Add new filter methods #1973

tfreiberg-fastly · 2022-03-08T15:30:34Z

Related to #1955

Call those methods in the Layer methods for Filtered and delegate them in the filter combinators

Motivation

Currently, if a Filter is going to implement dynamic filtering, it must do this by querying the wrapped Subscriber for the current span context. Since Filter only has callsite_enabled and enabled methods, a Filter implementation cannot track the span context internally, the way a Layer can.

Unfortunately, this means that the current implementation of EnvFilter can only implement Layer (and provide global filtering). It cannot currently implement Filter, because it stores span context data internally. See #1868 for details.

Proposal

We should add on_new_span, on_enter, on_exit, and on_close methods to Filter. This would allow implementing Filters (such as EnvFilter) that internally track span states.

tracing-subscriber/src/filter/layer_filters/combinator.rs

tfreiberg-fastly · 2022-03-08T16:37:34Z

tracing-subscriber/src/filter/layer_filters/mod.rs

@@ -579,7 +579,9 @@ where

    fn on_new_span(&self, attrs: &span::Attributes<'_>, id: &span::Id, cx: Context<'_, S>) {
        self.did_enable(|| {
-            self.layer.on_new_span(attrs, id, cx.with_filter(self.id()));
+            let cx = cx.with_filter(self.id());
+            self.filter.on_new_span(attrs, id, cx.clone());


I mostly guessed here: should the filter.on_new_span method be called with cx.with_filter or just with cx? I don't really understand these details here.

Also, I guessed that it might be more correct to first update the filters and then the layer, not sure if that can make a difference or of the filter should be called last.
The question about the order of filter and layer calls applies to all four changes in this file

I mostly guessed here: should the filter.on_new_span method be called with cx.with_filter or just with cx? I don't really understand these details here.

This is a good question. The difference is that calling cx.with_filter(...) means that the context will filter out any spans from the current span context that were previously disabled by that filter. I think it makes sense for the filter to not see any spans that it previously filtered out. So, passing the with_filter context to the filter is probably the right thing.

Also, I guessed that it might be more correct to first update the filters and then the layer, not sure if that can make a difference or of the filter should be called last. The question about the order of filter and layer calls applies to all four changes in this file

I don't think it actually makes a difference which order the methods are called in. The filter can only enable/disable things in its enabled method, not in on_$WHATEVER, so calling the on_$WHATEVER method is only going to effect the next enabled call. It won't have an effect on what the inner layer sees in its on_$WHATEVER method. So, we can actually call them in whatever order and it shouldn't make a difference.

I think it makes sense for the filter to not see any spans that it previously filtered out.
that sounds to me like it might depend on what Interest that filter would return for that span? Very low confidence though 😅

Good to know about the order though. Thanks for the explanations!

tracing-subscriber/src/layer/mod.rs

hawkw

Thanks for working on this --- this looks great to me overall! I commented on some minor style nits, but the implementation seems correct.

It would be nice to add a bit more documentation on the new methods; perhaps we should put something explaining the general use of these methods in the top-level documentation for the Filter trait? But, that's not a blocker for merging this PR, I would be fine with going back and expanding on it later.

Once this is merged, I'll be happy to add a Filter implementation for EnvFilter using this code!

tracing-subscriber/src/filter/layer_filters/combinator.rs

tracing-subscriber/src/layer/mod.rs

tracing-subscriber/src/filter/layer_filters/combinator.rs

Co-authored-by: Eliza Weisman <eliza@buoyant.io>

hawkw

okay, looks great to me --- thanks!

tracing-subscriber/src/filter/layer_filters/combinator.rs

Closes #1955 Call those methods in the `Subscribe` methods for `Filtered` and delegate them in the filter combinators ## Motivation Currently, if a `Filter` is going to implement dynamic filtering, it must do this by querying the wrapped Subscriber for the current span context. Since `Filter` only has callsite_enabled and enabled methods, a `Filter` implementation cannot track the span context internally, the way a subscriber can. Unfortunately, this means that the current implementation of `EnvFilter` can only implement `Subscribe` (and provide global filtering). It cannot currently implement `Filter`, because it stores span context data internally. See #1868 for details. ## Proposal We should add `on_new_span`, `on_enter`, `on_exit`, and `on_close` methods to `Filter`. This would allow implementing `Filter`s (such as `EnvFilter`) that internally track span states.

