fix： 调整 HTTP 方式的知识库query

app/api/routes.py

@@ -1,6 +1,7 @@
 import json
 import logging
 import os
+import time
 from fastapi import APIRouter, UploadFile, File, HTTPException, Body, Header, Depends
 from fastapi.responses import StreamingResponse
 from pydantic import BaseModel
@@ -115,16 +116,25 @@ async def query_knowledge_base(
     """
     try:
         # 构造查询参数
-        param = QueryParam(
+        context_param = QueryParam(
             mode=request.mode, 
             top_k=request.top_k,
-            stream=request.stream,
+            only_need_context=True,
             enable_rerank=settings.RERANK_ENABLED
         )
+        
+        # 执行上下文检索
+        context_resp = await rag.aquery(request.query, param=context_param)
+        
+        # 判断检索命中状态
+        rag_status = "miss"
+        has_context = False
+        if context_resp and "[no-context]" not in context_resp and "None" not in context_resp:
+            rag_status = "hit"
+            has_context = True
 
         # 处理流式输出 (SSE 协议 - OpenAI 兼容格式)
         if request.stream:
-            import time
             async def stream_generator():
                 chat_id = f"chatcmpl-{secrets.token_hex(12)}"
                 created_time = int(time.time())
@@ -155,37 +165,15 @@ async def query_knowledge_base(
                     }
                     return f"data: {json.dumps(chunk, ensure_ascii=False)}\n\n"
 
-                # 1. 发送检索状态 (作为思考过程的一部分)
-                yield openai_chunk(reasoning_content="1. 上下文检索中...\n")
-                
-                context_param = QueryParam(
-                    mode=request.mode, 
-                    top_k=request.top_k,
-                    only_need_context=True,
-                    enable_rerank=settings.RERANK_ENABLED
-                )
-                
-                # 获取上下文
-                context_resp = await rag.aquery(request.query, param=context_param)
-                logging.info(f"Context Response: {context_resp}")
-                
-                # 判断检索状态
-                has_context = False
-                if context_resp and "[no-context]" not in context_resp and "None" not in context_resp:
-                    has_context = True
-                
-                # 判断是否开启think
-                think = request.think
-
                 if has_context:
                     yield openai_chunk(
-                        reasoning_content=f"2. 上下文已检索 (长度: {len(context_resp)} 字符).\n",
+                        reasoning_content=f"1. 上下文已检索 (长度: {len(context_resp)} 字符).\n",
-                        extra_delta={"x_rag_status": "hit"}
+                        extra_delta={"x_rag_status": rag_status}
                     )
                 else:
                     yield openai_chunk(
-                        reasoning_content="2. 未找到相关上下文\n",
+                        reasoning_content="未找到相关上下文\n",
-                        extra_delta={"x_rag_status": "miss"}
+                        extra_delta={"x_rag_status": rag_status}
                     )
                     
                     # 如果开启了仅RAG模式且未找到上下文，则直接结束
@@ -195,9 +183,11 @@ async def query_knowledge_base(
                         return
 
                     yield openai_chunk(reasoning_content="   (将依赖 LLM 自身知识)\n")
-                    think = False
 
-                yield openai_chunk(reasoning_content="3. 答案生成中...\n")
+                    # 未找到上下文，关闭思考模式
+                    request.think = False
+
+                yield openai_chunk(reasoning_content="2. 答案生成中...\n")
                 
                 # 2. 生成答案
                 sys_prompt = CUSTOM_RAG_RESPONSE_PROMPT.format(
@@ -211,7 +201,7 @@ async def query_knowledge_base(
                     request.query, 
                     system_prompt=sys_prompt, 
                     stream=True,
-                    think=think,
+                    think=request.think,
                     hashing_kv=rag.llm_response_cache
                 )
                 
@@ -231,9 +221,56 @@ async def query_knowledge_base(
             # 使用 text/event-stream Content-Type
             return StreamingResponse(stream_generator(), media_type="text/event-stream")
 
-        # 处理普通输出
+        # 处理普通输出 (OpenAI 兼容格式)
-        response = await rag.aquery(request.query, param=param)
+        # 根据策略生成回答
-        return {"response": response}
+        final_answer = ""
+        
+        if not has_context and request.only_rag:
+            # 严格模式且未检索到，直接结束
+            final_answer = "未找到相关知识库内容。"
+        else:
+            # 正常生成
+            sys_prompt = CUSTOM_RAG_RESPONSE_PROMPT.format(
+                context_data=context_resp, 
+                response_type="Multiple Paragraphs",
+                user_prompt=""
+            )
+            
+            # 调用 LLM 生成
+            stream_resp = await llm_func(
+                request.query, 
+                system_prompt=sys_prompt, 
+                stream=False,
+                think=request.think,
+                hashing_kv=rag.llm_response_cache
+            )
+            
+            # 非流式调用 LLM 直接返回结果
+            final_answer = stream_resp
+
+        return {
+            "id": f"chatcmpl-{secrets.token_hex(12)}",
+            "object": "chat.completion",
+            "created": int(time.time()),
+            "model": settings.LLM_MODEL,
+            "choices": [
+                {
+                    "index": 0,
+                    "message": {
+                        "role": "assistant",
+                        "content": final_answer,
+                        # 扩展字段：非标准，但在某些客户端可能有用，或者放入 usage/metadata
+                        "x_rag_status": rag_status
+                    },
+                    "finish_reason": "stop"
+                }
+            ],
+            "usage": {
+                "prompt_tokens": -1, 
+                "completion_tokens": len(final_answer),
+                "total_tokens": -1
+            }
+        }
 
     except Exception as e:
         logging.error(f"查询失败: {str(e)}")