import os import json import logging import boto3 from fastapi import FastAPI, HTTPException from fastapi.responses import JSONResponse from transformers import AutoModelForCausalLM, AutoTokenizer, pipeline from huggingface_hub import hf_hub_download from tqdm import tqdm logging.basicConfig(level=logging.INFO) logger = logging.getLogger(__name__) AWS_ACCESS_KEY_ID = os.getenv("AWS_ACCESS_KEY_ID") AWS_SECRET_ACCESS_KEY = os.getenv("AWS_SECRET_ACCESS_KEY") AWS_REGION = os.getenv("AWS_REGION") S3_BUCKET_NAME = os.getenv("S3_BUCKET_NAME") HUGGINGFACE_TOKEN = os.getenv("HUGGINGFACE_TOKEN") s3_client = boto3.client( 's3', aws_access_key_id=AWS_ACCESS_KEY_ID, aws_secret_access_key=AWS_SECRET_ACCESS_KEY, region_name=AWS_REGION ) app = FastAPI() PIPELINE_MAP = { "text-generation": "text-generation", "sentiment-analysis": "sentiment-analysis", "translation": "translation", "fill-mask": "fill-mask", "question-answering": "question-answering", "text-to-speech": "text-to-speech", "text-to-video": "text-to-video", "text-to-image": "text-to-image" } class S3DirectStream: def __init__(self, bucket_name): self.s3_client = boto3.client( 's3', aws_access_key_id=AWS_ACCESS_KEY_ID, aws_secret_access_key=AWS_SECRET_ACCESS_KEY, region_name=AWS_REGION ) self.bucket_name = bucket_name def stream_from_s3(self, key): try: response = self.s3_client.get_object(Bucket=self.bucket_name, Key=key) return response['Body'] except self.s3_client.exceptions.NoSuchKey: raise HTTPException(status_code=404, detail=f"El archivo {key} no existe en el bucket S3.") except Exception as e: raise HTTPException(status_code=500, detail=f"Error al descargar {key} desde S3: {str(e)}") def get_model_file_parts(self, model_name): try: model_prefix = model_name.lower() files = self.s3_client.list_objects_v2(Bucket=self.bucket_name, Prefix=model_prefix) model_files = [obj['Key'] for obj in files.get('Contents', []) if model_prefix in obj['Key']] return model_files except Exception as e: raise HTTPException(status_code=500, detail=f"Error al obtener archivos del modelo {model_name} desde S3: {e}") def load_model_from_s3(self, model_name): try: profile, model = model_name.split("/", 1) if "/" in model_name else ("", model_name) model_prefix = f"{profile}/{model}".lower() model_files = self.get_model_file_parts(model_prefix) if not model_files: self.download_and_upload_from_huggingface(model_name) model_files = self.get_model_file_parts(model_prefix) if not model_files: raise HTTPException(status_code=404, detail=f"Archivos del modelo {model_name} no encontrados en S3.") config_stream = self.stream_from_s3(f"{model_prefix}/config.json") config_data = config_stream.read() if not config_data: raise HTTPException(status_code=500, detail=f"El archivo de configuración {model_prefix}/config.json está vacío.") config_text = config_data.decode("utf-8") config_json = json.loads(config_text) model = AutoModelForCausalLM.from_pretrained(f"s3://{self.bucket_name}/{model_prefix}", config=config_json, from_tf=False) return model except HTTPException as e: raise e except Exception as e: try: logger.error(f"Error al cargar el modelo desde S3, intentando desde Hugging Face: {e}") model = AutoModelForCausalLM.from_pretrained(model_name) return model except Exception as hf_error: raise HTTPException(status_code=500, detail=f"Error al cargar el modelo desde Hugging Face: {hf_error}") def load_tokenizer_from_s3(self, model_name): try: profile, model = model_name.split("/", 1) if "/" in model_name else ("", model_name) tokenizer_stream = self.stream_from_s3(f"{profile}/{model}/tokenizer.json") tokenizer_data = tokenizer_stream.read().decode("utf-8") tokenizer = AutoTokenizer.from_pretrained(f"s3://{self.bucket_name}/{profile}/{model}") return tokenizer except Exception as e: raise HTTPException(status_code=500, detail=f"Error al cargar el tokenizer desde S3: {e}") def download_and_upload_from_huggingface(self, model_name): try: files_to_download = hf_hub_download(repo_id=model_name, use_auth_token=HUGGINGFACE_TOKEN, local_dir=model_name) for file in tqdm(files_to_download, desc="Subiendo archivos a S3"): file_name = os.path.basename(file) profile, model = model_name.split("/", 1) if "/" in model_name else ("", model_name) s3_key = f"{profile}/{model}/{file_name}" if not self.file_exists_in_s3(s3_key): self.upload_file_to_s3(file, s3_key) except Exception as e: raise HTTPException(status_code=500, detail=f"Error al descargar y subir modelo desde Hugging Face: {e}") def upload_file_to_s3(self, file_path, s3_key): try: self.create_s3_folders(s3_key) s3_client.put_object(Bucket=self.bucket_name, Key=s3_key, Body=open(file_path, 'rb')) os.remove(file_path) except Exception as e: raise HTTPException(status_code=500, detail=f"Error al subir archivo a S3: {e}") def create_s3_folders(self, s3_key): try: folder_keys = s3_key.split('/') for i in range(1, len(folder_keys)): folder_key = '/'.join(folder_keys[:i]) + '/' if not self.file_exists_in_s3(folder_key): self.s3_client.put_object(Bucket=self.bucket_name, Key=folder_key, Body='') except Exception as e: raise HTTPException(status_code=500, detail=f"Error al crear carpetas en S3: {e}") def file_exists_in_s3(self, s3_key): try: self.s3_client.head_object(Bucket=self.bucket_name, Key=s3_key) return True except self.s3_client.exceptions.ClientError: return False @app.post("/predict/") async def predict(model_request: dict): try: model_name = model_request.get("model_name") task = model_request.get("pipeline_task") input_text = model_request.get("input_text") if not model_name or not task or not input_text: raise HTTPException(status_code=400, detail="Faltan parámetros en la solicitud.") streamer = S3DirectStream(S3_BUCKET_NAME) model = streamer.load_model_from_s3(model_name) tokenizer = streamer.load_tokenizer_from_s3(model_name) if task not in PIPELINE_MAP: raise HTTPException(status_code=400, detail="Pipeline task no soportado") nlp_pipeline = pipeline(PIPELINE_MAP[task], model=model, tokenizer=tokenizer) result = nlp_pipeline(input_text) if isinstance(result, dict) and 'file' in result: return JSONResponse(content={"file": result['file']}) else: return JSONResponse(content={"result": result}) except Exception as e: raise HTTPException(status_code=500, detail=f"Error al realizar la predicción: {e}") if __name__ == "__main__": import uvicorn uvicorn.run(app, host="0.0.0.0", port=7860)