## Motivation Filtering by span and field requires using `EnvFilter` rather than `Targets`. Per-layer filtering requires the `Filter` trait, which `EnvFilter` does not implement. ## Solution Implement the `Filter` trait for `EnvFilter`. PR #1973 adds additiional methods to the `Filter` trait, which are necessary for `EnvFilter` to implement dynamic span filtering. Now that those methods are added, we can provide a `Filter` impl for `EnvFilter`. In addition, we changed the globally-scoped `thread_local!` macro to use a `ThreadLocal` struct as a field, so that multiple `EnvFilter`s used as per-layer filters don't share a single span scope. Fixes #1868 Follow-up on #1973 Co-authored-by: Eliza Weisman <eliza@buoyant.io>

## Motivation Filtering by span and field requires using `EnvFilter` rather than `Targets`. Per-subscriber filtering requires the `Filter` trait, which `EnvFilter` does not implement. ## Solution Implement the `Filter` trait for `EnvFilter`. PR #1973 adds additiional methods to the `Filter` trait, which are necessary for `EnvFilter` to implement dynamic span filtering. Now that those methods are added, we can provide a `Filter` impl for `EnvFilter`. In addition, we changed the globally-scoped `thread_local!` macro to use a `ThreadLocal` struct as a field, so that multiple `EnvFilter`s used as per-subscriber filters don't share a single span scope. Fixes #1868 Follow-up on #1973 Co-authored-by: Eliza Weisman <eliza@buoyant.io>

@TimoFreiberg

# 0.3.10 (Apr 1, 2022) This release adds several new features, including a `Filter` implementation and new builder API for `EnvFilter`, support for using a `Vec<L> where L: Layer` as a `Layer`, and a number of smaller API improvements to make working with dynamic and reloadable layers easier. ### Added - **registry**: Implement `Filter` for `EnvFilter`, allowing it to be used with per-layer filtering ([#1983]) - **registry**: `Filter::on_new_span`, `Filter::on_enter`, `Filter::on_exit`, `Filter::on_close` and `Filter::on_record` callbacks to allow `Filter`s to track span states internally ([#1973], [#2017], [#2031]) - **registry**: `Filtered::filter` and `Filtered::filter_mut` accessors ([#1959]) - **registry**: `Filtered::inner` and `Filtered::inner_mut` accessors to borrow the wrapped `Layer` ([#2034]) - **layer**: Implement `Layer` for `Vec<L: Layer>`, to allow composing together a dynamically sized list of `Layer`s ([#2027]) - **layer**: `Layer::boxed` method to make type-erasing `Layer`s easier ([#2026]) - **fmt**: `fmt::Layer::writer` and `fmt::Layer::writer_mut` accessors ([#2034]) - **fmt**: `fmt::Layer::set_ansi` method to allow changing the ANSI formatting configuration at runtime ([#2034]) - **env-filter**: `EnvFilter::builder` to configure a new `EnvFilter` prior to parsing it ([#2035]) - Several documentation fixes and improvements ([#1972], [#1971], [#2023], [#2023]) ### Fixed - **fmt**: `fmt::Layer`'s auto traits no longer depend on the `Subscriber` type parameter's auto traits ([2025]) - **env-filter**: Fixed missing help text when the `ansi` feature is disabled ([#2029]) Thanks to new contributors @TimoFreiberg and @wagenet, as well as @CAD97 for contributing to this release! [#1983]: #1983 [#1973]: #1973 [#2017]: #2017 [#2031]: #2031 [#1959]: #1959 [#2034]: #2034 [#2027]: #2027 [#2026]: #2026 [#2035]: #2035 [#1972]: #1972 [#1971]: #1971 [#2023]: #2023

@TimoFreiberg

# 0.3.10 (Apr 1, 2022) This release adds several new features, including a `Filter` implementation and new builder API for `EnvFilter`, support for using a `Vec<L> where L: Layer` as a `Layer`, and a number of smaller API improvements to make working with dynamic and reloadable layers easier. ### Added - **registry**: Implement `Filter` for `EnvFilter`, allowing it to be used with per-layer filtering ([#1983]) - **registry**: `Filter::on_new_span`, `Filter::on_enter`, `Filter::on_exit`, `Filter::on_close` and `Filter::on_record` callbacks to allow `Filter`s to track span states internally ([#1973], [#2017], [#2031]) - **registry**: `Filtered::filter` and `Filtered::filter_mut` accessors ([#1959]) - **registry**: `Filtered::inner` and `Filtered::inner_mut` accessors to borrow the wrapped `Layer` ([#2034]) - **layer**: Implement `Layer` for `Vec<L: Layer>`, to allow composing together a dynamically sized list of `Layer`s ([#2027]) - **layer**: `Layer::boxed` method to make type-erasing `Layer`s easier ([#2026]) - **fmt**: `fmt::Layer::writer` and `fmt::Layer::writer_mut` accessors ([#2034]) - **fmt**: `fmt::Layer::set_ansi` method to allow changing the ANSI formatting configuration at runtime ([#2034]) - **env-filter**: `EnvFilter::builder` to configure a new `EnvFilter` prior to parsing it ([#2035]) - Several documentation fixes and improvements ([#1972], [#1971], [#2023], [#2023]) ### Fixed - **fmt**: `fmt::Layer`'s auto traits no longer depend on the `Subscriber` type parameter's auto traits ([2025]) - **env-filter**: Fixed missing help text when the `ansi` feature is disabled ([#2029]) Thanks to new contributors @TimoFreiberg and @wagenet, as well as @CAD97 for contributing to this release! [#1983]: #1983 [#1973]: #1973 [#2017]: #2017 [#2031]: #2031 [#1959]: #1959 [#2034]: #2034 [#2027]: #2027 [#2026]: #2026 [#2035]: #2035 [#1972]: #1972 [#1971]: #1971 [#2023]: #2023

