14c20a6c9c
# Objective In my library, [`bevy_dev_console`](https://github.com/doonv/bevy_dev_console) I need access to `App` within `LogPlugin::update_subscriber` in order to communicate with the `App` from my custom `Layer`. ## Solution Give access to `App`. --- ## Changelog - Added access to `App` within `LogPlugin::update_subscriber` ## Migration Guide `LogPlugin::update_subscriber` now has a `&mut App` parameter. If you don't need access to `App`, you can ignore the parameter with an underscore (`_`). ```diff,rust - fn update_subscriber(subscriber: BoxedSubscriber) -> BoxedSubscriber { + fn update_subscriber(_: &mut App, subscriber: BoxedSubscriber) -> BoxedSubscriber { Box::new(subscriber.with(CustomLayer)) } ```
58 lines
1.9 KiB
Rust
58 lines
1.9 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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// We don't need App for this example, as we are just printing log information.
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// For an example that uses App, see log_layers_ecs.
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fn update_subscriber(_: &mut App, 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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// You can chain multiple subscriber updates like this:
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//
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// update_subscriber: Some(|app, subscriber| {
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// let subscriber = update_subscriber_a(app, subscriber);
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// let subscriber = update_subscriber_b(app, subscriber);
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//
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// update_subscriber_c(app, subscriber)
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// }),
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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 important" 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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