Hermes-agent

agent/tts_registry.py

@@ -0,0 +1,133 @@
+"""
+TTS Provider Registry
+=====================
+
+Central map of registered TTS providers. Populated by plugins at
+import-time via :meth:`PluginContext.register_tts_provider`; consumed
+by :mod:`tools.tts_tool` to dispatch ``text_to_speech`` tool calls to
+the active plugin backend **when** the configured ``tts.provider``
+name is neither a built-in nor a command-type provider.
+
+Built-ins-always-win
+--------------------
+Plugin names that collide with a built-in TTS provider (``edge``,
+``openai``, ``elevenlabs``, ``minimax``, ``gemini``, ``mistral``,
+``xai``, ``piper``, ``kittentts``, ``neutts``) are rejected at
+registration with a warning. This invariant is also re-checked at
+dispatch time in :func:`tools.tts_tool._dispatch_to_plugin_provider`.
+
+Command-providers-win-over-plugins
+----------------------------------
+This registry doesn't enforce the command-vs-plugin precedence — that
+lives in the dispatcher, which checks for a same-name
+``tts.providers.<name>: type: command`` entry before consulting the
+registry. The rationale is locality: a name declared in the user's
+``config.yaml`` is more specific to their setup than a plugin that
+happens to be installed.
+"""
+
+from __future__ import annotations
+
+import logging
+import threading
+from typing import Dict, List, Optional
+
+from agent.tts_provider import TTSProvider
+
+logger = logging.getLogger(__name__)
+
+
+# Names reserved for native built-in TTS handlers. Plugins cannot
+# register a name in this set — the registration call is rejected with
+# a warning. **Kept in sync with ``BUILTIN_TTS_PROVIDERS`` in
+# :mod:`tools.tts_tool`** — a regression test in
+# ``tests/agent/test_tts_registry.py::TestBuiltinSync`` fails if the
+# two lists drift. Importing from ``tools.tts_tool`` directly would
+# create a circular dependency (``tools.tts_tool`` imports
+# ``agent.tts_registry`` for dispatch).
+_BUILTIN_NAMES = frozenset({
+    "edge",
+    "elevenlabs",
+    "openai",
+    "minimax",
+    "xai",
+    "mistral",
+    "gemini",
+    "neutts",
+    "kittentts",
+    "piper",
+})
+
+
+_providers: Dict[str, TTSProvider] = {}
+_lock = threading.Lock()
+
+
+def register_provider(provider: TTSProvider) -> None:
+    """Register a TTS provider.
+
+    Rejects:
+
+    - Non-:class:`TTSProvider` instances (raises :class:`TypeError`).
+    - Empty/whitespace ``.name`` (raises :class:`ValueError`).
+    - Names colliding with a built-in (logs a warning, silently
+      ignores — built-ins-always-win invariant).
+
+    Re-registration (same ``name``) overwrites the previous entry and
+    logs a debug message — makes hot-reload scenarios (tests, dev
+    loops) behave predictably.
+    """
+    if not isinstance(provider, TTSProvider):
+        raise TypeError(
+            f"register_provider() expects a TTSProvider instance, "
+            f"got {type(provider).__name__}"
+        )
+    name = provider.name
+    if not isinstance(name, str) or not name.strip():
+        raise ValueError("TTS provider .name must be a non-empty string")
+    key = name.strip().lower()
+    if key in _BUILTIN_NAMES:
+        logger.warning(
+            "TTS provider '%s' shadows a built-in name; registration ignored. "
+            "Built-in TTS providers (%s) always win — pick a different name.",
+            key, ", ".join(sorted(_BUILTIN_NAMES)),
+        )
+        return
+    with _lock:
+        existing = _providers.get(key)
+        _providers[key] = provider
+    if existing is not None:
+        logger.debug(
+            "TTS provider '%s' re-registered (was %r)",
+            key, type(existing).__name__,
+        )
+    else:
+        logger.debug(
+            "Registered TTS provider '%s' (%s)",
+            key, type(provider).__name__,
+        )
+
+
+def list_providers() -> List[TTSProvider]:
+    """Return all registered providers, sorted by name."""
+    with _lock:
+        items = list(_providers.values())
+    return sorted(items, key=lambda p: p.name)
+
+
+def get_provider(name: str) -> Optional[TTSProvider]:
+    """Return the provider registered under *name*, or None.
+
+    Name matching is case-insensitive and whitespace-tolerant — mirrors
+    how ``tools.tts_tool._get_provider`` normalizes the configured
+    ``tts.provider`` value.
+    """
+    if not isinstance(name, str):
+        return None
+    return _providers.get(name.strip().lower())
+
+
+def _reset_for_tests() -> None:
+    """Clear the registry. **Test-only.**"""
+    with _lock:
+        _providers.clear()