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History

James Liu 29b265dd9c core, subscriber: migrate from lazy_static to once_cell (#2147 )

Replace `lazy_static` with `once_cell`. Fixes #2146.

## Motivation

`lazy_static!`, while a declarative macro, is a macro nonetheless. It
can add quite a bit of additional compilation time cost.
`once_cell::sync::Lazy` does the same thing with generics, and can be
used more flexibly (i.e. non-static lazily initialized values), and has
been proposed to be added to `std` (see linked issue).

I'm trying to reduce the compile time and dependency tree complexity of
a dependent project: [bevy](https://bevyengine.org), which is using
tracing. `lazy_static` and `once_cell` are both in our dependency tree
and both end up doing the same thing.

## Solution

Migrate to `once_cell`.

2022-06-07 10:01:02 -07:00

benches

log: add an interest cache for logs emitted through the log crate (#1636 )

2021-10-18 09:23:35 -07:00

src

core, subscriber: migrate from lazy_static to once_cell (#2147 )

2022-06-07 10:01:02 -07:00

tests

log: fix LogTracer not honoring max level filters (#1543 )

2021-09-11 12:15:29 -07:00

Cargo.toml

core, subscriber: migrate from lazy_static to once_cell (#2147 )

2022-06-07 10:01:02 -07:00

CHANGELOG.md

log: prepare to release v0.1.3 (#2086 )

2022-04-21 13:14:50 -07:00

LICENSE

chore: Include the LICENSE in every crate (#842 )

2020-07-23 12:23:04 -07:00

README.md

chore: update MSRVs from 1.42 to 1.49 (#1913 )

2022-02-07 15:39:26 -08:00

README.md

tracing-log

log compatibility for tracing.

Documentation | Chat (discord)

Overview

tracing is a framework for instrumenting Rust programs with context-aware, structured, event-based diagnostic information. This crate provides compatibility layers for using tracing alongside the logging facade provided by the log crate.

This crate provides:

AsTrace and AsLog traits for converting between tracing and log types.
LogTracer, a log::Log implementation that consumes log::Records and outputs them as tracing::Events.
An [env_logger] module, with helpers for using the [env_logger crate] with tracing (optional, enabled by the env_logger feature).

Compiler support: requires rustc 1.49+

Supported Rust Versions

Tracing is built against the latest stable release. The minimum supported version is 1.49. The current Tracing version is not guaranteed to build on Rust versions earlier than the minimum supported version.

Tracing follows the same compiler support policies as the rest of the Tokio project. The current stable Rust compiler and the three most recent minor versions before it will always be supported. For example, if the current stable compiler version is 1.45, the minimum supported version will not be increased past 1.42, three minor versions prior. Increasing the minimum supported compiler version is not considered a semver breaking change as long as doing so complies with this policy.

License

This project is licensed under the MIT license.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in Tracing by you, shall be licensed as MIT, without any additional terms or conditions.