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<section id='main' class="content source"><pre class="line-numbers"><span id="1"> 1</span>
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</pre><pre class='rust '>
<span class='comment'>// Copyright 2015 The Rust Project Developers. See the COPYRIGHT</span>
<span class='comment'>// file at the top-level directory of this distribution and at</span>
<span class='comment'>// http://rust-lang.org/COPYRIGHT.</span>
<span class='comment'>//</span>
<span class='comment'>// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span>
<span class='comment'>// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span>
<span class='comment'>// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span>
<span class='comment'>// option. This file may not be copied, modified, or distributed</span>
<span class='comment'>// except according to those terms.</span>
<span class='doccomment'>//! A lightweight logging facade.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! A logging facade provides a single logging API that abstracts over the</span>
<span class='doccomment'>//! actual logging implementation. Libraries can use the logging API provided</span>
<span class='doccomment'>//! by this crate, and the consumer of those libraries can choose the logging</span>
<span class='doccomment'>//! framework that is most suitable for its use case.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! If no logging implementation is selected, the facade falls back to a "noop"</span>
<span class='doccomment'>//! implementation that ignores all log messages. The overhead in this case</span>
<span class='doccomment'>//! is very small - just an integer load, comparison and jump.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! A log request consists of a target, a level, and a body. A target is a</span>
<span class='doccomment'>//! string which defaults to the module path of the location of the log</span>
<span class='doccomment'>//! request, though that default may be overridden. Logger implementations</span>
<span class='doccomment'>//! typically use the target to filter requests based on some user</span>
<span class='doccomment'>//! configuration.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! # Use</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! ## In libraries</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! Libraries should link only to the `log` crate, and use the provided</span>
<span class='doccomment'>//! macros to log whatever information will be useful to downstream consumers.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! ### Examples</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! ```rust</span>
<span class='doccomment'>//! # #![allow(unstable)]</span>
<span class='doccomment'>//! #[macro_use]</span>
<span class='doccomment'>//! extern crate log;</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! # #[derive(Debug)] pub struct Yak(String);</span>
<span class='doccomment'>//! # impl Yak { fn shave(&self, _: u32) {} }</span>
<span class='doccomment'>//! # fn find_a_razor() -> Result<u32, u32> { Ok(1) }</span>
<span class='doccomment'>//! pub fn shave_the_yak(yak: &Yak) {</span>
<span class='doccomment'>//! info!(target: "yak_events", "Commencing yak shaving for {:?}", yak);</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! loop {</span>
<span class='doccomment'>//! match find_a_razor() {</span>
<span class='doccomment'>//! Ok(razor) => {</span>
<span class='doccomment'>//! info!("Razor located: {}", razor);</span>
<span class='doccomment'>//! yak.shave(razor);</span>
<span class='doccomment'>//! break;</span>
<span class='doccomment'>//! }</span>
<span class='doccomment'>//! Err(err) => {</span>
<span class='doccomment'>//! warn!("Unable to locate a razor: {}, retrying", err);</span>
<span class='doccomment'>//! }</span>
<span class='doccomment'>//! }</span>
<span class='doccomment'>//! }</span>
<span class='doccomment'>//! }</span>
<span class='doccomment'>//! # fn main() {}</span>
<span class='doccomment'>//! ```</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! ## In executables</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! Executables should chose a logging framework and initialize it early in the</span>
<span class='doccomment'>//! runtime of the program. Logging frameworks will typically include a</span>
<span class='doccomment'>//! function to do this. Any log messages generated before the framework is</span>
<span class='doccomment'>//! initialized will be ignored.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! The executable itself may use the `log` crate to log as well.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! ### Warning</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! The logging system may only be initialized once.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! ### Examples</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! ```rust,ignore</span>
<span class='doccomment'>//! #[macro_use]</span>
<span class='doccomment'>//! extern crate log;</span>
<span class='doccomment'>//! extern crate my_logger;</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! fn main() {</span>
<span class='doccomment'>//! my_logger::init();</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! info!("starting up");</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! // ...</span>
<span class='doccomment'>//! }</span>
<span class='doccomment'>//! ```</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! # Logger implementations</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! Loggers implement the `Log` trait. Here's a very basic example that simply</span>
<span class='doccomment'>//! logs all messages at the `Error`, `Warn` or `Info` levels to stdout:</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! ```rust</span>
<span class='doccomment'>//! extern crate log;</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! use log::{LogRecord, LogLevel, LogMetadata};</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! struct SimpleLogger;</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! impl log::Log for SimpleLogger {</span>
<span class='doccomment'>//! fn enabled(&self, metadata: &LogMetadata) -> bool {</span>
<span class='doccomment'>//! metadata.level() <= LogLevel::Info</span>
<span class='doccomment'>//! }</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! fn log(&self, record: &LogRecord) {</span>
<span class='doccomment'>//! if self.enabled(record.metadata()) {</span>
<span class='doccomment'>//! println!("{} - {}", record.level(), record.args());</span>
<span class='doccomment'>//! }</span>
<span class='doccomment'>//! }</span>
<span class='doccomment'>//! }</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! # fn main() {}</span>
<span class='doccomment'>//! ```</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! Loggers are installed by calling the `set_logger` function. It takes a</span>
<span class='doccomment'>//! closure which is provided a `MaxLogLevel` token and returns a `Log` trait</span>
<span class='doccomment'>//! object. The `MaxLogLevel` token controls the global maximum log level. The</span>
<span class='doccomment'>//! logging facade uses this as an optimization to improve performance of log</span>
<span class='doccomment'>//! messages at levels that are disabled. In the case of our example logger,</span>
<span class='doccomment'>//! we'll want to set the maximum log level to `Info`, since we ignore any</span>
<span class='doccomment'>//! `Debug` or `Trace` level log messages. A logging framework should provide a</span>
<span class='doccomment'>//! function that wraps a call to `set_logger`, handling initialization of the</span>
<span class='doccomment'>//! logger:</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! ```rust</span>
<span class='doccomment'>//! # extern crate log;</span>
