Robert Helewka
4048ce1db6
Engine mode is now explicit: USE_MOCK_SIP=true is the only way to get the mock engine; an unconfigured trunk fails startup with guidance instead of silently degrading. Root-caused why the engine always ran mock: nested pydantic-settings never read .env (no env_file on the sub-settings classes) — all 8 now declare it. /health stops lying: reports engine mode (sippy|mock), a live DB SELECT 1, trunk registration state with reason, and TTS/STT availability from their last real request; "healthy" now requires ready + db + sippy + registered trunk. Error policy: leaf services (tts/transcription/llm_client) raise and track availability; call-loop callers catch, publish EventType.ERROR naming the failed service, and apply an explicit fallback. Persistence writes get one bounded 3x exponential retry, then an ERROR log — no more silent data loss. Event bus: a full subscriber queue drops its oldest event (counted) instead of silently evicting the subscription; subscribe(replay_last=N) delivers the advertised history replay, used by /ws/events (25). Receptionist correctness: a matched TAKE_MESSAGE rule beats the LLM; voicemail polls for early hangup and stops/transcribes/hangs up in finally; RecordingSession finally keeps its leg_ids so taps detach. Dead code removed: models/contact.py + Contact table, dtmf_buffer, transcribe_stream stub, SMS stub in notification.py. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
91 lines
2.9 KiB
Python
91 lines
2.9 KiB
Python
"""
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TTS Service — Rhema (OpenAI-compatible) text-to-speech client.
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Synthesizes speech for the SPEAK call-flow step and the AI Receptionist.
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Rhema exposes POST /v1/audio/speech (OpenAI-compatible) with Kokoro voices.
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"""
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import logging
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from pathlib import Path
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from typing import Optional
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import httpx
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from config import TTSSettings
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logger = logging.getLogger(__name__)
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class TTSService:
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"""Client for Rhema TTS service."""
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def __init__(self, settings: TTSSettings):
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self.settings = settings
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self._client: Optional[httpx.AsyncClient] = None
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# Last-known reachability, surfaced by /health (None = no requests yet)
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self.available: Optional[bool] = None
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async def _get_client(self) -> httpx.AsyncClient:
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if self._client is None or self._client.is_closed:
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headers = {}
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if self.settings.api_key.get_secret_value():
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headers["Authorization"] = f"Bearer {self.settings.api_key.get_secret_value()}"
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self._client = httpx.AsyncClient(
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base_url=self.settings.base_url,
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timeout=httpx.Timeout(self.settings.timeout, connect=5.0),
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headers=headers,
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)
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return self._client
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async def synthesize(
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self,
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text: str,
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voice: Optional[str] = None,
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response_format: str = "wav",
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) -> bytes:
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"""Synthesize speech and return audio bytes."""
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if not text or not text.strip():
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return b""
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client = await self._get_client()
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body = {
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"model": self.settings.model,
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"input": text,
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"voice": voice or self.settings.voice,
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"response_format": response_format,
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"sample_rate": self.settings.sample_rate,
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}
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# Raises on failure — callers decide the per-call fallback and
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# publish a service-error event; swallowing here made a down
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# Rhema look like "the AI went quiet".
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try:
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response = await client.post("/v1/audio/speech", json=body)
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response.raise_for_status()
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except Exception:
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self.available = False
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raise
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self.available = True
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return response.content
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async def synthesize_to_file(
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self,
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text: str,
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filepath: str | Path,
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voice: Optional[str] = None,
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) -> bool:
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"""Synthesize to a WAV file. Returns True on success."""
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audio = await self.synthesize(text, voice=voice, response_format="wav")
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if not audio:
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return False
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path = Path(filepath)
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path.parent.mkdir(parents=True, exist_ok=True)
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path.write_bytes(audio)
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logger.debug(f"TTS wrote {len(audio)} bytes to {path}")
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return True
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async def close(self) -> None:
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if self._client and not self._client.is_closed:
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await self._client.aclose()
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self._client = None
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