.loader_cls,
'backend': self.backend_cls,
'amqp': self.amqp_cls,
'events': self.events_cls,
'log': self.log_cls,
'control': self.control_cls,
'fixups': self.fixups,
'config_source': self._config_source,
'task_cls': self.task_cls,
}
def __reduce_args__(self):
"""Deprecated method, please use :meth:`__reduce_keys__` instead."""
return (self.main, self._conf.changes if self._conf else {},
self.loader_cls, self.backend_cls, self.amqp_cls,
self.events_cls, self.log_cls, self.control_cls, False,
self._config_source)
@cached_property
def Worker(self):
return self.subclass_with_self('celery.apps.worker:Worker')
@cached_property
def WorkController(self, **kwargs):
return self.subclass_with_self('celery.worker:WorkController')
@cached_property
def Beat(self, **kwargs):
return self.subclass_with_self('celery.apps.beat:Beat')
@cached_property
def Task(self):
return self.create_task_cls()
@cached_property
def annotations(self):
return prepare_annotations(self.conf.CELERY_ANNOTATIONS)
@cached_property
def AsyncResult(self):
return self.subclass_with_self('celery.result:AsyncResult')
@cached_property
def ResultSet(self):
return self.subclass_with_self('celery.result:ResultSet')
@cached_property
def GroupResult(self):
return self.subclass_with_self('celery.result:GroupResult')
@cached_property
def TaskSet(self): # XXX compat
"""Deprecated! Please use :class:`celery.group` instead."""
return self.subclass_with_self('celery.task.sets:TaskSet')
@cached_property
def TaskSetResult(self): # XXX compat
"""Deprecated! Please use :attr:`GroupResult` instead."""
return self.subclass_with_self('celery.result:TaskSetResult')
@property
def pool(self):
if self._pool is None:
_ensure_after_fork()
limit = self.conf.BROKER_POOL_LIMIT
self._pool = self.connection().Pool(limit=limit)
return self._pool
@property
def current_task(self):
return _task_stack.top
@cached_property
def oid(self):
return oid_from(self)
@cached_property
def amqp(self):
return instantiate(self.amqp_cls, app=self)
@cached_property
def backend(self):
return self._get_backend()
@property
def conf(self):
if self._conf is None:
self._load_config()
return self._conf
@conf.setter
def conf(self, d): # noqa
self._conf = d
@cached_property
def control(self):
return instantiate(self.control_cls, app=self)
@cached_property
def events(self):
return instantiate(self.events_cls, app=self)
@cached_property
def loader(self):
return get_loader_cls(self.loader_cls)(app=self)
@cached_property
def log(self):
return instantiate(self.log_cls, app=self)
@cached_property
def canvas(self):
from celery import canvas
return canvas
@cached_property
def tasks(self):
self.finalize(auto=True)
return self._tasks
@cached_property
def timezone(self):
from celery.utils.timeutils import timezone
conf = self.conf
tz = conf.CELERY_TIMEZONE
if not tz:
return (timezone.get_timezone('UTC')
if conf.CELERY_ENABLE_UTC else timezone.local)
return timezone.get_timezone(conf.CELERY_TIMEZONE)
class Celery(object):
"""Celery application.
:param main: Name of the main module if running as `__main__`.
This is used as the prefix for auto-generated task names.
:keyword broker: URL of the default broker used.
:keyword loader: The loader class, or the name of the loader class to use.
Default is :class:`celery.loaders.app.AppLoader`.
:keyword backend: The result store backend class, or the name of the
backend class to use. Default is the value of the
:setting:`result_backend` setting.
:keyword amqp: AMQP object or class name.
:keyword events: Events object or class name.
:keyword log: Log object or class name.
:keyword control: Control object or class name.
:keyword set_as_current: Make this the global current app.
:keyword tasks: A task registry or the name of a registry class.
:keyword include: List of modules every worker should import.
:keyword fixups: List of fix-up plug-ins (see e.g.
:mod:`celery.fixups.django`).
:keyword autofinalize: If set to False a :exc:`RuntimeError`
will be raised if the task registry or tasks are used before
the app is finalized.
"""
#: This is deprecated, use :meth:`reduce_keys` instead
Pickler = AppPickler
SYSTEM = platforms.SYSTEM
IS_OSX, IS_WINDOWS = platforms.IS_OSX, platforms.IS_WINDOWS
#: Name of the `__main__` module. Required for standalone scripts.
#:
#: If set this will be used instead of `__main__` when automatically
#: generating task names.
main = None
#: Custom options for command-line programs.
#: See :ref:`extending-commandoptions`
user_options = None
#: Custom bootsteps to extend and modify the worker.
