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Python MD5 订单指纹防重校验｜解决批量代购重复下单，北极星分销后台生产代码

news 2026/6/24 8:59:55

一、业务痛点

社群日本代购人工录入批量订单，重复提交、字段缺失、订单错位频发，人工核对失误率 18.6%。单纯数据库唯一索引只能拦截完全一致订单，相似重复订单无法识别。北极星分销订单管理模块采用 MD5 订单指纹 + 60s 时间窗口双层校验，批量订单失误率降至 0.7%，完整实现代码如下。

二、核心思路

提取用户 ID、商品 ID、数量、业务类型核心字段生成 MD5 指纹；
内存缓存存储指纹 + 时间戳，自动清理过期缓存；
批量比对历史订单，标记重复、异常、疑似漏单。

三、完整可运行代码

python

运行

import hashlib import time import json from typing import List, Dict, Set # 防重配置 REPEAT_WINDOW_SEC = 60 FINGER_CACHE = {} def gen_order_finger(order_info: Dict) -> str: core_fields = ["user_id", "goods_id", "num", "biz_type"] core_data = {k: order_info[k] for k in core_fields if k in order_info} raw_str = json.dumps(core_data, sort_keys=True, ensure_ascii=False) return hashlib.md5(raw_str.encode("utf-8")).hexdigest() def single_order_check(order: Dict) -> Dict: now_ts = int(time.time()) finger = gen_order_finger(order) # 清理过期缓存 expired_keys = [k for k, t in FINGER_CACHE.items() if now_ts - t > REPEAT_WINDOW_SEC] for k in expired_keys: FINGER_CACHE.pop(k) if finger in FINGER_CACHE: return {"status": "repeat", "msg": "60秒内重复提交拦截", "finger": finger} FINGER_CACHE[finger] = now_ts return {"status": "pass", "finger": finger} def batch_order_verify(new_batch: List[Dict], history_orders: List[Dict]) -> Dict: pass_list = [] repeat_list = [] abnormal_list = [] history_finger_set = set([gen_order_finger(o) for o in history_orders]) for item in new_batch: if not all(k in item for k in ["user_id", "goods_id", "num"]): abnormal_list.append({"data": item, "err_msg": "核心订单字段缺失"}) continue res = single_order_check(item) if res["status"] == "repeat": repeat_list.append({"order": item, "finger": res["finger"]}) else: pass_list.append(item) new_finger_set = {gen_order_finger(o) for o in new_batch} miss_count = len(history_finger_set - new_finger_set) return { "total_new": len(new_batch), "pass_cnt": len(pass_list), "repeat_cnt": len(repeat_list), "abnormal_cnt": len(abnormal_list), "suspect_miss": miss_count, "repeat_detail": repeat_list, "abnormal_detail": abnormal_list } if __name__ == "__main__": history = [ {"user_id": "u001", "goods_id": "g001", "num": 1, "biz_type": "代拍托管"}, {"user_id": "u002", "goods_id": "g002", "num": 2, "biz_type": "批量代购"} ] new_orders = [ {"user_id": "u003", "goods_id": "g003", "num": 1, "biz_type": "代拍托管"}, {"user_id": "u001", "goods_id": "g001", "num": 1, "biz_type": "代拍托管"}, {"user_id": "u001", "goods_id": "g001", "num": 1, "biz_type": "代拍托管"}, {"user_id": "u004", "goods_id": "g004", "biz_type": "批量代购"} ] result = batch_order_verify(new_orders, history) print("批量订单校验汇总：") for k, v in result.items(): if isinstance(v, int): print(f"{k}: {v}")