我有一个用Python编写的Tornado Web服务器:
import tornado.httpserver
import tornado.websocket
import tornado.ioloop
from tornado.ioloop import IOLoop
import tornado.web
import time
import threading
import sys
from datetime import datetime
from datetime import timedelta
def sample():
print 'hiiiii'
threading.Timer(10, sample).start()
class WSHandler(tornado.websocket.WebSocketHandler):
def open(self):
print 'new connection'
def on_message(self, message):
self.write_message(message)
self.msg('hellooooooo')
print message
def msg(self,message):
self.write_message(message)
threading.Timer(10, self.msg('in timer')).start()
print 'in msg'+message
def on_close(self):
print 'connection closed'
application = tornado.web.Application([
(r'/', WSHandler),
])
if __name__ == "__main__":
http_server = tornado.httpserver.HTTPServer(application)
http_server.listen(8888)
interval_ms=120
main_loop=tornado.ioloop.IOLoop.instance()
main_loop.start()
客户端是指
<html>
<head>
<script>
function fun(){
alert("in fun()");
var val=document.getElementById("txt");
var ws = new WebSocket("ws://localhost:8888");
ws.onopen = function(evt) { alert("Connection open ...");
ws.send(val.value); };
ws.onmessage = function(evt) {
alert("from server: "+evt.data);
}
ws.onclose = function(evt) {
alert("Connection closed.");
}
}
</script>
</head>
<body bgcolor="#FFFFFF">
<input type="text" id="txt" />
<button onClick="fun()">click</button>
</body>
</html>
我希望能够定时向客户端发送消息。但是尝试后出现以下错误:RunTimeError :Maximum Recursion Depth Exceeded.
请帮我解决这个问题。另外,我们如何知道哪些客户端已连接到服务器?
threading
。看一下IOLoop.add_timeout
和特别是tornado.ioloop.PeriodicCallback
。不要忘记在连接关闭时删除回调函数。 - Thijs van Dien