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426 lines
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<title>log - Rust</title>
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<p class='location'>Crate log</p><div class="sidebar-elems"><div class="block items"><ul><li><a href="#macros">Macros</a></li><li><a href="#structs">Structs</a></li><li><a href="#enums">Enums</a></li><li><a href="#traits">Traits</a></li><li><a href="#functions">Functions</a></li></ul></div><p class='location'></p><script>window.sidebarCurrent = {name: 'log', ty: 'mod', relpath: '../'};</script></div>
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</nav>
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<section id='main' class="content">
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<h1 class='fqn'><span class='in-band'>Crate <a class="mod" href=''>log</a></span><span class='out-of-band'><span id='render-detail'>
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<a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">
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[<span class='inner'>−</span>]
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</a>
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</span><a class='srclink' href='../src/log/lib.rs.html#11-1091' title='goto source code'>[src]</a></span></h1>
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<div class='docblock'><p>A lightweight logging facade.</p>
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<p>A logging facade provides a single logging API that abstracts over the
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actual logging implementation. Libraries can use the logging API provided
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by this crate, and the consumer of those libraries can choose the logging
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framework that is most suitable for its use case.</p>
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<p>If no logging implementation is selected, the facade falls back to a "noop"
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implementation that ignores all log messages. The overhead in this case
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is very small - just an integer load, comparison and jump.</p>
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<p>A log request consists of a target, a level, and a body. A target is a
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string which defaults to the module path of the location of the log
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request, though that default may be overridden. Logger implementations
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typically use the target to filter requests based on some user
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configuration.</p>
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<h1 id="use" class="section-header"><a href="#use">Use</a></h1><h2 id="in-libraries" class="section-header"><a href="#in-libraries">In libraries</a></h2>
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<p>Libraries should link only to the <code>log</code> crate, and use the provided
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macros to log whatever information will be useful to downstream consumers.</p>
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<h3 id="examples" class="section-header"><a href="#examples">Examples</a></h3>
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<pre class="rust rust-example-rendered">
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<span class="attribute">#[<span class="ident">macro_use</span>]</span>
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<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">log</span>;
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<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">shave_the_yak</span>(<span class="ident">yak</span>: <span class="kw-2">&</span><span class="ident">Yak</span>) {
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<span class="macro">info</span><span class="macro">!</span>(<span class="ident">target</span>: <span class="string">"yak_events"</span>, <span class="string">"Commencing yak shaving for {:?}"</span>, <span class="ident">yak</span>);
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<span class="kw">loop</span> {
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<span class="kw">match</span> <span class="ident">find_a_razor</span>() {
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<span class="prelude-val">Ok</span>(<span class="ident">razor</span>) <span class="op">=></span> {
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<span class="macro">info</span><span class="macro">!</span>(<span class="string">"Razor located: {}"</span>, <span class="ident">razor</span>);
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<span class="ident">yak</span>.<span class="ident">shave</span>(<span class="ident">razor</span>);
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<span class="kw">break</span>;
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}
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<span class="prelude-val">Err</span>(<span class="ident">err</span>) <span class="op">=></span> {
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<span class="macro">warn</span><span class="macro">!</span>(<span class="string">"Unable to locate a razor: {}, retrying"</span>, <span class="ident">err</span>);
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}
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}
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}
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}</pre>
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<h2 id="in-executables" class="section-header"><a href="#in-executables">In executables</a></h2>
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<p>Executables should choose a logging framework and initialize it early in the
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runtime of the program. Logging frameworks will typically include a
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function to do this. Any log messages generated before the framework is
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initialized will be ignored.</p>