@TimoFreiberg

# 0.3.10 (Apr 1, 2022) This release adds several new features, including a `Filter` implementation and new builder API for `EnvFilter`, support for using a `Vec<L> where L: Layer` as a `Layer`, and a number of smaller API improvements to make working with dynamic and reloadable layers easier. ### Added - **registry**: Implement `Filter` for `EnvFilter`, allowing it to be used with per-layer filtering ([#1983]) - **registry**: `Filter::on_new_span`, `Filter::on_enter`, `Filter::on_exit`, `Filter::on_close` and `Filter::on_record` callbacks to allow `Filter`s to track span states internally ([#1973], [#2017], [#2031]) - **registry**: `Filtered::filter` and `Filtered::filter_mut` accessors ([#1959]) - **registry**: `Filtered::inner` and `Filtered::inner_mut` accessors to borrow the wrapped `Layer` ([#2034]) - **layer**: Implement `Layer` for `Vec<L: Layer>`, to allow composing together a dynamically sized list of `Layer`s ([#2027]) - **layer**: `Layer::boxed` method to make type-erasing `Layer`s easier ([#2026]) - **fmt**: `fmt::Layer::writer` and `fmt::Layer::writer_mut` accessors ([#2034]) - **fmt**: `fmt::Layer::set_ansi` method to allow changing the ANSI formatting configuration at runtime ([#2034]) - **env-filter**: `EnvFilter::builder` to configure a new `EnvFilter` prior to parsing it ([#2035]) - Several documentation fixes and improvements ([#1972], [#1971], [#2023], [#2023]) ### Fixed - **fmt**: `fmt::Layer`'s auto traits no longer depend on the `Subscriber` type parameter's auto traits ([2025]) - **env-filter**: Fixed missing help text when the `ansi` feature is disabled ([#2029]) Thanks to new contributors @TimoFreiberg and @wagenet, as well as @CAD97 for contributing to this release! [#1983]: #1983 [#1973]: #1973 [#2017]: #2017 [#2031]: #2031 [#1959]: #1959 [#2034]: #2034 [#2027]: #2027 [#2026]: #2026 [#2035]: #2035 [#1972]: #1972 [#1971]: #1971 [#2023]: #2023

@TimoFreiberg

# 0.3.10 (Apr 1, 2022) This release adds several new features, including a `Filter` implementation and new builder API for `EnvFilter`, support for using a `Vec<L> where L: Layer` as a `Layer`, and a number of smaller API improvements to make working with dynamic and reloadable layers easier. ### Added - **registry**: Implement `Filter` for `EnvFilter`, allowing it to be used with per-layer filtering ([#1983]) - **registry**: `Filter::on_new_span`, `Filter::on_enter`, `Filter::on_exit`, `Filter::on_close` and `Filter::on_record` callbacks to allow `Filter`s to track span states internally ([#1973], [#2017], [#2031]) - **registry**: `Filtered::filter` and `Filtered::filter_mut` accessors ([#1959]) - **registry**: `Filtered::inner` and `Filtered::inner_mut` accessors to borrow the wrapped `Layer` ([#2034]) - **layer**: Implement `Layer` for `Vec<L: Layer>`, to allow composing together a dynamically sized list of `Layer`s ([#2027]) - **layer**: `Layer::boxed` method to make type-erasing `Layer`s easier ([#2026]) - **fmt**: `fmt::Layer::writer` and `fmt::Layer::writer_mut` accessors ([#2034]) - **fmt**: `fmt::Layer::set_ansi` method to allow changing the ANSI formatting configuration at runtime ([#2034]) - **env-filter**: `EnvFilter::builder` to configure a new `EnvFilter` prior to parsing it ([#2035]) - Several documentation fixes and improvements ([#1972], [#1971], [#2023], [#2023]) ### Fixed - **fmt**: `fmt::Layer`'s auto traits no longer depend on the `Subscriber` type parameter's auto traits ([2025]) - **env-filter**: Fixed missing help text when the `ansi` feature is disabled ([#2029]) Thanks to new contributors @TimoFreiberg and @wagenet, as well as @CAD97 for contributing to this release! [#1983]: #1983 [#1973]: #1973 [#2017]: #2017 [#2031]: #2031 [#1959]: #1959 [#2034]: #2034 [#2027]: #2027 [#2026]: #2026 [#2035]: #2035 [#1972]: #1972 [#1971]: #1971 [#2023]: #2023

