1126 lines
28 KiB
HTML
1126 lines
28 KiB
HTML
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<link rel="prev" href="../06_best_practices/">
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<meta name="generator" content="mkdocs-1.6.1, mkdocs-material-9.6.23">
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<title>Error Handling - Hexa Documentation</title>
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<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
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<a href="#error-handling" class="md-skip">
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Skip to content
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M10.25 2c.19 0 .36.11.44.26l2.22 3.96.09.28-.09.28-2.22 3.96c-.08.15-.25.26-.44.26h-4.5c-.19 0-.36-.11-.44-.26L3.09 6.78 3 6.5l.09-.28 2.22-3.96c.08-.15.25-.26.44-.26zm0 11c.19 0 .36.11.44.26l2.22 3.96.09.28-.09.28-2.22 3.96c-.08.15-.25.26-.44.26h-4.5c-.19 0-.36-.11-.44-.26l-2.22-3.96L3 17.5l.09-.28 2.22-3.96c.08-.15.25-.26.44-.26zm9.25-5.5c.19 0 .36.11.44.26l2.22 3.96.09.28-.09.28-2.22 3.96c-.08.15-.25.26-.44.26H15c-.19 0-.36-.11-.44-.26l-2.22-3.96-.09-.28.09-.28 2.22-3.96c.08-.15.25-.26.44-.26z"/></svg>
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Hexa Documentation
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<div class="md-header__topic" data-md-component="header-topic">
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<span class="md-ellipsis">
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Error Handling
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</span>
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</div>
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</div>
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</div>
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<label class="md-header__button md-icon" for="__search">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 6.52 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5"/></svg>
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<div class="md-search" data-md-component="search" role="dialog">
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<label class="md-search__overlay" for="__search"></label>
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<div class="md-search__inner" role="search">
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<form class="md-search__form" name="search">
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<input type="text" class="md-search__input" name="query" aria-label="Search" placeholder="Search" autocapitalize="off" autocorrect="off" autocomplete="off" spellcheck="false" data-md-component="search-query" required>
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<label class="md-search__icon md-icon" for="__search">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 6.52 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9.5 5"/></svg>
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<a href="javascript:void(0)" class="md-search__icon md-icon" title="Share" aria-label="Share" data-clipboard data-clipboard-text="" data-md-component="search-share" tabindex="-1">
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<div class="md-search-result" data-md-component="search-result">
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<div class="md-search-result__meta">
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Initializing search
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</div>
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<ol class="md-search-result__list" role="presentation"></ol>
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<li class="md-tabs__item">
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<a href=".." class="md-tabs__link">
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Home
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<li class="md-tabs__item">
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<a href="../01_overview/" class="md-tabs__link">
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Overview
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</a>
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</li>
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<li class="md-tabs__item">
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<a href="../02_components/" class="md-tabs__link">
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Core Components
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</a>
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</li>
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<li class="md-tabs__item">
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<a href="../03_use_cases/01_yaml_first/" class="md-tabs__link">
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Use Cases
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</a>
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</li>
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<li class="md-tabs__item">
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<a href="../04_design/" class="md-tabs__link">
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Design
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</a>
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</li>
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<li class="md-tabs__item">
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<a href="../05_philosophy/" class="md-tabs__link">
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Philosophy
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</a>
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</li>
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<li class="md-tabs__item">
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<a href="../06_best_practices/" class="md-tabs__link">
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Best Practices
|
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</a>
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</li>
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<li class="md-tabs__item md-tabs__item--active">
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<a href="./" class="md-tabs__link">
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Error Handling
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</a>
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||
</li>
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<li class="md-tabs__item">
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<a href="../08_testing_example/" class="md-tabs__link">
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Testing
|
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|
||
</a>
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</li>
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</ul>
