python Celery定时任务的示例

#每30秒调用task.add
from datetime import timedelta

CELERYBEAT_SCHEDULE = {
  'add-every-30-seconds': {
    'task': 'tasks.add',
    'schedule': timedelta(seconds=30),
    'args': (16, 16)
  },
}

#crontab任务
#每周一7:30调用task.add
from celery.schedules import crontab

CELERYBEAT_SCHEDULE = {
  # Executes every Monday morning at 7:30 A.M
  'add-every-monday-morning': {
    'task': 'tasks.add',
    'schedule': crontab(hour=7, minute=30, day_of_week=1),
    'args': (16, 16),
  },
}

import datetime
import json
from djcelery import models as celery_models
from django.utils import timezone
#创建任务
def create_task(name, task, task_args, crontab_time):
  '''
  name # 任务名字
  task # 执行的任务 "myapp.tasks.add"
  task_args # 任务参数 {"x":1, "Y":1}

  crontab_time # 定时任务时间 格式：
  {
    'month_of_year': 9 # 月份
    'day_of_month': 5 # 日期
    'hour': 01 # 小时
    'minute':05 # 分钟
  }
  '''

  # task任务， created是否定时创建
  task, created = celery_models.PeriodicTask.objects.
              get_or_create(name=name,task=task)
  # 获取 crontab
  crontab = celery_models.CrontabSchedule.objects.
              filter(**crontab_time).first()
  if crontab is None:
  # 如果没有就创建，有的话就继续复用之前的crontab
    crontab = celery_models.CrontabSchedule.objects.
              create(**crontab_time)
  task.crontab = crontab # 设置crontab
  task.enabled = True # 开启task
  task.kwargs = json.dumps(task_args) # 传入task参数
  expiration = timezone.now() + datetime.timedelta(day=1)
  task.expires = expiration # 设置任务过期时间为现在时间的一天以后
  task.save()
  return True 

#关闭任务
def disable_task(name):
'''
关闭任务
'''
  try:
    task = celery_models.PeriodicTask.objects.get(name=name)
    task.enabled = False # 设置关闭
    task.save()
    return True
  except celery_models.PeriodicTask.DoesNotExist:
    return True

python manage.py celery beat --loglevel=info

python manage.py celery worker --loglevel=info --beat

from djcelery import models as celery_models
from django.utils import timezone
@task()
def delete():
  '''
  删除任务
  从models中过滤出过期时间小于现在的时间然后删除
  '''
  return celery_models.PeriodicTask.objects.filter(
              expires__lt=timezone.now()).delete()