Merge pull request #530 from MODSetter/dev

fix: implement real-time streaming for responses

surfsense_backend/app/agents/researcher/nodes.py

@@ -1440,7 +1440,12 @@ async def handle_qna_workflow(
     }
 
     # Create the state for the QNA agent (it has a different state structure)
-    qna_state = {"db_session": state.db_session, "chat_history": state.chat_history}
+    # Pass streaming_service so the QNA agent can stream tokens directly
+    qna_state = {
+        "db_session": state.db_session,
+        "chat_history": state.chat_history,
+        "streaming_service": streaming_service,
+    }
 
     try:
         writer(
@@ -1455,36 +1460,26 @@ async def handle_qna_workflow(
         complete_content = ""
         captured_reranked_documents = []
 
-        # Call the QNA agent with streaming
-        async for _chunk_type, chunk in qna_agent_graph.astream(
-            qna_state, qna_config, stream_mode=["values"]
+        # Call the QNA agent with both custom and values streaming modes
+        # - "custom" captures token-by-token streams from answer_question via writer()
+        # - "values" captures state updates including final_answer and reranked_documents
+        async for stream_mode, chunk in qna_agent_graph.astream(
+            qna_state, qna_config, stream_mode=["custom", "values"]
         ):
-            if "final_answer" in chunk:
-                new_content = chunk["final_answer"]
-                if new_content and new_content != complete_content:
-                    # Extract only the new content (delta)
-                    delta = new_content[len(complete_content) :]
-                    complete_content = new_content
+            if stream_mode == "custom":
+                # Handle custom stream events (token chunks from answer_question)
+                if isinstance(chunk, dict) and "yield_value" in chunk:
+                    # Forward the streamed token to the parent writer
+                    writer(chunk)
+            elif stream_mode == "values" and isinstance(chunk, dict):
+                # Handle state value updates
+                # Capture the final answer from state
+                if chunk.get("final_answer"):
+                    complete_content = chunk["final_answer"]
 
-                    # Stream the real-time answer if there's new content
-                    if delta:
-                        # Update terminal with progress
-                        word_count = len(complete_content.split())
-                        writer(
-                            {
-                                "yield_value": streaming_service.format_terminal_info_delta(
-                                    f"✍️ Writing answer... ({word_count} words)"
-                                )
-                            }
-                        )
-
-                        writer(
-                            {"yield_value": streaming_service.format_text_chunk(delta)}
-                        )
-
-            # Capture reranked documents from QNA agent for further question generation
-            if "reranked_documents" in chunk:
-                captured_reranked_documents = chunk["reranked_documents"]
+                # Capture reranked documents from QNA agent for further question generation
+                if chunk.get("reranked_documents"):
+                    captured_reranked_documents = chunk["reranked_documents"]
 
         # Set default if no content was received
         if not complete_content:

surfsense_backend/app/agents/researcher/qna_agent/nodes.py

@@ -3,6 +3,7 @@ from typing import Any
 
 from langchain_core.messages import HumanMessage, SystemMessage
 from langchain_core.runnables import RunnableConfig
+from langgraph.types import StreamWriter
 from sqlalchemy import select
 
 from app.db import SearchSpace
@@ -129,9 +130,11 @@ async def rerank_documents(state: State, config: RunnableConfig) -> dict[str, An
         return {"reranked_documents": documents}
 
 
-async def answer_question(state: State, config: RunnableConfig) -> dict[str, Any]:
+async def answer_question(
+    state: State, config: RunnableConfig, writer: StreamWriter
+) -> dict[str, Any]:
     """
-    Answer the user's question using the provided documents.
+    Answer the user's question using the provided documents with real-time streaming.
 
     This node takes the relevant documents provided in the configuration and uses
     an LLM to generate a comprehensive answer to the user's question with
@@ -139,6 +142,8 @@ async def answer_question(state: State, config: RunnableConfig) -> dict[str, Any
     documents. If no documents are provided, it will use chat history to generate
     an answer.
 
