django celery异步框架

描述：实现运维平台的异步执行与定时任务，以下简单描述了安装过程及使用。

安装django和celery

pip install django

pip install celery

pip install django-celery

新建一个项目名为news

root@bogon:~# django-admin startproject news

查看目录树

root@bogon:~# tree news/

news/

├── manage.py

└── news

├── __init__.py

├── settings.py

├── urls.py

└── wsgi.py

定义一个celery实例 news/news/celery.py

from __future__ import absolute_import

import os

from celery import Celery

# set the default Django settings module for the 'celery' program.

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

from django.conf import settings

app = Celery('news')

# Using a string here means the worker will not have to

# pickle the object when using Windows.

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

app.autodiscover_tasks(lambda: settings.INSTALLED_APPS)

@app.task(bind=True)

def debug_task(self):

  print('Request: {0!r}'.format(self.request))

在django中加载应用news/news/__init__.py

from __future__ import absolute_import

# 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

celery基本配置

import djcelery

djcelery.setup_loader()

BROKER_URL = 'django://'

# 以下为mq配置

# BROKER_URL = "amqp://guest:guest@localhost:5672//"

INSTALLED_APPS = (

  'djcelery',

  'kombu.transport.django',

)

celery队列配置以及详细说明

# 以下是标准的redis配置

BROKER_URL = 'redis://localhost:6379'

CELERY_RESULT_BACKEND = 'redis://localhost:6379'

CELERY_ACCEPT_CONTENT = ['application/json']

CELERY_TASK_SERIALIZER = 'json'

CELERY_RESULT_SERIALIZER = 'json'

CELERY_TIMEZONE = 'Asia/Shanghai'

# rabbitmq 配置

# 官网优化的地方也推荐使用c的librabbitmq

CELERY_RESULT_BACKEND = "amqp"

# celery任务执行结果的超时时间

CELERY_TASK_RESULT_EXPIRES = 1200

# celery worker的并发数

CELERYD_CONCURRENCY = 50

# celery worker 每次去rabbitmq取任务的数量

CELERYD_PREFETCH_MULTIPLIER = 4

# 每个worker执行了多少任务就会死掉

CELERYD_MAX_TASKS_PER_CHILD = 40

# 这是使用了django-celery默认的数据库调度模型,任务执行周期都被存在你指定的orm数据库中

CELERYBEAT_SCHEDULER = 'djcelery.schedulers.DatabaseScheduler'

# 我做的rabbitmq和celery监控很完善所以这个任务超时时间比较短只有半小时

CELERYD_TASK_TIME_LIMIT = 1800

# 默认的队列，如果一个消息不符合其他的队列就会放在默认队列里面

CELERY_DEFAULT_QUEUE = "default_dongwm"

## 以下是队列的一些配置

CELERY_QUEUES = {

  "default_dongwm": { # 这是上面指定的默认队列

    "exchange": "default_dongwm",

    "exchange_type": "direct",

    "routing_key": "default_dongwm"

  },

  "topicqueue": { # 这是一个topic队列 凡是topictest开头的routing key都会被放到这个队列

    "routing_key": "topictest.#",

    "exchange": "topic_exchange",

    "exchange_type": "topic",

  },

  "test2": { # test和test2是2个fanout队列,注意他们的exchange相同

    "exchange": "broadcast_tasks",

    "exchange_type": "fanout",

    "binding_key": "broadcast_tasks",

  },

  "test": {

    "exchange": "broadcast_tasks",

    "exchange_type": "fanout",

    "binding_key": "broadcast_tasks2",

  },

}

class MyRouter(object):

  def route_for_task(self, task, args=None, kwargs=None):

    if task.startswith('topictest'):

      return {

        'queue': 'topicqueue',

        }

    # 我的dongwm.tasks文件里面有2个任务都是test开头

    elif task.startswith('webui.tasks.test'):

      return {

        "exchange": "broadcast_tasks",

      }

    # 剩下的其实就会被放到默认队列

    else:

      return None

# CELERY_ROUTES本来也可以用一个大的含有多个字典的字典,但是不如直接对它做一个名称统配

CELERY_ROUTES = (MyRouter(), )

创建一个应用和异步任务

root@bogon:~# django-admin startapp webui

root@bogon:~# cat webui/tasks.py

from __future__ import absolute_import

from celery import shared_task

@shared_task

def add(x, y):

  return x + y

创建一个定时任务

#每分钟执行任务

@periodic_task(run_every=crontab(minute="*/1"))

def check_ping():

  print 'Pong'

更多详细的配置请参考官方文档。

http://docs.celeryproject.org/en/latest/index.html

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django celery异步框架

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