Tornado websocket 处理程序，self.close() 正在关闭连接而不触发 on_close() 方法

问题描述

我是 (python, stackoverflow, tornado) 的新手，所以请耐心等待 :).纠正我.

im new at (python, stackoverflow, tornado) , so please, be patient :). Correct me.

我正在实时应用程序上使用 Tornado.当我在 Websocket 处理程序类中调用 self.close() 时，没有启动 on_close 方法，这次我做了一个小包装，解决了问题并(例如)丢弃了连接的代理(纯 avascript wss api 客户端)正确.

Im working with tornado on a real-time app. When i call self.close() inside the Websocket handler class , the on_close method is not fired up , for this time i did a little wrapper , fixing the problem and (for example) discarding that connected agent (pure avascript wss api client) correctly.

所有网络问题都被丢弃了，因为我糟糕的包装器运行良好，而且我在 LAN 环境中.

All network problems are discarded , since my poor wrapper is working nicely and im in a LAN enviroment.

有人有同样的问题吗?不解释就睡不着.

is someone having the same problem ? I cant sleep without an explanation.

谢谢你，真的.

## imports and other stuff

AGENTS = set()

class BackofficeWSSRailMain(tornado.websocket.WebSocketHandler):

     def on_open(self):
       pass

     def on_message(self,raw_message):
       json_msg=json.loads(raw_message)
       login = function_that_process_login(json_msg)

       if login == True:
          AGENTS.add(self)
          self.write_message("ok")
       else:
          self.write_message("nologin")
          self.close()         ### this part should fireup
                               ### the on_close method but nothing
                               ### happens so AGENT is not discarded.
                               ### here is when i actually call on_close_wrapper(),
                               ### the method below.

     def on_close_wrapper(self):

       self.close()            ### this is my actual solution ,
                               ### waiting for more research.
       self.on_close()

     def on_close(self):

       AGENTS.discard(self)

   ## Calling ioloop ...

推荐答案

self.on_close 当且仅当客户端关闭它的 websocket 连接端时才会执行.试试看:如果您打开包含连接到您的服务器的 Javascript 客户端的网页，然后关闭该页面，on_close 将运行.如果您在服务器代码中调用 self.close，on_close 不应运行.

self.on_close is executed if and only if the client closes its side of the websocket connection. Try it: If you open a web page that contains a Javascript client which connects to your server, then you close the page, on_close will run. on_close is not supposed to run if you call self.close in your server code.

您的包装器是您问题的合理解决方案；也就是说，这是一种合理的方式，可以确保在您调用 self.close 或客户端断开连接时运行相同的代码.

Your wrapper is a reasonable solution to your problem; that is, it's a reasonable way to ensure that the same code runs either when you call self.close or when the client disconnects.

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