ThreadingTCPServer 如何设置端口重用

一个典型的TCPServer的建立

    #ThreadingTCPServer从ThreadingMixIn和TCPServer继承
    #class ThreadingTCPServer(ThreadingMixIn, TCPServer): pass
    server = ThreadingTCPServer(addr, MyStreamRequestHandlerr)
    server.serve_forever()

•     #ThreadingTCPServer从ThreadingMixIn和TCPServer继承
      #class ThreadingTCPServer(ThreadingMixIn, TCPServer): pass
      server = ThreadingTCPServer(addr, MyStreamRequestHandlerr)
      server.serve_forever()

查看SocketServer.py的实现

    def __init__(self, server_address, RequestHandlerClass, bind_and_activate=True):
        """Constructor.  May be extended, do not override."""
        BaseServer.__init__(self, server_address, RequestHandlerClass)
        self.socket = socket.socket(self.address_family,
                                    self.socket_type)
        if bind_and_activate:
            self.server_bind()
            self.server_activate()

    def server_bind(self):
        """Called by constructor to bind the socket.

        May be overridden.

        """
        if self.allow_reuse_address:
            self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
        self.socket.bind(self.server_address)
        self.server_address = self.socket.getsockname()

•    def __init__(self, server_address, RequestHandlerClass, bind_and_activate=True):
          """Constructor.  May be extended, do not override."""
          BaseServer.__init__(self, server_address, RequestHandlerClass)
          self.socket = socket.socket(self.address_family,
                                      self.socket_type)
          if bind_and_activate:
              self.server_bind()
              self.server_activate()
  
      def server_bind(self):
          """Called by constructor to bind the socket.
  
          May be overridden.
  
          """
          if self.allow_reuse_address:
              self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
          self.socket.bind(self.server_address)
          self.server_address = self.socket.getsockname()

可以看到，在init初始化里面就已经进行了bind操作，之后再单独设置server的socket选项将不起作用，这就是为什么很多人遇到了直接使用对象的setsockopt方法感觉没有生效，端口有TIME_WAIT的状态，再次运行程序仍然会报Address Already In Use 的错误。

server.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

• server.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

解决方案：

方案一

继承SocketServer.ThreadingTCPServer，在init之前设置allow_reuse_address = True（默认为False）

class EchoServer(SocketServer.ThreadingTCPServer):
    allow_reuse_address = True
    daemon_threads = True
    def __init__(self, server_address, RequestHandlerClass):
        """Set up an initially empty mapping between a user' s nickname
        and the file-like object used to send data to that user."""
        SocketServer.ThreadingTCPServer.__init__(self, server_address, RequestHandlerClass)

• class EchoServer(SocketServer.ThreadingTCPServer):
      allow_reuse_address = True
      daemon_threads = True
      def __init__(self, server_address, RequestHandlerClass):
          """Set up an initially empty mapping between a user' s nickname
          and the file-like object used to send data to that user."""
          SocketServer.ThreadingTCPServer.__init__(self, server_address, RequestHandlerClass)

方案二

重载Server_bind,在bind之前设置socket选项

    def server_bind(self):
        """Called by constructor to bind the socket.

        May be overridden.

        """
        self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
        self.socket.bind(self.server_address)
        self.server_address = self.socket.getsockname()

原文地址：https://blog.csdn.net/northwood/article/details/46455825