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

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. 

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.

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()