Created
July 4, 2024 19:55
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Working actix-gcd source code for Programming Rust (build with `actix-web = "4"`)
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| use serde::Deserialize; | |
| use actix_web::{web, App, HttpResponse, HttpServer}; | |
| fn gcd(mut n: u64, mut m: u64) -> u64 { | |
| assert!(n != 0 && m != 0); | |
| while m != 0 { | |
| if m < n { | |
| let t = m; | |
| m = n; | |
| n = t; | |
| } | |
| m = m % n; | |
| } | |
| n | |
| } | |
| #[derive(Deserialize)] | |
| struct GcdParameters { | |
| n: u64, | |
| m: u64, | |
| } | |
| #[actix_web::main] | |
| async fn main() { | |
| let server = HttpServer::new(|| { | |
| App::new() | |
| .route("/", web::get().to(get_index)) | |
| .route("/gcd", web::post().to(post_gcd)) | |
| }); | |
| println!("Serving on http://localhost:3000..."); | |
| server | |
| .bind("127.0.0.1:3000") | |
| .expect("error binding server to address") | |
| .run() | |
| .await | |
| .expect("server error"); | |
| } | |
| async fn get_index() -> HttpResponse { | |
| HttpResponse::Ok() | |
| .content_type("text/html") | |
| .body( | |
| r#" | |
| <title>GCD Calculator</title> | |
| <form action="/gcd" method="post"> | |
| <input type="text" name="n"/> | |
| <input type="text" name="m"/> | |
| <button type="submit">Compute GCD</button> | |
| </form> | |
| "#, | |
| ) | |
| } | |
| async fn post_gcd(form: web::Form<GcdParameters>) -> HttpResponse { | |
| if form.n == 0 || form.m == 0 { | |
| return HttpResponse::BadRequest() | |
| .content_type("text/html") | |
| .body("Computing the GCD with zero is boring."); | |
| } | |
| let response = | |
| format!("The greatest common divisor of the numbers {} and {} \ | |
| is <b>{}</b>\n", | |
| form.n, form.m, gcd(form.n, form.m)); | |
| HttpResponse::Ok() | |
| .content_type("text/html") | |
| .body(response) | |
| } |
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