Add a few more comments

use actix_web::{web, App, HttpRequest, HttpResponse, HttpServer, Responder};

use actix_web_actors::ws;

/// Serve `index.html` for path `/`.

async fn index(cfg: web::Data<Config>) -> Result<NamedFile, actix_web::Error> {

    let full_path = cfg.static_files.join("index.html");

    Ok(file.use_last_modified(true))

}

/// Create Subscriber/Publisher WebSocket actors.

async fn ws(

    cfg: web::Data<Config>,

    rooms: web::Data<Addr<Rooms>>,

    }

}

/// Serve static files (`index.html`, JavaScript, CSS, etc).

async fn static_file(

    cfg: web::Data<Config>,

    req: HttpRequest,

    Ok(file.use_last_modified(true))

}

/// Start the server based on the passed `Config`.

pub async fn run(cfg: Config) -> Result<(), anyhow::Error> {

    let rooms = Rooms::new().start();

    let server = HttpServer::new(move || {

        App::new()

            .app_data(cfg_clone.clone())

            .data(cfg_clone.clone())

            .data(rooms.clone())

            .route("/", web::get().to(index))

            .route("/ws/{mode:(publish|subscribe)}", web::get().to(ws))