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<h1>Source code for airflow.contrib.hooks.wasb_hook</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="c1">#</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.base_hook</span> <span class="k">import</span> <span class="n">BaseHook</span>
<span class="kn">from</span> <span class="nn">azure.storage.blob</span> <span class="k">import</span> <span class="n">BlockBlobService</span>
<div class="viewcode-block" id="WasbHook"><a class="viewcode-back" href="../../../../_api/airflow/contrib/hooks/wasb_hook/index.html#airflow.contrib.hooks.wasb_hook.WasbHook">[docs]</a><span class="k">class</span> <span class="nc">WasbHook</span><span class="p">(</span><span class="n">BaseHook</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Interacts with Azure Blob Storage through the wasb:// protocol.</span>
<span class="sd"> Additional options passed in the &#39;extra&#39; field of the connection will be</span>
<span class="sd"> passed to the `BlockBlockService()` constructor. For example, authenticate</span>
<span class="sd"> using a SAS token by adding {&quot;sas_token&quot;: &quot;YOUR_TOKEN&quot;}.</span>
<span class="sd"> :param wasb_conn_id: Reference to the wasb connection.</span>
<span class="sd"> :type wasb_conn_id: str</span>
<span class="sd"> &quot;&quot;&quot;</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">wasb_conn_id</span><span class="o">=</span><span class="s1">&#39;wasb_default&#39;</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">conn_id</span> <span class="o">=</span> <span class="n">wasb_conn_id</span>
<span class="bp">self</span><span class="o">.</span><span class="n">connection</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_conn</span><span class="p">()</span>
<div class="viewcode-block" id="WasbHook.get_conn"><a class="viewcode-back" href="../../../../_api/airflow/contrib/hooks/wasb_hook/index.html#airflow.contrib.hooks.wasb_hook.WasbHook.get_conn">[docs]</a> <span class="k">def</span> <span class="nf">get_conn</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;Return the BlockBlobService object.&quot;&quot;&quot;</span>
<span class="n">conn</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_connection</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">conn_id</span><span class="p">)</span>
<span class="n">service_options</span> <span class="o">=</span> <span class="n">conn</span><span class="o">.</span><span class="n">extra_dejson</span>
<span class="k">return</span> <span class="n">BlockBlobService</span><span class="p">(</span><span class="n">account_name</span><span class="o">=</span><span class="n">conn</span><span class="o">.</span><span class="n">login</span><span class="p">,</span>
<span class="n">account_key</span><span class="o">=</span><span class="n">conn</span><span class="o">.</span><span class="n">password</span><span class="p">,</span> <span class="o">**</span><span class="n">service_options</span><span class="p">)</span></div>
<div class="viewcode-block" id="WasbHook.check_for_blob"><a class="viewcode-back" href="../../../../_api/airflow/contrib/hooks/wasb_hook/index.html#airflow.contrib.hooks.wasb_hook.WasbHook.check_for_blob">[docs]</a> <span class="k">def</span> <span class="nf">check_for_blob</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">container_name</span><span class="p">,</span> <span class="n">blob_name</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Check if a blob exists on Azure Blob Storage.</span>
<span class="sd"> :param container_name: Name of the container.</span>
<span class="sd"> :type container_name: str</span>
<span class="sd"> :param blob_name: Name of the blob.</span>
<span class="sd"> :type blob_name: str</span>
<span class="sd"> :param kwargs: Optional keyword arguments that</span>
<span class="sd"> `BlockBlobService.exists()` takes.</span>
<span class="sd"> :type kwargs: object</span>
<span class="sd"> :return: True if the blob exists, False otherwise.</span>
<span class="sd"> :rtype: bool</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">connection</span><span class="o">.</span><span class="n">exists</span><span class="p">(</span><span class="n">container_name</span><span class="p">,</span> <span class="n">blob_name</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span></div>
<div class="viewcode-block" id="WasbHook.check_for_prefix"><a class="viewcode-back" href="../../../../_api/airflow/contrib/hooks/wasb_hook/index.html#airflow.contrib.hooks.wasb_hook.WasbHook.check_for_prefix">[docs]</a> <span class="k">def</span> <span class="nf">check_for_prefix</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">container_name</span><span class="p">,</span> <span class="n">prefix</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Check if a prefix exists on Azure Blob storage.</span>
<span class="sd"> :param container_name: Name of the container.</span>
<span class="sd"> :type container_name: str</span>
<span class="sd"> :param prefix: Prefix of the blob.</span>
<span class="sd"> :type prefix: str</span>
<span class="sd"> :param kwargs: Optional keyword arguments that</span>
<span class="sd"> `BlockBlobService.list_blobs()` takes.</span>
<span class="sd"> :type kwargs: object</span>
<span class="sd"> :return: True if blobs matching the prefix exist, False otherwise.</span>
