i am learning from this pdf book "hands-on microservices with rust: build, test, and deploy scalable and reactive microservices with rust 2018"
Code doesn't work so I use google to do some search and I am in problem.
if you find any learning guide of rust by example please share it.
this Book I little older and codes does not work with new rust versions.
use hyper::server::conn::AddrStream;
use hyper::service::{make_service_fn, service_fn};
use hyper::{Body, Request, Response, Server, StatusCode};
use std::convert::Infallible;
use std::net::SocketAddr;
use std::sync::{Arc, Mutex};
use slab::Slab;
use hyper::http::Method;
// use serde_json;
const INDEX: &'static str = r#"
<h1>Hi\n</h1>
<p>I love this\n</p>
"#;
type UserId = u64;
#[derive(Debug, Copy, Clone)]
struct UserData;
type UserDb = Arc<Mutex<UserData>>;
type UserDb12 = Arc<Mutex<i32>>;
const USER_PATH: &str = "/user/";
async fn handle(
context: AppContext,
addr: SocketAddr,
req: Request<Body>,
user_db: &UserDb,
) -> Result<Response<Body>, Infallible> {
// println!("{:?}", serde_json::from_slice(req.body()));
// let body = req.body().concat2().wait().unwrap().into_bytes();
// let s = serde_json::from_slice(&body).unwrap();
// println!("{:?}",s);
println!("{:?}", req);
match (req.method(), req.uri().path()) {
(&Method::GET, "/") => {
// Ok(INDEX.into())
Ok(Response::new(Body::from("<h1>this is rust 4.0</h1>")))
},
(&Method::GET, "/love") => {
// Ok(INDEX.into())
Ok(Response::new(Body::from("Why do i love you.?")))
},
(&Method::GET, "/index") => {
// Ok(INDEX.into())
Ok(Response::new(Body::from(INDEX)))
},
(method, path) if path.starts_with(USER_PATH) => {
println!("Unimplemented");
// Ok(Response::new(Body::from("Not implementd")))
let user_id = path.trim_start_matches(USER_PATH)
.parse::<UserId>()
.ok()
.map(|x| x as usize);
// unimplemented!();
Ok(Response::new(Body::from("user_id")))
},
_ => {
let response = Response::builder()
.status(StatusCode::NOT_FOUND)
.body(Body::from("404"))
.unwrap();
Ok(response)
}
}
// Ok(Response::new(Body::from("this is rust 4.0")))
}
#[derive(Clone)]
#[derive(Debug)]
struct AppContext {
// Whatever data your application needs can go here
}
#[tokio::main]
async fn main() {
let context = AppContext {
// ...
};
let ko: &str = "I am here";
println!("{}", ko);
// let slab = Slab::new();
let mut s = 4;
let user_db = Arc::new(Mutex::new(UserData));
// A `MakeService` that produces a `Service` to handle each connection.
let make_service = make_service_fn(move |conn: &AddrStream| {
let context = context.clone();
let user_db = user_db.clone();
let addr = conn.remote_addr();
let service = service_fn(move |req| {
handle(context.clone(), addr, req, &user_db)
});
async move { Ok::<_, Infallible>(service) }
});
// run the server like above...
let addr = SocketAddr::from(([127, 0, 0, 1], 3000));
let server = Server::bind(&addr).serve(make_service);
if let Err(e) = server.await {
eprintln!("server error: {:?}", e);
}
}
Error
error: captured variable cannot escape `FnMut` closure body
--> src/main.rs:101:13
|
97 | let user_db = user_db.clone();
| ------- variable defined here
...
100 | let service = service_fn(move |req| {
| - inferred to be a `FnMut` closure
101 | handle(context.clone(), addr, req, &user_db)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-------^
| | |
| | variable captured here
| returns a reference to a captured variable which escapes the closure body
|
= note: `FnMut` closures only have access to their captured variables while they are executing...
= note: ...therefore, they cannot allow references to captured variables to escape