Book Image

Rust Standard Library Cookbook

By : Jan Hohenheim, Daniel Durante
Book Image

Rust Standard Library Cookbook

By: Jan Hohenheim, Daniel Durante

Overview of this book

Mozilla’s Rust is gaining much attention with amazing features and a powerful library. This book will take you through varied recipes to teach you how to leverage the Standard library to implement efficient solutions. The book begins with a brief look at the basic modules of the Standard library and collections. From here, the recipes will cover packages that support file/directory handling and interaction through parsing. You will learn about packages related to advanced data structures, error handling, and networking. You will also learn to work with futures and experimental nightly features. The book also covers the most relevant external crates in Rust. By the end of the book, you will be proficient at using the Rust Standard library.
Table of Contents (12 chapters)

How it works...

This recipe begins like the last one, so let's skip straight into the definition of our Service[14 to 22]:

|req: Request| {
match (req.method(), req.path()) {
(&Method::Get, "/") => handle_root(),
(&Method::Post, "/echo") => handle_echo(req),
_ => handle_not_found(),

We are now using the Request parameter that the last recipe simply ignored.

Because Rust allows us to pattern match on tuples, we can directly differentiate between HTTP methods and path combinations. We then pass on the control flow of our program to dedicated route handlers, which in turn are responsible for returning the response.

In bigger programs with tons of routes, we would not specify them all in one function, but spread them across namespaces and split them into subrouters.

The code for handle_root [29] looks nearly identical to the hello world Service from the last chapter, but instructs the caller to POST at the /post route...