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.
1197 lines
26 KiB
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1197 lines
26 KiB
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Best Practices
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Core Components
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Use Cases
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Best Practices
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Error Handling
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Testing
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Core Components
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Basic Linear Pipeline
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Graph Execution
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Best Practices
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🧱 Node design
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🔀 Graph patterns
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⚡ Async guidance
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🪜 Step-wise guidance
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🧪 Testability
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❌ Anti-patterns
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📚 Read Next
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Error Handling
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</a>
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Testing
|
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<article class="md-content__inner md-typeset">
|
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|
||
|
||
|
||
|
||
|
||
<h1 id="best-practices">🧹 Best Practices</h1>
|
||
<p>Conventions adopted across dagpipe pipelines. Follow these to keep graphs
|
||
deterministic, observable, and debuggable.</p>
|
||
<hr />
|
||
<h2 id="node-design">🧱 Node design</h2>
|
||
<ul>
|
||
<li><strong>Keep nodes pure.</strong> A node must never mutate its input <code>State</code> — fork a new
|
||
one instead. Inputs are shared across branches, so mutation would corrupt
|
||
siblings.</li>
|
||
<li><strong>Yield zero states to prune.</strong> <code>return ()</code> in <code>resolve</code> kills the branch:
|
||
children never run and this path contributes no terminal state.</li>
|
||
<li><strong>One responsibility per node.</strong> Name nodes for what they do
|
||
(<code>entity.resolve_numeric_merchant</code>, <code>text.normalize</code>), mirroring their
|
||
<code>file.module</code> location.</li>
|
||
<li><strong>Prefer stateless subclasses.</strong> The singleton-per-subclass model means a
|
||
stateless node can be reused everywhere for free. Only declare <code>__init__</code>
|
||
when you need per-run dependencies (then inspect how instances are created —
|
||
custom <code>__init__</code> opts out of the singleton).</li>
|
||
<li><strong>Use <code>Node.fork</code> inside <code>resolve</code></strong> so the node ID is recorded in
|
||
<code>history</code> automatically.</li>
|
||
</ul>
|
||
<hr />
|
||
<h2 id="state-schema-design">🎯 State & schema design</h2>
|
||
<ul>
|
||
<li><strong>Validate as early as possible.</strong> A root <code>State</code> validates its payload in
|
||
<code>__post_init__</code> — construct roots inside a factory with a clear error path.</li>
|
||
<li><strong>Declare the schema once</strong> at the <code>Schema</code>-building layer and reuse it across
|
||
state subclasses and YAML definitions.</li>
|
||
<li><strong>Use <code>object</code> sparingly.</strong> Free-form <code>object</code> fields defeat validation. Prefer
|
||
explicit types or unions (<code>str | None</code>) wherever the contract is known.</li>
|
||
<li><strong>Evolve schemas deliberately.</strong> <code>fork()</code> updates are path-validated; adding a
|
||
new path is a breaking change for existing payloads.</li>
|
||
</ul>
|
||
<hr />
|
||
<h2 id="graph-patterns">🔀 Graph patterns</h2>
|
||
<ul>
|
||
<li><strong>Multiple roots are independent.</strong> They receive the same root state and share
|
||
nothing — don't expect cross-communication between roots.</li>
|
||
<li><strong>Merge = shared child.</strong> To join branches, point all of them at the same
|
||
node. The merge node runs once per incoming state.</li>
|
||
<li><strong>Prune early with guards.</strong> <code>if not state.get(...): return</code> in <code>resolve</code>
|
||
keeps downstream work minimal.</li>
|
||
<li><strong>Keep graphs acyclic by construction.</strong> Cycle detection exists, but a cycle
|
||
is always a design bug. Lay out your graph like a DAG from the start.</li>
|
||
<li><strong>Prefer programmatic <code>Graph</code> for dynamic topologies;</strong> use YAML only for
|
||
static pipelines you can diff in review.</li>
|
||
</ul>
|
||
<hr />
|
||
<h2 id="async-guidance">⚡ Async guidance</h2>
|
||
<ul>
|
||
<li>Mix sync and async nodes freely — dispatch is per node, not per engine.</li>
|
||
<li>Wrap per-node I/O in <code>AsyncNode.resolve_async</code>; keep the engine generic.</li>
|
||
<li>Don't <code>await run_async(...)</code> for all-sync graphs; <code>run</code> is cheaper.</li>
|
||
</ul>
|
||
<hr />
|
||
<h2 id="step-wise-guidance">🪜 Step-wise guidance</h2>
|
||
<ul>
|
||
<li><code>resume_from</code> is 0-based — persist <code>last_index + 1</code> and resume from it.</li>
|
||
<li>Treat <code>completed=False</code> as "no output", not "failure".</li>
|
||
<li>Route <code>ProgressMessage</code> through <code>on_step</code> hooks for tracing/progress bars
|
||
without coupling the engine.</li>
|
||
</ul>
|
||
<hr />
|
||
<h2 id="testability">🧪 Testability</h2>
|
||
<ul>
|
||
<li>Build synthetic <code>State</code> via a small factory (see the <code>make_state</code> fixture
|
||
pattern in <a href="../07_testing_example/">Testing</a>) — one call per scenario.</li>
|
||
<li>Assert on <strong>terminal states</strong> and their <code>history</code>, not intermediate prints.</li>
|
||
<li>For YAML pipelines, test with a tiny importable node module and a <code>tmp_path</code>
|
||
fixture (as the integration suite does), keeping tests offline.</li>
|
||
</ul>
|
||
<hr />
|
||
<h2 id="anti-patterns">❌ Anti-patterns</h2>
|
||
<table>
|
||
<thead>
|
||
<tr>
|
||
<th>Pattern</th>
|
||
<th>Why it's wrong</th>
|
||
</tr>
|
||
</thead>
|
||
<tbody>
|
||
<tr>
|
||
<td>Mutating <code>state.payload</code> or <code>state.metadata</code></td>
|
||
<td>Breaks immutability; shared across branches</td>
|
||
</tr>
|
||
<tr>
|
||
<td>Building nodes with heavy <code>__init__</code></td>
|
||
<td>Skips singleton reuse; couples pipeline to instance state</td>
|
||
</tr>
|
||
<tr>
|
||
<td>Logging inside <code>resolve</code></td>
|
||
<td>Hard to test; pollutes output. Use <code>on_step</code> hooks instead</td>
|
||
</tr>
|
||
<tr>
|
||
<td>Reusing one <code>Graph</code> across concurrent runs</td>
|
||
<td>Assumes nodes are stateless — they must be</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
<hr />
|
||
<h2 id="read-next">📚 Read Next</h2>
|
||
<ul>
|
||
<li><a href="../06_error_handling/">Error Handling</a> — the exceptions you'll actually see.</li>
|
||
<li><a href="../03_use_cases/07_step_execution/">07 – Step-wise execution</a> — resume & hooks.</li>
|
||
<li><a href="../07_testing_example/">07 – Testing example</a> — the fixture pattern.</li>
|
||
</ul>
|
||
|
||
|
||
|
||
|
||
|
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|
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|
||
|
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