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#![cfg(feature = "registry")]
use std::sync::{Arc, Mutex};
use tracing::{subscriber::with_default, Event, Metadata, Subscriber};
use tracing_subscriber::{layer::Context, prelude::*, registry, Layer};
struct TrackingLayer {
enabled: bool,
event_enabled_count: Arc<Mutex<usize>>,
event_enabled: bool,
on_event_count: Arc<Mutex<usize>>,
}
impl<C> Layer<C> for TrackingLayer
where
C: Subscriber + Send + Sync + 'static,
{
fn enabled(&self, _metadata: &Metadata<'_>, _ctx: Context<'_, C>) -> bool {
self.enabled
}
fn event_enabled(&self, _event: &Event<'_>, _ctx: Context<'_, C>) -> bool {
*self.event_enabled_count.lock().unwrap() += 1;
self.event_enabled
}
fn on_event(&self, _event: &Event<'_>, _ctx: Context<'_, C>) {
*self.on_event_count.lock().unwrap() += 1;
}
}
#[test]
fn event_enabled_is_only_called_once() {
let event_enabled_count = Arc::new(Mutex::default());
let count = event_enabled_count.clone();
let subscriber = registry().with(TrackingLayer {
enabled: true,
event_enabled_count,
event_enabled: true,
on_event_count: Arc::new(Mutex::default()),
});
with_default(subscriber, || {
tracing::error!("hiya!");
});
assert_eq!(1, *count.lock().unwrap());
}
#[test]
fn event_enabled_not_called_when_not_enabled() {
let event_enabled_count = Arc::new(Mutex::default());
let count = event_enabled_count.clone();
let subscriber = registry().with(TrackingLayer {
enabled: false,
event_enabled_count,
event_enabled: true,
on_event_count: Arc::new(Mutex::default()),
});
with_default(subscriber, || {
tracing::error!("hiya!");
});
assert_eq!(0, *count.lock().unwrap());
}
#[test]
fn event_disabled_does_disable_event() {
let on_event_count = Arc::new(Mutex::default());
let count = on_event_count.clone();
let subscriber = registry().with(TrackingLayer {
enabled: true,
event_enabled_count: Arc::new(Mutex::default()),
event_enabled: false,
on_event_count,
});
with_default(subscriber, || {
tracing::error!("hiya!");
});
assert_eq!(0, *count.lock().unwrap());
}
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