#: See :ref:`extending-bootsteps`.
steps = None
builtin_fixups = BUILTIN_FIXUPS
amqp_cls = 'celery.app.amqp:AMQP'
backend_cls = None
events_cls = 'celery.events:Events'
loader_cls = 'celery.loaders.app:AppLoader'
log_cls = 'celery.app.log:Logging'
control_cls = 'celery.app.control:Control'
task_cls = 'celery.app.task:Task'
registry_cls = TaskRegistry
_fixups = None
_pool = None
_conf = None
_after_fork_registered = False
#: Signal sent when app is loading configuration.
on_configure = None
#: Signal sent after app has prepared the configuration.
on_after_configure = None
#: Signal sent after app has been finalized.
on_after_finalize = None
#: Signal sent by every new process after fork.
on_after_fork = None
def __init__(self, main=None, loader=None, backend=None,
amqp=None, events=None, log=None, control=None,
set_as_current=True, tasks=None, broker=None, include=None,
changes=None, config_source=None, fixups=None, task_cls=None,
autofinalize=True, namespace=None, **kwargs):
self.clock = LamportClock()
self.main = main
self.amqp_cls = amqp or self.amqp_cls
self.events_cls = events or self.events_cls
self.loader_cls = loader or self.loader_cls
self.log_cls = log or self.log_cls
self.control_cls = control or self.control_cls
self.task_cls = task_cls or self.task_cls
self.set_as_current = set_as_current
self.registry_cls = symbol_by_name(self.registry_cls)
self.user_options = defaultdict(set)
self.steps = defaultdict(set)
self.autofinalize = autofinalize
self.namespace = namespace
self.configured = False
self._config_source = config_source
self._pending_defaults = deque()
self._pending_periodic_tasks = deque()
self.finalized = False
self._finalize_mutex = threading.Lock()
self._pending = deque()
self._tasks = tasks
if not isinstance(self._tasks, TaskRegistry):
self._tasks = TaskRegistry(self._tasks or {})
# If the class defines a custom __reduce_args__ we need to use
# the old way of pickling apps, which is pickling a list of
# args instead of the new way that pickles a dict of keywords.
self._using_v1_reduce = app_has_custom(self, '__reduce_args__')
# these options are moved to the config to
# simplify pickling of the app object.
self._preconf = changes or {}
self._preconf_set_by_auto = set()
self.__autoset('broker_url', broker)
self.__autoset('result_backend', backend)
self.__autoset('include', include)
self._conf = Settings(
PendingConfiguration(
self._preconf, self._get_from_conf_and_finalize),
prefix=self.namespace,
)
# - Apply fix-ups.
self.fixups = set(self.builtin_fixups) if fixups is None else fixups
# ...store fixup instances in _fixups to keep weakrefs alive.
self._fixups = [symbol_by_name(fixup)(self) for fixup in self.fixups]
if self.set_as_current:
self.set_current()
# Signals
if self.on_configure is None:
# used to be a method pre 4.0
self.on_configure = Signal()
self.on_after_configure = Signal()
self.on_after_finalize = Signal()
self.on_after_fork = Signal()
self.on_init()
_register_app(self)
def on_init(self):
"""Optional callback called at init."""
pass
def __autoset(self, key, value):
if value:
self._preconf[key] = value
self._preconf_set_by_auto.add(key)
def set_current(self):
"""Makes this the current app for this thread."""
_set_current_app(self)
def set_default(self):
"""Makes this the default app for all threads."""
set_default_app(self)
def _ensure_after_fork(self):
if not self._after_fork_registered:
self._after_fork_registered = True
if register_after_fork is not None:
register_after_fork(self, _after_fork_cleanup_app)
def __enter__(self):
return self
def __exit__(self, *exc_info):
self.close()
def close(self):
"""Clean up after the application.
Only necessary for dynamically created apps for which you can
use the :keyword:`with` statement instead:
.. code-block:: python
with Celery(set_as_current=False) as app:
with app.connection_for_write() as conn:
pass
"""
self._pool = None
_deregister_app(self)
def start(self, argv=None):
"""Run :program:`celery` using `argv`.
Uses :data:`sys.argv` if `argv` is not specified.
"""
return instantiate(
'celery.bin.celery:CeleryCommand', app=self
).execute_from_commandline(argv)
def worker_main(self, argv=None):
"""Run :program:`celery worker` using `argv`.
Uses :data:`sys.argv` if `argv` is not specified.
"""
return instantiate(
'celery.bin.worker:worker', app=self
).execute_from_commandline(argv)
def task(self, *args, **opts):
"""Decorator to create a task class out of any callable.
