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docs/dagpipe/wiki/03_use_cases/06_async_execution/index.html
Vishesh 'ironeagle' Bangotra 7aadae1736 feat: collect dagpipe wiki, refresh lib and mcp artifacts 
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.
2026-09-16 15:43:14 +05:30

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<h1 id="06-async-execution">06 – Async Execution</h1>
<p><code>AsyncNode</code> subclasses run I/O-bound steps (HTTP, DB, file reads) via
<code>Engine.run_async</code>. Sync and async nodes can be mixed in the same graph —
the engine dispatches each node to the right path automatically.</p>
<hr />
<h2 id="goal">🎯 Goal</h2>
<p>Fetch a document from a remote service, then run a synchronous post-processor.</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-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>
<span class="normal"><a href="#__codelineno-0-10">10</a></span>
<span class="normal"><a href="#__codelineno-0-11">11</a></span>
<span class="normal"><a href="#__codelineno-0-12">12</a></span>
<span class="normal"><a href="#__codelineno-0-13">13</a></span>
<span class="normal"><a href="#__codelineno-0-14">14</a></span>
<span class="normal"><a href="#__codelineno-0-15">15</a></span>
<span class="normal"><a href="#__codelineno-0-16">16</a></span>
<span class="normal"><a href="#__codelineno-0-17">17</a></span>
<span class="normal"><a href="#__codelineno-0-18">18</a></span>
<span class="normal"><a href="#__codelineno-0-19">19</a></span>
<span class="normal"><a href="#__codelineno-0-20">20</a></span>
<span class="normal"><a href="#__codelineno-0-21">21</a></span>
<span class="normal"><a href="#__codelineno-0-22">22</a></span>
<span class="normal"><a href="#__codelineno-0-23">23</a></span>
<span class="normal"><a href="#__codelineno-0-24">24</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">import</span><span class="w"> </span><span class="nn">asyncio</span>
</span><span id="__span-0-2"><a id="__codelineno-0-2" name="__codelineno-0-2"></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">AsyncNode</span><span class="p">,</span> <span class="n">Node</span><span class="p">,</span> <span class="n">Schema</span><span class="p">,</span> <span class="n">State</span><span class="p">,</span> <span class="n">Payload</span><span class="p">,</span> <span class="n">Graph</span><span class="p">,</span> <span class="n">Engine</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">class</span><span class="w"> </span><span class="nc">FetchDoc</span><span class="p">(</span><span class="n">AsyncNode</span><span class="p">):</span>
</span><span id="__span-0-5"><a id="__codelineno-0-5" name="__codelineno-0-5"></a> <span class="nb">id</span> <span class="o">=</span> <span class="s2">&quot;web.fetch&quot;</span>
</span><span id="__span-0-6"><a id="__codelineno-0-6" name="__codelineno-0-6"></a>
</span><span id="__span-0-7"><a id="__codelineno-0-7" name="__codelineno-0-7"></a> <span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">resolve_async</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">state</span><span class="p">:</span> <span class="n">State</span><span class="p">):</span>
</span><span id="__span-0-8"><a id="__codelineno-0-8" name="__codelineno-0-8"></a> <span class="n">body</span> <span class="o">=</span> <span class="k">await</span> <span class="n">fetch_body</span><span class="p">(</span><span class="n">state</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">&quot;url&quot;</span><span class="p">))</span> <span class="c1"># your async I/O</span>
</span><span id="__span-0-9"><a id="__codelineno-0-9" name="__codelineno-0-9"></a> <span class="k">yield</span> <span class="bp">self</span><span class="o">.</span><span class="n">fork</span><span class="p">(</span><span class="n">state</span><span class="p">,</span> <span class="n">payload_update</span><span class="o">=</span><span class="p">{</span><span class="s2">&quot;body&quot;</span><span class="p">:</span> <span class="n">body</span><span class="p">,</span> <span class="s2">&quot;fetched&quot;</span><span class="p">:</span> <span class="kc">True</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="k">class</span><span class="w"> </span><span class="nc">Summarize</span><span class="p">(</span><span class="n">Node</span><span class="p">):</span>
