Created
August 11, 2011 19:17
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| import time | |
| import functools | |
| import tornado.httpserver | |
| import tornado.ioloop | |
| import tornado.web | |
| import tornado.wsgi | |
| import tornado.httpclient | |
| class Urls(object): | |
| def __init__(self, urls): | |
| self.urls = dict([(i, url) for i, url in enumerate(urls)]) | |
| self.responses = {} | |
| self.callbacks = [] | |
| def _callback(self, id, response): | |
| self.callbacks.remove(id) | |
| self.responses[id] = response | |
| def fetch(self): | |
| http = tornado.httpclient.AsyncHTTPClient() | |
| for id, url in self.urls.items(): | |
| self.callbacks.append(id) | |
| http.fetch(url, callback=functools.partial(self._callback, id)) | |
| class Waiter(object): | |
| def __init__(self, callback, io_loop=None): | |
| self.io_loop = io_loop or tornado.ioloop.IOLoop.instance() | |
| self.callback = callback | |
| def wait(self, obj): | |
| """ | |
| Waits for the current set of callbacks to complete before moving on. | |
| """ | |
| if obj.callbacks: | |
| self.io_loop.add_timeout(time.time() + 0.3, functools.partial(self.wait, obj)) | |
| else: | |
| try: | |
| self.callback(obj) | |
| except Exception, e: | |
| self.finish() | |
| def start(self, obj): | |
| obj.fetch() | |
| self.wait(obj) | |
| class MainHandler(tornado.web.RequestHandler): | |
| @tornado.web.asynchronous | |
| def get(self): | |
| obj = Urls(['http://google.com', 'http://apple.com', 'http://yahoo.com', 'http://microsoft.com']) | |
| waiter = Waiter(self._print_servers) | |
| waiter.start(obj) | |
| def _print_servers(self, obj): | |
| self.write('<html><body>') | |
| for response in obj.responses.values(): | |
| self.write('%s <br/>' % response.headers.get('Server')) | |
| self.write('</body></html>') | |
| self.finish() | |
| url_mapping = [ | |
| ('/', MainHandler) | |
| ] | |
| app_settings = { | |
| "debug": True, | |
| } | |
| if __name__ == "__main__": | |
| application = tornado.web.Application(url_mapping, **app_settings) | |
| http_server = tornado.httpserver.HTTPServer(application, xheaders=True) | |
| http_server.listen(8000) | |
| tornado.ioloop.IOLoop.instance().start() |
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