50 lines
1.2 KiB
Python
50 lines
1.2 KiB
Python
"""Database dependencies for FastAPI."""
|
|
|
|
from typing import Generator
|
|
|
|
from sqlalchemy import create_engine
|
|
from sqlalchemy.orm import Session, sessionmaker
|
|
|
|
from ont_platform.config import load_settings
|
|
|
|
# Initialize database engine (lazy singleton)
|
|
_engine = None
|
|
_SessionLocal = None
|
|
|
|
|
|
def get_db_engine():
|
|
"""Get or create database engine."""
|
|
global _engine
|
|
if _engine is None:
|
|
settings = load_settings()
|
|
database_url = settings.database_url
|
|
_engine = create_engine(
|
|
database_url,
|
|
connect_args={"timeout": 30} if "sqlite" in database_url else {},
|
|
pool_pre_ping=True,
|
|
echo=False,
|
|
)
|
|
return _engine
|
|
|
|
|
|
def get_session_factory():
|
|
"""Get or create session factory."""
|
|
global _SessionLocal
|
|
if _SessionLocal is None:
|
|
engine = get_db_engine()
|
|
_SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
|
|
return _SessionLocal
|
|
|
|
|
|
def get_db() -> Generator[Session, None, None]:
|
|
"""FastAPI dependency for database session."""
|
|
SessionLocal = get_session_factory()
|
|
db = SessionLocal()
|
|
try:
|
|
yield db
|
|
finally:
|
|
db.close()
|
|
|
|
|
|
__all__ = ["get_db", "get_db_engine", "get_session_factory"]
|