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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/home/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/env_logger-0.3.5/src/lib.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>lib.rs - source</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled ><script id="default-settings" ></script><script src="../../storage.js"></script><script src="../../crates.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="shortcut icon" href="http://www.rust-lang.org/favicon.ico"><style type="text/css">#crate-search{background-image:url("../../down-arrow.svg");}</style></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu" role="button">☰</div><a href='../../env_logger/index.html'><div class='logo-container rust-logo'><img src='http://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png' alt='logo'></div></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><img width="18" height="18" alt="Pick another theme!" src="../../brush.svg"></button><div id="theme-choices" role="menu"></div></div><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input"name="search" disabled autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" id="help-button" title="help">?</button><a id="settings-menu" href="../../settings.html" title="settings"><img width="18" height="18" alt="Change settings" src="../../wheel.svg"></a></div></form></nav><section id="main" class="content"><div class="example-wrap"><pre class="line-numbers"><span id="1"> 1</span>
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</pre><pre class="rust">
<span class="comment">// Copyright 2014-2015 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 logger configured via an environment variable which writes to standard</span>
<span class="doccomment">//! error.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ## Example</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//! #[macro_use] extern crate log;</span>
<span class="doccomment">//! extern crate env_logger;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! use log::LogLevel;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! fn main() {</span>
<span class="doccomment">//! env_logger::init().unwrap();</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! debug!("this is a debug {}", "message");</span>
<span class="doccomment">//! error!("this is printed by default");</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! if log_enabled!(LogLevel::Info) {</span>
<span class="doccomment">//! let x = 3 * 4; // expensive computation</span>
<span class="doccomment">//! info!("the answer was: {}", x);</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Assumes the binary is `main`:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```{.bash}</span>
<span class="doccomment">//! $ RUST_LOG=error ./main</span>
<span class="doccomment">//! ERROR:main: this is printed by default</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```{.bash}</span>
<span class="doccomment">//! $ RUST_LOG=info ./main</span>
<span class="doccomment">//! ERROR:main: this is printed by default</span>
<span class="doccomment">//! INFO:main: the answer was: 12</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```{.bash}</span>
<span class="doccomment">//! $ RUST_LOG=debug ./main</span>
<span class="doccomment">//! DEBUG:main: this is a debug message</span>
<span class="doccomment">//! ERROR:main: this is printed by default</span>
<span class="doccomment">//! INFO:main: the answer was: 12</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! You can also set the log level on a per module basis:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```{.bash}</span>
<span class="doccomment">//! $ RUST_LOG=main=info ./main</span>
<span class="doccomment">//! ERROR:main: this is printed by default</span>
<span class="doccomment">//! INFO:main: the answer was: 12</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! And enable all logging:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```{.bash}</span>
<span class="doccomment">//! $ RUST_LOG=main ./main</span>
<span class="doccomment">//! DEBUG:main: this is a debug message</span>
<span class="doccomment">//! ERROR:main: this is printed by default</span>
<span class="doccomment">//! INFO:main: the answer was: 12</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! See the documentation for the log crate for more information about its API.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ## Enabling logging</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Log levels are controlled on a per-module basis, and by default all logging</span>
<span class="doccomment">//! is disabled except for `error!`. Logging is controlled via the `RUST_LOG`</span>
<span class="doccomment">//! environment variable. The value of this environment variable is a</span>
<span class="doccomment">//! comma-separated list of logging directives. A logging directive is of the</span>
<span class="doccomment">//! form:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```text</span>
<span class="doccomment">//! path::to::module=log_level</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The path to the module is rooted in the name of the crate it was compiled</span>
<span class="doccomment">//! for, so if your program is contained in a file `hello.rs`, for example, to</span>
<span class="doccomment">//! turn on logging for this file you would use a value of `RUST_LOG=hello`.</span>
<span class="doccomment">//! Furthermore, this path is a prefix-search, so all modules nested in the</span>
<span class="doccomment">//! specified module will also have logging enabled.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The actual `log_level` is optional to specify. If omitted, all logging will</span>
<span class="doccomment">//! be enabled. If specified, it must be one of the strings `debug`, `error`,</span>
