Vishesh 'ironeagle' Bangotra
7aadae1736
Enables dagpipe wiki on the docs hub alongside lib and mcp, removes stale nested lib pages, and picks up regenerated GSDFC docstrings in the MCP bundle.
1246 lines
35 KiB
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1246 lines
35 KiB
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Use Cases
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Best Practices
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Testing
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Basic Linear Pipeline
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|
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<span class="md-ellipsis">
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State & Data
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State & Data
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Schema and Payload
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State Fork and Lineage
|
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</span>
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Async Execution
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Step-wise Execution
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Best Practices
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Error Handling
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Error Handling
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<ul class="md-nav__list" data-md-component="toc" data-md-scrollfix>
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<li class="md-nav__item">
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📋 Exception reference
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🧊 Schema failures
|
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</a>
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</li>
|
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|
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<li class="md-nav__item">
|
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<a href="#cycle-failures" class="md-nav__link">
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🔁 Cycle failures
|
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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="#bad-node-output" class="md-nav__link">
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<span class="md-ellipsis">
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🧬 Bad node output
|
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</span>
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</a>
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</li>
|
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|
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<li class="md-nav__item">
|
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<a href="#step-wise-status-not-errors" class="md-nav__link">
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<span class="md-ellipsis">
|
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🪜 Step-wise status, not errors
|
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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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💡 Handling strategies
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📚 Read Next
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<a href="../07_testing_example/" class="md-nav__link">
|
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<span class="md-ellipsis">
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Testing
|
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</span>
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<div class="md-content" data-md-component="content">
|
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<article class="md-content__inner md-typeset">
|
||
|
||
|
||
|
||
|
||
|
||
<h1 id="error-handling">⚠️ Error Handling</h1>
|
||
<p>dagpipe raises a small, predictable set of exceptions. Know when they surface
|
||
and how to react.</p>
|
||
<hr />
|
||
<h2 id="exception-reference">📋 Exception reference</h2>
|
||
<table>
|
||
<thead>
|
||
<tr>
|
||
<th>Exception</th>
|
||
<th>Raised when</th>
|
||
<th>Where</th>
|
||
</tr>
|
||
</thead>
|
||
<tbody>
|
||
<tr>
|
||
<td><code>SchemaError</code></td>
|
||
<td>Payload violates the declared schema</td>
|
||
