Vladless
48 lines
1.1 KiB
Python
48 lines
1.1 KiB
Python
import asyncio
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from sqlalchemy import text
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from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
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from sqlalchemy.orm import declarative_base
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from config import DATABASE_URL, DB_MAX_OVERFLOW, DB_POOL_SIZE
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CONCURRENT_UPDATES_LIMIT = DB_POOL_SIZE + DB_MAX_OVERFLOW
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MAX_UPDATE_AGE_SEC = 15
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engine = create_async_engine(
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DATABASE_URL,
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echo=False,
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future=True,
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pool_size=DB_POOL_SIZE,
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max_overflow=DB_MAX_OVERFLOW,
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pool_timeout=60,
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pool_pre_ping=True,
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pool_recycle=300,
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)
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async_session_maker = async_sessionmaker(
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bind=engine,
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expire_on_commit=False,
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class_=AsyncSession,
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)
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Base = declarative_base()
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WARM_POOL_COUNT = 10
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async def warm_pool() -> None:
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"""
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Прогревает пул соединений при старте.
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"""
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async def _one() -> None:
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async with async_session_maker() as session:
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await session.execute(text("SELECT 1"))
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count = min(WARM_POOL_COUNT, DB_POOL_SIZE)
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if count <= 0:
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return
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await asyncio.gather(*[asyncio.create_task(_one()) for _ in range(count)])
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