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<h1>Source code for airflow.contrib.operators.mysql_to_gcs</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">sys</span>
<span class="kn">import</span> <span class="nn">json</span>
<span class="kn">import</span> <span class="nn">time</span>
<span class="kn">import</span> <span class="nn">base64</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.hooks.mysql_hook</span> <span class="k">import</span> <span class="n">MySqlHook</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>
<span class="kn">from</span> <span class="nn">datetime</span> <span class="k">import</span> <span class="n">date</span><span class="p">,</span> <span class="n">datetime</span>
<span class="kn">from</span> <span class="nn">decimal</span> <span class="k">import</span> <span class="n">Decimal</span>
<span class="kn">from</span> <span class="nn">MySQLdb.constants</span> <span class="k">import</span> <span class="n">FIELD_TYPE</span>
<span class="kn">from</span> <span class="nn">tempfile</span> <span class="k">import</span> <span class="n">NamedTemporaryFile</span>
<span class="kn">from</span> <span class="nn">six</span> <span class="k">import</span> <span class="n">string_types</span>
<span class="kn">import</span> <span class="nn">unicodecsv</span> <span class="k">as</span> <span class="nn">csv</span>
<div class="viewcode-block" id="PY3"><a class="viewcode-back" href="../../../../_api/airflow/contrib/operators/mysql_to_gcs/index.html#airflow.contrib.operators.mysql_to_gcs.PY3">[docs]</a><span class="n">PY3</span> <span class="o">=</span> <span class="n">sys</span><span class="o">.</span><span class="n">version_info</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o">==</span> <span class="mi">3</span></div>
<div class="viewcode-block" id="MySqlToGoogleCloudStorageOperator"><a class="viewcode-back" href="../../../../_api/airflow/contrib/operators/mysql_to_gcs/index.html#airflow.contrib.operators.mysql_to_gcs.MySqlToGoogleCloudStorageOperator">[docs]</a><span class="k">class</span> <span class="nc">MySqlToGoogleCloudStorageOperator</span><span class="p">(</span><span class="n">BaseOperator</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;Copy data from MySQL to Google cloud storage in JSON or CSV format.</span>
<span class="sd"> The JSON data files generated are newline-delimited to enable them to be</span>
<span class="sd"> loaded into BigQuery.</span>
<span class="sd"> Reference: https://cloud.google.com/bigquery/docs/</span>
<span class="sd"> loading-data-cloud-storage-json#limitations</span>
<span class="sd"> :param sql: The SQL to execute on the MySQL table.</span>
<span class="sd"> :type sql: str</span>
<span class="sd"> :param bucket: The bucket to upload to.</span>
<span class="sd"> :type bucket: str</span>
<span class="sd"> :param filename: The filename to use as the object name when uploading</span>
<span class="sd"> to Google cloud storage. A {} should be specified in the filename</span>
<span class="sd"> to allow the operator to inject file numbers in cases where the</span>
<span class="sd"> file is split due to size.</span>
<span class="sd"> :type filename: str</span>
<span class="sd"> :param schema_filename: If set, the filename to use as the object name</span>
<span class="sd"> when uploading a .json file containing the BigQuery schema fields</span>
<span class="sd"> for the table that was dumped from MySQL.</span>
<span class="sd"> :type schema_filename: str</span>
<span class="sd"> :param approx_max_file_size_bytes: This operator supports the ability</span>
<span class="sd"> to split large table dumps into multiple files (see notes in the</span>
<span class="sd"> filenamed param docs above). Google cloud storage allows for files</span>
<span class="sd"> to be a maximum of 4GB. This param allows developers to specify the</span>
<span class="sd"> file size of the splits.</span>
<span class="sd"> :type approx_max_file_size_bytes: long</span>
<span class="sd"> :param mysql_conn_id: Reference to a specific MySQL hook.</span>
<span class="sd"> :type mysql_conn_id: str</span>
<span class="sd"> :param google_cloud_storage_conn_id: Reference to a specific Google</span>
<span class="sd"> cloud storage hook.</span>
<span class="sd"> :type google_cloud_storage_conn_id: str</span>
<span class="sd"> :param schema: The schema to use, if any. Should be a list of dict or</span>
<span class="sd"> a str. Pass a string if using Jinja template, otherwise, pass a list of</span>
<span class="sd"> dict. Examples could be seen: https://cloud.google.com/bigquery/docs</span>
<span class="sd"> /schemas#specifying_a_json_schema_file</span>
<span class="sd"> :type schema: str or list</span>
<span class="sd"> :param delegate_to: The account to impersonate, if any. For this to</span>
