fixed basic issues in async run_graph

backend/onyx/agent_search/run_graph.py

@@ -3,12 +3,13 @@
 from collections.abc import Iterable
 
 from langchain_core.runnables.schema import StreamEvent
-from langgraph.graph import StateGraph
+from langgraph.graph.state import CompiledStateGraph
 
 from onyx.agent_search.main.graph_builder import main_graph_builder
 from onyx.agent_search.main.states import MainInput
 from onyx.chat.answer import AnswerStream
 from onyx.chat.models import AnswerQuestionPossibleReturn
+from onyx.chat.models import OnyxAnswerPiece
 from onyx.context.search.models import SearchRequest
 from onyx.db.engine import get_session_context_manager
 from onyx.llm.interfaces import LLM
@@ -28,17 +29,16 @@ def _parse_agent_event(
         return ToolCallKickoff(**event["data"])
     elif event_type == "tool_response":
         return ToolResponse(**event["data"])
-    elif event_type == "answer_question_possible":
-        return AnswerQuestionPossibleReturn(**event["data"])
+    elif event_type == "on_chat_model_stream":
+        return OnyxAnswerPiece(answer_piece=event["data"]["chunk"].content)
     return None
 
 
 def _manage_async_event_streaming(
-    graph: StateGraph,
+    compiled_graph: CompiledStateGraph,
     graph_input: MainInput,
 ) -> Iterable[StreamEvent]:
     async def _run_async_event_stream() -> AsyncIterable[StreamEvent]:
-        compiled_graph = graph.compile()
         async for event in compiled_graph.astream_events(
             input=graph_input,
             # indicating v2 here deserves further scrutiny
@@ -70,22 +70,20 @@ def _yield_async_to_sync() -> Iterable[StreamEvent]:
 
 
 def run_graph(
+    compiled_graph: CompiledStateGraph,
     search_request: SearchRequest,
     primary_llm: LLM,
     fast_llm: LLM,
 ) -> AnswerStream:
-    graph = main_graph_builder()
-
     with get_session_context_manager() as db_session:
         input = MainInput(
             search_request=search_request,
             primary_llm=primary_llm,
             fast_llm=fast_llm,
             db_session=db_session,
         )
-        compiled_graph = graph.compile()
         for event in _manage_async_event_streaming(
-            graph=compiled_graph, graph_input=input
+            compiled_graph=compiled_graph, graph_input=input
         ):
             if parsed_object := _parse_agent_event(event):
                 yield parsed_object
@@ -101,5 +99,5 @@ def run_graph(
     search_request = SearchRequest(
         query="what can you do with onyx or danswer?",
     )
-    for output in run_graph(search_request, primary_llm, fast_llm):
+    for output in run_graph(compiled_graph, search_request, primary_llm, fast_llm):
         print(output)