Build a Website Using Rust and the Rocket Web Framework

Rust is a functional programming language noted for its high performance and capabilities in systems programming. However, with the Rocket framework, you can also use Rust for building full-functioning — and efficient — web applications.

This guide explains what Rocket is, shows you how to install it, and gets you started using it to create your own website.

What is Rocket?

Rocket is a framework for building web applications with the Rust programming language. Rust itself is noted for its type-safety and speediness, and Rocket aims to leverage those attributes to make secure and efficient web applications.

Beyond that, Rocket emphasizes an easy and minimalistic path to putting together the web application you need. It uses simple and intuitive APIs, and Rocket does its job without all of the boilerplate code. Moreover, it is an extensible framework designed for flexibility.

Before You Begin

If you have not already done so, create a Linode account and Compute Instance. See our Getting Started with Linode and Creating a Compute Instance guides.
Follow our Setting Up and Securing a Compute Instance guide to update your system. You may also wish to set the timezone, configure your hostname, create a limited user account, and harden SSH access.
Throughout, this guide uses example-app as the name of the Rocket application. Replace it with your preferred application name.

Note

This guide is written for non-root users. Commands that require elevated privileges are prefixed with sudo. If you’re not familiar with the sudo command, see the Users and Groups guide.

Install Rust

Rocket makes use of some of Rust’s more cutting-edge features. As such, you need to install the nightly build of Rust to make sure Rocket works correctly.

Install rustup, an installer for Rust. Follow the prompts the installation script presents.
```
 curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
```
If you do not already have Curl installed, use this command to install it first:
```
 sudo apt install curl
```
Log out and log back in or run the following command to load the necessary executables into your Bash path:
```
 source $HOME/.cargo/env
```
Set nightly as your default Rust version:
```
 rustup default nightly
```
Alternatively, you can set the nightly release as your default for a specific project. Once you create a project (like in the steps below) run the following command in the project directory to have it use the nightly build:
```
 rust override set nightly
```

Getting Started with Rocket

In this section, you complete the following steps:

Download and explore Rocket’s example applications
Create your own Rocket application

Example Applications

Use Git to clone the Rocket repository. For this example, the repository is cloned into the current user’s home directory.
```
 cd ~
 git clone https://github.com/SergioBenitez/Rocket
```
If you do not already have Git, install it first with the following command:
```
 sudo apt install git
```
Change into the resulting Rocket directory, and check out the latest version. You can refer to Rocket’s releases page to see the latest version.
```
 cd Rocket
 git checkout v0.4.7
```
Look through the examples directory for an example you would like to explore. When you have found one, change into its directory. Here, the hello_world example is chosen.
```
 cd examples/hello_world
```
Run the example:
```
 cargo run
```
Rocket serves the application on localhost port 8000. To visit the application remotely, you can use an SSH tunnel:
- On Windows, you can use the PuTTY tool to set up your SSH tunnel. Follow the appropriate section of the Using SSH on Windows guide, replacing the example port number there with 8000.
- On macOS or Linux, use the following command to set up the SSH tunnel. Replace example-user with your username on the application server and 192.0.2.0 with the server’s IP address:
```
  ssh -L8000:localhost:8000 example-user@192.0.2.0
```
Now, you can visit the application in your browser by navigating to localhost:8000.

Create an Application

Change to the location where you would like the project directory to be created. In this case, this is the current user’s home directory.
```
 cd ~
```
Create a new binary-based Rust project, then change into the new directory you created for it.
```
 cargo new example-app --bin
 cd example-app
```
Unless noted otherwise, all subsequent commands in this guide assume you are still in the application directory.
Open the Cargo.toml file, and add Rocket as a dependency for the project. Use the version number for the latest version of Rocket. Refer to the Example Applications section above for how to identify the latest Rocket release.
File: ~/example-app/Cargo.toml
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# [...] [dependencies] rocket = "0.4.7"

Open the src/main.rs file, and populate it with the following lines:

File: ~/example-app/src/main.rs

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#![feature(proc_macro_hygiene, decl_macro)]

#[macro_use] extern crate rocket;

#[get("/")]
fn index() -> &'static str {
    "Hello, world!"
}

fn main() {
    rocket::ignite().mount("/", routes![index]).launch();
}
    

You have now created a basic “Hello, World!” application, which you can test by using the cargo run command as shown in the Example Applications section above.

Build a Website with Rocket

Rocket can easily be set up to provide web service APIs based on the above example and referring to the official Rocket documentation.

