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<h1>Source code for airflow.sensors.hdfs_sensor</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"># &quot;License&quot;); 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"># &quot;AS IS&quot; 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">import</span> <span class="nn">re</span>
<span class="kn">import</span> <span class="nn">sys</span>
<span class="kn">from</span> <span class="nn">builtins</span> <span class="k">import</span> <span class="nb">str</span>
<span class="kn">from</span> <span class="nn">airflow</span> <span class="k">import</span> <span class="n">settings</span>
<span class="kn">from</span> <span class="nn">airflow.hooks.hdfs_hook</span> <span class="k">import</span> <span class="n">HDFSHook</span>
<span class="kn">from</span> <span class="nn">airflow.sensors.base_sensor_operator</span> <span class="k">import</span> <span class="n">BaseSensorOperator</span>
<span class="kn">from</span> <span class="nn">airflow.utils.decorators</span> <span class="k">import</span> <span class="n">apply_defaults</span>
<span class="kn">from</span> <span class="nn">airflow.utils.log.logging_mixin</span> <span class="k">import</span> <span class="n">LoggingMixin</span>
<div class="viewcode-block" id="HdfsSensor"><a class="viewcode-back" href="../../../_api/airflow/sensors/hdfs_sensor/index.html#airflow.sensors.hdfs_sensor.HdfsSensor">[docs]</a><span class="k">class</span> <span class="nc">HdfsSensor</span><span class="p">(</span><span class="n">BaseSensorOperator</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Waits for a file or folder to land in HDFS</span>
<span class="sd"> &quot;&quot;&quot;</span>
<div class="viewcode-block" id="HdfsSensor.template_fields"><a class="viewcode-back" href="../../../_api/airflow/sensors/hdfs_sensor/index.html#airflow.sensors.hdfs_sensor.HdfsSensor.template_fields">[docs]</a> <span class="n">template_fields</span> <span class="o">=</span> <span class="p">(</span><span class="s1">&#39;filepath&#39;</span><span class="p">,)</span></div>
<div class="viewcode-block" id="HdfsSensor.ui_color"><a class="viewcode-back" href="../../../_api/airflow/sensors/hdfs_sensor/index.html#airflow.sensors.hdfs_sensor.HdfsSensor.ui_color">[docs]</a> <span class="n">ui_color</span> <span class="o">=</span> <span class="n">settings</span><span class="o">.</span><span class="n">WEB_COLORS</span><span class="p">[</span><span class="s1">&#39;LIGHTBLUE&#39;</span><span class="p">]</span></div>
<span class="nd">@apply_defaults</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span>
<span class="n">filepath</span><span class="p">,</span>
<span class="n">hdfs_conn_id</span><span class="o">=</span><span class="s1">&#39;hdfs_default&#39;</span><span class="p">,</span>
<span class="n">ignored_ext</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span>
<span class="n">ignore_copying</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span>
<span class="n">file_size</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span>
<span class="n">hook</span><span class="o">=</span><span class="n">HDFSHook</span><span class="p">,</span>
<span class="o">*</span><span class="n">args</span><span class="p">,</span>
<span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="nb">super</span><span class="p">(</span><span class="n">HdfsSensor</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
<span class="k">if</span> <span class="n">ignored_ext</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="n">ignored_ext</span> <span class="o">=</span> <span class="p">[</span><span class="s1">&#39;_COPYING_&#39;</span><span class="p">]</span>
<span class="bp">self</span><span class="o">.</span><span class="n">filepath</span> <span class="o">=</span> <span class="n">filepath</span>
<span class="bp">self</span><span class="o">.</span><span class="n">hdfs_conn_id</span> <span class="o">=</span> <span class="n">hdfs_conn_id</span>
<span class="bp">self</span><span class="o">.</span><span class="n">file_size</span> <span class="o">=</span> <span class="n">file_size</span>
<span class="bp">self</span><span class="o">.</span><span class="n">ignored_ext</span> <span class="o">=</span> <span class="n">ignored_ext</span>
<span class="bp">self</span><span class="o">.</span><span class="n">ignore_copying</span> <span class="o">=</span> <span class="n">ignore_copying</span>
<span class="bp">self</span><span class="o">.</span><span class="n">hook</span> <span class="o">=</span> <span class="n">hook</span>
<span class="nd">@staticmethod</span>
