Django-如何写好一个celery定时任务
1.首先在项目同名目录下建一个celery.py
from __future__ import absolute_import
import os
from celery import Celery
from datetime import timedelta
from kombu import Queue
# set the default Django settings module for the ‘celery‘ program.
os.environ.setdefault(‘DJANGO_SETTINGS_MODULE‘, ‘OpsManage.settings‘)from django.conf import settings
app = Celery(‘OpsManage‘)
# Using a string here means the worker will not have to
# pickle the object when using Windows.
# 配置celery
class Config:
BROKER_URL = ‘amqp://guest::5672//‘
CELERY_RESULT_BACKEND = ‘redis://localhost:6379‘
CELERY_ACCEPT_CONTENT = [‘application/json‘]
CELERY_TASK_SERIALIZER = ‘json‘
CELERY_RESULT_SERIALIZER = ‘json‘
CELERY_TASK_RESULT_EXPIRES = 60 * 60
CELERY_TIMEZONE = ‘Asia/Shanghai‘
CELERY_ENABLE_UTC = True
CELERY_ANNOTATIONS = {‘*‘: {‘rate_limit‘: ‘500/s‘}}
CELERYBEAT_SCHEDULER = ‘djcelery.schedulers.DatabaseScheduler‘
app.config_from_object(Config)
# 到各个APP里自动发现tasks.py文件
app.autodiscover_tasks()
#crontab config
app.conf.update(
CELERYBEAT_SCHEDULE = {
# 每隔30s执行一次函数
‘every-30-min-add‘: {
‘task‘: ‘apps.tasks.celery_assets.push_host_by_salt_tasks‘,
‘schedule‘: timedelta(seconds=30)
# # 每天凌晨12点
# ‘schedule‘: crontab(minute=0, hour=0)
},
},
)
# kombu : Celery 自带的用来收发消息的库, 提供了符合 Python 语言习惯的, 使用 AMQP 协议的高级接口
Queue(‘transient‘, routing_key=‘transient‘,delivery_mode=1)2.在settings.py里配置celery
INSTALLED_APPS = [
......
‘django_celery_beat‘,
‘django_celery_results‘,
]3.在项目同名目录下的__init__.py文件里申明celery任务，记得要去检测呀
# coding:utf-8 from __future__ import absolute_import, unicode_literals # This will make sure the app is always imported when # Django starts so that shared_task will use this app. from celery import app as celery_app __all__ = [‘celery_app‘] import pymysql pymysql.install_as_MySQLdb()
4.在task.py里执行任务的函数上加@
from celery import task
# 定时任务
@task
def push_host_by_salt_tasks():
“”“balabala”“”
return ‘这里是定时任务‘