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|
cfg_trace! {
cfg_rt! {
use std::future::Future;
use std::pin::Pin;
use std::task::{Context, Poll};
use pin_project_lite::pin_project;
use tracing::Span;
pin_project! {
/// A future that has been instrumented with a `tracing` span.
#[derive(Debug, Clone)]
pub(crate) struct Instrumented<T> {
#[pin]
inner: T,
span: Span,
}
}
impl<T: Future> Future for Instrumented<T> {
type Output = T::Output;
fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
let this = self.project();
let _enter = this.span.enter();
this.inner.poll(cx)
}
}
impl<T> Instrumented<T> {
pub(crate) fn new(inner: T, span: Span) -> Self {
Self { inner, span }
}
}
#[inline]
pub(crate) fn task<F>(task: F, kind: &'static str) -> Instrumented<F> {
let span = tracing::trace_span!(
target: "tokio::task",
"task",
%kind,
future = %std::any::type_name::<F>(),
);
Instrumented::new(task, span)
}
}
}
cfg_not_trace! {
cfg_rt! {
#[inline]
pub(crate) fn task<F>(task: F, _: &'static str) -> F {
// nop
task
}
}
}
|
