""" FILE: app/services/llm_service.py DESCRIPTION: Hybrid-Client für Ollama, Google GenAI (Gemini) und OpenRouter. Verwaltet provider-spezifische Prompts und Background-Last. WP-20: Optimiertes Fallback-Management zum Schutz von Cloud-Quoten. VERSION: 3.3.1 STATUS: Active """ import httpx import yaml import logging import asyncio import json from google import genai from google.genai import types from openai import AsyncOpenAI # Für OpenRouter (OpenAI-kompatibel) from pathlib import Path from typing import Optional, Dict, Any, Literal from app.config import get_settings logger = logging.getLogger(__name__) class LLMService: # GLOBALER SEMAPHOR für Hintergrund-Last Steuerung (WP-06) _background_semaphore = None def __init__(self): self.settings = get_settings() self.prompts = self._load_prompts() # Initialisiere Semaphore einmalig auf Klassen-Ebene if LLMService._background_semaphore is None: limit = getattr(self.settings, "BACKGROUND_LIMIT", 2) logger.info(f"🚦 LLMService: Initializing Background Semaphore with limit: {limit}") LLMService._background_semaphore = asyncio.Semaphore(limit) # 1. Lokaler Ollama Client self.ollama_client = httpx.AsyncClient( base_url=self.settings.OLLAMA_URL, timeout=httpx.Timeout(self.settings.LLM_TIMEOUT) ) # 2. Google GenAI Client (Modern SDK) self.google_client = None if self.settings.GOOGLE_API_KEY: self.google_client = genai.Client(api_key=self.settings.GOOGLE_API_KEY) logger.info("✨ LLMService: Google GenAI (Gemini) active.") # 3. OpenRouter Client self.openrouter_client = None if self.settings.OPENROUTER_API_KEY: self.openrouter_client = AsyncOpenAI( base_url="https://openrouter.ai/api/v1", api_key=self.settings.OPENROUTER_API_KEY ) logger.info("🛰️ LLMService: OpenRouter Integration active.") def _load_prompts(self) -> dict: """Lädt die Prompt-Konfiguration aus der YAML-Datei.""" path = Path(self.settings.PROMPTS_PATH) if not path.exists(): return {} try: with open(path, "r", encoding="utf-8") as f: return yaml.safe_load(f) or {} except Exception as e: logger.error(f"Failed to load prompts: {e}") return {} def get_prompt(self, key: str, provider: str = None) -> str: """ Hole provider-spezifisches Template mit intelligenter Text-Kaskade. HINWEIS: Dies ist nur ein Text-Lookup und verbraucht kein API-Kontingent. Kaskade: Gewählter Provider -> Gemini (Cloud-Stil) -> Ollama (Basis-Stil). """ active_provider = provider or self.settings.MINDNET_LLM_PROVIDER data = self.prompts.get(key, "") if isinstance(data, dict): # Wir versuchen erst den Provider, dann Gemini (weil ähnlich leistungsfähig), dann Ollama return data.get(active_provider, data.get("gemini", data.get("ollama", ""))) return str(data) async def generate_raw_response( self, prompt: str, system: str = None, force_json: bool = False, max_retries: int = 2, base_delay: float = 2.0, priority: Literal["realtime", "background"] = "realtime", provider: Optional[str] = None, model_override: Optional[str] = None ) -> str: """Haupteinstiegspunkt für LLM-Anfragen mit Priorisierung.""" target_provider = provider or self.settings.MINDNET_LLM_PROVIDER if priority == "background": async with LLMService._background_semaphore: return await self._dispatch(target_provider, prompt, system, force_json, max_retries, base_delay, model_override) return await self._dispatch(target_provider, prompt, system, force_json, max_retries, base_delay, model_override) async def _dispatch(self, provider, prompt, system, force_json, max_retries, base_delay, model_override): """Routet die Anfrage an den physikalischen API-Provider.""" try: if provider == "openrouter" and self.openrouter_client: return await self._execute_openrouter(prompt, system, force_json, model_override) if provider == "gemini" and self.google_client: return await self._execute_google(prompt, system, force_json, model_override) # Default/Fallback zu Ollama return await self._execute_ollama(prompt, system, force_json, max_retries, base_delay) except Exception as e: # QUOTEN-SCHUTZ: Wenn Cloud (OpenRouter/Gemini) fehlschlägt, # gehen wir IMMER zu Ollama, niemals von OpenRouter zu Gemini. if self.settings.LLM_FALLBACK_ENABLED and provider != "ollama": logger.warning(f"🔄 Provider {provider} failed: {e}. Falling back to LOCAL OLLAMA to protect cloud quotas.") return await self._execute_ollama(prompt, system, force_json, max_retries, base_delay) raise e async def _execute_google(self, prompt, system, force_json, model_override): """Native Google SDK Integration (Gemini).""" model = model_override or self.settings.GEMINI_MODEL config = types.GenerateContentConfig( system_instruction=system, response_mime_type="application/json" if force_json else "text/plain" ) # SDK Call in Thread auslagern, da die Google API blocking sein kann response = await asyncio.to_thread( self.google_client.models.generate_content, model=model, contents=prompt, config=config ) return response.text.strip() async def _execute_openrouter(self, prompt, system, force_json, model_override): """OpenRouter API Integration (OpenAI-kompatibel).""" model = model_override or getattr(self.settings, "OPENROUTER_MODEL", "google/gemma-2-9b-it:free") messages = [] if system: messages.append({"role": "system", "content": system}) messages.append({"role": "user", "content": prompt}) response = await self.openrouter_client.chat.completions.create( model=model, messages=messages, response_format={"type": "json_object"} if force_json else None ) return response.choices[0].message.content.strip() async def _execute_ollama(self, prompt, system, force_json, max_retries, base_delay): """Lokaler Ollama Call mit exponentiellem Backoff.""" payload = { "model": self.settings.LLM_MODEL, "prompt": prompt, "stream": False, "options": { "temperature": 0.1 if force_json else 0.7, "num_ctx": 8192 } } if force_json: payload["format"] = "json" if system: payload["system"] = system attempt = 0 while True: try: res = await self.ollama_client.post("/api/generate", json=payload) res.raise_for_status() return res.json().get("response", "").strip() except Exception as e: attempt += 1 if attempt > max_retries: logger.error(f"Ollama Error after {attempt} retries: {e}") raise e wait_time = base_delay * (2 ** (attempt - 1)) logger.warning(f"⚠️ Ollama attempt {attempt} failed. Retrying in {wait_time}s...") await asyncio.sleep(wait_time) async def generate_rag_response(self, query: str, context_str: str) -> str: """Vollständiges RAG Chat-Interface.""" provider = self.settings.MINDNET_LLM_PROVIDER system_prompt = self.get_prompt("system_prompt", provider) rag_template = self.get_prompt("rag_template", provider) final_prompt = rag_template.format(context_str=context_str, query=query) return await self.generate_raw_response( final_prompt, system=system_prompt, priority="realtime" ) async def close(self): """Schließt die HTTP-Verbindungen.""" if self.ollama_client: await self.ollama_client.aclose()