How to run a callback function on actix-web server start? - rust

Question

Currently my main function, where the server starts looks like this
#[actix_rt::main]
async fn main() -> std::io::Result<()> {
let address = "0.0.0.0:3000";
HttpServer::new(move || {
let app_state = {...some state};
App::new()
.data(app_state)
.wrap(middleware::Logger::default())
.service(network_api::init_service())
})
.bind(address)?
.run()
.await
}
Once the server starts, I want to run one (async) function,
to make a request to another server, and that server should respond with another request to this server
that just got up and running.
Not sure I see in the documentation anything mentioning a callback function that is run only once on server start.
For example maybe having it in run() function, like this:
run(|| {
// server started now perform some request or whatever
Client::new().post(&url).json(json_stuff).send().await
})
Edit
I think I solved it, will post answer when I can answer my own question

Answer 1

I have solved this by joining 2 async functions,
created another async function
async fn another_func() -> Result<()> {
...
}
and have used future::join() like this
let server = HttpServer::new(move || {
let app_state = {...some state};
App::new()
.data(app_state)
.wrap(middleware::Logger::default())
.service(network_api::init_service())
})
.bind(address)?
.run();
future::join(server, another_func()).await;
Ok(()
Of course if anyone has a better answer please post it

Answer 2

I actually struggled with it a bit and eventually replaced the future::join with tokio join! macro as follows:
tokio::join!(server, utils::open_web_app(server_address));
Ok(())