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Signed-off-by: Valentin Popov <valentin@popov.link>
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{"files":{"CHANGELOG.md":"4cf5d5c08ecf2cca9bfc6c0393fb06375675e1a712cd0da17426d54dd6b26281","Cargo.toml":"400053190237140d908218465ab8942fe65196c43925be6faef37e284b5817ff","LICENSE-APACHE":"a60eea817514531668d7e00765731449fe14d059d3249e0bc93b36de45f759f2","LICENSE-MIT":"6485b8ed310d3f0340bf1ad1f47645069ce4069dcc6bb46c7d5c6faf41de1fdb","README.md":"788bda1deb337541be7ddaf8a7483d1c315f008aeab72374973135ad490e06c4","benches/value.rs":"6ce7689c8c714c93fa58afa984aefe54f0fc279fdd69e1582d013c97d1688eba","src/__private_api.rs":"de6799f0772181878a2fbfb93146641243a86f1115f2e8234a255d70105e2e65","src/kv/error.rs":"5dea46a9eb2128442a60f7f8a0e0b9e5f155bc0e9ecc5134f91e466cb04c8a31","src/kv/key.rs":"941979c92db5f9b999b9eba4f96a8d43da034da80849fbfa65277f122b5fc39f","src/kv/mod.rs":"3592b750c206d5a36545d0c5f2e5db79c499c3f96dced13c5aeeacc7409b4ff6","src/kv/source.rs":"4fd7f0083caef44094984c02bd3d15d7e5fd6b95e809b2d6abab31aa8d01f5c3","src/kv/value.rs":"7f0ee0327dcfbb3df3ed4f0c8caed4bebd4b76bb7407f32f100d660f2a10eabd","src/lib.rs":"1332fb825d498244bf068ce929d744c7316888c7f99e4711149af69ed028730c","src/macros.rs":"f0604416b1a839ba84509c17bff3741766cfa401cb09c0b00e33c36ae1c710ad","src/serde.rs":"1f8614b42ffb1b34bdf58ce3ab6584b760a8a9e9aa6e00b27dc229cbc46f0a2b","triagebot.toml":"a135e10c777cd13459559bdf74fb704c1379af7c9b0f70bc49fa6f5a837daa81"},"package":"b5e6163cb8c49088c2c36f57875e58ccd8c87c7427f7fbd50ea6710b2f3f2e8f"}

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# Change Log
## [Unreleased]
## [0.4.20] - 2023-07-11
* Remove rustversion dev-dependency by @Thomasdezeeuw in https://github.com/rust-lang/log/pull/568
* Remove `local_inner_macros` usage by @EFanZh in https://github.com/rust-lang/log/pull/570
## [0.4.19] - 2023-06-10
* Use target_has_atomic instead of the old atomic_cas cfg by @GuillaumeGomez in https://github.com/rust-lang/log/pull/555
* Put MSRV into Cargo.toml by @est31 in https://github.com/rust-lang/log/pull/557
## [0.4.18] - 2023-05-28
* fix markdown links (again) by @hellow554 in https://github.com/rust-lang/log/pull/513
* add cargo doc to workflow by @hellow554 in https://github.com/rust-lang/log/pull/515
* Apply Clippy lints by @hellow554 in https://github.com/rust-lang/log/pull/516
* Replace ad-hoc eq_ignore_ascii_case with slice::eq_ignore_ascii_case by @glandium in https://github.com/rust-lang/log/pull/519
* fix up windows targets by @KodrAus in https://github.com/rust-lang/log/pull/528
* typo fix by @jiangying000 in https://github.com/rust-lang/log/pull/529
* Remove dependency on cfg_if by @EriKWDev in https://github.com/rust-lang/log/pull/536
* GitHub Workflows security hardening by @sashashura in https://github.com/rust-lang/log/pull/538
* Fix build status badge by @atouchet in https://github.com/rust-lang/log/pull/539
* Add call_logger to the documentation by @a1ecbr0wn in https://github.com/rust-lang/log/pull/547
* Use stable internals for key-value API by @KodrAus in https://github.com/rust-lang/log/pull/550
* Change wording of list of implementations by @Thomasdezeeuw in https://github.com/rust-lang/log/pull/553
* Add std-logger to list of implementations by @Thomasdezeeuw in https://github.com/rust-lang/log/pull/554
* Add `set_max_level_racy` and gate `set_max_level` by @djkoloski in https://github.com/rust-lang/log/pull/544
* [doc] src/lib.rs : prefix an unused variable with an underscore by @OccupyMars2025 in https://github.com/rust-lang/log/pull/561
* [doc] src/macros.rs : correct grammar errors of an example in lib documentation by @OccupyMars2025 in https://github.com/rust-lang/log/pull/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 `Record`s, 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](https://crates.io/crates/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 `Option`s 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.
[Unreleased]: https://github.com/rust-lang-nursery/log/compare/0.4.18...HEAD
[0.4.20]: https://github.com/rust-lang-nursery/log/compare/0.4.19...0.4.20
[0.4.19]: https://github.com/rust-lang-nursery/log/compare/0.4.18...0.4.19
[0.4.18]: https://github.com/rust-lang-nursery/log/compare/0.4.17...0.4.18
[0.4.17]: https://github.com/rust-lang-nursery/log/compare/0.4.16...0.4.17
[0.4.16]: https://github.com/rust-lang-nursery/log/compare/0.4.15...0.4.16
[0.4.15]: https://github.com/rust-lang-nursery/log/compare/0.4.13...0.4.15
[0.4.14]: https://github.com/rust-lang-nursery/log/compare/0.4.13...0.4.14
[0.4.13]: https://github.com/rust-lang-nursery/log/compare/0.4.11...0.4.13
[0.4.12]: https://github.com/rust-lang-nursery/log/compare/0.4.11...0.4.12
[0.4.11]: https://github.com/rust-lang-nursery/log/compare/0.4.10...0.4.11
[0.4.10]: https://github.com/rust-lang-nursery/log/compare/0.4.9...0.4.10
[0.4.9]: https://github.com/rust-lang-nursery/log/compare/0.4.8...0.4.9
[0.4.8]: https://github.com/rust-lang-nursery/log/compare/0.4.7...0.4.8
[0.4.7]: https://github.com/rust-lang-nursery/log/compare/0.4.6...0.4.7
[0.4.6]: https://github.com/rust-lang-nursery/log/compare/0.4.5...0.4.6
[0.4.5]: https://github.com/rust-lang-nursery/log/compare/0.4.4...0.4.5
[0.4.4]: https://github.com/rust-lang-nursery/log/compare/0.4.3...0.4.4
[0.4.3]: https://github.com/rust-lang-nursery/log/compare/0.4.2...0.4.3
[0.4.2]: https://github.com/rust-lang-nursery/log/compare/0.4.1...0.4.2
[0.4.1]: https://github.com/rust-lang-nursery/log/compare/0.4.0...0.4.1
[0.4.0]: https://github.com/rust-lang-nursery/log/compare/0.3.8...0.4.0
[release tags]: https://github.com/rust-lang-nursery/log/releases

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# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