<span class="sd"> work, the service account making the request must have domain-wide</span>
<span class="sd"> delegation enabled.</span>
<span class="sd"> :type delegate_to: str</span>
<span class="sd"> :param export_format: Desired format of files to be exported.</span>
<span class="sd"> :type export_format: str</span>
<span class="sd"> :param field_delimiter: The delimiter to be used for CSV files.</span>
<span class="sd"> :type field_delimiter: str</span>
<span class="sd"> &quot;&quot;&quot;</span>
<div class="viewcode-block" id="MySqlToGoogleCloudStorageOperator.template_fields"><a class="viewcode-back" href="../../../../_api/airflow/contrib/operators/mysql_to_gcs/index.html#airflow.contrib.operators.mysql_to_gcs.MySqlToGoogleCloudStorageOperator.template_fields">[docs]</a> <span class="n">template_fields</span> <span class="o">=</span> <span class="p">(</span><span class="s1">&#39;sql&#39;</span><span class="p">,</span> <span class="s1">&#39;bucket&#39;</span><span class="p">,</span> <span class="s1">&#39;filename&#39;</span><span class="p">,</span> <span class="s1">&#39;schema_filename&#39;</span><span class="p">,</span> <span class="s1">&#39;schema&#39;</span><span class="p">)</span></div>
<div class="viewcode-block" id="MySqlToGoogleCloudStorageOperator.template_ext"><a class="viewcode-back" href="../../../../_api/airflow/contrib/operators/mysql_to_gcs/index.html#airflow.contrib.operators.mysql_to_gcs.MySqlToGoogleCloudStorageOperator.template_ext">[docs]</a> <span class="n">template_ext</span> <span class="o">=</span> <span class="p">(</span><span class="s1">&#39;.sql&#39;</span><span class="p">,)</span></div>
<div class="viewcode-block" id="MySqlToGoogleCloudStorageOperator.ui_color"><a class="viewcode-back" href="../../../../_api/airflow/contrib/operators/mysql_to_gcs/index.html#airflow.contrib.operators.mysql_to_gcs.MySqlToGoogleCloudStorageOperator.ui_color">[docs]</a> <span class="n">ui_color</span> <span class="o">=</span> <span class="s1">&#39;#a0e08c&#39;</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">sql</span><span class="p">,</span>
<span class="n">bucket</span><span class="p">,</span>
<span class="n">filename</span><span class="p">,</span>
<span class="n">schema_filename</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span>
<span class="n">approx_max_file_size_bytes</span><span class="o">=</span><span class="mi">1900000000</span><span class="p">,</span>
<span class="n">mysql_conn_id</span><span class="o">=</span><span class="s1">&#39;mysql_default&#39;</span><span class="p">,</span>
<span class="n">google_cloud_storage_conn_id</span><span class="o">=</span><span class="s1">&#39;google_cloud_default&#39;</span><span class="p">,</span>
<span class="n">schema</span><span class="o">=</span><span class="kc">None</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="n">export_format</span><span class="o">=</span><span class="s1">&#39;json&#39;</span><span class="p">,</span>
<span class="n">field_delimiter</span><span class="o">=</span><span class="s1">&#39;,&#39;</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">MySqlToGoogleCloudStorageOperator</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">sql</span> <span class="o">=</span> <span class="n">sql</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">filename</span> <span class="o">=</span> <span class="n">filename</span>
<span class="bp">self</span><span class="o">.</span><span class="n">schema_filename</span> <span class="o">=</span> <span class="n">schema_filename</span>
<span class="bp">self</span><span class="o">.</span><span class="n">approx_max_file_size_bytes</span> <span class="o">=</span> <span class="n">approx_max_file_size_bytes</span>
<span class="bp">self</span><span class="o">.</span><span class="n">mysql_conn_id</span> <span class="o">=</span> <span class="n">mysql_conn_id</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">schema</span> <span class="o">=</span> <span class="n">schema</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="bp">self</span><span class="o">.</span><span class="n">export_format</span> <span class="o">=</span> <span class="n">export_format</span><span class="o">.</span><span class="n">lower</span><span class="p">()</span>
<span class="bp">self</span><span class="o">.</span><span class="n">field_delimiter</span> <span class="o">=</span> <span class="n">field_delimiter</span>
<div class="viewcode-block" id="MySqlToGoogleCloudStorageOperator.execute"><a class="viewcode-back" href="../../../../_api/airflow/contrib/operators/mysql_to_gcs/index.html#airflow.contrib.operators.mysql_to_gcs.MySqlToGoogleCloudStorageOperator.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="n">cursor</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_query_mysql</span><span class="p">()</span>