<span class='doccomment'>//! # use log::{LogLevel, LogLevelFilter, SetLoggerError, LogMetadata};</span>
<span class='doccomment'>//! # struct SimpleLogger;</span>
<span class='doccomment'>//! # impl log::Log for SimpleLogger {</span>
<span class='doccomment'>//! # fn enabled(&self, _: &LogMetadata) -> bool { false }</span>
<span class='doccomment'>//! # fn log(&self, _: &log::LogRecord) {}</span>
<span class='doccomment'>//! # }</span>
<span class='doccomment'>//! # fn main() {}</span>
<span class='doccomment'>//! pub fn init() -> Result<(), SetLoggerError> {</span>
<span class='doccomment'>//! log::set_logger(|max_log_level| {</span>
<span class='doccomment'>//! max_log_level.set(LogLevelFilter::Info);</span>
<span class='doccomment'>//! Box::new(SimpleLogger)</span>
<span class='doccomment'>//! })</span>
<span class='doccomment'>//! }</span>
<span class='doccomment'>//! ```</span>
<span class='attribute'>#<span class='op'>!</span>[<span class='ident'>doc</span>(<span class='ident'>html_logo_url</span> <span class='op'>=</span> <span class='string'>"http://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png"</span>,
<span class='ident'>html_favicon_url</span> <span class='op'>=</span> <span class='string'>"http://www.rust-lang.org/favicon.ico"</span>,
<span class='ident'>html_root_url</span> <span class='op'>=</span> <span class='string'>"http://doc.rust-lang.org/log/"</span>)]</span>
<span class='attribute'>#<span class='op'>!</span>[<span class='ident'>warn</span>(<span class='ident'>missing_docs</span>)]</span>
<span class='kw'>extern</span> <span class='kw'>crate</span> <span class='ident'>libc</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>ascii</span>::<span class='ident'>AsciiExt</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>cmp</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>error</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>fmt</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>mem</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>ops</span>::<span class='ident'>Deref</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>str</span>::<span class='ident'>FromStr</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>sync</span>::<span class='ident'>atomic</span>::{<span class='ident'>AtomicUsize</span>, <span class='ident'>ATOMIC_USIZE_INIT</span>, <span class='ident'>Ordering</span>};
<span class='kw'>mod</span> <span class='ident'>macros</span>;
<span class='comment'>// The setup here is a bit weird to make at_exit work.</span>
<span class='comment'>//</span>
<span class='comment'>// There are four different states that we care about: the logger's</span>
<span class='comment'>// uninitialized, the logger's initializing (set_logger's been called but</span>
<span class='comment'>// LOGGER hasn't actually been set yet), the logger's active, or the logger's</span>
<span class='comment'>// shutting down inside of at_exit.</span>
<span class='comment'>//</span>
<span class='comment'>// The LOGGER static is normally a Box<Box<Log>> with some special possible</span>
<span class='comment'>// values as well. The uninitialized and initializing states are represented by</span>
<span class='comment'>// the values 0 and 1 respectively. The shutting down state is also represented</span>
<span class='comment'>// by 1. Any other value is a valid pointer to the logger.</span>
<span class='comment'>//</span>
<span class='comment'>// The at_exit routine needs to make sure that no threads are actively logging</span>
<span class='comment'>// when it deallocates the logger. The number of actively logging threads is</span>
<span class='comment'>// tracked in the REFCOUNT static. The routine first sets LOGGER back to 1.</span>
<span class='comment'>// All logging calls past that point will immediately return without accessing</span>
<span class='comment'>// the logger. At that point, the at_exit routine just waits for the refcount</span>
<span class='comment'>// to reach 0 before deallocating the logger. Note that the refcount does not</span>
<span class='comment'>// necessarily monotonically decrease at this point, as new log calls still</span>
<span class='comment'>// increment and decrement it, but the interval in between is small enough that</span>
<span class='comment'>// the wait is really just for the active log calls to finish.</span>
<span class='kw'>static</span> <span class='ident'>LOGGER</span>: <span class='ident'>AtomicUsize</span> <span class='op'>=</span> <span class='ident'>ATOMIC_USIZE_INIT</span>;
<span class='kw'>static</span> <span class='ident'>REFCOUNT</span>: <span class='ident'>AtomicUsize</span> <span class='op'>=</span> <span class='ident'>ATOMIC_USIZE_INIT</span>;
<span class='kw'>const</span> <span class='ident'>UNINITIALIZED</span>: <span class='ident'>usize</span> <span class='op'>=</span> <span class='number'>0</span>;
<span class='kw'>const</span> <span class='ident'>INITIALIZING</span>: <span class='ident'>usize</span> <span class='op'>=</span> <span class='number'>1</span>;
<span class='kw'>static</span> <span class='ident'>MAX_LOG_LEVEL_FILTER</span>: <span class='ident'>AtomicUsize</span> <span class='op'>=</span> <span class='ident'>ATOMIC_USIZE_INIT</span>;
<span class='kw'>static</span> <span class='ident'>LOG_LEVEL_NAMES</span>: [<span class='kw-2'>&</span><span class='lifetime'>'static</span> <span class='ident'>str</span>; <span class='number'>6</span>] <span class='op'>=</span> [<span class='string'>"OFF"</span>, <span class='string'>"ERROR"</span>, <span class='string'>"WARN"</span>, <span class='string'>"INFO"</span>,
<span class='string'>"DEBUG"</span>, <span class='string'>"TRACE"</span>];
<span class='doccomment'>/// An enum representing the available verbosity levels of the logging framework</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// A `LogLevel` may be compared directly to a `LogLevelFilter`.</span>
<span class='attribute'>#[<span class='ident'>repr</span>(<span class='ident'>usize</span>)]</span>
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Copy</span>, <span class='ident'>Eq</span>, <span class='ident'>Debug</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>enum</span> <span class='ident'>LogLevel</span> {
<span class='doccomment'>/// The "error" level.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// Designates very serious errors.</span>
<span class='ident'>Error</span> <span class='op'>=</span> <span class='number'>1</span>, <span class='comment'>// This way these line up with the discriminants for LogLevelFilter below</span>
<span class='doccomment'>/// The "warn" level.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// Designates hazardous situations.</span>
<span class='ident'>Warn</span>,
<span class='doccomment'>/// The "info" level.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// Designates useful information.</span>
<span class='ident'>Info</span>,
<span class='doccomment'>/// The "debug" level.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// Designates lower priority information.</span>
<span class='ident'>Debug</span>,
<span class='doccomment'>/// The "trace" level.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// Designates very low priority, often extremely verbose, information.</span>
<span class='ident'>Trace</span>,
}
<span class='kw'>impl</span> <span class='ident'>Clone</span> <span class='kw'>for</span> <span class='ident'>LogLevel</span> {
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>fn</span> <span class='ident'>clone</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>LogLevel</span> {
<span class='op'>*</span><span class='self'>self</span>
}
}
<span class='kw'>impl</span> <span class='ident'>PartialEq</span> <span class='kw'>for</span> <span class='ident'>LogLevel</span> {
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>fn</span> <span class='ident'>eq</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>other</span>: <span class='kw-2'>&</span><span class='ident'>LogLevel</span>) <span class='op'>-></span> <span class='ident'>bool</span> {
