tornado-uvloop.py

#!/usr/bin/env
# coding: utf-8

import asyncio

import requests
import tornado.gen as gen
import tornado.httpclient as httpclient
import tornado.httpserver as httpserver
import tornado.options as options
import tornado.platform.asyncio as tornado_asyncio
import tornado.web as web
import uvloop

options.parse_command_line()


class IndexHandler(web.RequestHandler):
    def get(self):
        self.finish("It works")


class SleepHandler(web.RequestHandler):
    async def get(self):
        print("hello tornado")
        await asyncio.sleep(5)
        self.write('It works!')


class AsyncHttpHandler(web.RequestHandler):
    async def get(self):
        url = 'http://127.0.0.1:5000/'
        client = httpclient.AsyncHTTPClient()
        resp = await client.fetch(url)
        print(resp.body)
        self.finish(resp.body)


class GenHttpHandler(web.RequestHandler):
    @gen.coroutine
    def get(self):
        url = 'http://127.0.0.1:5000/'
        client = httpclient.AsyncHTTPClient()
        resp = yield client.fetch(url)
        print(resp.body)
        self.finish(resp.body)


class SyncHttpHandler(web.RequestHandler):
    async def get(self):
        url = 'http://127.0.0.1:5000/'
        resp = requests.get(url)
        print(resp.text)
        self.finish(resp.text)


class App(web.Application):
    def __init__(self):
        settings = {
            'debug': True
        }
        super(App, self).__init__(
            handlers=[
                (r'/', IndexHandler),
                (r'/async', AsyncHttpHandler),
                (r'/gen', GenHttpHandler),
                (r'/sync', SyncHttpHandler),
                (r'/sleep', SleepHandler),
            ],
            **settings)


if __name__ == '__main__':
    asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())
    tornado_asyncio.AsyncIOMainLoop().install()
    app = App()
    server = httpserver.HTTPServer(app, xheaders=True)
    server.listen(5030)
    asyncio.get_event_loop().run_forever()

This piece of code helped me a lot. Just wanted to say that in Tornado 5.0 AsyncIOMainLoop is deprecated. But the code above runs ok just commenting the line tornado_asyncio.AsyncIOMainLoop().install()

Awesome thanks!