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
Part 1:Getting Started with Rust Web Development
Part 2:Processing Data and Managing Displays
Part 3:Data Persistence
Part 4:Testing and Deployment
Part 5:Making Our Projects Flexible
Part 6:Exploring Protocol Programming and Async Concepts with Low-Level Network Applications

Exploring the Tokio framework for async programming

Before we explore what Tokio is and how it works, we should try to execute some async code in normal Rust. Throughout this chapter, we will be building a basic simulation using Tokio. Therefore, the Tokio code that we will be writing is in the simulation directory as its own Cargo project. Seeing as we are running async functions in our Rust server code to process views, we can see if we can execute a basic async function in our main function in the file with the following code:

async fn hello() {
    println!("Hello, world!");
fn main() {

This looks simple enough; however, if we try to run our main function, we get the following output:

warning: unused implementer of `Future` that must be used
 --> src/
9 |     hello();
  |     ^^^^^^^^