Pairing Rocket with a template engine like Handlebars makes it ready to run a full website. The steps below show you how to do just that and set you up with the foundations for going off and building your own templates.

Follow the steps in the Create an Application section above to create a base Rocket application to work off.

Open the project’s Cargo.toml, and modify with the additional lines in the example below:

File: ~/example-app/Cargo.toml

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# [...]

[dependencies]
rocket = "0.4.7"
serde = { version = "1.0", features = ["derive"] }

[dependencies.rocket_contrib]
version = "*"
default-features = false
features = ["handlebars_templates"]
    

This adds serde, which comes with some typing features the application needs,as a dependency. The rocket_contrib section allows Handlebars to be identified as a feature that the project uses.

Open your ~/example-app/src/main.rs file, and modify it to include the following code:

File: ~/example-app/src/main.rs

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#![feature(proc_macro_hygiene, decl_macro)]

#[macro_use] extern crate rocket;

use rocket::response::Redirect;
use rocket_contrib::templates::Template;

#[derive(serde::Serialize)]
struct Message {
    user: &'static str,
    body: &'static str
}

#[derive(serde::Serialize)]
struct BoardContext {
    current_user: Option<String>,
    messages: Vec<Message>,
    parent: &'static str
}

#[derive(serde::Serialize)]
struct AboutContext {
    parent: &'static str
}

#[get("/")]
fn index() -> Redirect {
    Redirect::to("/user/anonymous")
}

#[get("/user/<username>")]
fn board(username: String) -> Template {
    Template::render("index", &BoardContext {
        current_user: Some(username),
        messages: vec![Message{user: "userA", body: "This is the first test message."},
                        Message{user: "userB", body: "This is the second test message."}],
        parent: "layout"
    })
}

#[get("/about")]
fn about() -> Template {
    Template::render("about", &AboutContext {
        parent: "layout"
    })
}
    

This creates a Message struct, defining the basic shape for messages. The BoardContext and AboutContext structs determine “context” information to be handed off to the templates. Each context struct has a parent attribute. The application uses these attributes in the board and about functions to apply the appropriate page layout for each page.
These two functions are where the application loads the Message board and the About pages, respectively. They populate the context information and render the templates with it.
The application also uses a redirect to navigate users from the base URL (/) to the message board URL.

Create a template directory.
```
 mkdir templates
```

Create the five template files shown below.

The layout.hbs file defines the page layout used on each page. Using the parent attribute defined in the main.rs file’s context structs, you could also have different layouts for different sections of your site.

File: ~/example-app/templates/layout.hbs

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<!doctype html>
<html>
  <head>
    <title>Example App - Message Board</title>
  </head>
  <body>
    {{> header}}
    {{~> page}}
    {{> footer}}
  </body>
</html>
    

The header.hbs and footer.hbs files provide contents for those sections. These are directly referenced in the page layout file, so they appear on each page of your site that uses that page layout.

File: ~/example-app/templates/header.hbs

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<nav>
  <a href="/">Message Board</a> | <a href="/about">About</a>
</nav>
    

File: ~/example-app/templates/footer.hbs

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<footer>
  Built with Rust and the Rocket framework.
</footer>
    

The index.hbs file defines the way your main page — in this case, the Message board — gets laid out.

File: ~/example-app/templates/index.hbs

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{{#*inline "page"}}

<section id="message_board">
  <h1>Hi, {{ current_user }}!</h1>
  You can login as a different user by navigating to "/user/{username}".

  <h2>Messages</h2>
  <ul>
    {{#each messages}}
      <li>{{ this.user }}: {{ this.body }}</li>
    {{/each}}
  </ul>
</section>

{{/inline}}
{{~> (parent)~}}
    

The about.hbs provides the contents for the about page.

File: ~/example-app/templates/about.hbs

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{{#*inline "page"}}

<section id="about">
  <h1>About</h1>
  This is an example web application built with Rust and the Rocket framework.
</section>

{{/inline}}
{{~> (parent)~}}
    

Now you can run the application using the cargo run command as shown in the Example Applications section above.

Conclusion

After completing this guide, you should have a solid understanding of how to get started using Rocket to make web applications. Rust and Rocket are highly capable and have a lot to offer with their functional approach, high performance, and efficient design.

Check out the Rocket’s full guide to learn more about the features it offers. Take a look at the Handlebars language guide, too, if you are interested in doing more with templates in Rocket.

To continue learning more about the Rust programming language, check out the resources linked on Rust’s learning page, which include both The Rust Book and a Rust course.

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