<span class='op'>*</span><span class='self'>self</span> <span class='kw'>as</span> <span class='ident'>usize</span> <span class='op'>==</span> <span class='op'>*</span><span class='ident'>other</span> <span class='kw'>as</span> <span class='ident'>usize</span>
}
}
<span class='kw'>impl</span> <span class='ident'>PartialEq</span><span class='op'><</span><span class='ident'>LogLevelFilter</span><span class='op'>></span> <span class='kw'>for</span> <span class='ident'>LogLevel</span> {
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>fn</span> <span class='ident'>eq</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>other</span>: <span class='kw-2'>&</span><span class='ident'>LogLevelFilter</span>) <span class='op'>-></span> <span class='ident'>bool</span> {
<span class='op'>*</span><span class='self'>self</span> <span class='kw'>as</span> <span class='ident'>usize</span> <span class='op'>==</span> <span class='op'>*</span><span class='ident'>other</span> <span class='kw'>as</span> <span class='ident'>usize</span>
}
}
<span class='kw'>impl</span> <span class='ident'>PartialOrd</span> <span class='kw'>for</span> <span class='ident'>LogLevel</span> {
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>fn</span> <span class='ident'>partial_cmp</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>other</span>: <span class='kw-2'>&</span><span class='ident'>LogLevel</span>) <span class='op'>-></span> <span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>cmp</span>::<span class='ident'>Ordering</span><span class='op'>></span> {
<span class='prelude-val'>Some</span>(<span class='self'>self</span>.<span class='ident'>cmp</span>(<span class='ident'>other</span>))
}
}
<span class='kw'>impl</span> <span class='ident'>PartialOrd</span><span class='op'><</span><span class='ident'>LogLevelFilter</span><span class='op'>></span> <span class='kw'>for</span> <span class='ident'>LogLevel</span> {
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>fn</span> <span class='ident'>partial_cmp</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>other</span>: <span class='kw-2'>&</span><span class='ident'>LogLevelFilter</span>) <span class='op'>-></span> <span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>cmp</span>::<span class='ident'>Ordering</span><span class='op'>></span> {
<span class='prelude-val'>Some</span>((<span class='op'>*</span><span class='self'>self</span> <span class='kw'>as</span> <span class='ident'>usize</span>).<span class='ident'>cmp</span>(<span class='kw-2'>&</span>(<span class='op'>*</span><span class='ident'>other</span> <span class='kw'>as</span> <span class='ident'>usize</span>)))
}
}
<span class='kw'>impl</span> <span class='ident'>Ord</span> <span class='kw'>for</span> <span class='ident'>LogLevel</span> {
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>fn</span> <span class='ident'>cmp</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>other</span>: <span class='kw-2'>&</span><span class='ident'>LogLevel</span>) <span class='op'>-></span> <span class='ident'>cmp</span>::<span class='ident'>Ordering</span> {
(<span class='op'>*</span><span class='self'>self</span> <span class='kw'>as</span> <span class='ident'>usize</span>).<span class='ident'>cmp</span>(<span class='kw-2'>&</span>(<span class='op'>*</span><span class='ident'>other</span> <span class='kw'>as</span> <span class='ident'>usize</span>))
}
}
<span class='kw'>fn</span> <span class='ident'>ok_or</span><span class='op'><</span><span class='ident'>T</span>, <span class='ident'>E</span><span class='op'>></span>(<span class='ident'>t</span>: <span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>T</span><span class='op'>></span>, <span class='ident'>e</span>: <span class='ident'>E</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>T</span>, <span class='ident'>E</span><span class='op'>></span> {
<span class='kw'>match</span> <span class='ident'>t</span> {
<span class='prelude-val'>Some</span>(<span class='ident'>t</span>) <span class='op'>=></span> <span class='prelude-val'>Ok</span>(<span class='ident'>t</span>),
<span class='prelude-val'>None</span> <span class='op'>=></span> <span class='prelude-val'>Err</span>(<span class='ident'>e</span>),
}
}
<span class='kw'>impl</span> <span class='ident'>FromStr</span> <span class='kw'>for</span> <span class='ident'>LogLevel</span> {
<span class='kw'>type</span> <span class='prelude-val'>Err</span> <span class='op'>=</span> ();
<span class='kw'>fn</span> <span class='ident'>from_str</span>(<span class='ident'>level</span>: <span class='kw-2'>&</span><span class='ident'>str</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>LogLevel</span>, ()<span class='op'>></span> {
<span class='ident'>ok_or</span>(<span class='ident'>LOG_LEVEL_NAMES</span>.<span class='ident'>iter</span>()
.<span class='ident'>position</span>(<span class='op'>|</span><span class='kw-2'>&</span><span class='ident'>name</span><span class='op'>|</span> <span class='ident'>name</span>.<span class='ident'>eq_ignore_ascii_case</span>(<span class='ident'>level</span>))
.<span class='ident'>into_iter</span>()
.<span class='ident'>filter</span>(<span class='op'>|</span><span class='kw-2'>&</span><span class='ident'>idx</span><span class='op'>|</span> <span class='ident'>idx</span> <span class='op'>!=</span> <span class='number'>0</span>)
.<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>idx</span><span class='op'>|</span> <span class='ident'>LogLevel</span>::<span class='ident'>from_usize</span>(<span class='ident'>idx</span>).<span class='ident'>unwrap</span>())
.<span class='ident'>next</span>(), ())
}
}
<span class='kw'>impl</span> <span class='ident'>fmt</span>::<span class='ident'>Display</span> <span class='kw'>for</span> <span class='ident'>LogLevel</span> {
<span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>fmt</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-></span> <span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span> {
<span class='ident'>fmt</span>.<span class='ident'>pad</span>(<span class='ident'>LOG_LEVEL_NAMES</span>[<span class='op'>*</span><span class='self'>self</span> <span class='kw'>as</span> <span class='ident'>usize</span>])
}
}
<span class='kw'>impl</span> <span class='ident'>LogLevel</span> {
<span class='kw'>fn</span> <span class='ident'>from_usize</span>(<span class='ident'>u</span>: <span class='ident'>usize</span>) <span class='op'>-></span> <span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>LogLevel</span><span class='op'>></span> {
<span class='kw'>match</span> <span class='ident'>u</span> {
<span class='number'>1</span> <span class='op'>=></span> <span class='prelude-val'>Some</span>(<span class='ident'>LogLevel</span>::<span class='ident'>Error</span>),
<span class='number'>2</span> <span class='op'>=></span> <span class='prelude-val'>Some</span>(<span class='ident'>LogLevel</span>::<span class='ident'>Warn</span>),
<span class='number'>3</span> <span class='op'>=></span> <span class='prelude-val'>Some</span>(<span class='ident'>LogLevel</span>::<span class='ident'>Info</span>),
<span class='number'>4</span> <span class='op'>=></span> <span class='prelude-val'>Some</span>(<span class='ident'>LogLevel</span>::<span class='ident'>Debug</span>),
<span class='number'>5</span> <span class='op'>=></span> <span class='prelude-val'>Some</span>(<span class='ident'>LogLevel</span>::<span class='ident'>Trace</span>),
_ <span class='op'>=></span> <span class='prelude-val'>None</span>
}
}
<span class='doccomment'>/// Returns the most verbose logging level.</span>
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>max</span>() <span class='op'>-></span> <span class='ident'>LogLevel</span> {
<span class='ident'>LogLevel</span>::<span class='ident'>Trace</span>
}
<span class='doccomment'>/// Converts the `LogLevel` to the equivalent `LogLevelFilter`.</span>
