def apply_async(self,
args=None,
kwargs=None,
task_id=None,
producer=None,
link=None,
link_error=None,
shadow=None,
**options):
"""Apply tasks asynchronously by sending a message.
Arguments:
args (Tuple): The positional arguments to pass on to the task.
kwargs (Dict): The keyword arguments to pass on to the task.
countdown (float): Number of seconds into the future that the
task should execute. Defaults to immediate execution.
eta (~datetime.datetime): Absolute time and date of when the task
should be executed. May not be specified if `countdown`
is also supplied.
expires (float, ~datetime.datetime): Datetime or
seconds in the future for the task should expire.
The task won't be executed after the expiration time.
shadow (str): Override task name used in logs/monitoring.
Default is retrieved from :meth:`shadow_name`.
connection (kombu.Connection): Re-use existing broker connection
instead of acquiring one from the connection pool.
retry (bool): If enabled sending of the task message will be
retried in the event of connection loss or failure.
Default is taken from the :setting:`task_publish_retry`
setting. Note that you need to handle the
producer/connection manually for this to work.
retry_policy (Mapping): Override the retry policy used.
See the :setting:`task_publish_retry_policy` setting.
queue (str, kombu.Queue): The queue to route the task to.
This must be a key present in :setting:`task_queues`, or
:setting:`task_create_missing_queues` must be
enabled. See :ref:`guide-routing` for more
information.
exchange (str, kombu.Exchange): Named custom exchange to send the
task to. Usually not used in combination with the ``queue``
argument.
routing_key (str): Custom routing key used to route the task to a
worker server. If in combination with a ``queue`` argument
only used to specify custom routing keys to topic exchanges.
priority (int): The task priority, a number between 0 and 9.
Defaults to the :attr:`priority` attribute.
serializer (str): Serialization method to use.
Can be `pickle`, `json`, `yaml`, `msgpack` or any custom
serialization method that's been registered
with :mod:`kombu.serialization.registry`.
Defaults to the :attr:`serializer` attribute.
compression (str): Optional compression method
to use. Can be one of ``zlib``, ``bzip2``,
or any custom compression methods registered with
:func:`kombu.compression.register`.
Defaults to the :setting:`task_compression` setting.
link (Signature): A single, or a list of tasks signatures
to apply if the task returns successfully.
link_error (Signature): A single, or a list of task signatures
to apply if an error occurs while executing the task.
producer (kombu.Producer): custom producer to use when publishing
the task.
add_to_parent (bool): If set to True (default) and the task
is applied while executing another task, then the result
will be appended to the parent tasks ``request.children``
attribute. Trailing can also be disabled by default using the
:attr:`trail` attribute
publisher (kombu.Producer): Deprecated alias to ``producer``.
headers (Dict): Message headers to be included in the message.
Returns:
celery.result.AsyncResult: Promise of future evaluation.
Raises:
TypeError: If not enough arguments are passed, or too many
arguments are passed. Note that signature checks may
be disabled by specifying ``@task(typing=False)``.
kombu.exceptions.OperationalError: If a connection to the
transport cannot be made, or if the connection is lost.
Note:
Also supports all keyword arguments supported by
:meth:`kombu.Producer.publish`.
"""
if self.typing:
try:
check_arguments = self.__header__
except AttributeError: # pragma: no cover
pass
else:
check_arguments(*(args or ()), **(kwargs or {}))
app = self._get_app()
if app.conf.task_always_eager:
with app.producer_or_acquire(producer) as eager_producer:
serializer = options.get(
'serializer',
(eager_producer.serializer if eager_producer.serializer
else app.conf.task_serializer))
body = args, kwargs
content_type, content_encoding, data = serialization.dumps(
body,
serializer,
)
args, kwargs = serialization.loads(data,
content_type,
content_encoding,
accept=[content_type])
with denied_join_result():
return self.apply(args,
kwargs,
task_id=task_id or uuid(),
link=link,
link_error=link_error,
**options)
if self.__v2_compat__:
shadow = shadow or self.shadow_name(self(), args, kwargs, options)
else:
shadow = shadow or self.shadow_name(args, kwargs, options)
preopts = self._get_exec_options()
options = dict(preopts, **options) if options else preopts
options.setdefault('ignore_result', self.ignore_result)
if self.priority:
options.setdefault('priority', self.priority)
return app.send_task(self.name,
args,
kwargs,
task_id=task_id,
producer=producer,
link=link,
link_error=link_error,
result_cls=self.AsyncResult,
shadow=shadow,
task_type=self,
**options)
def apply_async(self, args=None, kwargs=None, task_id=None, producer=None,
link=None, link_error=None, shadow=None, **options):
"""Apply tasks asynchronously by sending a message.
