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import contextlib
from collections.abc import AsyncIterator
from sqlalchemy.ext.asyncio import (
AsyncConnection,
AsyncSession,
async_sessionmaker,
create_async_engine,
)
from sqlalchemy.orm import declarative_base
from app.core.config import settings
Base = declarative_base()
# Inspiration https://praciano.com.br/fastapi-and-async-sqlalchemy-20-with-pytest-done-right.html
class DatabaseSessionManager:
def __init__(self):
self._engine = create_async_engine(settings.SQLALCHEMY_DATABASE_URI)
self._sessionmaker = async_sessionmaker(autocommit=False, bind=self._engine)
async def close(self):
if self._engine is None:
raise Exception("DatabaseSessionManager is not initialized")
await self._engine.dispose()
self._engine = None
self._sessionmaker = None
@contextlib.asynccontextmanager
async def connect(self) -> AsyncIterator[AsyncConnection]:
if self._engine is None:
raise Exception("DatabaseSessionManager is not initialized")
async with self._engine.begin() as connection:
try:
yield connection
except Exception:
await connection.rollback()
raise
@contextlib.asynccontextmanager
async def session(self) -> AsyncIterator[AsyncSession]:
if self._sessionmaker is None:
raise Exception("DatabaseSessionManager is not initialized")
session = self._sessionmaker()
try:
yield session
except Exception:
await session.rollback()
raise
finally:
await session.close()
sessionmanager = DatabaseSessionManager()
async def get_db_session():
async with sessionmanager.session() as session:
yield session
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