@TimoFreiberg

# 0.3.10 (Apr 1, 2022) This release adds several new features, including a `Filter` implementation and new builder API for `EnvFilter`, support for using a `Vec<L> where L: Layer` as a `Layer`, and a number of smaller API improvements to make working with dynamic and reloadable layers easier. ### Added - **registry**: Implement `Filter` for `EnvFilter`, allowing it to be used with per-layer filtering ([#1983]) - **registry**: `Filter::on_new_span`, `Filter::on_enter`, `Filter::on_exit`, `Filter::on_close` and `Filter::on_record` callbacks to allow `Filter`s to track span states internally ([#1973], [#2017], [#2031]) - **registry**: `Filtered::filter` and `Filtered::filter_mut` accessors ([#1959]) - **registry**: `Filtered::inner` and `Filtered::inner_mut` accessors to borrow the wrapped `Layer` ([#2034]) - **layer**: Implement `Layer` for `Vec<L: Layer>`, to allow composing together a dynamically sized list of `Layer`s ([#2027]) - **layer**: `Layer::boxed` method to make type-erasing `Layer`s easier ([#2026]) - **fmt**: `fmt::Layer::writer` and `fmt::Layer::writer_mut` accessors ([#2034]) - **fmt**: `fmt::Layer::set_ansi` method to allow changing the ANSI formatting configuration at runtime ([#2034]) - **env-filter**: `EnvFilter::builder` to configure a new `EnvFilter` prior to parsing it ([#2035]) - Several documentation fixes and improvements ([#1972], [#1971], [#2023], [#2023]) ### Fixed - **fmt**: `fmt::Layer`'s auto traits no longer depend on the `Subscriber` type parameter's auto traits ([#2025]) - **env-filter**: Fixed missing help text when the `ansi` feature is disabled ([#2029]) Thanks to new contributors @TimoFreiberg and @wagenet, as well as @CAD97 for contributing to this release! [#1983]: #1983 [#1973]: #1973 [#2017]: #2017 [#2031]: #2031 [#1959]: #1959 [#2034]: #2034 [#2027]: #2027 [#2026]: #2026 [#2035]: #2035 [#1972]: #1972 [#1971]: #1971 [#2023]: #2023 [#2025]: #2025 [#2029]: #2029

…#1973) Closes tokio-rs#1955 Call those methods in the `Layer` methods for `Filtered` and delegate them in the filter combinators ## Motivation Currently, if a `Filter` is going to implement dynamic filtering, it must do this by querying the wrapped Subscriber for the current span context. Since `Filter` only has callsite_enabled and enabled methods, a `Filter` implementation cannot track the span context internally, the way a Layer can. Unfortunately, this means that the current implementation of `EnvFilter` can only implement `Layer` (and provide global filtering). It cannot currently implement `Filter`, because it stores span context data internally. See tokio-rs#1868 for details. ## Proposal We should add `on_new_span`, `on_enter`, `on_exit`, and `on_close` methods to `Filter`. This would allow implementing `Filter`s (such as `EnvFilter`) that internally track span states.

Filtering by span and field requires using `EnvFilter` rather than `Targets`. Per-layer filtering requires the `Filter` trait, which `EnvFilter` does not implement. Implement the `Filter` trait for `EnvFilter`. PR tokio-rs#1973 adds additiional methods to the `Filter` trait, which are necessary for `EnvFilter` to implement dynamic span filtering. Now that those methods are added, we can provide a `Filter` impl for `EnvFilter`. In addition, we changed the globally-scoped `thread_local!` macro to use a `ThreadLocal` struct as a field, so that multiple `EnvFilter`s used as per-layer filters don't share a single span scope. Fixes tokio-rs#1868 Follow-up on tokio-rs#1973 Co-authored-by: Eliza Weisman <eliza@buoyant.io>

