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)

Awaiting the future

In the last section, we saw how tasks composed of multiple futures are often difficult to write and debug. One attempt at remedying this is using a crate that wraps futures and associated error handling, yielding a more linear flow of code. This crate is called futures-await and is under active development.

This crate provides two primary mechanisms of dealing with futures:

  • The #[async] attribute that can be applied to functions, marking them as asynchronous. These functions must return the Result of their computation as a future.
  • The await! macro that can be used with async functions to consume the future, returning a Result.

Given these constructions, our earlier example download will look like this:

#[async]
fn download(url: &str) -> io::Result<Data> {
...
}

#[async]
fn parse_html(data: &Data) -> io::Result<Links> {
...
}

#[async...