lukasandClaude Opus 4.8
a5ec0d21cb
Three-pane webmail client. - Backend: FastAPI + async SQLAlchemy + arq worker (Postgres/Redis), IMAP/SMTP sync, threading, search, drafts/outbox with undo, attachments, 2FA. - Frontend: React 18 + Vite + TypeScript + TanStack Query + Tailwind; three-pane UI with rich-text composer, light/dark themes, resizable panels. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
73 lines
1.9 KiB
Python
73 lines
1.9 KiB
Python
"""Async SQLAlchemy engine/session management (SPEC §2 ``app/db.py``)."""
|
|
|
|
from __future__ import annotations
|
|
|
|
from collections.abc import AsyncIterator
|
|
from contextlib import asynccontextmanager
|
|
|
|
from sqlalchemy.ext.asyncio import (
|
|
AsyncEngine,
|
|
AsyncSession,
|
|
async_sessionmaker,
|
|
create_async_engine,
|
|
)
|
|
from sqlalchemy.orm import DeclarativeBase
|
|
|
|
from app.config import get_settings
|
|
|
|
_engine: AsyncEngine | None = None
|
|
_sessionmaker: async_sessionmaker[AsyncSession] | None = None
|
|
|
|
|
|
class Base(DeclarativeBase):
|
|
"""Declarative base for all ORM models."""
|
|
|
|
|
|
def get_engine() -> AsyncEngine:
|
|
"""Return (creating on first use) the process-wide async engine."""
|
|
global _engine
|
|
if _engine is None:
|
|
_engine = create_async_engine(
|
|
get_settings().database_url,
|
|
pool_pre_ping=True,
|
|
future=True,
|
|
)
|
|
return _engine
|
|
|
|
|
|
def get_sessionmaker() -> async_sessionmaker[AsyncSession]:
|
|
"""Return the process-wide session factory."""
|
|
global _sessionmaker
|
|
if _sessionmaker is None:
|
|
_sessionmaker = async_sessionmaker(
|
|
get_engine(), expire_on_commit=False, class_=AsyncSession
|
|
)
|
|
return _sessionmaker
|
|
|
|
|
|
@asynccontextmanager
|
|
async def session_scope() -> AsyncIterator[AsyncSession]:
|
|
"""Transactional session context manager for workers and scripts."""
|
|
async with get_sessionmaker()() as session:
|
|
try:
|
|
yield session
|
|
await session.commit()
|
|
except Exception:
|
|
await session.rollback()
|
|
raise
|
|
|
|
|
|
async def get_session() -> AsyncIterator[AsyncSession]:
|
|
"""FastAPI dependency yielding a request-scoped session."""
|
|
async with get_sessionmaker()() as session:
|
|
yield session
|
|
|
|
|
|
async def dispose_engine() -> None:
|
|
"""Dispose the engine (used on app shutdown)."""
|
|
global _engine, _sessionmaker
|
|
if _engine is not None:
|
|
await _engine.dispose()
|
|
_engine = None
|
|
_sessionmaker = None
|