/usr/share/pyshared/celery/task/control.py is in python-celery 2.4.6-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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"""
celery.task.control
~~~~~~~~~~~~~~~~~~~
Client for worker remote control commands.
Server implementation is in :mod:`celery.worker.control`.
:copyright: (c) 2009 - 2011 by Ask Solem.
:license: BSD, see LICENSE for more details.
"""
from __future__ import absolute_import
from __future__ import with_statement
from kombu.pidbox import Mailbox
from ..app import app_or_default
def flatten_reply(reply):
nodes = {}
for item in reply:
nodes.update(item)
return nodes
class Inspect(object):
def __init__(self, control, destination=None, timeout=1, callback=None,):
self.destination = destination
self.timeout = timeout
self.callback = callback
self.control = control
def _prepare(self, reply):
if not reply:
return
by_node = flatten_reply(reply)
if self.destination and \
not isinstance(self.destination, (list, tuple)):
return by_node.get(self.destination)
return by_node
def _request(self, command, **kwargs):
return self._prepare(self.control.broadcast(command,
arguments=kwargs,
destination=self.destination,
callback=self.callback,
timeout=self.timeout, reply=True))
def active(self, safe=False):
return self._request("dump_active", safe=safe)
def scheduled(self, safe=False):
return self._request("dump_schedule", safe=safe)
def reserved(self, safe=False):
return self._request("dump_reserved", safe=safe)
def stats(self):
return self._request("stats")
def revoked(self):
return self._request("dump_revoked")
def registered(self):
return self._request("dump_tasks")
def enable_events(self):
return self._request("enable_events")
def disable_events(self):
return self._request("disable_events")
def ping(self):
return self._request("ping")
def add_consumer(self, queue, exchange=None, exchange_type="direct",
routing_key=None, **options):
return self._request("add_consumer", queue=queue, exchange=exchange,
exchange_type=exchange_type,
routing_key=routing_key, **options)
def cancel_consumer(self, queue, **kwargs):
return self._request("cancel_consumer", queue=queue, **kwargs)
def active_queues(self):
return self._request("active_queues")
registered_tasks = registered
class Control(object):
Mailbox = Mailbox
def __init__(self, app):
self.app = app
self.mailbox = self.Mailbox("celeryd", type="fanout")
def inspect(self, destination=None, timeout=1, callback=None):
return Inspect(self, destination=destination, timeout=timeout,
callback=callback)
def discard_all(self, connection=None, connect_timeout=None):
"""Discard all waiting tasks.
This will ignore all tasks waiting for execution, and they will
be deleted from the messaging server.
:returns: the number of tasks discarded.
"""
with self.app.default_connection(connection, connect_timeout) as conn:
return self.app.amqp.get_task_consumer(connection=conn)\
.discard_all()
def revoke(self, task_id, destination=None, terminate=False,
signal="SIGTERM", **kwargs):
"""Revoke a task by id.
If a task is revoked, the workers will ignore the task and
not execute it after all.
:param task_id: Id of the task to revoke.
:keyword terminate: Also terminate the process currently working
on the task (if any).
:keyword signal: Name of signal to send to process if terminate.
Default is TERM.
:keyword destination: If set, a list of the hosts to send the
command to, when empty broadcast to all workers.
:keyword connection: Custom broker connection to use, if not set,
a connection will be established automatically.
:keyword connect_timeout: Timeout for new connection if a custom
connection is not provided.
:keyword reply: Wait for and return the reply.
:keyword timeout: Timeout in seconds to wait for the reply.
:keyword limit: Limit number of replies.
"""
return self.broadcast("revoke", destination=destination,
arguments={"task_id": task_id,
"terminate": terminate,
"signal": signal}, **kwargs)
def ping(self, destination=None, timeout=1, **kwargs):
"""Ping workers.
Returns answer from alive workers.
:keyword destination: If set, a list of the hosts to send the
command to, when empty broadcast to all workers.
:keyword connection: Custom broker connection to use, if not set,
a connection will be established automatically.
:keyword connect_timeout: Timeout for new connection if a custom
connection is not provided.
:keyword reply: Wait for and return the reply.
:keyword timeout: Timeout in seconds to wait for the reply.
:keyword limit: Limit number of replies.
"""
return self.broadcast("ping", reply=True, destination=destination,
timeout=timeout, **kwargs)
def rate_limit(self, task_name, rate_limit, destination=None, **kwargs):
"""Set rate limit for task by type.
:param task_name: Name of task to change rate limit for.
:param rate_limit: The rate limit as tasks per second, or a rate limit
string (`"100/m"`, etc.
see :attr:`celery.task.base.Task.rate_limit` for
more information).
:keyword destination: If set, a list of the hosts to send the
command to, when empty broadcast to all workers.
:keyword connection: Custom broker connection to use, if not set,
a connection will be established automatically.
:keyword connect_timeout: Timeout for new connection if a custom
connection is not provided.
:keyword reply: Wait for and return the reply.
:keyword timeout: Timeout in seconds to wait for the reply.
:keyword limit: Limit number of replies.
"""
return self.broadcast("rate_limit", destination=destination,
arguments={"task_name": task_name,
"rate_limit": rate_limit},
**kwargs)
def time_limit(self, task_name, soft=None, hard=None, **kwargs):
"""Set time limits for task by type.
:param task_name: Name of task to change time limits for.
:keyword soft: New soft time limit (in seconds).
:keyword hard: New hard time limit (in seconds).
Any additional keyword arguments are passed on to :meth:`broadcast`.
"""
return self.broadcast("time_limit",
arguments={"task_name": task_name,
"hard": hard, "soft": soft},
**kwargs)
def broadcast(self, command, arguments=None, destination=None,
connection=None, connect_timeout=None, reply=False, timeout=1,
limit=None, callback=None, channel=None):
"""Broadcast a control command to the celery workers.
:param command: Name of command to send.
:param arguments: Keyword arguments for the command.
:keyword destination: If set, a list of the hosts to send the
command to, when empty broadcast to all workers.
:keyword connection: Custom broker connection to use, if not set,
a connection will be established automatically.
:keyword connect_timeout: Timeout for new connection if a custom
connection is not provided.
:keyword reply: Wait for and return the reply.
:keyword timeout: Timeout in seconds to wait for the reply.
:keyword limit: Limit number of replies.
:keyword callback: Callback called immediately for each reply
received.
"""
with self.app.default_connection(connection, connect_timeout) as conn:
if channel is None:
channel = conn.default_channel
return self.mailbox(conn)._broadcast(command, arguments,
destination, reply, timeout,
limit, callback,
channel=channel)
_default_control = Control(app_or_default())
broadcast = _default_control.broadcast
rate_limit = _default_control.rate_limit
time_limit = _default_control.time_limit
ping = _default_control.ping
revoke = _default_control.revoke
discard_all = _default_control.discard_all
inspect = _default_control.inspect
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