<div class="viewcode-block" id="HdfsSensor.filter_for_filesize"><a class="viewcode-back" href="../../../_api/airflow/sensors/hdfs_sensor/index.html#airflow.sensors.hdfs_sensor.HdfsSensor.filter_for_filesize">[docs]</a> <span class="k">def</span> <span class="nf">filter_for_filesize</span><span class="p">(</span><span class="n">result</span><span class="p">,</span> <span class="n">size</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Will test the filepath result and test if its size is at least self.filesize</span>
<span class="sd"> :param result: a list of dicts returned by Snakebite ls</span>
<span class="sd"> :param size: the file size in MB a file should be at least to trigger True</span>
<span class="sd"> :return: (bool) depending on the matching criteria</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="k">if</span> <span class="n">size</span><span class="p">:</span>
<span class="n">log</span> <span class="o">=</span> <span class="n">LoggingMixin</span><span class="p">()</span><span class="o">.</span><span class="n">log</span>
<span class="n">log</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span>
<span class="s1">&#39;Filtering for file size &gt;= </span><span class="si">%s</span><span class="s1"> in files: </span><span class="si">%s</span><span class="s1">&#39;</span><span class="p">,</span>
<span class="n">size</span><span class="p">,</span> <span class="nb">map</span><span class="p">(</span><span class="k">lambda</span> <span class="n">x</span><span class="p">:</span> <span class="n">x</span><span class="p">[</span><span class="s1">&#39;path&#39;</span><span class="p">],</span> <span class="n">result</span><span class="p">)</span>
<span class="p">)</span>
<span class="n">size</span> <span class="o">*=</span> <span class="n">settings</span><span class="o">.</span><span class="n">MEGABYTE</span>
<span class="n">result</span> <span class="o">=</span> <span class="p">[</span><span class="n">x</span> <span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="n">result</span> <span class="k">if</span> <span class="n">x</span><span class="p">[</span><span class="s1">&#39;length&#39;</span><span class="p">]</span> <span class="o">&gt;=</span> <span class="n">size</span><span class="p">]</span>
<span class="n">log</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s1">&#39;HdfsSensor.poke: after size filter result is </span><span class="si">%s</span><span class="s1">&#39;</span><span class="p">,</span> <span class="n">result</span><span class="p">)</span>
<span class="k">return</span> <span class="n">result</span></div>
<span class="nd">@staticmethod</span>
<div class="viewcode-block" id="HdfsSensor.filter_for_ignored_ext"><a class="viewcode-back" href="../../../_api/airflow/sensors/hdfs_sensor/index.html#airflow.sensors.hdfs_sensor.HdfsSensor.filter_for_ignored_ext">[docs]</a> <span class="k">def</span> <span class="nf">filter_for_ignored_ext</span><span class="p">(</span><span class="n">result</span><span class="p">,</span> <span class="n">ignored_ext</span><span class="p">,</span> <span class="n">ignore_copying</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Will filter if instructed to do so the result to remove matching criteria</span>
<span class="sd"> :param result: list of dicts returned by Snakebite ls</span>
<span class="sd"> :type result: list[dict]</span>
<span class="sd"> :param ignored_ext: list of ignored extensions</span>
<span class="sd"> :type ignored_ext: list</span>
<span class="sd"> :param ignore_copying: shall we ignore ?</span>
<span class="sd"> :type ignore_copying: bool</span>
<span class="sd"> :return: list of dicts which were not removed</span>
<span class="sd"> :rtype: list[dict]</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="k">if</span> <span class="n">ignore_copying</span><span class="p">:</span>
<span class="n">log</span> <span class="o">=</span> <span class="n">LoggingMixin</span><span class="p">()</span><span class="o">.</span><span class="n">log</span>
<span class="n">regex_builder</span> <span class="o">=</span> <span class="sa">r</span><span class="s2">&quot;^.*\.(</span><span class="si">%s</span><span class="s2">$)$&quot;</span> <span class="o">%</span> <span class="s1">&#39;$|&#39;</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">ignored_ext</span><span class="p">)</span>
<span class="n">ignored_extensions_regex</span> <span class="o">=</span> <span class="n">re</span><span class="o">.</span><span class="n">compile</span><span class="p">(</span><span class="n">regex_builder</span><span class="p">)</span>
<span class="n">log</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span>
