Update celery to 4.2.0

[pyup-bot]

This PR updates celery from 4.1.0 to 4.2.0.

Changelog

4.2.0

=====
:release-date: 2018-06-10 21:30 PM IST
:release-by: Omer Katz

- **Task**: Add ``ignore_result`` as task execution option (4709, 3834)

 Contributed by **Andrii Kostenko** and **George Psarakis**.

- **Redis Result Backend**: Do not create PubSub subscriptions when results are ignored (4709, 3834)

 Contributed by **Andrii Kostenko** and **George Psarakis**.

- **Redis Result Backend**: Result consumer always unsubscribes when task state is ready (4666)

 Contributed by **George Psarakis**.

- **Development/Testing**: Add docker-compose and base Dockerfile for development (4482)

 Contributed by **Chris Mitchell**.

- **Documentation/Sphinx**: Teach autodoc to document tasks if undoc-members is not set (4588)

 Contributed by **Leo Singer**.

- **Documentation/Sphinx**: Put back undoc-members option in sphinx test (4586)

 Contributed by **Leo Singer**.

- **Documentation/Sphinx**: Sphinx autodoc picks up tasks automatically only if `undoc-members` is set (4584)

 Contributed by **Leo Singer**.

- **Task**: Fix shadow_name issue when using previous version Task class (4572)

 Contributed by :github_user:`pachewise`.

- **Task**: Add support for bound tasks as `link_error` parameter (Fixes 3723) (4545)

 Contributed by :github_user:`brabiega`.

- **Deployment**: Add a command line option for setting the Result Backend URL (4549)

 Contributed by :github_user:`y0ngdi`.

- **CI**: Enable pip cache in appveyor build (4546)

 Contributed by **Thijs Triemstra**.

- **Concurrency/Asynpool**: Fix errno property name shadowing.

 Contributed by **Omer Katz**.

- **DynamoDB Backend**: Configurable endpoint URL (4532)

 Contributed by **Bohdan Rybak**.

- **Timezones**: Correctly detect UTC timezone and timezone from settings (Fixes 4517) (4519)

 Contributed by :github_user:`last-partizan`.

- **Control**: Cleanup the mailbox's producer pool after forking (4472)

 Contributed by **Nick Eaket**.

- **Documentation**: Start Celery and Celery Beat on Azure WebJob (4484)

 Contributed by **PauloPeres**.

- **Celery Beat**: Schedule due tasks on startup, after Beat restart has occurred (4493)

 Contributed by **Igor Kasianov**.

- **Worker**: Use absolute time when task is accepted by worker pool (3684)

 Contributed by **Régis Behmo**.

- **Canvas**: Propagate arguments to chains inside groups (4481)

 Contributed by **Chris Mitchell**.

- **Canvas**: Fix `Task.replace` behavior in nested chords (fixes 4368) (4369)

 Contributed by **Denis Shirokov** & **Alex Hill**.

- **Installation**: Pass python_requires argument to setuptools (4479)

 Contributed by **Jon Dufresne**.

- **Message Protocol Compatibility**: Handle "hybrid" messages that have moved between Celery versions (4358) (Issue 4356)

 Contributed by **Russell Keith-Magee**.

- **Canvas**: request on_timeout now ignores soft time limit exception (fixes 4412) (4473)

 Contributed by **Alex Garel**.

- **Redis Result Backend**: Integration test to verify PubSub unsubscriptions (4468)

 Contributed by **George Psarakis**.

- **Message Protocol Properties**: Allow the shadow keyword argument and the shadow_name method to set shadow properly (4381)

 Contributed by :github_user:`hclihn`.

- **Canvas**: Run chord_unlock on same queue as chord body (4448) (Issue 4337)

 Contributed by **Alex Hill**.

- **Canvas**: Support chords with empty header group (4443)

 Contributed by **Alex Hill**.

- **Timezones**: make astimezone call in localize more safe (4324)

 Contributed by **Matt Davis**.

- **Canvas**: Fix length-1 and nested chords (4437) (Issues 4393, 4055, 3885, 3597, 3574, 3323, 4301)

 Contributed by **Alex Hill**.

- **CI**: Run `Openstack Bandit <https://pypi.org/project/bandit/1.0.1/>`_ in Travis CI in order to detect security issues.

 Contributed by **Omer Katz**.

- **CI**: Run `isort <https://github.com/timothycrosley/isort>`_ in Travis CI in order to lint Python **import** statements.

