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b2c1c67 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 | """Async SQLAlchemy engine and session management."""
from collections.abc import AsyncGenerator
from pathlib import Path
from sqlalchemy import event
from sqlalchemy.ext.asyncio import (
AsyncSession,
async_sessionmaker,
create_async_engine,
)
from sqlalchemy.orm import DeclarativeBase
from app.config import get_settings
settings = get_settings()
_is_sqlite = settings.database_url.startswith("sqlite")
# Ensure the data directory exists for SQLite
if _is_sqlite:
db_path = settings.database_url.split("///")[-1]
Path(db_path).parent.mkdir(parents=True, exist_ok=True)
engine = create_async_engine(
settings.database_url,
echo=False,
future=True,
# Wait for a competing writer instead of failing instantly. Background
# tasks (such as conversation summarization) can briefly hold a write
# lock, and Windows enforces SQLite locking more strictly than Linux.
connect_args={"timeout": 30} if _is_sqlite else {},
)
if _is_sqlite:
@event.listens_for(engine.sync_engine, "connect")
def _sqlite_pragmas(dbapi_connection, connection_record) -> None:
cursor = dbapi_connection.cursor()
cursor.execute("PRAGMA busy_timeout=30000")
cursor.execute("PRAGMA foreign_keys=ON")
cursor.close()
AsyncSessionLocal = async_sessionmaker(
bind=engine,
class_=AsyncSession,
expire_on_commit=False,
autoflush=False,
)
class Base(DeclarativeBase):
"""Declarative base for all ORM models."""
async def get_db() -> AsyncGenerator[AsyncSession, None]:
"""FastAPI dependency that yields a database session."""
async with AsyncSessionLocal() as session:
yield session
async def init_db() -> None:
"""Create tables on startup (a migration tool can replace this later)."""
from app import models # noqa: F401 (register models with the metadata)
async with engine.begin() as conn:
await conn.run_sync(Base.metadata.create_all)
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