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| <h1>Source code for airflow.contrib.operators.gcs_download_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">import</span> <span class="nn">sys</span> |
| |
| <span class="kn">from</span> <span class="nn">airflow.contrib.hooks.gcs_hook</span> <span class="k">import</span> <span class="n">GoogleCloudStorageHook</span> |
| <span class="kn">from</span> <span class="nn">airflow.models</span> <span class="k">import</span> <span class="n">BaseOperator</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="GoogleCloudStorageDownloadOperator"><a class="viewcode-back" href="../../../../integration.html#airflow.contrib.operators.gcs_download_operator.GoogleCloudStorageDownloadOperator">[docs]</a><span class="k">class</span> <span class="nc">GoogleCloudStorageDownloadOperator</span><span class="p">(</span><span class="n">BaseOperator</span><span class="p">):</span> |
| <span class="sd">"""</span> |
| <span class="sd"> Downloads a file from Google Cloud Storage.</span> |
| |
| <span class="sd"> :param bucket: The Google cloud storage bucket where the object is. (templated)</span> |
| <span class="sd"> :type bucket: string</span> |
| <span class="sd"> :param object: The name of the object to download in the Google cloud</span> |
| <span class="sd"> storage bucket. (templated)</span> |
| <span class="sd"> :type object: string</span> |
| <span class="sd"> :param filename: The file path on the local file system (where the</span> |
| <span class="sd"> operator is being executed) that the file should be downloaded to. (templated)</span> |
| <span class="sd"> If no filename passed, the downloaded data will not be stored on the local file</span> |
| <span class="sd"> system.</span> |
| <span class="sd"> :type filename: string</span> |
| <span class="sd"> :param store_to_xcom_key: If this param is set, the operator will push</span> |
| <span class="sd"> the contents of the downloaded file to XCom with the key set in this</span> |
| <span class="sd"> parameter. If not set, the downloaded data will not be pushed to XCom. (templated)</span> |
| <span class="sd"> :type store_to_xcom_key: string</span> |
| <span class="sd"> :param google_cloud_storage_conn_id: The connection ID to use when</span> |
| <span class="sd"> connecting to Google cloud storage.</span> |
| <span class="sd"> :type google_cloud_storage_conn_id: string</span> |
| <span class="sd"> :param delegate_to: The account to impersonate, if any.</span> |
| <span class="sd"> For this to work, the service account making the request must have</span> |
| <span class="sd"> domain-wide delegation enabled.</span> |
| <span class="sd"> :type delegate_to: string</span> |
| <span class="sd"> """</span> |
| <span class="n">template_fields</span> <span class="o">=</span> <span class="p">(</span><span class="s1">'bucket'</span><span class="p">,</span> <span class="s1">'object'</span><span class="p">,</span> <span class="s1">'filename'</span><span class="p">,</span> <span class="s1">'store_to_xcom_key'</span><span class="p">,)</span> |
| <span class="n">ui_color</span> <span class="o">=</span> <span class="s1">'#f0eee4'</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">bucket</span><span class="p">,</span> |
| <span class="nb">object</span><span class="p">,</span> |
| <span class="n">filename</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> |
| <span class="n">store_to_xcom_key</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> |
| <span class="n">google_cloud_storage_conn_id</span><span class="o">=</span><span class="s1">'google_cloud_default'</span><span class="p">,</span> |
| <span class="n">delegate_to</span><span class="o">=</span><span class="kc">None</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">GoogleCloudStorageDownloadOperator</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">bucket</span> <span class="o">=</span> <span class="n">bucket</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">object</span> <span class="o">=</span> <span class="nb">object</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">filename</span> <span class="o">=</span> <span class="n">filename</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">store_to_xcom_key</span> <span class="o">=</span> <span class="n">store_to_xcom_key</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">google_cloud_storage_conn_id</span> <span class="o">=</span> <span class="n">google_cloud_storage_conn_id</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">delegate_to</span> <span class="o">=</span> <span class="n">delegate_to</span> |
| |
| <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="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">'Executing download: </span><span class="si">%s</span><span class="s1">, </span><span class="si">%s</span><span class="s1">, </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">bucket</span><span class="p">,</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">object</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">filename</span><span class="p">)</span> |
| <span class="n">hook</span> <span class="o">=</span> <span class="n">GoogleCloudStorageHook</span><span class="p">(</span> |
| <span class="n">google_cloud_storage_conn_id</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">google_cloud_storage_conn_id</span><span class="p">,</span> |
| <span class="n">delegate_to</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">delegate_to</span> |
| <span class="p">)</span> |
| <span class="n">file_bytes</span> <span class="o">=</span> <span class="n">hook</span><span class="o">.</span><span class="n">download</span><span class="p">(</span><span class="n">bucket</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">bucket</span><span class="p">,</span> |
| <span class="nb">object</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">object</span><span class="p">,</span> |
| <span class="n">filename</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">filename</span><span class="p">)</span> |
| <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">store_to_xcom_key</span><span class="p">:</span> |
| <span class="k">if</span> <span class="n">sys</span><span class="o">.</span><span class="n">getsizeof</span><span class="p">(</span><span class="n">file_bytes</span><span class="p">)</span> <span class="o"><</span> <span class="mi">48000</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">xcom_push</span><span class="p">(</span><span class="n">key</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">store_to_xcom_key</span><span class="p">,</span> <span class="n">value</span><span class="o">=</span><span class="n">file_bytes</span><span class="p">)</span> |
| <span class="k">else</span><span class="p">:</span> |
| <span class="k">raise</span> <span class="ne">RuntimeError</span><span class="p">(</span> |
| <span class="s1">'The size of the downloaded file is too large to push to XCom!'</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="n">file_bytes</span><span class="p">)</span></div> |
| </pre></div> |
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