externals/databases/database.py

import os
import dotenv

from config.constant import EnvPostgresConstants, EnvFilepath
dotenv.load_dotenv(EnvFilepath.ENVPATH)

from contextlib import asynccontextmanager
from sqlalchemy.ext.asyncio import create_async_engine, async_sessionmaker, AsyncSession
from sqlalchemy.orm import declarative_base

DATABASE_URL = EnvPostgresConstants.CONSTRING.\
    replace("postgresql+psycopg2", "postgresql+asyncpg")

engine = create_async_engine(
    DATABASE_URL,
    echo=False,
    future=True
)

AsyncSessionLocal = async_sessionmaker(
    engine, 
    expire_on_commit=False, 
    class_=AsyncSession
)

Base = declarative_base()

# async def get_db():
#     async with AsyncSessionLocal() as session:
#         try:
#             return session
#         finally:
#             await session.close()

async def get_db():
    async with AsyncSessionLocal() as session:
        try:
            yield session
        finally:
            await session.close()

# async def get_db_session():
#     session = AsyncSessionLocal()
#     try:
#         return session
#     except:
#         await session.close()
#         raise


@asynccontextmanager
async def db_session():
    async with AsyncSessionLocal() as session:
        try:
            yield session
        finally:
            await session.close()