Arguments:
args (Tuple): The positional arguments to pass on to the task.
kwargs (Dict): The keyword arguments to pass on to the task.
countdown (float): Number of seconds into the future that the
task should execute. Defaults to immediate execution.
eta (~datetime.datetime): Absolute time and date of when the task
should be executed. May not be specified if `countdown`
is also supplied.
expires (float, ~datetime.datetime): Datetime or
seconds in the future for the task should expire.
The task won't be executed after the expiration time.
shadow (str): Override task name used in logs/monitoring.
Default is retrieved from :meth:`shadow_name`.
connection (kombu.Connection): Re-use existing broker connection
instead of acquiring one from the connection pool.
retry (bool): If enabled sending of the task message will be
retried in the event of connection loss or failure.
Default is taken from the :setting:`task_publish_retry`
setting. Note that you need to handle the
producer/connection manually for this to work.
retry_policy (Mapping): Override the retry policy used.
See the :setting:`task_publish_retry_policy` setting.
queue (str, kombu.Queue): The queue to route the task to.
This must be a key present in :setting:`task_queues`, or
:setting:`task_create_missing_queues` must be
enabled. See :ref:`guide-routing` for more
information.
exchange (str, kombu.Exchange): Named custom exchange to send the
task to. Usually not used in combination with the ``queue``
argument.
routing_key (str): Custom routing key used to route the task to a
worker server. If in combination with a ``queue`` argument
only used to specify custom routing keys to topic exchanges.
priority (int): The task priority, a number between 0 and 9.
Defaults to the :attr:`priority` attribute.
serializer (str): Serialization method to use.
Can be `pickle`, `json`, `yaml`, `msgpack` or any custom
serialization method that's been registered
with :mod:`kombu.serialization.registry`.
Defaults to the :attr:`serializer` attribute.
compression (str): Optional compression method
to use. Can be one of ``zlib``, ``bzip2``,
or any custom compression methods registered with
:func:`kombu.compression.register`.
Defaults to the :setting:`task_compression` setting.
link (~@Signature): A single, or a list of tasks signatures
to apply if the task returns successfully.
link_error (~@Signature): A single, or a list of task signatures
to apply if an error occurs while executing the task.
producer (kombu.Producer): custom producer to use when publishing
the task.
add_to_parent (bool): If set to True (default) and the task
is applied while executing another task, then the result
will be appended to the parent tasks ``request.children``
attribute. Trailing can also be disabled by default using the
:attr:`trail` attribute
publisher (kombu.Producer): Deprecated alias to ``producer``.
headers (Dict): Message headers to be included in the message.
Returns:
celery.result.AsyncResult: Promise of future evaluation.
Raises:
TypeError: If not enough arguments are passed, or too many
arguments are passed. Note that signature checks may
be disabled by specifying ``@task(typing=False)``.
kombu.exceptions.OperationalError: If a connection to the
transport cannot be made, or if the connection is lost.
Note:
Also supports all keyword arguments supported by
:meth:`kombu.Producer.publish`.
"""
if self.typing:
try:
check_arguments = self.__header__
except AttributeError: # pragma: no cover
pass
else:
check_arguments(*(args or ()), **(kwargs or {}))
app = self._get_app()
if app.conf.task_always_eager:
with denied_join_result():
return self.apply(args, kwargs, task_id=task_id or uuid(),
link=link, link_error=link_error, **options)
# add 'self' if this is a "task_method".
if self.__self__ is not None:
args = args if isinstance(args, tuple) else tuple(args or ())
args = (self.__self__,) + args
shadow = shadow or self.shadow_name(args, kwargs, options)
preopts = self._get_exec_options()
options = dict(preopts, **options) if options else preopts
return app.send_task(
self.name, args, kwargs, task_id=task_id, producer=producer,
link=link, link_error=link_error, result_cls=self.AsyncResult,
shadow=shadow, task_type=self,
**options
)