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>to_log_level_filter</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>LogLevelFilter</span> {
<span class='ident'>LogLevelFilter</span>::<span class='ident'>from_usize</span>(<span class='op'>*</span><span class='self'>self</span> <span class='kw'>as</span> <span class='ident'>usize</span>).<span class='ident'>unwrap</span>()
}
}
<span class='doccomment'>/// An enum representing the available verbosity level filters of the logging</span>
<span class='doccomment'>/// framework.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// A `LogLevelFilter` may be compared directly to a `LogLevel`.</span>
<span class='attribute'>#[<span class='ident'>repr</span>(<span class='ident'>usize</span>)]</span>
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Copy</span>, <span class='ident'>Eq</span>, <span class='ident'>Debug</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>enum</span> <span class='ident'>LogLevelFilter</span> {
<span class='doccomment'>/// A level lower than all log levels.</span>
<span class='ident'>Off</span>,
<span class='doccomment'>/// Corresponds to the `Error` log level.</span>
<span class='ident'>Error</span>,
<span class='doccomment'>/// Corresponds to the `Warn` log level.</span>
<span class='ident'>Warn</span>,
<span class='doccomment'>/// Corresponds to the `Trace` log level.</span>
<span class='ident'>Info</span>,
<span class='doccomment'>/// Corresponds to the `Debug` log level.</span>
<span class='ident'>Debug</span>,
<span class='doccomment'>/// Corresponds to the `Trace` log level.</span>
<span class='ident'>Trace</span>,
}
<span class='comment'>// Deriving generates terrible impls of these traits</span>
<span class='kw'>impl</span> <span class='ident'>Clone</span> <span class='kw'>for</span> <span class='ident'>LogLevelFilter</span> {
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>fn</span> <span class='ident'>clone</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>LogLevelFilter</span> {
<span class='op'>*</span><span class='self'>self</span>
}
}
<span class='kw'>impl</span> <span class='ident'>PartialEq</span> <span class='kw'>for</span> <span class='ident'>LogLevelFilter</span> {
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>fn</span> <span class='ident'>eq</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>other</span>: <span class='kw-2'>&</span><span class='ident'>LogLevelFilter</span>) <span class='op'>-></span> <span class='ident'>bool</span> {
<span class='op'>*</span><span class='self'>self</span> <span class='kw'>as</span> <span class='ident'>usize</span> <span class='op'>==</span> <span class='op'>*</span><span class='ident'>other</span> <span class='kw'>as</span> <span class='ident'>usize</span>
}
}
<span class='kw'>impl</span> <span class='ident'>PartialEq</span><span class='op'><</span><span class='ident'>LogLevel</span><span class='op'>></span> <span class='kw'>for</span> <span class='ident'>LogLevelFilter</span> {
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>fn</span> <span class='ident'>eq</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>other</span>: <span class='kw-2'>&</span><span class='ident'>LogLevel</span>) <span class='op'>-></span> <span class='ident'>bool</span> {
<span class='ident'>other</span>.<span class='ident'>eq</span>(<span class='self'>self</span>)
}
}
<span class='kw'>impl</span> <span class='ident'>PartialOrd</span> <span class='kw'>for</span> <span class='ident'>LogLevelFilter</span> {
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>fn</span> <span class='ident'>partial_cmp</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>other</span>: <span class='kw-2'>&</span><span class='ident'>LogLevelFilter</span>) <span class='op'>-></span> <span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>cmp</span>::<span class='ident'>Ordering</span><span class='op'>></span> {
<span class='prelude-val'>Some</span>(<span class='self'>self</span>.<span class='ident'>cmp</span>(<span class='ident'>other</span>))
}
}
<span class='kw'>impl</span> <span class='ident'>PartialOrd</span><span class='op'><</span><span class='ident'>LogLevel</span><span class='op'>></span> <span class='kw'>for</span> <span class='ident'>LogLevelFilter</span> {
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>fn</span> <span class='ident'>partial_cmp</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>other</span>: <span class='kw-2'>&</span><span class='ident'>LogLevel</span>) <span class='op'>-></span> <span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>cmp</span>::<span class='ident'>Ordering</span><span class='op'>></span> {
<span class='ident'>other</span>.<span class='ident'>partial_cmp</span>(<span class='self'>self</span>).<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>x</span><span class='op'>|</span> <span class='ident'>x</span>.<span class='ident'>reverse</span>())
}
}
<span class='kw'>impl</span> <span class='ident'>Ord</span> <span class='kw'>for</span> <span class='ident'>LogLevelFilter</span> {
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>fn</span> <span class='ident'>cmp</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>other</span>: <span class='kw-2'>&</span><span class='ident'>LogLevelFilter</span>) <span class='op'>-></span> <span class='ident'>cmp</span>::<span class='ident'>Ordering</span> {
(<span class='op'>*</span><span class='self'>self</span> <span class='kw'>as</span> <span class='ident'>usize</span>).<span class='ident'>cmp</span>(<span class='kw-2'>&</span>(<span class='op'>*</span><span class='ident'>other</span> <span class='kw'>as</span> <span class='ident'>usize</span>))
}
}
<span class='kw'>impl</span> <span class='ident'>FromStr</span> <span class='kw'>for</span> <span class='ident'>LogLevelFilter</span> {
<span class='kw'>type</span> <span class='prelude-val'>Err</span> <span class='op'>=</span> ();
<span class='kw'>fn</span> <span class='ident'>from_str</span>(<span class='ident'>level</span>: <span class='kw-2'>&</span><span class='ident'>str</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>LogLevelFilter</span>, ()<span class='op'>></span> {
<span class='ident'>ok_or</span>(<span class='ident'>LOG_LEVEL_NAMES</span>.<span class='ident'>iter</span>()
.<span class='ident'>position</span>(<span class='op'>|</span><span class='kw-2'>&</span><span class='ident'>name</span><span class='op'>|</span> <span class='ident'>name</span>.<span class='ident'>eq_ignore_ascii_case</span>(<span class='ident'>level</span>))
.<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>p</span><span class='op'>|</span> <span class='ident'>LogLevelFilter</span>::<span class='ident'>from_usize</span>(<span class='ident'>p</span>).<span class='ident'>unwrap</span>()), ())
}
}
<span class='kw'>impl</span> <span class='ident'>fmt</span>::<span class='ident'>Display</span> <span class='kw'>for</span> <span class='ident'>LogLevelFilter</span> {
<span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>fmt</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-></span> <span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span> {
<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>fmt</span>, <span class='string'>"{}"</span>, <span class='ident'>LOG_LEVEL_NAMES</span>[<span class='op'>*</span><span class='self'>self</span> <span class='kw'>as</span> <span class='ident'>usize</span>])
}
}
<span class='kw'>impl</span> <span class='ident'>LogLevelFilter</span> {
<span class='kw'>fn</span> <span class='ident'>from_usize</span>(<span class='ident'>u</span>: <span class='ident'>usize</span>) <span class='op'>-></span> <span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>LogLevelFilter</span><span class='op'>></span> {
<span class='kw'>match</span> <span class='ident'>u</span> {
<span class='number'>0</span> <span class='op'>=></span> <span class='prelude-val'>Some</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Off</span>),
