tiny/app/main.py at b10c2f00bdda2b33ceaab498faeebb759107f9fa · recursivezero/tiny · GitHub

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# app/main.py
from contextlib import asynccontextmanager
from pathlib import Path
import logging
import asyncio

from fastapi import FastAPI, Request

# from fastapi.responses import JSONResponse
from fastapi.staticfiles import StaticFiles
from starlette.middleware.sessions import SessionMiddleware

# from fastapi.exceptions import RequestValidationError
# from starlette.exceptions import HTTPException as StarletteHTTPException
from fastapi.templating import Jinja2Templates

from app.routes import ui_router
from app.utils import db
from app.utils.cache import cleanup_expired

# -----------------------------
# Background cache cleanup task
# -----------------------------
from app.utils.config import (
    CACHE_TTL,
    SESSION_SECRET,
)


async def cache_health_check():
    logger = logging.getLogger(__name__)
    logger.info("🧹 Cache cleanup task started")

    interval = max(1, CACHE_TTL // 3)  # pure TTL-based

    logger.info(f"🕒 Cache cleanup interval set to {interval}s")

    while True:
        try:
            cleanup_expired()
        except Exception as e:
            logger.error(f"Cache cleanup error: {e}")
        await asyncio.sleep(interval)


# -----------------------------
# Lifespan: env + DB connect ONCE (DB-optional)
# -----------------------------
@asynccontextmanager
async def lifespan(app: FastAPI):
    logger = logging.getLogger(__name__)
    logger.info("Application startup: Initializing services...")

    # DB init (optional)
    db_ok = db.connect_db()
    if db_ok:
        db.start_health_check()
        logger.info("🟢 MongoDB enabled")
    else:
        logger.warning("🟡 MongoDB disabled (cache-only mode)")

    # Cache TTL cleanup
    cache_task = asyncio.create_task(cache_health_check())
    logger.info("🧹 Cache TTL cleanup enabled")

    logger.info("Application startup complete")
    yield

    logger.info("Application shutdown: Cleaning up...")

    # Stop cache task
    cache_task.cancel()
    try:
        await cache_task
    except asyncio.CancelledError:
        logger.info("🧹 Cache cleanup task stopped")

    # Stop DB health check
    try:
        await db.stop_health_check()
    except Exception as e:
        logger.error(f"Error stopping health check: {str(e)}")

    # Close Mongo client if exists
    try:
        if db.client is not None:
            db.client.close()
            logger.info("MongoDB client closed")
    except Exception as e:
        logger.error(f"Error closing MongoDB client: {str(e)}")

    logger.info("Application shutdown complete")


app = FastAPI(title="TinyURL", lifespan=lifespan)
app.add_middleware(SessionMiddleware, secret_key=SESSION_SECRET)
templates = Jinja2Templates(directory="app/templates")

BASE_DIR = Path(__file__).resolve().parent
STATIC_DIR = BASE_DIR / "static"

app.mount("/static", StaticFiles(directory=STATIC_DIR), name="static")

# QR codes are now served from /qr, which maps to assets/images/qr in the project root
PROJECT_ROOT = BASE_DIR.parent
QR_DIR = PROJECT_ROOT / "assets" / "images" / "qr"
app.mount("/qr", StaticFiles(directory=QR_DIR), name="qr")

# -----------------------------
# Global error handler
# -----------------------------
# app.exception_handler(Exception)
# sync def global_exception_handler(request: Request, exc: Exception):
#    traceback.print_exc()
#    return JSONResponse(
#        status_code=500,
#        content={"success": False, "error": "INTERNAL_SERVER_ERROR"},
#    )


@app.exception_handler(404)
async def custom_404_handler(request: Request, exc):
    return templates.TemplateResponse(
        "404.html",
        {"request": request},
        status_code=404,
    )


# -----------------------------
# Routers (UI + API)
# -----------------------------
app.include_router(ui_router)  # UI routes at "/"