#
# When uploading crates to the registry Cargo will automatically
# "normalize" Cargo.toml files for maximal compatibility
# with all versions of Cargo and also rewrite `path` dependencies
# to registry (e.g., crates.io) dependencies.
#
# If you are reading this file be aware that the original Cargo.toml
# will likely look very different (and much more reasonable).
# See Cargo.toml.orig for the original contents.
[package]
rust-version = "1.60.0"
name = "log"
version = "0.4.20"
authors = ["The Rust Project Developers"]
exclude = ["rfcs/**/*"]
description = """
A lightweight logging facade for Rust
"""
documentation = "https://docs.rs/log"
readme = "README.md"
keywords = ["logging"]
categories = ["development-tools::debugging"]
license = "MIT OR Apache-2.0"
repository = "https://github.com/rust-lang/log"
[package.metadata.docs.rs]
features = [
"std",
"serde",
"kv_unstable_std",
"kv_unstable_sval",
"kv_unstable_serde",
]
[[test]]
name = "filters"
path = "tests/filters.rs"
harness = false
[[test]]
name = "macros"
path = "tests/macros.rs"
harness = true
[dependencies.serde]
version = "1.0"
optional = true
default-features = false
[dependencies.sval]
version = "2.1"
optional = true
default-features = false
[dependencies.sval_ref]
version = "2.1"
optional = true
default-features = false
[dependencies.value-bag]
version = "1.4"
optional = true
default-features = false
[dev-dependencies.proc-macro2]
version = "1.0.63"
default-features = false
[dev-dependencies.serde]
version = "1.0"
features = ["derive"]
[dev-dependencies.serde_test]
version = "1.0"
[dev-dependencies.sval]
version = "2.1"
[dev-dependencies.sval_derive]
version = "2.1"
[dev-dependencies.value-bag]
version = "1.4"
features = ["test"]
[features]
kv_unstable = ["value-bag"]
kv_unstable_serde = [
"kv_unstable_std",
"value-bag/serde",
"serde",
]
kv_unstable_std = [
"std",
"kv_unstable",
"value-bag/error",
]
kv_unstable_sval = [
"kv_unstable",
"value-bag/sval",
"sval",
"sval_ref",
]
max_level_debug = []
max_level_error = []
max_level_info = []
max_level_off = []
max_level_trace = []
max_level_warn = []
release_max_level_debug = []
release_max_level_error = []
release_max_level_info = []
release_max_level_off = []
release_max_level_trace = []
release_max_level_warn = []
std = []

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comment syntax for the file format. We also recommend that a
file or class name and description of purpose be included on the
same "printed page" as the copyright notice for easier
identification within third-party archives.
Copyright [yyyy] [name of copyright owner]
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

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Copyright (c) 2014 The Rust Project Developers
Permission is hereby granted, free of charge, to any
person obtaining a copy of this software and associated
documentation files (the "Software"), to deal in the
Software without restriction, including without
limitation the rights to use, copy, modify, merge,
publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software
is furnished to do so, subject to the following
conditions:
The above copyright notice and this permission notice
shall be included in all copies or substantial portions
of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.

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log
===
A Rust library providing a lightweight logging *facade*.
[![Build status](https://img.shields.io/github/actions/workflow/status/rust-lang/log/main.yml?branch=master)](https://github.com/rust-lang/log/actions)
[![Latest version](https://img.shields.io/crates/v/log.svg)](https://crates.io/crates/log)
[![Documentation](https://docs.rs/log/badge.svg)](https://docs.rs/log)
![License](https://img.shields.io/crates/l/log.svg)
* [`log` documentation](https://docs.rs/log)
A logging facade provides a single logging API that abstracts over the actual
logging implementation. Libraries can use the logging API provided by this
crate, and the consumer of those libraries can choose the logging
implementation that is most suitable for its use case.
## Minimum supported `rustc`
`1.60.0+`
This version is explicitly tested in CI and may be bumped in any release as needed. Maintaining compatibility with older compilers is a priority though, so the bar for bumping the minimum supported version is set very high. Any changes to the supported minimum version will be called out in the release notes.
## Usage
### In libraries
Libraries should link only to the `log` crate, and use the provided macros to
log whatever information will be useful to downstream consumers:
```toml
[dependencies]
log = "0.4"
```
```rust
use log::{info, trace, warn};
pub fn shave_the_yak(yak: &mut Yak) {
trace!("Commencing yak shaving");
loop {
match find_a_razor() {
Ok(razor) => {
info!("Razor located: {}", razor);
yak.shave(razor);
break;
}
Err(err) => {
warn!("Unable to locate a razor: {}, retrying", err);
}
}
}
}
```
### In executables
In order to produce log output, executables have to use a logger implementation compatible with the facade.
There are many available implementations to choose from, here are some options:
* Simple minimal loggers:
* [`env_logger`](https://docs.rs/env_logger/*/env_logger/)
* [`simple_logger`](https://docs.rs/simple_logger/*/simple_logger/)
* [`simplelog`](https://docs.rs/simplelog/*/simplelog/)
* [`pretty_env_logger`](https://docs.rs/pretty_env_logger/*/pretty_env_logger/)
* [`stderrlog`](https://docs.rs/stderrlog/*/stderrlog/)
* [`flexi_logger`](https://docs.rs/flexi_logger/*/flexi_logger/)
* [`call_logger`](https://docs.rs/call_logger/*/call_logger/)
* [`std-logger`](https://docs.rs/std-logger/*/std_logger/)
* [`structured-logger`](https://docs.rs/structured-logger/latest/structured_logger/)
* Complex configurable frameworks:
* [`log4rs`](https://docs.rs/log4rs/*/log4rs/)
* [`fern`](https://docs.rs/fern/*/fern/)
* Adaptors for other facilities:
* [`syslog`](https://docs.rs/syslog/*/syslog/)
* [`systemd-journal-logger`](https://docs.rs/systemd-journal-logger/*/systemd_journal_logger/)
* [`slog-stdlog`](https://docs.rs/slog-stdlog/*/slog_stdlog/)
* [`android_log`](https://docs.rs/android_log/*/android_log/)
* [`win_dbg_logger`](https://docs.rs/win_dbg_logger/*/win_dbg_logger/)
* [`db_logger`](https://docs.rs/db_logger/*/db_logger/)
* [`log-to-defmt`](https://docs.rs/log-to-defmt/*/log_to_defmt/)
* For WebAssembly binaries:
* [`console_log`](https://docs.rs/console_log/*/console_log/)
* For dynamic libraries:
* You may need to construct [an FFI-safe wrapper over `log`](https://github.com/rust-lang/log/issues/421) to initialize in your libraries.
* Utilities:
* [`log_err`](https://docs.rs/log_err/*/log_err/)
Executables should choose a logger implementation and initialize it early in the
runtime of the program. Logger implementations will typically include a
function to do this. Any log messages generated before the logger is
initialized will be ignored.
The executable itself may use the `log` crate to log as well.
## Structured logging
If you enable the `kv_unstable` feature, you can associate structured data with your log records:
```rust
use log::{info, trace, warn, as_serde, as_error};
pub fn shave_the_yak(yak: &mut Yak) {
trace!(target = "yak_events", yak = as_serde!(yak); "Commencing yak shaving");
loop {
match find_a_razor() {
Ok(razor) => {
info!(razor = razor; "Razor located");
yak.shave(razor);
break;
}
Err(err) => {
warn!(err = as_error!(err); "Unable to locate a razor, retrying");
}
}
}
}
```

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#![cfg(feature = "kv_unstable")]
#![feature(test)]
extern crate log;
extern crate test;
use log::kv::Value;
#[bench]
fn u8_to_value(b: &mut test::Bencher) {
b.iter(|| Value::from(1u8))
}
#[bench]
fn u8_to_value_debug(b: &mut test::Bencher) {
b.iter(|| Value::from_debug(&1u8))
}
#[bench]
fn str_to_value_debug(b: &mut test::Bencher) {
b.iter(|| Value::from_debug(&"a string"))
}
#[bench]
fn custom_to_value_debug(b: &mut test::Bencher) {
#[derive(Debug)]
struct A;
b.iter(|| Value::from_debug(&A))
}

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//! WARNING: this is not part of the crate's public API and is subject to change at any time
use crate::{Level, Metadata, Record};
use std::fmt::Arguments;
pub use std::option::Option;
pub use std::{file, format_args, line, module_path, stringify};
#[cfg(not(feature = "kv_unstable"))]
pub fn log(
args: Arguments,
level: Level,
&(target, module_path, file): &(&str, &'static str, &'static str),
line: u32,
kvs: Option<&[(&str, &str)]>,
) {
if kvs.is_some() {
panic!(
"key-value support is experimental and must be enabled using the `kv_unstable` feature"
)
}
crate::logger().log(
&Record::builder()
.args(args)
.level(level)
.target(target)
.module_path_static(Some(module_path))
.file_static(Some(file))
.line(Some(line))
.build(),
);
}
#[cfg(feature = "kv_unstable")]
pub fn log(
args: Arguments,
level: Level,
&(target, module_path, file): &(&str, &'static str, &'static str),
line: u32,
kvs: Option<&[(&str, &dyn crate::kv::ToValue)]>,
) {
crate::logger().log(
&Record::builder()
.args(args)
.level(level)
.target(target)
.module_path_static(Some(module_path))
.file_static(Some(file))
.line(Some(line))
.key_values(&kvs)
.build(),
);
}
pub fn enabled(level: Level, target: &str) -> bool {
crate::logger().enabled(&Metadata::builder().level(level).target(target).build())
}

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use std::fmt;
/// An error encountered while working with structured data.
