Python学习——socketserver模块

socketserver模块就是socket模块的封装。

The socketserver module simplifies the task of writing network servers.

socketserver一共有这么几种类型

1	class socketserver.TCPServer(server_address, RequestHandlerClass, bind_and_activate=True)

This uses the Internet TCP protocol, which provides for continuous streams of data between the client and server. 

1	class socketserver.UDPServer(server_address, RequestHandlerClass, bind_and_activate=True)

This uses datagrams, which are discrete packets of information that may arrive out of order or be lost while in transit. The parameters are the same as for TCPServer.

1 2	class socketserver.UnixStreamServer(server_address, RequestHandlerClass, bind_and_activate=True) class socketserver.UnixDatagramServer(server_address, RequestHandlerClass,bind_and_activate=True)

These more infrequently used classes are similar to the TCP and UDP classes, but use Unix domain sockets; they’re not available on non-Unix platforms. The parameters are the same as for TCPServer.

There are five classes in an inheritance diagram, four of which represent synchronous servers of four types:

+------------+
| BaseServer |
+------------+
      |
      v
+-----------+        +------------------+
| TCPServer |------->| UnixStreamServer |
+-----------+        +------------------+
      |
      v
+-----------+        +--------------------+
| UDPServer |------->| UnixDatagramServer |
+-----------+        +--------------------+

创建一个socketserver 至少分以下几步:

First, you must create a request handler处理类 class by subclassing the BaseRequestHandler class and overriding覆盖
its handle() method; this method will process incoming requests. 　　
你必须自己创建一个请求处理类，并且这个类要继承BaseRequestHandler,并且还有重写父亲类里的handle()
Second, you must instantiate实例化 one of the server classes, passing it the server’s address and the request handler class.
你必须实例化TCPServer ，并且传递server ip 和 你上面创建的请求处理类 给这个TCPServer
Then call the handle_request() or serve_forever() method of the server object to process one or many requests.
server.handle_request() #只处理一个请求
server.serve_forever() #处理多个一个请求，永远执行

让你的socketserver并发起来， 必须选择使用以下一个多并发的类

class socketserver.ForkingTCPServer

class socketserver.ForkingUDPServer

class socketserver.ThreadingTCPServer

class socketserver.ThreadingUDPServer

基本的socketserver代码

import socketserver

class MyTCPHandler(socketserver.BaseRequestHandler):
    def handle(self):
        while True:
            try:
                self.data = self.request.recv(1024).strip()
                print("{} wrote:".format(self.client_address[0]))
                print(self.data)
                self.request.send(self.data.upper())
            except ConnectionResetError as e:
                print("err",e)
                break
if __name__ == "__main__":
    HOST, PORT = "localhost", 9999
    # Create the server, binding to localhost on port 9999
    server = socketserver.ThreadingTCPServer((HOST, PORT), MyTCPHandler)
    server.serve_forever()