<span class="n">files_to_upload</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_write_local_data_files</span><span class="p">(</span><span class="n">cursor</span><span class="p">)</span>
<span class="c1"># If a schema is set, create a BQ schema JSON file.</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">schema_filename</span><span class="p">:</span>
<span class="n">files_to_upload</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_write_local_schema_file</span><span class="p">(</span><span class="n">cursor</span><span class="p">))</span>
<span class="c1"># Flush all files before uploading.</span>
<span class="k">for</span> <span class="n">tmp_file</span> <span class="ow">in</span> <span class="n">files_to_upload</span><span class="p">:</span>
<span class="n">tmp_file_handle</span> <span class="o">=</span> <span class="n">tmp_file</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">&#39;file_handle&#39;</span><span class="p">)</span>
<span class="n">tmp_file_handle</span><span class="o">.</span><span class="n">flush</span><span class="p">()</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_upload_to_gcs</span><span class="p">(</span><span class="n">files_to_upload</span><span class="p">)</span>
<span class="c1"># Close all temp file handles.</span>
<span class="k">for</span> <span class="n">tmp_file</span> <span class="ow">in</span> <span class="n">files_to_upload</span><span class="p">:</span>
<span class="n">tmp_file_handle</span> <span class="o">=</span> <span class="n">tmp_file</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">&#39;file_handle&#39;</span><span class="p">)</span>
<span class="n">tmp_file_handle</span><span class="o">.</span><span class="n">close</span><span class="p">()</span></div>
<div class="viewcode-block" id="MySqlToGoogleCloudStorageOperator._query_mysql"><a class="viewcode-back" href="../../../../_api/airflow/contrib/operators/mysql_to_gcs/index.html#airflow.contrib.operators.mysql_to_gcs.MySqlToGoogleCloudStorageOperator._query_mysql">[docs]</a> <span class="k">def</span> <span class="nf">_query_mysql</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Queries mysql and returns a cursor to the results.</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="n">mysql</span> <span class="o">=</span> <span class="n">MySqlHook</span><span class="p">(</span><span class="n">mysql_conn_id</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">mysql_conn_id</span><span class="p">)</span>
<span class="n">conn</span> <span class="o">=</span> <span class="n">mysql</span><span class="o">.</span><span class="n">get_conn</span><span class="p">()</span>
<span class="n">cursor</span> <span class="o">=</span> <span class="n">conn</span><span class="o">.</span><span class="n">cursor</span><span class="p">()</span>
<span class="n">cursor</span><span class="o">.</span><span class="n">execute</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">sql</span><span class="p">)</span>
<span class="k">return</span> <span class="n">cursor</span></div>
<div class="viewcode-block" id="MySqlToGoogleCloudStorageOperator._write_local_data_files"><a class="viewcode-back" href="../../../../_api/airflow/contrib/operators/mysql_to_gcs/index.html#airflow.contrib.operators.mysql_to_gcs.MySqlToGoogleCloudStorageOperator._write_local_data_files">[docs]</a> <span class="k">def</span> <span class="nf">_write_local_data_files</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">cursor</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Takes a cursor, and writes results to a local file.</span>
<span class="sd"> :return: A dictionary where keys are filenames to be used as object</span>
<span class="sd"> names in GCS, and values are file handles to local files that</span>
<span class="sd"> contain the data for the GCS objects.</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="n">schema</span> <span class="o">=</span> <span class="nb">list</span><span class="p">(</span><span class="nb">map</span><span class="p">(</span><span class="k">lambda</span> <span class="n">schema_tuple</span><span class="p">:</span> <span class="n">schema_tuple</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span> <span class="n">cursor</span><span class="o">.</span><span class="n">description</span><span class="p">))</span>
<span class="n">col_type_dict</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_get_col_type_dict</span><span class="p">()</span>
<span class="n">file_no</span> <span class="o">=</span> <span class="mi">0</span>
<span class="n">tmp_file_handle</span> <span class="o">=</span> <span class="n">NamedTemporaryFile</span><span class="p">(</span><span class="n">delete</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">export_format</span> <span class="o">==</span> <span class="s1">&#39;csv&#39;</span><span class="p">:</span>