<td><code>State.__post_init__</code>, <code>Schema.validate_payload</code>, <code>Schema.validate_update</code>, <code>Schema._walk</code>, <code>Schema._check_type</code>, <code>Schema._validate_path</code></td>
|
||
</tr>
|
||
<tr>
|
||
<td><code>TypeError</code></td>
|
||
<td><code>resolve()</code>/<code>resolve_async()</code> yields a non-<code>State</code></td>
|
||
<td><code>Node.run</code>, <code>AsyncNode.run_async</code></td>
|
||
</tr>
|
||
<tr>
|
||
<td><code>TypeError</code></td>
|
||
<td><code>Engine(...)</code> receives a non-<code>Node</code> element or a non-<code>Sequence</code>/<code>Graph</code></td>
|
||
<td><code>Engine.__init__</code></td>
|
||
</tr>
|
||
<tr>
|
||
<td><code>TypeError</code></td>
|
||
<td><code>Engine.run</code>/<code>run_async</code> receives a non-<code>State</code> root</td>
|
||
<td><code>Engine.run</code>, <code>Engine.run_async</code></td>
|
||
</tr>
|
||
<tr>
|
||
<td><code>TypeError</code></td>
|
||
<td><code>Graph.add_edge</code>/<code>add_root</code> receives a non-<code>Node</code></td>
|
||
<td><code>Graph.add_edge</code>, <code>Graph.add_root</code></td>
|
||
</tr>
|
||
<tr>
|
||
<td><code>TypeError</code></td>
|
||
<td>A YAML node class path is not a <code>Node</code> subclass</td>
|
||
<td><code>_load_nodes</code></td>
|
||
</tr>
|
||
<tr>
|
||
<td><code>ValueError</code></td>
|
||
<td>Adding an edge would create a cycle (incl. self-cycle)</td>
|
||
<td><code>Graph.add_edge</code></td>
|
||
</tr>
|
||
<tr>
|
||
<td><code>ValueError</code></td>
|
||
<td><code>Node.id</code> is not valid dotted snake_case</td>
|
||
<td><code>Node.clean_id_and_name</code></td>
|
||
</tr>
|
||
<tr>
|
||
<td><code>RuntimeError</code></td>
|
||
<td>Engine mode is corrupt (should never happen)</td>
|
||
<td><code>Engine.run</code></td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
<hr />
|
||
<h2 id="schema-failures">🧊 Schema failures</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>
|
||
<span class="normal"><a href="#__codelineno-0-2">2</a></span>
|
||
<span class="normal"><a href="#__codelineno-0-3">3</a></span>
|
||
<span class="normal"><a href="#__codelineno-0-4">4</a></span>
|
||
<span class="normal"><a href="#__codelineno-0-5">5</a></span>
|
||
<span class="normal"><a href="#__codelineno-0-6">6</a></span>
|
||
<span class="normal"><a href="#__codelineno-0-7">7</a></span>
|
||
<span class="normal"><a href="#__codelineno-0-8">8</a></span>
|
||
<span class="normal"><a href="#__codelineno-0-9">9</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="kn">from</span><span class="w"> </span><span class="nn">dagpipe</span><span class="w"> </span><span class="kn">import</span> <span class="n">Payload</span><span class="p">,</span> <span class="n">Schema</span><span class="p">,</span> <span class="n">SchemaError</span><span class="p">,</span> <span class="n">State</span>
|
||
</span><span id="__span-0-2"><a id="__codelineno-0-2" name="__codelineno-0-2"></a>
|
||
</span><span id="__span-0-3"><a id="__codelineno-0-3" name="__codelineno-0-3"></a><span class="k">class</span><span class="w"> </span><span class="nc">UserState</span><span class="p">(</span><span class="n">State</span><span class="p">):</span>
|
||
</span><span id="__span-0-4"><a id="__codelineno-0-4" name="__codelineno-0-4"></a> <span class="n">schema</span> <span class="o">=</span> <span class="n">Schema</span><span class="p">({</span><span class="s2">"name"</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span> <span class="s2">"zip"</span><span class="p">:</span> <span class="nb">int</span> <span class="o">|</span> <span class="kc">None</span><span class="p">})</span>
|
||
</span><span id="__span-0-5"><a id="__codelineno-0-5" name="__codelineno-0-5"></a>
|
||
</span><span id="__span-0-6"><a id="__codelineno-0-6" name="__codelineno-0-6"></a><span class="k">try</span><span class="p">:</span>
|
||
</span><span id="__span-0-7"><a id="__codelineno-0-7" name="__codelineno-0-7"></a> <span class="n">UserState</span><span class="p">(</span><span class="n">payload</span><span class="o">=</span><span class="n">Payload</span><span class="p">({</span><span class="s2">"name"</span><span class="p">:</span> <span class="mi">42</span><span class="p">,</span> <span class="s2">"zip"</span><span class="p">:</span> <span class="s2">"abc"</span><span class="p">}))</span>
|
||
</span><span id="__span-0-8"><a id="__codelineno-0-8" name="__codelineno-0-8"></a><span class="k">except</span> <span class="n">SchemaError</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
