getting the port of a random port binding

[davehorner]

let mut addr: String = CFG.server.address.parse().unwrap();
if is_port_in_use(&addr) {
    addr = "0.0.0.0:0".to_string();
    println!("Port is in use {}, {}",CFG.server.address, addr);
} else {
    println!("Port is available {}",CFG.server.address);
}

let acceptor = TcpListener::new(&addr).bind().await;
let server = Server::new(acceptor);
let bound_addr = acceptor.local_addr().unwrap(); // cant get local_addr from acceptor
println!("Listener bound to {}", bound_addr);
server.serve(service).await;

I'm trying to figure out how to get the port that was bound when using "0.0.0.0:0". I don't have access to the listener.

The above code does not compile.

error[E0599]: no method named `local_addr` found for struct `TcpAcceptor` in the current scope
   --> src\main.rs:285:39
    |
285 |             let bound_addr = acceptor.local_addr().unwrap(); // Get the bound address
    |                                       ^^^^^^^^^^ method not found in `TcpAcceptor`

I'm not sure what to do to get the port bound; lmk if you do!

[chrislearn]

Are you using latest salvo?

[davehorner]

0.63.1; I can try updating but local_addr() doesn't exist on the acceptor and I don't know how to get the listener; wouldn't expect interface to change. * version did not provide a solution.

[chrislearn]

PLEASE updated to latest version and then ask questions, THANKS!!!

[davehorner]

ok so I can get the listener; its just no method named `local_addr` found for struct `salvo::prelude::TcpListener` in the current scope

            let listener = TcpListener::new(&addr);
            let acceptor = listener.bind().await;
            let server = Server::new(acceptor);
            
            let bound_addr = listener.local_addr().unwrap(); // Get the bound address

pub struct TcpListener<T> {
    local_addr: T,
}

its private. field `local_addr` of `TcpListener` is private

[chrislearn]

local_addr is a function of TcpAcceptor not TcpListener, https://docs.rs/salvo_core/latest/salvo_core/conn/tcp/struct.TcpAcceptor.html

[davehorner]

hmm. no method named `local_addr` found for struct `TcpAcceptor` in the current scope the code I started with tried to get it from the acceptor.

[davehorner]

Ok, did the upgraded

    Updating crates.io index
    Removing dirs v5.0.1
    Removing dirs-sys v0.4.1
    Removing foreign-types v0.3.2
    Removing foreign-types-shared v0.1.1
      Adding hyper-rustls v0.26.0
    Removing hyper-tls v0.6.0
    Removing libredox v0.0.1
      Adding multimap v0.10.0
    Removing native-tls v0.2.11
    Removing openssl v0.10.62
    Removing openssl-macros v0.1.1
    Removing openssl-sys v0.9.98
    Removing option-ext v0.2.0
    Removing redox_users v0.4.4
      Adding rustls-native-certs v0.7.0
    Updating salvo v0.63.1 -> v0.65.2
    Updating salvo-cors v0.63.1 -> v0.65.2
    Updating salvo-jwt-auth v0.63.1 -> v0.65.2
    Updating salvo-oapi v0.63.1 -> v0.65.2
    Updating salvo-oapi-macros v0.63.1 -> v0.65.2
      Adding salvo-serde-util v0.65.2
    Updating salvo-serve-static v0.63.1 -> v0.65.2
      Adding salvo_core v0.65.2
      Adding salvo_extra v0.65.2
      Adding salvo_macros v0.65.2
    Removing shellexpand v3.1.0
    Removing tokio-native-tls v0.3.1

its there now

            let listener = TcpListener::new(&addr);
            let acceptor = listener.bind().await;
            let server = Server::new(acceptor);
            let bound_addr = acceptor.local_addr();

borrow of moved value: `acceptor`
value borrowed here after moverustc[Click for full compiler diagnostic](rust-analyzer-diagnostics-view:/diagnostic%20message%20%5B13%5D?13#file%3A%2F%2F%2Fc%253A%2Fw%2Fmpvsvr%2Fsrc%2Fmain.rs)
main.rs(284, 38): value moved here
main.rs(283, 17): move occurs because `acceptor` has type `TcpAcceptor`, which does not implement the `Copy` trait

not sure what to do

[chrislearn]

let listener = TcpListener::new(&addr);
 let acceptor = listener.bind().await;
 let bound_addr = acceptor.local_addr();
 let server = Server::new(acceptor);

You should not ask so basic question here!

[davehorner]

I don't know why the answer came with a slap. but thank you very much. i did look on the website for a discord before asking.