#[derive(Debug)]
pub struct Error {
inner: Inner,
}
#[derive(Debug)]
enum Inner {
#[cfg(feature = "std")]
Boxed(std_support::BoxedError),
Msg(&'static str),
Value(value_bag::Error),
Fmt,
}
impl Error {
/// Create an error from a message.
pub fn msg(msg: &'static str) -> Self {
Error {
inner: Inner::Msg(msg),
}
}
// Not public so we don't leak the `value_bag` API
pub(super) fn from_value(err: value_bag::Error) -> Self {
Error {
inner: Inner::Value(err),
}
}
// Not public so we don't leak the `value_bag` API
pub(super) fn into_value(self) -> value_bag::Error {
match self.inner {
Inner::Value(err) => err,
#[cfg(feature = "kv_unstable_std")]
_ => value_bag::Error::boxed(self),
#[cfg(not(feature = "kv_unstable_std"))]
_ => value_bag::Error::msg("error inspecting a value"),
}
}
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
use self::Inner::*;
match &self.inner {
#[cfg(feature = "std")]
&Boxed(ref err) => err.fmt(f),
&Value(ref err) => err.fmt(f),
&Msg(ref msg) => msg.fmt(f),
&Fmt => fmt::Error.fmt(f),
}
}
}
impl From<fmt::Error> for Error {
fn from(_: fmt::Error) -> Self {
Error { inner: Inner::Fmt }
}
}
#[cfg(feature = "std")]
mod std_support {
use super::*;
use std::{error, io};
pub(super) type BoxedError = Box<dyn error::Error + Send + Sync>;
impl Error {
/// Create an error from a standard error type.
pub fn boxed<E>(err: E) -> Self
where
E: Into<BoxedError>,
{
Error {
inner: Inner::Boxed(err.into()),
}
}
}
impl error::Error for Error {}
impl From<io::Error> for Error {
fn from(err: io::Error) -> Self {
Error::boxed(err)
}
}
}

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//! Structured keys.
use std::borrow::Borrow;
use std::fmt;
/// A type that can be converted into a [`Key`](struct.Key.html).
pub trait ToKey {
/// Perform the conversion.
fn to_key(&self) -> Key;
}
impl<'a, T> ToKey for &'a T
where
T: ToKey + ?Sized,
{
fn to_key(&self) -> Key {
(**self).to_key()
}
}
impl<'k> ToKey for Key<'k> {
fn to_key(&self) -> Key {
Key { key: self.key }
}
}
impl ToKey for str {
fn to_key(&self) -> Key {
Key::from_str(self)
}
}
/// A key in a structured key-value pair.
// These impls must only be based on the as_str() representation of the key
// If a new field (such as an optional index) is added to the key they must not affect comparison
#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct Key<'k> {
key: &'k str,
}
impl<'k> Key<'k> {
/// Get a key from a borrowed string.
pub fn from_str(key: &'k str) -> Self {
Key { key }
}
/// Get a borrowed string from this key.
pub fn as_str(&self) -> &str {
self.key
}
/// Try get a string borrowed for the `'k` lifetime from this key.
pub fn to_borrowed_str(&self) -> Option<&'k str> {
// NOTE: This API leaves room for keys to be owned
Some(self.key)
}
}
impl<'k> fmt::Display for Key<'k> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
self.key.fmt(f)
}
}
impl<'k> AsRef<str> for Key<'k> {
fn as_ref(&self) -> &str {
self.as_str()
}
}
impl<'k> Borrow<str> for Key<'k> {
fn borrow(&self) -> &str {
self.as_str()
}
}
impl<'k> From<&'k str> for Key<'k> {
fn from(s: &'k str) -> Self {
Key::from_str(s)
}
}
#[cfg(feature = "std")]
mod std_support {
use super::*;
use std::borrow::Cow;
impl ToKey for String {
fn to_key(&self) -> Key {
Key::from_str(self)
}
}
impl<'a> ToKey for Cow<'a, str> {
fn to_key(&self) -> Key {
Key::from_str(self)
}
}
}
#[cfg(feature = "kv_unstable_sval")]
mod sval_support {
use super::*;
extern crate sval;
extern crate sval_ref;
use self::sval::Value;
use self::sval_ref::ValueRef;
impl<'a> Value for Key<'a> {
fn stream<'sval, S: sval::Stream<'sval> + ?Sized>(
&'sval self,
stream: &mut S,
) -> sval::Result {
self.key.stream(stream)
}
}
impl<'a> ValueRef<'a> for Key<'a> {
fn stream_ref<S: self::sval::Stream<'a> + ?Sized>(
&self,
stream: &mut S,
) -> self::sval::Result {
self.key.stream(stream)
}
}
}
#[cfg(feature = "kv_unstable_serde")]
mod serde_support {
use super::*;
extern crate serde;
use self::serde::{Serialize, Serializer};
impl<'a> Serialize for Key<'a> {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
self.key.serialize(serializer)
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn key_from_string() {
assert_eq!("a key", Key::from_str("a key").as_str());
}
}

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//! **UNSTABLE:** Structured key-value pairs.
//!
//! This module is unstable and breaking changes may be made
//! at any time. See [the tracking issue](https://github.com/rust-lang-nursery/log/issues/328)
//! for more details.
//!
//! Add the `kv_unstable` feature to your `Cargo.toml` to enable
//! this module:
//!
//! ```toml
//! [dependencies.log]
//! features = ["kv_unstable"]
//! ```
mod error;
mod key;
pub mod source;
pub mod value;
pub use self::error::Error;
pub use self::key::{Key, ToKey};
pub use self::source::{Source, Visitor};
#[doc(inline)]
pub use self::value::{ToValue, Value};

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//! Sources for key-value pairs.
#[cfg(feature = "kv_unstable_sval")]
extern crate sval;
#[cfg(feature = "kv_unstable_sval")]
extern crate sval_ref;
#[cfg(feature = "kv_unstable_serde")]
extern crate serde;
use kv::{Error, Key, ToKey, ToValue, Value};
use std::fmt;
/// A source of key-value pairs.
///
/// The source may be a single pair, a set of pairs, or a filter over a set of pairs.
/// Use the [`Visitor`](trait.Visitor.html) trait to inspect the structured data
/// in a source.
pub trait Source {
/// Visit key-value pairs.
///
/// A source doesn't have to guarantee any ordering or uniqueness of key-value pairs.
/// If the given visitor returns an error then the source may early-return with it,
/// even if there are more key-value pairs.