<span class="doccomment">//! `info`, `warn`, or `trace`.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! As the log level for a module is optional, the module to enable logging for</span>
<span class="doccomment">//! is also optional. If only a `log_level` is provided, then the global log</span>
<span class="doccomment">//! level for all modules is set to this value.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Some examples of valid values of `RUST_LOG` are:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! * `hello` turns on all logging for the 'hello' module</span>
<span class="doccomment">//! * `info` turns on all info logging</span>
<span class="doccomment">//! * `hello=debug` turns on debug logging for 'hello'</span>
<span class="doccomment">//! * `hello,std::option` turns on hello, and std's option logging</span>
<span class="doccomment">//! * `error,hello=warn` turn on global error logging and also warn for hello</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ## Filtering results</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! A RUST_LOG directive may include a regex filter. The syntax is to append `/`</span>
<span class="doccomment">//! followed by a regex. Each message is checked against the regex, and is only</span>
<span class="doccomment">//! logged if it matches. Note that the matching is done after formatting the</span>
<span class="doccomment">//! log string but before adding any logging meta-data. There is a single filter</span>
<span class="doccomment">//! for all modules.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Some examples:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! * `hello/foo` turns on all logging for the 'hello' module where the log</span>
<span class="doccomment">//! message includes 'foo'.</span>
<span class="doccomment">//! * `info/f.o` turns on all info logging where the log message includes 'foo',</span>
<span class="doccomment">//! 'f1o', 'fao', etc.</span>
<span class="doccomment">//! * `hello=debug/foo*foo` turns on debug logging for 'hello' where the log</span>
<span class="doccomment">//! message includes 'foofoo' or 'fofoo' or 'fooooooofoo', etc.</span>
<span class="doccomment">//! * `error,hello=warn/[0-9] scopes` turn on global error logging and also</span>
<span class="doccomment">//! warn for hello. In both cases the log message must include a single digit</span>
<span class="doccomment">//! number followed by 'scopes'.</span>
<span class="attribute">#![<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/env_logger/"</span>)]</span>
<span class="attribute">#![<span class="ident">cfg_attr</span>(<span class="ident">test</span>, <span class="ident">deny</span>(<span class="ident">warnings</span>))]</span>
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">log</span>;
<span class="kw">use</span> <span class="ident">std::env</span>;
<span class="kw">use</span> <span class="ident">std::io::prelude</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="ident">std::io</span>;
<span class="kw">use</span> <span class="ident">std::mem</span>;
<span class="kw">use</span> <span class="ident">log</span>::{<span class="ident">Log</span>, <span class="ident">LogLevel</span>, <span class="ident">LogLevelFilter</span>, <span class="ident">LogRecord</span>, <span class="ident">SetLoggerError</span>, <span class="ident">LogMetadata</span>};
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"regex"</span>)]</span>
<span class="attribute">#[<span class="ident">path</span> <span class="op">=</span> <span class="string">"regex.rs"</span>]</span>
<span class="kw">mod</span> <span class="ident">filter</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"regex"</span>))]</span>
<span class="attribute">#[<span class="ident">path</span> <span class="op">=</span> <span class="string">"string.rs"</span>]</span>
<span class="kw">mod</span> <span class="ident">filter</span>;
<span class="doccomment">/// The logger.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Logger</span> {
<span class="ident">directives</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">LogDirective</span><span class="op">></span>,
<span class="ident">filter</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">filter::Filter</span><span class="op">></span>,
<span class="ident">format</span>: <span class="ident">Box</span><span class="op"><</span><span class="ident">Fn</span>(<span class="kw-2">&</span><span class="ident">LogRecord</span>) <span class="op">-</span><span class="op">></span> <span class="ident">String</span> <span class="op">+</span> <span class="ident">Sync</span> <span class="op">+</span> <span class="ident">Send</span><span class="op">></span>,
}
<span class="doccomment">/// LogBuilder acts as builder for initializing the Logger.</span>
<span class="doccomment">/// It can be used to customize the log format, change the enviromental variable used</span>
<span class="doccomment">/// to provide the logging directives and also set the default log level filter.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ## Example</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #[macro_use]</span>
<span class="doccomment">/// extern crate log;</span>
<span class="doccomment">/// extern crate env_logger;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// use std::env;</span>
<span class="doccomment">/// use log::{LogRecord, LogLevelFilter};</span>
<span class="doccomment">/// use env_logger::LogBuilder;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fn main() {</span>
<span class="doccomment">/// let format = |record: &LogRecord| {</span>
<span class="doccomment">/// format!("{} - {}", record.level(), record.args())</span>
<span class="doccomment">/// };</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut builder = LogBuilder::new();</span>
