Недавно делал быстрый прототип асинхронного приложения в котором требовалось вызывать много синхронного кода. Да, я знаю, что это не лучший дизайн, но нужно было быстрое решение на один процесс и без очередей. Поэтому я выполнял код в потоках.
Выглядело это примерно так:
from fastapi.concurrency import run_in_threadpool
async def execute(data: DataRequest) -> DataResponse:
try:
result = await run_in_threadpool(sync_function, data)
return DataResponse(data=result)
except Exception as e:
return DataResponse(
error=str(e),
success=False,
)
В общем работает нормально. Для всех вызовов под капотом используется общий тредпул, всё работает предсказуемо.
Но потребовалось изменить количество запускаемых в пуле потоков (по умолчанию создается 40 воркеров).
Так как дело происходит с FastAPI, делается это через lifespan используя настройки anyio:
import anyio
@asynccontextmanager
async def lifespan(app: FastAPI):
limiter = anyio.to_thread.current_default_thread_limiter()
limiter.total_tokens = 100
yield
# если вдруг нужно вернуть обратно
limiter.total_tokens = 40
Зачем менять количество воркеров?
- уменьшить, если оперативки мало (один тред занимает ~8мб)
- увеличить чтобы выдержать нагрузку
Если есть предложения получше при тех же вводных - предлагайте😉
#async
Bot API 7.0
Announcing our biggest Bot API update yet!
Reactions
• Introducing full reaction support for bots.
• Bots can now react to messages with setMessageReaction.
• Message reactions now generate updates for bots.
• Added the available_reactions field to the class Chat.
Replies 2.0
• Bots can now reply to messages in other chats or topics.
• Added the ExternalReplyInfo class, to track replies across chats.
• The new class ReplyParameters replaces individual reply options in all relevant methods and lets bots quote parts of any message.
• The new field quote of the class Message lets bots detect incoming quoted text.
Link Preview Customization
• Bots can now set a custom URL to generate link previews in outgoing messages.
• Added support for custom size and position of link previews.
• Added the class LinkPreviewOptions to support these new options.
Batch Actions
• Bots can now delete multiple messages in a single request via deleteMessages.
• Bots can now forward or copy multiple messages in a single request via the respective forwardMessages and copyMessages methods.
Boosts & Giveaways
• Added support for Giveaway messages, allowing bots to detect their creation and completion.
• Added updates about chat boost changes via the new classes ChatBoostUpdated and ChatBoostRemoved.
• Bots can now see if a boost came from a premium sub, a gift code, or a giveaway, as well as check all active user boosts via getUserChatBoosts.
General
•Blockquotes are now supported in MarkdownV2 and HTML parse modes.
• Web Apps won't close when calling openTelegramLink.
• Web Apps can now toggle the visibility and on-click behavior of the Settings Button.
• Bots can now request multiple users, see KeyboardButtonRequestUsers.
• The class Chat has new fields holding profile and background colors, custom emoji, and more.
• And a great deal more. See the full changelog for details:
https://core.telegram.org/bots/api-changelog#december-29-2023
Happy Holidays from the Telegram Team 🎆
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