</span><span id="__span-0-12"><a id="__codelineno-0-12" name="__codelineno-0-12"></a> <span class="nb">id</span> <span class="o">=</span> <span class="s2">&quot;text.summarize&quot;</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="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 class="n">State</span><span class="p">):</span>
</span><span id="__span-0-15"><a id="__codelineno-0-15" name="__codelineno-0-15"></a> <span class="n">words</span> <span class="o">=</span> <span class="nb">len</span><span class="p">(</span><span class="n">state</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">&quot;body&quot;</span><span class="p">,</span> <span class="s2">&quot;&quot;</span><span class="p">)</span><span class="o">.</span><span class="n">split</span><span class="p">())</span>
</span><span id="__span-0-16"><a id="__codelineno-0-16" name="__codelineno-0-16"></a> <span class="k">yield</span> <span class="bp">self</span><span class="o">.</span><span class="n">fork</span><span class="p">(</span><span class="n">state</span><span class="p">,</span> <span class="n">payload_update</span><span class="o">=</span><span class="p">{</span><span class="s2">&quot;word_count&quot;</span><span class="p">:</span> <span class="n">words</span><span class="p">})</span>
</span><span id="__span-0-17"><a id="__codelineno-0-17" name="__codelineno-0-17"></a>
</span><span id="__span-0-18"><a id="__codelineno-0-18" name="__codelineno-0-18"></a><span class="k">class</span><span class="w"> </span><span class="nc">DocState</span><span class="p">(</span><span class="n">State</span><span class="p">):</span>
</span><span id="__span-0-19"><a id="__codelineno-0-19" name="__codelineno-0-19"></a> <span class="n">schema</span> <span class="o">=</span> <span class="n">Schema</span><span class="p">({</span>
</span><span id="__span-0-20"><a id="__codelineno-0-20" name="__codelineno-0-20"></a> <span class="s2">&quot;url&quot;</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span>
</span><span id="__span-0-21"><a id="__codelineno-0-21" name="__codelineno-0-21"></a> <span class="s2">&quot;body&quot;</span><span class="p">:</span> <span class="nb">str</span> <span class="o">|</span> <span class="kc">None</span><span class="p">,</span>
</span><span id="__span-0-22"><a id="__codelineno-0-22" name="__codelineno-0-22"></a> <span class="s2">&quot;fetched&quot;</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">|</span> <span class="kc">None</span><span class="p">,</span>
</span><span id="__span-0-23"><a id="__codelineno-0-23" name="__codelineno-0-23"></a> <span class="s2">&quot;word_count&quot;</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-0-24"><a id="__codelineno-0-24" name="__codelineno-0-24"></a> <span class="p">})</span>
</span></code></pre></div></td></tr></table></div>
<hr />
<h2 id="run-it">🏃 Run it</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>
<span class="normal"><a href="#__codelineno-1-9"> 9</a></span>
<span class="normal"><a href="#__codelineno-1-10">10</a></span>
<span class="normal"><a href="#__codelineno-1-11">11</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="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">main</span><span class="p">():</span>
</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2"></a> <span class="n">graph</span> <span class="o">=</span> <span class="n">Graph</span><span class="p">()</span>
</span><span id="__span-1-3"><a id="__codelineno-1-3" name="__codelineno-1-3"></a> <span class="n">graph</span><span class="o">.</span><span class="n">add_edge</span><span class="p">(</span><span class="n">FetchDoc</span><span class="p">(),</span> <span class="n">Summarize</span><span class="p">())</span>
</span><span id="__span-1-4"><a id="__codelineno-1-4" name="__codelineno-1-4"></a>
</span><span id="__span-1-5"><a id="__codelineno-1-5" name="__codelineno-1-5"></a> <span class="n">engine</span> <span class="o">=</span> <span class="n">Engine</span><span class="p">(</span><span class="n">graph</span><span class="p">)</span>
