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Vishesh 'ironeagle' Bangotra 406affcfcf feat: renumber lib reference into 4-pillar anatomy
Renumber the 15 reference docs into pillar groups (recipe -> anatomy):
- 01 Build Recipe (entry), 02 Composition Root
- domains: 10 Layering Rules
- contract: 20 Spec-First Routing, 21 CRUD Template, 22 Auth Integration
- interfaces/infra: 30 Infra Adapters
- UI: 40 UI: Auto-Rendered Admin & Custom Pages (new; @aetoskia packages,
  client template, x- catalog via react-openapi MCP module)
- pipelines: 50 Pipeline Scaffold, 51 Worker & Progress, 52 Human-in-the-Loop
- delivery/meta: 90 Drone Pipelines, 91 Versioning & Changelog,
  92 Genericity Matrix, 93 Library Registry, 94 Repository Inventory

MCP module names are unchanged (NN_ prefix stripped); all cross-references
(wiki, templates, hooks, registry) updated; lib index rewritten pillar-first;
build recipe bootstraps the client template. Bundle + HTML sites regenerated.
2026-10-19 17:42:55 +05:30

835 lines
30 KiB
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<h1 id="composition-root">Composition Root</h1>
<h2 id="summary">Summary</h2>
<p>All wiring happens in exactly one module. It builds a <strong>flat resource
registry</strong> and exposes it to the HTTP layer and to scripts.</p>
<hr />
<h2 id="the-resource-registry">The resource registry</h2>
<p><code>init.py</code> returns a plain <code>dict[str, Any]</code>. Keys follow two conventions:</p>
<ul>
<li><code>&lt;resource&gt;_repo</code> — a repository adapter for a resource.</li>
<li><code>&lt;resource&gt;_svc</code> — a service for a resource.</li>
</ul>
<p>Plus named infrastructure adaptors:</p>
<ul>
<li><code>http_cache_store</code> — response cache backend.</li>
<li><code>progress_bus</code> — progress/event bus.</li>
<li><code>&lt;vendor&gt;_&lt;kind&gt;</code> — fetchers, clients, stores.</li>
</ul>
<p>The API stores the dict on <code>app.state.db_resources</code> during lifespan startup.
Handlers read from it; nothing imports concrete adapters.</p>
<h2 id="shape">Shape</h2>
<div class="language-python highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-0-1"> 1</a></span>
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<span class="normal"><a href="#__codelineno-0-34">34</a></span>
<span class="normal"><a href="#__codelineno-0-35">35</a></span></pre></div></td><td class="code"><div><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1"></a><span class="n">_resources</span><span class="p">:</span> <span class="nb">dict</span> <span class="o">=</span> <span class="p">{}</span>
</span><span id="__span-0-2"><a id="__codelineno-0-2" name="__codelineno-0-2"></a><span class="n">_initialized</span> <span class="o">=</span> <span class="kc">False</span>
</span><span id="__span-0-3"><a id="__codelineno-0-3" name="__codelineno-0-3"></a>
</span><span id="__span-0-4"><a id="__codelineno-0-4" name="__codelineno-0-4"></a><span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">init</span><span class="p">(</span><span class="n">settings</span><span class="o">=</span><span class="kc">None</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="nb">dict</span><span class="p">:</span>
</span><span id="__span-0-5"><a id="__codelineno-0-5" name="__codelineno-0-5"></a> <span class="k">global</span> <span class="n">_initialized</span>
</span><span id="__span-0-6"><a id="__codelineno-0-6" name="__codelineno-0-6"></a> <span class="k">if</span> <span class="n">_initialized</span><span class="p">:</span>
</span><span id="__span-0-7"><a id="__codelineno-0-7" name="__codelineno-0-7"></a> <span class="k">return</span> <span class="n">_resources</span>
</span><span id="__span-0-8"><a id="__codelineno-0-8" name="__codelineno-0-8"></a>
</span><span id="__span-0-9"><a id="__codelineno-0-9" name="__codelineno-0-9"></a> <span class="k">await</span> <span class="n">setup_database</span><span class="p">(</span><span class="n">uri</span><span class="o">=</span><span class="n">settings</span><span class="o">.</span><span class="n">mongo_uri</span><span class="p">,</span> <span class="n">db_name</span><span class="o">=</span><span class="n">settings</span><span class="o">.</span><span class="n">mongo_db</span><span class="p">)</span>
