请写一段代码实现计时攻击

以下是一个示例实现计时攻击的代码：

import time

MAX_LOGIN_ATTEMPTS = 3
MIN_LOGIN_INTERVAL = 5  # seconds
BAN_TIME = 60  # seconds

def login(username, password):
    if is_banned(username):
        print("Error: Your account is currently banned.")
        return False
    if check_password(username, password):
        print("Login successful.")
        reset_login_attempts(username)
        return True
    else:
        print("Error: Incorrect password.")
        increment_login_attempts(username)
        if get_login_attempts(username) >= MAX_LOGIN_ATTEMPTS:
            print(f"Warning: Your account will be banned for {BAN_TIME} seconds due to too many failed login attempts.")
            set_banned_until(username, time.time() + BAN_TIME)
        return False

def is_banned(username):
    banned_until = get_banned_until(username)
    if banned_until is None:
        return False
    elif time.time() < banned_until:
        return True
    else:
        clear_banned_until(username)
        return False

def increment_login_attempts(username):
    current_attempts = get_login_attempts(username)
    set_login_attempts(username, current_attempts + 1)
    set_last_login_attempt(username, time.time())

def reset_login_attempts(username):
    set_login_attempts(username, 0)

def get_login_attempts(username):
    # TODO: Implement database or caching mechanism to store login attempts
    return 0

def set_login_attempts(username, attempts):
    # TODO: Implement database or caching mechanism to store login attempts
    pass

def get_last_login_attempt(username):
    # TODO: Implement database or caching mechanism to store last login attempt time
    return 0

def set_last_login_attempt(username, time):
    # TODO: Implement database or caching mechanism to store last login attempt time
    pass

def get_banned_until(username):
    # TODO: Implement database or caching mechanism to store ban status and time
    return None

def set_banned_until(username, banned_until):
    # TODO: Implement database or caching mechanism to store ban status and time
    pass

def clear_banned_until(username):
    # TODO: Implement database or caching mechanism to clear ban status and time
    pass

这段代码使用了一个基本的机制来实现计时攻击防护。如果用户输入错误的密码，将增加登录尝试次数，并记录尝试的时间。如果尝试次数超过了设定的最大值，用户的帐户将被禁止在一定的时间内登录。帐户禁止解禁后将自动恢复。此外，代码还考虑了一些诸如使用数据库或缓存以存储登录尝试和禁止状态等的实现细节。