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use super::{Latency, DEFAULT_ERROR_LEVEL};
use crate::LatencyUnit;
use std::{fmt, time::Duration};
use tracing::{Level, Span};
/// Trait used to tell [`Trace`] what to do when a request fails.
///
/// See the [module docs](../trace/index.html#on_failure) for details on exactly when the
/// `on_failure` callback is called.
///
/// [`Trace`]: super::Trace
pub trait OnFailure<FailureClass> {
/// Do the thing.
///
/// `latency` is the duration since the request was received.
///
/// `span` is the `tracing` [`Span`], corresponding to this request, produced by the closure
/// passed to [`TraceLayer::make_span_with`]. It can be used to [record field values][record]
/// that weren't known when the span was created.
///
/// [`Span`]: https://docs.rs/tracing/latest/tracing/span/index.html
/// [record]: https://docs.rs/tracing/latest/tracing/span/struct.Span.html#method.record
/// [`TraceLayer::make_span_with`]: crate::trace::TraceLayer::make_span_with
fn on_failure(&mut self, failure_classification: FailureClass, latency: Duration, span: &Span);
}
impl<FailureClass> OnFailure<FailureClass> for () {
#[inline]
fn on_failure(&mut self, _: FailureClass, _: Duration, _: &Span) {}
}
impl<F, FailureClass> OnFailure<FailureClass> for F
where
F: FnMut(FailureClass, Duration, &Span),
{
fn on_failure(&mut self, failure_classification: FailureClass, latency: Duration, span: &Span) {
self(failure_classification, latency, span)
}
}
/// The default [`OnFailure`] implementation used by [`Trace`].
///
/// [`Trace`]: super::Trace
#[derive(Clone, Debug)]
pub struct DefaultOnFailure {
level: Level,
latency_unit: LatencyUnit,
}
impl Default for DefaultOnFailure {
fn default() -> Self {
Self {
level: DEFAULT_ERROR_LEVEL,
latency_unit: LatencyUnit::Millis,
}
}
}
impl DefaultOnFailure {
/// Create a new `DefaultOnFailure`.
pub fn new() -> Self {
Self::default()
}
/// Set the [`Level`] used for [tracing events].
///
/// Defaults to [`Level::ERROR`].
///
/// [tracing events]: https://docs.rs/tracing/latest/tracing/#events
pub fn level(mut self, level: Level) -> Self {
self.level = level;
self
}
/// Set the [`LatencyUnit`] latencies will be reported in.
///
/// Defaults to [`LatencyUnit::Millis`].
pub fn latency_unit(mut self, latency_unit: LatencyUnit) -> Self {
self.latency_unit = latency_unit;
self
}
}
impl<FailureClass> OnFailure<FailureClass> for DefaultOnFailure
where
FailureClass: fmt::Display,
{
fn on_failure(&mut self, failure_classification: FailureClass, latency: Duration, _: &Span) {
let latency = Latency {
unit: self.latency_unit,
duration: latency,
};
event_dynamic_lvl!(
self.level,
classification = %failure_classification,
%latency,
"response failed"
);
}
}