<span class="n">file_mime_type</span> <span class="o">=</span> <span class="s1">&#39;text/csv&#39;</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">file_mime_type</span> <span class="o">=</span> <span class="s1">&#39;application/json&#39;</span>
<span class="n">files_to_upload</span> <span class="o">=</span> <span class="p">[{</span>
<span class="s1">&#39;file_name&#39;</span><span class="p">:</span> <span class="bp">self</span><span class="o">.</span><span class="n">filename</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">file_no</span><span class="p">),</span>
<span class="s1">&#39;file_handle&#39;</span><span class="p">:</span> <span class="n">tmp_file_handle</span><span class="p">,</span>
<span class="s1">&#39;file_mime_type&#39;</span><span class="p">:</span> <span class="n">file_mime_type</span>
<span class="p">}]</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">export_format</span> <span class="o">==</span> <span class="s1">&#39;csv&#39;</span><span class="p">:</span>
<span class="n">csv_writer</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_configure_csv_file</span><span class="p">(</span><span class="n">tmp_file_handle</span><span class="p">,</span> <span class="n">schema</span><span class="p">)</span>
<span class="k">for</span> <span class="n">row</span> <span class="ow">in</span> <span class="n">cursor</span><span class="p">:</span>
<span class="c1"># Convert datetime objects to utc seconds, and decimals to floats.</span>
<span class="c1"># Convert binary type object to string encoded with base64.</span>
<span class="n">row</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_convert_types</span><span class="p">(</span><span class="n">schema</span><span class="p">,</span> <span class="n">col_type_dict</span><span class="p">,</span> <span class="n">row</span><span class="p">)</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">export_format</span> <span class="o">==</span> <span class="s1">&#39;csv&#39;</span><span class="p">:</span>
<span class="n">csv_writer</span><span class="o">.</span><span class="n">writerow</span><span class="p">(</span><span class="n">row</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">row_dict</span> <span class="o">=</span> <span class="nb">dict</span><span class="p">(</span><span class="nb">zip</span><span class="p">(</span><span class="n">schema</span><span class="p">,</span> <span class="n">row</span><span class="p">))</span>
<span class="c1"># TODO validate that row isn&#39;t &gt; 2MB. BQ enforces a hard row size of 2MB.</span>
<span class="n">s</span> <span class="o">=</span> <span class="n">json</span><span class="o">.</span><span class="n">dumps</span><span class="p">(</span><span class="n">row_dict</span><span class="p">,</span> <span class="n">sort_keys</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
<span class="k">if</span> <span class="n">PY3</span><span class="p">:</span>
<span class="n">s</span> <span class="o">=</span> <span class="n">s</span><span class="o">.</span><span class="n">encode</span><span class="p">(</span><span class="s1">&#39;utf-8&#39;</span><span class="p">)</span>
<span class="n">tmp_file_handle</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">s</span><span class="p">)</span>
<span class="c1"># Append newline to make dumps BigQuery compatible.</span>
<span class="n">tmp_file_handle</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="sa">b</span><span class="s1">&#39;</span><span class="se">\n</span><span class="s1">&#39;</span><span class="p">)</span>
<span class="c1"># Stop if the file exceeds the file size limit.</span>
<span class="k">if</span> <span class="n">tmp_file_handle</span><span class="o">.</span><span class="n">tell</span><span class="p">()</span> <span class="o">&gt;=</span> <span class="bp">self</span><span class="o">.</span><span class="n">approx_max_file_size_bytes</span><span class="p">:</span>
<span class="n">file_no</span> <span class="o">+=</span> <span class="mi">1</span>
<span class="n">tmp_file_handle</span> <span class="o">=</span> <span class="n">NamedTemporaryFile</span><span class="p">(</span><span class="n">delete</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
<span class="n">files_to_upload</span><span class="o">.</span><span class="n">append</span><span class="p">({</span>
<span class="s1">&#39;file_name&#39;</span><span class="p">:</span> <span class="bp">self</span><span class="o">.</span><span class="n">filename</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">file_no</span><span class="p">),</span>
<span class="s1">&#39;file_handle&#39;</span><span class="p">:</span> <span class="n">tmp_file_handle</span><span class="p">,</span>
