How can I use Tornado and Redis asynchronously?

Question

I\'m trying to find how can I use Redis and Tornado asynchronously. I found the tornado-redis but I need more than just add a yield in the code.

I have the

Answer 1

For Python >= 3.3, I would advise you to use aioredis. I did not test the code below but it should be something like that:

import redis
import tornado.web
from tornado.web import RequestHandler

import aioredis
import asyncio
from aioredis.pubsub import Receiver


class WaiterHandler(tornado.web.RequestHandler):

    @tornado.web.asynchronous
    def get(self):
        client = await aioredis.create_redis((host, 6279), encoding="utf-8", loop=IOLoop.instance().asyncio_loop)

        ch = redis.channels['test_channel']
        result = None
        while await ch.wait_message():
            item = await ch.get()
            if item['type'] == 'message':
                print item['channel']
                print item['data']
                result = item['data']

        self.write(result)
        self.finish()


class GetHandler(tornado.web.RequestHandler):

    def get(self):
        self.write("Hello world")


application = tornado.web.Application([
    (r"/", GetHandler),
    (r"/wait", WaiterHandler),
])

if __name__ == '__main__':
    print 'running'
    tornado.ioloop.IOLoop.configure('tornado.platform.asyncio.AsyncIOLoop')
    server = tornado.httpserver.HTTPServer(application)
    server.bind(8888)
    # zero means creating as many processes as there are cores.
    server.start(0)
    tornado.ioloop.IOLoop.instance().start()