<span class='number'>1</span> <span class='op'>=></span> <span class='prelude-val'>Some</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Error</span>),
<span class='number'>2</span> <span class='op'>=></span> <span class='prelude-val'>Some</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Warn</span>),
<span class='number'>3</span> <span class='op'>=></span> <span class='prelude-val'>Some</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Info</span>),
<span class='number'>4</span> <span class='op'>=></span> <span class='prelude-val'>Some</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Debug</span>),
<span class='number'>5</span> <span class='op'>=></span> <span class='prelude-val'>Some</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Trace</span>),
_ <span class='op'>=></span> <span class='prelude-val'>None</span>
}
}
<span class='doccomment'>/// Returns the most verbose logging level filter.</span>
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>max</span>() <span class='op'>-></span> <span class='ident'>LogLevelFilter</span> {
<span class='ident'>LogLevelFilter</span>::<span class='ident'>Trace</span>
}
<span class='doccomment'>/// Converts `self` to the equivalent `LogLevel`.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// Returns `None` if `self` is `LogLevelFilter::Off`.</span>
<span class='attribute'>#[<span class='ident'>inline</span>]</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>to_log_level</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>LogLevel</span><span class='op'>></span> {
<span class='ident'>LogLevel</span>::<span class='ident'>from_usize</span>(<span class='op'>*</span><span class='self'>self</span> <span class='kw'>as</span> <span class='ident'>usize</span>)
}
}
<span class='doccomment'>/// The "payload" of a log message.</span>
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>LogRecord</span><span class='op'><</span><span class='lifetime'>'a</span><span class='op'>></span> {
<span class='ident'>metadata</span>: <span class='ident'>LogMetadata</span><span class='op'><</span><span class='lifetime'>'a</span><span class='op'>></span>,
<span class='ident'>location</span>: <span class='kw-2'>&</span><span class='lifetime'>'a</span> <span class='ident'>LogLocation</span>,
<span class='ident'>args</span>: <span class='ident'>fmt</span>::<span class='ident'>Arguments</span><span class='op'><</span><span class='lifetime'>'a</span><span class='op'>></span>,
}
<span class='kw'>impl</span><span class='op'><</span><span class='lifetime'>'a</span><span class='op'>></span> <span class='ident'>LogRecord</span><span class='op'><</span><span class='lifetime'>'a</span><span class='op'>></span> {
<span class='doccomment'>/// The message body.</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>args</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='kw-2'>&</span><span class='ident'>fmt</span>::<span class='ident'>Arguments</span><span class='op'><</span><span class='lifetime'>'a</span><span class='op'>></span> {
<span class='kw-2'>&</span><span class='self'>self</span>.<span class='ident'>args</span>
}
<span class='doccomment'>/// Metadata about the log directive.</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>metadata</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='kw-2'>&</span><span class='ident'>LogMetadata</span> {
<span class='kw-2'>&</span><span class='self'>self</span>.<span class='ident'>metadata</span>
}
<span class='doccomment'>/// The location of the log directive.</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>location</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='kw-2'>&</span><span class='ident'>LogLocation</span> {
<span class='self'>self</span>.<span class='ident'>location</span>
}
<span class='doccomment'>/// The verbosity level of the message.</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>level</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>LogLevel</span> {
<span class='self'>self</span>.<span class='ident'>metadata</span>.<span class='ident'>level</span>()
}
<span class='doccomment'>/// The name of the target of the directive.</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>target</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='kw-2'>&</span><span class='ident'>str</span> {
<span class='self'>self</span>.<span class='ident'>metadata</span>.<span class='ident'>target</span>()
}
}
<span class='doccomment'>/// Metadata about a log message.</span>
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>LogMetadata</span><span class='op'><</span><span class='lifetime'>'a</span><span class='op'>></span> {
<span class='ident'>level</span>: <span class='ident'>LogLevel</span>,
<span class='ident'>target</span>: <span class='kw-2'>&</span><span class='lifetime'>'a</span> <span class='ident'>str</span>,
}
<span class='kw'>impl</span><span class='op'><</span><span class='lifetime'>'a</span><span class='op'>></span> <span class='ident'>LogMetadata</span><span class='op'><</span><span class='lifetime'>'a</span><span class='op'>></span> {
<span class='doccomment'>/// The verbosity level of the message.</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>level</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>LogLevel</span> {
<span class='self'>self</span>.<span class='ident'>level</span>
}
<span class='doccomment'>/// The name of the target of the directive.</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>target</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='kw-2'>&</span><span class='ident'>str</span> {
<span class='self'>self</span>.<span class='ident'>target</span>
}
}
<span class='doccomment'>/// A trait encapsulating the operations required of a logger</span>
<span class='kw'>pub</span> <span class='kw'>trait</span> <span class='ident'>Log</span>: <span class='ident'>Sync</span><span class='op'>+</span><span class='ident'>Send</span> {
<span class='doccomment'>/// Determines if a log message with the specified metadata would be</span>
<span class='doccomment'>/// logged.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// This is used by the `log_enabled!` macro to allow callers to avoid</span>
<span class='doccomment'>/// expensive computation of log message arguments if the message would be</span>
<span class='doccomment'>/// discarded anyway.</span>
<span class='kw'>fn</span> <span class='ident'>enabled</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>metadata</span>: <span class='kw-2'>&</span><span class='ident'>LogMetadata</span>) <span class='op'>-></span> <span class='ident'>bool</span>;
<span class='doccomment'>/// Logs the `LogRecord`.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// Note that `enabled` is *not* necessarily called before this method.</span>
<span class='doccomment'>/// Implementations of `log` should perform all necessary filtering</span>
<span class='doccomment'>/// internally.</span>
<span class='kw'>fn</span> <span class='ident'>log</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>record</span>: <span class='kw-2'>&</span><span class='ident'>LogRecord</span>);
}
<span class='doccomment'>/// The location of a log message.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// # Warning</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// The fields of this struct are public so that they may be initialized by the</span>
<span class='doccomment'>/// `log!` macro. They are subject to change at any time and should never be</span>
<span class='doccomment'>/// accessed directly.</span>
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Copy</span>, <span class='ident'>Clone</span>, <span class='ident'>Debug</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>LogLocation</span> {
<span class='attribute'>#[<span class='ident'>doc</span>(<span class='ident'>hidden</span>)]</span>