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</div>
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</nav>
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<main class="md-main" data-md-component="main">
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<div class="md-main__inner md-grid">
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<div class="md-sidebar md-sidebar--primary" data-md-component="sidebar" data-md-type="navigation" >
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<div class="md-sidebar__scrollwrap">
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<div class="md-sidebar__inner">
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<nav class="md-nav md-nav--primary md-nav--lifted md-nav--integrated" aria-label="Navigation" data-md-level="0">
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<a href=".." title="Hexa Documentation" class="md-nav__button md-logo" aria-label="Hexa Documentation" data-md-component="logo">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M10.25 2c.19 0 .36.11.44.26l2.22 3.96.09.28-.09.28-2.22 3.96c-.08.15-.25.26-.44.26h-4.5c-.19 0-.36-.11-.44-.26L3.09 6.78 3 6.5l.09-.28 2.22-3.96c.08-.15.25-.26.44-.26zm0 11c.19 0 .36.11.44.26l2.22 3.96.09.28-.09.28-2.22 3.96c-.08.15-.25.26-.44.26h-4.5c-.19 0-.36-.11-.44-.26l-2.22-3.96L3 17.5l.09-.28 2.22-3.96c.08-.15.25-.26.44-.26zm9.25-5.5c.19 0 .36.11.44.26l2.22 3.96.09.28-.09.28-2.22 3.96c-.08.15-.25.26-.44.26H15c-.19 0-.36-.11-.44-.26l-2.22-3.96-.09-.28.09-.28 2.22-3.96c.08-.15.25-.26.44-.26z"/></svg>
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</a>
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Hexa Documentation
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</label>
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<ul class="md-nav__list" data-md-scrollfix>
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<li class="md-nav__item">
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<a href=".." class="md-nav__link">
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<span class="md-ellipsis">
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Home
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<li class="md-nav__item">
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<a href="../01_overview/" class="md-nav__link">
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<span class="md-ellipsis">
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Overview
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../02_components/" class="md-nav__link">
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<span class="md-ellipsis">
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Core Components
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</span>
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</a>
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</li>
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<li class="md-nav__item md-nav__item--nested">
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<input class="md-nav__toggle md-toggle md-toggle--indeterminate" type="checkbox" id="__nav_4" >
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<label class="md-nav__link" for="__nav_4" id="__nav_4_label" tabindex="0">
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<span class="md-ellipsis">
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Use Cases
|
||
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||
</span>
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<span class="md-nav__icon md-icon"></span>
|
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</label>
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<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_4_label" aria-expanded="false">
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<label class="md-nav__title" for="__nav_4">
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<span class="md-nav__icon md-icon"></span>
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Use Cases
|
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</label>
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<ul class="md-nav__list" data-md-scrollfix>
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<li class="md-nav__item md-nav__item--nested">
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<input class="md-nav__toggle md-toggle md-toggle--indeterminate" type="checkbox" id="__nav_4_1" >
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<label class="md-nav__link" for="__nav_4_1" id="__nav_4_1_label" tabindex="0">
|
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<span class="md-ellipsis">
|
||
Contract Authoring
|
||
|
||
</span>
|
||
|
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|
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<span class="md-nav__icon md-icon"></span>
|
||
</label>
|
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||
<nav class="md-nav" data-md-level="2" aria-labelledby="__nav_4_1_label" aria-expanded="false">
|
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<label class="md-nav__title" for="__nav_4_1">
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<span class="md-nav__icon md-icon"></span>
|
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Contract Authoring
|
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</label>
|
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<ul class="md-nav__list" data-md-scrollfix>
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<li class="md-nav__item">
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<a href="../03_use_cases/01_yaml_first/" class="md-nav__link">
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<span class="md-ellipsis">
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YAML First
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../03_use_cases/02_abc_first/" class="md-nav__link">
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<span class="md-ellipsis">
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ABC First
|
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</span>
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</a>
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</li>
|
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</ul>
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</nav>
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</li>
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Wiring & Runtime
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📝 YAML Structural Errors
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🤝 check_matches Mismatch Handling
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🧰 Library Contracts
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<article class="md-content__inner md-typeset">
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||