Examples:
.. code-block:: python
@app.task
def refresh_feed(url):
store_feed(feedparser.parse(url))
with setting extra options:
.. code-block:: python
@app.task(exchange='feeds')
def refresh_feed(url):
return store_feed(feedparser.parse(url))
.. admonition:: App Binding
For custom apps the task decorator will return a proxy
object, so that the act of creating the task is not performed
until the task is used or the task registry is accessed.
If you are depending on binding to be deferred, then you must
not access any attributes on the returned object until the
application is fully set up (finalized).
"""
if USING_EXECV and opts.get('lazy', True):
# When using execv the task in the original module will point to a
# different app, so doing things like 'add.request' will point to
# a different task instance. This makes sure it will always use
# the task instance from the current app.
# Really need a better solution for this :(
from . import shared_task
return shared_task(*args, lazy=False, **opts)
def inner_create_task_cls(shared=True, filter=None, lazy=True, **opts):
_filt = filter # stupid 2to3
def _create_task_cls(fun):
if shared:
def cons(app):
return app._task_from_fun(fun, **opts)
cons.__name__ = fun.__name__
connect_on_app_finalize(cons)
if not lazy or self.finalized:
ret = self._task_from_fun(fun, **opts)
else:
# return a proxy object that evaluates on first use
ret = PromiseProxy(self._task_from_fun, (fun,), opts,
__doc__=fun.__doc__)
self._pending.append(ret)
if _filt:
return _filt(ret)
return ret
return _create_task_cls
if len(args) == 1:
if callable(args[0]):
return inner_create_task_cls(**opts)(*args)
raise TypeError('argument 1 to @task() must be a callable')
if args:
raise TypeError(
'@task() takes exactly 1 argument ({0} given)'.format(
sum([len(args), len(opts)])))
return inner_create_task_cls(**opts)
def _task_from_fun(self, fun, name=None, base=None, bind=False, **options):
if not self.finalized and not self.autofinalize:
raise RuntimeError('Contract breach: app not finalized')
name = name or self.gen_task_name(fun.__name__, fun.__module__)
base = base or self.Task
if name not in self._tasks:
run = fun if bind else staticmethod(fun)
task = type(fun.__name__, (base,), dict({
'app': self,
'name': name,
'run': run,
'_decorated': True,
'__doc__': fun.__doc__,
'__module__': fun.__module__,
'__header__': staticmethod(head_from_fun(fun, bound=bind)),
'__wrapped__': run}, **options))()
self._tasks[task.name] = task
task.bind(self) # connects task to this app
autoretry_for = tuple(options.get('autoretry_for', ()))
retry_kwargs = options.get('retry_kwargs', {})
if autoretry_for and not hasattr(task, '_orig_run'):
@wraps(task.run)
def run(*args, **kwargs):
try:
return task._orig_run(*args, **kwargs)
except autoretry_for as exc:
raise task.retry(exc=exc, **retry_kwargs)
task._orig_run, task.run = task.run, run
else:
task = self._tasks[name]
return task
def gen_task_name(self, name, module):
return gen_task_name(self, name, module)
def finalize(self, auto=False):
"""Finalizes the app by loading built-in tasks,
and evaluating pending task decorators."""
with self._finalize_mutex:
if not self.finalized:
if auto and not self.autofinalize:
raise RuntimeError('Contract breach: app not finalized')
self.finalized = True
_announce_app_finalized(self)
pending = self._pending
while pending:
maybe_evaluate(pending.popleft())
for task in values(self._tasks):
task.bind(self)
self.on_after_finalize.send(sender=self)
def add_defaults(self, fun):
"""Add default configuration from dict ``d``.
If the argument is a callable function then it will be regarded
as a promise, and it won't be loaded until the configuration is
actually needed.
This method can be compared to:
.. code-block:: pycon
>>> celery.conf.update(d)
with a difference that 1) no copy will be made and 2) the dict will
not be transferred when the worker spawns child processes, so
it's important that the same configuration happens at import time
when pickle restores the object on the other side.
"""
if not callable(fun):
d, fun = fun, lambda: d
if self.configured:
return self._conf.add_defaults(fun())
self._pending_defaults.append(fun)
def config_from_object(self, obj,
silent=False, force=False, namespace=None):
"""Reads configuration from object, where object is either
an object or the name of a module to import.
:keyword silent: If true then import errors will be ignored.
:keyword force: Force reading configuration immediately.
By default the configuration will be read only when required.
