Update to Python 3.12.1

CHANGELOG.md

@@ -11,10 +11,11 @@ Changelog](https://keepachangelog.com/en/1.0.0/).
 
 - Convert `SECRET_KEY` into a required env var
 - Add `required: false` to `depends_on` in `docker-compose.yml` (requires Docker Compose v2.20.2+)
+- Refactor `create_celery_app` function to be compatible with Python 3.12+
 
 #### Languages and services
 
-- Update `Python` to `3.11.6`
+- Update `Python` to `3.12.1`
 - Update `Node` to `20.6.1`
 - Update `Postgres` to `16.1`
 - Update `Redis` to `7.2.3`

Dockerfile

@@ -33,7 +33,7 @@ CMD ["bash"]
 
 ###############################################################################
 
-FROM python:3.11.6-slim-bookworm AS app
+FROM python:3.12.1-slim-bookworm AS app
 LABEL maintainer="Nick Janetakis <nick.janetakis@gmail.com>"
 
 WORKDIR /app

README.md

@@ -14,7 +14,7 @@ practices](https://nickjanetakis.com/blog/best-practices-around-production-ready
 based on building and deploying dozens of assorted Dockerized web apps since
 late 2014.
 
-**This app is using Flask 3.0.0 and Python 3.11.6**. The screenshot doesn't get
+**This app is using Flask 3.0.0 and Python 3.12.1**. The screenshot doesn't get
 updated every time I bump the versions:
 
 [![Screenshot](.github/docs/screenshot.jpg)](https://github.com/nickjj/docker-flask-example/blob/main/.github/docs/screenshot.jpg?raw=true)

hello/app.py

@@ -1,4 +1,5 @@
 from celery import Celery
+from celery import Task
 from flask import Flask
 from werkzeug.debug import DebuggedApplication
 from werkzeug.middleware.proxy_fix import ProxyFix
@@ -20,18 +21,15 @@ def create_celery_app(app=None):
     """
     app = app or create_app()
 
-    celery = Celery(app.import_name)
-    celery.conf.update(app.config.get("CELERY_CONFIG", {}))
-    TaskBase = celery.Task
-
-    class ContextTask(TaskBase):
-        abstract = True
-
-        def __call__(self, *args, **kwargs):
+    class FlaskTask(Task):
+        def __call__(self, *args: object, **kwargs: object) -> object:
             with app.app_context():
-                return TaskBase.__call__(self, *args, **kwargs)
+                return self.run(*args, **kwargs)
 
-    celery.Task = ContextTask
+    celery = Celery(app.import_name, task_cls=FlaskTask)
+    celery.conf.update(app.config.get("CELERY_CONFIG", {}))
+    celery.set_default()
+    app.extensions["celery"] = celery
 
     return celery