115 lines
4.8 KiB
Python
115 lines
4.8 KiB
Python
import asyncio
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import functools
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import logging
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from typing import List, Dict, Any, Optional
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import numpy as np
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from app.services.korea_investment_api import korea_investment_api
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logger = logging.getLogger(__name__)
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class TensorFlowNotAvailable(Exception):
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pass
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class TensorFlowPredictor:
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"""Lightweight wrapper around a Keras model + scaler.
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- Lazily attempts to import TensorFlow/Keras and load model files.
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- If TensorFlow or model/scaler files are missing, raises TensorFlowNotAvailable
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so callers can handle gracefully (e.g., return 503 or a friendly message).
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- Fetches recent daily closes from KIS API.
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이슈 7: model.predict()는 CPU-bound 동기 호출이므로 predict_stock() 내에서
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asyncio.to_thread()로 워커 스레드에 위임해 이벤트 루프 블로킹을 방지한다.
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"""
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def __init__(self, model_path: str = "models/lstm_model.h5", scaler_path: str = "models/scaler.pkl", time_steps: int = 60):
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self.model_path = model_path
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self.scaler_path = scaler_path
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self.time_steps = time_steps
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try:
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import tensorflow as tf # noqa: F401
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from tensorflow import keras # noqa: F401
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import joblib # noqa: F401
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except Exception as e:
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logger.warning(f"TensorFlow or joblib not available: {e}")
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raise TensorFlowNotAvailable("TensorFlow/joblib not installed in backend environment")
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try:
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from tensorflow import keras
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import joblib
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self.model = keras.models.load_model(self.model_path)
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self.scaler = joblib.load(self.scaler_path)
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except Exception as e:
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logger.warning(f"Failed to load TF model/scaler: {e}")
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raise TensorFlowNotAvailable(f"Model or scaler not found: {e}")
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async def fetch_kis_closes(self, stock_code: str, days: int = 60) -> np.ndarray:
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"""Fetch recent daily closes from KIS. Returns array oldest→latest."""
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try:
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resp = await korea_investment_api.get_daily_chart(stock_code, "D")
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output = resp.get("output") or []
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if not output:
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raise RuntimeError("empty_chart")
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closes_desc = [float(item.get("stck_clpr", 0) or 0) for item in output]
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closes = list(reversed(closes_desc))
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arr = np.array(closes[-days:], dtype=float)
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if arr.size < days:
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logger.info(f"{stock_code}: only {arr.size} closes available (requested {days})")
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return arr
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except Exception as e:
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logger.error(f"Failed to fetch KIS closes for {stock_code}: {e}")
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raise
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async def predict_stock(self, stock_code: str) -> Dict[str, Any]:
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"""Return prediction dict with expected_return and simple signal.
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model.predict()를 asyncio.to_thread()로 워커 스레드에서 실행해
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Keras/TF의 GIL-holding 연산이 이벤트 루프를 막지 않게 한다.
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"""
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try:
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prices = await self.fetch_kis_closes(stock_code, days=self.time_steps)
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if prices.size == 0:
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raise RuntimeError("no_price_data")
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scaled = self.scaler.transform(prices.reshape(-1, 1))
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if scaled.shape[0] < self.time_steps:
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pad = np.repeat(scaled[0:1], self.time_steps - scaled.shape[0], axis=0)
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scaled = np.vstack([pad, scaled])
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X_input = scaled[-self.time_steps:].reshape(1, self.time_steps, 1)
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# ── 이슈 7: CPU-bound model.predict → 워커 스레드로 분리 ──────
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predict_fn = functools.partial(self.model.predict, X_input, verbose=0)
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predicted_scaled = await asyncio.to_thread(predict_fn)
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# ─────────────────────────────────────────────────────────────
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predicted_price = float(self.scaler.inverse_transform(predicted_scaled)[0][0])
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current_price = float(prices[-1])
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expected_return = (
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(predicted_price - current_price) / current_price * 100.0
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if current_price > 0 else 0.0
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)
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signal = "BUY" if predicted_price > current_price * 1.02 else "HOLD"
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return {
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"stock_code": stock_code,
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"current_price": current_price,
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"predicted_price": predicted_price,
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"expected_return": expected_return,
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"signal": signal,
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}
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except TensorFlowNotAvailable:
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raise
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except Exception as e:
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logger.error(f"Prediction failed for {stock_code}: {e}")
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return {
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"stock_code": stock_code,
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"error": str(e),
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}
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