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use std::sync::LazyLock;
use bevy_log::tracing_subscriber::{
self, EnvFilter, Layer, Registry,
filter::Filtered,
fmt,
layer::{Context, SubscriberExt},
reload::{self, Handle},
util::SubscriberInitExt,
};
use parking_lot::{Mutex, MutexGuard};
use tracing::{Event, Level, Subscriber};
static LOCK: LazyLock<Mutex<()>> = LazyLock::new(|| Mutex::new(()));
pub fn init<'a>() -> MutexGuard<'a, ()> {
init_with_level(Level::WARN)
}
// can't treat these as one layer due to https://github.com/tokio-rs/tracing/issues/1629
struct LayerReloadHandles {
filter: Handle<Filtered<fmt::Layer<Registry>, EnvFilter, Registry>, Registry>,
test: Handle<TestTracingLayer, Registry>,
}
static RELOAD_HANDLES: LazyLock<LayerReloadHandles> = LazyLock::new(|| {
let (filter_layer, filter_reload_handle) = reload::Layer::new(
fmt::layer().with_filter(
EnvFilter::builder()
.with_default_directive(Level::WARN.into())
.from_env_lossy(),
),
);
let (test_layer, test_reload_handle) = reload::Layer::new(TestTracingLayer {
panic_on_level: Level::WARN,
});
tracing_subscriber::registry()
.with(filter_layer.and_then(test_layer))
.init();
LayerReloadHandles {
filter: filter_reload_handle,
test: test_reload_handle,
}
});
pub fn init_with_level<'a>(max_level: Level) -> MutexGuard<'a, ()> {
let lock = LOCK.lock();
RELOAD_HANDLES
.filter
.modify(|layer| {
*layer.filter_mut() = EnvFilter::builder()
.with_default_directive(max_level.into())
.from_env_lossy()
})
.unwrap();
RELOAD_HANDLES
.test
.modify(|layer| layer.panic_on_level = max_level)
.unwrap();
lock
}
struct TestTracingLayer {
panic_on_level: Level,
}
impl<S: Subscriber> Layer<S> for TestTracingLayer {
fn on_event(&self, event: &Event<'_>, _ctx: Context<'_, S>) {
let level = *event.metadata().level();
if level <= self.panic_on_level {
panic!("Logged on level {level}.");
}
}
}
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