</span><span id="__span-1-6"><a id="__codelineno-1-6" name="__codelineno-1-6"></a> <span class="n">results</span> <span class="o">=</span> <span class="k">await</span> <span class="n">engine</span><span class="o">.</span><span class="n">run_async</span><span class="p">(</span><span class="n">DocState</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">&quot;url&quot;</span><span class="p">:</span> <span class="s2">&quot;https://example.com&quot;</span><span class="p">})))</span>
</span><span id="__span-1-7"><a id="__codelineno-1-7" name="__codelineno-1-7"></a>
</span><span id="__span-1-8"><a id="__codelineno-1-8" name="__codelineno-1-8"></a> <span class="k">assert</span> <span class="n">results</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">&quot;fetched&quot;</span><span class="p">)</span> <span class="ow">is</span> <span class="kc">True</span>
</span><span id="__span-1-9"><a id="__codelineno-1-9" name="__codelineno-1-9"></a> <span class="k">assert</span> <span class="n">results</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">&quot;word_count&quot;</span><span class="p">)</span> <span class="o">&gt;</span> <span class="mi">0</span>
</span><span id="__span-1-10"><a id="__codelineno-1-10" name="__codelineno-1-10"></a>
</span><span id="__span-1-11"><a id="__codelineno-1-11" name="__codelineno-1-11"></a><span class="n">asyncio</span><span class="o">.</span><span class="n">run</span><span class="p">(</span><span class="n">main</span><span class="p">())</span>
</span></code></pre></div></td></tr></table></div>
<hr />
<h2 id="how-dispatch-works">🔍 How dispatch works</h2>
<p><code>Engine.run_async</code> checks each node at execution time:</p>
<div class="language-text 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></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>node is AsyncNode ? → await node.run_async(state) # resolve_async()
</span><span id="__span-2-2"><a id="__codelineno-2-2" name="__codelineno-2-2"></a> → node.run(state) # resolve()
</span></code></pre></div></td></tr></table></div>
<ul>
<li><code>AsyncNode.resolve()</code> is a <strong>no-op</strong> (returns <code>()</code>), so a <em>sync</em> engine
(<code>run</code>) treats async nodes as if they pruned the branch.</li>
<li><code>AsyncNode.resolve_async()</code> may be a plain <code>async def</code> returning an iterable,
or an async generator — both are supported.</li>
<li><code>run_async</code> validates that yielded objects are <code>State</code> (raises <code>TypeError</code>
otherwise), exactly like the sync path.</li>
</ul>
<hr />
<h2 id="async-step-wise-variant">🔍 Async step-wise variant</h2>
<p><code>run_steps_async</code> pairs with async nodes for progress + resume:</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></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">async</span> <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_async</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="nb">print</span><span class="p">(</span><span class="n">step</span><span class="o">.</span><span class="n">index</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 class="nb">len</span><span class="p">(</span><span class="n">step</span><span class="o">.</span><span class="n">states</span><span class="p">),</span> <span class="n">step</span><span class="o">.</span><span class="n">completed</span><span class="p">)</span>
</span></code></pre></div></td></tr></table></div>
<hr />
<h2 id="tips">💡 Tips</h2>
<ul>
<li>Async nodes and sync nodes <strong>interleave freely</strong> — no need to split phases.</li>
<li>For true concurrency across branches, combine async nodes with a library like
<code>asyncio.gather</code> inside a single wrapper node.</li>
<li>Don't call <code>run_async</code> on an engine whose nodes are all sync — you pay event
loop overhead for nothing; <code>run</code> is fine there.</li>
<li>Cancellation patterns (timeouts, retries) belong inside <code>resolve_async</code>, not
the engine — keep the engine generic.</li>
</ul>
<hr />
<h2 id="related">📚 Related</h2>
<ul>
<li><a href="../02_graph_execution/">02 – Graph execution</a> · <a href="../07_step_execution/">07 – Step-wise execution</a> · <a href="../../02_components/">02 – Core Components</a></li>
</ul>
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