<span class="sd"> :rtype: bool</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="n">matches</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">connection</span><span class="o">.</span><span class="n">list_blobs</span><span class="p">(</span><span class="n">container_name</span><span class="p">,</span> <span class="n">prefix</span><span class="p">,</span>
<span class="n">num_results</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
<span class="k">return</span> <span class="nb">len</span><span class="p">(</span><span class="nb">list</span><span class="p">(</span><span class="n">matches</span><span class="p">))</span> <span class="o">&gt;</span> <span class="mi">0</span></div>
<div class="viewcode-block" id="WasbHook.load_file"><a class="viewcode-back" href="../../../../_api/airflow/contrib/hooks/wasb_hook/index.html#airflow.contrib.hooks.wasb_hook.WasbHook.load_file">[docs]</a> <span class="k">def</span> <span class="nf">load_file</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">file_path</span><span class="p">,</span> <span class="n">container_name</span><span class="p">,</span> <span class="n">blob_name</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Upload a file to Azure Blob Storage.</span>
<span class="sd"> :param file_path: Path to the file to load.</span>
<span class="sd"> :type file_path: str</span>
<span class="sd"> :param container_name: Name of the container.</span>
<span class="sd"> :type container_name: str</span>
<span class="sd"> :param blob_name: Name of the blob.</span>
<span class="sd"> :type blob_name: str</span>
<span class="sd"> :param kwargs: Optional keyword arguments that</span>
<span class="sd"> `BlockBlobService.create_blob_from_path()` takes.</span>
<span class="sd"> :type kwargs: object</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="c1"># Reorder the argument order from airflow.hooks.S3_hook.load_file.</span>
<span class="bp">self</span><span class="o">.</span><span class="n">connection</span><span class="o">.</span><span class="n">create_blob_from_path</span><span class="p">(</span><span class="n">container_name</span><span class="p">,</span> <span class="n">blob_name</span><span class="p">,</span>
<span class="n">file_path</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span></div>
<div class="viewcode-block" id="WasbHook.load_string"><a class="viewcode-back" href="../../../../_api/airflow/contrib/hooks/wasb_hook/index.html#airflow.contrib.hooks.wasb_hook.WasbHook.load_string">[docs]</a> <span class="k">def</span> <span class="nf">load_string</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">string_data</span><span class="p">,</span> <span class="n">container_name</span><span class="p">,</span> <span class="n">blob_name</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Upload a string to Azure Blob Storage.</span>
<span class="sd"> :param string_data: String to load.</span>
<span class="sd"> :type string_data: str</span>
<span class="sd"> :param container_name: Name of the container.</span>
<span class="sd"> :type container_name: str</span>
<span class="sd"> :param blob_name: Name of the blob.</span>
<span class="sd"> :type blob_name: str</span>
<span class="sd"> :param kwargs: Optional keyword arguments that</span>
<span class="sd"> `BlockBlobService.create_blob_from_text()` takes.</span>
<span class="sd"> :type kwargs: object</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="c1"># Reorder the argument order from airflow.hooks.S3_hook.load_string.</span>
<span class="bp">self</span><span class="o">.</span><span class="n">connection</span><span class="o">.</span><span class="n">create_blob_from_text</span><span class="p">(</span><span class="n">container_name</span><span class="p">,</span> <span class="n">blob_name</span><span class="p">,</span>
<span class="n">string_data</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span></div>
<div class="viewcode-block" id="WasbHook.get_file"><a class="viewcode-back" href="../../../../_api/airflow/contrib/hooks/wasb_hook/index.html#airflow.contrib.hooks.wasb_hook.WasbHook.get_file">[docs]</a> <span class="k">def</span> <span class="nf">get_file</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">file_path</span><span class="p">,</span> <span class="n">container_name</span><span class="p">,</span> <span class="n">blob_name</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Download a file from Azure Blob Storage.</span>
<span class="sd"> :param file_path: Path to the file to download.</span>
<span class="sd"> :type file_path: str</span>
<span class="sd"> :param container_name: Name of the container.</span>
<span class="sd"> :type container_name: str</span>
<span class="sd"> :param blob_name: Name of the blob.</span>
<span class="sd"> :type blob_name: str</span>
<span class="sd"> :param kwargs: Optional keyword arguments that</span>
<span class="sd"> `BlockBlobService.create_blob_from_path()` takes.</span>
<span class="sd"> :type kwargs: object</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">connection</span><span class="o">.</span><span class="n">get_blob_to_path</span><span class="p">(</span><span class="n">container_name</span><span class="p">,</span> <span class="n">blob_name</span><span class="p">,</span>
<span class="n">file_path</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span></div>
