tornado

web框架--tornado框架之模板引擎继承

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使用模板的继承可以重复使用相同结构的模板, 可以大大减少代码量入门实例一、demo目录结构注解： master.html为模板内容，被index.html，account.html引用二、各文件代码 2.1、master.html 1 <!DOCTYPE html> 2 <html lang="en"> 3 <head> 4 <meta charset="UTF-8"> 5 <title>Master</title> 6 <style> 7 *{ 8 margin: 0; 9 padding: 0; 10 } 11 .page-header{ 12 height: 48px; 13 background-color: aqua; 14 } 15 .page-content{ 16 height: 300px; 17 background-color: bisque; 18 } 19 .page-footer{ 20 height: 30px; 21 background-color: aqua; 22 } 23 </style> 24 25 </head> 26 <body> 27 <div class="page-header"></div> 28 <div class="page-content"> 29  30 {% block

web框架--tornado框架之初识

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一、初识tornado 　　对于Web框架来说，一般分为两类，其中一类则是包含上述 4部分内容的框架，另外一类就是只包含第3部分功能的框架。tornado就是一中属于前者的框架。tornado 是一个基于 Python 开发的web框架，较其他 Web 框架的区别是：采用了非阻塞的方式和对epoll的应用。这意味着对于实时 Web 服务来说，Tornado 是一个理想的 Web 框架。经典的hello world 案例：tornado内部已经帮我们实现socket。 1 #!/usr/bin/env python 2 # -*- coding: utf-8 -*- 3 import tornado.ioloop 4 import tornado.web 5 6 class MainHandler(tornado.web.RequestHandler): 7 def get(self): 8 self.write("Hello, world") 9 10 application = tornado.web.Application([ 11 (r"/index", MainHandler), 12 ]) 13 14 if __name__ == "__main__": 15 application.listen(8888) 16 tornado.ioloop.IOLoop

Exception handling for parallel fetch requests

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问题 I have the following code: try: responses = yield [httpClient.fetch(url) for url in urls] except (HTTPError, IOError, ValueError) as e: print("caught") I can't guarantee the urls given are valid. I want to be able to use the exception to validate the urls. How can I tell which url(s) fail within the caught exception? Also if one fetch fails (say the first) it looks like it breaks for the rest of the fetches? Is there a way to prevent this? Or is there a better way to check the URL can be

阅读更多关于 Tornado

前言 Tornado是使用Python编写的一个强大的、可扩展的Web服务器。它在处理严峻的网络流量时表现得足够强健，但却在创建和编写时有着足够的轻量级，并能够被用在大量的应用和工具中。 Tornado是基于Bret Taylor和其他人员为FriendFeed所开发的网络服务框架，当FriendFeed被Facebook收购后得以开源。不同于那些最多只能达到10,000个并发连接的传统网络服务器，Tornado在设计之初就考虑到了性能因素，旨在解决C10K问题，这样的设计使得其成为一个拥有非常高性能的框架。此外，它还拥有处理安全性、用户验证、社交网络以及与外部服务（如数据库和网站API）进行异步交互的工具。 Tornado 所做的是能够快速简单地编写高速的Web应用。如果编写一个可扩展的社交应用、实时分析引擎，或RESTful API，那么简单而强大的Python，以及Tornado正是为你准备的！总之，Tornado也很强大！！！下载和安装 # pip安装 pip3 install tornado # 源码安装 tar xvzf tornado-4.4.1.tar.gz cd tornado-4.4.1 python setup.py build sudo python setup.py install 源码下载： tornado-1.2.1.tar.gz 、

Using Tornado and Twisted at the same time

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I am in a weird situation where I have to use Twisted in a system built completely out of Tornado. They can share the same IOLoop so I know they can work together. My question is can I safely use their co-routine decorators in the same function? For example: import tornado.platform.twisted tornado.platform.twisted.install() ... @gen.engine @defer.inlineCallbacks def get(self): ... a = yield gen.Task(getA) # tornado b = yield proxy.callRemote(getB) # twisted ... defer.returnValue(a + b) # twisted They do work on the same IOLoop so I am thinking this should be fine. Would there be any unforeseen

tornado.web.authenticated back button issue

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I just added a simple login using tornado.web.authenticated based off of some tutorials online. Unfortunately, after logging out successfully, when I press the back button on my browser, I'm still able to see logged in pages. Is there a way to trigger the login screen for pages in the browsing history? Edit: To clarify, I am already using the @tornado.web.authenticated annotation and it is working well for the normal use cases, but I am running into the issue that when going back using the browser's Back button, I am still able to see pages as if I were logged in. I am hoping that there is a

How to improve the performance of the combination of gevent and tornado?

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问题 I am trying to use gevent as wsgi server, and use tornado WSGIApplication to process requests. Here's the code #!/usr/bin/env python # coding=utf-8 import gevent from gevent import monkey monkey.patch_all(thread=False) from gevent.pywsgi import WSGIServer from tornado.wsgi import WSGIApplication import tornado.web import tornado.wsgi import requests class MainHandler(tornado.web.RequestHandler): def get(self): requests.get('http://google.com') self.write('hello') handlers = [ (r'/',

Running a Pyramid WSGI application under tornado

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问题 Pyramid uses it's own Waitress web server for development purposes, but I want to serve my WSGI app under Tornado. I think I should configure it using the pserve .ini files, but I can't get it to work 回答1: The Pyramid application can be loaded from the INI files easily. From there you just pass the wsgi app into Tornado's WSGIContainer. from pyramid.paster import get_app app = get_app('development.ini') container = tornado.wsgi.WSGIContainer(app) 回答2: Again, not really recommending running

Python tornado with multi-process

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问题 I found how to execute tornado with multi-process. server = HTTPServer(app) server.bind(8888) server.start(0) #Forks multiple sub-processes IOLoop.current().start() In this situation is there any way to share resource over processes? and It seems using the same port over processes. Does tornado balance the load itself for each process? If so, how does it do? 回答1: In general, when using multi-process mode the processes only communicate via external services: databases, cache servers, message

Running Tornado in apache

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My end goal is to implement a WebSocket server using python. I'm accomplishing this by importing tornado in my python scripts. I've also installed mod_wsgi in apache, and their script outputs Hello World!, so WSGI seems to be working fine. Tornado is also working fine as far as I can tell. The issue comes when I use tornado's wsgi "Hello, world" script : import tornado.web import tornado.wsgi import wsgiref.simple_server class MainHandler(tornado.web.RequestHandler): def get(self): self.write("Hello, world") if __name__ == "__main__": application = tornado.wsgi.WSGIApplication([ (r"/",