Django commands自定制

什么是Django Commands

Django 对于命令的添加有一套规范，你可以为每个app 指定命令。通俗一点讲，比如在使用manage.py文件执行命令的时候，可以自定制自己的命令，来实现命令的扩充。

commands的创建

1、在app内创建一个management的python目录

2、在management目录里面创建commands的python文件夹

3、在commands文件夹下创建任意py文件

此时py文件名就是你的自定制命令，可以使用下面方式执行

python manage.py 命令名

撰写command文件要求 

首先对于文件名没什么要求，内部需要定义一个Command类并继承BaseCommand类或其子类。

文件结构

其中help是command功能作用简介，handle函数是主处理程序，add_arguments函数是用来接收可选参数的

简单测试

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

# __author__ = 'dandy'

from django.core.management.base import BaseCommand

class Command(BaseCommand):

    help = 'test'

    def handle(self, *args, **options):

        print('test')

带参数的测试

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

# __author__ = 'dandy'

from django.core.management.base import BaseCommand

class Command(BaseCommand):

    def add_arguments(self, parser):

        parser.add_argument('aaa', nargs='+', type=int)

        parser.add_argument('--delete',

                            action='store_true',

                            dest='delete',

                            default=False,

                            help='Delete poll instead of closing it')

    def handle(self, *args, **options):

        print('test')

        print(args, options)

options里面直接取参数就可以了。

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

 # __author__ = 'dandy'

 from django.core.management.base import BaseCommand

 from django.conf import settings

 import requests

 import os

 import threading

 command_path = os.path.join(settings.BASE_DIR, 'api', 'management', 'commands')

 file = os.path.join(command_path, 'api_urls')

 class Command(BaseCommand):

     help = 'test cost time for each api when getting data .We have set a middleware and create a file for log.' \

            'here just send request by thread pool'

     def handle(self, *args, **options):

         url_list = []

         try:

             if not os.path.exists(file):

                 raise FileNotFoundError('ERROR！！！！ no file named api_urls in %s' % file)

             with open (file, 'rb') as obj:

                 urls = obj.readlines()

                 if not len(urls):

                     raise Exception('ERROR！！！ api_urls is a empty file !!')

                 for url in urls:

                     url = url.strip()

                     if url:

                         t = threading.Thread(target=self.get_url, args=(url,))

                         # t.setDaemon(True)  # set True and you don't need to wait until main thread finished

                         t.start()

             print('send all request successfully !')

         except Exception as e:

             print(e)

     def get_url(self, url):

         requests.get(url)

实战1

 http://www.baidu.com

 http://www.qq.com

api_urls