+    The response is streamed token-by-token for real-time updates to the frontend.
+
     Returns:
         Dict containing the final answer in the "final_answer" key.
     """
@@ -151,6 +156,9 @@ async def answer_question(state: State, config: RunnableConfig) -> dict[str, Any
     search_space_id = configuration.search_space_id
     language = configuration.language
 
+    # Get streaming service from state
+    streaming_service = state.streaming_service
+
     # Fetch search space to get QnA configuration
     result = await state.db_session.execute(
         select(SearchSpace).where(SearchSpace.id == search_space_id)
@@ -279,8 +287,17 @@ async def answer_question(state: State, config: RunnableConfig) -> dict[str, Any
     total_tokens = calculate_token_count(messages_with_chat_history, llm.model)
     print(f"Final token count: {total_tokens}")
 
-    # Call the LLM and get the response
-    response = await llm.ainvoke(messages_with_chat_history)
-    final_answer = response.content
+    # Stream the LLM response token by token
+    final_answer = ""
+
+    async for chunk in llm.astream(messages_with_chat_history):
+        # Extract the content from the chunk
+        if hasattr(chunk, "content") and chunk.content:
+            token = chunk.content
+            final_answer += token
+
+            # Stream the token to the frontend via custom stream
+            if streaming_service:
+                writer({"yield_value": streaming_service.format_text_chunk(token)})
 
     return {"final_answer": final_answer}

surfsense_backend/app/agents/researcher/qna_agent/state.py

@@ -7,6 +7,8 @@ from typing import Any
 
 from sqlalchemy.ext.asyncio import AsyncSession
 
+from app.services.streaming_service import StreamingService
+
 
 @dataclass
 class State:
@@ -21,6 +23,9 @@ class State:
     # Runtime context
     db_session: AsyncSession
 
+    # Streaming service for real-time token streaming
+    streaming_service: StreamingService | None = None
+
     chat_history: list[Any] | None = field(default_factory=list)
     # OUTPUT: Populated by agent nodes
     reranked_documents: list[Any] | None = None

surfsense_backend/app/tasks/celery_tasks/document_tasks.py

@@ -62,7 +62,7 @@ async def _process_extension_document(
     individual_document_dict, search_space_id: int, user_id: str
 ):
     """Process extension document with new session."""
-    from pydantic import BaseModel
+    from pydantic import BaseModel, ConfigDict, Field
 
     # Reconstruct the document object from dict
     # You'll need to define the proper model for this
@@ -75,8 +75,9 @@ async def _process_extension_document(
         VisitedWebPageVisitDurationInMilliseconds: str
 
     class IndividualDocument(BaseModel):
+        model_config = ConfigDict(populate_by_name=True)
         metadata: DocumentMetadata
-        pageContent: str
+        page_content: str = Field(alias="pageContent")
 
     individual_document = IndividualDocument(**individual_document_dict)
 

surfsense_web/app/dashboard/[search_space_id]/researcher/[[...chat_id]]/page.tsx

@@ -17,13 +17,14 @@ export default function ResearcherPage() {
 	const { search_space_id } = useParams();
 	const router = useRouter();
 	const hasSetInitialConnectors = useRef(false);
+	const hasInitiatedResponse = useRef<string | null>(null);
 	const activeChatId = useAtomValue(activeChatIdAtom);
 	const { data: activeChatState, isFetching: isChatLoading } = useAtomValue(activeChatAtom);
 	const { mutateAsync: createChat } = useAtomValue(createChatMutationAtom);
 	const { mutateAsync: updateChat } = useAtomValue(updateChatMutationAtom);
 	const isNewChat = !activeChatId;
 
-	// Reset the flag when chat ID changes
+	// Reset the flag when chat ID changes (but not hasInitiatedResponse - we need to remember if we already initiated)
 	useEffect(() => {
 		hasSetInitialConnectors.current = false;
 	}, [activeChatId]);
@@ -167,10 +168,14 @@ export default function ResearcherPage() {
 			if (chatData.messages && Array.isArray(chatData.messages)) {
 				if (chatData.messages.length === 1 && chatData.messages[0].role === "user") {
 					// Single user message - append to trigger LLM response
-					handler.append({
-						role: "user",
-						content: chatData.messages[0].content,
-					});
+					// Only if we haven't already initiated for this chat and handler doesn't have messages yet
+					if (hasInitiatedResponse.current !== activeChatId && handler.messages.length === 0) {
+						hasInitiatedResponse.current = activeChatId;
+						handler.append({
+							role: "user",
+							content: chatData.messages[0].content,
+						});
+					}
 				} else if (chatData.messages.length > 1) {
 					// Multiple messages - set them all
 					handler.setMessages(chatData.messages);

surfsense_web/hooks/use-api-key.ts

@@ -48,7 +48,7 @@ export function useApiKey(): UseApiKeyReturn {
 		textArea.select();
 
 		try {
-			const successful = document.execCommand('copy');
+			const successful = document.execCommand("copy");
 			document.body.removeChild(textArea);
 
 			if (successful) {