8c6d9b8103
# Objective This PR is heavily inspired by https://github.com/bevyengine/bevy/pull/7682 It aims to solve the same problem: allowing the user to extend the tracing subscriber with extra layers. (in my case, I'd like to use `use metrics_tracing_context::{MetricsLayer, TracingContextLayer};`) ## Solution I'm proposing a different api where the user has the opportunity to take the existing `subscriber` and apply any transformations on it. --- ## Changelog - Added a `update_subscriber` option on the `LogPlugin` that lets the user modify the `subscriber` (for example to extend it with more tracing `Layers` ## Migration Guide > This section is optional. If there are no breaking changes, you can delete this section. - Added a new field `update_subscriber` in the `LogPlugin` --------- Co-authored-by: Charles Bournhonesque <cbournhonesque@snapchat.com>
48 lines
1.4 KiB
Rust
48 lines
1.4 KiB
Rust
//! This example illustrates how to add custom log layers in bevy.
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use bevy::{
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log::tracing_subscriber::{layer::SubscriberExt, Layer},
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log::BoxedSubscriber,
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prelude::*,
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utils::tracing::Subscriber,
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};
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struct CustomLayer;
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impl<S: Subscriber> Layer<S> for CustomLayer {
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fn on_event(
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&self,
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event: &bevy::utils::tracing::Event<'_>,
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_ctx: bevy::log::tracing_subscriber::layer::Context<'_, S>,
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) {
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println!("Got event!");
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println!(" level={:?}", event.metadata().level());
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println!(" target={:?}", event.metadata().target());
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println!(" name={:?}", event.metadata().name());
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}
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}
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fn update_subscriber(subscriber: BoxedSubscriber) -> BoxedSubscriber {
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Box::new(subscriber.with(CustomLayer))
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}
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fn main() {
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App::new()
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.add_plugins(DefaultPlugins.set(bevy::log::LogPlugin {
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update_subscriber: Some(update_subscriber),
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..default()
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}))
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.add_systems(Update, log_system)
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.run();
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}
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fn log_system() {
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// here is how you write new logs at each "log level" (in "most import" to
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// "least important" order)
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error!("something failed");
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warn!("something bad happened that isn't a failure, but thats worth calling out");
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info!("helpful information that is worth printing by default");
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debug!("helpful for debugging");
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trace!("very noisy");
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}
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