@TimoFreiberg

# 0.3.10 (Apr 1, 2022) This release adds several new features, including a `Filter` implementation and new builder API for `EnvFilter`, support for using a `Vec<L> where L: Layer` as a `Layer`, and a number of smaller API improvements to make working with dynamic and reloadable layers easier. ### Added - **registry**: Implement `Filter` for `EnvFilter`, allowing it to be used with per-layer filtering ([tokio-rs#1983]) - **registry**: `Filter::on_new_span`, `Filter::on_enter`, `Filter::on_exit`, `Filter::on_close` and `Filter::on_record` callbacks to allow `Filter`s to track span states internally ([tokio-rs#1973], [tokio-rs#2017], [tokio-rs#2031]) - **registry**: `Filtered::filter` and `Filtered::filter_mut` accessors ([tokio-rs#1959]) - **registry**: `Filtered::inner` and `Filtered::inner_mut` accessors to borrow the wrapped `Layer` ([tokio-rs#2034]) - **layer**: Implement `Layer` for `Vec<L: Layer>`, to allow composing together a dynamically sized list of `Layer`s ([tokio-rs#2027]) - **layer**: `Layer::boxed` method to make type-erasing `Layer`s easier ([tokio-rs#2026]) - **fmt**: `fmt::Layer::writer` and `fmt::Layer::writer_mut` accessors ([tokio-rs#2034]) - **fmt**: `fmt::Layer::set_ansi` method to allow changing the ANSI formatting configuration at runtime ([tokio-rs#2034]) - **env-filter**: `EnvFilter::builder` to configure a new `EnvFilter` prior to parsing it ([tokio-rs#2035]) - Several documentation fixes and improvements ([tokio-rs#1972], [tokio-rs#1971], [tokio-rs#2023], [tokio-rs#2023]) ### Fixed - **fmt**: `fmt::Layer`'s auto traits no longer depend on the `Subscriber` type parameter's auto traits ([tokio-rs#2025]) - **env-filter**: Fixed missing help text when the `ansi` feature is disabled ([tokio-rs#2029]) Thanks to new contributors @TimoFreiberg and @wagenet, as well as @CAD97 for contributing to this release! [tokio-rs#1983]: tokio-rs#1983 [tokio-rs#1973]: tokio-rs#1973 [tokio-rs#2017]: tokio-rs#2017 [tokio-rs#2031]: tokio-rs#2031 [tokio-rs#1959]: tokio-rs#1959 [tokio-rs#2034]: tokio-rs#2034 [tokio-rs#2027]: tokio-rs#2027 [tokio-rs#2026]: tokio-rs#2026 [tokio-rs#2035]: tokio-rs#2035 [tokio-rs#1972]: tokio-rs#1972 [tokio-rs#1971]: tokio-rs#1971 [tokio-rs#2023]: tokio-rs#2023 [tokio-rs#2025]: tokio-rs#2025 [tokio-rs#2029]: tokio-rs#2029

Add on_{new_span, enter, exit, close} methods to Filter

e66104b

tfreiberg-fastly requested review from hawkw and a team as code owners March 8, 2022 15:30

tfreiberg-fastly added 2 commits March 8, 2022 17:30

Use new Filter methods in filter combinators

a12c96f

Call new Filter methods in impl Layer for Filtered

0510795

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tfreiberg-fastly and others added 10 commits March 8, 2022 19:24

Update tracing-subscriber/src/filter/layer_filters/combinator.rs

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Co-authored-by: Eliza Weisman <eliza@buoyant.io>

Update tracing-subscriber/src/filter/layer_filters/combinator.rs

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Update tracing-subscriber/src/layer/mod.rs

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Update tracing-subscriber/src/layer/mod.rs

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Update tracing-subscriber/src/layer/mod.rs

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Update tracing-subscriber/src/layer/mod.rs

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Update tracing-subscriber/src/filter/layer_filters/combinator.rs

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Merge branch 'v0.1.x' into 1955-new-filter-methods

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Import instead of fully qualify

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Remove underscores from trait method arg names

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Update tracing-subscriber/src/filter/layer_filters/combinator.rs

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hawkw merged commit 2d27332 into tokio-rs:v0.1.x Mar 8, 2022

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tfreiberg-fastly mentioned this pull request Mar 10, 2022

Impl filter for EnvFilter #1983

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davidbarsky mentioned this pull request Mar 16, 2022

chore: port filters to master #1796

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hawkw mentioned this pull request Apr 1, 2022

subscriber: prepare to release v0.3.10 #2041

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davidbarsky mentioned this pull request Sep 26, 2023

chore: backport roughly a year's worth of changes #2728

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Add new filter methods #1973

Add new filter methods #1973

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Add new filter methods #1973

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