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celery_redis_win.md

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环境准备

windows下启动redirs server

  • redis-server.exe redis.windows.conf image.png

celery配置

  • 项目的settings.py文件修改:
# celery 设置
# celery中间人 redis://redis服务所在的ip地址:端口/数据库号
BROKER_URL = 'redis://127.0.0.1:6379/0'
# celery结果返回,可用于跟踪结果
CELERY_RESULT_BACKEND = 'redis://127.0.0.1:6379/0'

# celery内容等消息的格式设置
CELERY_ACCEPT_CONTENT = ['application/json', ]
CELERY_TASK_SERIALIZER = 'json'
CELERY_RESULT_SERIALIZER = 'json'

# celery时区设置,使用settings中TIME_ZONE同样的时区
CELERY_TIMEZONE = TIME_ZONE

  • 项目文件夹下添加celery.py文件:
# coding:utf-8
from __future__ import absolute_import, unicode_literals

from celery import Celery
from django.conf import settings
import os

# 获取当前文件夹名,即为该Django的项目名
project_name = os.path.split(os.path.abspath('.'))[-1]
project_settings = '%s.settings' % project_name

# 设置环境变量
os.environ.setdefault('DJANGO_SETTINGS_MODULE', project_settings)

# 实例化Celery,网上很多教程这里都是没有设置broker造成启动失败
app = Celery('tasks', broker='redis://127.0.0.1:6379/0')

# 使用django的settings文件配置celery
app.config_from_object('django.conf:settings')

# Celery加载所有注册的应用
app.autodiscover_tasks(lambda: settings.INSTALLED_APPS)

  • 项目的init.py文件修改:
# 引入celery实例对象
from __future__ import absolute_import, unicode_literals
from .celery import app as celery_app
__all__ = ['celery_app]

测试代码

  • 如:在app01(项目名)/tasks.py:
  • 关于task,并不是一定要把所有的task放在tasks.py,可以放在其他类里面,只要在函数上加@task即可
import time
from celery import task
@task
def add(a,b):
    print("这是任务开始")
    print(a+b)
    time.sleep(10)
    print("这是任务结束")
  • url配置如下:
    path('add', views.add, name="add")
  • view代码
from . import tasks
def add(request,*args,**kwargs):
    tasks.add.delay(1,2)
    result = {'code': 0, 'msg': '这是一个后台任务'}
    return JsonResponse(result)

再次配置

  • 在manger.py目录执行下面的代码,注意网上的资料大部分执行的命令有问题,造成启动报错,比如这个就是错误的,python manage.py celery -A celery worker --loglevel=info,请用下面的命令
celery -A djangoApi worker --pool=solo -l info
  • 启动项目,python manager.py runserver 0.0.0.0:8081

运行项目

  • 访问add image.png

  • 查看关键日志

[tasks]
  . api.base.BaseViewTask.task_run
  . api.tasks.add

[2019-04-07 13:26:02,855: INFO/MainProcess] Connected to redis://127.0.0.1:6379/0
[2019-04-07 13:26:02,869: INFO/MainProcess] mingle: searching for neighbors
[2019-04-07 13:26:03,911: INFO/MainProcess] mingle: all alone
[2019-04-07 13:26:03,926: WARNING/MainProcess] e:\app\python35\lib\site-packages\celery\fixups\django.py:202: UserWarning: Using settings.DEBUG leads to a memory leak, never use this setting in production environments!
  warnings.warn('Using settings.DEBUG leads to a memory leak, never '
[2019-04-07 13:26:03,926: INFO/MainProcess] celery@PC-20181208QWQO ready.
[2019-04-07 13:29:56,889: INFO/MainProcess] Received task: api.tasks.add[9fd98fd0-50ae-427f-8f33-52d1e4b43068]
[2019-04-07 13:29:56,894: WARNING/MainProcess] 这是任务开始
[2019-04-07 13:29:56,895: WARNING/MainProcess] 3
[2019-04-07 13:30:06,896: WARNING/MainProcess] 这是任务结束
[2019-04-07 13:30:06,898: INFO/MainProcess] Task api.tasks.add[9fd98fd0-50ae-427f-8f33-52d1e4b43068] succeeded in 10.0s: None

其他

  • 如何结合前端,如ajax来联合使用?
    • 表中我加了个extend字段,每次在执行耗时任务后,页面按钮根据extend字段值进行判断
    • 如1表示执行中,0表示没有执行,2执行完成,来判定按钮是否可以再次点击等