Vishesh 'ironeagle' Bangotra
a32eeaf2b4
- collect.py copies each repo's built site contents directly to a top-level <repo>/ dir (was libs|apis|wiki/<repo>/site nesting) - nginx uses `index index.html lib/index.html api/index.html` so /dagpipe/ -> lib/index.html, /auth-server/ -> api/index.html are served internally with no redirects - _index regenerates links against the flat layout (/dagpipe/lib/, /auth-server/api/, /mongo-ops/, /blog/...) - config.yml static entries point at vendored blog/ + media-manager/ - Dockerfile copies per-repo dirs flat into the nginx html root - removed stale libs/, apis/, wiki/, tutorials/ category trees
1170 lines
27 KiB
HTML
1170 lines
27 KiB
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Cache Lifecycle
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Overview
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Core Components
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Best Practices
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Common Patterns
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Error Handling
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Testing Example
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Overview
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Core Components
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02 components
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Use Cases
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Basic CRUD
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Custom Repo
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Transactions
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Pagination
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Multi Model
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<h1 id="use-case-11-proper-cache-lifecycle-in-fastapi">Use Case 11: Proper Cache Lifecycle in FastAPI</h1>
|
||
<p><strong>Scenario:</strong>
|
||
A microservice uses <code>InMemoryCacheBackend</code> (or Redis) and needs to start the cache cleanup task when the app starts, then shut it down cleanly on termination.</p>
|
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<hr />
|
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<h2 id="whats-new">📦 What’s New?</h2>
|
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<table>
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<thead>
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|
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<th>Component</th>
|
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<th>Description</th>
|
||
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|
||
</thead>
|
||
<tbody>
|
||
<tr>
|
||
<td><code>ModelRegistry.initialize_cache()</code></td>
|
||
<td>Starts the async background task for the registered cache backend.</td>
|
||
</tr>
|
||
<tr>
|
||
<td><code>ModelRegistry.shutdown_cache()</code></td>
|
||
<td>Gracefully stops the background task and releases resources.</td>
|
||
</tr>
|
||
<tr>
|
||
<td>FastAPI lifespan integration</td>
|
||
<td>Demonstrates where to call both init and shutdown methods.</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
<hr />
|
||
<h2 id="example">🚀 Example</h2>
|
||
<div class="language-python highlight"><span class="filename">Python</span><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="kn">from</span><span class="w"> </span><span class="nn">mongo_ops</span><span class="w"> </span><span class="kn">import</span> <span class="n">MongoConnectionManager</span><span class="p">,</span> <span class="n">ModelRegistry</span>
|
||
<a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a><span class="kn">from</span><span class="w"> </span><span class="nn">mongo_ops.cache</span><span class="w"> </span><span class="kn">import</span> <span class="n">InMemoryCacheBackend</span>
|
||
<a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a><span class="kn">from</span><span class="w"> </span><span class="nn">contextlib</span><span class="w"> </span><span class="kn">import</span> <span class="n">asynccontextmanager</span>
|
||
<a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a>
|
||
<a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a><span class="c1"># Initialise a cache backend (in‑memory example)</span>
|
||
<a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a><span class="n">cache</span> <span class="o">=</span> <span class="n">InMemoryCacheBackend</span><span class="p">(</span><span class="n">max_entries</span><span class="o">=</span><span class="mi">10_000</span><span class="p">,</span> <span class="n">default_ttl</span><span class="o">=</span><span class="mi">300</span><span class="p">)</span>
|
||
<a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a><span class="n">ModelRegistry</span><span class="o">.</span><span class="n">set_cache_backend</span><span class="p">(</span><span class="n">cache</span><span class="p">)</span>
|
||
<a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a>
|
||
<a id="__codelineno-0-9" name="__codelineno-0-9" href="#__codelineno-0-9"></a><span class="nd">@asynccontextmanager</span>
|
||
<a id="__codelineno-0-10" name="__codelineno-0-10" href="#__codelineno-0-10"></a><span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">lifespan</span><span class="p">(</span><span class="n">app</span><span class="p">):</span>
|
||
<a id="__codelineno-0-11" name="__codelineno-0-11" href="#__codelineno-0-11"></a> <span class="c1"># Start MongoDB connection and cache background task</span>
|
||
<a id="__codelineno-0-12" name="__codelineno-0-12" href="#__codelineno-0-12"></a> <span class="k">async</span> <span class="k">with</span> <span class="n">MongoConnectionManager</span><span class="o">.</span><span class="n">lifespan</span><span class="p">(</span>
|
||
<a id="__codelineno-0-13" name="__codelineno-0-13" href="#__codelineno-0-13"></a> <span class="n">uri</span><span class="o">=</span><span class="s2">"mongodb://localhost:27017"</span><span class="p">,</span>
|
||
<a id="__codelineno-0-14" name="__codelineno-0-14" href="#__codelineno-0-14"></a> <span class="n">db_name</span><span class="o">=</span><span class="s2">"mydb"</span><span class="p">,</span>
|
||
<a id="__codelineno-0-15" name="__codelineno-0-15" href="#__codelineno-0-15"></a> <span class="p">):</span>
|
||
<a id="__codelineno-0-16" name="__codelineno-0-16" href="#__codelineno-0-16"></a> <span class="k">await</span> <span class="n">ModelRegistry</span><span class="o">.</span><span class="n">initialize_all</span><span class="p">()</span> <span class="c1"># create indexes</span>
|
||
<a id="__codelineno-0-17" name="__codelineno-0-17" href="#__codelineno-0-17"></a> <span class="k">await</span> <span class="n">ModelRegistry</span><span class="o">.</span><span class="n">initialize_cache</span><span class="p">()</span> <span class="c1"># start cache cleanup</span>
|
||
<a id="__codelineno-0-18" name="__codelineno-0-18" href="#__codelineno-0-18"></a> <span class="k">yield</span>
|
||
<a id="__codelineno-0-19" name="__codelineno-0-19" href="#__codelineno-0-19"></a> <span class="c1"># FastAPI will exit the `with` block here – clean up cache</span>
|
||
<a id="__codelineno-0-20" name="__codelineno-0-20" href="#__codelineno-0-20"></a> <span class="k">await</span> <span class="n">ModelRegistry</span><span class="o">.</span><span class="n">shutdown_cache</span><span class="p">()</span>
|
||
</code></pre></div>
|
||
<h3 id="why-a-separate-shutdown-step">Why a separate shutdown step?</h3>
|
||
<ul>
|
||
<li>The cache backend may spawn an <code>asyncio.Task</code> that periodically removes expired entries. If the task is left dangling, the event loop may complain about pending tasks on shutdown.</li>
|
||
<li><code>shutdown_cache()</code> cancels the internal task and waits for it to finish, ensuring a clean exit.</li>
|
||
</ul>
|
||
<hr />
|
||
<h2 id="tips">💡 Tips</h2>
|
||
<ul>
|
||
<li>Register the cache <strong>before</strong> calling <code>initialize_cache()</code>; otherwise the registry won’t know which backend to start.</li>
|
||
<li>For Redis backends, the shutdown step also closes the underlying <code>redis.asyncio.Redis</code> client connection.</li>
|
||
<li>You can also hook the shutdown into a FastAPI <code>@app.on_event("shutdown")</code> handler if you prefer not to use the lifespan context manager.</li>
|
||
</ul>
|
||
<hr />
|
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