 Contributed by **Omer Katz**.

- **Canvas**: Resolve TypeError on `.get` from nested groups (4432) (Issue 4274)

 Contributed by **Misha Wolfson**.

- **CouchDB Backend**: Correct CouchDB key string type for Python 2/3 compatibility (4166)

 Contributed by :github_user:`fmind` && **Omer Katz**.

- **Group Result**: Fix current_app fallback in GroupResult.restore() (4431)

 Contributed by **Alex Hill**.

- **Consul Backend**: Correct key string type for Python 2/3 compatibility (4416)

 Contributed by **Wido den Hollander**.

- **Group Result**: Correctly restore an empty GroupResult (2202) (4427)

 Contributed by **Alex Hill** & **Omer Katz**.

- **Result**: Disable synchronous waiting for sub-tasks on eager mode(4322)

 Contributed by **Denis Podlesniy**.

- **Celery Beat**: Detect timezone or Daylight Saving Time changes (1604) (4403)

 Contributed by **Vincent Barbaresi**.

- **Canvas**: Fix append to an empty chain. Fixes 4047. (4402)

 Contributed by **Omer Katz**.

- **Task**: Allow shadow to override task name in trace and logging messages. (4379)

 Contributed by :github_user:`hclihn`.

- **Documentation/Sphinx**: Fix getfullargspec Python 2.x compatibility in contrib/sphinx.py (4399)

 Contributed by **Javier Martin Montull**.

- **Documentation**: Updated installation instructions for SQS broker (4382)

 Contributed by **Sergio Fernandez**.

- **Celery Beat**: Better equality comparison for ScheduleEntry instances (4312)

 Contributed by :github_user:`mariia-zelenova`.

- **Task**: Adding 'shadow' property to as_task_v2 (4350)

 Contributed by **Marcelo Da Cruz Pinto**.

- Try to import directly, do not use deprecated imp method (4216)

 Contributed by **Tobias Kunze**.

- **Task**: Enable `kwargsrepr` and `argsrepr` override for modifying task argument representation (4260)

 Contributed by **James M. Allen**.

- **Result Backend**: Add Redis Sentinel backend (4144)

 Contributed by **Geoffrey Bauduin**.

- Use unique time values for Collections/LimitedSet (3879 and 3891) (3892)

 Contributed by :github_user:`lead2gold`.

- **CI**: Report coverage for all result backends.

 Contributed by **Omer Katz**.

- **Django**: Use Django DB max age connection setting (fixes 4116) (4292)

 Contributed by **Marco Schweighauser**.

- **Canvas**: Properly take into account chain tasks link_error (4240)

 Contributed by :github_user:`agladkov`.

- **Canvas**: Allow to create group with single task (fixes issue 4255) (4280)

 Contributed by :github_user:`agladkov`.

- **Canvas**: Copy dictionary parameter in chord.from_dict before modifying (fixes issue 4223) (4278)

 Contributed by :github_user:`agladkov`.

- **Results Backend**: Add Cassandra options (4224)

 Contributed by **Scott Cooper**.

- **Worker**: Apply rate limiting for tasks with ETA (4251)

 Contributed by :github_user:`arpanshah29`.

- **Celery Beat**: support scheduler entries without a schedule (4235)

 Contributed by **Markus Kaiserswerth**.

- **SQS Broker**: Updated SQS requirements file with correct boto3 version (4231)

 Contributed by **Alejandro Varas**.

- Remove unused code from _create_app contextmanager (4204)

 Contributed by **Ryan P Kilby**.

- **Group Result**: Modify GroupResult.as_tuple() to include parent (fixes 4106) (4205)

 Contributed by :github_user:`pachewise`.

- **Beat**: Set default scheduler class in beat command. (4189)

 Contributed by :github_user:`Kxrr`.

- **Worker**: Retry signal receiver after raised exception (4192)

 Contributed by **David Davis**.

- **Task**: Allow custom Request class for tasks (3977)

 Contributed by **Manuel Vázquez Acosta**.

- **Django**: Django fixup should close all cache backends (4187)

 Contributed by **Raphaël Riel**.

- **Deployment**: Adds stopasgroup to the supervisor scripts (4200)

 Contributed by :github_user:`martialp`.

- Using Exception.args to serialize/deserialize exceptions (4085)

 Contributed by **Alexander Ovechkin**.

