CHANGELOG.md

Change Log

Unreleased

[0.4.22] - 2024-06-27

What's Changed

• Add some clarifications to the library docs by @KodrAus in #620
• Add links to colog crate by @chrivers in #621
• adding line_number test + updating some testing infrastructure by @DIvkov575 in #619
• Clarify the actual set of functions that can race in _racy variants by @KodrAus in #623
• Replace deprecated std::sync::atomic::spin_loop_hint() by @Catamantaloedis in #625
• Check usage of max_level features by @Thomasdezeeuw in #627
• Remove unneeded import by @Thomasdezeeuw in #628
• Loosen orderings for logger initialization in #632. Originally by @pwoolcoc in #599
• Use Location::caller() for file and line info in #633. Originally by @Cassy343 in #520

New Contributors

• @chrivers made their first contribution in #621
• @DIvkov575 made their first contribution in #619
• @Catamantaloedis made their first contribution in #625

Full Changelog: https://github.com/rust-lang/log/compare/0.4.21...0.4.22

0.4.21 - 2024-02-27

What's Changed

• Minor clippy nits by @nyurik in #578
• Simplify Display impl by @nyurik in #579
• Set all crates to 2021 edition by @nyurik in #580
• Various changes based on review by @Thomasdezeeuw in #583
• Fix typo in file_static() method doc by @dimo414 in #590
• Specialize empty key value pairs by @EFanZh in #576
• Fix incorrect lifetime in Value::to_str() by @peterjoel in #587
• Remove some API of the key-value feature by @Thomasdezeeuw in #585
• Add logcontrol-log and log-reload by @swsnr in #595
• Add Serialization section to kv::Value docs by @Thomasdezeeuw in #593
• Rename Value::to_str to to_cow_str by @Thomasdezeeuw in #592
• Clarify documentation and simplify initialization of STATIC_MAX_LEVEL by @ptosi in #594
• Update docs to 2021 edition, test by @nyurik in #577
• Add "alterable_logger" link to README.md by @brummer-simon in #589
• Normalize line ending by @EFanZh in #602
• Remove ok_or in favor of Option::ok_or by @AngelicosPhosphoros in #607
• Use Acquire ordering for initialization check by @AngelicosPhosphoros in #610
• Get structured logging API ready for stabilization by @KodrAus in #613

New Contributors

• @nyurik made their first contribution in #578
• @dimo414 made their first contribution in #590
• @peterjoel made their first contribution in #587
• @ptosi made their first contribution in #594
• @brummer-simon made their first contribution in #589
• @AngelicosPhosphoros made their first contribution in #607

0.4.20 - 2023-07-11

• Remove rustversion dev-dependency by @Thomasdezeeuw in #568
• Remove local_inner_macros usage by @EFanZh in #570

0.4.19 - 2023-06-10

• Use target_has_atomic instead of the old atomic_cas cfg by @GuillaumeGomez in #555
• Put MSRV into Cargo.toml by @est31 in #557

0.4.18 - 2023-05-28

• fix Markdown links (again) by @hellow554 in #513
• add cargo doc to workflow by @hellow554 in #515
• Apply Clippy lints by @hellow554 in #516
• Replace ad-hoc eq_ignore_ascii_case with slice::eq_ignore_ascii_case by @glandium in #519
• fix up windows targets by @KodrAus in #528
• typo fix by @jiangying000 in #529
• Remove dependency on cfg_if by @EriKWDev in #536
• GitHub Workflows security hardening by @sashashura in #538
• Fix build status badge by @atouchet in #539
• Add call_logger to the documentation by @a1ecbr0wn in #547
• Use stable internals for key-value API by @KodrAus in #550
• Change wording of list of implementations by @Thomasdezeeuw in #553
• Add std-logger to list of implementations by @Thomasdezeeuw in #554
• Add set_max_level_racy and gate set_max_level by @djkoloski in #544
• [doc] src/lib.rs : prefix an unused variable with an underscore by @OccupyMars2025 in #561
• [doc] src/macros.rs : correct grammar errors of an example in lib documentation by @OccupyMars2025 in #562

0.4.17 - 2022-04-29

• Update kv_unstable internal dependencies.

0.4.16 - 2022-03-22

• Fix a conflict with unqualified Option use in macros.

0.4.15 - 2022-02-23

• Silence a warning about the deprecated spin_loop_hint.
• Relax ordering in the atomic set_max_level call.
• Add thumbv4t-none-eabi to targets that don't support atomics
• Allow levels to be iterated over.
• Implement Log on some common wrapper types.
• Improvements to test coverage.
• Improvements to documentation.
• Add key-value support to the log! macros.
• Tighten kv_unstable internal dependencies, so they don't bump past their current alpha.
• Add a simple visit API to kv_unstable.
• Support NonZero* integers as values in structured logging
• Support static strings as keys in structured logging

0.4.14 - 2021-01-27

• Remove the __private_api_log_lit special case.
• Fixed incorrect combination of kv_unstable and std features causing compile failures.
• Remove unstable Value::to_* conversions that were incorrectly using as.
• Rename unstable Value::to_error to Value::to_borrowed_error.

0.4.13 - 2021-01-11

• This is the same as 0.4.11, except with a kv_unstable_std feature added to aid migrating current dependents to 0.4.14 (which was originally going to be 0.4.13 until it was decided to create a patch from 0.4.11 to minimize disruption).

