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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="Extension trait allowing futures to be instrumented with a `tracing` `Subscriber`."><title>WithSubscriber in tracing::instrument - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../static.files/rustdoc-ac92e1bbe349e143.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="tracing" data-themes="" data-resource-suffix="" data-rustdoc-version="1.76.0 (07dca489a 2024-02-04)" data-channel="1.76.0" data-search-js="search-2b6ce74ff89ae146.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../../static.files/storage-f2adc0d6ca4d09fb.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../static.files/main-305769736d49e732.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-feafe1bb7466e4bd.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-16x16-8b506e7a72182f1c.png"><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc trait"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">☰</button><a class="logo-container" href="../../tracing/index.html"><img src="https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png" alt=""></a></nav><nav class="sidebar"><div class="sidebar-crate"><a class="logo-container" href="../../tracing/index.html"><img src="https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png" alt="logo"></a><h2><a href="../../tracing/index.html">tracing</a><span class="version">0.1.40</span></h2></div><h2 class="location"><a href="#">WithSubscriber</a></h2><div class="sidebar-elems"><section><h3><a href="#provided-methods">Provided Methods</a></h3><ul class="block"><li><a href="#method.with_current_subscriber">with_current_subscriber</a></li><li><a href="#method.with_subscriber">with_subscriber</a></li></ul><h3><a href="#object-safety">Object Safety</a></h3><h3><a href="#implementors">Implementors</a></h3></section><h2><a href="index.html">In tracing::instrument</a></h2></div></nav><div class="sidebar-resizer"></div>
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<main><div class="width-limiter"><nav class="sub"><form class="search-form"><span></span><div id="sidebar-button" tabindex="-1"><a href="../../tracing/all.html" title="show sidebar"></a></div><input class="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"><div id="help-button" tabindex="-1"><a href="../../help.html" title="help">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1>Trait <a href="../index.html">tracing</a>::<wbr><a href="index.html">instrument</a>::<wbr><a class="trait" href="#">WithSubscriber</a><button id="copy-path" title="Copy item path to clipboard"><img src="../../static.files/clipboard-7571035ce49a181d.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="src" href="../../src/tracing/instrument.rs.html#136-234">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>−</span>]</button></span></div><pre class="rust item-decl"><code>pub trait WithSubscriber: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> {
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// Provided methods
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fn <a href="#method.with_subscriber" class="fn">with_subscriber</a><S>(self, subscriber: S) -> <a class="struct" href="struct.WithDispatch.html" title="struct tracing::instrument::WithDispatch">WithDispatch</a><Self> <a href="#" class="tooltip" data-notable-ty="WithDispatch<Self>">ⓘ</a>
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<span class="where">where S: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><<a class="struct" href="../struct.Dispatch.html" title="struct tracing::Dispatch">Dispatch</a>></span> { ... }
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<span class="item-spacer"></span> fn <a href="#method.with_current_subscriber" class="fn">with_current_subscriber</a>(self) -> <a class="struct" href="struct.WithDispatch.html" title="struct tracing::instrument::WithDispatch">WithDispatch</a><Self> <a href="#" class="tooltip" data-notable-ty="WithDispatch<Self>">ⓘ</a> { ... }
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}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Extension trait allowing futures to be instrumented with
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a <code>tracing</code> <a href="../trait.Subscriber.html" title="trait tracing::Subscriber"><code>Subscriber</code></a>.</p>
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</div></details><h2 id="provided-methods" class="section-header">Provided Methods<a href="#provided-methods" class="anchor">§</a></h2><div class="methods"><details class="toggle method-toggle" open><summary><section id="method.with_subscriber" class="method"><a class="src rightside" href="../../src/tracing/instrument.rs.html#176-184">source</a><h4 class="code-header">fn <a href="#method.with_subscriber" class="fn">with_subscriber</a><S>(self, subscriber: S) -> <a class="struct" href="struct.WithDispatch.html" title="struct tracing::instrument::WithDispatch">WithDispatch</a><Self> <a href="#" class="tooltip" data-notable-ty="WithDispatch<Self>">ⓘ</a><div class="where">where
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S: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><<a class="struct" href="../struct.Dispatch.html" title="struct tracing::Dispatch">Dispatch</a>>,</div></h4></section></summary><div class="docblock"><p>Attaches the provided <a href="../trait.Subscriber.html" title="trait tracing::Subscriber"><code>Subscriber</code></a> to this type, returning a
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<a href="struct.WithDispatch.html" title="struct tracing::instrument::WithDispatch"><code>WithDispatch</code></a> wrapper.</p>
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<p>The attached <a href="../trait.Subscriber.html" title="trait tracing::Subscriber"><code>Subscriber</code></a> will be set as the <a href="../dispatcher/index.html#setting-the-default-subscriber" title="mod tracing::dispatcher">default</a> when the returned
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<a href="https://doc.rust-lang.org/1.76.0/core/future/future/trait.Future.html" title="trait core::future::future::Future"><code>Future</code></a> is polled.</p>
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<h5 id="examples"><a href="#examples">Examples</a></h5>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>tracing::instrument::WithSubscriber;
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<span class="comment">// Set the default `Subscriber`
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</span><span class="kw">let </span>_default = tracing::subscriber::set_default(MySubscriber::default());
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<span class="macro">tracing::info!</span>(<span class="string">"this event will be recorded by the default `Subscriber`"</span>);
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<span class="comment">// Create a different `Subscriber` and attach it to a future.
