90 lines
2.4 KiB
Python
90 lines
2.4 KiB
Python
"""SQLAlchemy 异步引擎与会话。"""
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from typing import Any
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from sqlalchemy.ext.asyncio import (
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AsyncSession,
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AsyncEngine,
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async_sessionmaker,
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create_async_engine,
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)
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from sqlalchemy.orm import DeclarativeBase
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from app.config import settings
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def _build_engine() -> AsyncEngine:
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return create_async_engine(
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settings.database_url,
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echo=settings.debug,
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future=True,
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)
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def _build_session_maker(bind_engine: AsyncEngine) -> async_sessionmaker[AsyncSession]:
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return async_sessionmaker(
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bind_engine,
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class_=AsyncSession,
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expire_on_commit=False,
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autocommit=False,
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autoflush=False,
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)
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class _AsyncSessionMakerProxy:
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"""可重绑定的 sessionmaker 代理。
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Celery prefork 模式下，worker 子进程不能继续复用父进程里初始化的
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async engine / sessionmaker。这里保持导入对象稳定，同时允许在子进程
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启动后重新绑定底层 sessionmaker。
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"""
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def __init__(self, maker: async_sessionmaker[AsyncSession]) -> None:
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self._maker = maker
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def configure(self, maker: async_sessionmaker[AsyncSession]) -> None:
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self._maker = maker
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def __call__(self, *args: Any, **kwargs: Any) -> AsyncSession:
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return self._maker(*args, **kwargs)
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engine = _build_engine()
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async_session_maker = _AsyncSessionMakerProxy(_build_session_maker(engine))
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class Base(DeclarativeBase):
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"""所有 ORM 模型的基类。"""
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pass
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async def init_db() -> None:
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"""创建所有表（开发/迁移用）。"""
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# 确保 ORM 模型已导入，从而注册到 Base.metadata
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import app.models.llm # noqa: F401 # pylint: disable=unused-import
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import app.models.studio # noqa: F401
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import app.models.task # noqa: F401
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import app.models.task_links # noqa: F401
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async with engine.begin() as conn:
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await conn.run_sync(Base.metadata.create_all)
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async def close_db() -> None:
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"""关闭数据库连接。"""
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await engine.dispose()
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def reset_db_runtime() -> None:
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"""在 Celery worker 子进程中重建 engine 与 sessionmaker。
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这样可以避免 prefork 继承父进程中的 async engine，导致连接对象和事件循环
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绑定错乱，触发 Future attached to a different loop。
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"""
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global engine
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engine = _build_engine()
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async_session_maker.configure(_build_session_maker(engine))
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