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Python 函数调用限制 装饰器 | 防并发利器

  • 2026-03-26 20:22:22
Python 函数调用限制 装饰器 | 防并发利器

你是否遇到过这样的问题?

  • • 用户重复点击提交订单按钮
  • • 短信接口被恶意刷屏
  • • 后台任务意外并发执行

今天分享一个绝妙的解决方案:一个同时支持同步、异步的函数调用限制装饰器!

核心特性

  • • 严格单次调用限制 - 函数执行完成前只能被调用一次
  • • 线程安全 - 使用 threading.Lock() 保证多线程环境安全
  • • 同步/异步兼容 - 自动识别,无需手动指定
  • • 灵活回调机制 - 成功/拒绝都有专属回调
  • • 快速失败策略 - 冲突时立刻放弃,不排队等候

应用场景

  • • GUI 应用:防止按钮被重复点击
  • • 爬虫任务:限制并发请求频率
  • • 定时任务:避免任务重叠执行
  • • Web 接口:防止订单重复提交、短信刷屏

函数级

import asyncioimport inspectimport threadingimport timefrom functools import wrapsfrom typing importCallableOptionalAnydefsingle_call(        timeout: float = 0,        on_success: Optional[Callable[..., Any]] = None,        on_rejected: Optional[Callable[..., Any]] = None,        reject_result: Any = None,):"""    函数调用限制装饰器    参数:        timeout: 两次允许执行的最小时间间隔(秒), 0表示只限制执行期间。            timeout = 0: 仅限制函数不能同时执行(前一次执行完成后才能开始下一次)            timeout > 0: 即使前一次执行已完成,仍需等待设定的时间间隔后才允许再次执行        on_success: 成功执行后的回调函数        on_rejected: 被拒绝执行时的回调函数        reject_result: 被拒绝时返回的默认值    """defdecorator(func):        is_running = False        last_run_time = 0.0        lock = threading.Lock()if inspect.iscoroutinefunction(func):            @wraps(func)asyncdefasync_wrapped(*args, **kwargs):nonlocal is_running, last_run_time                current_time = time.time()                should_reject = Falsewith lock:if is_running or (current_time - last_run_time < timeout):                        should_reject = Trueelse:                        is_running = True# 如果被拒绝,执行回调if should_reject:if on_rejected:try:if inspect.iscoroutinefunction(on_rejected):await on_rejected(*args, **kwargs)else:                                on_rejected(*args, **kwargs)except Exception as e:print(f"拒绝回调错误: {e}")return reject_result# 执行原函数和成功回调try:                    result = await func(*args, **kwargs)if on_success:try:if inspect.iscoroutinefunction(on_success):await on_success(*args, **kwargs)else:                                on_success(*args, **kwargs)except Exception as e:print(f"成功回调错误: {e}")return resultfinally:# 函数执行完毕后,恢复状态并记录完成时间(用于timeout冷却)with lock:                        is_running = False                        last_run_time = time.time()return async_wrappedelse:            @wraps(func)defsync_wrapped(*args, **kwargs):nonlocal is_running, last_run_time                current_time = time.time()                should_reject = Falsewith lock:if is_running or (current_time - last_run_time < timeout):                        should_reject = Trueelse:                        is_running = Trueif should_reject:if on_rejected:try:if inspect.iscoroutinefunction(on_rejected):raise ValueError("同步函数不允许使用异步的 on_rejected 回调")                            on_rejected(*args, **kwargs)except Exception as e:print(f"拒绝回调错误: {e}")return reject_resulttry:                    result = func(*args, **kwargs)if on_success:try:if inspect.iscoroutinefunction(on_success):raise ValueError("同步函数不允许使用异步的 on_success 回调")                            on_success(*args, **kwargs)except Exception as e:print(f"成功回调错误: {e}")return resultfinally:with lock:                        is_running = False                        last_run_time = time.time()return sync_wrappedreturn decorator

多线程环境下的同步函数调用示例

import threadingimport timedefsuccess_handler(num):print(f"线程 {num} 执行完毕")defrejected_callback(num):print(f'线程 {num} 被拒绝了')@single_call(on_rejected=rejected_callback, on_success=success_handler, timeout=1)defworker(num):print(f'线程 {num} 开始')    time.sleep(2)print(f'线程 {num} 结束')threads = []for i inrange(4):    t = threading.Thread(target=worker, args=(i,))    threads.append(t)    t.start()for t in threads:    t.join()threading.Thread(target=worker, args=(4,)).start()"""线程 0 开始线程 1 被拒绝了线程 2 被拒绝了线程 3 被拒绝了线程 0 结束线程 4 开始线程 4 结束"""

