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   <h1>Source code for airflow.contrib.operators.s3_to_gcs_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"># &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">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">airflow.contrib.hooks.gcs_hook</span> <span class="k">import</span> <span class="p">(</span><span class="n">GoogleCloudStorageHook</span><span class="p">,</span>
                                             <span class="n">_parse_gcs_url</span><span class="p">)</span>
 <span class="kn">from</span> <span class="nn">airflow.contrib.operators.s3_list_operator</span> <span class="k">import</span> <span class="n">S3ListOperator</span>
 <span class="kn">from</span> <span class="nn">airflow.exceptions</span> <span class="k">import</span> <span class="n">AirflowException</span>
 <span class="kn">from</span> <span class="nn">airflow.hooks.S3_hook</span> <span class="k">import</span> <span class="n">S3Hook</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="S3ToGoogleCloudStorageOperator"><a class="viewcode-back" href="../../../../integration.html#airflow.contrib.operators.s3_to_gcs_operator.S3ToGoogleCloudStorageOperator">[docs]</a><span class="k">class</span> <span class="nc">S3ToGoogleCloudStorageOperator</span><span class="p">(</span><span class="n">S3ListOperator</span><span class="p">):</span>
     <span class="sd">&quot;&quot;&quot;</span>
 <span class="sd">    Synchronizes an S3 key, possibly a prefix, with a Google Cloud Storage</span>
 <span class="sd">    destination path.</span>

 <span class="sd">    :param bucket: The S3 bucket where to find the objects. (templated)</span>
 <span class="sd">    :type bucket: string</span>
 <span class="sd">    :param prefix: Prefix string which filters objects whose name begin with</span>
 <span class="sd">        such prefix. (templated)</span>
 <span class="sd">    :type prefix: string</span>
 <span class="sd">    :param delimiter: the delimiter marks key hierarchy. (templated)</span>
 <span class="sd">    :type delimiter: string</span>
 <span class="sd">    :param aws_conn_id: The source S3 connection</span>
 <span class="sd">    :type aws_conn_id: string</span>
 <span class="sd">    :param dest_gcs_conn_id: The destination connection ID to use</span>
 <span class="sd">        when connecting to Google Cloud Storage.</span>
 <span class="sd">    :type dest_gcs_conn_id: string</span>
 <span class="sd">    :param dest_gcs: The destination Google Cloud Storage bucket and prefix</span>
 <span class="sd">        where you want to store the files. (templated)</span>
 <span class="sd">    :type dest_gcs: 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">    :param replace: Whether you want to replace existing destination files</span>
 <span class="sd">        or not.</span>
 <span class="sd">    :type replace: bool</span>


 <span class="sd">    **Example**:</span>
 <span class="sd">    .. code-block:: python</span>
 <span class="sd">       s3_to_gcs_op = S3ToGoogleCloudStorageOperator(</span>
 <span class="sd">            task_id=&#39;s3_to_gcs_example&#39;,</span>
 <span class="sd">            bucket=&#39;my-s3-bucket&#39;,</span>
 <span class="sd">            prefix=&#39;data/customers-201804&#39;,</span>
 <span class="sd">            dest_gcs_conn_id=&#39;google_cloud_default&#39;,</span>
 <span class="sd">            dest_gcs=&#39;gs://my.gcs.bucket/some/customers/&#39;,</span>
 <span class="sd">            replace=False,</span>
 <span class="sd">            dag=my-dag)</span>

 <span class="sd">    Note that ``bucket``, ``prefix``, ``delimiter`` and ``dest_gcs`` are</span>
 <span class="sd">    templated, so you can use variables in them if you wish.</span>
 <span class="sd">    &quot;&quot;&quot;</span>

     <span class="n">template_fields</span> <span class="o">=</span> <span class="p">(</span><span class="s1">&#39;bucket&#39;</span><span class="p">,</span> <span class="s1">&#39;prefix&#39;</span><span class="p">,</span> <span class="s1">&#39;delimiter&#39;</span><span class="p">,</span> <span class="s1">&#39;dest_gcs&#39;</span><span class="p">)</span>
     <span class="n">ui_color</span> <span class="o">=</span> <span class="s1">&#39;#e09411&#39;</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="n">prefix</span><span class="o">=</span><span class="s1">&#39;&#39;</span><span class="p">,</span>
                  <span class="n">delimiter</span><span class="o">=</span><span class="s1">&#39;&#39;</span><span class="p">,</span>
                  <span class="n">aws_conn_id</span><span class="o">=</span><span class="s1">&#39;aws_default&#39;</span><span class="p">,</span>
                  <span class="n">dest_gcs_conn_id</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span>
                  <span class="n">dest_gcs</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">replace</span><span class="o">=</span><span class="kc">False</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">S3ToGoogleCloudStorageOperator</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="n">bucket</span><span class="o">=</span><span class="n">bucket</span><span class="p">,</span>
             <span class="n">prefix</span><span class="o">=</span><span class="n">prefix</span><span class="p">,</span>
             <span class="n">delimiter</span><span class="o">=</span><span class="n">delimiter</span><span class="p">,</span>
             <span class="n">aws_conn_id</span><span class="o">=</span><span class="n">aws_conn_id</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">dest_gcs_conn_id</span> <span class="o">=</span> <span class="n">dest_gcs_conn_id</span>
         <span class="bp">self</span><span class="o">.</span><span class="n">dest_gcs</span> <span class="o">=</span> <span class="n">dest_gcs</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">replace</span> <span class="o">=</span> <span class="n">replace</span>