<span class="doccomment">/// builder.format(format).filter(None, LogLevelFilter::Info);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// if env::var("RUST_LOG").is_ok() {</span>
<span class="doccomment">/// builder.parse(&env::var("RUST_LOG").unwrap());</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// builder.init().unwrap();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// error!("error message");</span>
<span class="doccomment">/// info!("info message");</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">LogBuilder</span> {
<span class="ident">directives</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">LogDirective</span><span class="op">></span>,
<span class="ident">filter</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">filter::Filter</span><span class="op">></span>,
<span class="ident">format</span>: <span class="ident">Box</span><span class="op"><</span><span class="ident">Fn</span>(<span class="kw-2">&</span><span class="ident">LogRecord</span>) <span class="op">-</span><span class="op">></span> <span class="ident">String</span> <span class="op">+</span> <span class="ident">Sync</span> <span class="op">+</span> <span class="ident">Send</span><span class="op">></span>,
}
<span class="kw">impl</span> <span class="ident">LogBuilder</span> {
<span class="doccomment">/// Initializes the log builder with defaults</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-</span><span class="op">></span> <span class="ident">LogBuilder</span> {
<span class="ident">LogBuilder</span> {
<span class="ident">directives</span>: <span class="ident">Vec::new</span>(),
<span class="ident">filter</span>: <span class="prelude-val">None</span>,
<span class="ident">format</span>: <span class="ident">Box::new</span>(<span class="op">|</span><span class="ident">record</span>: <span class="kw-2">&</span><span class="ident">LogRecord</span><span class="op">|</span> {
<span class="macro">format!</span>(<span class="string">"{}:{}: {}"</span>, <span class="ident">record</span>.<span class="ident">level</span>(),
<span class="ident">record</span>.<span class="ident">location</span>().<span class="ident">module_path</span>(), <span class="ident">record</span>.<span class="ident">args</span>())
}),
}
}
<span class="doccomment">/// Adds filters to the logger</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The given module (if any) will log at most the specified level provided.</span>
<span class="doccomment">/// If no module is provided then the filter will apply to all log messages.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">filter</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>,
<span class="ident">module</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span><span class="op">></span>,
<span class="ident">level</span>: <span class="ident">LogLevelFilter</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">Self</span> {
<span class="self">self</span>.<span class="ident">directives</span>.<span class="ident">push</span>(<span class="ident">LogDirective</span> {
<span class="ident">name</span>: <span class="ident">module</span>.<span class="ident">map</span>(<span class="op">|</span><span class="ident">s</span><span class="op">|</span> <span class="ident">s</span>.<span class="ident">to_string</span>()),
<span class="ident">level</span>: <span class="ident">level</span>,
});
<span class="self">self</span>
}
<span class="doccomment">/// Sets the format function for formatting the log output.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function is called on each record logged to produce a string which</span>
<span class="doccomment">/// is actually printed out.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">format</span><span class="op"><</span><span class="ident">F</span>: <span class="lifetime">'static</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">format</span>: <span class="ident">F</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">Self</span>
<span class="kw">where</span> <span class="ident">F</span>: <span class="ident">Fn</span>(<span class="kw-2">&</span><span class="ident">LogRecord</span>) <span class="op">-</span><span class="op">></span> <span class="ident">String</span> <span class="op">+</span> <span class="ident">Sync</span> <span class="op">+</span> <span class="ident">Send</span>
{
<span class="self">self</span>.<span class="ident">format</span> <span class="op">=</span> <span class="ident">Box::new</span>(<span class="ident">format</span>);
<span class="self">self</span>
}
<span class="doccomment">/// Parses the directives string in the same form as the RUST_LOG</span>
<span class="doccomment">/// environment variable.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// See the module documentation for more details.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">parse</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">filters</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">Self</span> {
<span class="kw">let</span> (<span class="ident">directives</span>, <span class="ident">filter</span>) <span class="op">=</span> <span class="ident">parse_logging_spec</span>(<span class="ident">filters</span>);
<span class="self">self</span>.<span class="ident">filter</span> <span class="op">=</span> <span class="ident">filter</span>;
<span class="kw">for</span> <span class="ident">directive</span> <span class="kw">in</span> <span class="ident">directives</span> {
<span class="self">self</span>.<span class="ident">directives</span>.<span class="ident">push</span>(<span class="ident">directive</span>);
}
<span class="self">self</span>
}
<span class="doccomment">/// Initializes the global logger with an env logger.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This should be called early in the execution of a Rust program, and the</span>
<span class="doccomment">/// global logger may only be initialized once. Future initialization</span>
