53 lines
1.4 KiB
Python
53 lines
1.4 KiB
Python
"""Process-wide singleton async engine + session helper.
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Previously every API blueprint lazily built its own engine via make_engine(),
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so the process ran N connection pools. This module owns ONE engine for the
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whole app; create_app() disposes it on shutdown via after_serving.
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"""
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from contextlib import asynccontextmanager
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from sqlalchemy.ext.asyncio import (
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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 .config import get_config
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_engine: AsyncEngine | None = None
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_sessionmaker: async_sessionmaker | None = None
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def get_engine() -> AsyncEngine:
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global _engine, _sessionmaker
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if _engine is None:
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_engine = create_async_engine(
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get_config().database_url, pool_pre_ping=True, future=True
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)
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_sessionmaker = async_sessionmaker(_engine, expire_on_commit=False)
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return _engine
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def _get_sessionmaker() -> async_sessionmaker:
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if _sessionmaker is None:
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get_engine()
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assert _sessionmaker is not None
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return _sessionmaker
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@asynccontextmanager
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async def get_session():
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"""`async with get_session() as session:` — one shared pool."""
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Session = _get_sessionmaker()
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async with Session() as session:
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yield session
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async def dispose_engine() -> None:
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global _engine, _sessionmaker
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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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_sessionmaker = None
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