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from __future__ import annotations
import json
from uuid import uuid4
from fastapi import APIRouter, WebSocket, WebSocketDisconnect
from starlette.websockets import WebSocketDisconnected
from sonicagent_rt.audio.pcm import pcm16_to_floats
from sonicagent_rt.auth.service_token import enforce_origin
from sonicagent_rt.observability.stt_metrics import REALTIME_INFLIGHT, observe_realtime_turn
from sonicagent_rt.pipeline.cancellation import CancellationToken
from sonicagent_rt.pipeline.orchestrator import run_turn
from sonicagent_rt.protocol.binary_frame import BinaryFrameError, decode_frame
from sonicagent_rt.protocol.constants import FLAG_END_OF_UTTERANCE, MessageType
from sonicagent_rt.protocol.sequence import SequenceError, SequenceValidator
from sonicagent_rt.stt.errors import SpeechError
from sonicagent_rt.vad.factory import create_endpoint, vad_backend
router = APIRouter()
_MAX_FRAME_BYTES = 64 * 1024
@router.websocket("/realtime/{session_id}")
async def realtime(websocket: WebSocket, session_id: str) -> None:
settings = websocket.app.state.settings
token = websocket.query_params.get("resume_token", "")
try:
if not settings.voice_enabled:
raise SpeechError("voice endpoints are disabled")
enforce_origin(websocket.headers.get("origin"), settings)
session, resumed = websocket.app.state.sessions.acquire(session_id, token)
except SpeechError:
await websocket.close(code=1008)
return
await websocket.accept()
hello = "session.updated" if resumed else "session.created"
await websocket.send_json(
{
"type": hello,
"session_id": session.session_id,
"status": "ready",
"vad": vad_backend(settings),
"resumed": resumed,
}
)
endpoint = create_endpoint(settings)
sequences = SequenceValidator()
turn: object | None = None
cancellation: CancellationToken | None = None
async def cancel_turn(reason: str) -> None:
nonlocal cancellation
if cancellation is not None and not cancellation.cancelled:
cancellation.cancel()
return
await websocket.send_json({"type": "response.cancelled", "reason": reason})
async def start_turn(samples: list[float]) -> None:
nonlocal turn, cancellation
if cancellation is not None:
cancellation.cancel()
cancellation = CancellationToken()
token_box = cancellation
turn_id = f"turn_{uuid4().hex}"
async def pump() -> None:
queued_ms = 0
recorded = False
REALTIME_INFLIGHT.inc()
try:
async for item in run_turn(
samples=samples,
sample_rate=settings.input_sample_rate,
language=session.language,
voice_id=session.voice_id,
stt=websocket.app.state.stt,
llm=websocket.app.state.llm,
tts=websocket.app.state.tts,
settings=settings,
cancellation=token_box,
turn_id=turn_id,
speech_ms=len(samples) * 1000 / settings.input_sample_rate,
):
if token_box.cancelled and not isinstance(item, dict):
break
terminal = {"metrics.turn", "response.cancelled", "error"}
if isinstance(item, dict) and not recorded and item.get("type") in terminal:
recorded = True
kind = item.get("type")
result = {"metrics.turn": "ok", "response.cancelled": "cancelled"}.get(str(kind), "error")
observe_realtime_turn(result, item)
if isinstance(item, bytes):
queued_ms += settings.audio_frame_ms
if queued_ms > settings.max_outbound_queue_ms:
token_box.cancel()
await websocket.send_json(
{
"type": "error",
"turn_id": turn_id,
"code": "rate_limited",
"message": "outbound audio queue is full",
}
)
break
await websocket.send_bytes(item)
else:
await websocket.send_json(item)
except Exception:
if not recorded:
observe_realtime_turn("error", {})
await websocket.send_json(
{"type": "error", "turn_id": turn_id, "code": "inference_failed", "message": "turn failed"}
)
finally:
REALTIME_INFLIGHT.dec()
import asyncio
turn = asyncio.create_task(pump())
try:
while True:
message = await websocket.receive()
if message.get("text"):
await _on_text(websocket, message["text"], cancel_turn)
elif message.get("bytes") is not None:
payload = message["bytes"]
if len(payload) > _MAX_FRAME_BYTES:
await websocket.send_json(
{"type": "error", "code": "audio_too_large", "message": "audio frame is too large"}
)
continue
try:
frame = decode_frame(payload)
if frame.message_type != int(MessageType.AUDIO_INPUT):
raise BinaryFrameError("client frames must be microphone audio")
sequences.accept(frame.sequence)
samples = pcm16_to_floats(frame.payload)
except (BinaryFrameError, SequenceError, ValueError) as exc:
await websocket.send_json({"type": "error", "code": "invalid_audio", "message": str(exc)})
continue
if (
settings.barge_in_enabled
and turn is not None
and not turn.done()
and _rms(samples) >= settings.vad_threshold
):
await cancel_turn("barge-in")
for event in endpoint.push(samples):
if event.kind == "started":
await websocket.send_json({"type": "speech.started"})
elif event.kind == "utterance":
await websocket.send_json({"type": "speech.stopped"})
await start_turn(event.samples)
if frame.flags & FLAG_END_OF_UTTERANCE:
for event in endpoint.flush():
if event.kind == "utterance":
await websocket.send_json({"type": "speech.stopped"})
await start_turn(event.samples)
except (WebSocketDisconnect, WebSocketDisconnected):
if cancellation is not None:
cancellation.cancel()
finally:
websocket.app.state.sessions.release(session_id)
async def _on_text(websocket: WebSocket, raw: str, cancel_turn) -> None:
try:
event = json.loads(raw)
except json.JSONDecodeError:
await websocket.send_json({"type": "error", "code": "invalid_request", "message": "control event is not JSON"})
return
kind = event.get("type")
if kind == "ping":
await websocket.send_json({"type": "pong"})
elif kind == "response.cancel":
await cancel_turn("client")
elif kind == "call.end":
await websocket.close(code=1000)
else:
await websocket.send_json({"type": "error", "code": "invalid_request", "message": "unsupported control event"})
def _rms(samples: list[float]) -> float:
if not samples:
return 0.0
total = sum(sample * sample for sample in samples)
return (total / len(samples)) ** 0.5
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