</span><span id="__span-0-10"><a id="__codelineno-0-10" name="__codelineno-0-10"></a>
</span><span id="__span-0-11"><a id="__codelineno-0-11" name="__codelineno-0-11"></a> <span class="c1"># 1. leaf repositories</span>
</span><span id="__span-0-12"><a id="__codelineno-0-12" name="__codelineno-0-12"></a> <span class="n">user_repo</span> <span class="o">=</span> <span class="n">create_user_repo</span><span class="p">()</span>
</span><span id="__span-0-13"><a id="__codelineno-0-13" name="__codelineno-0-13"></a>
</span><span id="__span-0-14"><a id="__codelineno-0-14" name="__codelineno-0-14"></a> <span class="c1"># 2. dependent repositories (dependencies passed by keyword)</span>
</span><span id="__span-0-15"><a id="__codelineno-0-15" name="__codelineno-0-15"></a> <span class="n">wallet_repo</span> <span class="o">=</span> <span class="n">create_wallet_repo</span><span class="p">(</span><span class="n">user_repo</span><span class="o">=</span><span class="n">user_repo</span><span class="p">)</span>
</span><span id="__span-0-16"><a id="__codelineno-0-16" name="__codelineno-0-16"></a>
</span><span id="__span-0-17"><a id="__codelineno-0-17" name="__codelineno-0-17"></a> <span class="c1"># 3. services (build via the DI library, injecting the repo)</span>
</span><span id="__span-0-18"><a id="__codelineno-0-18" name="__codelineno-0-18"></a> <span class="n">_resources</span><span class="p">[</span><span class="s2">&quot;user_repo&quot;</span><span class="p">]</span> <span class="o">=</span> <span class="n">user_repo</span>
</span><span id="__span-0-19"><a id="__codelineno-0-19" name="__codelineno-0-19"></a> <span class="n">_resources</span><span class="p">[</span><span class="s2">&quot;wallet_repo&quot;</span><span class="p">]</span> <span class="o">=</span> <span class="n">wallet_repo</span>
</span><span id="__span-0-20"><a id="__codelineno-0-20" name="__codelineno-0-20"></a> <span class="n">_resources</span><span class="p">[</span><span class="s2">&quot;user_svc&quot;</span><span class="p">]</span> <span class="o">=</span> <span class="n">get_user_service</span><span class="p">(</span><span class="n">user_repo</span><span class="p">)</span>
</span><span id="__span-0-21"><a id="__codelineno-0-21" name="__codelineno-0-21"></a> <span class="n">_resources</span><span class="p">[</span><span class="s2">&quot;wallet_svc&quot;</span><span class="p">]</span> <span class="o">=</span> <span class="n">get_wallet_service</span><span class="p">(</span><span class="n">wallet_repo</span><span class="p">)</span>
</span><span id="__span-0-22"><a id="__codelineno-0-22" name="__codelineno-0-22"></a>
</span><span id="__span-0-23"><a id="__codelineno-0-23" name="__codelineno-0-23"></a> <span class="c1"># 4. infrastructure adaptors (optional)</span>
</span><span id="__span-0-24"><a id="__codelineno-0-24" name="__codelineno-0-24"></a> <span class="n">_resources</span><span class="p">[</span><span class="s2">&quot;http_cache_store&quot;</span><span class="p">]</span> <span class="o">=</span> <span class="n">HttpCacheStore</span><span class="p">(</span><span class="o">...</span><span class="p">)</span>
</span><span id="__span-0-25"><a id="__codelineno-0-25" name="__codelineno-0-25"></a> <span class="n">_resources</span><span class="p">[</span><span class="s2">&quot;progress_bus&quot;</span><span class="p">]</span> <span class="o">=</span> <span class="n">ProgressEventBus</span><span class="p">()</span>
</span><span id="__span-0-26"><a id="__codelineno-0-26" name="__codelineno-0-26"></a>
</span><span id="__span-0-27"><a id="__codelineno-0-27" name="__codelineno-0-27"></a> <span class="n">_initialized</span> <span class="o">=</span> <span class="kc">True</span>
</span><span id="__span-0-28"><a id="__codelineno-0-28" name="__codelineno-0-28"></a> <span class="k">return</span> <span class="n">_resources</span>
</span><span id="__span-0-29"><a id="__codelineno-0-29" name="__codelineno-0-29"></a>
</span><span id="__span-0-30"><a id="__codelineno-0-30" name="__codelineno-0-30"></a><span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">shutdown</span><span class="p">()</span> <span class="o">-&gt;</span> <span class="kc">None</span><span class="p">:</span>
