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https://github.com/jxxghp/MoviePilot.git
synced 2026-02-13 23:45:05 +08:00
feat(rate-limiter): add rate limiter
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@@ -6,9 +6,26 @@ class ImmediateException(Exception):
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pass
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class APIRateLimitException(ImmediateException):
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class LimitException(ImmediateException):
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"""
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用于表示本地限流器或外部触发的限流异常的基类。
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该异常类可用于本地限流逻辑或外部限流处理。
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"""
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pass
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class APIRateLimitException(LimitException):
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"""
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用于表示API速率限制的异常类。
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当API调用触发速率限制时,可以抛出此异常以立即终止操作并报告错误。
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"""
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pass
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class RateLimitExceededException(LimitException):
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"""
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用于表示本地限流器触发的异常类。
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当函数调用频率超过限流器的限制时,可以抛出此异常以停止当前操作并告知调用者限流情况。
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这个异常通常用于本地限流逻辑(例如 RateLimiter),当系统检测到函数调用频率过高时,触发限流并抛出该异常。
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"""
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pass
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@@ -1,7 +1,10 @@
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import functools
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import threading
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import time
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from typing import Any
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from typing import Any, Callable, Optional
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from app.schemas import ImmediateException
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from app.log import logger
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from app.schemas import ImmediateException, APIRateLimitException, RateLimitExceededException
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def retry(ExceptionToCheck: Any,
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@@ -36,3 +39,94 @@ def retry(ExceptionToCheck: Any,
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return f_retry
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return deco_retry
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class RateLimiter:
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"""
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限流器类,用于处理调用的限流逻辑
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通过增加等待时间逐步减少调用的频率,以避免触发限流
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"""
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def __init__(self, base_wait: int = 60, max_wait: int = 600, backoff_factor: int = 1):
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"""
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初始化 RateLimiter 实例
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:param base_wait: 基础等待时间(秒),默认值为 60 秒(1 分钟)
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:param max_wait: 最大等待时间(秒),默认值为 600 秒(10 分钟)
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:param backoff_factor: 等待时间的递增倍数,默认值为 1
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"""
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self.next_allowed_time = 0
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self.current_wait = base_wait
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self.base_wait = base_wait
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self.max_wait = max_wait
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self.backoff_factor = backoff_factor
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self.lock = threading.Lock()
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def can_call(self) -> bool:
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"""
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检查是否可以进行下一次调用
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:return: 如果当前时间超过下一次允许调用的时间,返回 True;否则返回 False
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"""
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current_time = time.time()
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with self.lock:
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if current_time >= self.next_allowed_time:
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return True
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logger.warn(f"限流期间,跳过调用:将在 {self.next_allowed_time - current_time:.2f} 秒后允许继续调用")
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return False
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def reset(self):
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"""
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重置等待时间
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当调用成功时调用此方法,重置当前等待时间为基础等待时间
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"""
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with self.lock:
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if self.next_allowed_time != 0 or self.current_wait > self.base_wait:
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logger.info(f"调用成功,重置限流等待时长,并允许立即调用")
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self.next_allowed_time = 0
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self.current_wait = self.base_wait
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def trigger_limit(self):
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"""
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触发限流
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当触发限流异常时调用此方法,增加下一次允许调用的时间并更新当前等待时间
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"""
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current_time = time.time()
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with self.lock:
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self.next_allowed_time = current_time + self.current_wait
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logger.warn(f"触发限流:将在 {self.current_wait} 秒后允许继续调用")
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self.current_wait = min(self.current_wait * self.backoff_factor, self.max_wait)
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def rate_limit_handler(base_wait: int = 60, max_wait: int = 600, backoff_factor: int = 1,
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raise_on_limit: bool = True) -> Callable:
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"""
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装饰器,用于处理限流逻辑
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:param base_wait: 基础等待时间(秒),默认值为 60 秒(1 分钟)
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:param max_wait: 最大等待时间(秒),默认值为 600 秒(10 分钟)
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:param backoff_factor: 等待时间的递增倍数,默认值为 1
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:param raise_on_limit: 是否在触发限流异常时抛出异常,默认为 True
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:return: 装饰器函数
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"""
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rate_limiter = RateLimiter(base_wait, max_wait, backoff_factor)
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def decorator(func: Callable) -> Callable:
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@functools.wraps(func)
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def wrapper(*args, **kwargs) -> Optional[Any]:
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if not rate_limiter.can_call():
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if raise_on_limit:
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raise RateLimitExceededException("调用因限流被跳过")
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return None
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try:
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result = func(*args, **kwargs)
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rate_limiter.reset() # 调用成功,重置等待时间
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return result
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except APIRateLimitException as e:
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rate_limiter.trigger_limit()
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logger.error(f"触发限流:{str(e)}")
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if raise_on_limit:
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raise e
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return None
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return wrapper
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return decorator
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