"""Main Text Generation Service for ALwrity Backend. This service provides the main LLM text generation functionality, migrated from the legacy lib/gpt_providers/text_generation/main_text_generation.py """ import os import json from typing import Optional, Dict, Any, List from datetime import datetime from loguru import logger from fastapi import HTTPException from .gemini_provider import gemini_text_response, gemini_structured_json_response from .huggingface_provider import huggingface_text_response, huggingface_structured_json_response from .tenant_provider_config import get_available_text_providers, get_tenant_api_key from .routing_observability import emit_routing_event def _normalize_provider(provider: Optional[str]) -> Optional[str]: if not provider: return None provider_aliases = { "gemini": "google", "google": "google", "hf": "huggingface", "hf_response_api": "huggingface", "huggingface": "huggingface", "wavespeed": "huggingface", } value = str(provider).strip().lower() return provider_aliases.get(value, value) def _parse_csv_env(value: Optional[str]) -> List[str]: if not value: return [] return [v.strip() for v in str(value).split(",") if v.strip()] def _resolve_provider_sequence( preferred_provider: Optional[str], env_provider_raw: str, available_providers: List[str], ) -> List[str]: configured = _parse_csv_env(preferred_provider) if preferred_provider else _parse_csv_env(env_provider_raw) normalized = [_normalize_provider(p) for p in configured if _normalize_provider(p)] if not normalized: if "google" in available_providers: return ["google"] if "huggingface" in available_providers: return ["huggingface"] return [] # preserve order and keep only available providers sequence = [] for provider in normalized: if provider in available_providers: sequence.append(provider) # strict mode for single configured provider: no silent remap if len(normalized) == 1: return sequence # multi-provider mode: append any other available providers as tail only if none configured are available if not sequence: return [p for p in ["huggingface", "google"] if p in available_providers] return sequence def _map_logical_model_to_provider_model(provider: str, model_name: str) -> str: """Map logical model aliases/full names to provider-specific model IDs.""" raw = (model_name or "").strip() if not raw: return raw # Full provider path supplied explicitly; use as-is. if "/" in raw: return raw key = raw.lower() hf_map = { "gpt-oss": "openai/gpt-oss-120b:cerebras", "gpt-oss-120b": "openai/gpt-oss-120b:cerebras", "gpt-oss-20b": "openai/gpt-oss-20b:cerebras", "mistral": "mistralai/Mistral-7B-Instruct-v0.3:cerebras", "mistral-7b": "mistralai/Mistral-7B-Instruct-v0.3:cerebras", "llama": "meta-llama/Llama-3.1-8B-Instruct:groq", "llama-8b": "meta-llama/Llama-3.1-8B-Instruct:groq", "llama-70b": "meta-llama/Llama-3.1-70B-Instruct:groq", } wavespeed_map = { "gpt-oss": "openai/gpt-oss-120b", "gpt-oss-120b": "openai/gpt-oss-120b", "gpt-oss-20b": "openai/gpt-oss-20b", "mistral": "mistralai/Mistral-7B-Instruct-v0.3", "mistral-7b": "mistralai/Mistral-7B-Instruct-v0.3", "llama": "meta-llama/Llama-3.1-8B-Instruct", "llama-8b": "meta-llama/Llama-3.1-8B-Instruct", "llama-70b": "meta-llama/Llama-3.1-70B-Instruct", } if provider in {"huggingface", "hf", "hf_response_api"}: return hf_map.get(key, raw) if provider == "wavespeed": return wavespeed_map.get(key, raw) return raw def _resolve_model_sequence(provider: str, preferred_hf_models: Optional[List[str]] = None) -> List[str]: models_env = _parse_csv_env(os.getenv("TEXTGEN_AI_MODELS", "")) if provider == "google": return ["gemini-2.0-flash-001"] if preferred_hf_models: return [_map_logical_model_to_provider_model(provider, m) for m in preferred_hf_models if m] if not models_env: return ["openai/gpt-oss-120b:groq"] resolved = [_map_logical_model_to_provider_model(provider, m) for m in models_env if m.strip()] return resolved or ["openai/gpt-oss-120b:groq"] def llm_text_gen( prompt: str, system_prompt: Optional[str] = None, json_struct: Optional[Dict[str, Any]] = None, user_id: str = None, preferred_hf_models: Optional[List[str]] = None, preferred_provider: Optional[str] = None, flow_type: str = "default", ) -> str: """ Generate text using Language Model (LLM) based on the provided prompt. Args: prompt (str): The prompt to generate text from. system_prompt (str, optional): Custom system prompt to use instead of the default one. json_struct (dict, optional): JSON schema structure for structured responses. user_id (str): Clerk user ID for subscription checking (required). Returns: str: Generated text based on the prompt. Raises: RuntimeError: If subscription limits are exceeded or user_id is missing. """ try: logger.info("[llm_text_gen] Starting text generation") logger.debug(f"[llm_text_gen] Prompt length: {len(prompt)} characters") # Set default values for LLM parameters gpt_provider = "google" model = "gemini-2.0-flash-001" temperature = 0.7 max_tokens = 4000 top_p = 0.9 n = 1 env_provider_raw = os.getenv('GPT_PROVIDER', '').lower() env_provider = _normalize_provider(env_provider_raw) preferred_provider_normalized = _normalize_provider(preferred_provider) # Default blog characteristics blog_tone = "Professional" blog_demographic = "Professional" blog_type = "Informational" blog_language = "English" blog_output_format = "markdown" blog_length = 2000 available_providers = get_available_text_providers(user_id) provider_sequence = _resolve_provider_sequence(preferred_provider, env_provider_raw, available_providers) if not provider_sequence: logger.error("[llm_text_gen] No configured providers available for tenant.") raise RuntimeError("No LLM providers available for tenant.") # strict mode if single configured provider; multi-provider fallback if comma-separated providers pinned_provider = len(_parse_csv_env(preferred_provider or env_provider_raw)) == 1 and bool(preferred_provider or env_provider_raw) gpt_provider = provider_sequence[0] model_sequence = _resolve_model_sequence(gpt_provider, preferred_hf_models) model = model_sequence[0] hf_api_key = get_tenant_api_key(user_id, "huggingface") if gpt_provider == "huggingface" else None logger.info( "[llm_text_gen] Mode | providers={} | models={} | env_models={} | strict_provider={} | strict_model={}", provider_sequence, model_sequence, _parse_csv_env(os.getenv("TEXTGEN_AI_MODELS", "")), pinned_provider, len(model_sequence) == 1, ) logger.debug(f"[llm_text_gen] Using provider: {gpt_provider}, model: {model}") emit_routing_event( logger, "text_route_selected", user_id=user_id, flow_type=flow_type, provider_selected=gpt_provider, model_selected=model, env_provider=env_provider_raw or "auto", fallback_count=0, ) # Map provider name to APIProvider enum (define at function scope for usage tracking) from models.subscription_models import APIProvider provider_enum = None # Store actual provider name for logging (e.g., "huggingface", "gemini") actual_provider_name = None if gpt_provider == "google": provider_enum = APIProvider.GEMINI actual_provider_name = "gemini" # Use "gemini" for consistency in logs elif gpt_provider == "huggingface": provider_enum = APIProvider.MISTRAL # HuggingFace maps to Mistral enum for usage tracking actual_provider_name = "huggingface" # Keep actual provider name for logs if not provider_enum: raise RuntimeError(f"Unknown provider {gpt_provider} for subscription checking") # SUBSCRIPTION CHECK - Required and strict enforcement if not user_id: raise RuntimeError("user_id is required for subscription checking. Please provide Clerk user ID.") try: from services.database import get_session_for_user from services.subscription import UsageTrackingService, PricingService from models.subscription_models import UsageSummary db = get_session_for_user(user_id) if not db: logger.error(f"[llm_text_gen] Could not get database session for user {user_id}") raise RuntimeError("Database connection failed") try: usage_service = UsageTrackingService(db) pricing_service = PricingService(db) # Estimate tokens from prompt (input tokens) # CRITICAL: Use worst-case scenario (input + max_tokens) for validation to prevent abuse # This ensures we block requests that would exceed limits even if response is longer than expected input_tokens = int(len(prompt.split()) * 1.3) # Worst-case estimate: assume maximum possible output tokens (max_tokens if specified) # This prevents abuse where actual response tokens exceed the estimate if max_tokens: estimated_output_tokens = max_tokens # Use maximum allowed output tokens else: # If max_tokens not specified, use conservative estimate (input * 1.5) estimated_output_tokens = int(input_tokens * 1.5) estimated_total_tokens = input_tokens + estimated_output_tokens logger.info( "[llm_text_gen][subscription_preflight] start | user_id={} | provider={} | tokens_requested={}", user_id, actual_provider_name or provider_enum.value, estimated_total_tokens, ) # Check limits using sync method from pricing service (strict enforcement) can_proceed, message, usage_info = pricing_service.check_usage_limits( user_id=user_id, provider=provider_enum, tokens_requested=estimated_total_tokens, actual_provider_name=actual_provider_name # Pass actual provider name for correct error messages ) if not can_proceed: logger.warning(f"[llm_text_gen] Subscription limit exceeded for user {user_id}: {message}") # Raise HTTPException(429) with usage info so frontend can display subscription modal error_detail = { 'error': message, 'message': message, 'provider': actual_provider_name or provider_enum.value, 'usage_info': usage_info if usage_info else {} } raise HTTPException(status_code=429, detail=error_detail) logger.info( "[llm_text_gen][subscription_preflight] pass | user_id={} | provider={} | tokens_requested={}", user_id, actual_provider_name or