|
||
<h1 id="error-handling">Error Handling<a class="headerlink" href="#error-handling" title="Permanent link">¶</a></h1>
|
||
<p>Every failure mode in <code>hexa</code>, what triggers it, and how it surfaces — from the library (raises) and from the CLI (exits 1 with <code>Error: <message></code> on stderr).</p>
|
||
<hr />
|
||
<h2 id="failure-modes">📚 Failure Modes<a class="headerlink" href="#failure-modes" title="Permanent link">¶</a></h2>
|
||
<table>
|
||
<thead>
|
||
<tr>
|
||
<th>Where</th>
|
||
<th>Trigger</th>
|
||
<th>Outcome</th>
|
||
</tr>
|
||
</thead>
|
||
<tbody>
|
||
<tr>
|
||
<td><code>parse_yaml</code></td>
|
||
<td>Structural error in the YAML spec (bad class body, wrong scalar types)</td>
|
||
<td><code>ValueError</code> raised</td>
|
||
</tr>
|
||
<tr>
|
||
<td><code>check_matches</code></td>
|
||
<td>Path whose suffix is neither <code>.yaml</code>/<code>.yml</code> nor <code>.py</code></td>
|
||
<td><code>ValueError("Unknown file extension for <path>")</code></td>
|
||
</tr>
|
||
<tr>
|
||
<td><code>parse_abc</code></td>
|
||
<td>Module can't be located / root can't be detected</td>
|
||
<td>Raises (import or reflection error)</td>
|
||
</tr>
|
||
<tr>
|
||
<td><code>build</code></td>
|
||
<td>Annotated type can't be instantiated</td>
|
||
<td>Raises from the constructor path</td>
|
||
</tr>
|
||
<tr>
|
||
<td>CLI (any subcommand)</td>
|
||
<td>Any of the above</td>
|
||
<td>Prints <code>Error: <message></code> to stderr, exits <code>1</code></td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
<hr />
|
||
<h2 id="yaml-structural-errors">📝 YAML Structural Errors<a class="headerlink" href="#yaml-structural-errors" title="Permanent link">¶</a></h2>
|
||
<p><code>parse_yaml</code> performs <strong>structural validation only</strong> — it checks the shape of the spec, not the types at runtime. Malformed specs raise <code>ValueError</code> (typically LRU-line-scoped in the source). Common causes:</p>
|
||
<ul>
|
||
<li>A port body that isn't a mapping.</li>
|
||
<li>A nested struct that contains a value that's neither a scalar type expression nor a mapping body.</li>
|
||
<li>A <code>methods:</code> entry with an invalid shape (missing <code>args</code>/<code>kwargs</code>, wrong collection types).</li>
|
||
</ul>
|
||
<blockquote>
|
||
<p>The CLI wraps everything, so a bad spec shows as:
|
||
<div class="language-text highlight"><span class="filename">Text Only</span><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a>Error: <reason>
|
||
</code></pre></div>
|
||
Do not confuse "structural" with "runtime": a spec that names a class that doesn't exist at runtime is not a parse error — YAML specs are contract-only and carry no runtime import.</p>
|
||
</blockquote>
|
||
<hr />
|
||
<h2 id="check_matches-mismatch-handling">🤝 <code>check_matches</code> Mismatch Handling<a class="headerlink" href="#check_matches-mismatch-handling" title="Permanent link">¶</a></h2>
|
||
<p><code>check_matches</code> does <strong>not</strong> raise on disagreement — it returns a result:</p>
|
||
<table>
|
||
<thead>
|
||
<tr>
|
||
<th>Result</th>
|
||
<th>Meaning</th>
|
||
</tr>
|
||
</thead>
|
||
<tbody>
|
||
<tr>
|
||
<td><code>True</code></td>
|
||
<td>The two trees are equal.</td>
|
||
</tr>
|
||
<tr>
|
||
<td><code>list[str]</code></td>
|
||
<td>Human-readable difference strings (ported from <code>PortNode.diff</code>).</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
<p>The CLI renders differences and exits <code>1</code>:</p>
|
||
<div class="language-text highlight"><span class="filename">Text Only</span><pre><span></span><code><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a>Differences found:
|
||
<a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a> <slot> port_cls mismatch: baz vs foo
|
||
</code></pre></div>
|
||
<p>A list result is <em>truthy</em> in Python, so always compare with <code>is True</code>:</p>
|
||
<div class="language-python highlight"><span class="filename">Python</span><pre><span></span><code><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a><span class="n">res</span> <span class="o">=</span> <span class="n">check_matches</span><span class="p">(</span><span class="n">spec</span><span class="p">,</span> <span class="n">abc</span><span class="p">)</span>
|
||
<a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a><span class="k">if</span> <span class="n">res</span> <span class="ow">is</span> <span class="kc">True</span><span class="p">:</span>
|
||
<a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a> <span class="nb">print</span><span class="p">(</span><span class="s2">"clean"</span><span class="p">)</span>
|
||
<a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a><span class="k">else</span><span class="p">:</span>
|
||
<a id="__codelineno-2-5" name="__codelineno-2-5" href="#__codelineno-2-5"></a> <span class="nb">print</span><span class="p">(</span><span class="n">res</span><span class="p">)</span> <span class="c1"># iterable of diff strings</span>
|
||
</code></pre></div>
|
||
<hr />
|
||
<h2 id="library-contracts">🧰 Library Contracts<a class="headerlink" href="#library-contracts" title="Permanent link">¶</a></h2>
|
||
<ul>
|
||
<li><code>check_matches(path_a, path_b)</code> — exactly one YAML file and exactly one <code>.py</code> file, in either order. Any other extension raises <code>ValueError</code>.</li>
|
||
<li><code>parse_abc(x)</code> — accepts a <code>.py</code> path, an import string, or a loaded module. Give it a <strong>file path</strong>; other forms are for programmatic use.</li>
|
||
<li><code>parse_yaml(path)</code> — accepts <code>str | Path</code>.</li>
|
||
<li><code>build(cls, *, instances=None, config=None)</code> filters out non-dict config values and skips unclassified annotations (forward references, <code>Any</code>, etc.) — those are left unset rather than raised.</li>
|
||
</ul>
|
||
<hr />
|
||
<h2 id="tips">💡 Tips<a class="headerlink" href="#tips" title="Permanent link">¶</a></h2>
|
||
<ul>
|
||
<li>Keep <code>str</code>/<code>int</code>/<code>bool</code> scalar annotations out of port slots — they're treated as config fields, and <code>build</code> won't instantiate them as ports.</li>
|
||
<li><code>hexa check</code> is the friendliest failure reporter: never parse trees yourself when you can point two files at it.</li>
|
||
<li>Guard CI with <code>hexa check spec.yaml abc.py</code> so representation drift never ships silently.</li>
|
||
</ul>
|
||
<hr />
|
||
<h2 id="related">Related<a class="headerlink" href="#related" title="Permanent link">¶</a></h2>
|
||
<ul>
|
||
<li><a href="../02_components/">02 – Core Components</a> · <a href="../06_best_practices/">06 – Best Practices</a> · <a href="../08_testing_example/">08 – Testing</a></li>
|
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|
||
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