</span><span id="__span-0-31"><a id="__codelineno-0-31" name="__codelineno-0-31"></a> <span class="k">global</span> <span class="n">_initialized</span>
</span><span id="__span-0-32"><a id="__codelineno-0-32" name="__codelineno-0-32"></a> <span class="k">await</span> <span class="n">close_stores</span><span class="p">(</span><span class="n">_resources</span><span class="p">)</span>
</span><span id="__span-0-33"><a id="__codelineno-0-33" name="__codelineno-0-33"></a> <span class="k">await</span> <span class="n">shutdown_database</span><span class="p">()</span>
</span><span id="__span-0-34"><a id="__codelineno-0-34" name="__codelineno-0-34"></a> <span class="n">_resources</span><span class="o">.</span><span class="n">clear</span><span class="p">()</span>
</span><span id="__span-0-35"><a id="__codelineno-0-35" name="__codelineno-0-35"></a> <span class="n">_initialized</span> <span class="o">=</span> <span class="kc">False</span>
</span></code></pre></div></td></tr></table></div>
<h2 id="typed-accessors">Typed accessors</h2>
<p>Expose a <code>get_svc(name)</code> helper with one <code>@overload</code> per key so scripts get
typing without importing concrete classes:</p>
<div class="language-python highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-1-1">1</a></span>
<span class="normal"><a href="#__codelineno-1-2">2</a></span>
<span class="normal"><a href="#__codelineno-1-3">3</a></span>
<span class="normal"><a href="#__codelineno-1-4">4</a></span>
<span class="normal"><a href="#__codelineno-1-5">5</a></span>
<span class="normal"><a href="#__codelineno-1-6">6</a></span>
<span class="normal"><a href="#__codelineno-1-7">7</a></span></pre></div></td><td class="code"><div><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1"></a><span class="nd">@overload</span>
</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2"></a><span class="k">def</span><span class="w"> </span><span class="nf">get_svc</span><span class="p">(</span><span class="n">name</span><span class="p">:</span> <span class="n">Literal</span><span class="p">[</span><span class="s2">&quot;user_svc&quot;</span><span class="p">])</span> <span class="o">-&gt;</span> <span class="n">UserService</span><span class="p">:</span> <span class="o">...</span>
</span><span id="__span-1-3"><a id="__codelineno-1-3" name="__codelineno-1-3"></a><span class="nd">@overload</span>
</span><span id="__span-1-4"><a id="__codelineno-1-4" name="__codelineno-1-4"></a><span class="k">def</span><span class="w"> </span><span class="nf">get_svc</span><span class="p">(</span><span class="n">name</span><span class="p">:</span> <span class="n">Literal</span><span class="p">[</span><span class="s2">&quot;wallet_svc&quot;</span><span class="p">])</span> <span class="o">-&gt;</span> <span class="n">WalletService</span><span class="p">:</span> <span class="o">...</span>
</span><span id="__span-1-5"><a id="__codelineno-1-5" name="__codelineno-1-5"></a>
</span><span id="__span-1-6"><a id="__codelineno-1-6" name="__codelineno-1-6"></a><span class="k">def</span><span class="w"> </span><span class="nf">get_svc</span><span class="p">(</span><span class="n">name</span><span class="p">:</span> <span class="nb">str</span><span class="p">):</span>
</span><span id="__span-1-7"><a id="__codelineno-1-7" name="__codelineno-1-7"></a> <span class="k">return</span> <span class="n">_resources</span><span class="p">[</span><span class="n">name</span><span class="p">]</span>
</span></code></pre></div></td></tr></table></div>
<p>Also expose <code>get_db()</code> (raw database handle) and pure helpers such as
<code>compute_fingerprint(payload)</code> (canonical hash used for deduplication).</p>
<h2 id="rules">Rules</h2>
<ul>
<li><code>init()</code> is <strong>idempotent</strong>.</li>
<li>The composition root is the only place that imports concrete adapters.</li>
<li>Handlers never call <code>init()</code>; they read <code>request.app.state.db_resources</code>.</li>
<li>Scripts call <code>init()</code> / <code>shutdown()</code> around their work.</li>
</ul>
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