mirror of https://github.com/rwf2/Rocket.git
99 lines
2.7 KiB
Markdown
99 lines
2.7 KiB
Markdown
# Getting Started
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Let's create and run our first Rocket application. We'll ensure we have a
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compatible version of Rust, create a new Cargo project that depends on Rocket,
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and then run the application.
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## Installing Rust
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Rocket makes abundant use of Rust's syntax extensions and other advanced,
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unstable features. Because of this, we'll need to use a nightly version of Rust.
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If you already have a working installation of the latest Rust nightly, feel free
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to skip to the next section.
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To install a nightly version of Rust, we recommend using `rustup`. Install
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`rustup` by following the instructions on [its website](https://rustup.rs/).
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Once `rustup` is installed, configure Rust nightly as your default toolchain by
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running the command:
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```sh
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rustup default nightly
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```
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If you prefer, once we setup a project directory in the following section, you
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can use per-directory overrides to use the nightly version _only_ for your
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Rocket project by running the following command in the directory:
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```sh
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rustup override set nightly
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```
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### Minimum Nightly
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Rocket always requires the _latest_ version of Rust nightly. If your Rocket
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application suddenly stops building, ensure you're using the latest version of
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Rust nightly and Rocket by updating your toolchain and dependencies with:
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```sh
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rustup update && cargo update
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```
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## Hello, world!
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Let's write our first Rocket application! Start by creating a new binary-based
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Cargo project and changing into the new directory:
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```sh
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cargo new hello-rocket --bin
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cd hello-rocket
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```
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Now, add Rocket and its code generation facilities as dependencies of your
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project by ensuring your `Cargo.toml` contains the following:
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```
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[dependencies]
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rocket = "0.3.15"
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rocket_codegen = "0.3.15"
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```
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Modify `src/main.rs` so that it contains the code for the Rocket `Hello, world!`
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program, reproduced below:
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```rust
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#![feature(plugin)]
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#![plugin(rocket_codegen)]
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extern crate rocket;
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#[get("/")]
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fn index() -> &'static str {
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"Hello, world!"
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}
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fn main() {
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rocket::ignite().mount("/", routes![index]).launch();
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}
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```
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We won't explain exactly what the program does now; we leave that for the rest
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of the guide. In short, it creates an `index` route, _mounts_ the route at the
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`/` path, and launches the application. Compile and run the program with `cargo
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run`. You should see the following:
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```sh
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🔧 Configured for development.
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=> address: localhost
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=> port: 8000
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=> log: normal
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=> workers: [core count * 2]
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=> secret key: generated
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=> limits: forms = 32KiB
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=> tls: disabled
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🛰 Mounting '/':
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=> GET /
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🚀 Rocket has launched from http://localhost:8000
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```
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Visit `http://localhost:8000` to see your first Rocket application in action!
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