dschlueter/my_voice_assistant_v2
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feat: Resilienz (Fallback-Ketten) und Metriken (#5)

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- Fallback-Provider (app/providers/fallback.py) fuer STT/LLM/TTS: Provider-Kette
  der Reihe nach; Config *_FALLBACK; build_orchestrator baut Ketten (dedupliziert)
- LLM-Stream-Fallback nur solange kein Token gesendet wurde
- Metriken (app/metrics.py): In-Memory Counter/Timer, keine externe Dependency
- HTTP-Middleware (Requests/Latenz/Status je Pfad); Pipeline-Stufen-Timing stt/llm/tts;
  Fallback-/Fehlerzaehler; GET /api/metrics (JSON + Prometheus)
- Tests: 58 gruen (+6); Doku aktualisiert (README, BEDIENUNGSANLEITUNG, Architektur, .env.example)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Dieter Schlüter 2026-06-17 05:19:07 +02:00
commit 6422444017
13 changed files with 452 additions and 23 deletions
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32
app/dependencies.py
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@ -19,6 +19,11 @@ from app.providers.llm.openrouter import OpenRouterLLMProvider
from app.providers.tts.openrouter import OpenRouterTTSProvider
from app.providers.tts.chatterbox import ChatterboxTTSProvider
from app.providers.tts.piper import PiperTTSProvider
from app.providers.fallback import (
FallbackSTTProvider,
FallbackLLMProvider,
FallbackTTSProvider,
)
from app.pipeline.input_cleaner import InputCleaner
from app.pipeline.spoken_response_adapter import SpokenResponseAdapter
from app.pipeline.tts_normalizer import TTSNormalizer
@ -198,11 +203,32 @@ def resolve_route(
return ResolvedRoute(**resolved)
_FALLBACK_CLASS = {
"stt": FallbackSTTProvider,
"llm": FallbackLLMProvider,
"tts": FallbackTTSProvider,
}
def _provider_chain(registry, primary: str, fallback_csv: str, module: str, cfg: Settings):
"""Baut primaeren Provider + optionale Fallback-Kette (dedupliziert, Reihenfolge erhalten)."""
names = [primary] + [n.strip() for n in (fallback_csv or "").split(",") if n.strip()]
seen, ordered = set(), []
for name in names:
if name not in seen:
seen.add(name)
ordered.append(name)
entries = [(name, _from_registry(registry, name, module.upper(), cfg)) for name in ordered]
if len(entries) == 1:
return entries[0][1]
return _FALLBACK_CLASS[module](module, entries)
def build_orchestrator(route: ResolvedRoute, cfg: Settings = settings) -> Orchestrator:
return Orchestrator(
stt=get_stt_provider(route.stt_provider, cfg),
llm=get_llm_provider(route.llm_provider, cfg),
tts=get_tts_provider(route.tts_provider, cfg),
stt=_provider_chain(STT_REGISTRY, route.stt_provider, cfg.stt_fallback, "stt", cfg),
llm=_provider_chain(LLM_REGISTRY, route.llm_provider, cfg.llm_fallback, "llm", cfg),
tts=_provider_chain(TTS_REGISTRY, route.tts_provider, cfg.tts_fallback, "tts", cfg),
input_cleaner=InputCleaner(),
spoken_adapter=SpokenResponseAdapter(),
tts_normalizer=TTSNormalizer(),