<span class="doccomment">/// attempts will return an error.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">init</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</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="ident">log::set_logger</span>(<span class="op">|</span><span class="ident">max_level</span><span class="op">|</span> {
<span class="kw">let</span> <span class="ident">logger</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">build</span>();
<span class="ident">max_level</span>.<span class="ident">set</span>(<span class="ident">logger</span>.<span class="ident">filter</span>());
<span class="ident">Box::new</span>(<span class="ident">logger</span>)
})
}
<span class="doccomment">/// Build an env logger.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">build</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Logger</span> {
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">directives</span>.<span class="ident">is_empty</span>() {
<span class="comment">// Adds the default filter if none exist</span>
<span class="self">self</span>.<span class="ident">directives</span>.<span class="ident">push</span>(<span class="ident">LogDirective</span> {
<span class="ident">name</span>: <span class="prelude-val">None</span>,
<span class="ident">level</span>: <span class="ident">LogLevelFilter::Error</span>,
});
} <span class="kw">else</span> {
<span class="comment">// Sort the directives by length of their name, this allows a</span>
<span class="comment">// little more efficient lookup at runtime.</span>
<span class="self">self</span>.<span class="ident">directives</span>.<span class="ident">sort_by</span>(<span class="op">|</span><span class="ident">a</span>, <span class="ident">b</span><span class="op">|</span> {
<span class="kw">let</span> <span class="ident">alen</span> <span class="op">=</span> <span class="ident">a</span>.<span class="ident">name</span>.<span class="ident">as_ref</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">a</span><span class="op">|</span> <span class="ident">a</span>.<span class="ident">len</span>()).<span class="ident">unwrap_or</span>(<span class="number">0</span>);
<span class="kw">let</span> <span class="ident">blen</span> <span class="op">=</span> <span class="ident">b</span>.<span class="ident">name</span>.<span class="ident">as_ref</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">b</span><span class="op">|</span> <span class="ident">b</span>.<span class="ident">len</span>()).<span class="ident">unwrap_or</span>(<span class="number">0</span>);
<span class="ident">alen</span>.<span class="ident">cmp</span>(<span class="kw-2">&</span><span class="ident">blen</span>)
});
}
<span class="ident">Logger</span> {
<span class="ident">directives</span>: <span class="ident">mem::replace</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">directives</span>, <span class="ident">Vec::new</span>()),
<span class="ident">filter</span>: <span class="ident">mem::replace</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">filter</span>, <span class="prelude-val">None</span>),
<span class="ident">format</span>: <span class="ident">mem::replace</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">format</span>, <span class="ident">Box::new</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="ident">String::new</span>())),
}
}
}
<span class="kw">impl</span> <span class="ident">Logger</span> {
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-</span><span class="op">></span> <span class="ident">Logger</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">builder</span> <span class="op">=</span> <span class="ident">LogBuilder::new</span>();
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">s</span>) <span class="op">=</span> <span class="ident">env::var</span>(<span class="string">"RUST_LOG"</span>) {
<span class="ident">builder</span>.<span class="ident">parse</span>(<span class="kw-2">&</span><span class="ident">s</span>);
}
<span class="ident">builder</span>.<span class="ident">build</span>()
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">filter</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">LogLevelFilter</span> {
<span class="self">self</span>.<span class="ident">directives</span>.<span class="ident">iter</span>()
.<span class="ident">map</span>(<span class="op">|</span><span class="ident">d</span><span class="op">|</span> <span class="ident">d</span>.<span class="ident">level</span>).<span class="ident">max</span>()
.<span class="ident">unwrap_or</span>(<span class="ident">LogLevelFilter::Off</span>)
}
<span class="kw">fn</span> <span class="ident">enabled</span>(<span class="kw-2">&</span><span class="self">self</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="op">></span> <span class="ident">bool</span> {
<span class="comment">// Search for the longest match, the vector is assumed to be pre-sorted.</span>
<span class="kw">for</span> <span class="ident">directive</span> <span class="kw">in</span> <span class="self">self</span>.<span class="ident">directives</span>.<span class="ident">iter</span>().<span class="ident">rev</span>() {
<span class="kw">match</span> <span class="ident">directive</span>.<span class="ident">name</span> {
<span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="ident">name</span>) <span class="kw">if</span> <span class="op">!</span><span class="ident">target</span>.<span class="ident">starts_with</span>(<span class="kw-2">&</span><span class="kw-2">*</span><span class="kw-2">*</span><span class="ident">name</span>) <span class="op">=</span><span class="op">></span> {},
<span class="prelude-val">Some</span>(..) <span class="op">|</span> <span class="prelude-val">None</span> <span class="op">=</span><span class="op">></span> {
<span class="kw">return</span> <span class="ident">level</span> <span class="op"><</span><span class="op">=</span> <span class="ident">directive</span>.<span class="ident">level</span>
