Building Web API's With Rust 2

First, let’s add the library responsible for routes.

Cargo.toml

[dependencies]
hyper = "0.12"
futures = "0.1"
pretty_env_logger = "0.3"
log = "0.4"
reset-router = "0.7"

Our main.rs should now look like this

use hyper::{Body, Method, Server};
use futures::{Future};

use std::env;

extern crate pretty_env_logger;
#[macro_use] extern crate log;

extern crate reset_router;

use reset_router::{Router, Request, Response};

fn index(_req: Request) -> Result<Response, Response> {
    Ok(Response::new(Body::from("ok")))
}

fn main() {
    env::set_var("RUST_LOG", "app=debug");
    env::set_var("RUST_BACKTRACE", "1");
    pretty_env_logger::init();

    let addr = "0.0.0.0:3000".parse().unwrap();

    let router = Router::build()
        .add(Method::GET, r"/$", index)
        .finish()
        .unwrap();

    let server = Server::bind(&addr)
        .serve(router)
        .map_err(|e| eprintln!("server error: {}", e));

    info!("Listening on http://{}", addr);
    hyper::rt::run(server);
}


#[cfg(test)]
mod tests {
    extern crate speculate;
    extern crate reqwest as request;    
    
    use hyper::StatusCode;
    use speculate::speculate;    
    use std::thread;
    use std::sync::Once;

    use super::main;

    static SETUP: Once = Once::new();    

    speculate! {      
        before {
            SETUP.call_once(|| {
                let _main_server = thread::spawn(main);
            });
        }

        describe "main server routes" {
            it "calls the root path and returns 200" {
                let resp = request::get("http://0.0.0.0:3000").unwrap();
                assert!(resp.status().is_success());
            }

            it "calls an inexistent route and returns 404" {
                let resp = request::get("http://0.0.0.0:3000/notfound").unwrap();
                assert!(resp.status().is_client_error());
                assert_eq!(resp.status(), StatusCode::NOT_FOUND);
            }
        }
    }
}

We removed some type aliases and now we have a regex based router, the library also takes care of the 404. The tests that we had are still the same after this refactoring ;)

running 2 tests
 INFO  app > Listening on http://0.0.0.0:3000
test tests::speculate_0::main_server_routes::test_calls_the_root_path_and_returns_200 ... ok
test tests::speculate_0::main_server_routes::test_calls_an_inexistent_route_and_returns_404 ... ok

test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out