Book Image

Rust Programming By Example

By : Guillaume Gomez, Antoni Boucher
Book Image

Rust Programming By Example

By: Guillaume Gomez, Antoni Boucher

Overview of this book

Rust is an open source, safe, concurrent, practical language created by Mozilla. It runs blazingly fast, prevents segfaults, and guarantees safety. This book gets you started with essential software development by guiding you through the different aspects of Rust programming. With this approach, you can bridge the gap between learning and implementing immediately. Beginning with an introduction to Rust, you’ll learn the basic aspects such as its syntax, data types, functions, generics, control flows, and more. After this, you’ll jump straight into building your first project, a Tetris game. Next you’ll build a graphical music player and work with fast, reliable networking software using Tokio, the scalable and productive asynchronous IO Rust library. Over the course of this book, you’ll explore various features of Rust Programming including its SDL features, event loop, File I/O, and the famous GTK+ widget toolkit. Through these projects, you’ll see how well Rust performs in terms of concurrency—including parallelism, reliability, improved performance, generics, macros, and thread safety. We’ll also cover some asynchronous and reactive programming aspects of Rust. By the end of the book, you’ll be comfortable building various real-world applications in Rust.
Table of Contents (18 chapters)
Title Page
Copyright and Credits
Packt Upsell
Events and Basic Game Mechanisms

Uploading files

Now, let's do the opposite command: STOR to upload a file on the server.

As always, we'll add a case in the handle_cmd() method:

fn handle_cmd(mut self, cmd: Command) -> Result<Self> {
    match cmd {
        Command::Stor(file) => self = await!(self.stor(file))?,
        // …

Here is the start of the corresponding method:

use std::io::Write;

fn stor(mut self, path: PathBuf) -> Result<Self> {
    if self.data_reader.is_some() {
        if invalid_path(&path) {
            let error: io::Error = io::ErrorKind::PermissionDenied.into();
            return Err(error.into());
        let path = self.cwd.join(path);
        self = await!(self.send(Answer::new(ResultCode::DataConnectionAlreadyOpen, 
         "Starting to send file...")))?;

Once again, we check that the data channel is opened. Then, we use a new function to check that the path is valid, by which we mean it does not contain ... In the other cases, we used another...