|
||
</span><span id="__span-0-9"><a id="__codelineno-0-9" name="__codelineno-0-9"></a> <span class="nb">print</span><span class="p">(</span><span class="n">e</span><span class="p">)</span> <span class="c1"># Path 'name' must be str</span>
|
||
</span></code></pre></div></td></tr></table></div>
|
||
<p>Guidance:</p>
|
||
<ul>
|
||
<li>A <code>SchemaError</code> during construction means <strong>the root can never exist</strong> —
|
||
fail the request/concept early.</li>
|
||
<li><code>SchemaError</code> during <code>fork(payload_update=...)</code> means the update path was
|
||
<strong>not declared</strong> — fix the schema or the update, don't swallow it.</li>
|
||
</ul>
|
||
<hr />
|
||
<h2 id="cycle-failures">🔁 Cycle failures</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-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>
|
||
<span class="normal"><a href="#__codelineno-1-8">8</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="kn">from</span><span class="w"> </span><span class="nn">dagpipe</span><span class="w"> </span><span class="kn">import</span> <span class="n">Graph</span>
|
||
</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2"></a>
|
||
</span><span id="__span-1-3"><a id="__codelineno-1-3" name="__codelineno-1-3"></a><span class="n">g</span> <span class="o">=</span> <span class="n">Graph</span><span class="p">()</span>
|
||
</span><span id="__span-1-4"><a id="__codelineno-1-4" name="__codelineno-1-4"></a><span class="n">g</span><span class="o">.</span><span class="n">add_edge</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="p">)</span>
|
||
</span><span id="__span-1-5"><a id="__codelineno-1-5" name="__codelineno-1-5"></a><span class="k">try</span><span class="p">:</span>
|
||
</span><span id="__span-1-6"><a id="__codelineno-1-6" name="__codelineno-1-6"></a> <span class="n">g</span><span class="o">.</span><span class="n">add_edge</span><span class="p">(</span><span class="n">b</span><span class="p">,</span> <span class="n">a</span><span class="p">)</span> <span class="c1"># would create a cycle</span>
|
||
</span><span id="__span-1-7"><a id="__codelineno-1-7" name="__codelineno-1-7"></a><span class="k">except</span> <span class="ne">ValueError</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
|
||
</span><span id="__span-1-8"><a id="__codelineno-1-8" name="__codelineno-1-8"></a> <span class="nb">print</span><span class="p">(</span><span class="n">e</span><span class="p">)</span> <span class="c1"># Adding edge b → a would create cycle</span>
|
||
</span></code></pre></div></td></tr></table></div>
|
||
<p>Cycles (including <code>a → a</code>) always raise immediately at wiring time, never at
|
||
execution. Treat them as a design error: redraw the topology.</p>
|
||
<hr />
|
||
<h2 id="bad-node-output">🧬 Bad node output</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-2-1"> 1</a></span>
|
||
<span class="normal"><a href="#__codelineno-2-2"> 2</a></span>
|
||
<span class="normal"><a href="#__codelineno-2-3"> 3</a></span>
|
||
<span class="normal"><a href="#__codelineno-2-4"> 4</a></span>
|
||
<span class="normal"><a href="#__codelineno-2-5"> 5</a></span>
|
||
<span class="normal"><a href="#__codelineno-2-6"> 6</a></span>
|
||
<span class="normal"><a href="#__codelineno-2-7"> 7</a></span>
|
||
<span class="normal"><a href="#__codelineno-2-8"> 8</a></span>
|
||
<span class="normal"><a href="#__codelineno-2-9"> 9</a></span>
|
||
<span class="normal"><a href="#__codelineno-2-10">10</a></span>
|
||
<span class="normal"><a href="#__codelineno-2-11">11</a></span></pre></div></td><td class="code"><div><pre><span></span><code><span id="__span-2-1"><a id="__codelineno-2-1" name="__codelineno-2-1"></a><span class="k">class</span><span class="w"> </span><span class="nc">BadNode</span><span class="p">(</span><span class="n">Node</span><span class="p">):</span>
|
||
</span><span id="__span-2-2"><a id="__codelineno-2-2" name="__codelineno-2-2"></a> <span class="nb">id</span> <span class="o">=</span> <span class="s2">"bad.output"</span>
|
||
</span><span id="__span-2-3"><a id="__codelineno-2-3" name="__codelineno-2-3"></a>
|
||
</span><span id="__span-2-4"><a id="__codelineno-2-4" name="__codelineno-2-4"></a> <span class="k">def</span><span class="w"> </span><span class="nf">resolve</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">state</span><span class="p">):</span>
