refactor: 适配了 langchain v1 版本，但并引入新特性，仅无兼容性错误

pyproject.toml

@@ -5,8 +5,8 @@ description = "Add your description here"
 readme = "README.md"
 requires-python = ">=3.11"
 dependencies = [
-    "arxiv>=2.2.0",
     "asyncpg>=0.30.0",
+    "langchain==1.0",
     "chromadb>=1.0.15",
     "colorlog>=6.9.0",
     "dashscope>=1.23.2",
@@ -19,8 +19,7 @@ dependencies = [
     "langchain-openai>=0.3.14",
     "langchain-tavily>=0.2.3",
     "langchain-text-splitters>=0.3.9",
-    "langchain-together>=0.3.0",
+    "langgraph==1.0.1",
-    "langgraph>=0.3.34",
     "langgraph-checkpoint-sqlite>=2.0.7",
     "langgraph-cli[inmem]>=0.1.54",
     "langsmith>=0.3.37",

server/routers/chat_router.py

@@ -7,7 +7,7 @@ from pathlib import Path
 
 from fastapi import APIRouter, Body, Depends, HTTPException
 from fastapi.responses import StreamingResponse
-from langchain_core.messages import AIMessageChunk, HumanMessage
+from langchain.messages import AIMessageChunk, HumanMessage
 from pydantic import BaseModel
 from sqlalchemy.orm import Session
 

src/agents/chatbot/graph.py

@@ -1,6 +1,6 @@
 from typing import Any, cast
 
-from langchain_core.messages import AIMessage, ToolMessage
+from langchain.messages import AIMessage, ToolMessage
 from langgraph.graph import END, START, StateGraph
 from langgraph.prebuilt import ToolNode, tools_condition
 from langgraph.runtime import Runtime

src/agents/chatbot/state.py

@@ -6,7 +6,7 @@ from collections.abc import Sequence
 from dataclasses import dataclass, field
 from typing import Annotated
 
-from langchain_core.messages import AnyMessage
+from langchain.messages import AnyMessage
 from langgraph.graph import add_messages
 
 

src/agents/chatbot/tools.py

@@ -2,7 +2,7 @@ import os
 from typing import Any
 
 import requests
-from langchain_core.tools import tool
+from langchain.tools import tool
 
 from src.agents.common.toolkits.mysql import get_mysql_tools
 from src.agents.common.tools import get_buildin_tools

src/agents/common/models.py

@@ -1,7 +1,7 @@
 import os
 import traceback
 
-from langchain_core.language_models import BaseChatModel
+from langchain.chat_models import BaseChatModel
 from pydantic import SecretStr
 
 from src import config
@@ -37,15 +37,15 @@ def load_chat_model(fully_specified_name: str, **kwargs) -> BaseChatModel:
             stream_usage=True,
         )
 
-    elif provider == "together":
+    # elif provider == "together":
-        from langchain_together import ChatTogether
+    #     from langchain_together import ChatTogether
 
-        return ChatTogether(
+    #     return ChatTogether(
-            model=model,
+    #         model=model,
-            api_key=SecretStr(api_key),
+    #         api_key=SecretStr(api_key),
-            base_url=base_url,
+    #         base_url=base_url,
-            stream_usage=True,
+    #         stream_usage=True,
-        )
+    #     )
 
     else:
         try:  # 其他模型，默认使用OpenAIBase, like openai, zhipuai

src/agents/common/toolkits/mysql/tools.py

@@ -1,6 +1,6 @@
 from typing import Annotated, Any
 
-from langchain_core.tools import tool
+from langchain.tools import tool
 from pydantic import BaseModel, Field
 
 from src.utils import logger

src/agents/common/tools.py

@@ -2,7 +2,8 @@ import asyncio
 import traceback
 from typing import Annotated, Any
 
-from langchain_core.tools import StructuredTool, tool
+from langchain.tools import tool
+from langchain_core.tools import StructuredTool
 from langchain_tavily import TavilySearch
 from pydantic import BaseModel, Field
 

src/agents/common/utils.py

@@ -1,6 +1,6 @@
 from datetime import UTC, datetime
 
-from langchain_core.messages import AIMessageChunk, ToolMessage
+from langchain.messages import AIMessageChunk, ToolMessage
 from langchain_core.runnables import RunnableConfig
 
 from src.agents.common.base import BaseAgent

src/agents/react/graph.py

@@ -1,6 +1,6 @@
 from pathlib import Path
 
-from langchain_core.messages import AnyMessage, SystemMessage
+from langchain.messages import AnyMessage, SystemMessage
 from langgraph.prebuilt import create_react_agent
 from langgraph.runtime import get_runtime
 

src/knowledge/indexing.py

@@ -2,7 +2,7 @@ import asyncio
 import os
 from pathlib import Path
 
-from langchain.text_splitter import RecursiveCharacterTextSplitter
+from langchain_text_splitters import RecursiveCharacterTextSplitter
 from langchain_community.document_loaders import (
     CSVLoader,
     JSONLoader,