54 lines
1.4 KiB
Python
54 lines
1.4 KiB
Python
from collections.abc import AsyncIterator
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from sqlalchemy.ext.asyncio import (
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AsyncEngine,
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AsyncSession,
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async_sessionmaker,
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create_async_engine,
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)
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from .settings import get_settings
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_engine: AsyncEngine | None = None
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_sessionmaker: async_sessionmaker[AsyncSession] | 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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s = get_settings()
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# PH-016: explicit pool sizing. pool_pre_ping protects against stale
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# connections after PG restarts; pool_recycle bounds connection age.
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_engine = create_async_engine(
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s.database_url,
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pool_pre_ping=True,
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pool_size=s.db_pool_size,
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max_overflow=s.db_max_overflow,
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pool_timeout=s.db_pool_timeout_sec,
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pool_recycle=s.db_pool_recycle_sec,
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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[AsyncSession]:
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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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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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async def get_session() -> AsyncIterator[AsyncSession]:
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sm = get_sessionmaker()
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async with sm() as session:
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yield session
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