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<p>The executable itself may use the <code>log</code> crate to log as well.</p>
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<h3 id="warning" class="section-header"><a href="#warning">Warning</a></h3>
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<p>The logging system may only be initialized once.</p>
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<h3 id="examples-1" class="section-header"><a href="#examples-1">Examples</a></h3>
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<div class='information'><div class='tooltip ignore'>ⓘ<span class='tooltiptext'>This example is not tested</span></div></div><pre class="rust rust-example-rendered ignore">
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<span class="attribute">#[<span class="ident">macro_use</span>]</span>
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<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">log</span>;
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<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">my_logger</span>;
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<span class="kw">fn</span> <span class="ident">main</span>() {
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<span class="ident">my_logger</span>::<span class="ident">init</span>();
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<span class="macro">info</span><span class="macro">!</span>(<span class="string">"starting up"</span>);
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<span class="comment">// ...</span>
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}</pre>
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<h1 id="logger-implementations" class="section-header"><a href="#logger-implementations">Logger implementations</a></h1>
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<p>Loggers implement the <code>Log</code> trait. Here's a very basic example that simply
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logs all messages at the <code>Error</code>, <code>Warn</code> or <code>Info</code> levels to stdout:</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">log</span>;
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<span class="kw">use</span> <span class="ident">log</span>::{<span class="ident">LogRecord</span>, <span class="ident">LogLevel</span>, <span class="ident">LogMetadata</span>};
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<span class="kw">struct</span> <span class="ident">SimpleLogger</span>;
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<span class="kw">impl</span> <span class="ident">log</span>::<span class="ident">Log</span> <span class="kw">for</span> <span class="ident">SimpleLogger</span> {
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<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> {
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<span class="ident">metadata</span>.<span class="ident">level</span>() <span class="op"><=</span> <span class="ident">LogLevel</span>::<span class="ident">Info</span>
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}
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<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>) {
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<span class="kw">if</span> <span class="self">self</span>.<span class="ident">enabled</span>(<span class="ident">record</span>.<span class="ident">metadata</span>()) {
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<span class="macro">println</span><span class="macro">!</span>(<span class="string">"{} - {}"</span>, <span class="ident">record</span>.<span class="ident">level</span>(), <span class="ident">record</span>.<span class="ident">args</span>());
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}
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}
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}
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</pre>
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<p>Loggers are installed by calling the <code>set_logger</code> function. It takes a
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closure which is provided a <code>MaxLogLevel</code> token and returns a <code>Log</code> trait
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object. The <code>MaxLogLevel</code> token controls the global maximum log level. The
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logging facade uses this as an optimization to improve performance of log
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messages at levels that are disabled. In the case of our example logger,
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we'll want to set the maximum log level to <code>Info</code>, since we ignore any
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<code>Debug</code> or <code>Trace</code> level log messages. A logging framework should provide a
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function that wraps a call to <code>set_logger</code>, handling initialization of the
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logger:</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">init</span>() <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>(), <span class="ident">SetLoggerError</span><span class="op">></span> {
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<span class="ident">log</span>::<span class="ident">set_logger</span>(<span class="op">|</span><span class="ident">max_log_level</span><span class="op">|</span> {
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<span class="ident">max_log_level</span>.<span class="ident">set</span>(<span class="ident">LogLevelFilter</span>::<span class="ident">Info</span>);
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<span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">SimpleLogger</span>)
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})
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}</pre>
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<h1 id="use-with-no_std" class="section-header"><a href="#use-with-no_std">Use with <code>no_std</code></a></h1>
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<p>To use the <code>log</code> crate without depending on <code>libstd</code>, you need to specify
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<code>default-features = false</code> when specifying the dependency in <code>Cargo.toml</code>.
