tornado-异步非阻塞
http://www.dongwm.com/archives/shi-yong-tornadorang-ni-de-qing-qiu-yi-bu-fei-zu-sai/
tornado.gen.coroutine-协程
https://my.oschina.net/u/569730/blog/382661
http://www.dongwm.com/archives/shi-yong-tornadorang-ni-de-qing-qiu-yi-bu-fei-zu-sai/
tornado.gen.coroutine-协程
https://my.oschina.net/u/569730/blog/382661