///
/// # Implementation notes
///
/// A source should yield the same key-value pairs to a subsequent visitor unless
/// that visitor itself fails.
fn visit<'kvs>(&'kvs self, visitor: &mut dyn Visitor<'kvs>) -> Result<(), Error>;
/// Get the value for a given key.
///
/// If the key appears multiple times in the source then which key is returned
/// is implementation specific.
///
/// # Implementation notes
///
/// A source that can provide a more efficient implementation of this method
/// should override it.
#[cfg(not(test))]
fn get<'v>(&'v self, key: Key) -> Option<Value<'v>> {
get_default(self, key)
}
#[cfg(test)]
fn get<'v>(&'v self, key: Key) -> Option<Value<'v>>;
/// Count the number of key-value pairs that can be visited.
///
/// # Implementation notes
///
/// A source that knows the number of key-value pairs upfront may provide a more
/// efficient implementation.
///
/// A subsequent call to `visit` should yield the same number of key-value pairs
/// to the visitor, unless that visitor fails part way through.
#[cfg(not(test))]
fn count(&self) -> usize {
count_default(self)
}
#[cfg(test)]
fn count(&self) -> usize;
}
/// The default implemention of `Source::get`
pub(crate) fn get_default<'v>(source: &'v (impl Source + ?Sized), key: Key) -> Option<Value<'v>> {
struct Get<'k, 'v> {
key: Key<'k>,
found: Option<Value<'v>>,
}
impl<'k, 'kvs> Visitor<'kvs> for Get<'k, 'kvs> {
fn visit_pair(&mut self, key: Key<'kvs>, value: Value<'kvs>) -> Result<(), Error> {
if self.key == key {
self.found = Some(value);
}
Ok(())
}
}
let mut get = Get { key, found: None };
let _ = source.visit(&mut get);
get.found
}
/// The default implementation of `Source::count`.
pub(crate) fn count_default(source: impl Source) -> usize {
struct Count(usize);
impl<'kvs> Visitor<'kvs> for Count {
fn visit_pair(&mut self, _: Key<'kvs>, _: Value<'kvs>) -> Result<(), Error> {
self.0 += 1;
Ok(())
}
}
let mut count = Count(0);
let _ = source.visit(&mut count);
count.0
}
impl<'a, T> Source for &'a T
where
T: Source + ?Sized,
{
fn visit<'kvs>(&'kvs self, visitor: &mut dyn Visitor<'kvs>) -> Result<(), Error> {
Source::visit(&**self, visitor)
}
fn get<'v>(&'v self, key: Key) -> Option<Value<'v>> {
Source::get(&**self, key)
}
fn count(&self) -> usize {
Source::count(&**self)
}
}
impl<K, V> Source for (K, V)
where
K: ToKey,
V: ToValue,
{
fn visit<'kvs>(&'kvs self, visitor: &mut dyn Visitor<'kvs>) -> Result<(), Error> {
visitor.visit_pair(self.0.to_key(), self.1.to_value())
}
fn get<'v>(&'v self, key: Key) -> Option<Value<'v>> {
if self.0.to_key() == key {
Some(self.1.to_value())
} else {
None
}
}
fn count(&self) -> usize {
1
}
}
impl<S> Source for [S]
where
S: Source,
{
fn visit<'kvs>(&'kvs self, visitor: &mut dyn Visitor<'kvs>) -> Result<(), Error> {
for source in self {
source.visit(visitor)?;
}
Ok(())
}
fn get<'v>(&'v self, key: Key) -> Option<Value<'v>> {
for source in self {
if let Some(found) = source.get(key.clone()) {
return Some(found);
}
}
None
}
fn count(&self) -> usize {
self.len()
}
}
impl<S> Source for Option<S>
where
S: Source,
{
fn visit<'kvs>(&'kvs self, visitor: &mut dyn Visitor<'kvs>) -> Result<(), Error> {
if let Some(ref source) = *self {
source.visit(visitor)?;
}
Ok(())
}
fn get<'v>(&'v self, key: Key) -> Option<Value<'v>> {
self.as_ref().and_then(|s| s.get(key))
}
fn count(&self) -> usize {
self.as_ref().map(Source::count).unwrap_or(0)
}
}
/// A visitor for the key-value pairs in a [`Source`](trait.Source.html).
pub trait Visitor<'kvs> {
/// Visit a key-value pair.
fn visit_pair(&mut self, key: Key<'kvs>, value: Value<'kvs>) -> Result<(), Error>;
}
impl<'a, 'kvs, T> Visitor<'kvs> for &'a mut T
where
T: Visitor<'kvs> + ?Sized,
{
fn visit_pair(&mut self, key: Key<'kvs>, value: Value<'kvs>) -> Result<(), Error> {
(**self).visit_pair(key, value)
}
}
impl<'a, 'b: 'a, 'kvs> Visitor<'kvs> for fmt::DebugMap<'a, 'b> {
fn visit_pair(&mut self, key: Key<'kvs>, value: Value<'kvs>) -> Result<(), Error> {
self.entry(&key, &value);
Ok(())
}
}
impl<'a, 'b: 'a, 'kvs> Visitor<'kvs> for fmt::DebugList<'a, 'b> {
fn visit_pair(&mut self, key: Key<'kvs>, value: Value<'kvs>) -> Result<(), Error> {
self.entry(&(key, value));
Ok(())
}
}
impl<'a, 'b: 'a, 'kvs> Visitor<'kvs> for fmt::DebugSet<'a, 'b> {
fn visit_pair(&mut self, key: Key<'kvs>, value: Value<'kvs>) -> Result<(), Error> {
self.entry(&(key, value));
Ok(())
}
}
impl<'a, 'b: 'a, 'kvs> Visitor<'kvs> for fmt::DebugTuple<'a, 'b> {
fn visit_pair(&mut self, key: Key<'kvs>, value: Value<'kvs>) -> Result<(), Error> {
self.field(&key);
self.field(&value);
Ok(())
}
}
#[cfg(feature = "std")]
mod std_support {
use super::*;
use std::borrow::Borrow;
use std::collections::{BTreeMap, HashMap};
use std::hash::{BuildHasher, Hash};
impl<S> Source for Box<S>
where
S: Source + ?Sized,
{
fn visit<'kvs>(&'kvs self, visitor: &mut dyn Visitor<'kvs>) -> Result<(), Error> {
Source::visit(&**self, visitor)
}
fn get<'v>(&'v self, key: Key) -> Option<Value<'v>> {
Source::get(&**self, key)
}
fn count(&self) -> usize {
Source::count(&**self)
}
}
impl<S> Source for Vec<S>
where
S: Source,
{
fn visit<'kvs>(&'kvs self, visitor: &mut dyn Visitor<'kvs>) -> Result<(), Error> {
Source::visit(&**self, visitor)
}
fn get<'v>(&'v self, key: Key) -> Option<Value<'v>> {
Source::get(&**self, key)
}
fn count(&self) -> usize {
Source::count(&**self)
}
}
impl<'kvs, V> Visitor<'kvs> for Box<V>
where
V: Visitor<'kvs> + ?Sized,
{
fn visit_pair(&mut self, key: Key<'kvs>, value: Value<'kvs>) -> Result<(), Error> {
(**self).visit_pair(key, value)
}
}
impl<K, V, S> Source for HashMap<K, V, S>
where
K: ToKey + Borrow<str> + Eq + Hash,
V: ToValue,
S: BuildHasher,
{
fn visit<'kvs>(&'kvs self, visitor: &mut dyn Visitor<'kvs>) -> Result<(), Error> {
for (key, value) in self {
visitor.visit_pair(key.to_key(), value.to_value())?;
}
Ok(())
}
fn get<'v>(&'v self, key: Key) -> Option<Value<'v>> {
HashMap::get(self, key.as_str()).map(|v| v.to_value())
}
fn count(&self) -> usize {
self.len()
}
}
impl<K, V> Source for BTreeMap<K, V>
where
K: ToKey + Borrow<str> + Ord,
V: ToValue,
{
fn visit<'kvs>(&'kvs self, visitor: &mut dyn Visitor<'kvs>) -> Result<(), Error> {
for (key, value) in self {
visitor.visit_pair(key.to_key(), value.to_value())?;
}
Ok(())
}
fn get<'v>(&'v self, key: Key) -> Option<Value<'v>> {
BTreeMap::get(self, key.as_str()).map(|v| v.to_value())
}
fn count(&self) -> usize {
self.len()
}
}
#[cfg(test)]
mod tests {
use super::*;
use kv::value::tests::Token;
use std::collections::{BTreeMap, HashMap};
#[test]
fn count() {
assert_eq!(1, Source::count(&Box::new(("a", 1))));
assert_eq!(2, Source::count(&vec![("a", 1), ("b", 2)]));
}
#[test]
fn get() {
let source = vec![("a", 1), ("b", 2), ("a", 1)];
assert_eq!(
Token::I64(1),
Source::get(&source, Key::from_str("a")).unwrap().to_token()
);
let source = Box::new(Option::None::<(&str, i32)>);
assert!(Source::get(&source, Key::from_str("a")).is_none());
}
#[test]
fn hash_map() {
let mut map = HashMap::new();
map.insert("a", 1);
map.insert("b", 2);
assert_eq!(2, Source::count(&map));
assert_eq!(
Token::I64(1),
Source::get(&map, Key::from_str("a")).unwrap().to_token()
);
}
#[test]
fn btree_map() {
let mut map = BTreeMap::new();
map.insert("a", 1);
map.insert("b", 2);
assert_eq!(2, Source::count(&map));
assert_eq!(
Token::I64(1),
Source::get(&map, Key::from_str("a")).unwrap().to_token()
);
}
}
}
/// The result of calling `Source::as_map`.
