python - 如何使用 celery-beat 启动任务？

Question

为什么我不能运行定期任务？

项目/settings.py

REDIS_HOST = 'localhost'
REDIS_PORT = '6379'
CELERY_BROKER_URL = 'redis://localhost:6379'
BROKER_URL = 'redis://' + REDIS_HOST + ':' + REDIS_PORT

CELERY_BEAT_SCHEDULE = {
    'task-first': {
        'task': 'app.tasks.one',
        'schedule': timedelta(seconds=1)
    },
    'task-second': {
        'task': 'app.tasks.two',
        'schedule': crontab(minute=0, hour='*/3,10-19')
    }
}

项目/ celery .py

os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'proj.settings')

app = Celery('proj')
app.config_from_object('django.conf:settings')

app.autodiscover_tasks(lambda: settings.INSTALLED_APPS)

项目/__init.py__

from .celery import app as celery_app

__all__ = ['celery_app']

celery -A proj worker -l 信息

[2019-10-31 16:57:57,906: INFO/MainProcess] Connected to redis://localhost:6379//
[2019-10-31 16:57:57,912: INFO/MainProcess] mingle: searching for neighbors
[2019-10-31 16:57:58,927: INFO/MainProcess] mingle: all alone
[2019-10-31 16:57:58,951: INFO/MainProcess] celery@lexvel-MS-7A72 ready.

找到任务

celery -A proj beat -l 信息

Configuration ->
    . broker -> redis://localhost:6379//
    . loader -> celery.loaders.app.AppLoader
    . scheduler -> celery.beat.PersistentScheduler
    . db -> celerybeat-schedule
    . logfile -> [stderr]@%INFO
    . maxinterval -> 5.00 minutes (300s)
[2019-10-31 16:58:02,851: INFO/MainProcess] beat: Starting...

celerybeat-shedule文件被创建。但除了这些行之外，什么也没有显示。

任务

@task()
def one():
    print('start 1', datetime.now())
    driver = init_driver()
    parse(driver)
    driver.close()
    driver.quit()
​
​
@task()
def two():
    print('start 2', datetime.now())
    driver = init_driver()
    parse2(driver)
    driver.close()
    driver.quit()
    print('end 2', datetime.now())

Answer 1

celery 节拍命令

celery -A proj worker -l info -B --scheduler django_celery_beat.schedulers:DatabaseScheduler

该命令用于启动 celery beat。

首先添加 django_celery_beat设置文件中已安装应用程序中的模块。

然后应用 django migrate命令，这将在管理面板中创建表。

完成 celery 文件中的所有过程并在 tasks.py 中创建任务后.

您将应用上面提到的 beat 命令。

项目/settings.py

INSTALLED_APPS = [

    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',

    'django_celery_beat',
]

REDIS_URL = "redis://localhost:6379/1"

CELERY_BROKER_URL=REDIS_URL

CELERY_RESULT_BACKEND=REDIS_URL

CELERY_ACCEPT_CONTENT = ['application/json']

CELERY_RESULT_SERIALIZER = 'json'

CELERY_TASK_SERIALIZER = 'json'

CELERY_BEAT_SCHEDULE = {

        'task-first': {
        'task': 'app.tasks.one',
        'schedule': timedelta(seconds=1)
       },
      'task-second': {
        'task': 'app.tasks.two',
        'schedule': crontab(minute=0, hour='*/3,10-19')
      }
}

项目/ celery .py

from celery import Celery

from django.conf import settings

os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'proj.settings')

app = Celery('proj')

app.config_from_object('django.conf:settings')

app.autodiscover_tasks(lambda: settings.INSTALLED_APPS)

项目/__init.py__

from .celery import app as celery_app

**__all__** = ['celery_app']