Got gunicorn working. Problem with sqlite intiailization to fix.

Dockerfile

@@ -38,4 +38,4 @@ COPY --from=builder /usr/local /usr/local
 USER myuser
 
 # Start gunicorn with the appropriate options
-CMD ["gunicorn", "-b", "0.0.0.0:5000", "--workers=3", "app:app"]
+CMD ["gunicorn", "-b", "0.0.0.0:3000", "--log-level=debug", "--workers=3", "app:create_app('default')"]

app.py

@@ -6,11 +6,13 @@ from pywebpush import webpush, WebPushException
 import json
 import os
 
-app = Flask(__name__)
-app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///webpush.db'
-db.init_app(app)
+def create_app(config_name):
+    app = Flask(__name__)
+    app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///webpush.db'
+    db.init_app(app)
 
-def generate_and_save_vapid_keys():
+
+    def generate_and_save_vapid_keys():
         vapid = Vapid()
         vapid.generate_keys()
         private_key = vapid.get_private_key().to_pem().decode('utf-8').strip()
@@ -21,12 +23,12 @@ def generate_and_save_vapid_keys():
         db.session.commit()
 
 
-@app.before_first_request
-def initialize():
+    def initialize():
         if not VAPIDKey.query.first():
             generate_and_save_vapid_keys()
 
-def send_push_notification(subscription_info, message, vapid_key):
+
+    def send_push_notification(subscription_info, message, vapid_key):
         try:
             webpush(
                 subscription_info=subscription_info,
@@ -40,16 +42,16 @@ def send_push_notification(subscription_info, message, vapid_key):
             print(f"Failed to send notification: {e}")
 
 
-@app.route('/web-push/vapid', methods=['GET'])
-def get_vapid():
+    @app.route('/web-push/vapid', methods=['GET'])
+    def get_vapid():
         key = VAPIDKey.query.first()
         if key:
             return jsonify(public_key=key.public_key)
         return jsonify(error='No VAPID keys found'), 404
 
 
-@app.route('/web-push/subscribe', methods=['POST'])
-def subscribe():
+    @app.route('/web-push/subscribe', methods=['POST'])
+    def subscribe():
         content = request.json
         vapid_key = VAPIDKey.query.first()
 
@@ -77,8 +79,8 @@ def subscribe():
         return jsonify(success=True)
 
 
-@app.route('/web-push/unsubscribe', methods=['DELETE'])
-def unsubscribe():
+    @app.route('/web-push/unsubscribe', methods=['DELETE'])
+    def unsubscribe():
         content = request.json
         endpoint = content['endpoint']
         subscription = Subscription.query.filter_by(endpoint=endpoint).first()
@@ -90,6 +92,4 @@ def unsubscribe():
         else:
             return jsonify(success=False, error="Subscription not found"), 404
 
-    
-if __name__ == '__main__':
-    app.run(debug=True)
+    return app

requirements.txt

@@ -1,4 +1,5 @@
-flask
+flask>=2.0.0
 flask_sqlalchemy
 py_vapid
 pywebpush
+gunicorn