pub struct AsMap<S>(S);
/// Visit this source as a map.
pub fn as_map<S>(source: S) -> AsMap<S>
where
S: Source,
{
AsMap(source)
}
impl<S> Source for AsMap<S>
where
S: Source,
{
fn visit<'kvs>(&'kvs self, visitor: &mut dyn Visitor<'kvs>) -> Result<(), Error> {
self.0.visit(visitor)
}
fn get<'v>(&'v self, key: Key) -> Option<Value<'v>> {
self.0.get(key)
}
fn count(&self) -> usize {
self.0.count()
}
}
impl<S> fmt::Debug for AsMap<S>
where
S: Source,
{
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let mut f = f.debug_map();
self.0.visit(&mut f).map_err(|_| fmt::Error)?;
f.finish()
}
}
/// The result of calling `Source::as_list`
pub struct AsList<S>(S);
/// Visit this source as a list.
pub fn as_list<S>(source: S) -> AsList<S>
where
S: Source,
{
AsList(source)
}
impl<S> Source for AsList<S>
where
S: Source,
{
fn visit<'kvs>(&'kvs self, visitor: &mut dyn Visitor<'kvs>) -> Result<(), Error> {
self.0.visit(visitor)
}
fn get<'v>(&'v self, key: Key) -> Option<Value<'v>> {
self.0.get(key)
}
fn count(&self) -> usize {
self.0.count()
}
}
impl<S> fmt::Debug for AsList<S>
where
S: Source,
{
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let mut f = f.debug_list();
self.0.visit(&mut f).map_err(|_| fmt::Error)?;
f.finish()
}
}
#[cfg(feature = "kv_unstable_sval")]
mod sval_support {
use super::*;
impl<S> self::sval::Value for AsMap<S>
where
S: Source,
{
fn stream<'sval, SV: self::sval::Stream<'sval> + ?Sized>(
&'sval self,
stream: &mut SV,
) -> self::sval::Result {
struct StreamVisitor<'a, V: ?Sized>(&'a mut V);
impl<'a, 'kvs, V: self::sval::Stream<'kvs> + ?Sized> Visitor<'kvs> for StreamVisitor<'a, V> {
fn visit_pair(&mut self, key: Key<'kvs>, value: Value<'kvs>) -> Result<(), Error> {
self.0
.map_key_begin()
.map_err(|_| Error::msg("failed to stream map key"))?;
sval_ref::stream_ref(self.0, key)
.map_err(|_| Error::msg("failed to stream map key"))?;
self.0
.map_key_end()
.map_err(|_| Error::msg("failed to stream map key"))?;
self.0
.map_value_begin()
.map_err(|_| Error::msg("failed to stream map value"))?;
sval_ref::stream_ref(self.0, value)
.map_err(|_| Error::msg("failed to stream map value"))?;
self.0
.map_value_end()
.map_err(|_| Error::msg("failed to stream map value"))?;
Ok(())
}
}
stream
.map_begin(Some(self.count()))
.map_err(|_| self::sval::Error::new())?;
self.visit(&mut StreamVisitor(stream))
.map_err(|_| self::sval::Error::new())?;
stream.map_end().map_err(|_| self::sval::Error::new())
}
}
impl<S> self::sval::Value for AsList<S>
where
S: Source,
{
fn stream<'sval, SV: self::sval::Stream<'sval> + ?Sized>(
&'sval self,
stream: &mut SV,
) -> self::sval::Result {
struct StreamVisitor<'a, V: ?Sized>(&'a mut V);
impl<'a, 'kvs, V: self::sval::Stream<'kvs> + ?Sized> Visitor<'kvs> for StreamVisitor<'a, V> {
fn visit_pair(&mut self, key: Key<'kvs>, value: Value<'kvs>) -> Result<(), Error> {
self.0
.seq_value_begin()
.map_err(|_| Error::msg("failed to stream seq value"))?;
self::sval_ref::stream_ref(self.0, (key, value))
.map_err(|_| Error::msg("failed to stream seq value"))?;
self.0
.seq_value_end()
.map_err(|_| Error::msg("failed to stream seq value"))?;
Ok(())
}
}
stream
.seq_begin(Some(self.count()))
.map_err(|_| self::sval::Error::new())?;
self.visit(&mut StreamVisitor(stream))
.map_err(|_| self::sval::Error::new())?;
stream.seq_end().map_err(|_| self::sval::Error::new())
}
}
#[cfg(test)]
mod tests {
extern crate sval_derive;
use super::*;
use self::sval_derive::Value;
use crate::kv::source;
#[test]
fn derive_stream() {
#[derive(Value)]
pub struct MyRecordAsMap<'a> {
msg: &'a str,
kvs: source::AsMap<&'a dyn Source>,
}
#[derive(Value)]
pub struct MyRecordAsList<'a> {
msg: &'a str,
kvs: source::AsList<&'a dyn Source>,
}
}
}
}
#[cfg(feature = "kv_unstable_serde")]
pub mod as_map {
//! `serde` adapters for serializing a `Source` as a map.
use super::*;
use self::serde::{Serialize, Serializer};
/// Serialize a `Source` as a map.
pub fn serialize<T, S>(source: &T, serializer: S) -> Result<S::Ok, S::Error>
where
T: Source,
S: Serializer,
{
as_map(source).serialize(serializer)
}
}
#[cfg(feature = "kv_unstable_serde")]
pub mod as_list {
//! `serde` adapters for serializing a `Source` as a list.
use super::*;
use self::serde::{Serialize, Serializer};
/// Serialize a `Source` as a list.