0.4.12 - 2020-12-24

New

• Support platforms without atomics by racing instead of failing to compile
• Implement Log for Box<T: Log>
• Update cfg-if to 1.0
• Internal reworks of the structured logging API. Removed the Fill API and added source::as_map and source::as_list to easily serialize a Source as either a map of {key: value, ..} or as a list of [(key, value), ..].

Fixed

• Fixed deserialization of LevelFilter to use their u64 index variants

0.4.11 - 2020-07-09

New

• Support coercing structured values into concrete types.
• Reference the win_dbg_logger in the readme.

Fixed

• Updates a few deprecated items used internally.
• Fixed issues in docs and expands sections.
• Show the correct build badge in the readme.
• Fix up a possible inference breakage with structured value errors.
• Respect formatting flags in structured value formatting.

0.4.10 - 2019-12-16 (yanked)

Fixed

• Fixed the log! macros, so they work in expression context (this regressed in 0.4.9, which has been yanked).

0.4.9 - 2019-12-12 (yanked)

Minimum Supported Rust Version

This release bumps the minimum compiler version to 1.31.0. This was mainly needed for cfg-if, but between 1.16.0 and 1.31.0 there are a lot of language and library improvements we now take advantage of.

New

• Unstable support for capturing key-value pairs in a record using the log! macros

Improved

• Better documentation for max level filters.
• Internal updates to line up with bumped MSRV

0.4.8 - 2019-07-28

New

• Support attempting to get Record fields as static strings.

0.4.7 - 2019-07-06

New

• Support for embedded environments with thread-unsafe initialization.
• Initial unstable support for capturing structured data under the kv_unstable feature gate. This new API doesn't affect existing users and may change in future patches (so those changes may not appear in the changelog until it stabilizes).

Improved

• Docs for using log with the 2018 edition.
• Error messages for macros missing arguments.

0.4.6 - 2018-10-27

Improved

• Support 2018-style macro import for the log_enabled! macro.

0.4.5 - 2018-09-03

Improved

• Make log's internal helper macros less likely to conflict with user-defined macros.

0.4.4 - 2018-08-17

Improved

• Support 2018-style imports of the log macros.

0.4.3 - 2018-06-29

Improved

• More code generation improvements.

0.4.2 - 2018-06-05

Improved

• Log invocations now generate less code.

Fixed

• Example Logger implementations now properly set the max log level.

0.4.1 - 2017-12-30

Fixed

• Some doc links were fixed.

0.4.0 - 2017-12-24

The changes in this release include cleanup of some obscure functionality and a more robust public API designed to support bridges to other logging systems, and provide more flexibility to new features in the future.

Compatibility

Vast portions of the Rust ecosystem use the 0.3.x release series of log, and we don't want to force the community to go through the pain of upgrading every crate to 0.4.x at the exact same time. Along with 0.4.0, we've published a new 0.3.9 release which acts as a "shim" over 0.4.0. This will allow crates using either version to coexist without losing messages from one side or the other.

There is one caveat - a log message generated by a crate using 0.4.x but consumed by a logging implementation using 0.3.x will not have a file name or module path. Applications affected by this can upgrade their logging implementations to one using 0.4.x to avoid losing this information. The other direction does not lose any information, fortunately!

TL;DR Libraries should feel comfortable upgrading to 0.4.0 without treating that as a breaking change. Applications may need to update their logging implementation (e.g. env-logger) to a newer version using log 0.4.x to avoid losing module and file information.

New

• The crate is now no_std by default.
• Level and LevelFilter now implement Serialize and Deserialize when the serde feature is enabled.
• The Record and Metadata types can now be constructed by third-party code via a builder API.
• The logger free function returns a reference to the logger implementation. This, along with the ability to construct Records, makes it possible to bridge from another logging framework to this one without digging into the private internals of the crate. The standard error! warn!, etc., macros now exclusively use the public API of the crate rather than "secret" internal APIs.
• Log::flush has been added to allow crates to tell the logging implementation to ensure that all "in flight" log events have been persisted. This can be used, for example, just before an application exits to ensure that asynchronous log sinks finish their work.

Removed

• The shutdown and shutdown_raw functions have been removed. Supporting shutdown significantly complicated the implementation and imposed a performance cost on each logging operation.
• The log_panics function and its associated nightly Cargo feature have been removed. Use the log-panics instead.

Changed

• The Log prefix has been removed from type names. For example, LogLevelFilter is now LevelFilter, and LogRecord is now Record.
• The MaxLogLevelFilter object has been removed in favor of a set_max_level free function.
• The set_logger free functions have been restructured. The logger is now directly passed to the functions rather than a closure which returns the logger. set_logger now takes a &'static Log and is usable in no_std contexts in place of the old set_logger_raw. set_boxed_logger is a convenience function which takes a Box<Log> but otherwise acts like set_logger. It requires the std feature.
• The file and module_path values in Record no longer have the 'static lifetime to support integration with other logging frameworks that don't provide a 'static lifetime for the equivalent values.
• The file, line, and module_path values in Record are now Options to support integration with other logging frameworks that don't provide those values.

In the Future

• We're looking to add support for structured logging - the inclusion of extra key-value pairs of information in a log event in addition to the normal string message. This should be able to be added in a backwards compatible manner to the 0.4.x series when the design is worked out.

Older

Look at the release tags for information about older releases.