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This makes no difference to libraries using <code>log</code> since the logging API
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remains the same. However executables will need to use the <code>set_logger_raw</code>
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function to initialize a logger and the <code>shutdown_logger_raw</code> function to
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shut down the global logger before exiting:</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">init</span>() <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>(), <span class="ident">SetLoggerError</span><span class="op">></span> {
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<span class="kw">unsafe</span> {
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<span class="ident">log</span>::<span class="ident">set_logger_raw</span>(<span class="op">|</span><span class="ident">max_log_level</span><span class="op">|</span> {
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<span class="kw">static</span> <span class="ident">LOGGER</span>: <span class="ident">SimpleLogger</span> <span class="op">=</span> <span class="ident">SimpleLogger</span>;
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<span class="ident">max_log_level</span>.<span class="ident">set</span>(<span class="ident">LogLevelFilter</span>::<span class="ident">Info</span>);
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<span class="kw-2">&</span><span class="ident">SimpleLogger</span>
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})
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}
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}
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<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">shutdown</span>() <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>(), <span class="ident">ShutdownLoggerError</span><span class="op">></span> {
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<span class="ident">log</span>::<span class="ident">shutdown_logger_raw</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">logger</span><span class="op">|</span> {
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<span class="kw">let</span> <span class="ident">logger</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="kw-2">&</span><span class="kw-2">*</span>(<span class="ident">logger</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">SimpleLogger</span>) };
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<span class="ident">logger</span>.<span class="ident">flush</span>();
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})
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}</pre>
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</div><h2 id='macros' class='section-header'><a href="#macros">Macros</a></h2>
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<table>
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<tr class=' module-item'>
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<td><a class="macro" href="macro.debug.html"
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title='macro log::debug'>debug</a></td>
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<td class='docblock-short'>
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<p>Logs a message at the debug level.</p>
|
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|||
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</td>
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|
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</tr>
|
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|
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<tr class=' module-item'>
|
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<td><a class="macro" href="macro.error.html"
|
|||
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title='macro log::error'>error</a></td>
|
|||
|
|
<td class='docblock-short'>
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|||
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<p>Logs a message at the error level.</p>
|
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|
|
|
|||
|
|
</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr class=' module-item'>
|
|||
|
|
<td><a class="macro" href="macro.info.html"
|
|||
|
|
title='macro log::info'>info</a></td>
|
|||
|
|
<td class='docblock-short'>
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|||
|
|
<p>Logs a message at the info level.</p>
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|
|
|
|||
|
|
</td>
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|
|
</tr>
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|||
|
|
<tr class=' module-item'>
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|
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<td><a class="macro" href="macro.log.html"
|
|||
|
|
title='macro log::log'>log</a></td>
|
|||
|
|
<td class='docblock-short'>
|
|||
|
|
<p>The standard logging macro.</p>
|
|||
|
|
|
|||
|
|
</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr class=' module-item'>
|
|||
|
|
<td><a class="macro" href="macro.log_enabled.html"
|
|||
|
|
title='macro log::log_enabled'>log_enabled</a></td>
|
|||
|
|
<td class='docblock-short'>
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|||
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|
<p>Determines if a message logged at the specified level in that module will
|