<span class="s1">&#39;file_mime_type&#39;</span><span class="p">:</span> <span class="n">file_mime_type</span>
<span class="p">})</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">export_format</span> <span class="o">==</span> <span class="s1">&#39;csv&#39;</span><span class="p">:</span>
<span class="n">csv_writer</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_configure_csv_file</span><span class="p">(</span><span class="n">tmp_file_handle</span><span class="p">,</span> <span class="n">schema</span><span class="p">)</span>
<span class="k">return</span> <span class="n">files_to_upload</span></div>
<div class="viewcode-block" id="MySqlToGoogleCloudStorageOperator._configure_csv_file"><a class="viewcode-back" href="../../../../_api/airflow/contrib/operators/mysql_to_gcs/index.html#airflow.contrib.operators.mysql_to_gcs.MySqlToGoogleCloudStorageOperator._configure_csv_file">[docs]</a> <span class="k">def</span> <span class="nf">_configure_csv_file</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">file_handle</span><span class="p">,</span> <span class="n">schema</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;Configure a csv writer with the file_handle and write schema</span>
<span class="sd"> as headers for the new file.</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="n">csv_writer</span> <span class="o">=</span> <span class="n">csv</span><span class="o">.</span><span class="n">writer</span><span class="p">(</span><span class="n">file_handle</span><span class="p">,</span> <span class="n">encoding</span><span class="o">=</span><span class="s1">&#39;utf-8&#39;</span><span class="p">,</span>
<span class="n">delimiter</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">field_delimiter</span><span class="p">)</span>
<span class="n">csv_writer</span><span class="o">.</span><span class="n">writerow</span><span class="p">(</span><span class="n">schema</span><span class="p">)</span>
<span class="k">return</span> <span class="n">csv_writer</span></div>
<div class="viewcode-block" id="MySqlToGoogleCloudStorageOperator._write_local_schema_file"><a class="viewcode-back" href="../../../../_api/airflow/contrib/operators/mysql_to_gcs/index.html#airflow.contrib.operators.mysql_to_gcs.MySqlToGoogleCloudStorageOperator._write_local_schema_file">[docs]</a> <span class="k">def</span> <span class="nf">_write_local_schema_file</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">cursor</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Takes a cursor, and writes the BigQuery schema in .json format for the</span>
<span class="sd"> results to a local file system.</span>
<span class="sd"> :return: A dictionary where key is a filename to be used as an object</span>
<span class="sd"> name in GCS, and values are file handles to local files that</span>
<span class="sd"> contains the BigQuery schema fields in .json format.</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="n">schema_str</span> <span class="o">=</span> <span class="kc">None</span>
<span class="n">schema_file_mime_type</span> <span class="o">=</span> <span class="s1">&#39;application/json&#39;</span>
<span class="n">tmp_schema_file_handle</span> <span class="o">=</span> <span class="n">NamedTemporaryFile</span><span class="p">(</span><span class="n">delete</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">schema</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span> <span class="ow">and</span> <span class="nb">isinstance</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">schema</span><span class="p">,</span> <span class="n">string_types</span><span class="p">):</span>
<span class="n">schema_str</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">schema</span>
<span class="k">elif</span> <span class="bp">self</span><span class="o">.</span><span class="n">schema</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span> <span class="ow">and</span> <span class="nb">isinstance</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">schema</span><span class="p">,</span> <span class="nb">list</span><span class="p">):</span>
<span class="n">schema_str</span> <span class="o">=</span> <span class="n">json</span><span class="o">.</span><span class="n">dumps</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">schema</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">schema</span> <span class="o">=</span> <span class="p">[]</span>
<span class="k">for</span> <span class="n">field</span> <span class="ow">in</span> <span class="n">cursor</span><span class="o">.</span><span class="n">description</span><span class="p">:</span>
<span class="c1"># See PEP 249 for details about the description tuple.</span>
<span class="n">field_name</span> <span class="o">=</span> <span class="n">field</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
