Real-time WebservingReal-time WebservingPlaying around with Tornado Web ServerPlaying around with Tornado Web Server

Lean Lean BasicsBasicsWhile Tornado is similar to While Tornado is similar to existing Web-frameworks in existing Web-frameworks in Python (Django, Google's Python (Django, Google's webapp, webapp, web.pyweb.py), it focuses ), it focuses on speed and handling large on speed and handling large amounts of simultaneous amounts of simultaneous traffic.traffic.

RSS reader RSS reader flagged/read/favourite/selectedflagged/read/favourite/selected

Show Show currentcurrent status/price for a number status/price for a number of productsof products

Ask the server to process an imageAsk the server to process an image

Routing chat between webappsRouting chat between webapps

Web User ScenariosWeb User Scenarios

Server StartupServer StartupMulti sub-domain, auto-reloading processMulti sub-domain, auto-reloading process

ioloop = tornado.ioloop.IOLoop.instance() for n in ioloop = tornado.ioloop.IOLoop.instance() for n in structure.SITES: site = structure.SITES[n] if structure.SITES: site = structure.SITES[n] if site["package"] in ("tornado", "mediaserver"): server = site["package"] in ("tornado", "mediaserver"): server = HTTPServer(HTTPServer(ApplicationApplication(urls,site,ioloop=ioloop)) (urls,site,ioloop=ioloop)) server.listen(site["port"]) server.listen(site["port"]) tornado.autoreload.start(io_loop=ioloop) ioloop.start()tornado.autoreload.start(io_loop=ioloop) ioloop.start()

Handle RequestHandle Request

urls = [urls = [ (r"/static/(.*)", StaticFileHandler),](r"/static/(.*)", StaticFileHandler),]

class MyHandler(tornado.class MyHandler(tornado.web.RequestHandler): def ): def get(self,subpath):get(self,subpath): info = {info = { “ “abc_list”: [“a”, ”b”, ”c”],abc_list”: [“a”, ”b”, ”c”], “ “path”: self.request.path,path”: self.request.path, “ “subpath”: subpathsubpath”: subpath } self.render("home.html",**info) def } self.render("home.html",**info) def post(self,subpath): post_names = post(self,subpath): post_names = self.request.arguments.keys()self.request.arguments.keys() headers_dict = self.request.headersheaders_dict = self.request.headers

Serve ResponseServe Response

class MyHandler(tornado.class MyHandler(tornado.web.RequestHandler): def ): def get(self,subpath):get(self,subpath): site_title = self.application.site["title"] info = {site_title = self.application.site["title"] info = { “ “abc_list”: [“a”, ”b”, ”c”],abc_list”: [“a”, ”b”, ”c”], “ “site_title”: site_titlesite_title”: site_title } self.render("home.html",**info)} self.render("home.html",**info) def post(self): post_names = def post(self): post_names = self.request.arguments.keys(): self.set_header("Content-self.request.arguments.keys(): self.set_header("Content-Type","text/plain") self.write('done.')Type","text/plain") self.write('done.')

Delayed ResponseDelayed Response

class MainHandler(tornado.class MainHandler(tornado.web.RequestHandler): ): @@tornado.tornado.web.asynchronousweb.asynchronous def get(self): http = tornado.httpclient.AsyncHTTPClient() http.fetch("http://friendfeed-api.com/v2/feed/http://friendfeed-api.com/v2/feed/bret", callback=self.async_callback(self.on_responseself.on_response)) )) def on_response(self, response): if response.error: raise def on_response(self, response): if response.error: raise tornado.tornado.web.HTTPErrorweb.HTTPError(500) json = (500) json = tornado.escape.json_decode(response.bodtornado.escape.json_decode(response.body) self.write("Fetched " + str(len(json["entries"])) + " entries " "from the FriendFeed API") self.finishself.finish()()

Baseline PerformanceBaseline PerformanceUsing Apache BenchUsing Apache Bench

Henrik VendelboHenrik Vendelbohvendelbo@googlemail.comhvendelbo@googlemail.com

http://github.com/thepianhttp://github.com/thepian

Baseline PerformanceBaseline PerformanceUsing Apache BenchUsing Apache Bench