udp接收脚本

import socket
import sys
import string

LOWERCASE_STR = string.ascii_lowercase
LOWERCASE_LEN = len(string.ascii_lowercase)
MAX_SIZE = 4096

def str_gen(len):
    msgstr = ''
    for i in range(len):
        msgstr += LOWERCASE_STR[i % LOWERCASE_LEN]
    return msgstr


def udp_recv(local_ip, local_port):
    udp_sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    udp_sock.bind((local_ip, local_port))
    
    while 1:
        recv_data, d_addr = udp_sock.recvfrom(MAX_SIZE)
        recv_msg = recv_data.decode('utf-8')
        # print("Recv message from {0}: {1}".format(d_addr, recv_msg))
        print("Recv {0} bytes data from {1}".format(len(recv_data), d_addr))

        exp_msg = str_gen(len(recv_msg))
        if (recv_msg != exp_msg):
            print("Test failed!\nReceived: '{0}'\nExpected: '{1}'".format(recv_msg, exp_msg))
            udp_sock.close()
            print("Closed UDP socket.")

            with open('udp_recevied_' + str(d_addr[1]), 'w') as f:
                f.write(recv_msg)

            with open('udp_expected_' + str(d_addr[1]), 'w') as f:
                f.write(exp_msg)

            break


# Entry
if __name__ == "__main__":
    if (len(sys.argv) < 3):
        print("Please input local IP & port!")
        exit(-1)

    l_ip = sys.argv[1]
    l_port = int(sys.argv[2])

    try:
        print("Create UDP socket...")
        udp_recv(l_ip, l_port)

    except Exception as exp:
        print("Exception error: ", exp)
        exit(-1)
    else:
        exit(0)