这篇文章给大家介绍Celery怎么在Django中使用,内容非常详细,感兴趣的小伙伴们可以参考借鉴,希望对大家能有所帮助。
(一)、概述
Celery是一个简单、灵活和可靠的基于多任务的分布式系统,为运营提供用于维护此系统的工具。专注于实时处理的任务队列,同时也支持任务的调度。执行单元为任务(task),利用多线程这些任务可以被并发的在单个或多个职程(worker)上运行。
Celery通过消息机制通信,通常通过中间人(broker)来分配和调节客户端与职程服务器(worker)之间的通信。客户端发送一条消息,中间人把消息分配给一个职程,最后由职程来负责执行此任务。
Celery可以有多个职程和中间人,这样提高了高可用性和横向的扩展能力
Celery由python语言开发,但是该协议可以用任何语言拉力实现,例如:Django中的Celery、node中的node-celery和php中的celery-php
(二)、Django中使用Celery的流程与配置
导入Celery:pip3 install Celery
在 与项目同名的目录下 创建celery.py文件,特别注意:项目同名的目录下
复制内容到该文件
修改两处内容
import os from celery import Celery # set the default Django settings module for the 'celery' program. os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'proj.settings') app = Celery('pro') # Using a string here means the worker doesn't have to serialize # the configuration object to child processes. # - namespace='CELERY' means all celery-related configuration keys # should have a `CELERY_` prefix. app.config_from_object('django.conf:settings', namespace='CELERY') # Load task modules from all registered Django app configs. app.autodiscover_tasks() @app.task(bind=True) def debug_task(self): print(f'Request: {self.request!r}')
在 与项目同名的目录下 的__init__.py文件中添加内容
# 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',)
在settings.py文件中添加配置
# Celery配置 CELERY_BROKER_URL = env("CELERY_BROKER_URL") CELERY_RESULT_BACKEND = env("CELERY_RESULT_BACKEND") CELERY_ACCEPT_CONTENT = ["json", "msgpack"] CELERY_TASK_SERIALIZER = "json" CELERY_TIMEZONE = "Asia/Shanghai" CELERY_TASK_TRACK_STARTED = True CELERY_TASK_TIME_LIMIT = 30 * 60
在app下创建tasks.py文件,创建发送消息功能,任务方法必须添加装饰器:@shared_task
from rest_framework.response import Response from rest_framework.generics import GenericAPIView from time import sleep from celery import shared_task class TestView3(GenericAPIView): @classmethod @shared_task def sleep(self, duration): sleep(duration) return Response("成功", status=200)
创建视图和路由
### views.py from .tasks import TestView3 class TestView1(GenericAPIView): def get(self, request): TestView3.sleep(10) return Response("celery实验成功") test_view_1 = TestView1.as_view() ### urls.py from django.urls import path from .views import ( test_view_1 ) urlpatterns = [ path('celery/', test_view_1, name="test1") ]
安装redis并启动
启动django项目
使用Celery命令启动Celery服务,命令:celery -A 项目名 worker -l info,如果如下所示则为启动成功.
celery@AppledeMacBook-Air.local v5.0.3 (singularity) Darwin-20.1.0-x86_64-i386-64bit 2020-12-05 20:52:17 [config] .> app: drf_email_project:0x7f84a0c4ad68 .> transport: redis://127.0.0.1:6379/1%20 .> results: redis://127.0.0.1:6379/2 .> concurrency: 4 (prefork) .> task events: OFF (enable -E to monitor tasks in this worker) [queues] .> celery exchange=celery(direct) key=celery [tasks] . drf_email_project.celery.debug_task . users.tasks.sleep [2020-12-05 20:52:18,166: INFO/MainProcess] Connected to redis://127.0.0.1:6379/1%20 [2020-12-05 20:52:18,179: INFO/MainProcess] mingle: searching for neighbors [2020-12-05 20:52:19,212: INFO/MainProcess] mingle: all alone [2020-12-05 20:52:19,248: WARNING/MainProcess] /Users/apple/drf-email/lib/python3.7/site-packages/celery/fixups/django.py:204: UserWarning: Using settings.DEBUG leads to a memory leak, never use this setting in production environments! leak, never use this setting in production environments!''') [2020-12-05 20:52:19,249: INFO/MainProces
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