参考:https://blog.csdn.net/qq_33733970/article/details/79153938
1.功能简介
- socketserver模块是对socket模块的再封装,用于简化网络服务器的编写,并且实现了多用户的在线,即多并发
2.功能分类
#处理链路问题server类 +------------+ | BaseServer | +------------+ | v +-----------+ +------------------+ | TCPServer |------->| UnixStreamServer | +-----------+ +------------------+ | v +-----------+ +--------------------+ | UDPServer |------->| UnixDatagramServer | +-----------+ +--------------------+
#处理多线程并发:
"ThreadingMixIn","ThreadingUDPServer","ThreadingTCPServer"
#处理多进程并发:
"ForkingUDPServer","ForkingTCPServer", "ForkingMixIn"
#处理通信问题request类
"BaseRequestHandler", "StreamRequestHandler","DatagramRequestHandler"
3.类继承关系
●处理多线程并发相关类继承关系
●处理多进程并发相关类继承关系
●处理通信request相关类继承关系
4.如何创建socketserver服务
①创建一个请求处理类(FtpServer),继承BaseRequestHandler类,并重写父类handle()方法; ②实例化服务器类(TCPServer、UDPServer、UnixStreamServer或UnixDatagramServer),传入(IP, 端口)及定制的请求处理类(FtpServer); ③server.handle_requese() #只处理一个请求 ④server.server_forever() #处理多个请求 ⑤server.server_close() #关闭socket
5.基于TCP协议实现的FTPServer服务调用过程解析
import socketserver class FtpServer(socketserver.BaseRequestHandler): def handle(self): pass
ftpserver = socketserver.ThreadingTCPServer(('127.0.0.1', 8080), FtpServer) ftpserver.serve_forever()
1.属性解析顺序
ThreadingTCPServer-->ThreadingMixIn-->TCPServer-->BaseServer
2.调用TCPSever类的__init__方法获取实例化对象
class TCPServer(BaseServer): def __init__(self, server_address, RequestHandlerClass, bind_and_activate=True): self.server_bind() self.server_activate()
3.调用BaseServer类的server_forever方法,并处理请求
class BaseServer: def serve_forever(self, poll_interval=0.5): self._handle_request_noblock() def _handle_request_noblock(self): """相当于TCPServer中的self.socket.accept()""" request, client_address = self.get_request() """接收请求,并处理来次客户端的请求""" self.process_request(request, client_address)
4.调用ThreadingMixIn类的process_request方法,执行process_request_thread方法
class ThreadingMixIn: def process_request_thread(self, request, client_address): self.finish_request(request, client_address) def process_request(self, request, client_address): """开启新线程处理请求""" t = threading.Thread(target = self.process_request_thread, args = (request, client_address)) t.daemon = self.daemon_threads t.start()
5.调用BaseServer类的finish_request方法,完成请求,至此链接循环的处理完成,开始通讯循环
def finish_request(self, request, client_address): """通过实例化定制类(FtpServer)去结束一个请求""" self.RequestHandlerClass(request, client_address, self)
6.调用BaseRequestHandler类的__init__方法
class BaseRequestHandler: def __init__(self, request, client_address, server): """
调用了对象自己的handle()方法
服务端跟客户端所有的交互都在重写的handle()方法中
""" self.handle()