rayhpeng
77 lines
2.1 KiB
Python
77 lines
2.1 KiB
Python
from __future__ import annotations
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import json
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from sqlalchemy import URL
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from sqlalchemy.engine import make_url
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from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
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from store.persistence import MappedBase
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from store.persistence.shared import close_in_order
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from store.persistence.types import AppPersistence
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def _validate_mysql_driver(db_url: URL) -> str:
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url = make_url(db_url)
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driver = url.get_driver_name()
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if driver not in {"aiomysql", "asyncmy"}:
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raise ValueError(f"MySQL persistence requires async SQLAlchemy driver (aiomysql/asyncmy), got: {driver!r}")
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return driver
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def _checkpoint_conn_string(db_url: URL) -> str:
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return db_url.render_as_string(hide_password=False)
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async def build_mysql_persistence(db_url: URL, *, echo: bool = False, pool_size: int = 5) -> AppPersistence:
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_validate_mysql_driver(db_url)
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from langgraph.checkpoint.mysql.aio import AIOMySQLSaver
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import store.repositories.models # noqa: F401
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engine = create_async_engine(
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db_url,
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echo=echo,
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future=True,
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pool_pre_ping=True,
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pool_size=pool_size,
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json_serializer=lambda obj: json.dumps(obj, ensure_ascii=False),
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)
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session_factory = 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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autoflush=False,
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)
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saver_cm = AIOMySQLSaver.from_conn_string(_checkpoint_conn_string(db_url))
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checkpointer = await saver_cm.__aenter__()
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async def setup() -> None:
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# 1. LangGraph checkpoint tables / migrations
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await checkpointer.setup()
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# 2. ORM business tables
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async with engine.begin() as conn:
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await conn.run_sync(MappedBase.metadata.create_all)
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async def _close_saver() -> None:
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await saver_cm.__aexit__(None, None, None)
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async def aclose() -> None:
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await close_in_order(
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engine.dispose,
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_close_saver,
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)
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return AppPersistence(
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checkpointer=checkpointer,
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engine=engine,
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session_factory=session_factory,
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setup=setup,
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aclose=aclose,
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)
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