fastapi-sqlalchemy-asyncpg/app/database.py

from collections.abc import AsyncGenerator

from rotoger import AppStructLogger
from sqlalchemy.ext.asyncio import async_sessionmaker, create_async_engine
from sqlalchemy.exc import SQLAlchemyError
from app.config import settings as global_settings

logger = AppStructLogger().get_logger()

engine = create_async_engine(
    global_settings.asyncpg_url.unicode_string(),
    future=True,
    echo=True,
)

# expire_on_commit=False will prevent attributes from being expired
# after commit.
AsyncSessionFactory = async_sessionmaker(
    engine,
    autoflush=False,
    expire_on_commit=False,
)


# Dependency
async def get_db() -> AsyncGenerator:
    async with AsyncSessionFactory() as session:
        # logger.debug(f"ASYNC Pool: {engine.pool.status()}")
        try:
            yield session
            await session.commit()
        except Exception as ex:
            if isinstance(ex, SQLAlchemyError):
                # Re-raise SQLAlchemyError directly without handling
                raise
            else:
                # Handle other exceptions
                await logger.aerror(f"NonSQLAlchemyError: {repr(ex)}")
                raise  # Re-raise after logging