         <span class="k">if</span> <span class="n">dest_gcs</span> <span class="ow">and</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">_gcs_object_is_directory</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">dest_gcs</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;Destination Google Cloud Storage path is not a valid &#39;</span>
                 <span class="s1">&#39;&quot;directory&quot;, define a path that ends with a slash &quot;/&quot; or &#39;</span>
                 <span class="s1">&#39;leave it empty for the root of the bucket.&#39;</span><span class="p">)</span>
             <span class="k">raise</span> <span class="n">AirflowException</span><span class="p">(</span><span class="s1">&#39;The destination Google Cloud Storage path &#39;</span>
                                    <span class="s1">&#39;must end with a slash &quot;/&quot; or be empty.&#39;</span><span class="p">)</span>

 <div class="viewcode-block" id="S3ToGoogleCloudStorageOperator.execute"><a class="viewcode-back" href="../../../../integration.html#airflow.contrib.operators.s3_to_gcs_operator.S3ToGoogleCloudStorageOperator.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"># use the super method to list all the files in an S3 bucket/key</span>
         <span class="n">files</span> <span class="o">=</span> <span class="nb">super</span><span class="p">(</span><span class="n">S3ToGoogleCloudStorageOperator</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">execute</span><span class="p">(</span><span class="n">context</span><span class="p">)</span>

         <span class="n">gcs_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">dest_gcs_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">if</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">replace</span><span class="p">:</span>
             <span class="c1"># if we are not replacing -&gt; list all files in the GCS bucket</span>
             <span class="c1"># and only keep those files which are present in</span>
             <span class="c1"># S3 and not in Google Cloud Storage</span>
             <span class="n">bucket_name</span><span class="p">,</span> <span class="n">object_prefix</span> <span class="o">=</span> <span class="n">_parse_gcs_url</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">dest_gcs</span><span class="p">)</span>
             <span class="n">existing_files_prefixed</span> <span class="o">=</span> <span class="n">gcs_hook</span><span class="o">.</span><span class="n">list</span><span class="p">(</span>
                 <span class="n">bucket_name</span><span class="p">,</span> <span class="n">prefix</span><span class="o">=</span><span class="n">object_prefix</span><span class="p">)</span>

             <span class="n">existing_files</span> <span class="o">=</span> <span class="p">[]</span>

             <span class="k">if</span> <span class="n">existing_files_prefixed</span><span class="p">:</span>
                 <span class="c1"># Remove the object prefix itself, an empty directory was found</span>
                 <span class="k">if</span> <span class="n">object_prefix</span> <span class="ow">in</span> <span class="n">existing_files_prefixed</span><span class="p">:</span>
                     <span class="n">existing_files_prefixed</span><span class="o">.</span><span class="n">remove</span><span class="p">(</span><span class="n">object_prefix</span><span class="p">)</span>

                 <span class="c1"># Remove the object prefix from all object string paths</span>
                 <span class="k">for</span> <span class="n">f</span> <span class="ow">in</span> <span class="n">existing_files_prefixed</span><span class="p">:</span>
                     <span class="k">if</span> <span class="n">f</span><span class="o">.</span><span class="n">startswith</span><span class="p">(</span><span class="n">object_prefix</span><span class="p">):</span>
                         <span class="n">existing_files</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">f</span><span class="p">[</span><span class="nb">len</span><span class="p">(</span><span class="n">object_prefix</span><span class="p">):])</span>
                     <span class="k">else</span><span class="p">:</span>
                         <span class="n">existing_files</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">f</span><span class="p">)</span>

