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from __future__ import annotations
from typing import TYPE_CHECKING, Any, Callable
from aiogram import BaseMiddleware
from cachetools import TTLCache
from bot.core.config import settings
if TYPE_CHECKING:
from collections.abc import Awaitable
from aiogram.types import Chat, TelegramObject
class ThrottlingMiddleware(BaseMiddleware):
cache: TTLCache[int, Any]
def __init__(self, rate_limit: float = settings.RATE_LIMIT) -> None:
self.cache = TTLCache(maxsize=10_000, ttl=rate_limit)
async def __call__(
self,
handler: Callable[[TelegramObject, dict[str, Any]], Awaitable[Any]],
event: TelegramObject,
data: dict[str, Any],
) -> Any:
chat: Chat | None = getattr(event, "chat", None)
if not chat:
return await handler(event, data)
if chat.id in self.cache:
return None
self.cache[chat.id] = None
return await handler(event, data)
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