.. code-block:: pycon
>>> celery.config_from_object('myapp.celeryconfig')
>>> from myapp import celeryconfig
>>> celery.config_from_object(celeryconfig)
"""
self._config_source = obj
self.namespace = namespace or self.namespace
if force or self.configured:
self._conf = None
if self.loader.config_from_object(obj, silent=silent):
return self.conf
def config_from_envvar(self, variable_name, silent=False, force=False):
"""Read configuration from environment variable.
The value of the environment variable must be the name
of a module to import.
.. code-block:: pycon
>>> os.environ['CELERY_CONFIG_MODULE'] = 'myapp.celeryconfig'
>>> celery.config_from_envvar('CELERY_CONFIG_MODULE')
"""
module_name = os.environ.get(variable_name)
if not module_name:
if silent:
return False
raise ImproperlyConfigured(
ERR_ENVVAR_NOT_SET.format(variable_name))
return self.config_from_object(module_name, silent=silent, force=force)
def config_from_cmdline(self, argv, namespace='celery'):
self._conf.update(
self.loader.cmdline_config_parser(argv, namespace)
)
def setup_security(self, allowed_serializers=None, key=None, cert=None,
store=None, digest='sha1', serializer='json'):
"""Setup the message-signing serializer.
This will affect all application instances (a global operation).
Disables untrusted serializers and if configured to use the ``auth``
serializer will register the ``auth`` serializer with the provided
settings into the Kombu serializer registry.
:keyword allowed_serializers: List of serializer names, or
content_types that should be exempt from being disabled.
:keyword key: Name of private key file to use.
Defaults to the :setting:`security_key` setting.
:keyword cert: Name of certificate file to use.
Defaults to the :setting:`security_certificate` setting.
:keyword store: Directory containing certificates.
Defaults to the :setting:`security_cert_store` setting.
:keyword digest: Digest algorithm used when signing messages.
Default is ``sha1``.
:keyword serializer: Serializer used to encode messages after
they have been signed. See :setting:`task_serializer` for
the serializers supported.
Default is ``json``.
"""
from celery.security import setup_security
return setup_security(allowed_serializers, key, cert,
store, digest, serializer, app=self)
def autodiscover_tasks(self, packages=None,
related_name='tasks', force=False):
"""Try to auto-discover and import modules with a specific name (by
default 'tasks').
If the name is empty, this will be delegated to fix-ups (e.g. Django).
For example if you have an (imagined) directory tree like this:
.. code-block:: text
foo/__init__.py
tasks.py
models.py
bar/__init__.py
tasks.py
models.py
baz/__init__.py
models.py
Then calling ``app.autodiscover_tasks(['foo', bar', 'baz'])`` will
result in the modules ``foo.tasks`` and ``bar.tasks`` being imported.
:param packages: List of packages to search.
This argument may also be a callable, in which case the
value returned is used (for lazy evaluation).
:keyword related_name: The name of the module to find. Defaults
to "tasks", which means it look for "module.tasks" for every
module in ``packages``.
:keyword force: By default this call is lazy so that the actual
auto-discovery will not happen until an application imports the
default modules. Forcing will cause the auto-discovery to happen
immediately.
"""
if force:
return self._autodiscover_tasks(packages, related_name)
signals.import_modules.connect(starpromise(
self._autodiscover_tasks, packages, related_name,
), weak=False, sender=self)
def _autodiscover_tasks(self, packages, related_name, **kwargs):
if packages:
return self._autodiscover_tasks_from_names(packages, related_name)
return self._autodiscover_tasks_from_fixups(related_name)
def _autodiscover_tasks_from_names(self, packages, related_name):
# packages argument can be lazy
return self.loader.autodiscover_tasks(
packages() if callable(packages) else packages, related_name,
)
def _autodiscover_tasks_from_fixups(self, related_name):
return self._autodiscover_tasks_from_names([
pkg for fixup in self._fixups
for pkg in fixup.autodiscover_tasks()
if hasattr(fixup, 'autodiscover_tasks')
], related_name=related_name)
def send_task(self, name, args=None, kwargs=None, countdown=None,
eta=None, task_id=None, producer=None, connection=None,
router=None, result_cls=None, expires=None,
publisher=None, link=None, link_error=None,
add_to_parent=True, group_id=None, retries=0, chord=None,
reply_to=None, time_limit=None, soft_time_limit=None,
root_id=None, parent_id=None, route_name=None,
shadow=None, chain=None, **options):
"""Send task by name.
:param name: Name of task to call (e.g. `"tasks.add"`).
:keyword result_cls: Specify custom result class. Default is
using :meth:`AsyncResult`.
Otherwise supports the same arguments as :meth:`@-Task.apply_async`.
