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- 搭建 FastAPI、Redis、PostgreSQL、Nginx 与 Docker Compose 基础结构 - 实现反向代理、首用绑定、拦截告警、归档任务和管理接口 - 提供 Vue3 管理后台初版，以及 uv/requirements 双依赖配置
49 lines
1.2 KiB
Python
49 lines
1.2 KiB
Python
from __future__ import annotations
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from sqlalchemy.ext.asyncio import AsyncEngine, AsyncSession, async_sessionmaker, create_async_engine
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from sqlalchemy.orm import DeclarativeBase
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from app.config import Settings
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class Base(DeclarativeBase):
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pass
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_engine: AsyncEngine | None = None
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_session_factory: async_sessionmaker[AsyncSession] | None = None
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def init_db(settings: Settings) -> None:
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global _engine, _session_factory
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if _engine is not None and _session_factory is not None:
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return
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_engine = create_async_engine(
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settings.pg_dsn,
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pool_pre_ping=True,
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pool_size=20,
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max_overflow=40,
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)
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_session_factory = async_sessionmaker(_engine, expire_on_commit=False)
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def get_engine() -> AsyncEngine:
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if _engine is None:
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raise RuntimeError("Database engine has not been initialized.")
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return _engine
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def get_session_factory() -> async_sessionmaker[AsyncSession]:
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if _session_factory is None:
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raise RuntimeError("Database session factory has not been initialized.")
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return _session_factory
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async def close_db() -> None:
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global _engine, _session_factory
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if _engine is not None:
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await _engine.dispose()
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_engine = None
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_session_factory = None
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