摘要：前言針對高延時任務(wù)直接在一次網(wǎng)絡(luò)請求中處理完畢會導(dǎo)致很不好的體驗則可以不阻塞請求后臺處理這些任務(wù)并且可以使用的進(jìn)行數(shù)據(jù)庫操作環(huán)境其他創(chuàng)建工程此時項目結(jié)構(gòu)如下修改添加修改創(chuàng)建新創(chuàng)

前言: 針對高延時任務(wù), 直接在一次網(wǎng)絡(luò)請求中處理完畢會導(dǎo)致很不好的體驗, celery則可以不阻塞請求后臺處理這些任務(wù), 并且可以使用django的models進(jìn)行數(shù)據(jù)庫操作.

python models:

celery-4.1.1

redis-2.10.6

django-1.11.7

其他:

redis-3.2.9

macos

python3.6

django-admin startproject dc
cd dc
django-admin startapp main

此時項目結(jié)構(gòu)如下

dc
|-- __init__.py
|-- main
|   |-- __init__.py
|   |-- admin.py
|   |-- apps.py
|   |-- migrations
|   |   `-- __init__.py
|   |-- models.py
|   |-- tests.py
|   `-- views.py
|-- settings.py
|-- urls.py
`-- wsgi.py

修改settings.py, 添加app

INSTALLED_APPS = [
    "django.contrib.admin",
    "django.contrib.auth",
    "django.contrib.contenttypes",
    "django.contrib.sessions",
    "django.contrib.messages",
    "django.contrib.staticfiles",
    "dc.main" //new added
]

修改dc/main/models.py, 創(chuàng)建新models

from django.db import models

# Create your models here.

class Person(models.Model):
    first_name = models.CharField(max_length=30)
    last_name = models.CharField(max_length=30)

創(chuàng)建根訪問節(jié)點

dc/main/views.py

from django.shortcuts import render
from django.http import HttpResponse
# Create your views here.


def hello(request):
    return HttpResponse("hello world")

dc/urls.py

urlpatterns = [
    url(r"^admin/", admin.site.urls),
    url(r"^$", hello) //new added
]

依次執(zhí)行以下語句, 初始化django各功能模塊

python manage.py migrate
python manage.py makemigrations main
python manage.py sqlmigrate main 0001
python manage.py migrate

接下來python manage.py runserver, 訪問http://127.0.0.1:8000 即可看到hello world.

redis是作為celery中間件使用的, 用來存儲消息隊列.

redis解壓后, 直接運行src/redis-server即可啟動, 默認(rèn)端口6379

參考文檔

創(chuàng)建dc/celery.py

#-*- coding:utf-8 -*-

import os
from celery import Celery

# set the default Django settings module for the "celery" program.
os.environ.setdefault("DJANGO_SETTINGS_MODULE", "dc.settings")

app = Celery("dc")

# 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()

修改 dc/__init__.py

from .celery import app as celery_app

__all__ = ["celery_app"]

修改 dc/settings.py, 設(shè)定 redis URL

CELERY_BROKER_URL = "redis://127.0.0.1:6379/3"

創(chuàng)建dc/main/tasks.py

#-*- coding:utf-8 -*-

from celery import shared_task

@shared_task
def test():
    import time
    time.sleep(5)
    from dc.main.models import Person
    person = Person(first_name="smith", last_name="jhon")
    person.save()
    c = Person.objects.count()
    print(f"person count is {c}")

修改dc/main/views.py

def hello(request):
    from dc.main.tasks import test
    test.delay()
    return HttpResponse("hello world")

啟動celery進(jìn)程

celery -A dc worker -l info

接下來訪問http://127.0.0.1:8000, 即可發(fā)現(xiàn)頁面立刻返回, 并沒有被time阻塞, 查看啟動celery的窗口, 即可發(fā)現(xiàn)log以及打印的信息, 確定models可以正常使用.

おわり.