<span class="n">field_type</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">type_map</span><span class="p">(</span><span class="n">field</span><span class="p">[</span><span class="mi">1</span><span class="p">])</span>
<span class="c1"># Always allow TIMESTAMP to be nullable. MySQLdb returns None types</span>
<span class="c1"># for required fields because some MySQL timestamps can&#39;t be</span>
<span class="c1"># represented by Python&#39;s datetime (e.g. 0000-00-00 00:00:00).</span>
<span class="k">if</span> <span class="n">field</span><span class="p">[</span><span class="mi">6</span><span class="p">]</span> <span class="ow">or</span> <span class="n">field_type</span> <span class="o">==</span> <span class="s1">&#39;TIMESTAMP&#39;</span><span class="p">:</span>
<span class="n">field_mode</span> <span class="o">=</span> <span class="s1">&#39;NULLABLE&#39;</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">field_mode</span> <span class="o">=</span> <span class="s1">&#39;REQUIRED&#39;</span>
<span class="n">schema</span><span class="o">.</span><span class="n">append</span><span class="p">({</span>
<span class="s1">&#39;name&#39;</span><span class="p">:</span> <span class="n">field_name</span><span class="p">,</span>
<span class="s1">&#39;type&#39;</span><span class="p">:</span> <span class="n">field_type</span><span class="p">,</span>
<span class="s1">&#39;mode&#39;</span><span class="p">:</span> <span class="n">field_mode</span><span class="p">,</span>
<span class="p">})</span>
<span class="n">schema_str</span> <span class="o">=</span> <span class="n">json</span><span class="o">.</span><span class="n">dumps</span><span class="p">(</span><span class="n">schema</span><span class="p">,</span> <span class="n">sort_keys</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
<span class="k">if</span> <span class="n">PY3</span><span class="p">:</span>
<span class="n">schema_str</span> <span class="o">=</span> <span class="n">schema_str</span><span class="o">.</span><span class="n">encode</span><span class="p">(</span><span class="s1">&#39;utf-8&#39;</span><span class="p">)</span>
<span class="n">tmp_schema_file_handle</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">schema_str</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;Using schema for </span><span class="si">%s</span><span class="s1">: </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">schema_filename</span><span class="p">,</span> <span class="n">schema_str</span><span class="p">)</span>
<span class="n">schema_file_to_upload</span> <span class="o">=</span> <span class="p">{</span>
<span class="s1">&#39;file_name&#39;</span><span class="p">:</span> <span class="bp">self</span><span class="o">.</span><span class="n">schema_filename</span><span class="p">,</span>
<span class="s1">&#39;file_handle&#39;</span><span class="p">:</span> <span class="n">tmp_schema_file_handle</span><span class="p">,</span>
<span class="s1">&#39;file_mime_type&#39;</span><span class="p">:</span> <span class="n">schema_file_mime_type</span>
<span class="p">}</span>
<span class="k">return</span> <span class="n">schema_file_to_upload</span></div>
<div class="viewcode-block" id="MySqlToGoogleCloudStorageOperator._upload_to_gcs"><a class="viewcode-back" href="../../../../_api/airflow/contrib/operators/mysql_to_gcs/index.html#airflow.contrib.operators.mysql_to_gcs.MySqlToGoogleCloudStorageOperator._upload_to_gcs">[docs]</a> <span class="k">def</span> <span class="nf">_upload_to_gcs</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">files_to_upload</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Upload all of the file splits (and optionally the schema .json file) to</span>
<span class="sd"> Google cloud storage.</span>
<span class="sd"> &quot;&quot;&quot;</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="k">for</span> <span class="n">tmp_file</span> <span class="ow">in</span> <span class="n">files_to_upload</span><span class="p">:</span>
<span class="n">hook</span><span class="o">.</span><span class="n">upload</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="n">tmp_file</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">&#39;file_name&#39;</span><span class="p">),</span>
<span class="n">tmp_file</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">&#39;file_handle&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">name</span><span class="p">,</span>
<span class="n">mime_type</span><span class="o">=</span><span class="n">tmp_file</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">&#39;file_mime_type&#39;</span><span class="p">))</span></div>
<span class="nd">@staticmethod</span>
