Configure Docker to use Gunicorn instead of Flask development server for production deployment. Updated SocketIO configuration for gevent compatibility.

Dockerfile

@@ -36,5 +36,5 @@ EXPOSE 5000
 HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
     CMD python -c "import requests; requests.get('http://localhost:5000/health', timeout=2)" || exit 1
 
-# Run the application
+# Run the application with Gunicorn using gevent workers for SocketIO compatibility
-CMD ["python", "run.py"]
+CMD ["gunicorn", "--bind", "0.0.0.0:5000", "--workers", "4", "--worker-class", "gevent", "--worker-connections", "1000", "--timeout", "30", "wsgi:app"]

app/__init__.py

@@ -12,9 +12,10 @@ from config import config
 from app.models import SimulationManager
 
 # Initialize SocketIO with enhanced proxy support
+# For Gunicorn compatibility, we need to set the async_mode to 'gevent'
 socketio = SocketIO(
     cors_allowed_origins="*",
-    async_mode='threading',
+    async_mode='gevent' if os.getenv('FLASK_ENV') == 'production' else 'threading',
     logger=False,  # Disable to avoid log spam in production
     engineio_logger=False,
     # Transport order: try websocket first, then polling
@@ -54,7 +55,7 @@ def create_app(config_name=None):
     # Initialize extensions with proxy-friendly settings
     socketio.init_app(
         app, 
-        async_mode='threading',
+        async_mode='gevent' if config_name == 'production' else 'threading',
         cors_allowed_origins="*",
         allow_upgrades=True,
         transports=['websocket', 'polling'],

requirements.txt

@@ -3,3 +3,5 @@ Flask-SocketIO>=5.0.0
 numpy>=1.21.0
 matplotlib>=3.5.0
 plotly>=5.0.0
+gunicorn>=20.0.0
+gevent>=21.0.0

run.py

@@ -15,8 +15,11 @@ if __name__ == '__main__':
     debug_mode = config_name == 'development'
     port = int(os.getenv('PORT', 5000))  # Use PORT env var or default to 5000
     
-    # For production deployment, allow unsafe werkzeug or use a proper WSGI server
+    # For production deployment with Gunicorn, SocketIO will be handled by Gunicorn
+    # For development, we use SocketIO's built-in server
     if config_name == 'production':
+        # In production, Gunicorn will handle the server
+        # This is just a fallback
         socketio.run(app, debug=False, host='0.0.0.0', port=port, allow_unsafe_werkzeug=True)
     else:
         socketio.run(app, debug=debug_mode, host='0.0.0.0', port=port)

wsgi.py

@@ -0,0 +1,16 @@
+#!/usr/bin/env python3
+"""
+WSGI entry point for the Markov Economics Flask application.
+This file is used by Gunicorn to serve the application in production.
+"""
+
+import os
+from app import create_app
+
+# Use FLASK_ENV if set, otherwise default to production for Gunicorn
+config_name = os.getenv('FLASK_ENV', 'production')
+app = create_app(config_name)
+
+if __name__ == "__main__":
+    # This is just for testing purposes
+    app.run()