refactor: drop nginx+standalone, use static export served by FastAPI on :7860

Dockerfile

@@ -1,13 +1,13 @@
 # ─────────────────────────────────────────────────────────────────────────────
 # Hugging Face Spaces — Docker SDK
-# Architecture:
-#   supervisord manages three processes:
-#     - Next.js standalone server on :3000
-#     - FastAPI (uvicorn) on :8000
-#     - nginx on :7860 (routing frontend + backend)
+# 
+# Architecture (simplified — NO nginx, NO Next.js server process):
+#   1. Build Next.js as a static export → ./frontend/out/
+#   2. FastAPI serves the static files + handles /api/* and /ws/*
+#   3. Single process: uvicorn on port 7860
 # ─────────────────────────────────────────────────────────────────────────────
 
-# ── Stage 1: Build Next.js ──────────────────────────────────────────────────
+# ── Stage 1: Build Next.js static export ────────────────────────────────────
 FROM node:20-slim AS frontend-builder
 
 WORKDIR /build/frontend
@@ -15,28 +15,29 @@ COPY frontend/package*.json ./
 RUN npm ci
 
 COPY frontend/ ./
+# Empty API URL → NEXT_PUBLIC_API_URL="" means relative /api/* calls
+# which FastAPI will handle directly (same-origin)
 ENV NEXT_PUBLIC_API_URL=""
-ENV BUILD_STANDALONE=1
+# Trigger output: 'export' mode in next.config.js
+ENV BUILD_EXPORT=1
 RUN npm run build
 
-# ── Stage 2: Runtime ────────────────────────────────────────────────────────
+# ── Stage 2: Runtime (Python only, no nginx, no Node) ───────────────────────
 FROM python:3.10-slim
 
-# System deps
+# System deps: ffmpeg + OpenCV
 RUN apt-get update && apt-get install -y \
     ffmpeg libgl1 libglib2.0-0 \
-    nginx supervisor curl \
-    && curl -fsSL https://deb.nodesource.com/setup_20.x | bash - \
-    && apt-get install -y nodejs \
     && apt-get clean && rm -rf /var/lib/apt/lists/*
 
 WORKDIR /app
 
-# ── Python deps ──────────────────────────────────────────────────────────────
+# ── Python: CPU-only torch ───────────────────────────────────────────────────
 RUN pip install --no-cache-dir \
     torch==2.1.2 torchvision==0.16.2 \
     --index-url https://download.pytorch.org/whl/cpu
 
+# ── Python: app dependencies ─────────────────────────────────────────────────
 RUN pip install --no-cache-dir \
     "fastapi>=0.110.0" \
     "uvicorn[standard]>=0.29.0" \
@@ -48,33 +49,17 @@ RUN pip install --no-cache-dir \
     "imageio>=2.33.0" \
     "imageio-ffmpeg>=0.4.9"
 
-# ── Copy app code ────────────────────────────────────────────────────────────
+# ── Copy backend code ────────────────────────────────────────────────────────
 COPY backend/ ./backend/
 
-# ── Copy Next.js standalone build ───────────────────────────────────────────
-COPY --from=frontend-builder /build/frontend/.next/standalone ./frontend/
-COPY --from=frontend-builder /build/frontend/.next/static     ./frontend/.next/static
-COPY --from=frontend-builder /build/frontend/public           ./frontend/public
+# ── Copy Next.js static export ───────────────────────────────────────────────
+COPY --from=frontend-builder /build/frontend/out ./frontend/out
 
-# ── Configs ──────────────────────────────────────────────────────────────────
-COPY nginx.conf /etc/nginx/nginx.conf
-COPY supervisord.conf /etc/supervisor/conf.d/app.conf
-
-# ── Directories, Permissions & Cleanup ───────────────────────────────────────
-# Remove default nginx config to prevent conflicts
-RUN rm -f /etc/nginx/sites-enabled/default
-
-# Ensure all runtime directories exist and are writable by any user
-RUN mkdir -p /tmp/video_seg/uploads /tmp/video_seg/outputs \
-    && mkdir -p /tmp/client_temp /tmp/proxy_temp /tmp/fastcgi_temp /tmp/uwsgi_temp /tmp/scgi_temp \
-    && mkdir -p /var/log/supervisor /var/run /var/lib/nginx /var/log/nginx \
-    && chmod -R 777 /tmp \
-    && chmod -R 777 /var/log/supervisor \
-    && chmod -R 777 /var/lib/nginx \
-    && chmod -R 777 /var/log/nginx \
-    && chmod -R 777 /var/run
+# ── Storage dirs ─────────────────────────────────────────────────────────────
+RUN mkdir -p /tmp/video_seg/uploads /tmp/video_seg/outputs
 
 # HF Spaces requires port 7860
 EXPOSE 7860
 
-CMD ["/usr/bin/supervisord", "-n", "-c", "/etc/supervisor/supervisord.conf"]
+# Single process: FastAPI serves both the API and the static frontend
+CMD ["uvicorn", "backend.app_hf:app", "--host", "0.0.0.0", "--port", "7860", "--workers", "1"]

backend/app_hf.py

@@ -30,6 +30,7 @@ logger = logging.getLogger(__name__)
 
 UPLOAD_DIR = Path(os.getenv("UPLOAD_DIR", "/tmp/video_seg/uploads"))
 OUTPUT_DIR = Path(os.getenv("OUTPUT_DIR", "/tmp/video_seg/outputs"))
+# In Docker: /app/backend/../frontend/out = /app/frontend/out
 STATIC_DIR = Path(__file__).parent.parent / "frontend" / "out"
 
 UPLOAD_DIR.mkdir(parents=True, exist_ok=True)

frontend/next.config.js

@@ -1,14 +1,19 @@
 /** @type {import('next').NextConfig} */
 const nextConfig = {
-  // Local dev: talks directly to FastAPI on :8000
-  // Docker/HF build: NEXT_PUBLIC_API_URL="" — nginx routes /api/* to FastAPI
   env: {
     NEXT_PUBLIC_API_URL: process.env.NEXT_PUBLIC_API_URL ?? 'http://localhost:8000',
   },
 
-  // Standalone output is needed for Docker (HF Spaces).
-  // Set BUILD_STANDALONE=1 in Dockerfile; omit for local dev.
-  ...(process.env.BUILD_STANDALONE === '1' ? { 
+  // Docker/HF Spaces: static export served by FastAPI directly on :7860
+  ...(process.env.BUILD_EXPORT === '1' ? {
+    output: 'export',
+    eslint: { ignoreDuringBuilds: true },
+    typescript: { ignoreBuildErrors: true },
+    images: { unoptimized: true },
+  } : {}),
+
+  // Standalone build (not currently used but kept for reference)
+  ...(process.env.BUILD_STANDALONE === '1' ? {
     output: 'standalone',
     eslint: { ignoreDuringBuilds: true },
     typescript: { ignoreBuildErrors: true },