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| <h1>Source code for airflow.contrib.sensors.ftp_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"># "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">import</span> <span class="nn">ftplib</span> |
| <span class="kn">import</span> <span class="nn">re</span> |
| |
| <span class="kn">from</span> <span class="nn">airflow.contrib.hooks.ftp_hook</span> <span class="k">import</span> <span class="n">FTPHook</span><span class="p">,</span> <span class="n">FTPSHook</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> |
| |
| |
| <div class="viewcode-block" id="FTPSensor"><a class="viewcode-back" href="../../../../code.html#airflow.contrib.sensors.ftp_sensor.FTPSensor">[docs]</a><span class="k">class</span> <span class="nc">FTPSensor</span><span class="p">(</span><span class="n">BaseSensorOperator</span><span class="p">):</span> |
| <span class="sd">"""</span> |
| <span class="sd"> Waits for a file or directory to be present on FTP.</span> |
| <span class="sd"> """</span> |
| |
| <span class="n">template_fields</span> <span class="o">=</span> <span class="p">(</span><span class="s1">'path'</span><span class="p">,)</span> |
| |
| <span class="sd">"""Errors that are transient in nature, and where action can be retried"""</span> |
| <span class="n">transient_errors</span> <span class="o">=</span> <span class="p">[</span><span class="mi">421</span><span class="p">,</span> <span class="mi">425</span><span class="p">,</span> <span class="mi">426</span><span class="p">,</span> <span class="mi">434</span><span class="p">,</span> <span class="mi">450</span><span class="p">,</span> <span class="mi">451</span><span class="p">,</span> <span class="mi">452</span><span class="p">]</span> |
| |
| <span class="n">error_code_pattern</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="s2">"([\d]+)"</span><span class="p">)</span> |
| |
| <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">path</span><span class="p">,</span> |
| <span class="n">ftp_conn_id</span><span class="o">=</span><span class="s1">'ftp_default'</span><span class="p">,</span> |
| <span class="n">fail_on_transient_errors</span><span class="o">=</span><span class="kc">True</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="sd">"""</span> |
| <span class="sd"> Create a new FTP sensor</span> |
| |
| <span class="sd"> :param path: Remote file or directory path</span> |
| <span class="sd"> :type path: str</span> |
| <span class="sd"> :param fail_on_transient_errors: Fail on all errors,</span> |
| <span class="sd"> including 4xx transient errors. Default True.</span> |
| <span class="sd"> :type fail_on_transient_errors: bool</span> |
| <span class="sd"> :param ftp_conn_id: The connection to run the sensor against</span> |
| <span class="sd"> :type ftp_conn_id: str</span> |
| <span class="sd"> """</span> |
| |
| <span class="nb">super</span><span class="p">(</span><span class="n">FTPSensor</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="bp">self</span><span class="o">.</span><span class="n">path</span> <span class="o">=</span> <span class="n">path</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">ftp_conn_id</span> <span class="o">=</span> <span class="n">ftp_conn_id</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">fail_on_transient_errors</span> <span class="o">=</span> <span class="n">fail_on_transient_errors</span> |
| |
| <span class="k">def</span> <span class="nf">_create_hook</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> |
| <span class="sd">"""Return connection hook."""</span> |
| <span class="k">return</span> <span class="n">FTPHook</span><span class="p">(</span><span class="n">ftp_conn_id</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">ftp_conn_id</span><span class="p">)</span> |
| |
| <span class="k">def</span> <span class="nf">_get_error_code</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">e</span><span class="p">):</span> |
| <span class="sd">"""Extract error code from ftp exception"""</span> |
| <span class="k">try</span><span class="p">:</span> |
| <span class="n">matches</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">error_code_pattern</span><span class="o">.</span><span class="n">match</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="n">code</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><span class="n">matches</span><span class="o">.</span><span class="n">group</span><span class="p">(</span><span class="mi">0</span><span class="p">))</span> |
| <span class="k">return</span> <span class="n">code</span> |
| <span class="k">except</span> <span class="ne">ValueError</span><span class="p">:</span> |
| <span class="k">return</span> <span class="n">e</span> |
| |
| <div class="viewcode-block" id="FTPSensor.poke"><a class="viewcode-back" href="../../../../code.html#airflow.contrib.sensors.ftp_sensor.FTPSensor.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="k">with</span> <span class="bp">self</span><span class="o">.</span><span class="n">_create_hook</span><span class="p">()</span> <span class="k">as</span> <span class="n">hook</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">'Poking for </span><span class="si">%s</span><span class="s1">'</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">path</span><span class="p">)</span> |
| <span class="k">try</span><span class="p">:</span> |
| <span class="n">hook</span><span class="o">.</span><span class="n">get_mod_time</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">path</span><span class="p">)</span> |
| <span class="k">except</span> <span class="n">ftplib</span><span class="o">.</span><span class="n">error_perm</span> <span class="k">as</span> <span class="n">e</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">'Ftp error encountered: </span><span class="si">%s</span><span class="s1">'</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="n">error_code</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_get_error_code</span><span class="p">(</span><span class="n">e</span><span class="p">)</span> |
| <span class="k">if</span> <span class="p">((</span><span class="n">error_code</span> <span class="o">!=</span> <span class="mi">550</span><span class="p">)</span> <span class="ow">and</span> |
| <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">fail_on_transient_errors</span> <span class="ow">or</span> |
| <span class="p">(</span><span class="n">error_code</span> <span class="ow">not</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">transient_errors</span><span class="p">))):</span> |
| <span class="k">raise</span> <span class="n">e</span> |
| |
| <span class="k">return</span> <span class="kc">False</span> |
| |
| <span class="k">return</span> <span class="kc">True</span></div></div> |
| |
| |
| <div class="viewcode-block" id="FTPSSensor"><a class="viewcode-back" href="../../../../code.html#airflow.contrib.sensors.ftp_sensor.FTPSSensor">[docs]</a><span class="k">class</span> <span class="nc">FTPSSensor</span><span class="p">(</span><span class="n">FTPSensor</span><span class="p">):</span> |
| <span class="sd">"""Waits for a file or directory to be present on FTP over SSL."""</span> |
| <span class="k">def</span> <span class="nf">_create_hook</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> |
| <span class="sd">"""Return connection hook."""</span> |
| <span class="k">return</span> <span class="n">FTPSHook</span><span class="p">(</span><span class="n">ftp_conn_id</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">ftp_conn_id</span><span class="p">)</span></div> |
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