*_chat 接口中，当 max_tokens=0时，将其设为 None,避免 swagger ui 中默认值为0时访问出错

server/chat/agent_chat.py

@@ -44,6 +44,9 @@ async def agent_chat(query: str = Body(..., description="用户输入", examples
             prompt_name: str = prompt_name,
     ) -> AsyncIterable[str]:
         callback = CustomAsyncIteratorCallbackHandler()
+        if isinstance(max_tokens, int) and max_tokens <= 0:
+            max_tokens = None
+
         model = get_ChatOpenAI(
             model_name=model_name,
             temperature=temperature,

server/chat/chat.py

@@ -45,7 +45,8 @@ async def chat(query: str = Body(..., description="用户输入", examples=["恼
                                                             chat_type="llm_chat",
                                                             query=query)
         callbacks.append(conversation_callback)
-
+        if isinstance(max_tokens, int) and max_tokens <= 0:
+            max_tokens = None
 
         model = get_ChatOpenAI(
             model_name=model_name,

server/chat/completion.py

@@ -28,6 +28,9 @@ async def completion(query: str = Body(..., description="用户输入", examples
                                   echo: bool = echo,
                                   ) -> AsyncIterable[str]:
         callback = AsyncIteratorCallbackHandler()
+        if isinstance(max_tokens, int) and max_tokens <= 0:
+            max_tokens = None
+
         model = get_OpenAI(
             model_name=model_name,
             temperature=temperature,

server/chat/file_chat.py

@@ -114,6 +114,9 @@ async def file_chat(query: str = Body(..., description="用户输入", examples=
 
     async def knowledge_base_chat_iterator() -> AsyncIterable[str]:
         callback = AsyncIteratorCallbackHandler()
+        if isinstance(max_tokens, int) and max_tokens <= 0:
+            max_tokens = None
+
         model = get_ChatOpenAI(
             model_name=model_name,
             temperature=temperature,

server/chat/knowledge_base_chat.py

@@ -49,6 +49,9 @@ async def knowledge_base_chat(query: str = Body(..., description="用户输入",
                                            prompt_name: str = prompt_name,
                                            ) -> AsyncIterable[str]:
         callback = AsyncIteratorCallbackHandler()
+        if isinstance(max_tokens, int) and max_tokens <= 0:
+            max_tokens = None
+
         model = get_ChatOpenAI(
             model_name=model_name,
             temperature=temperature,

server/chat/search_engine_chat.py

@@ -148,6 +148,9 @@ async def search_engine_chat(query: str = Body(..., description="用户输入",
                                           prompt_name: str = prompt_name,
                                           ) -> AsyncIterable[str]:
         callback = AsyncIteratorCallbackHandler()
+        if isinstance(max_tokens, int) and max_tokens <= 0:
+            max_tokens = None
+
         model = get_ChatOpenAI(
             model_name=model_name,
             temperature=temperature,