refactor v2

Dockerfile

@@ -5,5 +5,11 @@ ENV PYTHONUNBUFFERED=1
 COPY requirements.txt .
 RUN pip install --no-cache-dir -r requirements.txt
 COPY . .
+# Expose dynamic port
 EXPOSE 8798
-CMD ["python", "app.py"]
+
+# Healthcheck
+HEALTHCHECK CMD python -c "import requests; r=requests.get('http://localhost:${FLASK_PORT:-8798}',timeout=5);exit(0 if r.ok else 1)" || exit 1
+
+ENV FLASK_PORT=${FLASK_PORT:-8798}
+CMD ["sh", "-c", "gunicorn -k geventwebsocket.gunicorn.workers.GeventWebSocketWorker -w 1 --threads 16 --bind 0.0.0.0:$FLASK_PORT --timeout 60 app:app"]