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22 lines
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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="What the server on the other end of the wire can actually do."><title>jellytau_lib::repository::capabilities - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../../static.files/rustdoc-17e0aaed.css"><meta name="rustdoc-vars" data-root-path="../../../" data-static-root-path="../../../static.files/" data-current-crate="jellytau_lib" data-themes="" data-resource-suffix="" data-rustdoc-version="1.97.1 (8bab26f4f 2026-07-14)" data-channel="1.97.1" data-search-js="search-fd9372ac.js" data-stringdex-js="stringdex-2da4960a.js" data-settings-js="settings-170eb4bf.js" ><script src="../../../static.files/storage-41dd4d93.js"></script><script defer src="../sidebar-items.js"></script><script defer src="../../../static.files/main-fcd733ba.js"></script><noscript><link rel="stylesheet" href="../../../static.files/noscript-f7c3ffd8.css"></noscript><link rel="alternate icon" type="image/png" href="../../../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../../../static.files/favicon-044be391.svg"></head><body class="rustdoc mod"><a class="skip-main-content" href="#main-content">Skip to main content</a><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><rustdoc-topbar><h2><a href="#">Module capabilities</a></h2></rustdoc-topbar><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../../jellytau_lib/index.html">jellytau_<wbr>lib</a><span class="version">0.11.6</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">Module capabilities</a></h2><h3><a href="#">Sections</a></h3><ul class="block top-toc"><li><a href="#why-flags-and-not-version-comparisons" title="Why flags and not version comparisons">Why flags and not version comparisons</a></li><li><a href="#why-an-unknown-version-resolves-forward" title="Why an unknown version resolves forward">Why an unknown version resolves forward</a></li></ul><h3><a href="#structs">Module Items</a></h3><ul class="block"><li><a href="#structs" title="Structs">Structs</a></li><li><a href="#enums" title="Enums">Enums</a></li><li><a href="#constants" title="Constants">Constants</a></li></ul></section><div id="rustdoc-modnav"><h2><a href="../index.html">In jellytau_<wbr>lib::<wbr>repository</a></h2></div></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><div class="width-limiter"><section id="main-content" class="content" tabindex="-1"><div class="main-heading"><div class="rustdoc-breadcrumbs"><a href="../../index.html">jellytau_lib</a>::<wbr><a href="../index.html">repository</a></div><h1>Module <span>capabilities</span> <button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../../../src/jellytau_lib/repository/capabilities.rs.html#1-416">Source</a> </span></div><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>What the server on the other end of the wire can actually do.</p>
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<p>One <code>ServerCapabilities</code> value is resolved per connection, from the version
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the server already reports at <code>/System/Info/Public</code>, and every decision that
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depends on the server generation reads a <strong>named flag</strong> from it.</p>
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<h2 id="why-flags-and-not-version-comparisons"><a class="doc-anchor" href="#why-flags-and-not-version-comparisons">§</a>Why flags and not version comparisons</h2>
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<p>A <code>version < N</code> written at the point of use re-derives a domain fact where it
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is consumed — the same error as a Jellyfin taxonomy in the frontend, and the
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reason <code>check:boundary</code> exists. It is also unreadable by its second
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occurrence (<code>< 11</code> says nothing about <em>what</em> changed), and it cannot express
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a backport, where a behaviour appears in a patch release of an older line.</p>
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<p>So the version → flags mapping lives in exactly one function
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(<a href="struct.ServerCapabilities.html#method.for_version" title="associated function jellytau_lib::repository::capabilities::ServerCapabilities::for_version"><code>ServerCapabilities::for_version</code></a>) and nothing else in the crate compares
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a version number.</p>
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<h2 id="why-an-unknown-version-resolves-forward"><a class="doc-anchor" href="#why-an-unknown-version-resolves-forward">§</a>Why an unknown version resolves forward</h2>
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<p>A server newer than this build resolves to the newest capability set we know
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rather than being refused. Refusing would make every JellyTau release expire
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the moment the server upgrades, which is the failure UR-085 exists to remove.
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Refusal is reserved for a version <em>below</em> <a href="constant.MINIMUM_SUPPORTED_MAJOR_MINOR.html" title="constant jellytau_lib::repository::capabilities::MINIMUM_SUPPORTED_MAJOR_MINOR"><code>MINIMUM_SUPPORTED_MAJOR_MINOR</code></a>,
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where failure is certain rather than merely likely.</p>
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<p>TRACES: UR-085 | IR-035, DR-280</p>
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</div></details><h2 id="structs" class="section-header">Structs<a href="#structs" class="anchor">§</a></h2><dl class="item-table"><dt><a class="struct" href="struct.ServerCapabilities.html" title="struct jellytau_lib::repository::capabilities::ServerCapabilities">Server<wbr>Capabilities</a></dt><dd>The resolved answer, carried by <code>OnlineRepository</code> for the life of a
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connection.</dd><dt><a class="struct" href="struct.ServerVersion.html" title="struct jellytau_lib::repository::capabilities::ServerVersion">Server<wbr>Version</a></dt><dd>A parsed server version.</dd></dl><h2 id="enums" class="section-header">Enums<a href="#enums" class="anchor">§</a></h2><dl class="item-table"><dt><a class="enum" href="enum.ServerGeneration.html" title="enum jellytau_lib::repository::capabilities::ServerGeneration">Server<wbr>Generation</a></dt><dd>How this build classified the server it is talking to.</dd></dl><h2 id="constants" class="section-header">Constants<a href="#constants" class="anchor">§</a></h2><dl class="item-table"><dt><a class="constant" href="constant.MINIMUM_SUPPORTED_MAJOR_MINOR.html" title="constant jellytau_lib::repository::capabilities::MINIMUM_SUPPORTED_MAJOR_MINOR">MINIMUM_<wbr>SUPPORTED_<wbr>MAJOR_<wbr>MINOR</a></dt><dd>The oldest server this build will talk to, as <code>(major, minor)</code>.</dd></dl></section></div></main></body></html> |