Celery integration overview in Flask - Mini Project: Build & Apply

Celery Integration Overview with Flask

📖 Scenario: You are building a simple Flask web application that needs to perform background tasks without making users wait. To do this, you will integrate Celery, a tool that helps run tasks in the background.

🎯 Goal: Build a Flask app with Celery integration that can send a background task to add two numbers and return the result asynchronously.

📋 What You'll Learn

Create a Flask app instance

Set up Celery with Flask configuration

Define a simple Celery task to add two numbers

Trigger the Celery task from Flask

💡 Why This Matters

🌍 Real World

Background tasks like sending emails, processing images, or running long calculations without blocking the web server.

💼 Career

Understanding Celery integration is important for backend developers working with Flask to build scalable and responsive web applications.

1

Create Flask app instance

Create a Flask app instance called app using Flask(__name__).

Flask

# Your code here

Need a hint?

Use Flask(__name__) to create the app instance.

2

Configure Celery with Flask settings

Create a Celery instance called celery and configure it with the Flask app's broker URL app.config['CELERY_BROKER_URL'] = 'redis://localhost:6379/0'.

Flask

from celery import Celery

# Your code here

Need a hint?

Set app.config['CELERY_BROKER_URL'] before creating the Celery instance.

3

Define a Celery task to add two numbers

Define a Celery task called add using the @celery.task decorator that takes two arguments x and y and returns their sum.

Flask

# Your code here

Need a hint?

Use @celery.task to decorate the function add.

4

Trigger the Celery task from Flask route

Create a Flask route /add that calls the Celery task add.delay(4, 6) and returns the task id as a string.

Flask

# Your code here

Need a hint?

Use @app.route('/add') to create the route and call add.delay(4, 6) inside the function.