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</span><span class="kw">let </span>other_subscriber = MyOtherSubscriber::default();
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<span class="kw">let </span>future = <span class="kw">async </span>{
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<span class="macro">tracing::info!</span>(<span class="string">"this event will be recorded by the other `Subscriber`"</span>);
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<span class="comment">// ...
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</span>};
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future
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<span class="comment">// Attach the other `Subscriber` to the future before awaiting it
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</span>.with_subscriber(other_subscriber)
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.<span class="kw">await</span>;
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<span class="comment">// Once the future has completed, we return to the default `Subscriber`.
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</span><span class="macro">tracing::info!</span>(<span class="string">"this event will be recorded by the default `Subscriber`"</span>);</code></pre></div>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.with_current_subscriber" class="method"><a class="src rightside" href="../../src/tracing/instrument.rs.html#228-233">source</a><h4 class="code-header">fn <a href="#method.with_current_subscriber" class="fn">with_current_subscriber</a>(self) -> <a class="struct" href="struct.WithDispatch.html" title="struct tracing::instrument::WithDispatch">WithDispatch</a><Self> <a href="#" class="tooltip" data-notable-ty="WithDispatch<Self>">ⓘ</a></h4></section></summary><div class="docblock"><p>Attaches the current <a href="../dispatcher/index.html#setting-the-default-subscriber" title="mod tracing::dispatcher">default</a> <a href="../trait.Subscriber.html" title="trait tracing::Subscriber"><code>Subscriber</code></a> to this type, returning a
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<a href="struct.WithDispatch.html" title="struct tracing::instrument::WithDispatch"><code>WithDispatch</code></a> wrapper.</p>
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<p>The attached <code>Subscriber</code> will be set as the <a href="../dispatcher/index.html#setting-the-default-subscriber" title="mod tracing::dispatcher">default</a> when the returned
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<a href="https://doc.rust-lang.org/1.76.0/core/future/future/trait.Future.html" title="trait core::future::future::Future"><code>Future</code></a> is polled.</p>
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<p>This can be used to propagate the current dispatcher context when
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spawning a new future that may run on a different thread.</p>
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<h5 id="examples-1"><a href="#examples-1">Examples</a></h5>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>tracing::instrument::WithSubscriber;
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<span class="comment">// Using `set_default` (rather than `set_global_default`) sets the
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// default `Subscriber` for *this* thread only.
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</span><span class="kw">let </span>_default = tracing::subscriber::set_default(MySubscriber::default());
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<span class="kw">let </span>future = <span class="kw">async </span>{
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<span class="comment">// ...
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</span>};
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<span class="comment">// If a multi-threaded async runtime is in use, this spawned task may
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// run on a different thread, in a different default `Subscriber`'s context.
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</span>tokio::spawn(future);
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<span class="comment">// However, calling `with_current_subscriber` on the future before
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// spawning it, ensures that the current thread's default `Subscriber` is
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// propagated to the spawned task, regardless of where it executes:
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</span>tokio::spawn(future.with_current_subscriber());</code></pre></div>
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</div></details></div><h2 id="object-safety" class="section-header">Object Safety<a href="#object-safety" class="anchor">§</a></h2><div class="object-safety-info">This trait is <b>not</b> <a href="https://doc.rust-lang.org/1.76.0/reference/items/traits.html#object-safety">object safe</a>.</div><h2 id="implementors" class="section-header">Implementors<a href="#implementors" class="anchor">§</a></h2><div id="implementors-list"><section id="impl-WithSubscriber-for-T" class="impl"><a class="src rightside" href="../../src/tracing/instrument.rs.html#393">source</a><a href="#impl-WithSubscriber-for-T" class="anchor">§</a><h3 class="code-header">impl<T: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>> <a class="trait" href="trait.WithSubscriber.html" title="trait tracing::instrument::WithSubscriber">WithSubscriber</a> for T</h3></section></div><script src="../../trait.impl/tracing/instrument/trait.WithSubscriber.js" async></script><script type="text/json" id="notable-traits-data">{"WithDispatch<Self>":"<h3>Notable traits for <code><a class=\"struct\" href=\"struct.WithDispatch.html\" title=\"struct tracing::instrument::WithDispatch\">WithDispatch</a><T></code></h3><pre><code><div class=\"where\">impl<T: <a class=\"trait\" href=\"https://doc.rust-lang.org/1.76.0/core/future/future/trait.Future.html\" title=\"trait core::future::future::Future\">Future</a>> <a class=\"trait\" href=\"https://doc.rust-lang.org/1.76.0/core/future/future/trait.Future.html\" title=\"trait core::future::future::Future\">Future</a> for <a class=\"struct\" href=\"struct.WithDispatch.html\" title=\"struct tracing::instrument::WithDispatch\">WithDispatch</a><T></div><div class=\"where\"> type <a href=\"https://doc.rust-lang.org/1.76.0/core/future/future/trait.Future.html#associatedtype.Output\" class=\"associatedtype\">Output</a> = T::<a class=\"associatedtype\" href=\"https://doc.rust-lang.org/1.76.0/core/future/future/trait.Future.html#associatedtype.Output\" title=\"type core::future::future::Future::Output\">Output</a>;</div>"}</script></section></div></main></body></html>
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