pub fn serialize<T, S>(source: &T, serializer: S) -> Result<S::Ok, S::Error>
where
T: Source,
S: Serializer,
{
as_list(source).serialize(serializer)
}
}
#[cfg(feature = "kv_unstable_serde")]
mod serde_support {
use super::*;
use self::serde::ser::{Error as SerError, Serialize, SerializeMap, SerializeSeq, Serializer};
impl<T> Serialize for AsMap<T>
where
T: Source,
{
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
struct SerializerVisitor<'a, S>(&'a mut S);
impl<'a, 'kvs, S> Visitor<'kvs> for SerializerVisitor<'a, S>
where
S: SerializeMap,
{
fn visit_pair(&mut self, key: Key<'kvs>, value: Value<'kvs>) -> Result<(), Error> {
self.0
.serialize_entry(&key, &value)
.map_err(|_| Error::msg("failed to serialize map entry"))?;
Ok(())
}
}
let mut map = serializer.serialize_map(Some(self.count()))?;
self.visit(&mut SerializerVisitor(&mut map))
.map_err(|_| S::Error::custom("failed to visit key-values"))?;
map.end()
}
}
impl<T> Serialize for AsList<T>
where
T: Source,
{
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
struct SerializerVisitor<'a, S>(&'a mut S);
impl<'a, 'kvs, S> Visitor<'kvs> for SerializerVisitor<'a, S>
where
S: SerializeSeq,
{
fn visit_pair(&mut self, key: Key<'kvs>, value: Value<'kvs>) -> Result<(), Error> {
self.0
.serialize_element(&(key, value))
.map_err(|_| Error::msg("failed to serialize seq entry"))?;
Ok(())
}
}
let mut seq = serializer.serialize_seq(Some(self.count()))?;
self.visit(&mut SerializerVisitor(&mut seq))
.map_err(|_| S::Error::custom("failed to visit seq"))?;
seq.end()
}
}
#[cfg(test)]
mod tests {
use super::*;
use self::serde::Serialize;
use crate::kv::source;
#[test]
fn derive_serialize() {
#[derive(Serialize)]
pub struct MyRecordAsMap<'a> {
msg: &'a str,
#[serde(flatten)]
#[serde(with = "source::as_map")]
kvs: &'a dyn Source,
}
#[derive(Serialize)]
pub struct MyRecordAsList<'a> {
msg: &'a str,
#[serde(flatten)]
#[serde(with = "source::as_list")]
kvs: &'a dyn Source,
}
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use kv::value::tests::Token;
#[test]
fn source_is_object_safe() {
fn _check(_: &dyn Source) {}
}
#[test]
fn visitor_is_object_safe() {
fn _check(_: &dyn Visitor) {}
}
#[test]
fn count() {
struct OnePair {
key: &'static str,
value: i32,
}
impl Source for OnePair {
fn visit<'kvs>(&'kvs self, visitor: &mut dyn Visitor<'kvs>) -> Result<(), Error> {
visitor.visit_pair(self.key.to_key(), self.value.to_value())
}
fn get<'v>(&'v self, key: Key) -> Option<Value<'v>> {
get_default(self, key)
}
fn count(&self) -> usize {
count_default(self)
}
}
assert_eq!(1, Source::count(&("a", 1)));
assert_eq!(2, Source::count(&[("a", 1), ("b", 2)] as &[_]));
assert_eq!(0, Source::count(&Option::None::<(&str, i32)>));
assert_eq!(1, Source::count(&OnePair { key: "a", value: 1 }));
}
#[test]
fn get() {
let source = &[("a", 1), ("b", 2), ("a", 1)] as &[_];
assert_eq!(
Token::I64(1),
Source::get(source, Key::from_str("a")).unwrap().to_token()
);
assert_eq!(
Token::I64(2),
Source::get(source, Key::from_str("b")).unwrap().to_token()
);
assert!(Source::get(&source, Key::from_str("c")).is_none());
let source = Option::None::<(&str, i32)>;
assert!(Source::get(&source, Key::from_str("a")).is_none());
}
#[test]
fn as_map() {
let _ = crate::kv::source::as_map(("a", 1));
let _ = crate::kv::source::as_map(&("a", 1) as &dyn Source);
}
#[test]
fn as_list() {
let _ = crate::kv::source::as_list(("a", 1));
let _ = crate::kv::source::as_list(&("a", 1) as &dyn Source);
}
}

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// Copyright 2014-2015 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
/// The standard logging macro.
///
/// This macro will generically log with the specified `Level` and `format!`
/// based argument list.
///
/// # Examples
///
/// ```edition2018
/// use log::{log, Level};
///
/// # fn main() {
/// let data = (42, "Forty-two");
/// let private_data = "private";
///
/// log!(Level::Error, "Received errors: {}, {}", data.0, data.1);
/// log!(target: "app_events", Level::Warn, "App warning: {}, {}, {}",
/// data.0, data.1, private_data);
/// # }
/// ```
#[macro_export]
macro_rules! log {
// log!(target: "my_target", Level::Info, key1 = 42, key2 = true; "a {} event", "log");
(target: $target:expr, $lvl:expr, $($key:tt = $value:expr),+; $($arg:tt)+) => ({
let lvl = $lvl;
if lvl <= $crate::STATIC_MAX_LEVEL && lvl <= $crate::max_level() {
$crate::__private_api::log(
$crate::__private_api::format_args!($($arg)+),
lvl,
&($target, $crate::__private_api::module_path!(), $crate::__private_api::file!()),
$crate::__private_api::line!(),
$crate::__private_api::Option::Some(&[$(($crate::__log_key!($key), &$value)),+])
);
}
});
// log!(target: "my_target", Level::Info, "a {} event", "log");
(target: $target:expr, $lvl:expr, $($arg:tt)+) => ({
let lvl = $lvl;
if lvl <= $crate::STATIC_MAX_LEVEL && lvl <= $crate::max_level() {
$crate::__private_api::log(
$crate::__private_api::format_args!($($arg)+),
lvl,
&($target, $crate::__private_api::module_path!(), $crate::__private_api::file!()),
$crate::__private_api::line!(),
$crate::__private_api::Option::None,
);
}
});
// log!(Level::Info, "a log event")
($lvl:expr, $($arg:tt)+) => ($crate::log!(target: $crate::__private_api::module_path!(), $lvl, $($arg)+));
}
/// Logs a message at the error level.
///
/// # Examples
///
/// ```edition2018
/// use log::error;
///
/// # fn main() {
/// let (err_info, port) = ("No connection", 22);
///
/// error!("Error: {} on port {}", err_info, port);
/// error!(target: "app_events", "App Error: {}, Port: {}", err_info, 22);
/// # }
/// ```
#[macro_export]
macro_rules! error {
// error!(target: "my_target", key1 = 42, key2 = true; "a {} event", "log")
// error!(target: "my_target", "a {} event", "log")
(target: $target:expr, $($arg:tt)+) => ($crate::log!(target: $target, $crate::Level::Error, $($arg)+));
// error!("a {} event", "log")
($($arg:tt)+) => ($crate::log!($crate::Level::Error, $($arg)+))
}
/// Logs a message at the warn level.
///
/// # Examples
///
/// ```edition2018
/// use log::warn;
///
/// # fn main() {
/// let warn_description = "Invalid Input";
///
/// warn!("Warning! {}!", warn_description);
/// warn!(target: "input_events", "App received warning: {}", warn_description);
/// # }
/// ```
#[macro_export]
macro_rules! warn {
// warn!(target: "my_target", key1 = 42, key2 = true; "a {} event", "log")
// warn!(target: "my_target", "a {} event", "log")
(target: $target:expr, $($arg:tt)+) => ($crate::log!(target: $target, $crate::Level::Warn, $($arg)+));
// warn!("a {} event", "log")
($($arg:tt)+) => ($crate::log!($crate::Level::Warn, $($arg)+))
}
/// Logs a message at the info level.