- **Timezones**: Correct calculation of application current time with timezone (4173)

 Contributed by **George Psarakis**.

- **Remote Debugger**: Set the SO_REUSEADDR option on the socket (3969)

 Contributed by **Theodore Dubois**.

- **Django**: Celery ignores exceptions raised during `django.setup()` (4146)

 Contributed by **Kevin Gu**.

- Use heartbeat setting from application configuration for Broker connection (4148)

 Contributed by :github_user:`mperice`.

- **Celery Beat**: Fixed exception caused by next_transit receiving an unexpected argument. (4103)

 Contributed by **DDevine**.

- **Task** Introduce exponential backoff with Task auto-retry (4101)

 Contributed by **David Baumgold**.

- **AsyncResult**: Remove weak-references to bound methods in AsyncResult promises. (4131)

 Contributed by **Vinod Chandru**.

- **Development/Testing**: Allow eager application of canvas structures (4576)

 Contributed by **Nicholas Pilon**.

- **Command Line**: Flush stderr before exiting with error code 1.

 Contributed by **Antonin Delpeuch**.

- **Task**: Escapes single quotes in kwargsrepr strings.

 Contributed by **Kareem Zidane**

- **AsyncResult**: Restore ability to join over ResultSet after fixing celery/3818.

 Contributed by **Derek Harland**

- **Redis Results Backend**: Unsubscribe on message success.

Previously Celery would leak channels, filling the memory of the Redis instance.

Contributed by **George Psarakis**

- **Task**: Only convert eta to isoformat when it is not already a string.

Contributed by **Omer Katz**

- **Redis Results Backend**: The result_backend setting now supports rediss:// URIs

Contributed by **James Remeika**

- **Canvas** Keyword arguments are passed to tasks in chain as expected.

Contributed by :github_user:`tothegump`

- **Django** Fix a regression casuing Celery to crash when using Django.

Contributed by **Jonas Haag**

- **Canvas** Chain with one task now runs as expected.

Contributed by :github_user:`tothegump`

- **Kombu** Celery 4.2 now requires Kombu 4.2 or better.

Contributed by **Omer Katz & Asif Saifuddin Auvi**

- `GreenletExit` is not in `__all__` in greenlet.py which can not be imported by Python 3.6.

The import was adjusted to work on Python 3.6 as well.

Contributed by **Hsiaoming Yang**

- Fixed a regression that occured during the development of Celery 4.2 which caused `celery report` to crash when Django is installed.

Contributed by **Josue Balandrano Coronel**

- Matched the behavior of `GroupResult.as_tuple()` to that of `AsyncResult.as_tuple()`.

The group's parent is now serialized correctly.

Contributed by **Josue Balandrano Coronel**

- Use Redis coercion mechanism for converting URI query parameters.

Contributed by **Justin Patrin**

- Fixed the representation of `GroupResult`.

The dependency graph is now presented correctly.

Contributed by **Josue Balandrano Coronel**

Documentation, CI, Installation and Tests fixes:


 - **Sammie S. Taunton**
 - **Dan Wilson**
 - :github_user:`pachewise`
 - **Sergi Almacellas Abellana**
 - **Omer Katz**
 - **Alex Zaitsev**
 - **Leo Singer**
 - **Rachel Johnson**
 - **Jon Dufresne**
 - **Samuel Dion-Girardeau**
 - **Ryan Guest**
 - **Huang Huang**
 - **Geoffrey Bauduin**
 - **Andrew Wong**
 - **Mads Jensen**
 - **Jackie Leng**
 - **Harry Moreno**
 - :github_user:`michael-k`
 - **Nicolas Mota**
 - **Armenak Baburyan**
 - **Patrick Zhang**
 - :github_user:`anentropic`
 - :github_user:`jairojair`
 - **Ben Welsh**
 - **Michael Peake**
 - **Fengyuan Chen**
 - :github_user:`arpanshah29`
 - **Xavier Hardy**
 - **Shitikanth**
 - **Igor Kasianov**
 - **John Arnold**
 - :github_user:`dmollerm`
 - **Robert Knight**
 - **Asif Saifuddin Auvi**
 - **Eduardo Ramírez**
 - **Kamil Breguła**
 - **Juan Gutierrez**


Change log

Links

• PyPI: https://pypi.org/project/celery
• Changelog: https://pyup.io/changelogs/celery/
• Homepage: http://celeryproject.org
• Docs: https://pythonhosted.org/celery/