Book Image

Rust Web Programming - Second Edition

By : Maxwell Flitton
Book Image

Rust Web Programming - Second Edition

By: Maxwell Flitton

Overview of this book

Are safety and high performance a big concern for you while developing web applications? With this practical Rust book, you’ll discover how you can implement Rust on the web to achieve the desired performance and security as you learn techniques and tooling to build fully operational web apps. In this second edition, you’ll get hands-on with implementing emerging Rust web frameworks, including Actix, Rocket, and Hyper. It also features HTTPS configuration on AWS when deploying a web application and introduces you to Terraform for automating the building of web infrastructure on AWS. What’s more, this edition also covers advanced async topics. Built on the Tokio async runtime, this explores TCP and framing, implementing async systems with the actor framework, and queuing tasks on Redis to be consumed by a number of worker nodes. Finally, you’ll go over best practices for packaging Rust servers in distroless Rust Docker images with database drivers, so your servers are a total size of 50Mb each. By the end of this book, you’ll have confidence in your skills to build robust, functional, and scalable web applications from scratch.
Table of Contents (27 chapters)
Free Chapter
1
Part 1:Getting Started with Rust Web Development
4
Part 2:Processing Data and Managing Displays
8
Part 3:Data Persistence
12
Part 4:Testing and Deployment
16
Part 5:Making Our Projects Flexible
19
Part 6:Exploring Protocol Programming and Async Concepts with Low-Level Network Applications

Getting our configuration from environment variables

So far, we have been loading configuration variables from YML files. This has a few issues. First, we must move these files around where our deployment is. Also, files do not work efficiently with orchestration tools such as Kubernetes. Kubernetes uses ConfigMaps, which essentially define environment variables for each container they are running. Environment variables also work well with tools such as Secret Manager and AWS credentials. We can also directly overwrite the environment variables in docker-compose. With all these advantages in mind, we will switch our configuration values from files to environment variables. To map where we have implemented configuration variables from a file, all we must do is delete our src/config.rs file and the module declaration of that config module in the main.rs file. Then, we can run the cargo test command again to get the following output:

--> src/database.rs:12:12
   ...