///
/// # Examples
///
/// ```edition2018
/// use log::info;
///
/// # fn main() {
/// # struct Connection { port: u32, speed: f32 }
/// let conn_info = Connection { port: 40, speed: 3.20 };
///
/// info!("Connected to port {} at {} Mb/s", conn_info.port, conn_info.speed);
/// info!(target: "connection_events", "Successful connection, port: {}, speed: {}",
/// conn_info.port, conn_info.speed);
/// # }
/// ```
#[macro_export]
macro_rules! info {
// info!(target: "my_target", key1 = 42, key2 = true; "a {} event", "log")
// info!(target: "my_target", "a {} event", "log")
(target: $target:expr, $($arg:tt)+) => ($crate::log!(target: $target, $crate::Level::Info, $($arg)+));
// info!("a {} event", "log")
($($arg:tt)+) => ($crate::log!($crate::Level::Info, $($arg)+))
}
/// Logs a message at the debug level.
///
/// # Examples
///
/// ```edition2018
/// use log::debug;
///
/// # fn main() {
/// # struct Position { x: f32, y: f32 }
/// let pos = Position { x: 3.234, y: -1.223 };
///
/// debug!("New position: x: {}, y: {}", pos.x, pos.y);
/// debug!(target: "app_events", "New position: x: {}, y: {}", pos.x, pos.y);
/// # }
/// ```
#[macro_export]
macro_rules! debug {
// debug!(target: "my_target", key1 = 42, key2 = true; "a {} event", "log")
// debug!(target: "my_target", "a {} event", "log")
(target: $target:expr, $($arg:tt)+) => ($crate::log!(target: $target, $crate::Level::Debug, $($arg)+));
// debug!("a {} event", "log")
($($arg:tt)+) => ($crate::log!($crate::Level::Debug, $($arg)+))
}
/// Logs a message at the trace level.
///
/// # Examples
///
/// ```edition2018
/// use log::trace;
///
/// # fn main() {
/// # struct Position { x: f32, y: f32 }
/// let pos = Position { x: 3.234, y: -1.223 };
///
/// trace!("Position is: x: {}, y: {}", pos.x, pos.y);
/// trace!(target: "app_events", "x is {} and y is {}",
/// if pos.x >= 0.0 { "positive" } else { "negative" },
/// if pos.y >= 0.0 { "positive" } else { "negative" });
/// # }
/// ```
#[macro_export]
macro_rules! trace {
// trace!(target: "my_target", key1 = 42, key2 = true; "a {} event", "log")
// trace!(target: "my_target", "a {} event", "log")
(target: $target:expr, $($arg:tt)+) => ($crate::log!(target: $target, $crate::Level::Trace, $($arg)+));
// trace!("a {} event", "log")
($($arg:tt)+) => ($crate::log!($crate::Level::Trace, $($arg)+))
}
/// Determines if a message logged at the specified level in that module will
/// be logged.
///
/// This can be used to avoid expensive computation of log message arguments if
/// the message would be ignored anyway.
///
/// # Examples
///
/// ```edition2018
/// use log::Level::Debug;
/// use log::{debug, log_enabled};
///
/// # fn foo() {
/// if log_enabled!(Debug) {
/// let data = expensive_call();
/// debug!("expensive debug data: {} {}", data.x, data.y);
/// }
/// if log_enabled!(target: "Global", Debug) {
/// let data = expensive_call();
/// debug!(target: "Global", "expensive debug data: {} {}", data.x, data.y);
/// }
/// # }
/// # struct Data { x: u32, y: u32 }
/// # fn expensive_call() -> Data { Data { x: 0, y: 0 } }
/// # fn main() {}
/// ```
#[macro_export]
macro_rules! log_enabled {
(target: $target:expr, $lvl:expr) => {{
let lvl = $lvl;
lvl <= $crate::STATIC_MAX_LEVEL
&& lvl <= $crate::max_level()
&& $crate::__private_api::enabled(lvl, $target)
}};
($lvl:expr) => {
$crate::log_enabled!(target: $crate::__private_api::module_path!(), $lvl)
};
}
#[doc(hidden)]
#[macro_export]
macro_rules! __log_key {
// key1 = 42
($($args:ident)*) => {
$crate::__private_api::stringify!($($args)*)
};
// "key1" = 42
($($args:expr)*) => {
$($args)*
};
}

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#![cfg(feature = "serde")]
extern crate serde;
use self::serde::de::{
Deserialize, DeserializeSeed, Deserializer, EnumAccess, Error, Unexpected, VariantAccess,
Visitor,
};
use self::serde::ser::{Serialize, Serializer};
use {Level, LevelFilter, LOG_LEVEL_NAMES};
use std::fmt;
use std::str::{self, FromStr};
// The Deserialize impls are handwritten to be case insensitive using FromStr.
impl Serialize for Level {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
match *self {
Level::Error => serializer.serialize_unit_variant("Level", 0, "ERROR"),
Level::Warn => serializer.serialize_unit_variant("Level", 1, "WARN"),
Level::Info => serializer.serialize_unit_variant("Level", 2, "INFO"),
Level::Debug => serializer.serialize_unit_variant("Level", 3, "DEBUG"),
Level::Trace => serializer.serialize_unit_variant("Level", 4, "TRACE"),
}
}
}
impl<'de> Deserialize<'de> for Level {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
struct LevelIdentifier;
impl<'de> Visitor<'de> for LevelIdentifier {
type Value = Level;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("log level")
}
fn visit_str<E>(self, s: &str) -> Result<Self::Value, E>
where
E: Error,
{
// Case insensitive.
FromStr::from_str(s).map_err(|_| Error::unknown_variant(s, &LOG_LEVEL_NAMES[1..]))
}
fn visit_bytes<E>(self, value: &[u8]) -> Result<Self::Value, E>
where
E: Error,
{
let variant = str::from_utf8(value)
.map_err(|_| Error::invalid_value(Unexpected::Bytes(value), &self))?;
self.visit_str(variant)
}
fn visit_u64<E>(self, v: u64) -> Result<Self::Value, E>
where
E: Error,
{
let variant = LOG_LEVEL_NAMES[1..]
.get(v as usize)
.ok_or_else(|| Error::invalid_value(Unexpected::Unsigned(v), &self))?;
self.visit_str(variant)
}
}
impl<'de> DeserializeSeed<'de> for LevelIdentifier {
type Value = Level;
fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
where
D: Deserializer<'de>,
{
deserializer.deserialize_identifier(LevelIdentifier)
}
}
struct LevelEnum;
impl<'de> Visitor<'de> for LevelEnum {
type Value = Level;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("log level")
}
fn visit_enum<A>(self, value: A) -> Result<Self::Value, A::Error>
where
A: EnumAccess<'de>,
{
let (level, variant) = value.variant_seed(LevelIdentifier)?;
// Every variant is a unit variant.
variant.unit_variant()?;
Ok(level)
}
}
deserializer.deserialize_enum("Level", &LOG_LEVEL_NAMES[1..], LevelEnum)
}
}
impl Serialize for LevelFilter {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
match *self {
LevelFilter::Off => serializer.serialize_unit_variant("LevelFilter", 0, "OFF"),
LevelFilter::Error => serializer.serialize_unit_variant("LevelFilter", 1, "ERROR"),
LevelFilter::Warn => serializer.serialize_unit_variant("LevelFilter", 2, "WARN"),
LevelFilter::Info => serializer.serialize_unit_variant("LevelFilter", 3, "INFO"),
LevelFilter::Debug => serializer.serialize_unit_variant("LevelFilter", 4, "DEBUG"),
LevelFilter::Trace => serializer.serialize_unit_variant("LevelFilter", 5, "TRACE"),
}
}
}
impl<'de> Deserialize<'de> for LevelFilter {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
struct LevelFilterIdentifier;
impl<'de> Visitor<'de> for LevelFilterIdentifier {
type Value = LevelFilter;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("log level filter")
}
fn visit_str<E>(self, s: &str) -> Result<Self::Value, E>
where
E: Error,
{
// Case insensitive.
