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| <h1>Source code for airflow.operators.latest_only_operator</h1><div class="highlight"><pre> |
| <span></span><span class="c1"># -*- coding: utf-8 -*-</span> |
| <span class="c1">#</span> |
| <span class="c1"># Licensed to the Apache Software Foundation (ASF) under one</span> |
| <span class="c1"># or more contributor license agreements. See the NOTICE file</span> |
| <span class="c1"># distributed with this work for additional information</span> |
| <span class="c1"># regarding copyright ownership. The ASF licenses this file</span> |
| <span class="c1"># to you under the Apache License, Version 2.0 (the</span> |
| <span class="c1"># "License"); you may not use this file except in compliance</span> |
| <span class="c1"># with the License. You may obtain a copy of the License at</span> |
| <span class="c1">#</span> |
| <span class="c1"># http://www.apache.org/licenses/LICENSE-2.0</span> |
| <span class="c1">#</span> |
| <span class="c1"># Unless required by applicable law or agreed to in writing,</span> |
| <span class="c1"># software distributed under the License is distributed on an</span> |
| <span class="c1"># "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY</span> |
| <span class="c1"># KIND, either express or implied. See the License for the</span> |
| <span class="c1"># specific language governing permissions and limitations</span> |
| <span class="c1"># under the License.</span> |
| |
| <span class="kn">from</span> <span class="nn">airflow.models</span> <span class="k">import</span> <span class="n">BaseOperator</span><span class="p">,</span> <span class="n">SkipMixin</span> |
| <span class="kn">from</span> <span class="nn">airflow.utils</span> <span class="k">import</span> <span class="n">timezone</span> |
| |
| |
| <div class="viewcode-block" id="LatestOnlyOperator"><a class="viewcode-back" href="../../../code.html#airflow.operators.latest_only_operator.LatestOnlyOperator">[docs]</a><span class="k">class</span> <span class="nc">LatestOnlyOperator</span><span class="p">(</span><span class="n">BaseOperator</span><span class="p">,</span> <span class="n">SkipMixin</span><span class="p">):</span> |
| <span class="sd">"""</span> |
| <span class="sd"> Allows a workflow to skip tasks that are not running during the most</span> |
| <span class="sd"> recent schedule interval.</span> |
| |
| <span class="sd"> If the task is run outside of the latest schedule interval, all</span> |
| <span class="sd"> directly downstream tasks will be skipped.</span> |
| <span class="sd"> """</span> |
| |
| <span class="n">ui_color</span> <span class="o">=</span> <span class="s1">'#e9ffdb'</span> <span class="c1"># nyanza</span> |
| |
| <div class="viewcode-block" id="LatestOnlyOperator.execute"><a class="viewcode-back" href="../../../code.html#airflow.operators.latest_only_operator.LatestOnlyOperator.execute">[docs]</a> <span class="k">def</span> <span class="nf">execute</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">context</span><span class="p">):</span> |
| <span class="c1"># If the DAG Run is externally triggered, then return without</span> |
| <span class="c1"># skipping downstream tasks</span> |
| <span class="k">if</span> <span class="n">context</span><span class="p">[</span><span class="s1">'dag_run'</span><span class="p">]</span> <span class="ow">and</span> <span class="n">context</span><span class="p">[</span><span class="s1">'dag_run'</span><span class="p">]</span><span class="o">.</span><span class="n">external_trigger</span><span class="p">:</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">log</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s2">"Externally triggered DAG_Run: allowing execution to proceed."</span><span class="p">)</span> |
| <span class="k">return</span> |
| |
| <span class="n">now</span> <span class="o">=</span> <span class="n">timezone</span><span class="o">.</span><span class="n">utcnow</span><span class="p">()</span> |
| <span class="n">left_window</span> <span class="o">=</span> <span class="n">context</span><span class="p">[</span><span class="s1">'dag'</span><span class="p">]</span><span class="o">.</span><span class="n">following_schedule</span><span class="p">(</span> |
| <span class="n">context</span><span class="p">[</span><span class="s1">'execution_date'</span><span class="p">])</span> |
| <span class="n">right_window</span> <span class="o">=</span> <span class="n">context</span><span class="p">[</span><span class="s1">'dag'</span><span class="p">]</span><span class="o">.</span><span class="n">following_schedule</span><span class="p">(</span><span class="n">left_window</span><span class="p">)</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">log</span><span class="o">.</span><span class="n">info</span><span class="p">(</span> |
| <span class="s1">'Checking latest only with left_window: </span><span class="si">%s</span><span class="s1"> right_window: </span><span class="si">%s</span><span class="s1"> now: </span><span class="si">%s</span><span class="s1">'</span><span class="p">,</span> |
| <span class="n">left_window</span><span class="p">,</span> <span class="n">right_window</span><span class="p">,</span> <span class="n">now</span> |
| <span class="p">)</span> |
| |
| <span class="k">if</span> <span class="ow">not</span> <span class="n">left_window</span> <span class="o"><</span> <span class="n">now</span> <span class="o"><=</span> <span class="n">right_window</span><span class="p">:</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">log</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s1">'Not latest execution, skipping downstream.'</span><span class="p">)</span> |
| |
| <span class="n">downstream_tasks</span> <span class="o">=</span> <span class="n">context</span><span class="p">[</span><span class="s1">'task'</span><span class="p">]</span><span class="o">.</span><span class="n">get_flat_relatives</span><span class="p">(</span><span class="n">upstream</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">log</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s2">"Downstream task_ids </span><span class="si">%s</span><span class="s2">"</span><span class="p">,</span> <span class="n">downstream_tasks</span><span class="p">)</span> |
| |
| <span class="k">if</span> <span class="n">downstream_tasks</span><span class="p">:</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">skip</span><span class="p">(</span><span class="n">context</span><span class="p">[</span><span class="s1">'dag_run'</span><span class="p">],</span> |
| <span class="n">context</span><span class="p">[</span><span class="s1">'ti'</span><span class="p">]</span><span class="o">.</span><span class="n">execution_date</span><span class="p">,</span> |
| <span class="n">downstream_tasks</span><span class="p">)</span> |
| |
| <span class="bp">self</span><span class="o">.</span><span class="n">log</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s1">'Done.'</span><span class="p">)</span> |
| <span class="k">else</span><span class="p">:</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">log</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s1">'Latest, allowing execution to proceed.'</span><span class="p">)</span></div></div> |
| </pre></div> |
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