feat: add generate_answer function to support non streamed response for api brain (#1847)

Issue: https://github.com/StanGirard/quivr/issues/1841

Demo:


https://github.com/StanGirard/quivr/assets/63923024/56dfa85c-6c2e-4e55-8eda-4723e58ced1d

backend/llm/api_brain_qa.py

@@ -1,14 +1,11 @@
+import asyncio
 import json
 from typing import Optional
 from uuid import UUID
 
+import nest_asyncio
 from fastapi import HTTPException
 from litellm import completion
-from llm.knowledge_brain_qa import KnowledgeBrainQA
-from llm.utils.call_brain_api import call_brain_api
-from llm.utils.get_api_brain_definition_as_json_schema import (
-    get_api_brain_definition_as_json_schema,
-)
 from logger import get_logger
 from modules.brain.service.brain_service import BrainService
 from modules.chat.dto.chats import ChatQuestion
@@ -16,6 +13,12 @@ from modules.chat.dto.inputs import CreateChatHistory
 from modules.chat.dto.outputs import GetChatHistoryOutput
 from modules.chat.service.chat_service import ChatService
 
+from llm.knowledge_brain_qa import KnowledgeBrainQA
+from llm.utils.call_brain_api import call_brain_api
+from llm.utils.get_api_brain_definition_as_json_schema import (
+    get_api_brain_definition_as_json_schema,
+)
+
 brain_service = BrainService()
 chat_service = ChatService()
 
@@ -56,13 +59,15 @@ class APIBrainQA(
         functions,
         brain_id: UUID,
         recursive_count=0,
+        should_log_steps=False,
     ):
         if recursive_count > 5:
-            yield "🧠<Deciding what to do>🧠"
             yield "The assistant is having issues and took more than 5 calls to the API. Please try again later or an other instruction."
             return
 
+        if should_log_steps:
             yield "🧠<Deciding what to do>🧠"
+
         response = completion(
             model=self.model,
             temperature=self.temperature,
@@ -98,6 +103,8 @@ class APIBrainQA(
 
                 except Exception:
                     arguments = {}
+
+                if should_log_steps:
                     yield f"🧠<Calling {brain_id} with arguments {arguments}>🧠"
 
                 try:
@@ -125,6 +132,7 @@ class APIBrainQA(
                     functions=functions,
                     brain_id=brain_id,
                     recursive_count=recursive_count + 1,
+                    should_log_steps=should_log_steps,
                 ):
                     yield value
 
@@ -140,7 +148,12 @@ class APIBrainQA(
                     yield "**...**"
                     break
 
-    async def generate_stream(self, chat_id: UUID, question: ChatQuestion):
+    async def generate_stream(
+        self,
+        chat_id: UUID,
+        question: ChatQuestion,
+        should_log_steps: Optional[bool] = True,
+    ):
         if not question.brain_id:
             raise HTTPException(
                 status_code=400, detail="No brain id provided in the question"
@@ -198,6 +211,7 @@ class APIBrainQA(
             messages=messages,
             functions=[get_api_brain_definition_as_json_schema(brain)],
             brain_id=question.brain_id,
+            should_log_steps=should_log_steps,
         ):
             streamed_chat_history.assistant = value
             response_tokens.append(value)
@@ -212,3 +226,27 @@ class APIBrainQA(
             user_message=question.question,
             assistant="".join(response_tokens),
         )
+
+    def generate_answer(self, chat_id: UUID, question: ChatQuestion):
+        async def a_generate_answer():
+            api_brain_question_answer: GetChatHistoryOutput = None
+
+            async for answer in self.generate_stream(
+                chat_id, question, should_log_steps=False
+            ):
+                answer = answer.split("data: ")[1]
+                answer_parsed: GetChatHistoryOutput = GetChatHistoryOutput(
+                    **json.loads(answer)
+                )
+                if api_brain_question_answer is None:
+                    api_brain_question_answer = answer_parsed
+                else:
+                    api_brain_question_answer.assistant += answer_parsed.assistant
+
+            return api_brain_question_answer
+
+        nest_asyncio.apply()
+        loop = asyncio.get_event_loop()
+        result = loop.run_until_complete(a_generate_answer())
+
+        return result

backend/requirements.txt

@@ -5,6 +5,7 @@ litellm==1.7.7
 openai==1.1.1
 GitPython==3.1.36
 pdf2image==1.16.3
+nest_asyncio==1.5.6
 pypdf==3.9.0
 supabase==1.1.0
 tiktoken==0.4.0