Book Image

Django 4 By Example - Fourth Edition

By : Antonio Melé
4.7 (3)
Book Image

Django 4 By Example - Fourth Edition

4.7 (3)
By: Antonio Melé

Overview of this book

Django 4 By Example is the 4th edition of the best-selling franchise that helps you build web apps. This book will walk you through the creation of real-world applications, solving common problems, and implementing best practices using a step-by-step approach. You'll cover a wide range of web app development topics as you build four different apps: A blog application: Create data models, views, and URLs and implement an admin site for your blog. Create sitemaps and RSS feeds and implement a full-text search engine with PostgreSQL. A social website: Implement authentication with Facebook, Twitter, and Google. Create user profiles, image thumbnails, a bookmarklet, and an activity stream. Implement a user follower system and add infinite scroll pagination to your website. An e-commerce application: Build a product catalog, a shopping cart, and asynchronous tasks with Celery and RabbitMQ. Process payments with Stripe and manage payment notifications via webhooks. Build a product recommendation engine with Redis. Create PDF invoices and export orders to CSV. An e-learning platform: Create a content management system to manage polymorphic content. Cache content with Memcached and Redis. Build and consume a RESTful API. Implement a real-time chat using WebSockets with ASGI. Create a production environment using NGINX, uWSGI and Daphne with Docker Compose. This is a practical book that will have you creating web apps quickly.
Table of Contents (20 chapters)
18
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19
Index

Asynchronous tasks

When receiving an HTTP request, you need to return a response to the user as quickly as possible. Remember that in Chapter 7, Tracking User Actions, you used the Django Debug Toolbar to check the time for the different phases of the request/response cycle and the execution time for the SQL queries performed. Every task executed during the course of the request/response cycle adds up to the total response time. Long-running tasks can seriously slow down the server response. How do we return a fast response to the user while still completing time-consuming tasks? We can do it with asynchronous execution.

Working with asynchronous tasks

We can offload work from the request/response cycle by executing certain tasks in the background. For example, a video-sharing platform allows users to upload videos but requires a long time to transcode uploaded videos. When the user uploads a video, the site might return a response informing that the transcoding will start...