<!DOCTYPE html><htmllang="en"><head><metacharset="utf-8"><metaname="viewport"content="width=device-width, initial-scale=1.0"><metaname="generator"content="rustdoc"><metaname="description"content="Extends log `Event`s to provide complete `Metadata`."><title>NormalizeEvent in tracing_log - Rust</title><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><linkrel="stylesheet"href="../static.files/normalize-76eba96aa4d2e634.css"><linkrel="stylesheet"href="../static.files/rustdoc-5bc39a1768837dd0.css"><metaname="rustdoc-vars"data-root-path="../"data-static-root-path="../static.files/"data-current-crate="tracing_log"data-themes=""data-resource-suffix=""data-rustdoc-version="1.77.1 (7cf61ebde 2024-03-27)"data-channel="1.77.1"data-search-js="search-dd67cee4cfa65049.js"data-settings-js="settings-4313503d2e1961c2.js"><scriptsrc="../static.files/storage-4c98445ec4002617.js"></script><scriptdefersrc="sidebar-items.js"></script><scriptdefersrc="../static.files/main-48f368f3872407c8.js"></script><noscript><linkrel="stylesheet"href="../static.files/noscript-04d5337699b92874.css"></noscript><linkrel="alternate icon"type="image/png"href="../static.files/favicon-16x16-8b506e7a72182f1c.png"><linkrel="alternate icon"type="image/png"href="../static.files/favicon-32x32-422f7d1d52889060.png"><linkrel="icon"type="image/svg+xml"href="../static.files/favicon-2c020d218678b618.svg"></head><bodyclass="rustdoc trait"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><navclass="mobile-topbar"><buttonclass="sidebar-menu-toggle"title="show sidebar"></button><aclass="logo-container"href="../tracing_log/index.html"><imgsrc="https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png"alt=""></a></nav><navclass="sidebar"><divclass="sidebar-crate"><aclass="logo-container"href="../tracing_log/index.html"><imgsrc="https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png"alt="logo"></a><h2><ahref="../tracing_log/index.html">tracing_log</a><spanclass="version">0.2.0</span></h2></div><h2class="location"><ahref="#">NormalizeEvent</a></h2><divclass="sidebar-elems"><section><h3><ahref="#required-methods">Required Methods</a></h3><ulclass="block"><li><ahref="#tymethod.is_log">is_log</a></li><li><ahref="#tymethod.normalized_metadata">normalized_metadata</a></li></ul><h3><ahref="#foreign-impls">Implementations on Foreign Types</a></h3><ulclass="block"><li><ahref="#impl-NormalizeEvent%3C'a%3E-for-Event%3C'a%3E">Event<'a></a></li></ul><h3><ahref="#implementors">Implementors</a></h3></section><h2><ahref="index.html">In crate tracing_log</a></h2></div></nav><divclass="sidebar-resizer"></div>
<main><divclass="width-limiter"><navclass="sub"><formclass="search-form"><span></span><divid="sidebar-button"tabindex="-1"><ahref="../tracing_log/all.html"title="show sidebar"></a></div><inputclass="search-input"name="search"aria-label="Run search in the documentation"autocomplete="off"spellcheck="false"placeholder="Click or press ‘S’ to search, ‘?’ for more options…"type="search"><divid="help-button"tabindex="-1"><ahref="../help.html"title="help">?</a></div><divid="settings-menu"tabindex="-1"><ahref="../settings.html"title="settings"><imgwidth="22"height="22"alt="Change settings"src="../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><sectionid="main-content"class="content"><divclass="main-heading"><h1>Trait <ahref="index.html">tracing_log</a>::<wbr><aclass="trait"href="#">NormalizeEvent</a><buttonid="copy-path"title="Copy item path to clipboard"><imgsrc="../static.files/clipboard-7571035ce49a181d.svg"width="19"height="18"alt="Copy item path"></button></h1><spanclass="out-of-band"><aclass="src"href="../src/tracing_log/lib.rs.html#455-464">source</a> · <buttonid="toggle-all-docs"title="collapse all docs">[<span>−</span>]</button></span></div><preclass="rust item-decl"><code>pub trait NormalizeEvent<'a>: Sealed {
}</code></pre><detailsclass="toggle top-doc"open><summaryclass="hideme"><span>Expand description</span></summary><divclass="docblock"><p>Extends log <code>Event</code>s to provide complete <code>Metadata</code>.</p>
<p>In <code>tracing-log</code>, an <code>Event</code> produced by a log (through <ahref="trait.AsTrace.html"title="trait tracing_log::AsTrace"><code>AsTrace</code></a>) has an hard coded
“log” target and no <code>file</code>, <code>line</code>, or <code>module_path</code> attributes. This happens because <code>Event</code>
requires its <code>Metadata</code> to be <code>'static</code>, while <ahref="../log/struct.Record.html"title="struct log::Record"><code>log::Record</code></a>s provide them with a generic
lifetime.</p>
<p>However, these values are stored in the <code>Event</code>’s fields and
the <ahref="trait.NormalizeEvent.html#normalized_metadata"title="trait tracing_log::NormalizeEvent"><code>normalized_metadata</code></a> method allows to build a new <code>Metadata</code>
that only lives as long as its source <code>Event</code>, but provides complete
data.</p>
<p>It can typically be used by <code>Subscriber</code>s when processing an <code>Event</code>,
to allow accessing its complete metadata in a consistent way,
</div></details><h2id="required-methods"class="section-header">Required Methods<ahref="#required-methods"class="anchor">§</a></h2><divclass="methods"><detailsclass="toggle method-toggle"open><summary><sectionid="tymethod.normalized_metadata"class="method"><aclass="src rightside"href="../src/tracing_log/lib.rs.html#461">source</a><h4class="code-header">fn <ahref="#tymethod.normalized_metadata"class="fn">normalized_metadata</a>(&'a self) -><aclass="enum"href="https://doc.rust-lang.org/1.77.1/core/option/enum.Option.html"title="enum core::option::Option">Option</a><<aclass="struct"href="../tracing_core/metadata/struct.Metadata.html"title="struct tracing_core::metadata::Metadata">Metadata</a><'a>></h4></section></summary><divclass="docblock"><p>If this <code>Event</code> comes from a <code>log</code>, this method provides a new
</div></details><detailsclass="toggle method-toggle"open><summary><sectionid="tymethod.is_log"class="method"><aclass="src rightside"href="../src/tracing_log/lib.rs.html#463">source</a><h4class="code-header">fn <ahref="#tymethod.is_log"class="fn">is_log</a>(&self) -><aclass="primitive"href="https://doc.rust-lang.org/1.77.1/std/primitive.bool.html">bool</a></h4></section></summary><divclass="docblock"><p>Returns whether this <code>Event</code> represents a log (from the <code>log</code> crate)</p>
