extract calling completion hook to a method

Author: lmolkova

util/opentelemetry-util-genai/src/opentelemetry/util/genai/handler.py

@@ -215,6 +215,21 @@ def _record_embedding_metrics(
         # metric support is added.
         return
 
+    def _call_completion_hook(
+        self,
+        invocation: LLMInvocation,
+        span: Span,
+        log_record: object,
+    ) -> None:
+        if self._completion_hook is not None:
+            self._completion_hook.on_completion(
+                inputs=invocation.input_messages,
+                outputs=invocation.output_messages,
+                system_instruction=invocation.system_instruction,
+                span=span,
+                log_record=log_record,
+            )
+
     def _start(self, invocation: _T) -> _T:
         """Start a GenAI invocation and create a pending span entry."""
         if isinstance(invocation, LLMInvocation):
@@ -254,14 +269,7 @@ def _stop(self, invocation: _T) -> _T:
                 _apply_llm_finish_attributes(span, invocation)
                 self._record_llm_metrics(invocation, span)
                 log_record = _maybe_build_llm_event_record(span, invocation)
-                if self._completion_hook is not None:
-                    self._completion_hook.on_completion(
-                        inputs=invocation.input_messages,
-                        outputs=invocation.output_messages,
-                        system_instruction=invocation.system_instruction,
-                        span=span,
-                        log_record=log_record,
-                    )
+                self._call_completion_hook(invocation, span, log_record)
                 if log_record is not None:
                     self._logger.emit(log_record)
             elif isinstance(invocation, EmbeddingInvocation):