import tornado.httpserver
import tornado.httpclient
import tornado.ioloop
import tornado.options
import tornado.web
import logging

import time
from functools import partial

class MainHandler(tornado.web.RequestHandler):
    @tornado.web.asynchronous
    def get(self, url, retry = 0):
        http = tornado.httpclient.AsyncHTTPClient()
        request = tornado.httpclient.HTTPRequest(url=url,
            connect_timeout=1.0, request_timeout=1.0)
        http.fetch(request, callback=self.async_callback(
            partial(self.on_response, retry=2, url = url) ) )          		      
 
    def on_response(self, response, retry= 0, url= None):
        if response.error:
            #import pdb; pdb.set_trace()
            if isinstance(response.error, tornado.httpclient.HTTPError):
                raise  tornado.web.HTTPError(status_code = response.error.code)
            if (retry > 0) and (url is not None) :
                self.get(url, retry - 1)
            else:
                raise tornado.web.HTTPError(500)
        else:
            self.write(response.body)
            self.finish()

def main():
    tornado.options.parse_command_line()
    application = tornado.web.Application([
        (r"/(.*)", MainHandler),
    ])
    http_server = tornado.httpserver.HTTPServer(application)
    http_server.listen(8888)
    tornado.ioloop.IOLoop.instance().start()

if __name__ == "__main__":
    main()