redis锁防止重复提交

可以使用Redis的分布式锁来防止重复提交。下面是一个基本的示例代码：

import redis
import time

# 创建Redis连接
redis_client = redis.Redis(host='localhost', port=6379, db=0)

def acquire_lock(lock_name, acquire_timeout=10, lock_timeout=10):
    # 生成唯一的锁标识符
    identifier = str(time.time())

    end_time = time.time() + acquire_timeout
    while time.time() < end_time:
        # 尝试获取锁
        if redis_client.setnx(lock_name, identifier):
            # 设置锁的超时时间，避免死锁
            redis_client.expire(lock_name, lock_timeout)
            return identifier

        time.sleep(0.001)  # 等待一段时间后重试

    return None

def release_lock(lock_name, identifier):
    with redis_client.pipeline() as pipe:
        while True:
            try:
                # 监视锁，确保在删除之前没有其他线程修改了它
                pipe.watch(lock_name)
                if pipe.get(lock_name).decode() == identifier:
                    # 释放锁
                    pipe.multi()
                    pipe.delete(lock_name)
                    pipe.execute()
                    return True

                # 其他线程修改了锁，取消监视并重试
                pipe.unwatch()
                break

            except redis.exceptions.WatchError:
                # 锁被修改，重试
                pass

    return False

# 使用锁来执行防止重复提交的逻辑
def process_submission(submission_id):
    lock_name = f"lock:submission:{submission_id}"

    # 尝试获取锁
    identifier = acquire_lock(lock_name)
    if identifier:
        try:
            # 执行提交逻辑
            print(f"Processing submission ID {submission_id}")
            time.sleep(5)  # 模拟处理过程
            print(f"Submission ID {submission_id} processed successfully")