rayhpeng
b5e18f5b47
Add to packages/storage/: - README.md and README_zh.md - comprehensive documentation - store/persistence/async_provider.py - async persistence provider Update repositories: - contracts/thread_meta.py - add new contract method - db/thread_meta.py - implement new method - factory.py - update factory logic Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
77 lines
2.2 KiB
Python
77 lines
2.2 KiB
Python
from __future__ import annotations
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import asyncio
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from contextlib import asynccontextmanager
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from typing import AsyncIterator
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from sqlalchemy import URL
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from store.config.app_config import get_app_config
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@asynccontextmanager
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async def make_checkpointer() -> AsyncIterator[object]:
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"""Create a LangGraph checkpointer from the unified storage config."""
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storage = get_app_config().storage
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if storage.driver == "sqlite":
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from langgraph.checkpoint.sqlite.aio import AsyncSqliteSaver
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conn_str = storage.sqlite_storage_path
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await asyncio.to_thread(_ensure_sqlite_parent_dir, conn_str)
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async with AsyncSqliteSaver.from_conn_string(conn_str) as saver:
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await saver.setup()
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yield saver
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return
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if storage.driver == "postgres":
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from langgraph.checkpoint.postgres.aio import AsyncPostgresSaver
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async with AsyncPostgresSaver.from_conn_string(_create_postgres_url(storage)) as saver:
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await saver.setup()
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yield saver
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return
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if storage.driver == "mysql":
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from langgraph.checkpoint.mysql.aio import AIOMySQLSaver
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async with AIOMySQLSaver.from_conn_string(_create_mysql_url(storage)) as saver:
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await saver.setup()
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yield saver
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return
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raise ValueError(f"Unsupported storage driver for checkpointer: {storage.driver}")
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def _ensure_sqlite_parent_dir(connection_string: str) -> None:
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from pathlib import Path
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if connection_string == ":memory:":
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return
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Path(connection_string).expanduser().parent.mkdir(parents=True, exist_ok=True)
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def _create_postgres_url(storage) -> URL:
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return URL.create(
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drivername="postgresql+asyncpg",
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username=storage.username,
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password=storage.password,
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host=storage.host,
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port=storage.port,
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database=storage.db_name or "deerflow",
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)
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def _create_mysql_url(storage) -> URL:
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return URL.create(
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drivername="mysql+aiomysql",
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username=storage.username,
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password=storage.password,
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host=storage.host,
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port=storage.port,
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database=storage.db_name or "deerflow",
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)
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__all__ = ["make_checkpointer"]
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