文件对话和知识库对话 API 接口实现全异步操作，防止阻塞 (#2256)

* EmbeddingFunAdapter 支持异步操作；文件对话和知识库对话 API 接口实现全异步操作，防止阻塞

* 修复： 使 list_files_from_folder 返回相对路径

server/chat/chat.py

@@ -40,9 +40,8 @@ async def chat(query: str = Body(..., description="用户输入", examples=["恼
         callbacks = [callback]
         memory = None
 
-        if conversation_id:
-            message_id = add_message_to_db(chat_type="llm_chat", query=query, conversation_id=conversation_id)
         # 负责保存llm response到message db
+        message_id = add_message_to_db(chat_type="llm_chat", query=query, conversation_id=conversation_id)
         conversation_callback = ConversationCallbackHandler(conversation_id=conversation_id, message_id=message_id,
                                                             chat_type="llm_chat",
                                                             query=query)

server/chat/file_chat.py

@@ -125,7 +125,7 @@ async def file_chat(query: str = Body(..., description="用户输入", examples=
             callbacks=[callback],
         )
         embed_func = EmbeddingsFunAdapter()
-        embeddings = embed_func.embed_query(query)
+        embeddings = await embed_func.aembed_query(query)
         with memo_faiss_pool.acquire(knowledge_id) as vs:
             docs = vs.similarity_search_with_score_by_vector(embeddings, k=top_k, score_threshold=score_threshold)
             docs = [x[0] for x in docs]

server/chat/knowledge_base_chat.py

@@ -1,5 +1,6 @@
 from fastapi import Body, Request
 from fastapi.responses import StreamingResponse
+from fastapi.concurrency import run_in_threadpool
 from configs import (LLM_MODELS, VECTOR_SEARCH_TOP_K, SCORE_THRESHOLD, TEMPERATURE)
 from server.utils import wrap_done, get_ChatOpenAI
 from server.utils import BaseResponse, get_prompt_template
@@ -10,9 +11,7 @@ import asyncio
 from langchain.prompts.chat import ChatPromptTemplate
 from server.chat.utils import History
 from server.knowledge_base.kb_service.base import KBServiceFactory
-from server.knowledge_base.utils import get_doc_path
 import json
-from pathlib import Path
 from urllib.parse import urlencode
 from server.knowledge_base.kb_doc_api import search_docs
 
@@ -72,7 +71,11 @@ async def knowledge_base_chat(query: str = Body(..., description="用户输入",
             max_tokens=max_tokens,
             callbacks=[callback],
         )
-        docs = search_docs(query, knowledge_base_name, top_k, score_threshold)
+        docs = await run_in_threadpool(search_docs,
+                                       query=query,
+                                       knowledge_base_name=knowledge_base_name,
+                                       top_k=top_k,
+                                       score_threshold=score_threshold)
         context = "\n".join([doc.page_content for doc in docs])
         if len(docs) == 0:  # 如果没有找到相关文档，使用empty模板
             prompt_template = get_prompt_template("knowledge_base_chat", "empty")

server/embeddings_api.py

@@ -3,6 +3,7 @@ from configs import EMBEDDING_MODEL, logger
 from server.model_workers.base import ApiEmbeddingsParams
 from server.utils import BaseResponse, get_model_worker_config, list_embed_models, list_online_embed_models
 from fastapi import Body
+from fastapi.concurrency import run_in_threadpool
 from typing import Dict, List
 
 
@@ -39,6 +40,32 @@ def embed_texts(
         logger.error(e)
         return BaseResponse(code=500, msg=f"文本向量化过程中出现错误：{e}")
 
+
+async def aembed_texts(
+    texts: List[str],
+    embed_model: str = EMBEDDING_MODEL,
+    to_query: bool = False,
+) -> BaseResponse:
+    '''
+    对文本进行向量化。返回数据格式：BaseResponse(data=List[List[float]])
+    '''
+    try:
+        if embed_model in list_embed_models(): # 使用本地Embeddings模型
+            from server.utils import load_local_embeddings
+
+            embeddings = load_local_embeddings(model=embed_model)
+            return BaseResponse(data=await embeddings.aembed_documents(texts))
+
+        if embed_model in list_online_embed_models(): # 使用在线API
+            return await run_in_threadpool(embed_texts,
+                                           texts=texts,
+                                           embed_model=embed_model,
+                                           to_query=to_query)
+    except Exception as e:
+        logger.error(e)
+        return BaseResponse(code=500, msg=f"文本向量化过程中出现错误：{e}")
+
+
 def embed_texts_endpoint(
     texts: List[str] = Body(..., description="要嵌入的文本列表", examples=[["hello", "world"]]),
     embed_model: str = Body(EMBEDDING_MODEL, description=f"使用的嵌入模型，除了本地部署的Embedding模型，也支持在线API({online_embed_models})提供的嵌入服务。"),

server/knowledge_base/kb_service/base.py

@@ -26,8 +26,7 @@ from server.knowledge_base.utils import (
 
 from typing import List, Union, Dict, Optional
 
-from server.embeddings_api import embed_texts
-from server.embeddings_api import embed_documents
+from server.embeddings_api import embed_texts, aembed_texts, embed_documents
 from server.knowledge_base.model.kb_document_model import DocumentWithVSId
 
 
@@ -405,12 +404,16 @@ class EmbeddingsFunAdapter(Embeddings):
         normalized_query_embed = normalize(query_embed_2d)
         return normalized_query_embed[0].tolist()  # 将结果转换为一维数组并返回
 
-    # TODO: 暂不支持异步
-    # async def aembed_documents(self, texts: List[str]) -> List[List[float]]:
-    #     return normalize(await self.embeddings.aembed_documents(texts))
+    async def aembed_documents(self, texts: List[str]) -> List[List[float]]:
+        embeddings = (await aembed_texts(texts=texts, embed_model=self.embed_model, to_query=False)).data
+        return normalize(embeddings).tolist()
 
-    # async def aembed_query(self, text: str) -> List[float]:
-    #     return normalize(await self.embeddings.aembed_query(text))
+    async def aembed_query(self, text: str) -> List[float]:
+        embeddings = (await aembed_texts(texts=[text], embed_model=self.embed_model, to_query=True)).data
+        query_embed = embeddings[0]
+        query_embed_2d = np.reshape(query_embed, (1, -1))  # 将一维数组转换为二维数组
+        normalized_query_embed = normalize(query_embed_2d)
+        return normalized_query_embed[0].tolist()  # 将结果转换为一维数组并返回
 
 
 def score_threshold_process(score_threshold, k, docs):

server/knowledge_base/utils.py

@@ -71,7 +71,7 @@ def list_files_from_folder(kb_name: str):
                 for target_entry in target_it:
                     process_entry(target_entry)
         elif entry.is_file():
-            result.append(entry.path)
+            result.append(os.path.relpath(entry.path, doc_path))
         elif entry.is_dir():
             with os.scandir(entry.path) as it:
                 for sub_entry in it: