hello-world.rs

// Copyright (c) 2016 The Rouille developers
// Licensed under the Apache License, Version 2.0
// <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT
// license <LICENSE-MIT or http://opensource.org/licenses/MIT>,
// at your option. All files in the project carrying such
// notice may not be copied, modified, or distributed except
// according to those terms.

#[macro_use]
extern crate rouille;

fn main() {
    println!("Now listening on localhost:8000");

    // The `start_server` starts listening forever on the given address.
    rouille::start_server("localhost:8000", move |request| {
        // The closure passed to `start_server` will be called once for each client request. It
        // will be called multiple times concurrently when there are multiple clients.

        // Here starts the real handler for the request.
        //
        // The `router!` macro is very similar to a `match` expression in core Rust. The macro
        // takes the request as parameter and will jump to the first block that matches the
        // request.
        //
        // Each of the possible blocks builds a `Response` object. Just like most things in Rust,
        // the `router!` macro is an expression whose value is the `Response` built by the block
        // that was called. Since `router!` is the last piece of code of this closure, the
        // `Response` is then passed back to the `start_server` function and sent to the client.
        router!(request,
            (GET) (/) => {
                // If the request's URL is `/`, we jump here.
                // This block builds a `Response` object that redirects to the `/hello/world`.
                rouille::Response::redirect_302("/hello/world")
            },

            (GET) (/hello/world) => {
                // If the request's URL is `/hello/world`, we jump here.
                println!("hello world");

                // Builds a `Response` object that contains the "hello world" text.
                rouille::Response::text("hello world")
            },

            (GET) (/panic) => {
                // If the request's URL is `/panic`, we jump here.
                //
                // This block panics. Fortunately rouille will automatically catch the panic and
                // send back a 500 error message to the client. This prevents the server from
                // closing unexpectedly.
                panic!("Oops!")
            },

            (GET) (/{id: u32}) => {
                // If the request's URL is for example `/5`, we jump here.
                //
                // The `router!` macro will attempt to parse the identfier (eg. `5`) as a `u32`. If
                // the parsing fails (for example if the URL is `/hello`), then this block is not
                // called and the `router!` macro continues looking for another block.
                println!("u32 {:?}", id);

                // For the same of the example we return an empty response with a 400 status code.
                rouille::Response::empty_400()
            },

            (GET) (/{id: String}) => {
                // If the request's URL is for example `/foo`, we jump here.
                //
                // This route is similar to the previous one, but this time we have a `String`.
                // Parsing into a `String` never fails.
                println!("String {:?}", id);

                // Builds a `Response` object that contains "hello, " followed with the value
                // of `id`.
                rouille::Response::text(format!("hello, {}", id))
            },

            // The code block is called if none of the other blocks matches the request.
            // We return an empty response with a 404 status code.
            _ => rouille::Response::empty_404()
        )
    });
}