}
}
}
<span class="bool-val">false</span>
}
}
<span class="kw">impl</span> <span class="ident">Log</span> <span class="kw">for</span> <span class="ident">Logger</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="op">></span> <span class="ident">bool</span> {
<span class="self">self</span>.<span class="ident">enabled</span>(<span class="ident">metadata</span>.<span class="ident">level</span>(), <span class="ident">metadata</span>.<span class="ident">target</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="kw">if</span> <span class="op">!</span><span class="ident">Log::enabled</span>(<span class="self">self</span>, <span class="ident">record</span>.<span class="ident">metadata</span>()) {
<span class="kw">return</span>;
}
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">filter</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">filter</span>.<span class="ident">as_ref</span>() {
<span class="kw">if</span> <span class="op">!</span><span class="ident">filter</span>.<span class="ident">is_match</span>(<span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">record</span>.<span class="ident">args</span>().<span class="ident">to_string</span>()) {
<span class="kw">return</span>;
}
}
<span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="macro">writeln!</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">io::stderr</span>(), <span class="string">"{}"</span>, (<span class="self">self</span>.<span class="ident">format</span>)(<span class="ident">record</span>));
}
}
<span class="kw">struct</span> <span class="ident">LogDirective</span> {
<span class="ident">name</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">String</span><span class="op">></span>,
<span class="ident">level</span>: <span class="ident">LogLevelFilter</span>,
}
<span class="doccomment">/// Initializes the global logger with an env logger.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This should be called early in the execution of a Rust program, and the</span>
<span class="doccomment">/// global logger may only be initialized once. Future initialization attempts</span>
<span class="doccomment">/// will return an error.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">init</span>() <span class="op">-</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">let</span> <span class="kw-2">mut</span> <span class="ident">builder</span> <span class="op">=</span> <span class="ident">LogBuilder::new</span>();
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">s</span>) <span class="op">=</span> <span class="ident">env::var</span>(<span class="string">"RUST_LOG"</span>) {
<span class="ident">builder</span>.<span class="ident">parse</span>(<span class="kw-2">&</span><span class="ident">s</span>);
}
<span class="ident">builder</span>.<span class="ident">init</span>()
}
<span class="doccomment">/// Parse a logging specification string (e.g: "crate1,crate2::mod3,crate3::x=error/foo")</span>
<span class="doccomment">/// and return a vector with log directives.</span>
<span class="kw">fn</span> <span class="ident">parse_logging_spec</span>(<span class="ident">spec</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-</span><span class="op">></span> (<span class="ident">Vec</span><span class="op"><</span><span class="ident">LogDirective</span><span class="op">></span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">filter::Filter</span><span class="op">></span>) {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">dirs</span> <span class="op">=</span> <span class="ident">Vec::new</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">parts</span> <span class="op">=</span> <span class="ident">spec</span>.<span class="ident">split</span>(<span class="string">'/'</span>);
<span class="kw">let</span> <span class="ident">mods</span> <span class="op">=</span> <span class="ident">parts</span>.<span class="ident">next</span>();
<span class="kw">let</span> <span class="ident">filter</span> <span class="op">=</span> <span class="ident">parts</span>.<span class="ident">next</span>();
<span class="kw">if</span> <span class="ident">parts</span>.<span class="ident">next</span>().<span class="ident">is_some</span>() {
<span class="macro">println!</span>(<span class="string">"warning: invalid logging spec '{}', \
ignoring it (too many '/'s)"</span>, <span class="ident">spec</span>);
<span class="kw">return</span> (<span class="ident">dirs</span>, <span class="prelude-val">None</span>);
}
<span class="ident">mods</span>.<span class="ident">map</span>(<span class="op">|</span><span class="ident">m</span><span class="op">|</span> { <span class="kw">for</span> <span class="ident">s</span> <span class="kw">in</span> <span class="ident">m</span>.<span class="ident">split</span>(<span class="string">','</span>) {
<span class="kw">if</span> <span class="ident">s</span>.<span class="ident">len</span>() <span class="op">=</span><span class="op">=</span> <span class="number">0</span> { <span class="kw">continue</span> }
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">parts</span> <span class="op">=</span> <span class="ident">s</span>.<span class="ident">split</span>(<span class="string">'='</span>);
<span class="kw">let</span> (<span class="ident">log_level</span>, <span class="ident">name</span>) <span class="op">=</span> <span class="kw">match</span> (<span class="ident">parts</span>.<span class="ident">next</span>(), <span class="ident">parts</span>.<span class="ident">next</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">s</span><span class="op">|</span> <span class="ident">s</span>.<span class="ident">trim</span>()), <span class="ident">parts</span>.<span class="ident">next</span>()) {
(<span class="prelude-val">Some</span>(<span class="ident">part0</span>), <span class="prelude-val">None</span>, <span class="prelude-val">None</span>) <span class="op">=</span><span class="op">></span> {