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be logged.</p>
|
|||
|
|
|
|||
|
|
</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr class=' module-item'>
|
|||
|
|
<td><a class="macro" href="macro.trace.html"
|
|||
|
|
title='macro log::trace'>trace</a></td>
|
|||
|
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<td class='docblock-short'>
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|||
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<p>Logs a message at the trace level.</p>
|
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|
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|||
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</td>
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|||
|
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</tr>
|
|||
|
|
<tr class=' module-item'>
|
|||
|
|
<td><a class="macro" href="macro.warn.html"
|
|||
|
|
title='macro log::warn'>warn</a></td>
|
|||
|
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<td class='docblock-short'>
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|||
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<p>Logs a message at the warn level.</p>
|
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</td>
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|||
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</tr></table><h2 id='structs' class='section-header'><a href="#structs">Structs</a></h2>
|
|||
|
|
<table>
|
|||
|
|
<tr class=' module-item'>
|
|||
|
|
<td><a class="struct" href="struct.LogLocation.html"
|
|||
|
|
title='struct log::LogLocation'>LogLocation</a></td>
|
|||
|
|
<td class='docblock-short'>
|
|||
|
|
<p>The location of a log message.</p>
|
|||
|
|
|
|||
|
|
</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr class=' module-item'>
|
|||
|
|
<td><a class="struct" href="struct.LogMetadata.html"
|
|||
|
|
title='struct log::LogMetadata'>LogMetadata</a></td>
|
|||
|
|
<td class='docblock-short'>
|
|||
|
|
<p>Metadata about a log message.</p>
|
|||
|
|
|
|||
|
|
</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr class=' module-item'>
|
|||
|
|
<td><a class="struct" href="struct.LogRecord.html"
|
|||
|
|
title='struct log::LogRecord'>LogRecord</a></td>
|
|||
|
|
<td class='docblock-short'>
|
|||
|
|
<p>The "payload" of a log message.</p>
|
|||
|
|
|
|||
|
|
</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr class=' module-item'>
|
|||
|
|
<td><a class="struct" href="struct.MaxLogLevelFilter.html"
|
|||
|
|
title='struct log::MaxLogLevelFilter'>MaxLogLevelFilter</a></td>
|
|||
|
|
<td class='docblock-short'>
|
|||
|
|
<p>A token providing read and write access to the global maximum log level
|
|||
|
|
filter.</p>
|
|||
|
|
|
|||
|
|
</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr class=' module-item'>
|
|||
|
|
<td><a class="struct" href="struct.SetLoggerError.html"
|
|||
|
|
title='struct log::SetLoggerError'>SetLoggerError</a></td>
|
|||
|
|
<td class='docblock-short'>
|
|||
|
|
<p>The type returned by <code>set_logger</code> if <code>set_logger</code> has already been called.</p>
|
|||
|
|
|
|||
|
|
</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr class=' module-item'>
|
|||
|
|
<td><a class="struct" href="struct.ShutdownLoggerError.html"
|
|||
|
|
title='struct log::ShutdownLoggerError'>ShutdownLoggerError</a></td>
|
|||
|
|
<td class='docblock-short'>
|
|||
|
|
<p>The type returned by <code>shutdown_logger_raw</code> if <code>shutdown_logger_raw</code> has
|
|||
|
|
already been called or if <code>set_logger_raw</code> has not been called yet.</p>
|
|||
|
|
|
|||
|
|
</td>
|
|||
|
|
</tr></table><h2 id='enums' class='section-header'><a href="#enums">Enums</a></h2>
|
|||
|
|
<table>
|
|||
|
|
<tr class=' module-item'>
|
|||
|
|
<td><a class="enum" href="enum.LogLevel.html"
|
|||
|
|
title='enum log::LogLevel'>LogLevel</a></td>
|
|||
|
|
<td class='docblock-short'>
|
|||
|
|
<p>An enum representing the available verbosity levels of the logging framework</p>
|
|||
|
|
|
|||
|
|
</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr class=' module-item'>
|
|||
|
|
<td><a class="enum" href="enum.LogLevelFilter.html"
|
|||
|
|
title='enum log::LogLevelFilter'>LogLevelFilter</a></td>
|
|||
|
|
<td class='docblock-short'>
|
|||
|
|
<p>An enum representing the available verbosity level filters of the logging
|
|||
|
|
framework.</p>
|
|||
|
|
|
|||
|
|
</td>
|
|||
|
|
</tr></table><h2 id='traits' class='section-header'><a href="#traits">Traits</a></h2>
|
|||
|
|
<table>
|
|||
|
|
<tr class=' module-item'>
|
|||
|
|
<td><a class="trait" href="trait.Log.html"
|
|||
|
|
title='trait log::Log'>Log</a></td>
|
|||
|
|
<td class='docblock-short'>
|
|||
|
|
<p>A trait encapsulating the operations required of a logger</p>
|
|||
|
|
|
|||
|
|
</td>
|
|||
|
|
</tr></table><h2 id='functions' class='section-header'><a href="#functions">Functions</a></h2>
|
|||
|
|
<table>
|
|||
|
|
<tr class=' module-item'>
|
|||
|
|
<td><a class="fn" href="fn.max_log_level.html"
|
|||
|
|
title='fn log::max_log_level'>max_log_level</a></td>
|
|||
|
|
<td class='docblock-short'>
|
|||
|
|
<p>Returns the current maximum log level.</p>
|
|||
|
|
|
|||
|
|
</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr class=' module-item'>
|
|||
|
|
<td><a class="fn" href="fn.set_logger.html"
|
|||
|
|
title='fn log::set_logger'>set_logger</a></td>
|
|||
|
|
<td class='docblock-short'>
|
|||
|
|
<p>Sets the global logger.</p>
|
|||
|
|
|
|||
|
|
</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr class=' module-item'>
