Basic tracing example

tracing.rs

use anyhow::Result;
use axum::routing::get;
use axum::Router;
use std::net::SocketAddr;
use tracing::{info, Level};
use tracing_subscriber::FmtSubscriber;

#[tokio::main]
async fn main() -> Result<()> {
    // logging init
    let subscriber = FmtSubscriber::builder()
        .with_max_level(Level::INFO)
        .finish();

    tracing::subscriber::set_global_default(subscriber)?;

    // build our application with a route
    let app = Router::new().route("/", get(root));

    let addr = SocketAddr::from(([127, 0, 0, 1], 3000));
    axum::Server::bind(&addr)
        .serve(app.into_make_service())
        .await?;

    Ok(())
}

async fn root() -> &'static str {
    info!("root was called");
    "Hello"
}