database.py

import os
from typing import AsyncGenerator
from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine
from sqlalchemy.orm import sessionmaker, declarative_base
from sqlalchemy.pool import NullPool
from dotenv import load_dotenv

load_dotenv()

DATABASE_URL = os.getenv(
    "DATABASE_URL",
    "postgresql+asyncpg://postgres:postgres@postgres:5432/infog2_db"
)

engine = create_async_engine(
    DATABASE_URL,
    echo=True,
    future=True,
    poolclass=NullPool,
    pool_pre_ping=True,
)

AsyncSessionLocal = sessionmaker(
    engine,
    class_=AsyncSession,
    expire_on_commit=False,
    autocommit=False,
    autoflush=False,
)

Base = declarative_base()

async def get_db() -> AsyncGenerator[AsyncSession, None]:
    async with AsyncSessionLocal() as session:
        try:
            yield session
            await session.commit()
        except Exception:
            await session.rollback()
            raise
        finally:
            await session.close()