Vladless
75 lines
2.9 KiB
Python
75 lines
2.9 KiB
Python
import asyncio
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import time
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from collections.abc import Awaitable, Callable
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from typing import Any
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from aiogram import BaseMiddleware, Bot
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from aiogram.types import CallbackQuery, Message, TelegramObject
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from core.cache_config import CONCURRENCY_REJECT_NOTICE_TTL_SEC
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from core.redis_cache import cache_key, cache_setnx
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from database.db import CONCURRENT_UPDATES_LIMIT, MAX_UPDATE_AGE_SEC
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class ConcurrencyLimiterMiddleware(BaseMiddleware):
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"""
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Регистрируется до SessionMiddleware. Ограничивает число апдейтов, одновременно
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получающих сессию, и отсекает апдейты, ждавшие слишком долго.
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"""
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def __init__(self) -> None:
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self._semaphore = asyncio.Semaphore(CONCURRENT_UPDATES_LIMIT)
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self._notice_ttl = CONCURRENCY_REJECT_NOTICE_TTL_SEC
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async def __call__(
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self,
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handler: Callable[[TelegramObject, dict[str, Any]], Awaitable[Any]],
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event: TelegramObject,
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data: dict[str, Any],
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) -> Any:
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data["request_time"] = time.monotonic()
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await self._semaphore.acquire()
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try:
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age = time.monotonic() - data["request_time"]
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if age > MAX_UPDATE_AGE_SEC:
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await self._reject_stale(event, data)
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return None
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return await handler(event, data)
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finally:
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self._semaphore.release()
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async def _reject_stale(self, event: TelegramObject, data: dict[str, Any]) -> None:
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if isinstance(event, CallbackQuery):
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bot: Bot = data.get("bot")
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uid = event.from_user.id if event.from_user else None
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should_notify = (
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bot
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and uid is not None
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and await cache_setnx(cache_key("concurrency_notice", uid), 1, self._notice_ttl)
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)
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if should_notify:
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try:
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await bot.answer_callback_query(
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event.id,
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text="Время ожидания истекло. Нажмите ещё раз.",
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show_alert=False,
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)
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except Exception:
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pass
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elif isinstance(event, Message) and event.text and event.chat:
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bot: Bot = data.get("bot")
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uid = event.from_user.id if event.from_user else None
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should_notify = (
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bot
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and uid is not None
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and await cache_setnx(cache_key("concurrency_notice", uid), 1, self._notice_ttl)
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)
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if should_notify:
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try:
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await bot.send_message(
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event.chat.id,
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"Сейчас высокая нагрузка. Отправьте команду ещё раз через пару секунд.",
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)
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except Exception:
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pass
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