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fix(deepgram): send CloseStream message before closing TTS WebSocket #3608

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Merged
merged 3 commits into from
Oct 12, 2025
Merged

fix(deepgram): send CloseStream message before closing TTS WebSocket #3608

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fix(deepgram): send CloseStream message before closing TTS WebSocket
Nisarg38 Oct 8, 2025
735edc4
Formatting Fix
Nisarg38 Oct 8, 2025
d67d9e2
Changes:
Nisarg38 Oct 9, 2025
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20 changes: 19 additions & 1 deletion livekit-plugins/livekit-plugins-deepgram/livekit/plugins/deepgram/tts.py
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Original file line number Diff line number Diff line change
Expand Up @@ -125,7 +125,22 @@ async def _connect_ws(self, timeout: float) -> aiohttp.ClientWebSocketResponse:
)

async def _close_ws(self, ws: aiohttp.ClientWebSocketResponse) -> None:
await ws.close()
try:
# Send Flush and Close messages to ensure Deepgram processes all remaining audio
# and properly terminates the session, preventing lingering TTS sessions
await ws.send_str(SynthesizeStream._FLUSH_MSG)
await ws.send_str(SynthesizeStream._CLOSE_MSG)

# Wait for server acknowledgment to prevent race conditions and ensure
# proper cleanup, avoiding 429 Too Many Requests errors from lingering sessions
try:
await asyncio.wait_for(ws.receive(), timeout=1.0)
except asyncio.TimeoutError:
pass
except Exception as e:
logger.warning(f"Error during WebSocket close sequence: {e}")
finally:
await ws.close()

def _ensure_session(self) -> aiohttp.ClientSession:
if not self._session:
Expand Down Expand Up @@ -220,6 +235,9 @@ async def _run(self, output_emitter: tts.AudioEmitter) -> None:


class SynthesizeStream(tts.SynthesizeStream):
_FLUSH_MSG: str = json.dumps({"type": "Flush"})
_CLOSE_MSG: str = json.dumps({"type": "Close"})

def __init__(self, *, tts: TTS, conn_options: APIConnectOptions):
super().__init__(tts=tts, conn_options=conn_options)
self._tts: TTS = tts
Expand Down