feat：完成重构和测试

app/processor/nodes/intent_node.py

@@ -14,8 +14,10 @@ class IntentNode(BaseNode):
 
     async def process(self, state: QueryState) -> QueryState:
         updated_state: QueryState = state.copy()
+        context = state["input_context"]
         request = DecisionRequest(
-            state=request_summary(state["input_context"]),
+            # Jev 只接收 JSON，会话历史作为 history 字段和本次请求放在一起
+            state={"history": context.history, **request_summary(context)},
             decisions={"intent": build_intent_question()},
         )
         response = await get_decision_engine().run(request)

app/processor/nodes/qa_node.py

@@ -6,6 +6,7 @@ from langgraph.config import get_stream_writer
 
 from app.clients.llm import get_llm
 from app.processor.base import BaseNode
+from app.processor.history import history_messages
 from app.processor.state import QueryState
 from app.prompt.qa import QA_SYSTEM_PROMPT
 
@@ -24,11 +25,16 @@ class QANode(BaseNode):
 
         parser = StrOutputParser()
         parts: list[str] = []
+        context = state["input_context"]
         async for chunk in get_llm().astream(
             [
                 SystemMessage(content=QA_SYSTEM_PROMPT),
+                # 会话历史作为此前的对话消息，本次请求是最后一条用户消息
+                *history_messages(context.history),
                 HumanMessage(
-                    content=state["input_context"].model_dump_json(exclude_unset=True)
+                    content=context.model_dump_json(
+                        exclude_unset=True, exclude={"history"}
+                    )
                 ),
             ]
         ):

app/processor/nodes/screen_agent_node.py

@@ -10,6 +10,7 @@ from langchain_core.messages import HumanMessage
 from app.agent.screen_agent import AgentReply, get_screen_agent
 from app.agent.tools import ScreenAgentContext
 from app.processor.base import BaseNode
+from app.processor.history import history_messages
 from app.processor.state import QueryState
 from app.processor.summary import request_summary
 from app.resources.component import get_catalog_cache
@@ -55,10 +56,12 @@ class ScreenAgentNode(BaseNode):
         agent = await get_screen_agent()
         result = await agent.ainvoke(
             {
+                # 会话历史作为此前的对话消息，本次请求是最后一条用户消息
                 "messages": [
+                    *history_messages(context.history),
                     HumanMessage(
                         content=json.dumps(request_summary(context), ensure_ascii=False)
-                    )
+                    ),
                 ]
             },
             context=ScreenAgentContext(screen=context.screen, catalog=catalog),