Django实现celery定时任务过程解析

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:guest@localhost: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'

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