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use std::{
future::Future,
pin::Pin,
task::{Context, Poll},
};
use futures::FutureExt;
use tracing::{debug, debug_span, info, span, warn, Instrument, Level};
use tracing_subscriber::{layer::SubscriberExt, registry::Registry};
use tracing_tree::HierarchicalLayer;
fn main() {
let layer = HierarchicalLayer::default()
.with_writer(std::io::stdout)
.with_indent_lines(true)
.with_indent_amount(4)
.with_thread_names(true)
.with_thread_ids(true)
.with_verbose_exit(true)
.with_verbose_entry(true)
.with_span_retrace(true)
.with_deferred_spans(true)
.with_targets(true);
let subscriber = Registry::default().with(layer);
tracing::subscriber::set_global_default(subscriber).unwrap();
#[cfg(feature = "tracing-log")]
tracing_log::LogTracer::init().unwrap();
let app_span = span!(Level::TRACE, "hierarchical-example", version = %0.1);
let _e = app_span.enter();
let server_span = span!(Level::TRACE, "server", host = "localhost", port = 8080);
let _e2 = server_span.enter();
info!("starting");
std::thread::sleep(std::time::Duration::from_millis(1000));
info!("listening");
let peer1 = span!(Level::TRACE, "conn", peer_addr = "82.9.9.9", port = 42381);
span!(Level::INFO, "empty-span").in_scope(|| {
// empty span
});
debug!("starting countdowns");
debug_span!("countdowns").in_scope(|| {
let mut countdown_a = CountdownFuture {
label: "a",
count: 3,
}
.instrument(span!(Level::DEBUG, "countdown_a"))
.fuse();
let mut countdown_b = CountdownFuture {
label: "b",
count: 5,
}
.instrument(span!(Level::DEBUG, "countdown_b"))
.fuse();
// We don't care if the futures are ready, as we poll manually
let waker = futures::task::noop_waker();
let mut cx = Context::from_waker(&waker);
let _ = countdown_a.poll_unpin(&mut cx);
let _ = countdown_b.poll_unpin(&mut cx);
std::thread::sleep(std::time::Duration::from_millis(300));
let _ = countdown_b.poll_unpin(&mut cx);
let _ = countdown_a.poll_unpin(&mut cx);
peer1.in_scope(|| {
warn!("peer1 warning");
});
tracing::info!("finished polling countdowns");
});
drop(peer1);
tracing::info!("all done!");
info!("exit")
}
struct CountdownFuture {
label: &'static str,
count: u32,
}
impl Future for CountdownFuture {
type Output = ();
fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
debug!(label=?self.label, count=?self.count, "polling countdown");
self.count -= 1;
if self.count == 0 {
Poll::Ready(())
} else {
cx.waker().wake_by_ref();
Poll::Pending
}
}
}
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