浅析socketserver源码

又看了看ftp作业的要求, 发现不让用socketserver...这么好用的竟然不让用

源码执行流程

自己模仿一个(提取代码)

服务器类

import socket
import threading
import selectors

class TCPServer:
    def __init__(self, server_address, RequestHandlerClass, bind_and_activate=True):

        self.server_address = server_address  # IP端口
        self.RequestHandlerClass = RequestHandlerClass  # 处理handelr
        self.__is_shut_down = threading.Event()
        self.__shutdown_request = False
        self.socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        self.socket.bind(self.server_address) # 绑定IP, 端口
        self.socket.listen(5)

    def serve_forever(self, poll_interval=0.5):
        self.__is_shut_down.clear()  # 清除事件标志
        print("serve_forever")
        try:
            with selectors.SelectSelector() as selector:  # 类似select的监听
                selector.register(self, selectors.EVENT_READ)  #

                while not self.__shutdown_request:  # 循环去监听
                    print(111111111)
                    ready = selector.select(poll_interval)
                    if ready:
                        self._handle_request_noblock()
        except:
            raise

    def _handle_request_noblock(self):
        request, client_address = self.socket.accept()
        try:
            self.process_request(request, client_address)
        except:
            self.shutdown_request(request)

    def process_request(self, request, client_address):
        t = threading.Thread(target=self.process_request_thread,
                             args=(request, client_address))
        t.start()

    def process_request_thread(self, request, client_address):
        self.finish_request(request, client_address)

    def finish_request(self, request, client_address):
        self.RequestHandlerClass(request, client_address, self)

    def shutdown_request(self, request):
        request.colse()

    def fileno(self):
        return self.socket.fileno()

handle

class Handle:
    def __init__(self, request, client_address, server):
        self.request = request # 请求
        self.client_address = client_address #
        self.server = server # 服务器
        try:
            self.handle() # 初始化时就会去执行handle()方法
        finally:
            self.finish()

    def handle(self):
        pass

    def finish(self):
        pass

ps:

　　fileno()方法, select实际上是监听的套接字该方法, 因为我们传入的不是套接字, 所以我们实现了该方法, 并且返回套接字的状态