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| """ | |
| Echo FastAPI backend. | |
| Run with: | |
| uvicorn main:app --reload --host 0.0.0.0 --port 8000 | |
| """ | |
| from __future__ import annotations | |
| import logging | |
| from contextlib import asynccontextmanager | |
| from pathlib import Path | |
| from typing import AsyncGenerator | |
| import time | |
| from fastapi import FastAPI, Request | |
| from fastapi.middleware.cors import CORSMiddleware | |
| from fastapi.responses import FileResponse | |
| from fastapi.staticfiles import StaticFiles | |
| from app.api.routes import router | |
| from app.services.recommender import recommender | |
| logging.basicConfig(level=logging.INFO, format="%(levelname)s | %(name)s | %(message)s") | |
| logger = logging.getLogger(__name__) | |
| async def lifespan(app: FastAPI) -> AsyncGenerator[None, None]: | |
| logger.info("Starting Echo backend…") | |
| recommender.load() # Load CLAP + FAISS index once at startup | |
| yield | |
| logger.info("Shutting down Echo backend.") | |
| app = FastAPI( | |
| title="Echo API", | |
| version="1.0.0", | |
| lifespan=lifespan, | |
| ) | |
| async def add_process_time_header(request: Request, call_next): | |
| start_time = time.perf_counter() | |
| response = await call_next(request) | |
| process_time = time.perf_counter() - start_time | |
| response.headers["X-Process-Time"] = f"{process_time:.6f}" | |
| return response | |
| app.add_middleware( | |
| CORSMiddleware, | |
| allow_origins=["*"], # Tighten in production | |
| allow_methods=["*"], | |
| allow_headers=["*"], | |
| ) | |
| app.include_router(router) | |
| # Mount web client static assets and root page | |
| STATIC_DIR = Path(__file__).parent / "static" | |
| if STATIC_DIR.exists(): | |
| app.mount("/static", StaticFiles(directory=str(STATIC_DIR)), name="static") | |
| async def serve_index() -> FileResponse: | |
| return FileResponse(STATIC_DIR / "index.html") | |