Book Image

Network Programming with Rust

By : Abhishek Chanda
Book Image

Network Programming with Rust

By: Abhishek Chanda

Overview of this book

Rust is low-level enough to provide fine-grained control over memory while providing safety through compile-time validation. This makes it uniquely suitable for writing low-level networking applications. This book is divided into three main parts that will take you on an exciting journey of building a fully functional web server. The book starts with a solid introduction to Rust and essential networking concepts. This will lay a foundation for, and set the tone of, the entire book. In the second part, we will take an in-depth look at using Rust for networking software. From client-server networking using sockets to IPv4/v6, DNS, TCP, UDP, you will also learn about serializing and deserializing data using serde. The book shows how to communicate with REST servers over HTTP. The final part of the book discusses asynchronous network programming using the Tokio stack. Given the importance of security for modern systems, you will see how Rust supports common primitives such as TLS and public-key cryptography. After reading this book, you will be more than confident enough to use Rust to build effective networking software
Table of Contents (11 chapters)

Introduction to coroutines and generators

We looked into the Tokio ecosystem earlier. We saw how it is very common to chain futures in Tokio, yielding a larger task that can then be scheduled as necessary. In practice, the following often looks like the pseudocode:

fn download_parse(url: &str) {
let task = download(url)
.and_then(|data| parse_html(data))
.and_then(|link| process_link(link))
.map_err(|e| OurErr(e));;

Here, our function takes in a URL and recursively downloads raw HTML. It then parses and collects links in the document. Our task is run in an event loop. Arguably, the control flow here is harder to follow, due to all the callbacks and how they interact. This becomes more complex with larger tasks and more conditional branches.

The idea of coroutines helps us to better reason about non-linearity in...