FromStr::from_str(s).map_err(|_| Error::unknown_variant(s, &LOG_LEVEL_NAMES))
}
fn visit_bytes<E>(self, value: &[u8]) -> Result<Self::Value, E>
where
E: Error,
{
let variant = str::from_utf8(value)
.map_err(|_| Error::invalid_value(Unexpected::Bytes(value), &self))?;
self.visit_str(variant)
}
fn visit_u64<E>(self, v: u64) -> Result<Self::Value, E>
where
E: Error,
{
let variant = LOG_LEVEL_NAMES
.get(v as usize)
.ok_or_else(|| Error::invalid_value(Unexpected::Unsigned(v), &self))?;
self.visit_str(variant)
}
}
impl<'de> DeserializeSeed<'de> for LevelFilterIdentifier {
type Value = LevelFilter;
fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
where
D: Deserializer<'de>,
{
deserializer.deserialize_identifier(LevelFilterIdentifier)
}
}
struct LevelFilterEnum;
impl<'de> Visitor<'de> for LevelFilterEnum {
type Value = LevelFilter;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("log level filter")
}
fn visit_enum<A>(self, value: A) -> Result<Self::Value, A::Error>
where
A: EnumAccess<'de>,
{
let (level_filter, variant) = value.variant_seed(LevelFilterIdentifier)?;
// Every variant is a unit variant.
variant.unit_variant()?;
Ok(level_filter)
}
}
deserializer.deserialize_enum("LevelFilter", &LOG_LEVEL_NAMES, LevelFilterEnum)
}
}
#[cfg(test)]
mod tests {
extern crate serde_test;
use self::serde_test::{assert_de_tokens, assert_de_tokens_error, assert_tokens, Token};
use {Level, LevelFilter};
fn level_token(variant: &'static str) -> Token {
Token::UnitVariant {
name: "Level",
variant: variant,
}
}
fn level_bytes_tokens(variant: &'static [u8]) -> [Token; 3] {
[
Token::Enum { name: "Level" },
Token::Bytes(variant),
Token::Unit,
]
}
fn level_variant_tokens(variant: u32) -> [Token; 3] {
[
Token::Enum { name: "Level" },
Token::U32(variant),
Token::Unit,
]
}
fn level_filter_token(variant: &'static str) -> Token {
Token::UnitVariant {
name: "LevelFilter",
variant: variant,
}
}
fn level_filter_bytes_tokens(variant: &'static [u8]) -> [Token; 3] {
[
Token::Enum {
name: "LevelFilter",
},
Token::Bytes(variant),
Token::Unit,
]
}
fn level_filter_variant_tokens(variant: u32) -> [Token; 3] {
[
Token::Enum {
name: "LevelFilter",
},
Token::U32(variant),
Token::Unit,
]
}
#[test]
fn test_level_ser_de() {
let cases = [
(Level::Error, [level_token("ERROR")]),
(Level::Warn, [level_token("WARN")]),
(Level::Info, [level_token("INFO")]),
(Level::Debug, [level_token("DEBUG")]),
(Level::Trace, [level_token("TRACE")]),
];
for &(s, expected) in &cases {
assert_tokens(&s, &expected);
}
}
#[test]
fn test_level_case_insensitive() {
let cases = [
(Level::Error, [level_token("error")]),
(Level::Warn, [level_token("warn")]),
(Level::Info, [level_token("info")]),
(Level::Debug, [level_token("debug")]),
(Level::Trace, [level_token("trace")]),
];
for &(s, expected) in &cases {
assert_de_tokens(&s, &expected);
}
}
#[test]
fn test_level_de_bytes() {
let cases = [
(Level::Error, level_bytes_tokens(b"ERROR")),
(Level::Warn, level_bytes_tokens(b"WARN")),
(Level::Info, level_bytes_tokens(b"INFO")),
(Level::Debug, level_bytes_tokens(b"DEBUG")),
(Level::Trace, level_bytes_tokens(b"TRACE")),
];
for &(value, tokens) in &cases {
assert_de_tokens(&value, &tokens);
}
}
#[test]
fn test_level_de_variant_index() {
let cases = [
(Level::Error, level_variant_tokens(0)),
(Level::Warn, level_variant_tokens(1)),
(Level::Info, level_variant_tokens(2)),
(Level::Debug, level_variant_tokens(3)),
(Level::Trace, level_variant_tokens(4)),
];
for &(value, tokens) in &cases {
assert_de_tokens(&value, &tokens);
}
}
#[test]
fn test_level_de_error() {
let msg = "unknown variant `errorx`, expected one of \
`ERROR`, `WARN`, `INFO`, `DEBUG`, `TRACE`";
assert_de_tokens_error::<Level>(&[level_token("errorx")], msg);
}
#[test]
fn test_level_filter_ser_de() {
let cases = [
(LevelFilter::Off, [level_filter_token("OFF")]),
(LevelFilter::Error, [level_filter_token("ERROR")]),
(LevelFilter::Warn, [level_filter_token("WARN")]),
(LevelFilter::Info, [level_filter_token("INFO")]),
(LevelFilter::Debug, [level_filter_token("DEBUG")]),
(LevelFilter::Trace, [level_filter_token("TRACE")]),
];
for &(s, expected) in &cases {
assert_tokens(&s, &expected);
}
}
#[test]
fn test_level_filter_case_insensitive() {
let cases = [
(LevelFilter::Off, [level_filter_token("off")]),
(LevelFilter::Error, [level_filter_token("error")]),
(LevelFilter::Warn, [level_filter_token("warn")]),
(LevelFilter::Info, [level_filter_token("info")]),
(LevelFilter::Debug, [level_filter_token("debug")]),
(LevelFilter::Trace, [level_filter_token("trace")]),
];
for &(s, expected) in &cases {
assert_de_tokens(&s, &expected);
}
}
#[test]
fn test_level_filter_de_bytes() {
let cases = [
(LevelFilter::Off, level_filter_bytes_tokens(b"OFF")),
(LevelFilter::Error, level_filter_bytes_tokens(b"ERROR")),
(LevelFilter::Warn, level_filter_bytes_tokens(b"WARN")),
(LevelFilter::Info, level_filter_bytes_tokens(b"INFO")),
(LevelFilter::Debug, level_filter_bytes_tokens(b"DEBUG")),
(LevelFilter::Trace, level_filter_bytes_tokens(b"TRACE")),
];
for &(value, tokens) in &cases {
assert_de_tokens(&value, &tokens);
}
}
#[test]
fn test_level_filter_de_variant_index() {
let cases = [
(LevelFilter::Off, level_filter_variant_tokens(0)),
(LevelFilter::Error, level_filter_variant_tokens(1)),
(LevelFilter::Warn, level_filter_variant_tokens(2)),
(LevelFilter::Info, level_filter_variant_tokens(3)),
(LevelFilter::Debug, level_filter_variant_tokens(4)),
(LevelFilter::Trace, level_filter_variant_tokens(5)),
];
for &(value, tokens) in &cases {
assert_de_tokens(&value, &tokens);
}
}
#[test]
fn test_level_filter_de_error() {
let msg = "unknown variant `errorx`, expected one of \
`OFF`, `ERROR`, `WARN`, `INFO`, `DEBUG`, `TRACE`";
assert_de_tokens_error::<LevelFilter>(&[level_filter_token("errorx")], msg);
}
}

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