Python SocketServer 分析

最新推荐文章于 2025-09-16 10:18:39 发布

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#server #socket #class #thread #python #tcp

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本文详细解析了Python SocketServer模块的工作原理及内部流程。通过展示BaseServer、TCPServer、UDPServer等类间的继承关系与函数调用流程，帮助读者理解SocketServer模块如何处理TCP与UDP请求，并介绍了ForkingMixIn与ThreadingMixIn混合类的作用。

研究了一下SocketServer模块，记录下每个类下函数的调用关系，加深了解

class BaseServer:
========================================================
+ __init__ (绑定server_address, RequestHandlerClass)

+ server_forever
   + handle_request
      + get_request (子类中具体实现)
         + verify_request
         + try: process_request
                  + finish_request
                      + RequestHandlerClass (实际处理方法)
                  + close_request
         + except:
                  + handle_error
                  + close_request

class TCPServer(BaseServer):
========================================================
+ __init__
   + BaseServer.__init__
   + init socket
   + server_bind       (socket bind)
   + server_activate (socket listen)

+ server_forever
   + handle_request
      + get_request   (tcp: socket.accept)
         + ……
         + ……

class UDPServer(TCPServer):
========================================================
+ __init__
   + BaseServer.__init__
   + init socket
   + server_bind       (socket bind)
   + server_activate (pass, do nothing)

+ server_forever
   + handle_request
      + get_request   (udp: socket.recvfrom)
         + ……
         + ……

class ForkingMixIn:
========================================================
+ process_request   (fork new process and release if not used)
   + ……
   + finish_request
      + RequestHandlerClass
   + ……

class ThreadingMixIn:
========================================================
+ process_request   (create new thread and handle method)
   + ……
   + finish_request
      + RequestHandlerClass
   + ……

class BaseRequestHandler:
========================================================
+ __init__
+ setup
+ handle (实际处理的代码，需要自己实现)
+ finish

以上模块基于Python 2.5，背景色代码为子类中改写的函数