<div class="viewcode-block" id="MySqlToGoogleCloudStorageOperator._convert_types"><a class="viewcode-back" href="../../../../_api/airflow/contrib/operators/mysql_to_gcs/index.html#airflow.contrib.operators.mysql_to_gcs.MySqlToGoogleCloudStorageOperator._convert_types">[docs]</a> <span class="k">def</span> <span class="nf">_convert_types</span><span class="p">(</span><span class="n">schema</span><span class="p">,</span> <span class="n">col_type_dict</span><span class="p">,</span> <span class="n">row</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Takes a value from MySQLdb, and converts it to a value that&#39;s safe for</span>
<span class="sd"> JSON/Google cloud storage/BigQuery. Dates are converted to UTC seconds.</span>
<span class="sd"> Decimals are converted to floats. Binary type fields are encoded with base64,</span>
<span class="sd"> as imported BYTES data must be base64-encoded according to Bigquery SQL</span>
<span class="sd"> date type documentation: https://cloud.google.com/bigquery/data-types</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="n">converted_row</span> <span class="o">=</span> <span class="p">[]</span>
<span class="k">for</span> <span class="n">col_name</span><span class="p">,</span> <span class="n">col_val</span> <span class="ow">in</span> <span class="nb">zip</span><span class="p">(</span><span class="n">schema</span><span class="p">,</span> <span class="n">row</span><span class="p">):</span>
<span class="k">if</span> <span class="nb">type</span><span class="p">(</span><span class="n">col_val</span><span class="p">)</span> <span class="ow">in</span> <span class="p">(</span><span class="n">datetime</span><span class="p">,</span> <span class="n">date</span><span class="p">):</span>
<span class="n">col_val</span> <span class="o">=</span> <span class="n">time</span><span class="o">.</span><span class="n">mktime</span><span class="p">(</span><span class="n">col_val</span><span class="o">.</span><span class="n">timetuple</span><span class="p">())</span>
<span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">col_val</span><span class="p">,</span> <span class="n">Decimal</span><span class="p">):</span>
<span class="n">col_val</span> <span class="o">=</span> <span class="nb">float</span><span class="p">(</span><span class="n">col_val</span><span class="p">)</span>
<span class="k">elif</span> <span class="n">col_type_dict</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">col_name</span><span class="p">)</span> <span class="o">==</span> <span class="s2">&quot;BYTES&quot;</span><span class="p">:</span>
<span class="n">col_val</span> <span class="o">=</span> <span class="n">base64</span><span class="o">.</span><span class="n">standard_b64encode</span><span class="p">(</span><span class="n">col_val</span><span class="p">)</span>
<span class="k">if</span> <span class="n">PY3</span><span class="p">:</span>
<span class="n">col_val</span> <span class="o">=</span> <span class="n">col_val</span><span class="o">.</span><span class="n">decode</span><span class="p">(</span><span class="s1">&#39;ascii&#39;</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">col_val</span> <span class="o">=</span> <span class="n">col_val</span>
<span class="n">converted_row</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">col_val</span><span class="p">)</span>
<span class="k">return</span> <span class="n">converted_row</span></div>
<div class="viewcode-block" id="MySqlToGoogleCloudStorageOperator._get_col_type_dict"><a class="viewcode-back" href="../../../../_api/airflow/contrib/operators/mysql_to_gcs/index.html#airflow.contrib.operators.mysql_to_gcs.MySqlToGoogleCloudStorageOperator._get_col_type_dict">[docs]</a> <span class="k">def</span> <span class="nf">_get_col_type_dict</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Return a dict of column name and column type based on self.schema if not None.</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="n">schema</span> <span class="o">=</span> <span class="p">[]</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">schema</span><span class="p">,</span> <span class="n">string_types</span><span class="p">):</span>
<span class="n">schema</span> <span class="o">=</span> <span class="n">json</span><span class="o">.</span><span class="n">loads</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">schema</span><span class="p">)</span>
<span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">schema</span><span class="p">,</span> <span class="nb">list</span><span class="p">):</span>
<span class="n">schema</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">schema</span>
<span class="k">elif</span> <span class="bp">self</span><span class="o">.</span><span class="n">schema</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</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">warn</span><span class="p">(</span><span class="s1">&#39;Using default schema due to unexpected type.&#39;</span>
