Django Celery Redis 异步执行任务demo实例

一、windows中安装redis

 安装过程见 《在windows x64上部署使用Redis》

二、环境准备

requirements.txt

Django==1.10.5
celery==3.1.23
redis==2.10.5

 注意，celery 4.x 以上不支持windows

pip install -r requirements.txt

三、创建Django项目celery_proj,创建APP:celery_demo

>>django-admin startproject celery_proj
>>cd celery_proj
>>django-admin startapp celery_demo

四、添加celery相关配置信息

1.在celery_proj/celery_proj目录下，添加如下 celery.py 文件

#!/usr/bin/env python 
# -*- coding: utf-8 -*-

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

# set the default Django settings module for the 'celery_proj' program.
os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'celery_proj.settings')
app = Celery('celery_proj')

# 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))

2.在celery_proj/celery_proj/__init__.py 中添加：

from .celery import app as celery_app

3.在项目配置文件中，如celery_proj/celery_proj/settings.py 中添加：

# CELERY STUFF
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 = 'Africa/Nairobi'

五、创建异步运行任务tasks

1.在APP目录下，如celery_proj/celery_demo目录下添加如下 tasks.py

#!/usr/bin/env python 
# -*- coding: utf-8 -*-

import time
from celery import task


@task()
def add(x, y):
    return x + y


@task
def run_test_suit(ts_id):
    print "++++++++++++++++++++++++++++++++++++"
    print('jobs[ts_id=%s] running....' % ts_id)
    time.sleep(10.0)
    print('jobs[ts_id=%s] done' % ts_id)
    result = True
    return result

2.在views视图中，添加相关视图，如celery_proj/celery_demo/views.py:

from django.http import HttpResponse
from .tasks import run_test_suit


def tasks(request):
    print('before run_test_suit')
    result = run_test_suit.delay('110')
    print('after run_test_suit')
    return HttpResponse("job is runing background~")

3.添加url映射，如修改 celery_proj/celery_proj/urls.py：

from django.conf.urls import url
from celery_demo import views

urlpatterns = [
    url(r'^', views.tasks, name='task'),
]

4.启动django server

>>python manage.py runserver

5.启动celery worker

>>celery -A celery_proj worker -l info

当显示如下，证明worker已启动成功：

E:workspacecelery_proj>celery -A celery_proj worker -l info

 -------------- celery@WINDOWS-QKKYZQB v3.1.23 (Cipater)
---- **** -----
--- * ***  * -- Windows-7-6.1.7601-SP1
-- * - **** ---
- ** ---------- [config]
- ** ---------- .> app:         celery_proj:0x33fc190
- ** ---------- .> transport:   redis://localhost:6379//
- ** ---------- .> results:     redis://localhost:6379/
- *** --- * --- .> concurrency: 4 (prefork)
-- ******* ----
--- ***** ----- [queues]
 -------------- .> celery           exchange=celery(direct) key=celery


[tasks]
  . celery_demo.tasks.add
  . celery_demo.tasks.run_test_suit
  . celery_proj.celery.debug_task

[2017-03-16 18:32:47,885: INFO/MainProcess] Connected to redis://localhost:6379//

注意：每当tasks.py 修改时，都要重新启动worker

6.访问浏览器：http://localhost:8000/

django控制台马上输出相关打印语句并且返回 HttpResponse 响应

但是实际上 run_test_suit 任务未完成，任务在后台运行 模拟sleep 10s后才完成，运行结果可通过celery worker 控制台输出中显示。

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