Switching to gevent and upgrading psycopg to 3.x

flask/Dockerfile

@@ -19,6 +19,6 @@ USER flaskuser
 # CMD python application.py run --debug --host 0.0.0.0
 
 # without Flask-SocketIO
-# CMD gunicorn --access-logfile '-' --workers 3 --threads 4 --bind 0.0.0.0:5000 application:application
-# with Flask-SocketIO, gunicorn does not support sticky sessions, workers must be 1. eventlet takes care of multi-threading, threads must be 1
-CMD gunicorn --access-logfile '-' --log-level 'debug' --worker-class eventlet --workers 1 --bind 0.0.0.0:5000 application:application
+# CMD gunicorn --access-logfile '-' -w 3 -t 4 -b 0.0.0.0:5000 application:application
+# with Flask-SocketIO, gunicorn does not support sticky sessions, workers must be 1. gevent takes care of multi-threading, threads must be 1
+CMD gunicorn --access-logfile '-' --log-level 'debug' -k gevent -w 1 -b 0.0.0.0:5000 application:application

flask/app/__init__.py

@@ -15,7 +15,7 @@ def create_app():
         r"/*": {"origins": []}
     })
 
-    app.config['SQLALCHEMY_DATABASE_URI'] = 'postgresql://{username}:{password}@{host}:{port}/{database}'.format(
+    app.config['SQLALCHEMY_DATABASE_URI'] = 'postgresql+psycopg://{username}:{password}@{host}:{port}/{database}'.format(
         username=os.environ['RDS_USERNAME'],
         password=os.environ['RDS_PASSWORD'],
         host=os.environ['RDS_HOSTNAME'],

flask/application.py

@@ -1,7 +1,5 @@
-import eventlet  
-
-# perform monkey patching for eventlet
-eventlet.monkey_patch()
+from gevent import monkey
+monkey.patch_all()
 
 from flask import Flask, jsonify
 from app import create_app, db, socketio

flask/requirements.txt

@@ -1,28 +1,32 @@
 async-timeout==4.0.3
 bidict==0.22.1
+blinker==1.7.0
 click==8.1.7
-dnspython==2.4.2
-eventlet==0.34.2
-Flask==2.2.3
-Flask-Cors==3.0.10
+dnspython==2.5.0
+Flask==3.0.1
+Flask-Cors==4.0.0
 Flask-SocketIO==5.3.6
-Flask-SQLAlchemy==3.0.3
-greenlet==2.0.2
+Flask-SQLAlchemy==3.1.1
+gevent==23.9.1
+greenlet==3.0.3
 gunicorn==21.2.0
 h11==0.14.0
 importlib-metadata==7.0.1
 itsdangerous==2.1.2
-Jinja2==3.1.2
-MarkupSafe==2.1.3
+Jinja2==3.1.3
+MarkupSafe==2.1.4
 packaging==23.2
-psycopg2-binary==2.9.6
+psycopg==3.1.17
+psycopg-binary==3.1.17
 python-engineio==4.8.2
 python-socketio==5.11.0
 redis==5.0.1
 simple-websocket==1.0.0
 six==1.16.0
-SQLAlchemy==2.0.9
+SQLAlchemy==2.0.25
 typing_extensions==4.9.0
-Werkzeug==2.2.3
+Werkzeug==3.0.1
 wsproto==1.2.0
-zipp==3.15.0
+zipp==3.17.0
+zope.event==5.0
+zope.interface==6.1