import datetime
import json
import os


def get_cache_filename(rank_id):
    # 生成缓存文件名，以年月日+rank_id命名
    date_str = datetime.datetime.now().strftime("%Y%m%d")
    return f"{date_str}_{rank_id}.json"

def read_cache(rank_id):
    # 从缓存文件中读取数据
    cache_filename = get_cache_filename(rank_id)
    if os.path.exists(cache_filename):
        with open(cache_filename, "r") as file:
            return json.load(file)
    return None

def write_cache(rank_id, data):
    # 将数据写入缓存文件
    cache_filename = get_cache_filename(rank_id)
    with open(cache_filename, "w") as file:
        json.dump(data, file)