171 lines
7.9 KiB
Python
171 lines
7.9 KiB
Python
"""Local-engine lifecycle for ``tools.tts_tool``: warm-up / release leases.
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Local engines load lazily on first synthesis (dead air on the first spoken reply) and then stay
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resident. Every surface that flips speech output on holds a *lease* here (warming the configured
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engine); when the last lease is released the local model caches are dropped, so one surface's
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"off" can't unload a model another surface still needs. Cloud providers have nothing resident;
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warming only ensures the SDK imports. Origin seams (``_load_tts_config``, ``_get_provider``) are
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resolved through :func:`_origin` per call.
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"""
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from __future__ import annotations
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import logging
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import threading
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import time
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from typing import Any, Callable, Dict, List, Optional
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from tools import tts_command_provider
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from tools.tts_command_provider import (
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BUILTIN_TTS_PROVIDERS, _get_command_tts_timeout, _get_named_provider_config,
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_is_command_provider_config, command_env_passthrough as _command_provider_env_passthrough,
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render_command_template as _render_command_tts_template)
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from tools.tts_tool_delivery import _origin
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from tools.tts_tool_local import (
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_LOCAL_TTS_MODEL_CACHES, _load_kittentts_model_for_config, _load_piper_voice_for_config)
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from tools.tts_tool_plugins import _lookup_plugin_provider
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logger = logging.getLogger("tools.tts_tool")
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_tts_lease_lock = threading.Lock()
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_tts_leases: set = set()
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def _local_tts_warmers() -> Dict[str, Callable[[Dict[str, Any]], Any]]:
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"""Provider name → loader populating that engine's cache slot (same key synthesis uses)."""
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return {
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"piper": lambda cfg: _load_piper_voice_for_config(cfg)[0],
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"kittentts": lambda cfg: _load_kittentts_model_for_config(cfg)[0]}
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# tools.lazy_deps feature key for providers whose SDK installs on first use.
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_LAZY_SDK_FEATURES = {"edge": "tts.edge", "elevenlabs": "tts.elevenlabs", "mistral": "tts.mistral"}
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def _signal_user_tts_provider(name: str, tts_config: Dict[str, Any], hook: str) -> Optional[str]:
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"""Forward a lease ``hook`` (``"warm"``/``"release"``) to a user-declared provider; returns the action.
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Command providers run their optional ``<hook>_command`` (same template/env/timeout rules as
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``command``) on a background thread so a toggle never waits on a model server; plugins get
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:meth:`TTSProvider.warm`/``release``. Best-effort: failures are logged at debug."""
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if not name or name in BUILTIN_TTS_PROVIDERS:
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return None
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cfg = _get_named_provider_config(tts_config, name)
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try:
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if _is_command_provider_config(cfg):
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template = str(cfg.get(f"{hook}_command") or "").strip()
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if not template:
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return None
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command = _render_command_tts_template(template, {
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"voice": str(cfg.get("voice", "")),
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"model": str(cfg.get("model", "")),
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"speed": str(cfg.get("speed", tts_config.get("speed", "")))})
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def _run() -> None:
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try:
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tts_command_provider.run_command_provider(
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command, _get_command_tts_timeout(cfg),
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env_passthrough=_command_provider_env_passthrough(cfg))
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except Exception as exc: # noqa: BLE001 — best-effort hook
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logger.debug("[TTS] %s_command for %s failed: %s", hook, name, exc)
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threading.Thread(target=_run, name=f"tts-{hook}-{name}", daemon=True).start()
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return hook
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plugin_provider = _lookup_plugin_provider(name)
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if plugin_provider is None:
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return None
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getattr(plugin_provider, hook)()
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return hook
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except Exception as exc: # noqa: BLE001 — best-effort hook
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logger.debug("[TTS] %s hook for %s failed: %s", hook, name, exc)
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return "error"
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def warm_tts_provider(tts_config: Optional[Dict[str, Any]] = None, provider: Optional[str] = None) -> Dict[str, Any]:
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"""Pre-load the configured TTS provider so the next synthesis starts hot (blocking; never raises).