<span class="s1">&#39;Filtering result for ignored extensions: </span><span class="si">%s</span><span class="s1"> in files </span><span class="si">%s</span><span class="s1">&#39;</span><span class="p">,</span>
<span class="n">ignored_extensions_regex</span><span class="o">.</span><span class="n">pattern</span><span class="p">,</span> <span class="nb">map</span><span class="p">(</span><span class="k">lambda</span> <span class="n">x</span><span class="p">:</span> <span class="n">x</span><span class="p">[</span><span class="s1">&#39;path&#39;</span><span class="p">],</span> <span class="n">result</span><span class="p">)</span>
<span class="p">)</span>
<span class="n">result</span> <span class="o">=</span> <span class="p">[</span><span class="n">x</span> <span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="n">result</span> <span class="k">if</span> <span class="ow">not</span> <span class="n">ignored_extensions_regex</span><span class="o">.</span><span class="n">match</span><span class="p">(</span><span class="n">x</span><span class="p">[</span><span class="s1">&#39;path&#39;</span><span class="p">])]</span>
<span class="n">log</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s1">&#39;HdfsSensor.poke: after ext filter result is </span><span class="si">%s</span><span class="s1">&#39;</span><span class="p">,</span> <span class="n">result</span><span class="p">)</span>
<span class="k">return</span> <span class="n">result</span></div>
<div class="viewcode-block" id="HdfsSensor.poke"><a class="viewcode-back" href="../../../_api/airflow/sensors/hdfs_sensor/index.html#airflow.sensors.hdfs_sensor.HdfsSensor.poke">[docs]</a> <span class="k">def</span> <span class="nf">poke</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="n">sb</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">hook</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">hdfs_conn_id</span><span class="p">)</span><span class="o">.</span><span class="n">get_conn</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">&#39;Poking for file </span><span class="si">%s</span><span class="s1">&#39;</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">filepath</span><span class="p">)</span>
<span class="k">try</span><span class="p">:</span>
<span class="c1"># IMOO it&#39;s not right here, as there no raise of any kind.</span>
<span class="c1"># if the filepath is let&#39;s say &#39;/data/mydirectory&#39;,</span>
<span class="c1"># it&#39;s correct but if it is &#39;/data/mydirectory/*&#39;,</span>
<span class="c1"># it&#39;s not correct as the directory exists and sb does not raise any error</span>
<span class="c1"># here is a quick fix</span>
<span class="n">result</span> <span class="o">=</span> <span class="p">[</span><span class="n">f</span> <span class="k">for</span> <span class="n">f</span> <span class="ow">in</span> <span class="n">sb</span><span class="o">.</span><span class="n">ls</span><span class="p">([</span><span class="bp">self</span><span class="o">.</span><span class="n">filepath</span><span class="p">],</span> <span class="n">include_toplevel</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="s1">&#39;HdfsSensor.poke: result is </span><span class="si">%s</span><span class="s1">&#39;</span><span class="p">,</span> <span class="n">result</span><span class="p">)</span>
<span class="n">result</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">filter_for_ignored_ext</span><span class="p">(</span>
<span class="n">result</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">ignored_ext</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">ignore_copying</span>
<span class="p">)</span>
<span class="n">result</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">filter_for_filesize</span><span class="p">(</span><span class="n">result</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">file_size</span><span class="p">)</span>
<span class="k">return</span> <span class="nb">bool</span><span class="p">(</span><span class="n">result</span><span class="p">)</span>
<span class="k">except</span> <span class="ne">Exception</span><span class="p">:</span>
<span class="n">e</span> <span class="o">=</span> <span class="n">sys</span><span class="o">.</span><span class="n">exc_info</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">&quot;Caught an exception !: </span><span class="si">%s</span><span class="s2">&quot;</span><span class="p">,</span> <span class="nb">str</span><span class="p">(</span><span class="n">e</span><span class="p">))</span>
<span class="k">return</span> <span class="kc">False</span></div></div>
</pre></div>
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