|
|||
|
|
<td><a class="fn" href="fn.set_logger_raw.html"
|
|||
|
|
title='fn log::set_logger_raw'>set_logger_raw</a><a title='unsafe function' href='#'><sup>⚠</sup></a></td>
|
|||
|
|
<td class='docblock-short'>
|
|||
|
|
<p>Sets the global logger from a raw pointer.</p>
|
|||
|
|
|
|||
|
|
</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr class=' module-item'>
|
|||
|
|
<td><a class="fn" href="fn.shutdown_logger.html"
|
|||
|
|
title='fn log::shutdown_logger'>shutdown_logger</a></td>
|
|||
|
|
<td class='docblock-short'>
|
|||
|
|
<p>Shuts down the global logger.</p>
|
|||
|
|
|
|||
|
|
</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr class=' module-item'>
|
|||
|
|
<td><a class="fn" href="fn.shutdown_logger_raw.html"
|
|||
|
|
title='fn log::shutdown_logger_raw'>shutdown_logger_raw</a></td>
|
|||
|
|
<td class='docblock-short'>
|
|||
|
|
<p>Shuts down the global logger.</p>
|
|||
|
|
|
|||
|
|
</td>
|
|||
|
|
</tr></table></section>
|
|||
|
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<section id='search' class="content hidden"></section>
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<section class="footer"></section>
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<aside id="help" class="hidden">
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<div>
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<h1 class="hidden">Help</h1>
|
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|
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<div class="shortcuts">
|
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<h2>Keyboard Shortcuts</h2>
|
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<dl>
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<dt><kbd>?</kbd></dt>
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<dd>Show this help dialog</dd>
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<dt><kbd>S</kbd></dt>
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<dd>Focus the search field</dd>
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<dt><kbd>↑</kbd></dt>
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<dd>Move down in search results</dd>
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<dt><kbd>↹</kbd></dt>
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<dd>Switch tab</dd>
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<dt><kbd>⏎</kbd></dt>
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<dd>Go to active search result</dd>
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<dt><kbd>+</kbd></dt>
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<dd>Expand all sections</dd>
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<dt><kbd>-</kbd></dt>
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<dd>Collapse all sections</dd>
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</dl>
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</div>
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|
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<div class="infos">
|
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|
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<h2>Search Tricks</h2>
|
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|
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|
|||
|
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<p>
|
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|
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Prefix searches with a type followed by a colon (e.g.
|
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|
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<code>fn:</code>) to restrict the search to a given type.
|
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</p>
|
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|
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|
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<p>
|
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|
|
Accepted types are: <code>fn</code>, <code>mod</code>,
|
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|
|
<code>struct</code>, <code>enum</code>,
|
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|
|
<code>trait</code>, <code>type</code>, <code>macro</code>,
|
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|
|
and <code>const</code>.
|
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|
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</p>
|
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|
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|
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|
|
<p>
|
|||
|
|
Search functions by type signature (e.g.
|
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|
|
<code>vec -> usize</code> or <code>* -> vec</code>)
|
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|
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</p>
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|
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</div>
|
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|
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</div>
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|
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</aside>
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<script>
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window.rootPath = "../";
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<script src="../main.js"></script>
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