"""
parent = have_parent = None
amqp = self.amqp
task_id = task_id or uuid()
producer = producer or publisher # XXX compat
router = router or amqp.router
conf = self.conf
if conf.task_always_eager: # pragma: no cover
warnings.warn(AlwaysEagerIgnored(
'task_always_eager has no effect on send_task',
), stacklevel=2)
options = router.route(options, route_name or name, args, kwargs)
if root_id is None:
parent, have_parent = self.current_worker_task, True
if parent:
root_id = parent.request.root_id or parent.request.id
if parent_id is None:
if not have_parent:
parent, have_parent = self.current_worker_task, True
if parent:
parent_id = parent.request.id
message = amqp.create_task_message(
task_id, name, args, kwargs, countdown, eta, group_id,
expires, retries, chord,
maybe_list(link), maybe_list(link_error),
reply_to or self.oid, time_limit, soft_time_limit,
self.conf.task_send_sent_event,
root_id, parent_id, shadow, chain,
)
if connection:
producer = amqp.Producer(connection)
with self.producer_or_acquire(producer) as P:
self.backend.on_task_call(P, task_id)
amqp.send_task_message(P, name, message, **options)
result = (result_cls or self.AsyncResult)(task_id)
if add_to_parent:
if not have_parent:
parent, have_parent = self.current_worker_task, True
if parent:
parent.add_trail(result)
return result
def connection_for_read(self, url=None, **kwargs):
"""Establish connection used for consuming.
See :meth:`connection` for supported arguments.
"""
return self._connection(url or self.conf.broker_read_url, **kwargs)
def connection_for_write(self, url=None, **kwargs):
"""Establish connection used for producing.
See :meth:`connection` for supported arguments.
"""
return self._connection(url or self.conf.broker_write_url, **kwargs)
def connection(self, hostname=None, userid=None, password=None,
virtual_host=None, port=None, ssl=None,
connect_timeout=None, transport=None,
transport_options=None, heartbeat=None,
login_method=None, failover_strategy=None, **kwargs):
"""Establish a connection to the message broker.
Please use :meth:`connection_for_read` and
:meth:`connection_for_write` instead, to convey the intent
of use for this connection.
:param url: Either the URL or the hostname of the broker to use.
:keyword hostname: URL, Hostname/IP-address of the broker.
If an URL is used, then the other argument below will
be taken from the URL instead.
:keyword userid: Username to authenticate as.
:keyword password: Password to authenticate with
:keyword virtual_host: Virtual host to use (domain).
:keyword port: Port to connect to.
:keyword ssl: Defaults to the :setting:`broker_use_ssl` setting.
:keyword transport: defaults to the :setting:`broker_transport`
setting.
:keyword transport_options: Dictionary of transport specific options.
:keyword heartbeat: AMQP Heartbeat in seconds (``pyamqp`` only).
:keyword login_method: Custom login method to use (AMQP only).
:keyword failover_strategy: Custom failover strategy.
:keyword \*\*kwargs: Additional arguments to :class:`kombu.Connection`.
:returns :class:`kombu.Connection`:
"""
return self.connection_for_write(
hostname or self.conf.broker_write_url,
userid=userid, password=password,
virtual_host=virtual_host, port=port, ssl=ssl,
connect_timeout=connect_timeout, transport=transport,
transport_options=transport_options, heartbeat=heartbeat,
login_method=login_method, failover_strategy=failover_strategy,
**kwargs
)
def _connection(self, url, userid=None, password=None,
virtual_host=None, port=None, ssl=None,
connect_timeout=None, transport=None,
transport_options=None, heartbeat=None,
login_method=None, failover_strategy=None, **kwargs):
conf = self.conf
return self.amqp.Connection(
url,
userid or conf.broker_user,
password or conf.broker_password,
virtual_host or conf.broker_vhost,
port or conf.broker_port,
transport=transport or conf.broker_transport,
ssl=self.either('broker_use_ssl', ssl),
heartbeat=heartbeat,
login_method=login_method or conf.broker_login_method,
failover_strategy=(
failover_strategy or conf.broker_failover_strategy
),
transport_options=dict(
conf.broker_transport_options, **transport_options or {}
),
connect_timeout=self.either(
'broker_connection_timeout', connect_timeout
),
)
broker_connection = connection
def _acquire_connection(self, pool=True):
"""Helper for :meth:`connection_or_acquire`."""
if pool:
return self.pool.acquire(block=True)
return self.connection_for_write()
def connection_or_acquire(self, connection=None, pool=True, *_, **__):
"""For use within a :keyword:`with` statement to get a connection
from the pool if one is not already provided.
:keyword connection: If not provided, then a connection will be
acquired from the connection pool.