异步函数在多线程环境中的调用示例

import asyncioimport threadingasyncdefasync_success_callback(num):print(f"线程 {num} 操作成功")asyncdefasync_reject_callback(num):print(f"线程 {num} 被拒绝")@single_call(    on_success=async_success_callback,    on_rejected=async_reject_callback)asyncdefasync_operation(task_id):print(f"开始异步 {task_id}")await asyncio.sleep(1)print(f"结束异步 {task_id}")defthread_worker(task_id):print(f"线程 {task_id} 启动")    loop = asyncio.new_event_loop()    asyncio.set_event_loop(loop)    result = loop.run_until_complete(async_operation(task_id))    loop.close()threads = []for i inrange(3):    t = threading.Thread(target=thread_worker, args=(i,))    threads.append(t)    t.start()for t in threads:    t.join()threading.Thread(target=thread_worker, args=(100,)).start()"""线程 0 启动线程 1 启动线程 2 启动开始异步 1线程 0 被拒绝线程 2 被拒绝结束异步 1线程 1 操作成功线程 100 启动开始异步 100结束异步 100线程 100 操作成功"""

业务陷阱(必读!)

常见错误用法

@single_call(timeout=60, reject_result="发送太频繁")defsend_sms(phone_number):print(f"正在给 {phone_number} 发短信")

问题:这是"函数级"锁,所有用户共享!

  • • 张三给 13800000001 发短信 → 锁住了整个 send_sms 函数
  • • 李四给 13900000002 发短信 → 直接被拒绝!

正确做法:参数级锁

使用 single_call 装饰器,基于手机号/用户ID等参数创建独立的锁:

import asyncioimport inspectimport threadingimport timefrom functools import wrapsfrom typing importCallableOptionalAnyimport logginglogging.basicConfig(    level=logging.INFO,format='%(asctime)s - %(levelname)s - %(message)s')defsingle_call(        key_func: Callable[..., str],  # 用于从参数中提取唯一 Key 的函数        timeout: float = 0.0,        on_success: Optional[Callable[..., Any]] = None,        on_rejected: Optional[Callable[..., Any]] = None,        reject_result: Any = None,        cleanup_threshold: int = 1000,  # 触发内存清理的字典长度阈值):"""    基于参数 Key 的函数调用限制装饰器    参数:        key_func: 一个函数,接收与目标函数相同的参数,返回一个唯一的字符串(如手机号、用户ID)        timeout: 同一个 Key 两次允许执行的最小时间间隔(秒)            timeout = 0: 仅限制函数不能同时执行(前一次执行完成后才能开始下一次)            timeout > 0: 即使前一次执行已完成,仍需等待设定的时间间隔后才允许再次执行        on_success: 成功执行后的回调函数        on_rejected: 被拒绝执行时的回调函数        reject_result: 被拒绝时返回的默认值        cleanup_threshold: 状态字典的最大缓存数,超过该值将触发垃圾清理,防止内存泄漏    """defdecorator(func):# 状态字典,格式: { "1380000": {"is_running": False, "last_run_time": 1690000000.0} }        states = {}        lock = threading.Lock()defclean_expired_keys(current_time: float):""" 清理已过期且未运行的 Key,防止内存泄漏"""            keys_to_delete = []for k, state in states.items():ifnot state["is_running"and (current_time - state["last_run_time"] >= timeout):                    keys_to_delete.append(k)for k in keys_to_delete:del states[k]if inspect.iscoroutinefunction(func):            @wraps(func)asyncdefasync_wrapped(*args, **kwargs):# 动态生成本次请求的专属 Keytry:                    call_key = str(key_func(*args, **kwargs))except Exception as e:                    logging.warning(f"Key提取错误,使用默认Key: {e}")                    call_key = "default_key"                current_time = time.time()                should_reject = False# 状态检查与更新with lock:# 定期清理垃圾内存 (字典超过 cleanup_threshold 个元素时触发清理)iflen(states) > cleanup_threshold:                        clean_expired_keys(current_time)                    state = states.get(call_key)if state isNone:                        state = {"is_running"False"last_run_time"0.0}                        states[call_key] = stateif state["is_running"or (current_time - state["last_run_time"] < timeout):                        should_reject = Trueelse:                        state["is_running"] = True# 拒绝逻辑及回调if should_reject:if on_rejected:try:if inspect.iscoroutinefunction(on_rejected):await on_rejected(*args, **kwargs)else:                                on_rejected(*args, **kwargs)except Exception as e:                            logging.error(f"拒绝回调错误: {e}")return reject_result# 核心逻辑及成功回调try:                    result = await func(*args, **kwargs)if on_success:try:if inspect.iscoroutinefunction(on_success):await on_success(*args, **kwargs)else:                                on_success(*args, **kwargs)except Exception as e:                            logging.error(f"成功回调错误: {e}")return resultfinally:# 执行完毕,复位当前 Key 的状态with lock:                        state = states.get(call_key)if state:                            state["is_running"] = False                            state["last_run_time"] = time.time()# 如果 timeout 为 0,说明不需要冷却,用完立刻删除以节省内存if timeout <= 0:del states[call_key]return async_wrappedelse:            @wraps(func)defsync_wrapped(*args, **kwargs):try:                    call_key = str(key_func(*args, **kwargs))except Exception as e:                    logging.warning(f"Key提取错误,使用默认Key: {e}")                    call_key = "default_key"                current_time = time.time()                should_reject = Falsewith lock:iflen(states) > cleanup_threshold:                        clean_expired_keys(current_time)                    state = states.get(call_key)if state isNone:                        state = {"is_running"False"last_run_time"0.0}                        states[call_key] = stateif state["is_running"or (current_time - state["last_run_time"] < timeout):                        should_reject = Trueelse:                        state["is_running"] = Trueif should_reject:if on_rejected:try:if inspect.iscoroutinefunction(on_rejected):raise TypeError("同步函数不允许使用异步的 on_rejected 回调")                            on_rejected(*args, **kwargs)except Exception as e:                            logging.error(f"拒绝回调错误: {e}")return reject_resulttry:                    result = func(*args, **kwargs)if on_success:try:if inspect.iscoroutinefunction(on_success):raise TypeError("同步函数不允许使用异步的 on_success 回调")                            on_success(*args, **kwargs)except Exception as e:                            logging.error(f"成功回调错误: {e}")return resultfinally:with lock:                        state = states.get(call_key)if state:                            state["is_running"] = False                            state["last_run_time"] = time.time()if timeout <= 0:del states[call_key]return sync_wrappedreturn decorator

