feat: 准备实现工具的中断恢复功能

app/controller/add_langgraph_chat_route.py

@@ -13,47 +13,46 @@ from pydantic import BaseModel, Field
 from starlette.responses import StreamingResponse
 
 from app.utils.llm_utils import create_llm
-from app.utils.postgres_checkpointer import PostgresCheckpointerManager
+from app.utils.postgres_checkpointer import PostgresCheckpointerManager, AsyncPostgresSaverDep
 
 
 # /*---------------------------------------获取时间工具-------------------------------------------*/
-@tool(name_or_callable="获取时间工具", description="一个用于获取当前时间的工具，没有参数")
+@tool(
+  name_or_callable="tool_get_datetime",
+  description="一个用于获取当前时间的工具，没有参数"
+)
 def tool_get_datetime():
   return datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S")
 
 
 @tool(
-  name_or_callable="乘法工具",
+  name_or_callable="tool_multiply",
   description="一个乘法工具，用于计算两个数字相乘"
 )
-def multiple_tool(
+def tool_multiply(
   number1: Annotated[float, "第一个要相乘的数字"],
   number2: Annotated[float, "第二个要相乘的数字"],
 ) -> float:
-  print("\n invoke multiple_tool", number1, number2, '\n')
+  print("\n invoke tool_multiply", number1, number2, '\n')
 
   return float(number1) * float(number2)
 
 
 @tool(
-  name_or_callable="加法工具",
+  name_or_callable="tool_add",
   description="一个加法工具，用于计算两个数字相加"
 )
-def add_tool(
+def tool_add(
   number1: Annotated[float, "第一个要相加的数字"],
   number2: Annotated[float, "第二个要相加的数字"],
 ) -> float:
-  print("\n invoke add_tool", number1, number2, '\n')
+  print("\n invoke tool_add", number1, number2, '\n')
 
   return float(number1) + float(number2)
 
 
 @tool(name_or_callable="tool_book_hotel", description="一个用于预定酒店的工具")
-def tool_book_hotel(
-  hotel_name: Annotated[str, '酒店名称'],
-  room_type: Annotated[str, '房间类型'],
-  check_in_date: Annotated[str, '入住时间'],
-) -> str:
+def tool_book_hotel() -> str:
   resume_data = interrupt({
     "title": "请确认酒店预定信息",
     "form": [
@@ -81,24 +80,15 @@ def tool_book_hotel(
       }
     ],
     "formData": {
-      "hotel_name": hotel_name,
-      "room_type": room_type,
-      "check_in_date": check_in_date,
+      "hotel_name": '',
+      "room_type": '',
+      "check_in_date": '',
     }
   })
   if resume_data == "N":
     return f"用户选择取消预定酒店"
 
-  old_book_data = {
-    "hotel_name": hotel_name,
-    "room_type": room_type,
-    "check_in_date": check_in_date,
-  }
-  new_book_data: dict = resume_data
-
-  change_field_list = [(k, v) for k, v in old_book_data.items() if old_book_data.get(k) != new_book_data.get(k)]
-
-  return (f"用户已经更改参数，最新的为{json.dumps(new_book_data, ensure_ascii=False)}" if change_field_list else "") + "，结果为预定成功"
+  return "预定成功"
 
 
 class ChatMessage(BaseModel):
@@ -124,8 +114,8 @@ class ChatAgent:
         tools=[
           tool_book_hotel,
           tool_get_datetime,
-          add_tool,
-          multiple_tool,
+          tool_add,
+          tool_multiply,
         ],
         checkpointer=await PostgresCheckpointerManager.get_instance(),
         prompt="""
@@ -151,7 +141,7 @@ class ChatAgent:
 def add_langgraph_chat_route(app: FastAPI):
   # 流式对话接口
   @app.post("/langgraph/stream")
-  async def langgraph_stream(body: dict):
+  async def langgraph_stream(body: dict, checkpointer: AsyncPostgresSaverDep):
     print(":::::::::::::::::::::::::langgraph_stream:::::::::::::::::::::")
     print(body)
 
@@ -161,6 +151,9 @@ def add_langgraph_chat_route(app: FastAPI):
     print("stream_input", stream_input)
     print("stream_config", stream_config)
 
+    # 暂时每次对话的时候清理掉对话历史
+    await checkpointer.adelete_thread(stream_config.get('configurable').get('thread_id'))
+
     async def generator_function():
 
       graph = await ChatAgent.get_agent()
@@ -183,10 +176,17 @@ def add_langgraph_chat_route(app: FastAPI):
         emit_chunk = {"stream_type": chunk[0], }
 
         if emit_chunk['stream_type'] == "messages":
+          # messages模式流式输出，此时 chunk[1][0] 为AIMessageChunk
           chunk_message = chunk[1][0]
         else:
+          # updates模式流式输出
           for k, v in chunk[1].items():
-            chunk_message = v.get('messages')[0]
+            if k == 'agent' or k == 'tool':
+              chunk_message = v.get('messages')[0]
+            elif k == '__interrupt__':
+              chunk_message = AIMessage(content='')
+              emit_chunk['stream_type'] = 'interrupt'
+              emit_chunk['interrupt'] = v[0].value
 
         emit_chunk = {
           **emit_chunk,