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Local engines fill the same LRU slot synthesis reads (including first-use download); lazily
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installed cloud SDKs are made importable; user-declared providers get their warm hook;
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everything else is ``action: "noop"``. The result carries ``warmed`` / ``action`` / ``error``."""
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if tts_config is None:
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tts_config = _origin()._load_tts_config()
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name = (provider or _origin()._get_provider(tts_config) or "").lower().strip()
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result: Dict[str, Any] = {"provider": name, "warmed": False, "action": "noop"}
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warmer = _local_tts_warmers().get(name)
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if warmer is not None:
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cache = _LOCAL_TTS_MODEL_CACHES.get(name, {})
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before, started = len(cache), time.monotonic()
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try:
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warmer(tts_config)
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except Exception as exc: # engine missing, download failed, bad voice…
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logger.warning("[TTS] warm-up for %s failed: %s", name, exc)
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result.update(action="error", error=str(exc))
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return result
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result.update(
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warmed=True, action="loaded" if len(cache) > before else "cached",
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elapsed_ms=int((time.monotonic() - started) * 1000))
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logger.info("[TTS] warm-up %s: %s in %dms", name, result["action"], result["elapsed_ms"])
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return result
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signalled = _signal_user_tts_provider(name, tts_config, "warm")
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if signalled is not None:
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ok = signalled != "error"
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result.update(warmed=ok, action="warmed" if ok else "error")
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return result
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feature = _LAZY_SDK_FEATURES.get(name)
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if feature is not None:
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try:
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from tools.lazy_deps import ensure, is_available
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if is_available(feature):
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result.update(warmed=True, action="cached")
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else:
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ensure(feature, prompt=False)
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result.update(warmed=True, action="installed")
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except Exception as exc:
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logger.debug("[TTS] SDK warm-up for %s skipped: %s", name, exc)
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result.update(action="error", error=str(exc))
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return result
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def release_tts_provider(provider: Optional[str] = None) -> Dict[str, Any]:
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"""Drop resident local models -> ``{"released": <count>}``. With ``provider`` only that engine's
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cache is cleared; otherwise every cache is, and the configured user provider is signalled."""
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name = (provider or "").lower().strip()
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if not name:
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tts_config = _origin()._load_tts_config()
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_signal_user_tts_provider(_origin()._get_provider(tts_config), tts_config, "release")
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released = 0
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for cache_name, cache in _LOCAL_TTS_MODEL_CACHES.items():
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if not name or cache_name == name:
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released += len(cache)
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cache.clear()
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if released:
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logger.info("[TTS] released %d resident local model(s)", released)
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return {"released": released}
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def acquire_tts_lease(lease: str, tts_config: Optional[Dict[str, Any]] = None) -> Dict[str, Any]:
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"""Register ``lease`` (e.g. ``"desktop:read-aloud"``) and warm the provider. Re-acquiring is
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idempotent but still re-warms (cheap on a cache hit; heals a cache cleared elsewhere)."""
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with _tts_lease_lock:
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_tts_leases.add(lease)
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holders = len(_tts_leases)
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return {**warm_tts_provider(tts_config), "leases": holders}
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def release_tts_lease(lease: str) -> Dict[str, Any]:
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"""Drop ``lease``; the last one out unloads resident local models. A never-acquired lease is a
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no-op (still reports the holder count) so surfaces can call this unconditionally."""
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with _tts_lease_lock:
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_tts_leases.discard(lease)
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holders = len(_tts_leases)
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released = release_tts_provider()["released"] if holders == 0 else 0
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return {"leases": holders, "released": released}
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def tts_lease_holders() -> List[str]:
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"""Snapshot of live lease names (diagnostics / tests)."""
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with _tts_lease_lock:
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return sorted(_tts_leases)
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def _reset_tts_leases_for_tests() -> None:
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with _tts_lease_lock:
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_tts_leases.clear()
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