[WIP] AWS Nova Sonic service - Protect against back-to-back BotStoppedSpeaking calls, which I've observed

src/pipecat/services/aws_nova_sonic/aws.py

@@ -145,6 +145,8 @@ class AWSNovaSonicLLMService(LLMService):
         self._assistant_is_responding = False
         self._context_available = False
         self._ready_to_send_context = False
+        self._handling_bot_stopped_speaking = False
+
 
     #
     # standard AIService frame handling
@@ -211,6 +213,11 @@ class AWSNovaSonicLLMService(LLMService):
             await self._finish_connecting_if_context_available()
 
     async def _handle_bot_stopped_speaking(self):
+        # Protect against back-to-back BotStoppedSpeaking calls, which I've observed
+        if self._handling_bot_stopped_speaking:
+            return
+        self._handling_bot_stopped_speaking = True
+
         if self._assistant_is_responding:
             # Consider the assistant finished with their response (after a short delay, to allow for
             # any FINAL text block to come in).
@@ -229,6 +236,9 @@ class AWSNovaSonicLLMService(LLMService):
             await asyncio.sleep(0.25)
             self._assistant_is_responding = False
             await self._report_assistant_response_ended()
+            self._handling_bot_stopped_speaking = False
+
+        self._handling_bot_stopped_speaking = False
 
     async def _handle_function_call_result(self, frame: AWSNovaSonicFunctionCallResultFrame):
         result = frame.result_frame