龙卷风长连接

Question

我能用tornado.web.RequestHandler实现“长连接(长连接，而不是长轮询)”吗？因为我需要包含连接，所以我需要接收客户端发送的“心消息”，那么，如果tornado.web.RequestHandler可以做到，我该怎么办？还有像这样的演示吗？

谢谢!

Answer 1

RequestHandler不适用于此，请改用WebSocketHandler。这是一个每秒从每个客户端接收心跳的示例应用程序：

import tornado.ioloop
import tornado.web
import tornado.websocket


class HeartBeatReceiver(tornado.websocket.WebSocketHandler):
    def open(self):
        pass

    def on_message(self, message):
        print message

    def on_close(self):
        pass


class Main(tornado.web.RequestHandler):
    def get(self):
        # This could be a template, too.
        self.write('''
<script>
function sendHeartBeat() {
    ws.send("heartbeat");
    setTimeout(sendHeartBeat, 1000);
}

ws = new WebSocket("ws://localhost:8888/websocket");
ws.onopen = sendHeartBeat;
</script>''')


application = tornado.web.Application([
    (r"/", Main),
    (r"/websocket", HeartBeatReceiver),
])

if __name__ == "__main__":
    application.listen(8888)
    tornado.ioloop.IOLoop.instance().start()