限制函数在规定时间内只能执行一次

import time
from datetime import datetime
from datetime import timedelta


def timeguard(time_interval, default=None):
    def decorator(function):
        # For first time always run the function
        function.__last_run = datetime.min
        def guard(*args, **kwargs):
            now = datetime.now()
            if now - function.__last_run >= time_interval:
                function.__last_run = now
                return function(*args, **kwargs)
            elif default is not None:
                return default(*args, **kwargs)
        return guard
    return decorator


if __name__ == "__main__":
    
    @timeguard(timedelta(seconds=4),None)
    def add():
        print 12

    add()
    add()
    add()

记录一下，听常用的功能

def timeguard(time_interval, default=None):
    def decorator(function):
        # For first time always run the function
        function.__last_run = datetime.min
        def guard(*args, **kwargs):
            now = datetime.now()
            if now - function.__last_run >= time_interval:
                function.__last_run = now
                return function(*args, **kwargs)
            elif default is not None:
                return default(*args, **kwargs)
        return guard
    return decorator
@timeguard(timedelta(seconds=6),None)
def send_kafka_info(output_image_frame,alarm_content):

    bootstrap_servers = ['172.18.43.131:9092']
    topic = 'alg_recognition'
    
   
    # 上传minio
    # 发送kafka消息
    # 年月日分时秒的时间
    now_time = datetime.now().strftime('%Y-%m-%d %H:%M:%S')
    # 年月日时间
    data_time = now_time[0:10]
    kafka_info = {
        "businessCode": "zjk-env-sqgdj",
        "businessName": "张家口",
        "deviceNo": "show_room_person_count",
        "deviceName": "人员计数-展厅摄像头",
        "alarmType": "人员计数",
        "alarmTime": now_time,
        "alarmDate": data_time,
        "algCode": "ce202111180100007-zjk-env-sqgdj",
        "sourceImgUrl": "",
        "handleImgUrl": "",
        "videoUrl": "",
        "channel": "",
        "alarmContent": "",
        "algImageCode": "ce202111180100007",
        "trig": "周期检测优先"
    }

   

    
    try:
        # 写入图片
        img_path = os.path.join(os.path.dirname(os.path.abspath(__file__)),"test_img",uuid.uuid4().hex + ".jpg")
        cv2.imwrite(img_path,output_image_frame)
        # 上传minio
        pic_url = save_picture_and_get_url_gevent(img_path)
        kafka_info['sourceImgUrl'] = pic_url
        kafka_info['handleImgUrl'] = pic_url
        kafka_info['alarmContent'] = alarm_content
        print({"msg": "通过kafka发送消息", "kafka_info": kafka_info})
        """
        {'msg': '通过kafka发送消息', 'kafka_info': {'businessCode': 'zjk-env-sqgdj', 'businessName': '张家口', 'deviceNo': 'show_room_person_count', 'deviceName': '人员计数-展厅摄像头', 'alarmType': '人员计数', 'alarmTime': '2023-07-07 11:34:21', 'alarmDate': '2023-07-07', 'algCode': 'ce202111180100007-zjk-env-sqgdj', 'sourceImgUrl': 'http://106.112.143.254:8333/bigscreen/alg_recognition/9c646c488d434b12bbe03f62967fb444.jpg', 'handleImgUrl': 'http://106.112.143.254:8333/bigscreen/alg_recognition/9c646c488d434b12bbe03f62967fb444.jpg', 'videoUrl': '', 'channel': '', 'alarmContent': '上行:0,下行:0', 'algImageCode': 'ce202111180100007', 'trig': '周期检测优先'}}
        """
        producer = KafkaProducer(bootstrap_servers=bootstrap_servers)
        future = producer.send(topic, key=None, value=json.dumps(kafka_info, ensure_ascii=False).encode())
        #  kafka 10秒钟发不出去，就太过分了
        result = future.get(timeout=10)
        print("{} kafka res:".format(datetime.now()), result)
    except:
        print(datetime.now().strftime("%Y-%m-%f %H:%M:%s"), traceback.format_exc())

这样别人在调用kafka的时候，会限制频次。