"""
return FallbackContext(connection, self._acquire_connection, pool=pool)
default_connection = connection_or_acquire # XXX compat
def producer_or_acquire(self, producer=None):
"""For use within a :keyword:`with` statement to get a producer
from the pool if one is not already provided
:keyword producer: If not provided, then a producer will be
acquired from the producer pool.
"""
return FallbackContext(
producer, self.producer_pool.acquire, block=True,
)
default_producer = producer_or_acquire # XXX compat
def prepare_config(self, c):
"""Prepare configuration before it is merged with the defaults."""
return find_deprecated_settings(c)
def now(self):
"""Return the current time and date as a
:class:`~datetime.datetime` object."""
return self.loader.now(utc=self.conf.enable_utc)
def mail_admins(self, subject, body, fail_silently=False):
"""Sends an email to the admins in the :setting:`admins` setting."""
conf = self.conf
if conf.admins:
to = [admin_email for _, admin_email in conf.admins]
return self.loader.mail_admins(
subject, body, fail_silently, to=to,
sender=conf.server_email,
host=conf.email_host,
port=conf.email_port,
user=conf.email_host_user,
password=conf.email_host_password,
timeout=conf.email_timeout,
use_ssl=conf.email_use_ssl,
use_tls=conf.email_use_tls,
charset=conf.email_charset,
)
def select_queues(self, queues=None):
"""Select a subset of queues, where queues must be a list of queue
names to keep."""
return self.amqp.queues.select(queues)
def either(self, default_key, *values):
"""Fallback to the value of a configuration key if none of the
`*values` are true."""
return first(None, [
first(None, values), starpromise(self.conf.get, default_key),
])
def bugreport(self):
"""Return a string with information useful for the Celery core
developers when reporting a bug."""
return bugreport(self)
def _get_backend(self):
from celery.backends import get_backend_by_url
backend, url = get_backend_by_url(
self.backend_cls or self.conf.result_backend,
self.loader)
return backend(app=self, url=url)
def _load_config(self):
if isinstance(self.on_configure, Signal):
self.on_configure.send(sender=self)
else:
# used to be a method pre 4.0
self.on_configure()
if self._config_source:
self.loader.config_from_object(self._config_source)
self.configured = True
settings = detect_settings(
self.prepare_config(self.loader.conf), self._preconf,
ignore_keys=self._preconf_set_by_auto, prefix=self.namespace,
)
if self._conf is not None:
# replace in place, as someone may have referenced app.conf,
# done some changes, accessed a key, and then try to make more
# changes to the reference and not the finalized value.
self._conf.swap_with(settings)
else:
self._conf = settings
# load lazy config dict initializers.
pending_def = self._pending_defaults
while pending_def:
self._conf.add_defaults(maybe_evaluate(pending_def.popleft()()))
# load lazy periodic tasks
pending_beat = self._pending_periodic_tasks
while pending_beat:
self._add_periodic_task(*pending_beat.popleft())
self.on_after_configure.send(sender=self, source=self._conf)
return self._conf
def _after_fork(self):
self._pool = None
try:
self.__dict__['amqp']._producer_pool = None
except (AttributeError, KeyError):
pass
self.on_after_fork.send(sender=self)
def signature(self, *args, **kwargs):
"""Return a new :class:`~celery.canvas.Signature` bound to this app.
See :meth:`~celery.signature`
"""
kwargs['app'] = self
return self.canvas.signature(*args, **kwargs)
def add_periodic_task(self, schedule, sig,
args=(), kwargs=(), name=None, **opts):
key, entry = self._sig_to_periodic_task_entry(
schedule, sig, args, kwargs, name, **opts)
if self.configured:
self._add_periodic_task(key, entry)
else:
self._pending_periodic_tasks.append((key, entry))
return key
def _sig_to_periodic_task_entry(self, schedule, sig,
args=(), kwargs={}, name=None, **opts):
sig = (sig.clone(args, kwargs)
if isinstance(sig, abstract.CallableSignature)
else self.signature(sig.name, args, kwargs))
return name or repr(sig), {
'schedule': schedule,
'task': sig.name,
'args': sig.args,
'kwargs': sig.kwargs,
'options': dict(sig.options, **opts),
}
def _add_periodic_task(self, key, entry):
self._conf.beat_schedule[key] = entry
def create_task_cls(self):
"""Creates a base task class using default configuration
taken from this app."""
return self.subclass_with_self(
self.task_cls, name='Task', attribute='_app',
keep_reduce=True, abstract=True,
)
def subclass_with_self(self, Class, name=None, attribute='app',
reverse=None, keep_reduce=False, **kw):
"""Subclass an app-compatible class by setting its app attribute
to be this app instance.