             <span class="n">files</span> <span class="o">=</span> <span class="nb">set</span><span class="p">(</span><span class="n">files</span><span class="p">)</span> <span class="o">-</span> <span class="nb">set</span><span class="p">(</span><span class="n">existing_files</span><span class="p">)</span>
             <span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">files</span><span class="p">)</span> <span class="o">&gt;</span> <span class="mi">0</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;</span><span class="si">{0}</span><span class="s1"> files are going to be synced: </span><span class="si">{1}</span><span class="s1">.&#39;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span>
                     <span class="nb">len</span><span class="p">(</span><span class="n">files</span><span class="p">),</span> <span class="n">files</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">&#39;There are no new files to sync. Have a nice day!&#39;</span><span class="p">)</span>

         <span class="k">if</span> <span class="n">files</span><span class="p">:</span>
             <span class="n">hook</span> <span class="o">=</span> <span class="n">S3Hook</span><span class="p">(</span><span class="n">aws_conn_id</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">aws_conn_id</span><span class="p">)</span>

             <span class="k">for</span> <span class="n">file</span> <span class="ow">in</span> <span class="n">files</span><span class="p">:</span>
                 <span class="c1"># GCS hook builds its own in-memory file so we have to create</span>
                 <span class="c1"># and pass the path</span>
                 <span class="n">file_object</span> <span class="o">=</span> <span class="n">hook</span><span class="o">.</span><span class="n">get_key</span><span class="p">(</span><span class="n">file</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="k">with</span> <span class="n">NamedTemporaryFile</span><span class="p">(</span><span class="n">mode</span><span class="o">=</span><span class="s1">&#39;wb&#39;</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">as</span> <span class="n">f</span><span class="p">:</span>
                     <span class="n">file_object</span><span class="o">.</span><span class="n">download_fileobj</span><span class="p">(</span><span class="n">f</span><span class="p">)</span>
                     <span class="n">f</span><span class="o">.</span><span class="n">flush</span><span class="p">()</span>

                     <span class="n">dest_gcs_bucket</span><span class="p">,</span> <span class="n">dest_gcs_object_prefix</span> <span class="o">=</span> <span class="n">_parse_gcs_url</span><span class="p">(</span>
                         <span class="bp">self</span><span class="o">.</span><span class="n">dest_gcs</span><span class="p">)</span>
                     <span class="c1"># There will always be a &#39;/&#39; before file because it is</span>
                     <span class="c1"># enforced at instantiation time</span>
                     <span class="n">dest_gcs_object</span> <span class="o">=</span> <span class="n">dest_gcs_object_prefix</span> <span class="o">+</span> <span class="n">file</span>

                     <span class="c1"># Sync is sequential and the hook already logs too much</span>
                     <span class="c1"># so skip this for now</span>
                     <span class="c1"># self.log.info(</span>
                     <span class="c1">#     &#39;Saving file {0} from S3 bucket {1} in GCS bucket {2}&#39;</span>
                     <span class="c1">#     &#39; as object {3}&#39;.format(file, self.bucket,</span>
                     <span class="c1">#                             dest_gcs_bucket,</span>
                     <span class="c1">#                             dest_gcs_object))</span>

                     <span class="n">gcs_hook</span><span class="o">.</span><span class="n">upload</span><span class="p">(</span><span class="n">dest_gcs_bucket</span><span class="p">,</span> <span class="n">dest_gcs_object</span><span class="p">,</span> <span class="n">f</span><span class="o">.</span><span class="n">name</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">&quot;All done, uploaded </span><span class="si">%d</span><span class="s2"> files to Google Cloud Storage&quot;</span><span class="p">,</span>
                 <span class="nb">len</span><span class="p">(</span><span class="n">files</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">&#39;In sync, no files needed to be uploaded to Google Cloud&#39;</span>
                 <span class="s1">&#39;Storage&#39;</span><span class="p">)</span>

         <span class="k">return</span> <span class="n">files</span></div>

     <span class="c1"># Following functionality may be better suited in</span>
     <span class="c1"># airflow/contrib/hooks/gcs_hook.py</span>
     <span class="k">def</span> <span class="nf">_gcs_object_is_directory</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="nb">object</span><span class="p">):</span>
         <span class="n">bucket</span><span class="p">,</span> <span class="n">blob</span> <span class="o">=</span> <span class="n">_parse_gcs_url</span><span class="p">(</span><span class="nb">object</span><span class="p">)</span>

         <span class="k">return</span> <span class="nb">len</span><span class="p">(</span><span class="n">blob</span><span class="p">)</span> <span class="o">==</span> <span class="mi">0</span> <span class="ow">or</span> <span class="n">blob</span><span class="o">.</span><span class="n">endswith</span><span class="p">(</span><span class="s1">&#39;/&#39;</span><span class="p">)</span></div>
 </pre></div>

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