Python监视QNAP FTP目录的更改并发送UDP消息

import ftplib
import os
import socket

# FTP服务器信息
ftp_host = 'ftp.example.com'
ftp_user = 'username'
ftp_passwd = 'password'
ftp_dir = '/path/to/directory'

# UDP服务器信息
udp_host = 'udp.example.com'
udp_port = 12345

# 存储先前文件元数据的字典
previous_files = {}

def get_file_metadata(file_path):
    file_stat = os.stat(file_path)
    return {
        'mtime': file_stat.st_mtime,  # 最后修改时间
        'size': file_stat.st_size  # 文件大小
    }

def send_udp_message(message):
    sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    sock.sendto(message.encode(), (udp_host, udp_port))
    sock.close()

# 连接到FTP服务器
ftp = ftplib.FTP(ftp_host)
ftp.login(ftp_user, ftp_passwd)

# 切换到目标FTP目录
ftp.cwd(ftp_dir)

# 持续监视目录变化
while True:
    file_list = []
    ftp.retrlines('LIST', file_list.append)

    for line in file_list:
        file_info = line.split()
        file_name = file_info[-1]
        file_path = os.path.join(ftp_dir, file_name)

        if file_path not in previous_files:
            # 新文件添加到previous_files字典中
            previous_files[file_path] = get_file_metadata(file_path)
        else:
            previous_metadata = previous_files[file_path]
            current_metadata = get_file_metadata(file_path)

            if previous_metadata != current_metadata:
                # 文件元数据发生变化，发送UDP消息
                message = f"File {file_name} in {ftp_dir} has changed"
                send_udp_message(message)

                # 更新文件元数据
                previous_files[file_path] = current_metadata