• 认证客户端的链接与socketserver实现并发


    from socket import *
    import hmac,os
    
    secret_key=b'linhaifeng bang bang bang'
    def conn_auth(conn):
        '''
        认证客户端链接
        :param conn:
        :return:
        '''
        print('开始验证新链接的合法性')
        msg=os.urandom(32)
        conn.sendall(msg)
        h=hmac.new(secret_key,msg)
        digest=h.digest()
        respone=conn.recv(len(digest))
        return hmac.compare_digest(respone,digest)
    
    def data_handler(conn,bufsize=1024):
        if not conn_auth(conn):
            print('该链接不合法,关闭')
            conn.close()
            return
        print('链接合法,开始通信')
        while True:
            data=conn.recv(bufsize)
            if not data:break
            conn.sendall(data.upper())
    
    def server_handler(ip_port,bufsize,backlog=5):
        '''
        只处理链接
        :param ip_port:
        :return:
        '''
        tcp_socket_server=socket(AF_INET,SOCK_STREAM)
        tcp_socket_server.bind(ip_port)
        tcp_socket_server.listen(backlog)
        while True:
            conn,addr=tcp_socket_server.accept()
            print('新连接[%s:%s]' %(addr[0],addr[1]))
            data_handler(conn,bufsize)
    
    if __name__ == '__main__':
        ip_port=('127.0.0.1',9999)
        bufsize=1024
        server_handler(ip_port,bufsize)
    服务端
    from socket import *
    import hmac,os
    
    secret_key=b'linhaifeng bang bang bang'
    def conn_auth(conn):
        '''
        验证客户端到服务器的链接
        :param conn:
        :return:
        '''
        msg=conn.recv(32)
        h=hmac.new(secret_key,msg)
        digest=h.digest()
        conn.sendall(digest)
    
    def client_handler(ip_port,bufsize=1024):
        tcp_socket_client=socket(AF_INET,SOCK_STREAM)
        tcp_socket_client.connect(ip_port)
    
        conn_auth(tcp_socket_client)
    
        while True:
            data=input('>>: ').strip()
            if not data:continue
            if data == 'quit':break
    
            tcp_socket_client.sendall(data.encode('utf-8'))
            respone=tcp_socket_client.recv(bufsize)
            print(respone.decode('utf-8'))
        tcp_socket_client.close()
    
    if __name__ == '__main__':
        ip_port=('127.0.0.1',9999)
        bufsize=1024
        client_handler(ip_port,bufsize)
    客户端

    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:

    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
    import socketserver
    import struct
    import json
    import os
    class FtpServer(socketserver.BaseRequestHandler):
        coding='utf-8'
        server_dir='file_upload'
        max_packet_size=1024
        BASE_DIR=os.path.dirname(os.path.abspath(__file__))
        def handle(self):
            print(self.request)
            while True:
                data=self.request.recv(4)
                data_len=struct.unpack('i',data)[0]
                head_json=self.request.recv(data_len).decode(self.coding)
                head_dic=json.loads(head_json)
                # print(head_dic)
                cmd=head_dic['cmd']
                if hasattr(self,cmd):
                    func=getattr(self,cmd)
                    func(head_dic)
        def put(self,args):
            file_path = os.path.normpath(os.path.join(
                self.BASE_DIR,
                self.server_dir,
                args['filename']
            ))
    
            filesize = args['filesize']
            recv_size = 0
            print('----->', file_path)
            with open(file_path, 'wb') as f:
                while recv_size < filesize:
                    recv_data = self.request.recv(self.max_packet_size)
                    f.write(recv_data)
                    recv_size += len(recv_data)
                    print('recvsize:%s filesize:%s' % (recv_size, filesize))
    
    
    ftpserver=socketserver.ThreadingTCPServer(('127.0.0.1',8080),FtpServer)
    ftpserver.serve_forever()
    FtpServer
    import socket
    import struct
    import json
    import os
    
    
    
    class MYTCPClient:
        address_family = socket.AF_INET
    
        socket_type = socket.SOCK_STREAM
    
        allow_reuse_address = False
    
        max_packet_size = 8192
    
        coding='utf-8'
    
        request_queue_size = 5
    
        def __init__(self, server_address, connect=True):
            self.server_address=server_address
            self.socket = socket.socket(self.address_family,
                                        self.socket_type)
            if connect:
                try:
                    self.client_connect()
                except:
                    self.client_close()
                    raise
    
        def client_connect(self):
            self.socket.connect(self.server_address)
    
        def client_close(self):
            self.socket.close()
    
        def run(self):
            while True:
                inp=input(">>: ").strip()
                if not inp:continue
                l=inp.split()
                cmd=l[0]
                if hasattr(self,cmd):
                    func=getattr(self,cmd)
                    func(l)
    
    
        def put(self,args):
            cmd=args[0]
            filename=args[1]
            if not os.path.isfile(filename):
                print('file:%s is not exists' %filename)
                return
            else:
                filesize=os.path.getsize(filename)
    
            head_dic={'cmd':cmd,'filename':os.path.basename(filename),'filesize':filesize}
            print(head_dic)
            head_json=json.dumps(head_dic)
            head_json_bytes=bytes(head_json,encoding=self.coding)
    
            head_struct=struct.pack('i',len(head_json_bytes))
            self.socket.send(head_struct)
            self.socket.send(head_json_bytes)
            send_size=0
            with open(filename,'rb') as f:
                for line in f:
                    self.socket.send(line)
                    send_size+=len(line)
                    print(send_size)
                else:
                    print('upload successful')
    
    
    
    
    client=MYTCPClient(('127.0.0.1',8080))
    
    client.run()
    FtpClient
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  • 原文地址:https://www.cnblogs.com/wanghaohao/p/7428367.html
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