Tornado

Real Time, so what? Tornado – The baby that comes with it 1000s simultaneously active connections

Open-source (Apache 2.0 License) Nginx Non-blocking web server Epoll (callbacks on the kernel file structure) Push vs Pull (long polling) Real-time web services

- Code Snippets URL Mapping (get + post) class MainHandler(tornado.web.RequestHandler): def get(self): self.write("You requested the main page") class StoryHandler(tornado.web.RequestHandler): def get(self, story_id): self.write("You requested the story " + story_id) application = tornado.web.Application([ (r"/", MainHandler), (r"/story/([0-9]+)", StoryHandler), ]) Post arguments class MainHandler(tornado.web.RequestHandler): def get(self): self.write('<html><body><form action="/" method="post">' '<input type="text" name="message">' '<input type="submit" value="Submit">' '</form></body></html>') def post(self): self.set_header("Content-Type", "text/plain") self.write("You wrote " + self.get_argument("message")) HTTPRequest

- Code Snippets HTML Templates <html> <head> <title>{{ title }}</title> </head> <body> <ul> {% for item in items %} <li>{{ escape(item) }}</li> {% end %} </ul> </body> </html> Template Handler class MainHandler(tornado.web.RequestHandler): def get(self): Items = ["Item 1", "Item 2", "Item 3"] self.render("template.html", title="My title", items=items)

- UI Modules Widget ,[object Object]

MySQLBlog Post 1 Widget myModule.py Blog Post 2 Widget Web Page <short python code here…>

- Asynchronous Requests 1. Fetch data www.website.com Picasa/Flickr 2. Response (callback) Synchronous Requests ,[object Object]

Tornado

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