Detailed explanation of how to register Tornado with decorator-Python Tutorial-php.cn

This article mainly introduces python to use decorators to automatically register Tornado routes. The article provides three versions of solutions. Friends in need can refer to them. Let’s take a look together.

First version

In this version, the RouterConfigobjectis first created, and itsconstructor methodis createdtornado.web.Application()And assign the value toself.Application, add the@app.routedecorator to each Handler, corresponding to the RouterConfig below route object, in which the Handler instance will be assigned to the handler parameter, and finally the corresponding relationship between the URL and the Handler is added to the routing table, and theattributeof the URL is created in each Handler.

#!/usr/bin/env python # _*_ coding:utf-8 _*_ # Created by 安生 on 2017/2/9 import tornado import tornado.web import tornado.ioloop class RouterConfig: def init(self): self.Application = tornado.web.Application() # 创建路由对象 def route(self, handler): self.Application.add_handlers('.*$', [(handler.URL, handler)]) # 路有关系映射添加到路由表中 app = RouterConfig() # 创建路由 @app.route class MainHandler(tornado.web.RequestHandler): URL = r'/' def get(self, *args, **kwargs): self.write('Hello, 安生') @app.route class MainHandler(tornado.web.RequestHandler): URL = r'/hi' def get(self, *args, **kwargs): self.write('hi, 安生') if name == "main": app.Application.listen(8000) print("http://127.0.0.1:8000/") tornado.ioloop.IOLoop.instance().start()

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The second version

Create the Route object, and then add the decorator@route(r'/')to the Handler, And pass in the URL, which corresponds to the url parameter in thecallmethod, and then add the route correspondence to the list in a primitive way. After all routes are added, the way to create Tornado is object, then put the routing table into it, and finally complete the registration.

#!/usr/bin/env python # _*_ coding:utf-8 _*_ # Created by 安生 on 2017/2/9 import tornado.ioloop import tornado.web class Route(object): """ 把每个URL与Handler的关系保存到一个元组中，然后追加到列表内，列表内包含了所有的Handler """ def init(self): self.urls = list() # 路由列表 def call(self, url, *args, **kwargs): def register(cls): self.urls.append((url, cls)) # 把路由的对应关系表添加到路由列表中 return cls return register route = Route() # 创建路由表对象 @route(r'/') class MainHandler(tornado.web.RequestHandler): def get(self, *args, **kwargs): self.write('Hello, 安生') @route(r'/hi') class MainHandler(tornado.web.RequestHandler): def get(self, *args, **kwargs): self.write('hi, 安生') application = tornado.web.Application(route.urls) # 创建app，并且把路有关系放入到Application对象中 if name == 'main': application.listen(8000) print("http://127.0.0.1:%s/" % 8000) tornado.ioloop.IOLoop.instance().start()

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The third version

This version is also the version I am using now. The principles are the same. The feature here isInheritanceTornado routing object

#!/usr/bin/env python # _*_ coding:utf-8 _*_ # Created by 安生 on 2017/2/9 import tornado.web import tornado.ioloop class RouterConfig(tornado.web.Application): """ 重置Tornado自带的路有对象 """ def route(self, url): """ :param url: URL地址 :return: 注册路由关系对应表的装饰器 """ def register(handler): """ :param handler: URL对应的Handler :return: Handler """ self.add_handlers(".*$", [(url, handler)]) # URL和Handler对应关系添加到路由表中 return handler return register app = RouterConfig(cookie_secret='ulb7bEIZmwpV545Z') # 创建Tornado路由对象，默认路由表为空 @app.route(r'/') class MainHandler(tornado.web.RequestHandler): def get(self, *args, **kwargs): self.write('Hello, 安生') @app.route(r'/hi') class MainHandler(tornado.web.RequestHandler): def get(self, *args, **kwargs): self.write('hi, 安生') if name == "main": app.listen(8000) print("http://127.0.0.1:%s/" % 8000) tornado.ioloop.IOLoop.instance().start()

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Test

In the above version, the test method and output are the same. You can use the requests module to simulate HTTP requests

>>> import requests >>> requests.get('http://127.0.0.1:8000/').text 'Hello, 安生' >>> requests.get('http://127.0.0.1:8000/hi').text 'hi, 安生'

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Summary

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