43 lines
975 B
Python
43 lines
975 B
Python
"""Async database engine and session factory."""
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from sqlalchemy.ext.asyncio import (
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AsyncSession,
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async_sessionmaker,
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create_async_engine,
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)
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from sqlalchemy.orm import DeclarativeBase
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from app.config import settings
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engine = create_async_engine(
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settings.DATABASE_URL,
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echo=settings.DEBUG,
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pool_size=10,
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max_overflow=20,
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)
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async_session_factory = async_sessionmaker(
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engine,
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class_=AsyncSession,
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expire_on_commit=False,
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)
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class Base(DeclarativeBase):
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pass
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async def get_db() -> AsyncSession:
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"""Dependency that yields an async database session.
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Handlers are responsible for committing or rolling back their own
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transactions. This avoids the double-commit problem where the
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session is committed both here and in the handler.
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"""
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async with async_session_factory() as session:
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try:
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yield session
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except Exception:
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await session.rollback()
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raise
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