tornado

48.深入理解Tornado——一个异步web服务器

由 不羁的心 提交于 2019-12-21 10:52:40
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 原文地址： http://golubenco.org/?p=16 这篇文章的目的在于对Tornado这个异步服务器软件的底层进行一番探索。我采用自底向上的方式进行介绍，从轮训开始，向上一直到应用层，指出我认为有趣的部分。 所以，如果你有打算要阅读Tornado这个web框架的源码，又或者是你对一个异步web服务器是如何工作的感兴趣，我可以在这成为你的指导。 通过阅读这篇文章，你将可以： 自己写一个 Comet 架构程序的服务器端部分，即使你是从拷贝别人的代码开始。 如果你想在Tornado框架上做开发，通过这篇文章你将更好的理解Tornado web框架。 在 Tornado和Twisted的争论 上，你将更有见解。 介绍 假设你还不知道Tornado是什么也不知道为什么应该对它感兴趣，那我将用简短的话来介绍Tornado这个项目。如果你已经对它有了兴趣，你可以跳去看下一节内容。 Tornado 是一个用Python编写的异步HTTP服务器，同时也是一个web开发框架。该框架服务于 FriendFeed 网站，最近Facebook也在使用它。FriendFeed网站有 用户数多 和应用实时性强的特点，所以性能和可扩展性是很受重视的。由于现在它是开源的了（这得归功于Facebook）

tornado 源码分析 waker

由 回眸只為那壹抹淺笑 提交于 2019-12-21 10:40:07
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> class Waker(interface.Waker): """Create an OS independent asynchronous pipe. For use on platforms that don't have os.pipe() (or where pipes cannot be passed to select()), but do have sockets. This includes Windows and Jython. """ def __init__(self): #让os自动分配一个socket # Based on Zope select_trigger.py: self.writer = socket.socket() # Disable buffering -- pulling the trigger sends 1 byte, # and we want that sent immediately, to wake up ASAP. self.writer.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1) count = 0 while 1: count += 1 a = socket.socket() a

深入理解 tornado 之底层 ioloop 实现

由 ∥☆過路亽．° 提交于 2019-12-21 10:39:41
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 最近打算学习 tornado 的源码，所以就建立一个系列主题 “深入理解 tornado” 。 在此记录学习经历及个人见解与大家分享。文中一定会出现理解不到位或理解错误的地方，还请大家多多指教 进入正题： tornado 优秀的大并发处理能力得益于它的 web server 从底层开始就自己实现了一整套基于 epoll 的单线程异步架构（其他 python web 框架的自带 server 基本是基于 wsgi 写的简单服务器，并没有自己实现底层结构。 关于 wsgi 详见之前的文章： 自己写一个 wsgi 服务器运行 Django 、Tornado 应用 ）。 那么 tornado.ioloop 就是 tornado web server 最底层的实现。 看 ioloop 之前，我们需要了解一些预备知识，有助于我们理解 ioloop。 epoll ioloop 的实现基于 epoll ，那么什么是 epoll？ epoll 是Linux内核为处理大批量文件描述符而作了改进的 poll 。 那么什么又是 poll ？ 首先，我们回顾一下， socket 通信时的服务端，当它接受（ accept ）一个连接并建立通信后（ connection ）就进行通信，而此时我们并不知道连接的客户端有没有信息发完。

windows下tornado报错 in add_reader raise NotImplementedError的解决

由 ∥☆過路亽．° 提交于 2019-12-21 10:27:40
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 之前的代码拿过来跑,遇到报错如下: Traceback (most recent call last): File ".\index.py", line 325, in <module> app.listen(8888) File "C:\Program Files\Python38\lib\site-packages\tornado\web.py", line 2112, in listen server.listen(port, address) File "C:\Program Files\Python38\lib\site-packages\tornado\tcpserver.py", line 152, in listen self.add_sockets(sockets) File "C:\Program Files\Python38\lib\site-packages\tornado\tcpserver.py", line 165, in add_sockets self._handlers[sock.fileno()] = add_accept_handler( File "C:\Program Files\Python38\lib\site-packages\tornado\netutil

Tornado websocket handler , self.close() is closing connection without triggering the on_close() method

由 坚强是说给别人听的谎言 提交于 2019-12-21 05:32:06
问题 im new at (python, stackoverflow, tornado) , so please, be patient :). Correct me. Im working with tornado on a real-time app. When i call self.close() inside the Websocket handler class , the on_close method is not fired up , for this time i did a little wrapper , fixing the problem and (for example) discarding that connected agent (pure avascript wss api client) correctly. All network problems are discarded , since my poor wrapper is working nicely and im in a LAN enviroment. is someone

How to store real-time chat messages in database?

由 瘦欲@ 提交于 2019-12-21 04:49:23
问题 I am using mysqldb for my database currently, and I need to integrate a messaging feature that is in real-time. The chat demo that Tornado provides does not implement a database, (whereas the blog does .) This messaging service also will also double as an email in the future (like how Facebook's message service works. The chat platform is also email.) Regardless, I would like to make sure that my current, first chat version will be able to be expanded to function as email, and overall, I need

How to pass arguments from tornado to a js file but not html?

由 删除回忆录丶 提交于 2019-12-21 04:40:56
问题 In the server I render a template with an argument, like this: self.render('templates/test.html', names="['Jane', 'Tom']") And I successfully got it in the <script> of test.html by this: var N = "{{ names }}"; Now I want to seperate the js code and html : <script type="text/javascript" src="static/test.js"></script> but it failed when I put the N = "{{ names }}" in that js file. Can anyone tell me what to do with that ? Thanks ! 回答1: You can create setter function to be called from HTML file

Tornado-数据库（torndb包）

由 余生长醉 提交于 2019-12-21 04:00:02
1、torndb数据库简介 在Tornado3.0版本以前提供tornado.database模块用来操作MySQL数据库，而从3.0版本开始，此模块就被独立出来，作为torndb包单独提供。torndb只是对MySQLdb的简单封装，不支持Python 3。 2、torndb安装 pip install torndb 3、连接初始化 class Applicatin(tornado.web.application): def __init__(self): handler = [ (r"index/",IndexHandler), ] settings = dic( template_path = os.path.join(os.path.dirname(__file__),"templates"), static_path = os.path.join(os.path.dirname(__file__),"static") ) super(Application,self).__init__(handler,**settings) self.db = torndb.Connection( host = "127,0,0,1", database = "ihome", user = "root", pwd = "mysql" ) 4、使用数据库 1、执行语句 1、execute

Having problems running a long blocking function in a thread in Tornado

由 我的未来我决定 提交于 2019-12-21 02:47:37
问题 I am very new to Tornado. Was just seeing how to handle a request which blocks in Tornado. I run the blocking code in a separate thread. However the main thread still blocks till the threaded function finishes. I am not using gen.coroutine here, but have tried that and the result is the same counter = 0 def run_async(func): @wraps(func) def function_in_a_thread(*args, **kwargs): func_t = Thread(target=func, args=args, kwargs=kwargs) func_t.start() return function_in_a_thread def long_blocking

Tornado server throws error Stream is closed

由 那年仲夏 提交于 2019-12-21 02:45:15
问题 I'm trying to implement a very basic chat/echo web page. When the client visits /notify:8000 a simple site loads, on the client side a request is initiated to establish a listener, on the back-end the cloud count is updated and sent to all existing clients. Whenever the user enters something in a text box, a POST is made to the back-end and all the other clients receive an update with that text. Here's the front-end template <html> <head> <script type="text/javascript" src="http://code.jquery
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