vishnevskiy / greentornado

Tornado Hub for Eventlet

Allows Eventlet to run on top of Tornado's IOLoop.

If you want to use Eventlet without using greentornado.greenify you have to call eventlet.hubs.use_hub(greentornado.Hub) manually.

Web Crawler

from eventlet.green import urllib2
from tornado import ioloop
import eventlet
import greentornado

@greentornado.greenify
def scrape():
    urls = ["http://www.google.com/intl/en_ALL/images/logo.gif",
         "https://wiki.secondlife.com/w/images/secondlife.jpg",
         "http://us.i1.yimg.com/us.yimg.com/i/ww/beta/y3.gif"]

    def fetch(url):
        print 'Fetching'
        return urllib2.urlopen(url).read()

    pool = eventlet.GreenPool()

    for body in pool.imap(fetch, urls):
        print 'Got Body', len(body)

    ioloop.IOLoop().instance().stop()

if __name__ == '__main__':
    scrape()
    ioloop.IOLoop().instance().start()

HTTP Proxy

from eventlet.green import urllib2
from tornado import httpserver, ioloop
import greentornado

@greentornado.greenify
def handle_request(request):
    body = urllib2.urlopen('http://blog.eventlet.net/feed/').read()
    request.write('HTTP/1.1 200 OK\r\nContent-Length: %d\r\n\r\n%s' % (len(body), body))
    request.finish()

if __name__ == '__main__':
    httpserver.HTTPServer(handle_request).listen(8888)
    ioloop.IOLoop.instance().start()

web.py

import tornado.httpserver
import tornado.ioloop
import tornado.web
import greentornado

@greentornado.greenify
class MainHandler(tornado.web.RequestHandler):
    def get(self):
        self.write("Hello, world")

application = tornado.web.Application([
    (r'/', MainHandler),
])

if __name__ == '__main__':
    http_server = tornado.httpserver.HTTPServer(application)
    http_server.listen(8888)
    tornado.ioloop.IOLoop.instance().start()