Book Image

Rust Web Programming - Second Edition

By : Maxwell Flitton
5 (1)
Book Image

Rust Web Programming - Second Edition

5 (1)
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

Building our unit tests

In this section, we will explore the concept of unit tests and how to build unit test modules that contain tests as functions. Here, we are not going to achieve 100% unit test coverage for our application. There are places in our application that can be covered by our functional tests, such as API endpoints and JSON serialization. However, unit tests are still important in some parts of our application.

Unit tests enable us to look at some of our processes in more detail. As we saw with our logging in Chapter 8, Building RESTful Services, a functional test might work the way we want it to end-to-end, but there might be edge cases and behaviors that we do not want. This was seen in the previous chapter, where we saw our application make two GET calls when one was enough.

In our unit tests, we will break down the processes one by one, mock certain parameters, and test the outcomes. These tests are fully isolated. The advantage of this is that we get to test...