provider_enum.value, estimated_total_tokens, ) # Get current usage for limit checking only current_period = pricing_service.get_current_billing_period(user_id) or datetime.now().strftime("%Y-%m") usage = db.query(UsageSummary).filter( UsageSummary.user_id == user_id, UsageSummary.billing_period == current_period ).first() # No separate log here - we'll create unified log after API call and usage tracking finally: db.close() except HTTPException: # Re-raise HTTPExceptions (e.g., 429 subscription limit) - preserve error details raise except RuntimeError: # Re-raise subscription limit errors raise except Exception as sub_error: # STRICT: Fail on subscription check errors logger.error(f"[llm_text_gen] Subscription check failed for user {user_id}: {sub_error}") raise RuntimeError(f"Subscription check failed: {str(sub_error)}") # Construct the system prompt if not provided if system_prompt is None: system_instructions = f"""You are a highly skilled content writer with a knack for creating engaging and informative content. Your expertise spans various writing styles and formats. Writing Style Guidelines: - Tone: {blog_tone} - Target Audience: {blog_demographic} - Content Type: {blog_type} - Language: {blog_language} - Output Format: {blog_output_format} - Target Length: {blog_length} words Please provide responses that are: - Well-structured and easy to read - Engaging and informative - Tailored to the specified tone and audience - Professional yet accessible - Optimized for the target content type """ else: system_instructions = system_prompt # Generate response based on provider/model sequence response_text = None errors: List[str] = [] for provider_idx, provider_name in enumerate(provider_sequence): candidate_models = _resolve_model_sequence(provider_name, preferred_hf_models) for model_idx, candidate_model in enumerate(candidate_models): try: emit_routing_event( logger, "text_route_attempt", user_id=user_id, flow_type=flow_type, provider_selected=provider_name, model_selected=candidate_model, provider_attempt=provider_idx + 1, model_attempt=model_idx + 1, ) if provider_name == "google": if json_struct: response_text = gemini_structured_json_response( prompt=prompt, schema=json_struct, temperature=temperature, top_p=top_p, top_k=n, max_tokens=max_tokens, system_prompt=system_instructions, ) else: response_text = gemini_text_response( prompt=prompt, temperature=temperature, top_p=top_p, n=n, max_tokens=max_tokens, system_prompt=system_instructions, ) elif provider_name == "huggingface": hf_api_key_current = get_tenant_api_key(user_id, "huggingface") if json_struct: response_text = huggingface_structured_json_response( prompt=prompt, schema=json_struct, model=candidate_model, temperature=temperature, max_tokens=max_tokens, system_prompt=system_instructions, api_key=hf_api_key_current, ) else: response_text = huggingface_text_response( prompt=prompt, model=candidate_model, temperature=temperature, max_tokens=max_tokens, top_p=top_p, system_prompt=system_instructions, api_key=hf_api_key_current, ) else: raise RuntimeError(f"Unknown provider {provider_name}") if response_text: logger.info(f"[llm_text_gen] ✅ API call successful, tracking usage for user {user_id}, provider {provider_enum.value}") try: from services.intelligence.agents.agent_usage_tracking import track_agent_usage_sync track_agent_usage_sync( user_id=user_id, model_name=candidate_model, prompt=prompt, response_text=response_text, duration=0.5, ) except Exception as usage_error: logger.error(f"[llm_text_gen] ❌ Failed to track usage: {usage_error}", exc_info=True) return response_text except Exception as provider_error: err = f"provider={provider_name},model={candidate_model},error={provider_error}" errors.append(err) logger.error("[llm_text_gen] Attempt failed: {}", err) continue # strict provider mode: single configured provider should not switch if pinned_provider and len(provider_sequence) == 1: break logger.error("[llm_text_gen] CIRCUIT BREAKER: All configured provider/model attempts failed. {}", errors) raise RuntimeError("All configured LLM provider/model attempts failed.") except Exception as e: logger.error(f"[llm_text_gen] Error during text generation: {str(e)}") raise def check_gpt_provider(gpt_provider: str) -> bool: """Check if the specified GPT provider is supported.""" providers = [_normalize_provider(p) for p in _parse_csv_env(gpt_provider)] if not providers: providers = [_normalize_provider(gpt_provider)] supported_providers = {"google", "huggingface"} return all(p in supported_providers for p in providers if p) def get_api_key(gpt_provider: str, user_id: Optional[str] = None) -> Optional[str]: """Get API key for the specified provider, preferring tenant-scoped keys.""" try: return get_tenant_api_key(user_id, gpt_provider) except Exception as e: logger.error(f"[get_api_key] Error getting API key for {gpt_provider}: {str(e)}") return None