• socketserver


     基于tcp的套接字,关键就是两个循环,一个链接循环,一个通信循环

    socketserver模块中分两大类:server类(解决链接问题)和request类(解决通信问题)

    server类:

    request类:

    继承关系:

     

    以下述代码为例,分析socketserver源码:

    ftpserver=socketserver.ThreadingTCPServer(('127.0.0.1',8080),FtpServer)
    ftpserver.serve_forever()

    查找属性的顺序:ThreadingTCPServer->ThreadingMixIn->TCPServer->BaseServer

    1. 实例化得到ftpserver,先找类ThreadingTCPServer的__init__,在TCPServer中找到,进而执行server_bind,server_active
    2. 找ftpserver下的serve_forever,在BaseServer中找到,进而执行self._handle_request_noblock(),该方法同样是在BaseServer中
    3. 执行self._handle_request_noblock()进而执行request, client_address = self.get_request()(就是TCPServer中的self.socket.accept()),然后执行self.process_request(request, client_address)
    4. 在ThreadingMixIn中找到process_request,开启多线程应对并发,进而执行process_request_thread,执行self.finish_request(request, client_address)
    5. 上述四部分完成了链接循环,本部分开始进入处理通讯部分,在BaseServer中找到finish_request,触发我们自己定义的类的实例化,去找__init__方法,而我们自己定义的类没有该方法,则去它的父类也就是BaseRequestHandler中找....

    源码分析总结:

    基于tcp的socketserver我们自己定义的类中的

    1.   self.server即套接字对象
    2.   self.request即一个链接
    3.   self.client_address即客户端地址

    基于udp的socketserver我们自己定义的类中的

    1.   self.request是一个元组(第一个元素是客户端发来的数据,第二部分是服务端的udp套接字对象),如(b'adsf', <socket.socket fd=200, family=AddressFamily.AF_INET, type=SocketKind.SOCK_DGRAM, proto=0, laddr=('127.0.0.1', 8080)>)
    2.   self.client_address即客户端地址
    #!/usr/bin/env python
    # -*- coding: utf-8 -*-
    # @Time    : 2018/05/04 15:11
    # @Author  : MJay_Lee
    # @File    : server.py
    # @Contact : limengjiejj@hotmail.com
    
    import socketserver
    
    # 通信循环
    class MytcpHandler(socketserver.BaseRequestHandler):
        def handle(self):
            print(self)
            print(self.request)
            while True:
                try:
                    data = self.request.recv(1024)
                    if not data: break
                    self.request.send(data.upper())
                except ConnectionResetError:
                    break
            self.request.close()
    
    if __name__ == '__main__':
        # 接收连接,(来一个连接,就创造一个线程对象并调该对象下的handle方法去服务此客户)
        server = socketserver.ThreadingTCPServer(('127.0.0.1',8080),MytcpHandler)
        # print(server) # <socketserver.ThreadingTCPServer object at 0x000000132630C0B8>
        # print(server.server_address) # ('127.0.0.1', 8080)
        # print(server.RequestHandlerClass) # <class '__main__.MytcpHandler'>
        # print(server.socket) # <socket.socket fd=380, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=0, laddr=('127.0.0.1', 8080)>
        server.serve_forever()
    基于TCP-服务端
    #!/usr/bin/env python
    # -*- coding: utf-8 -*-
    # @Time    : 2018/05/04 15:11
    # @Author  : MJay_Lee
    # @File    : client.py
    # @Contact : limengjiejj@hotmail.com
    
    import os
    import socket
    client = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
    client.connect(('127.0.0.1',8080))
    
    while True:
        msg = '%s is running' % os.getpid()
        client.send(msg.encode('utf-8'))
        reply_msg = client.recv(1024)
        print(reply_msg.decode('utf-8'))
    基于TCP-客户端
    #!/usr/bin/env python
    # -*- coding: utf-8 -*-
    # @Time    : 2018/05/04 17:40
    # @Author  : MJay_Lee
    # @File    : server.py
    # @Contact : limengjiejj@hotmail.com
    
    import socketserver
    
    # 通信循环
    class MyudpHandler(socketserver.BaseRequestHandler):
        def handle(self):
            # print(self)
            # print(self.request)
            # 区别于tcp,此处self.request接收到的内容为元组
            # (b'4208 is running', <socket.socket fd=360, family=AddressFamily.AF_INET, type=SocketKind.SOCK_DGRAM, proto=0, laddr=('127.0.0.1', 8080)>)
            msg = self.request[0]
            print('client发送来的数据',msg.decode('utf-8'))
            self.request[1].sendto(msg.upper(),self.client_address)
    
    if __name__ == '__main__':
        # 接收连接,(来一个连接,就创造一个线程对象并调该对象下的handle方法去服务此客户)
        server = socketserver.ThreadingUDPServer(('127.0.0.1', 8080), MyudpHandler)
        # print(server) # <socketserver.ThreadingUDPServer object at 0x00000021E29AA198>
        # print(server.server_address) # ('127.0.0.1', 8080)
        # print(server.RequestHandlerClass) # <class '__main__.MyudpHandler'>
        # print(server.socket) # <socket.socket fd=368, family=AddressFamily.AF_INET, type=SocketKind.SOCK_DGRAM, proto=0, laddr=('127.0.0.1', 8080)>
        server.serve_forever()
    基于UDP服务端
    #!/usr/bin/env python
    # -*- coding: utf-8 -*-
    # @Time    : 2018/05/04 17:41
    # @Author  : MJay_Lee
    # @File    : client.py
    # @Contact : limengjiejj@hotmail.com
    
    import os
    import socket
    client = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
    client.connect(('127.0.0.1',8080))
    
    while True:
        msg = '%s is running' % os.getpid()
        client.sendto(msg.encode('utf-8'),('127.0.0.1',8080))
        reply_msg = client.recv(1024)
        print(reply_msg.decode('utf-8'))
    基于UDP客户端
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  • 原文地址:https://www.cnblogs.com/limengjie0104/p/8991569.html
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