tornado websocket

🕕 Sun, 09 Nov 2014 by pyList

最近在网上找了些websocket的资料看了下，node和tornado等等本身已经实现了websocket的封装，所以使用起来会比较简单，php如果想要写websocket还需要自己跑一整套流程，比较麻烦。

根据网上的资料写了一个简单的websocket的demo，果真炫酷掉渣天，我是用tornado，网上多是实现实时聊天室的例子，想要实现点对点的聊天功能还需要在send函数那里加条件，目测是根据浏览器用户的id去判断的。代码如下：

服务端代码：

#!/usr/bin/python
#coding:utf-8
import os.path

import tornado.httpserver
import tornado.web
import tornado.ioloop
import tornado.options
import tornado.httpclient
import tornado.websocket

import json
class IndexHandler(tornado.web.RequestHandler):
  def get(self):
    self.render("index.html")

class SocketHandler(tornado.websocket.WebSocketHandler):
  """docstring for SocketHandler"""
  clients = set()

  @staticmethod
  def send_to_all(message):
      for c in SocketHandler.clients:
          c.write_message(json.dumps(message))

  def open(self):
      self.write_message(json.dumps({
          'type': 'sys',
          'message': 'Welcome to WebSocket',
      }))
      SocketHandler.send_to_all({
          'type': 'sys',
          'message': str(id(self)) + ' has joined',
      })
      SocketHandler.clients.add(self)

  def on_close(self):
      SocketHandler.clients.remove(self)
      SocketHandler.send_to_all({
          'type': 'sys',
          'message': str(id(self)) + ' has left',
      })

  def on_message(self, message):
    SocketHandler.send_to_all({
  'type': 'user',
  'id': id(self),
  'message': message,
        })
    
##MAIN
if __name__ == '__main__':
  app = tornado.web.Application(
    handlers=[
      (r"/", IndexHandler),
      (r"/chat", SocketHandler)
    ],
    debug = True,
    template_path = os.path.join(os.path.dirname(__file__), "templates"),
        static_path = os.path.join(os.path.dirname(__file__), "static")
  )
  app.listen(8000)
  tornado.ioloop.IOLoop.instance().start()

客户端代码：

<html>
<head>
<script type="text/javascript">
var ws = new WebSocket("ws://localhost:8000/chat");
ws.onmessage = function(event) {
  console.log(event);
}
function send() {
  ws.send(document.getElementById('chat').value );
}
</script>
</head>

<body>
  <div>
    hello
    <input id="chat">
    <button  onclick="send()">send</button>
  </div>	
</body>
</html>

tornado websocket

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