refactor: Rename long util function name in runner.py and move it to functions.py

PiperOrigin-RevId: 774880990

src/google/adk/flows/llm_flows/functions.py

@@ -519,3 +519,35 @@ def merge_parallel_function_response_events(
   # Use the base_event as the timestamp
   merged_event.timestamp = base_event.timestamp
   return merged_event
+
+
+def find_matching_function_call(
+    events: list[Event],
+) -> Optional[Event]:
+  """Finds the function call event that matches the function response id of the last event."""
+  if not events:
+    return None
+
+  last_event = events[-1]
+  if (
+      last_event.content
+      and last_event.content.parts
+      and any(part.function_response for part in last_event.content.parts)
+  ):
+
+    function_call_id = next(
+        part.function_response.id
+        for part in last_event.content.parts
+        if part.function_response
+    )
+    for i in range(len(events) - 2, -1, -1):
+      event = events[i]
+      # looking for the system long running request euc function call
+      function_calls = event.get_function_calls()
+      if not function_calls:
+        continue
+
+      for function_call in function_calls:
+        if function_call.id == function_call_id:
+          return event
+  return None

src/google/adk/runners.py

@@ -36,6 +36,7 @@ from .artifacts.in_memory_artifact_service import InMemoryArtifactService
 from .auth.credential_service.base_credential_service import BaseCredentialService
 from .code_executors.built_in_code_executor import BuiltInCodeExecutor
 from .events.event import Event
+from .flows.llm_flows.functions import find_matching_function_call
 from .memory.base_memory_service import BaseMemoryService
 from .memory.in_memory_memory_service import InMemoryMemoryService
 from .platform.thread import create_thread
@@ -354,9 +355,7 @@ class Runner:
     # the agent that returned the corressponding function call regardless the
     # type of the agent. e.g. a remote a2a agent may surface a credential
     # request as a special long running function tool call.
-    event = _find_function_call_event_if_last_event_is_function_response(
-        session
-    )
+    event = find_matching_function_call(session.events)
     if event and event.author:
       return root_agent.find_agent(event.author)
     for event in filter(lambda e: e.author != 'user', reversed(session.events)):
@@ -538,35 +537,3 @@ class InMemoryRunner(Runner):
         session_service=self._in_memory_session_service,
         memory_service=InMemoryMemoryService(),
     )
-
-
-def _find_function_call_event_if_last_event_is_function_response(
-    session: Session,
-) -> Optional[Event]:
-  events = session.events
-  if not events:
-    return None
-
-  last_event = events[-1]
-  if (
-      last_event.content
-      and last_event.content.parts
-      and any(part.function_response for part in last_event.content.parts)
-  ):
-
-    function_call_id = next(
-        part.function_response.id
-        for part in last_event.content.parts
-        if part.function_response
-    )
-    for i in range(len(events) - 2, -1, -1):
-      event = events[i]
-      # looking for the system long running request euc function call
-      function_calls = event.get_function_calls()
-      if not function_calls:
-        continue
-
-      for function_call in function_calls:
-        if function_call.id == function_call_id:
-          return event
-  return None