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# Objective - Fixes https://github.com/bevyengine/bevy/issues/12597 The current tracing customization option (the `update_subscriber` field) was basically unusable because it provides a `dyn Subscriber` and most layers require a `Subscriber` that also implements `for<'a> LookupSpan<'a, Data=Data<'a>>`, so it was impossible to add a layer on top of the `dyn Subscriber`. This PR provides an alternative way of adding additional tracing layers to the LogPlugin by instead creating an `Option<Layer>`. This is enough for most situations because `Option<Layer>` and `Vec<Layer>` both implement `Layer`. ## Solution - Replace the `update_subscriber` field of `LogPlugin` with a `custom_layer` field which is function pointer returning an `Option<BoxedLayer>` - Update the examples to showcase that this works: - with multiple additional layers - with Layers that were previously problematic, such as `bevy::log::tracing_subscriber::fmt::layer().with_file(true)` (mentioned in the issue) Note that in the example this results in duplicate logs, since we have our own layer on top of the default `fmt_layer` added in the LogPlugin; maybe in the future we might want to provide a single one? Or to let the user customize the default `fmt_layer` ? I still think this change is an improvement upon the previous solution, which was basically broken. --- ## Changelog > This section is optional. If this was a trivial fix, or has no externally-visible impact, you can delete this section. - The `LogPlugin`'s `update_subscriber` field has been replaced with `custom_layer` to allow the user to flexibly add a `tracing::Layer` to the layer stack ## Migration Guide - The `LogPlugin`'s `update_subscriber` field has been replaced with `custom_layer` --------- Co-authored-by: BD103 <59022059+BD103@users.noreply.github.com> |
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