This document describes the current stable version of Celery (4.2). For development docs, go here.

celery.loaders.base

Loader base class.

class celery.loaders.base.BaseLoader(app, **kwargs)

Base class for loaders.

Loaders handles,

• Reading celery client/worker configurations.

• What happens when a task starts?

  See on_task_init().

• What happens when the worker starts?

  See on_worker_init().

• What happens when the worker shuts down?

  See on_worker_shutdown().

• What modules are imported to find tasks?

autodiscover_tasks(packages, related_name='tasks')

builtin_modules = frozenset()

cmdline_config_parser(args, namespace='celery', re_type=re.compile('\\((\\w+)\\)'), extra_types={'json': <function loads>}, override_types={'dict': 'json', 'list': 'json', 'tuple': 'json'})

conf

Loader configuration.

config_from_object(obj, silent=False)

configured = False

default_modules

find_module(module)

import_default_modules()

import_from_cwd(module, imp=None, package=None)

import_module(module, package=None)

import_task_module(module)

init_worker()

init_worker_process()

now(utc=True)

on_process_cleanup()

Called after a task is executed.

on_task_init(task_id, task)

Called before a task is executed.

on_worker_init()

Called when the worker (celery worker) starts.

on_worker_process_init()

Called when a child process starts.

on_worker_shutdown()

Called when the worker (celery worker) shuts down.

override_backends = {}

read_configuration(env='CELERY_CONFIG_MODULE')

shutdown_worker()

worker_initialized = False