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分享WebSocket服务器在python中定期发送消息
我在python中有一个龙卷风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()
而客户是
<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>
我想定期向客户端收到消息.但是当我尝试这个时,我得到了这个错误：RunTimeError：超过最大递归深度.请帮我解决这个问题.另外,我们如何知道连接到服务器的客户端是什么？
...全文
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weixin_38061608 2019-09-12
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这是使用PeriodicCallback的最小示例.
import tornado.httpserver
import tornado.websocket
import tornado.ioloop
from tornado.ioloop import PeriodicCallback
import tornado.web
class WSHandler(tornado.websocket.WebSocketHandler):
def open(self):
self.callback = PeriodicCallback(self.send_hello, 120)
self.callback.start()
def send_hello(self):
self.write_message('hello')
def on_message(self, message):
pass
def on_close(self):
self.callback.stop()
application = tornado.web.Application([
(r'/', WSHandler),
])
if __name__ == "__main__":
http_server = tornado.httpserver.HTTPServer(application)
http_server.listen(8888)
tornado.ioloop.IOLoop.instance().start()
