mirror of https://github.com/rwf2/Rocket.git
101 lines
2.8 KiB
Markdown
101 lines
2.8 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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! warning: Rocket requires the _latest_ version of Rust nightly.
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If your Rocket application suddenly stops building, ensure you're using the
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latest version of Rust nightly and Rocket by updating your toolchain and
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dependencies with:
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`rustup update && cargo update`
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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 as a dependency in your `Cargo.toml`:
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```toml
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[dependencies]
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rocket = "0.5.0-dev"
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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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#[macro_use] 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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#[rocket::launch]
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fn rocket() -> rocket::Rocket {
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rocket::ignite().mount("/", routes![index])
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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: [logical cores * 2]
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=> secret key: generated
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=> limits: forms = 32KiB
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=> keep-alive: 5s
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=> tls: disabled
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🛰 Mounting '/':
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=> GET / (index)
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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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! tip: Don't like colors or emoji?
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You can disable colors and emoji by setting the `ROCKET_CLI_COLORS`
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environment variable to `0` or `off` when running a Rocket binary:
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`ROCKET_CLI_COLORS=off cargo run`
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