<div class="viewcode-block" id="WasbHook.read_file"><a class="viewcode-back" href="../../../../_api/airflow/contrib/hooks/wasb_hook/index.html#airflow.contrib.hooks.wasb_hook.WasbHook.read_file">[docs]</a> <span class="k">def</span> <span class="nf">read_file</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">container_name</span><span class="p">,</span> <span class="n">blob_name</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Read a file from Azure Blob Storage and return as a string.</span>
<span class="sd"> :param container_name: Name of the container.</span>
<span class="sd"> :type container_name: str</span>
<span class="sd"> :param blob_name: Name of the blob.</span>
<span class="sd"> :type blob_name: str</span>
<span class="sd"> :param kwargs: Optional keyword arguments that</span>
<span class="sd"> `BlockBlobService.create_blob_from_path()` takes.</span>
<span class="sd"> :type kwargs: object</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">connection</span><span class="o">.</span><span class="n">get_blob_to_text</span><span class="p">(</span><span class="n">container_name</span><span class="p">,</span>
<span class="n">blob_name</span><span class="p">,</span>
<span class="o">**</span><span class="n">kwargs</span><span class="p">)</span><span class="o">.</span><span class="n">content</span></div>
<div class="viewcode-block" id="WasbHook.delete_file"><a class="viewcode-back" href="../../../../_api/airflow/contrib/hooks/wasb_hook/index.html#airflow.contrib.hooks.wasb_hook.WasbHook.delete_file">[docs]</a> <span class="k">def</span> <span class="nf">delete_file</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">container_name</span><span class="p">,</span> <span class="n">blob_name</span><span class="p">,</span> <span class="n">is_prefix</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span>
<span class="n">ignore_if_missing</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Delete a file from Azure Blob Storage.</span>
<span class="sd"> :param container_name: Name of the container.</span>
<span class="sd"> :type container_name: str</span>
<span class="sd"> :param blob_name: Name of the blob.</span>
<span class="sd"> :type blob_name: str</span>
<span class="sd"> :param is_prefix: If blob_name is a prefix, delete all matching files</span>
<span class="sd"> :type is_prefix: bool</span>
<span class="sd"> :param ignore_if_missing: if True, then return success even if the</span>
<span class="sd"> blob does not exist.</span>
<span class="sd"> :type ignore_if_missing: bool</span>
<span class="sd"> :param kwargs: Optional keyword arguments that</span>
<span class="sd"> `BlockBlobService.create_blob_from_path()` takes.</span>
<span class="sd"> :type kwargs: object</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="k">if</span> <span class="n">is_prefix</span><span class="p">:</span>
<span class="n">blobs_to_delete</span> <span class="o">=</span> <span class="p">[</span>
<span class="n">blob</span><span class="o">.</span><span class="n">name</span> <span class="k">for</span> <span class="n">blob</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">connection</span><span class="o">.</span><span class="n">list_blobs</span><span class="p">(</span>
<span class="n">container_name</span><span class="p">,</span> <span class="n">prefix</span><span class="o">=</span><span class="n">blob_name</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span>
<span class="p">)</span>
<span class="p">]</span>
<span class="k">elif</span> <span class="bp">self</span><span class="o">.</span><span class="n">check_for_blob</span><span class="p">(</span><span class="n">container_name</span><span class="p">,</span> <span class="n">blob_name</span><span class="p">):</span>
<span class="n">blobs_to_delete</span> <span class="o">=</span> <span class="p">[</span><span class="n">blob_name</span><span class="p">]</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">blobs_to_delete</span> <span class="o">=</span> <span class="p">[]</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">ignore_if_missing</span> <span class="ow">and</span> <span class="nb">len</span><span class="p">(</span><span class="n">blobs_to_delete</span><span class="p">)</span> <span class="o">==</span> <span class="mi">0</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">AirflowException</span><span class="p">(</span><span class="s1">&#39;Blob(s) not found: </span><span class="si">{}</span><span class="s1">&#39;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">blob_name</span><span class="p">))</span>
<span class="k">for</span> <span class="n">blob_uri</span> <span class="ow">in</span> <span class="n">blobs_to_delete</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;Deleting blob: &quot;</span> <span class="o">+</span> <span class="n">blob_uri</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">connection</span><span class="o">.</span><span class="n">delete_blob</span><span class="p">(</span><span class="n">container_name</span><span class="p">,</span>
<span class="n">blob_uri</span><span class="p">,</span>
<span class="n">delete_snapshots</span><span class="o">=</span><span class="s1">&#39;include&#39;</span><span class="p">,</span>
<span class="o">**</span><span class="n">kwargs</span><span class="p">)</span></div></div>
</pre></div>
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