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subscriber: feature flag registry implementation only (#565)

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## Motivation

Currently, both the `Registry` type _and_ the `LookupSpan` and
`SpanData` traits require the "registry" feature flag. This means that
if a user wishes to implement their own custom registry type that
implements `LookupSpan`, they must enable the "registry" feature flag,
which also enables the `Registry` type and its dependencies.

## Solution

This commit changes the feature flag so that only the `Registry` and
`Data` types are conditional on the "registry" feature. The `LookupSpan`
and `SpanData` traits are now always enabled, as they are not much code
& don't require any additional internal dependencies (although if anyone
thinks it's important for them to have their own separate feature flag,
I am willing to change that).

Signed-off-by: Eliza Weisman <eliza@buoyant.io>
This commit is contained in:
Eliza Weisman 2020-02-04 12:44:31 -08:00 committed by GitHub
parent bf6c4d55b7
commit 737eba22a8
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 12 additions and 3 deletions
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2
tracing-subscriber/src/lib.rs
View File

@ -98,8 +98,6 @@ pub mod filter;
pub mod fmt;
pub mod layer;
pub mod prelude;
#[cfg(feature = "registry")]
#[cfg_attr(docsrs, doc(cfg(feature = "registry")))]
pub mod registry;
pub mod reload;
pub(crate) mod sync;

9
tracing-subscriber/src/registry/mod.rs
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@ -68,11 +68,18 @@ use tracing_core::{field::FieldSet, span::Id, Metadata};
/// A module containing a type map of span extensions.
mod extensions;
#[cfg(feature = "registry")]
mod sharded;
#[cfg(feature = "registry")]
mod stack;
pub use extensions::{Extensions, ExtensionsMut};
pub use sharded::{Data, Registry};
#[cfg(feature = "registry")]
#[cfg_attr(docsrs, doc(cfg(feature = "registry")))]
pub use sharded::Data;
#[cfg(feature = "registry")]
#[cfg_attr(docsrs, doc(cfg(feature = "registry")))]
pub use sharded::Registry;
/// Provides access to stored span metadata.
///

4
tracing-subscriber/src/registry/sharded.rs
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@ -43,6 +43,8 @@ use tracing_core::{
/// [`LookupSpan`]: trait.LookupSpan.html
/// [`LookupMetadata`]: trait.LookupMetadata.html
/// [extensions]: extensions/index.html
#[cfg(feature = "registry")]
#[cfg_attr(docsrs, doc(cfg(feature = "registry")))]
#[derive(Debug)]
pub struct Registry {
spans: Slab<DataInner>,
@ -58,6 +60,8 @@ pub struct Registry {
/// [`Registry`]: struct.Registry.html
/// [`Layer`s]: ../trait.Layer.html
/// [extensions]: extensions/index.html
#[cfg(feature = "registry")]
#[cfg_attr(docsrs, doc(cfg(feature = "registry")))]
#[derive(Debug)]
pub struct Data<'a> {
inner: Guard<'a, DataInner>,