36 lines
1.2 KiB
Python
36 lines
1.2 KiB
Python
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"""Подключение к Postgres. Асинхронный движок, одна фабрика сессий на процесс."""
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from collections.abc import AsyncIterator
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from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
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from sqlalchemy.orm import DeclarativeBase
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from app.config import get_settings
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class Base(DeclarativeBase):
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"""Общая база моделей. Alembic сравнивает миграции с `Base.metadata`."""
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_engine = None
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_sessionmaker: async_sessionmaker[AsyncSession] | None = None
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def get_engine():
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global _engine
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if _engine is None:
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_engine = create_async_engine(get_settings().database_url, pool_pre_ping=True)
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return _engine
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def get_sessionmaker() -> async_sessionmaker[AsyncSession]:
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global _sessionmaker
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if _sessionmaker is None:
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_sessionmaker = async_sessionmaker(get_engine(), expire_on_commit=False)
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return _sessionmaker
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async def get_session() -> AsyncIterator[AsyncSession]:
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"""Зависимость FastAPI: сессия на запрос, коммит явный."""
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async with get_sessionmaker()() as session:
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yield session
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