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// Tests that depend on a count of the number of times their filter is evaluated
// cant exist in the same file with other tests that add subscribers to the
// registry. The registry was changed so that each time a new dispatcher is
// added all filters are re-evaluated. The tests being run only in separate
// threads with shared global state lets them interfere with each other
#[cfg(not(feature = "std"))]
extern crate std;
use tracing::{span, Level};
use tracing_mock::*;
use std::sync::{
atomic::{AtomicUsize, Ordering},
Arc,
};
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test::wasm_bindgen_test)]
#[test]
fn filters_are_not_reevaluated_for_the_same_span() {
// Asserts that the `span!` macro caches the result of calling
// `Subscriber::enabled` for each span.
let alice_count = Arc::new(AtomicUsize::new(0));
let bob_count = Arc::new(AtomicUsize::new(0));
let alice_count2 = alice_count.clone();
let bob_count2 = bob_count.clone();
let (subscriber, handle) = subscriber::mock()
.with_filter(move |meta| match meta.name() {
"alice" => {
alice_count2.fetch_add(1, Ordering::Relaxed);
false
}
"bob" => {
bob_count2.fetch_add(1, Ordering::Relaxed);
true
}
_ => false,
})
.run_with_handle();
// Since this test is in its own file anyway, we can do this. Thus, this
// test will work even with no-std.
tracing::subscriber::set_global_default(subscriber).unwrap();
// Enter "alice" and then "bob". The dispatcher expects to see "bob" but
// not "alice."
let alice = span!(Level::TRACE, "alice");
let bob = alice.in_scope(|| {
let bob = span!(Level::TRACE, "bob");
bob.in_scope(|| ());
bob
});
// The filter should have seen each span a single time.
assert_eq!(alice_count.load(Ordering::Relaxed), 1);
assert_eq!(bob_count.load(Ordering::Relaxed), 1);
alice.in_scope(|| bob.in_scope(|| {}));
// The subscriber should see "bob" again, but the filter should not have
// been called.
assert_eq!(alice_count.load(Ordering::Relaxed), 1);
assert_eq!(bob_count.load(Ordering::Relaxed), 1);
bob.in_scope(|| {});
assert_eq!(alice_count.load(Ordering::Relaxed), 1);
assert_eq!(bob_count.load(Ordering::Relaxed), 1);
handle.assert_finished();
}
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