使用示例

asyncdefsms_success(phone, user_id):print(f"[成功回调] 用户 {user_id}-{phone} 任务成功回调")asyncdefsms_rejected(phone, user_id):print(f"[失败回调] {user_id} 重复提交已拦截。")# key_func 用于提取请求的唯一标识。# 这里的 lambda phone, user_id: phone 的意思是:取第一个参数 phone 作为锁的 Key@single_call(    key_func=lambda q, user_id: q,    timeout=5.0,  # 对同一个手机号,冷却 5 秒    on_success=sms_success,    on_rejected=sms_rejected,    reject_result={"code"429"msg""发送太频繁,请稍后再试"})asyncdefsend_sms(phone, user_id):print(f"[{user_id}] 任务开始...")await asyncio.sleep(1)return {"code"200"msg"f"{user_id} 任务成功"}asyncdeftest():    res1 = asyncio.create_task(send_sms("13800000000", user_id="U_001"))    res2 = asyncio.create_task(send_sms("13800000000", user_id="U_001"))    res3 = asyncio.create_task(send_sms("13800000000", user_id="U_001"))    res4 = asyncio.create_task(send_sms("13999999999", user_id="U_002"))    results = await asyncio.gather(res1, res2, res3, res4)for i, r inenumerate(results):print(f"返回值 {i + 1}{r}")if __name__ == "__main__":    asyncio.run(test())

在真实的 Web 场景中,提交订单、发送短信防并发,通常会放弃 Python 内置锁,改为使用 Redis 分布式锁。

你的项目中有这样的需求吗?

欢迎在评论区分享你的使用场景!

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  1. CONNECT:[ UseTime:0.000576s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000919s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000318s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000283s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000606s ]
  6. SELECT * FROM `set` [ RunTime:0.000223s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000650s ]
  8. SELECT * FROM `article` WHERE `id` = 481825 LIMIT 1 [ RunTime:0.000674s ]
  9. UPDATE `article` SET `lasttime` = 1774588871 WHERE `id` = 481825 [ RunTime:0.007186s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000250s ]
  11. SELECT * FROM `article` WHERE `id` < 481825 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000474s ]
  12. SELECT * FROM `article` WHERE `id` > 481825 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000457s ]
  13. SELECT * FROM `article` WHERE `id` < 481825 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005721s ]
  14. SELECT * FROM `article` WHERE `id` < 481825 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001328s ]
  15. SELECT * FROM `article` WHERE `id` < 481825 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001385s ]
0.091609s