<span class='kw'>pub</span> <span class='ident'>__module_path</span>: <span class='kw-2'>&</span><span class='lifetime'>'static</span> <span class='ident'>str</span>,
<span class='attribute'>#[<span class='ident'>doc</span>(<span class='ident'>hidden</span>)]</span>
<span class='kw'>pub</span> <span class='ident'>__file</span>: <span class='kw-2'>&</span><span class='lifetime'>'static</span> <span class='ident'>str</span>,
<span class='attribute'>#[<span class='ident'>doc</span>(<span class='ident'>hidden</span>)]</span>
<span class='kw'>pub</span> <span class='ident'>__line</span>: <span class='ident'>u32</span>,
}
<span class='kw'>impl</span> <span class='ident'>LogLocation</span> {
<span class='doccomment'>/// The module path of the message.</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>module_path</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='kw-2'>&</span><span class='ident'>str</span> {
<span class='self'>self</span>.<span class='ident'>__module_path</span>
}
<span class='doccomment'>/// The source file containing the message.</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>file</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='kw-2'>&</span><span class='ident'>str</span> {
<span class='self'>self</span>.<span class='ident'>__file</span>
}
<span class='doccomment'>/// The line containing the message.</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>line</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>u32</span> {
<span class='self'>self</span>.<span class='ident'>__line</span>
}
}
<span class='doccomment'>/// A token providing read and write access to the global maximum log level</span>
<span class='doccomment'>/// filter.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// The maximum log level is used as an optimization to avoid evaluating log</span>
<span class='doccomment'>/// messages that will be ignored by the logger. Any message with a level</span>
<span class='doccomment'>/// higher than the maximum log level filter will be ignored. A logger should</span>
<span class='doccomment'>/// make sure to keep the maximum log level filter in sync with its current</span>
<span class='doccomment'>/// configuration.</span>
<span class='attribute'>#[<span class='ident'>allow</span>(<span class='ident'>missing_copy_implementations</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>MaxLogLevelFilter</span>(());
<span class='kw'>impl</span> <span class='ident'>fmt</span>::<span class='ident'>Debug</span> <span class='kw'>for</span> <span class='ident'>MaxLogLevelFilter</span> {
<span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>fmt</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-></span> <span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span> {
<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>fmt</span>, <span class='string'>"MaxLogLevelFilter"</span>)
}
}
<span class='kw'>impl</span> <span class='ident'>MaxLogLevelFilter</span> {
<span class='doccomment'>/// Gets the current maximum log level filter.</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>get</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>LogLevelFilter</span> {
<span class='ident'>max_log_level</span>()
}
<span class='doccomment'>/// Sets the maximum log level.</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>set</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>level</span>: <span class='ident'>LogLevelFilter</span>) {
<span class='ident'>MAX_LOG_LEVEL_FILTER</span>.<span class='ident'>store</span>(<span class='ident'>level</span> <span class='kw'>as</span> <span class='ident'>usize</span>, <span class='ident'>Ordering</span>::<span class='ident'>SeqCst</span>)
}
}
<span class='doccomment'>/// Returns the current maximum log level.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// The `log!`, `error!`, `warn!`, `info!`, `debug!`, and `trace!` macros check</span>
<span class='doccomment'>/// this value and discard any message logged at a higher level. The maximum</span>
<span class='doccomment'>/// log level is set by the `MaxLogLevel` token passed to loggers.</span>
<span class='attribute'>#[<span class='ident'>inline</span>(<span class='ident'>always</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>max_log_level</span>() <span class='op'>-></span> <span class='ident'>LogLevelFilter</span> {
<span class='kw'>unsafe</span> { <span class='ident'>mem</span>::<span class='ident'>transmute</span>(<span class='ident'>MAX_LOG_LEVEL_FILTER</span>.<span class='ident'>load</span>(<span class='ident'>Ordering</span>::<span class='ident'>Relaxed</span>)) }
}
<span class='doccomment'>/// Sets the global logger.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// The `make_logger` closure is passed a `MaxLogLevel` object, which the</span>
<span class='doccomment'>/// logger should use to keep the global maximum log level in sync with the</span>
<span class='doccomment'>/// highest log level that the logger will not ignore.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// This function may only be called once in the lifetime of a program. Any log</span>
<span class='doccomment'>/// events that occur before the call to `set_logger` completes will be</span>
<span class='doccomment'>/// ignored.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// This function does not typically need to be called manually. Logger</span>
<span class='doccomment'>/// implementations should provide an initialization method that calls</span>
<span class='doccomment'>/// `set_logger` internally.</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>set_logger</span><span class='op'><</span><span class='ident'>M</span><span class='op'>></span>(<span class='ident'>make_logger</span>: <span class='ident'>M</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span>(), <span class='ident'>SetLoggerError</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>M</span>: <span class='ident'>FnOnce</span>(<span class='ident'>MaxLogLevelFilter</span>) <span class='op'>-></span> <span class='ident'>Box</span><span class='op'><</span><span class='ident'>Log</span><span class='op'>></span> {
<span class='kw'>if</span> <span class='ident'>LOGGER</span>.<span class='ident'>compare_and_swap</span>(<span class='ident'>UNINITIALIZED</span>, <span class='ident'>INITIALIZING</span>,
<span class='ident'>Ordering</span>::<span class='ident'>SeqCst</span>) <span class='op'>!=</span> <span class='ident'>UNINITIALIZED</span> {
<span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='ident'>SetLoggerError</span>(()));
}
<span class='kw'>let</span> <span class='ident'>logger</span> <span class='op'>=</span> <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='ident'>make_logger</span>(<span class='ident'>MaxLogLevelFilter</span>(())));
<span class='kw'>let</span> <span class='ident'>logger</span> <span class='op'>=</span> <span class='kw'>unsafe</span> { <span class='ident'>mem</span>::<span class='ident'>transmute</span>::<span class='op'><</span><span class='ident'>Box</span><span class='op'><</span><span class='ident'>Box</span><span class='op'><</span><span class='ident'>Log</span><span class='op'>>></span>, <span class='ident'>usize</span><span class='op'>></span>(<span class='ident'>logger</span>) };
<span class='ident'>LOGGER</span>.<span class='ident'>store</span>(<span class='ident'>logger</span>, <span class='ident'>Ordering</span>::<span class='ident'>SeqCst</span>);
<span class='kw'>unsafe</span> {
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>libc</span>::<span class='ident'>atexit</span>(<span class='ident'>shutdown</span>), <span class='number'>0</span>);
}
<span class='kw'>return</span> <span class='prelude-val'>Ok</span>(());
<span class='kw'>extern</span> <span class='kw'>fn</span> <span class='ident'>shutdown</span>() {
<span class='comment'>// Set to INITIALIZING to prevent re-initialization after</span>
