import os
import asyncio
from datetime import datetime, timedelta

class FileCleaner:
    def __init__(self, target_dir, prefix, retention_hours):
        self.target_dir = target_dir
        self.prefix = prefix
        self.retention_hours = retention_hours

    async def periodic_cleanup(self):
        while True:
            try:
                self.cleanup_old_files()
            except Exception as e:
                print(f"清理文件时出错: {str(e)}")
            await asyncio.sleep(3600)

    def cleanup_old_files(self):
        if not os.path.exists(self.target_dir):
            return
        cutoff_time = datetime.now() - timedelta(hours=self.retention_hours)
        for filename in os.listdir(self.target_dir):
            if not filename.startswith(self.prefix):
                continue
            file_path = os.path.join(self.target_dir, filename)
            file_time = datetime.fromtimestamp(os.path.getctime(file_path))
            if file_time < cutoff_time:
                try:
                    os.remove(file_path)
                    print(f"已删除过期文件: {filename}")
                except Exception as e:
                    print(f"删除文件失败 {filename}: {str(e)}")