Forward Filtered::downcast_raw to wrapped Layer
#1619
Merged
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
If `Filtered::downcast_raw` can't resolve the type given to it, forward the type to the wrapped `Layer`'s `downcast_raw`, in case that `Layer` has overridden that method.
hawkw
approved these changes
Oct 5, 2021
| use tracing_subscriber::filter::Targets; | ||
| use tracing_subscriber::prelude::*; | ||
| use tracing_subscriber::Layer; | ||
|
|
There was a problem hiding this comment.
it may also be nice to add a test for downcasting to the Layer type itself, ensuring that normal downcasting works? this PR doesn't affect that, so we certainly don't need to also add it, but it might be nice to have if we're going to have a module of downcast_raw tests. could also be added in a follow-up change!
There was a problem hiding this comment.
OK, I added downcast_ref_to_inner_layer_and_filter for this. Let me know if it needs anything more.
hawkw
approved these changes
Oct 5, 2021
Not to push my luck too far (so tell me to buzz off if you want), but any idea when this would make it into a crates.io release? |
I want to publish a new |
davidbarsky
approved these changes
Oct 5, 2021
hawkw
added a commit
that referenced
this pull request
Oct 5, 2021
# 0.2.25 (October 5, 2021) This release fixes an issue where a `Layer` implementation's custom `downcast_raw` implementation was lost when wrapping that layer with a per-layer filter. ### Fixed - **registry**: Forward `Filtered::downcast_raw` to wrapped `Layer` ([#1619]) ### Added - Documentation improvements ([#1596], [#1601]) Thanks to @bryanburgers for contributing to this release! [#1619]: #1619 [#1601]: #1601 [#1596]: #1596
hawkw
added a commit
that referenced
this pull request
Oct 5, 2021
# 0.2.25 (October 5, 2021) This release fixes an issue where a `Layer` implementation's custom `downcast_raw` implementation was lost when wrapping that layer with a per-layer filter. ### Fixed - **registry**: Forward `Filtered::downcast_raw` to wrapped `Layer` ([#1619]) ### Added - Documentation improvements ([#1596], [#1601]) Thanks to @bryanburgers for contributing to this release! [#1619]: #1619 [#1601]: #1601 [#1596]: #1596
davidbarsky
added a commit
that referenced
this pull request
Nov 29, 2021
## Motivation I'm trying to implement a `Layer` that has something very similar to tracing-error's [`WithContext`](https://github.com/tokio-rs/tracing/blob/66cd79f72af5ebcb6f21a1017b6ce33bea05558d/tracing-error/src/layer.rs#L32) to support erasing types and getting access to the current span's state. To do that, I implement `Layer::downcast_raw` in [the same way that tracing-error does](https://github.com/tokio-rs/tracing/blob/66cd79f72af5ebcb6f21a1017b6ce33bea05558d/tracing-error/src/layer.rs#L55-L63). This works great when the layer is not filtered. However, once I filter the layer ```rust let filter = tracing_subscriber::filter::Targets::new().with_default(tracing::Level::INFO); let layer = MyLayer::new(); tracing_subscriber::registry().with(layer.with_filter(filter)).init(); ``` I'm not able to get a `WithContext` instance anymore, because `Filtered` [handles `downcast_raw`, and doesn't forward it](https://github.com/tokio-rs/tracing/blob/66cd79f72af5ebcb6f21a1017b6ce33bea05558d/tracing-subscriber/src/filter/layer_filters.rs#L379-L391) to `MyLayer::downcast_raw`. ## Solution If `Filtered::downcast_raw` does not know how to handle the given type, forward it to the wrapped layer's `Layer::downcast_raw` implementation. Fixes #1618
kaffarell
pushed a commit
to kaffarell/tracing
that referenced
this pull request
May 22, 2024
…rs#1619) ## Motivation I'm trying to implement a `Layer` that has something very similar to tracing-error's [`WithContext`](https://github.com/tokio-rs/tracing/blob/66cd79f72af5ebcb6f21a1017b6ce33bea05558d/tracing-error/src/layer.rs#L32) to support erasing types and getting access to the current span's state. To do that, I implement `Layer::downcast_raw` in [the same way that tracing-error does](https://github.com/tokio-rs/tracing/blob/66cd79f72af5ebcb6f21a1017b6ce33bea05558d/tracing-error/src/layer.rs#L55-L63). This works great when the layer is not filtered. However, once I filter the layer ```rust let filter = tracing_subscriber::filter::Targets::new().with_default(tracing::Level::INFO); let layer = MyLayer::new(); tracing_subscriber::registry().with(layer.with_filter(filter)).init(); ``` I'm not able to get a `WithContext` instance anymore, because `Filtered` [handles `downcast_raw`, and doesn't forward it](https://github.com/tokio-rs/tracing/blob/66cd79f72af5ebcb6f21a1017b6ce33bea05558d/tracing-subscriber/src/filter/layer_filters.rs#L379-L391) to `MyLayer::downcast_raw`. ## Solution If `Filtered::downcast_raw` does not know how to handle the given type, forward it to the wrapped layer's `Layer::downcast_raw` implementation. Fixes tokio-rs#1618
kaffarell
pushed a commit
to kaffarell/tracing
that referenced
this pull request
May 22, 2024
# 0.2.25 (October 5, 2021) This release fixes an issue where a `Layer` implementation's custom `downcast_raw` implementation was lost when wrapping that layer with a per-layer filter. ### Fixed - **registry**: Forward `Filtered::downcast_raw` to wrapped `Layer` ([tokio-rs#1619]) ### Added - Documentation improvements ([tokio-rs#1596], [tokio-rs#1601]) Thanks to @bryanburgers for contributing to this release! [tokio-rs#1619]: tokio-rs#1619 [tokio-rs#1601]: tokio-rs#1601 [tokio-rs#1596]: tokio-rs#1596
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Motivation
I'm trying to implement a
Layerthat has something very similar to tracing-error'sWithContextto support erasing types and getting access to the current span's state.To do that, I implement
Layer::downcast_rawin the same way that tracing-error does.This works great when the layer is not filtered. However, once I filter the layer
I'm not able to get a
WithContextinstance anymore, becauseFilteredhandlesdowncast_raw, and doesn't forward it toMyLayer::downcast_raw.Solution
If
Filtered::downcast_rawdoes not know how to handle the given type, forward it to the wrapped layer'sLayer::downcast_rawimplementation.Fixes #1618