|
||
</span><span id="__span-2-5"><a id="__codelineno-2-5" name="__codelineno-2-5"></a> <span class="k">yield</span> <span class="s2">"not a state"</span> <span class="c1"># ← not a State</span>
|
||
</span><span id="__span-2-6"><a id="__codelineno-2-6" name="__codelineno-2-6"></a>
|
||
</span><span id="__span-2-7"><a id="__codelineno-2-7" name="__codelineno-2-7"></a><span class="n">engine</span> <span class="o">=</span> <span class="n">Engine</span><span class="p">([</span><span class="n">BadNode</span><span class="p">()])</span>
|
||
</span><span id="__span-2-8"><a id="__codelineno-2-8" name="__codelineno-2-8"></a><span class="k">try</span><span class="p">:</span>
|
||
</span><span id="__span-2-9"><a id="__codelineno-2-9" name="__codelineno-2-9"></a> <span class="n">engine</span><span class="o">.</span><span class="n">run</span><span class="p">(</span><span class="n">root</span><span class="p">)</span>
|
||
</span><span id="__span-2-10"><a id="__codelineno-2-10" name="__codelineno-2-10"></a><span class="k">except</span> <span class="ne">TypeError</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
|
||
</span><span id="__span-2-11"><a id="__codelineno-2-11" name="__codelineno-2-11"></a> <span class="nb">print</span><span class="p">(</span><span class="n">e</span><span class="p">)</span> <span class="c1"># bad.output.resolve must yield State, got <class 'str'></span>
|
||
</span></code></pre></div></td></tr></table></div>
|
||
<p>This check is applied per yielded object, so <strong>one bad element</strong> in a generator
|
||
fails the whole <code>run</code>.</p>
|
||
<hr />
|
||
<h2 id="step-wise-status-not-errors">🪜 Step-wise status, not errors</h2>
|
||
<p><code>run_steps</code> doesn't raise when a node produces no output — it reports
|
||
<code>completed=False</code>:</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-3-1">1</a></span>
|
||
<span class="normal"><a href="#__codelineno-3-2">2</a></span>
|
||
<span class="normal"><a href="#__codelineno-3-3">3</a></span></pre></div></td><td class="code"><div><pre><span></span><code><span id="__span-3-1"><a id="__codelineno-3-1" name="__codelineno-3-1"></a><span class="k">for</span> <span class="n">step</span> <span class="ow">in</span> <span class="n">engine</span><span class="o">.</span><span class="n">run_steps</span><span class="p">(</span><span class="n">root</span><span class="p">):</span>
|
||
</span><span id="__span-3-2"><a id="__codelineno-3-2" name="__codelineno-3-2"></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">step</span><span class="o">.</span><span class="n">completed</span><span class="p">:</span>
|
||
</span><span id="__span-3-3"><a id="__codelineno-3-3" name="__codelineno-3-3"></a> <span class="n">log</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s2">"</span><span class="si">%s</span><span class="s2"> produced no state (branch pruned)"</span><span class="p">,</span> <span class="n">step</span><span class="o">.</span><span class="n">node_id</span><span class="p">)</span>
|
||
</span></code></pre></div></td></tr></table></div>
|
||
<p>Treat <code>completed=False</code> as a signal, not an exception. See
|
||
<a href="../03_use_cases/07_step_execution/">use case 07</a>.</p>
|
||
<hr />
|
||
<h2 id="handling-strategies">💡 Handling strategies</h2>
|
||
<ul>
|
||
<li><strong>At the boundary:</strong> construct states/pipelines in a wrapper that converts
|
||
<code>SchemaError</code> into a user-facing <code>4xx</code> (API) or a descriptive <code>FAILED</code>
|
||
status (batch jobs).</li>
|
||
<li><strong>At the graph:</strong> let <code>ValueError</code> from <code>add_edge</code> propagate during setup —
|
||
it's a programming error you want to see in CI.</li>
|
||
<li><strong>Never</strong> catch <code>State</code>/<code>Payload</code> errors mid-pipeline and continue with a
|
||
fallback payload — the pipeline was designed to enforce invariants.</li>
|
||
</ul>
|
||
<hr />
|
||
<h2 id="read-next">📚 Read Next</h2>
|
||
<ul>
|
||
<li><a href="../04_best_practices/">Best Practices</a> — design rules that avoid these errors.</li>
|
||
<li><a href="../03_use_cases/04_schema_and_payload/">04 – Schema and payload</a> — validation details.</li>
|
||
<li><a href="../07_testing_example/">07 – Testing example</a> — asserting on error paths.</li>
|
||
</ul>
|
||
|
||
|
||
|
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