<span class='kw'>let</span> <span class='ident'>logger</span> <span class='op'>=</span> <span class='ident'>LOGGER</span>.<span class='ident'>swap</span>(<span class='ident'>INITIALIZING</span>, <span class='ident'>Ordering</span>::<span class='ident'>SeqCst</span>);
<span class='kw'>while</span> <span class='ident'>REFCOUNT</span>.<span class='ident'>load</span>(<span class='ident'>Ordering</span>::<span class='ident'>SeqCst</span>) <span class='op'>!=</span> <span class='number'>0</span> {
<span class='comment'>// FIXME add a sleep here when it doesn't involve timers</span>
}
<span class='kw'>unsafe</span> { <span class='ident'>mem</span>::<span class='ident'>transmute</span>::<span class='op'><</span><span class='ident'>usize</span>, <span class='ident'>Box</span><span class='op'><</span><span class='ident'>Box</span><span class='op'><</span><span class='ident'>Log</span><span class='op'>>></span><span class='op'>></span>(<span class='ident'>logger</span>); }
}
}
<span class='doccomment'>/// The type returned by `set_logger` if `set_logger` has already been called.</span>
<span class='attribute'>#[<span class='ident'>allow</span>(<span class='ident'>missing_copy_implementations</span>)]</span>
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Debug</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>SetLoggerError</span>(());
<span class='kw'>impl</span> <span class='ident'>fmt</span>::<span class='ident'>Display</span> <span class='kw'>for</span> <span class='ident'>SetLoggerError</span> {
<span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&</span><span class='self'>self</span>, <span class='ident'>fmt</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-></span> <span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span> {
<span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>fmt</span>, <span class='string'>"attempted to set a logger after the logging system \
was already initialized"</span>)
}
}
<span class='kw'>impl</span> <span class='ident'>error</span>::<span class='ident'>Error</span> <span class='kw'>for</span> <span class='ident'>SetLoggerError</span> {
<span class='kw'>fn</span> <span class='ident'>description</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='kw-2'>&</span><span class='ident'>str</span> { <span class='string'>"set_logger() called multiple times"</span> }
}
<span class='kw'>struct</span> <span class='ident'>LoggerGuard</span>(<span class='ident'>usize</span>);
<span class='kw'>impl</span> <span class='ident'>Drop</span> <span class='kw'>for</span> <span class='ident'>LoggerGuard</span> {
<span class='kw'>fn</span> <span class='ident'>drop</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) {
<span class='ident'>REFCOUNT</span>.<span class='ident'>fetch_sub</span>(<span class='number'>1</span>, <span class='ident'>Ordering</span>::<span class='ident'>SeqCst</span>);
}
}
<span class='kw'>impl</span> <span class='ident'>Deref</span> <span class='kw'>for</span> <span class='ident'>LoggerGuard</span> {
<span class='kw'>type</span> <span class='ident'>Target</span> <span class='op'>=</span> <span class='ident'>Box</span><span class='op'><</span><span class='ident'>Log</span><span class='op'>></span>;
<span class='kw'>fn</span> <span class='ident'>deref</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='kw-2'>&</span><span class='ident'>Box</span><span class='op'><</span><span class='ident'>Log</span><span class='op'>+</span><span class='lifetime'>'static</span><span class='op'>></span> {
<span class='kw'>unsafe</span> { <span class='ident'>mem</span>::<span class='ident'>transmute</span>(<span class='self'>self</span>.<span class='number'>0</span>) }
}
}
<span class='kw'>fn</span> <span class='ident'>logger</span>() <span class='op'>-></span> <span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>LoggerGuard</span><span class='op'>></span> {
<span class='ident'>REFCOUNT</span>.<span class='ident'>fetch_add</span>(<span class='number'>1</span>, <span class='ident'>Ordering</span>::<span class='ident'>SeqCst</span>);
<span class='kw'>let</span> <span class='ident'>logger</span> <span class='op'>=</span> <span class='ident'>LOGGER</span>.<span class='ident'>load</span>(<span class='ident'>Ordering</span>::<span class='ident'>SeqCst</span>);
<span class='kw'>if</span> <span class='ident'>logger</span> <span class='op'>==</span> <span class='ident'>UNINITIALIZED</span> <span class='op'>||</span> <span class='ident'>logger</span> <span class='op'>==</span> <span class='ident'>INITIALIZING</span> {
<span class='ident'>REFCOUNT</span>.<span class='ident'>fetch_sub</span>(<span class='number'>1</span>, <span class='ident'>Ordering</span>::<span class='ident'>SeqCst</span>);
<span class='prelude-val'>None</span>
} <span class='kw'>else</span> {
<span class='prelude-val'>Some</span>(<span class='ident'>LoggerGuard</span>(<span class='ident'>logger</span>))
}
}
<span class='comment'>// WARNING</span>
<span class='comment'>// This is not considered part of the crate's public API. It is subject to</span>
<span class='comment'>// change at any time.</span>
<span class='attribute'>#[<span class='ident'>doc</span>(<span class='ident'>hidden</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>__enabled</span>(<span class='ident'>level</span>: <span class='ident'>LogLevel</span>, <span class='ident'>target</span>: <span class='kw-2'>&</span><span class='ident'>str</span>) <span class='op'>-></span> <span class='ident'>bool</span> {
<span class='kw'>if</span> <span class='kw'>let</span> <span class='prelude-val'>Some</span>(<span class='ident'>logger</span>) <span class='op'>=</span> <span class='ident'>logger</span>() {
<span class='ident'>logger</span>.<span class='ident'>enabled</span>(<span class='kw-2'>&</span><span class='ident'>LogMetadata</span> { <span class='ident'>level</span>: <span class='ident'>level</span>, <span class='ident'>target</span>: <span class='ident'>target</span> })
} <span class='kw'>else</span> {
<span class='boolval'>false</span>
}
}
<span class='comment'>// WARNING</span>
<span class='comment'>// This is not considered part of the crate's public API. It is subject to</span>
<span class='comment'>// change at any time.</span>
<span class='attribute'>#[<span class='ident'>doc</span>(<span class='ident'>hidden</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>__log</span>(<span class='ident'>level</span>: <span class='ident'>LogLevel</span>, <span class='ident'>target</span>: <span class='kw-2'>&</span><span class='ident'>str</span>, <span class='ident'>loc</span>: <span class='kw-2'>&</span><span class='ident'>LogLocation</span>,
<span class='ident'>args</span>: <span class='ident'>fmt</span>::<span class='ident'>Arguments</span>) {
<span class='kw'>if</span> <span class='kw'>let</span> <span class='prelude-val'>Some</span>(<span class='ident'>logger</span>) <span class='op'>=</span> <span class='ident'>logger</span>() {
<span class='kw'>let</span> <span class='ident'>record</span> <span class='op'>=</span> <span class='ident'>LogRecord</span> {
<span class='ident'>metadata</span>: <span class='ident'>LogMetadata</span> {
<span class='ident'>level</span>: <span class='ident'>level</span>,
<span class='ident'>target</span>: <span class='ident'>target</span>,
},
<span class='ident'>location</span>: <span class='ident'>loc</span>,
<span class='ident'>args</span>: <span class='ident'>args</span>
};
<span class='ident'>logger</span>.<span class='ident'>log</span>(<span class='kw-2'>&</span><span class='ident'>record</span>)
}
}
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span>
<span class='kw'>mod</span> <span class='ident'>tests</span> {
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>error</span>::<span class='ident'>Error</span>;
<span class='kw'>use</span> <span class='ident'>super</span>::{<span class='ident'>LogLevel</span>, <span class='ident'>LogLevelFilter</span>, <span class='ident'>SetLoggerError</span>};
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>test_loglevelfilter_from_str</span>() {
