我能否实现"长连接(持久连接,不长时间轮询)"使用tornado.web.RequestHandler?因为我需要包含连接,我需要接收"心脏消息"由客户端发送,所以,如果tornado.web.RequestHandler可以做到,我该怎么办?有这样的演示吗?
谢谢!
答案 0 :(得分:2)
RequestHandler不适合这种情况,请改用WebSocketHandler。这是一个示例应用程序,每秒钟从每个客户端接收一次心跳:
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()