App-compatible means that the class has a class attribute that
provides the default app it should use, e.g.
``class Foo: app = None``.
:param Class: The app-compatible class to subclass.
:keyword name: Custom name for the target class.
:keyword attribute: Name of the attribute holding the app,
default is 'app'.
"""
Class = symbol_by_name(Class)
reverse = reverse if reverse else Class.__name__
def __reduce__(self):
return _unpickle_appattr, (reverse, self.__reduce_args__())
attrs = dict({attribute: self}, __module__=Class.__module__,
__doc__=Class.__doc__, **kw)
if not keep_reduce:
attrs['__reduce__'] = __reduce__
return type(bytes_if_py2(name or Class.__name__), (Class,), attrs)
def _rgetattr(self, path):
return attrgetter(path)(self)
def __repr__(self):
return '<{0} {1}>'.format(type(self).__name__, appstr(self))
def __reduce__(self):
if self._using_v1_reduce:
return self.__reduce_v1__()
return (_unpickle_app_v2, (self.__class__, self.__reduce_keys__()))
def __reduce_v1__(self):
# Reduce only pickles the configuration changes,
# so the default configuration doesn't have to be passed
# between processes.
return (
_unpickle_app,
(self.__class__, self.Pickler) + self.__reduce_args__(),
)
def __reduce_keys__(self):
"""Return keyword arguments used to reconstruct the object
when unpickling."""
return {
'main': self.main,
'changes':
self._conf.changes if self.configured else self._preconf,
'loader': self.loader_cls,
'backend': self.backend_cls,
'amqp': self.amqp_cls,
'events': self.events_cls,
'log': self.log_cls,
'control': self.control_cls,
'fixups': self.fixups,
'config_source': self._config_source,
'task_cls': self.task_cls,
'namespace': self.namespace,
}
def __reduce_args__(self):
"""Deprecated method, please use :meth:`__reduce_keys__` instead."""
return (self.main, self._conf.changes if self.configured else {},
self.loader_cls, self.backend_cls, self.amqp_cls,
self.events_cls, self.log_cls, self.control_cls,
False, self._config_source)
@cached_property
def Worker(self):
"""Worker application. See :class:`~@Worker`."""
return self.subclass_with_self('celery.apps.worker:Worker')
@cached_property
def WorkController(self, **kwargs):
"""Embeddable worker. See :class:`~@WorkController`."""
return self.subclass_with_self('celery.worker:WorkController')
@cached_property
def Beat(self, **kwargs):
""":program:`celery beat` scheduler application.
See :class:`~@Beat`.
"""
return self.subclass_with_self('celery.apps.beat:Beat')
@cached_property
def Task(self):
"""Base task class for this app."""
return self.create_task_cls()
@cached_property
def annotations(self):
return prepare_annotations(self.conf.task_annotations)
@cached_property
def AsyncResult(self):
"""Create new result instance.
See :class:`celery.result.AsyncResult`.
"""
return self.subclass_with_self('celery.result:AsyncResult')
@cached_property
def ResultSet(self):
return self.subclass_with_self('celery.result:ResultSet')
@cached_property
def GroupResult(self):
"""Create new group result instance.
See :class:`celery.result.GroupResult`.
"""
return self.subclass_with_self('celery.result:GroupResult')
@property
def pool(self):
"""Broker connection pool: :class:`~@pool`.
This attribute is not related to the workers concurrency pool.
"""
if self._pool is None:
self._ensure_after_fork()
limit = self.conf.broker_pool_limit
pools.set_limit(limit)
self._pool = pools.connections[self.connection_for_write()]
return self._pool
@property
def current_task(self):
"""The instance of the task that is being executed, or
:const:`None`."""
return _task_stack.top
@property
def current_worker_task(self):
"""The task currently being executed by a worker or :const:`None`.
Differs from :data:`current_task` in that it's not affected
by tasks calling other tasks directly, or eagerly.