<span class="s1">&#39;Should be a string or list.&#39;</span><span class="p">)</span>
<span class="n">col_type_dict</span> <span class="o">=</span> <span class="p">{}</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">col_type_dict</span> <span class="o">=</span> <span class="p">{</span><span class="n">col</span><span class="p">[</span><span class="s1">&#39;name&#39;</span><span class="p">]:</span> <span class="n">col</span><span class="p">[</span><span class="s1">&#39;type&#39;</span><span class="p">]</span> <span class="k">for</span> <span class="n">col</span> <span class="ow">in</span> <span class="n">schema</span><span class="p">}</span>
<span class="k">except</span> <span class="ne">KeyError</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">warn</span><span class="p">(</span><span class="s1">&#39;Using default schema due to missing name or type. Please &#39;</span>
<span class="s1">&#39;refer to: https://cloud.google.com/bigquery/docs/schemas&#39;</span>
<span class="s1">&#39;#specifying_a_json_schema_file&#39;</span><span class="p">)</span>
<span class="k">return</span> <span class="n">col_type_dict</span></div>
<span class="nd">@classmethod</span>
<div class="viewcode-block" id="MySqlToGoogleCloudStorageOperator.type_map"><a class="viewcode-back" href="../../../../_api/airflow/contrib/operators/mysql_to_gcs/index.html#airflow.contrib.operators.mysql_to_gcs.MySqlToGoogleCloudStorageOperator.type_map">[docs]</a> <span class="k">def</span> <span class="nf">type_map</span><span class="p">(</span><span class="bp">cls</span><span class="p">,</span> <span class="n">mysql_type</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Helper function that maps from MySQL fields to BigQuery fields. Used</span>
<span class="sd"> when a schema_filename is set.</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="n">d</span> <span class="o">=</span> <span class="p">{</span>
<span class="n">FIELD_TYPE</span><span class="o">.</span><span class="n">INT24</span><span class="p">:</span> <span class="s1">&#39;INTEGER&#39;</span><span class="p">,</span>
<span class="n">FIELD_TYPE</span><span class="o">.</span><span class="n">TINY</span><span class="p">:</span> <span class="s1">&#39;INTEGER&#39;</span><span class="p">,</span>
<span class="n">FIELD_TYPE</span><span class="o">.</span><span class="n">BIT</span><span class="p">:</span> <span class="s1">&#39;INTEGER&#39;</span><span class="p">,</span>
<span class="n">FIELD_TYPE</span><span class="o">.</span><span class="n">DATETIME</span><span class="p">:</span> <span class="s1">&#39;TIMESTAMP&#39;</span><span class="p">,</span>
<span class="n">FIELD_TYPE</span><span class="o">.</span><span class="n">DATE</span><span class="p">:</span> <span class="s1">&#39;TIMESTAMP&#39;</span><span class="p">,</span>
<span class="n">FIELD_TYPE</span><span class="o">.</span><span class="n">DECIMAL</span><span class="p">:</span> <span class="s1">&#39;FLOAT&#39;</span><span class="p">,</span>
<span class="n">FIELD_TYPE</span><span class="o">.</span><span class="n">NEWDECIMAL</span><span class="p">:</span> <span class="s1">&#39;FLOAT&#39;</span><span class="p">,</span>
<span class="n">FIELD_TYPE</span><span class="o">.</span><span class="n">DOUBLE</span><span class="p">:</span> <span class="s1">&#39;FLOAT&#39;</span><span class="p">,</span>
<span class="n">FIELD_TYPE</span><span class="o">.</span><span class="n">FLOAT</span><span class="p">:</span> <span class="s1">&#39;FLOAT&#39;</span><span class="p">,</span>
<span class="n">FIELD_TYPE</span><span class="o">.</span><span class="n">LONG</span><span class="p">:</span> <span class="s1">&#39;INTEGER&#39;</span><span class="p">,</span>
<span class="n">FIELD_TYPE</span><span class="o">.</span><span class="n">LONGLONG</span><span class="p">:</span> <span class="s1">&#39;INTEGER&#39;</span><span class="p">,</span>
<span class="n">FIELD_TYPE</span><span class="o">.</span><span class="n">SHORT</span><span class="p">:</span> <span class="s1">&#39;INTEGER&#39;</span><span class="p">,</span>
<span class="n">FIELD_TYPE</span><span class="o">.</span><span class="n">TIMESTAMP</span><span class="p">:</span> <span class="s1">&#39;TIMESTAMP&#39;</span><span class="p">,</span>
<span class="n">FIELD_TYPE</span><span class="o">.</span><span class="n">YEAR</span><span class="p">:</span> <span class="s1">&#39;INTEGER&#39;</span><span class="p">,</span>
<span class="p">}</span>
<span class="k">return</span> <span class="n">d</span><span class="p">[</span><span class="n">mysql_type</span><span class="p">]</span> <span class="k">if</span> <span class="n">mysql_type</span> <span class="ow">in</span> <span class="n">d</span> <span class="k">else</span> <span class="s1">&#39;STRING&#39;</span></div></div>
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