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#![cfg(feature = "registry")]
use std::sync::atomic::{AtomicUsize, Ordering};
use tracing_core::{
span::{Attributes, Id, Record},
subscriber::Interest,
Event, LevelFilter, Metadata, Subscriber,
};
use tracing_subscriber::{layer, prelude::*, reload::*};
pub struct NopSubscriber;
fn event() {
tracing::info!("my event");
}
impl Subscriber for NopSubscriber {
fn register_callsite(&self, _: &'static Metadata<'static>) -> Interest {
Interest::never()
}
fn enabled(&self, _: &Metadata<'_>) -> bool {
false
}
fn new_span(&self, _: &Attributes<'_>) -> Id {
Id::from_u64(1)
}
fn record(&self, _: &Id, _: &Record<'_>) {}
fn record_follows_from(&self, _: &Id, _: &Id) {}
fn event(&self, _: &Event<'_>) {}
fn enter(&self, _: &Id) {}
fn exit(&self, _: &Id) {}
}
/// Running these two tests in parallel will cause flaky failures, since they are both modifying the MAX_LEVEL value.
/// "cargo test -- --test-threads=1 fixes it, but it runs all tests in serial.
/// The only way to run tests in serial in a single file is this way.
#[test]
fn run_all_reload_test() {
reload_handle();
reload_filter();
}
fn reload_handle() {
static FILTER1_CALLS: AtomicUsize = AtomicUsize::new(0);
static FILTER2_CALLS: AtomicUsize = AtomicUsize::new(0);
enum Filter {
One,
Two,
}
impl<S: Subscriber> tracing_subscriber::Layer<S> for Filter {
fn register_callsite(&self, m: &Metadata<'_>) -> Interest {
println!("REGISTER: {:?}", m);
Interest::sometimes()
}
fn enabled(&self, m: &Metadata<'_>, _: layer::Context<'_, S>) -> bool {
println!("ENABLED: {:?}", m);
match self {
Filter::One => FILTER1_CALLS.fetch_add(1, Ordering::SeqCst),
Filter::Two => FILTER2_CALLS.fetch_add(1, Ordering::SeqCst),
};
true
}
fn max_level_hint(&self) -> Option<LevelFilter> {
match self {
Filter::One => Some(LevelFilter::INFO),
Filter::Two => Some(LevelFilter::DEBUG),
}
}
}
let (layer, handle) = Layer::new(Filter::One);
let subscriber = tracing_core::dispatcher::Dispatch::new(layer.with_subscriber(NopSubscriber));
tracing_core::dispatcher::with_default(&subscriber, || {
assert_eq!(FILTER1_CALLS.load(Ordering::SeqCst), 0);
assert_eq!(FILTER2_CALLS.load(Ordering::SeqCst), 0);
event();
assert_eq!(FILTER1_CALLS.load(Ordering::SeqCst), 1);
assert_eq!(FILTER2_CALLS.load(Ordering::SeqCst), 0);
assert_eq!(LevelFilter::current(), LevelFilter::INFO);
handle.reload(Filter::Two).expect("should reload");
assert_eq!(LevelFilter::current(), LevelFilter::DEBUG);
event();
assert_eq!(FILTER1_CALLS.load(Ordering::SeqCst), 1);
assert_eq!(FILTER2_CALLS.load(Ordering::SeqCst), 1);
})
}
fn reload_filter() {
struct NopLayer;
impl<S: Subscriber> tracing_subscriber::Layer<S> for NopLayer {
fn register_callsite(&self, _m: &Metadata<'_>) -> Interest {
Interest::sometimes()
}
fn enabled(&self, _m: &Metadata<'_>, _: layer::Context<'_, S>) -> bool {
true
}
}
static FILTER1_CALLS: AtomicUsize = AtomicUsize::new(0);
static FILTER2_CALLS: AtomicUsize = AtomicUsize::new(0);
enum Filter {
One,
Two,
}
impl<S: Subscriber> tracing_subscriber::layer::Filter<S> for Filter {
fn enabled(&self, m: &Metadata<'_>, _: &layer::Context<'_, S>) -> bool {
println!("ENABLED: {:?}", m);
match self {
Filter::One => FILTER1_CALLS.fetch_add(1, Ordering::SeqCst),
Filter::Two => FILTER2_CALLS.fetch_add(1, Ordering::SeqCst),
};
true
}
fn max_level_hint(&self) -> Option<LevelFilter> {
match self {
Filter::One => Some(LevelFilter::INFO),
Filter::Two => Some(LevelFilter::DEBUG),
}
}
}
let (filter, handle) = Layer::new(Filter::One);
let dispatcher = tracing_core::Dispatch::new(
tracing_subscriber::registry().with(NopLayer.with_filter(filter)),
);
tracing_core::dispatcher::with_default(&dispatcher, || {
assert_eq!(FILTER1_CALLS.load(Ordering::SeqCst), 0);
assert_eq!(FILTER2_CALLS.load(Ordering::SeqCst), 0);
event();
assert_eq!(FILTER1_CALLS.load(Ordering::SeqCst), 1);
assert_eq!(FILTER2_CALLS.load(Ordering::SeqCst), 0);
assert_eq!(LevelFilter::current(), LevelFilter::INFO);
handle.reload(Filter::Two).expect("should reload");
assert_eq!(LevelFilter::current(), LevelFilter::DEBUG);
event();
assert_eq!(FILTER1_CALLS.load(Ordering::SeqCst), 1);
assert_eq!(FILTER2_CALLS.load(Ordering::SeqCst), 1);
})
}
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