74 lines
2.2 KiB
Python
74 lines
2.2 KiB
Python
"""
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文档存储工厂 - 创建不同类型的存储实例。
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提供统一的接口来创建本地文件存储或 PostgreSQL 存储。
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"""
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import os
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import logging
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from typing import Optional, Tuple
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from langchain_core.stores import BaseStore
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from .postgres import PostgresDocStore
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logger = logging.getLogger(__name__)
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# 默认连接字符串（从环境变量读取）
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DEFAULT_DB_URI = os.getenv(
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"DB_URI",
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"postgresql://postgres:huang1998@ai-postgres:5432/langgraph_db?sslmode=disable"
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)
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def get_docstore_uri() -> str:
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"""获取 docstore 专用的数据库连接字符串（可与主库相同）"""
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return os.getenv("DOCSTORE_URI", DEFAULT_DB_URI)
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def create_docstore(
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store_type: str = "postgres",
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connection_string: Optional[str] = None,
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table_name: str = "parent_documents",
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pool_config: Optional[dict] = None,
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max_concurrency: Optional[int] = None
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) -> Tuple[BaseStore, Optional[str]]:
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"""
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工厂函数，创建 PostgreSQL 文档存储。
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Args:
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store_type: 存储类型，目前仅支持 "postgres"（默认）
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connection_string: PostgreSQL 连接字符串
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table_name: PostgreSQL 表名（默认：parent_documents）
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pool_config: 连接池配置
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max_concurrency: 最大并发操作数，如果为 None 则不限制
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Returns:
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元组 (存储实例, 连接字符串)
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Raises:
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ValueError: 不支持的存储类型
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ImportError: 缺少必要的依赖
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Example:
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>>> # 创建 PostgreSQL 存储
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>>> store, conn = create_docstore(
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... connection_string="postgresql://user:pass@host:5432/db",
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... table_name="parent_docs",
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... max_concurrency=10
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... )
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"""
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store_type = store_type.lower()
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if store_type == "postgres":
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conn_str = connection_string or get_docstore_uri()
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store = PostgresDocStore(
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connection_string=conn_str,
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table_name=table_name,
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pool_config=pool_config,
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max_concurrency=max_concurrency
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)
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return store, conn_str
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else:
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raise ValueError(f"不支持的存储类型: {store_type}。目前仅支持: postgres")
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