"""
return get_current_worker_task()
@cached_property
def oid(self):
"""Universally unique identifier for this app."""
return oid_from(self)
@cached_property
def amqp(self):
"""AMQP related functionality: :class:`~@amqp`."""
return instantiate(self.amqp_cls, app=self)
@cached_property
def backend(self):
"""Current backend instance."""
return self._get_backend()
@property
def conf(self):
"""Current configuration."""
if self._conf is None:
self._conf = self._load_config()
return self._conf
def _get_from_conf_and_finalize(self, key):
conf = self._conf = self._load_config()
return conf[key]
@conf.setter
def conf(self, d): # noqa
self._conf = d
@cached_property
def control(self):
"""Remote control: :class:`~@control`."""
return instantiate(self.control_cls, app=self)
@cached_property
def events(self):
"""Consuming and sending events: :class:`~@events`."""
return instantiate(self.events_cls, app=self)
@cached_property
def loader(self):
"""Current loader instance."""
return get_loader_cls(self.loader_cls)(app=self)
@cached_property
def log(self):
"""Logging: :class:`~@log`."""
return instantiate(self.log_cls, app=self)
@cached_property
def canvas(self):
from celery import canvas
return canvas
@cached_property
def tasks(self):
"""Task registry.
Accessing this attribute will also finalize the app.
"""
self.finalize(auto=True)
return self._tasks
@property
def producer_pool(self):
return self.amqp.producer_pool
@cached_property
def timezone(self):
"""Current timezone for this app.
This is a cached property taking the time zone from the
:setting:`timezone` setting.
"""
conf = self.conf
tz = conf.timezone
if not tz:
return (timezone.get_timezone('UTC') if conf.enable_utc
else timezone.local)
return timezone.get_timezone(conf.timezone)
def __init__(self,
main=None,
loader=None,
backend=None,
amqp=None,
events=None,
log=None,
control=None,
set_as_current=True,
tasks=None,
broker=None,
include=None,
changes=None,
config_source=None,
fixups=None,
task_cls=None,
autofinalize=True,
**kwargs):
self.clock = LamportClock()
self.main = main
self.amqp_cls = amqp or self.amqp_cls
self.events_cls = events or self.events_cls
self.loader_cls = loader or self.loader_cls
self.log_cls = log or self.log_cls
self.control_cls = control or self.control_cls
self.task_cls = task_cls or self.task_cls
self.set_as_current = set_as_current
self.registry_cls = symbol_by_name(self.registry_cls)
self.user_options = defaultdict(set)
self.steps = defaultdict(set)
self.autofinalize = autofinalize
self.configured = False
self._config_source = config_source
self._pending_defaults = deque()
self._pending_periodic_tasks = deque()
self.finalized = False
self._finalize_mutex = threading.Lock()
self._pending = deque()
self._tasks = tasks
if not isinstance(self._tasks, TaskRegistry):
self._tasks = TaskRegistry(self._tasks or {})
# If the class defines a custom __reduce_args__ we need to use
# the old way of pickling apps, which is pickling a list of
# args instead of the new way that pickles a dict of keywords.
self._using_v1_reduce = app_has_custom(self, '__reduce_args__')
# these options are moved to the config to
# simplify pickling of the app object.
self._preconf = changes or {}
if broker:
self._preconf['BROKER_URL'] = broker
if backend:
self._preconf['CELERY_RESULT_BACKEND'] = backend
if include:
self._preconf['CELERY_IMPORTS'] = include
# - Apply fixups.
self.fixups = set(self.builtin_fixups) if fixups is None else fixups
# ...store fixup instances in _fixups to keep weakrefs alive.
self._fixups = [symbol_by_name(fixup)(self) for fixup in self.fixups]
if self.set_as_current:
self.set_current()
# Signals
if self.on_configure is None:
# used to be a method pre 3.2
self.on_configure = Signal()
self.on_after_configure = Signal()
self.on_after_finalize = Signal()
self.on_init()
_register_app(self)
gc.collect()
def receiver_1_arg(val, **kwargs):
return val
class Callable(object):
def __call__(self, val, **kwargs):
return val
def a(self, val, **kwargs):
return val
a_signal = Signal(providing_args=['val'], use_caching=False)
class test_Signal:
"""Test suite for dispatcher (barely started)"""
def _testIsClean(self, signal):
"""Assert that everything has been cleaned up automatically"""
assert not signal.has_listeners()
assert signal.receivers == []
def test_exact(self):
a_signal.connect(receiver_1_arg, sender=self)
try:
expected = [(receiver_1_arg, 'test')]
result = a_signal.send(sender=self, val='test')
assert result == expected
from celery.utils.dispatch import Signal
task_sent = Signal(
providing_args=["task_id", "task", "args", "kwargs", "eta", "taskset"])
task_prerun = Signal(providing_args=["task_id", "task", "args", "kwargs"])
task_postrun = Signal(
providing_args=["task_id", "task", "args", "kwargs", "retval"])
worker_init = Signal(providing_args=[])
worker_process_init = Signal(providing_args=[])
worker_ready = Signal(providing_args=[])
worker_shutdown = Signal(providing_args=[])
setup_logging = Signal(
providing_args=["loglevel", "logfile", "format", "colorize"])