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from sqlalchemy.ext.asyncio import create_async_engine, AsyncSession, async_sessionmaker
from sqlalchemy.orm import declarative_base
from ..core.config import settings
from sqlalchemy import text
import contextlib
# Create async engine
async_engine = create_async_engine(
settings.DATABASE_URL,
echo=True,
future=True,
pool_pre_ping=True
)
# Create async session factory
async_session_maker = async_sessionmaker(
bind=async_engine,
class_=AsyncSession,
expire_on_commit=False
)
# Declarative base for models
Base = declarative_base()
# FastAPI dependency for DB access
async def get_db():
async with async_session_maker() as session:
try:
yield session
finally:
await session.close()
# Verify DB connection
async def verify_connection():
async with async_session_maker() as session:
try:
await session.execute(text("SELECT 1"))
except Exception as e:
raise ConnectionError(f"Database connection verification failed: {str(e)}")
# Init DB (called during app startup)
async def init_db():
await verify_connection()
# Optional: Custom DB access class
class Database:
def __init__(self):
self._session_factory = async_session_maker
@contextlib.asynccontextmanager
async def session(self):
session = self._session_factory()
try:
yield session
await session.commit()
except:
await session.rollback()
raise
finally:
await session.close()
async def get_session(self):
return self._session_factory()
# Singleton DB instance
db = Database()
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