<span class='kw'>let</span> <span class='ident'>tests</span> <span class='op'>=</span> [
(<span class='string'>"off"</span>, <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Off</span>)),
(<span class='string'>"error"</span>, <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Error</span>)),
(<span class='string'>"warn"</span>, <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Warn</span>)),
(<span class='string'>"info"</span>, <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Info</span>)),
(<span class='string'>"debug"</span>, <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Debug</span>)),
(<span class='string'>"trace"</span>, <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Trace</span>)),
(<span class='string'>"OFF"</span>, <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Off</span>)),
(<span class='string'>"ERROR"</span>, <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Error</span>)),
(<span class='string'>"WARN"</span>, <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Warn</span>)),
(<span class='string'>"INFO"</span>, <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Info</span>)),
(<span class='string'>"DEBUG"</span>, <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Debug</span>)),
(<span class='string'>"TRACE"</span>, <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Trace</span>)),
(<span class='string'>"asdf"</span>, <span class='prelude-val'>Err</span>(())),
];
<span class='kw'>for</span> <span class='kw-2'>&</span>(<span class='ident'>s</span>, <span class='kw-2'>ref</span> <span class='ident'>expected</span>) <span class='kw'>in</span> <span class='kw-2'>&</span><span class='ident'>tests</span> {
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>expected</span>, <span class='kw-2'>&</span><span class='ident'>s</span>.<span class='ident'>parse</span>());
}
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>test_loglevel_from_str</span>() {
<span class='kw'>let</span> <span class='ident'>tests</span> <span class='op'>=</span> [
(<span class='string'>"OFF"</span>, <span class='prelude-val'>Err</span>(())),
(<span class='string'>"error"</span>, <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevel</span>::<span class='ident'>Error</span>)),
(<span class='string'>"warn"</span>, <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevel</span>::<span class='ident'>Warn</span>)),
(<span class='string'>"info"</span>, <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevel</span>::<span class='ident'>Info</span>)),
(<span class='string'>"debug"</span>, <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevel</span>::<span class='ident'>Debug</span>)),
(<span class='string'>"trace"</span>, <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevel</span>::<span class='ident'>Trace</span>)),
(<span class='string'>"ERROR"</span>, <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevel</span>::<span class='ident'>Error</span>)),
(<span class='string'>"WARN"</span>, <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevel</span>::<span class='ident'>Warn</span>)),
(<span class='string'>"INFO"</span>, <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevel</span>::<span class='ident'>Info</span>)),
(<span class='string'>"DEBUG"</span>, <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevel</span>::<span class='ident'>Debug</span>)),
(<span class='string'>"TRACE"</span>, <span class='prelude-val'>Ok</span>(<span class='ident'>LogLevel</span>::<span class='ident'>Trace</span>)),
(<span class='string'>"asdf"</span>, <span class='prelude-val'>Err</span>(())),
];
<span class='kw'>for</span> <span class='kw-2'>&</span>(<span class='ident'>s</span>, <span class='kw-2'>ref</span> <span class='ident'>expected</span>) <span class='kw'>in</span> <span class='kw-2'>&</span><span class='ident'>tests</span> {
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>expected</span>, <span class='kw-2'>&</span><span class='ident'>s</span>.<span class='ident'>parse</span>());
}
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>test_loglevel_show</span>() {
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='string'>"INFO"</span>, <span class='ident'>LogLevel</span>::<span class='ident'>Info</span>.<span class='ident'>to_string</span>());
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='string'>"ERROR"</span>, <span class='ident'>LogLevel</span>::<span class='ident'>Error</span>.<span class='ident'>to_string</span>());
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>test_loglevelfilter_show</span>() {
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='string'>"OFF"</span>, <span class='ident'>LogLevelFilter</span>::<span class='ident'>Off</span>.<span class='ident'>to_string</span>());
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='string'>"ERROR"</span>, <span class='ident'>LogLevelFilter</span>::<span class='ident'>Error</span>.<span class='ident'>to_string</span>());
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>test_cross_cmp</span>() {
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>LogLevel</span>::<span class='ident'>Debug</span> <span class='op'>></span> <span class='ident'>LogLevelFilter</span>::<span class='ident'>Error</span>);
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Warn</span> <span class='op'><</span> <span class='ident'>LogLevel</span>::<span class='ident'>Trace</span>);
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Off</span> <span class='op'><</span> <span class='ident'>LogLevel</span>::<span class='ident'>Error</span>);
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>test_cross_eq</span>() {
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>LogLevel</span>::<span class='ident'>Error</span> <span class='op'>==</span> <span class='ident'>LogLevelFilter</span>::<span class='ident'>Error</span>);
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Off</span> <span class='op'>!=</span> <span class='ident'>LogLevel</span>::<span class='ident'>Error</span>);
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>LogLevel</span>::<span class='ident'>Trace</span> <span class='op'>==</span> <span class='ident'>LogLevelFilter</span>::<span class='ident'>Trace</span>);
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>test_to_log_level</span>() {
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>(<span class='ident'>LogLevel</span>::<span class='ident'>Error</span>), <span class='ident'>LogLevelFilter</span>::<span class='ident'>Error</span>.<span class='ident'>to_log_level</span>());
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>None</span>, <span class='ident'>LogLevelFilter</span>::<span class='ident'>Off</span>.<span class='ident'>to_log_level</span>());
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>(<span class='ident'>LogLevel</span>::<span class='ident'>Debug</span>), <span class='ident'>LogLevelFilter</span>::<span class='ident'>Debug</span>.<span class='ident'>to_log_level</span>());
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>test_to_log_level_filter</span>() {
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Error</span>, <span class='ident'>LogLevel</span>::<span class='ident'>Error</span>.<span class='ident'>to_log_level_filter</span>());
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>LogLevelFilter</span>::<span class='ident'>Trace</span>, <span class='ident'>LogLevel</span>::<span class='ident'>Trace</span>.<span class='ident'>to_log_level_filter</span>());
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>test_error_trait</span>() {
<span class='kw'>let</span> <span class='ident'>e</span> <span class='op'>=</span> <span class='ident'>SetLoggerError</span>(());
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>e</span>.<span class='ident'>description</span>(), <span class='string'>"set_logger() called multiple times"</span>);
}
}
</pre>
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