Google Git
Sign in
apache / beam-site / refs/heads/updates_release_2.15.0 / . / pydoc / 2.15.0 / _modules / apache_beam / io / gcp / datastore / v1new / datastore_write_it_pipeline.html
blob: 95594689c9f6a3a74b215e5b38cffa4cfd0ccc75 [file] [log] [blame]
<!DOCTYPE html>
<!--[if IE 8]><html class="no-js lt-ie9" lang="en" > <![endif]-->
<!--[if gt IE 8]><!--> <html class="no-js" lang="en" > <!--<![endif]-->
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>apache_beam.io.gcp.datastore.v1new.datastore_write_it_pipeline &mdash; Apache Beam documentation</title>
<link rel="stylesheet" href="../../../../../../_static/css/theme.css" type="text/css" />
<link rel="index" title="Index"
href="../../../../../../genindex.html"/>
<link rel="search" title="Search" href="../../../../../../search.html"/>
<link rel="top" title="Apache Beam documentation" href="../../../../../../index.html"/>
<link rel="up" title="Module code" href="../../../../../index.html"/>
<script src="../../../../../../_static/js/modernizr.min.js"></script>
</head>
<body class="wy-body-for-nav" role="document">
<div class="wy-grid-for-nav">
<nav data-toggle="wy-nav-shift" class="wy-nav-side">
<div class="wy-side-scroll">
<div class="wy-side-nav-search">
<a href="../../../../../../index.html" class="icon icon-home"> Apache Beam
</a>
<div role="search">
<form id="rtd-search-form" class="wy-form" action="../../../../../../search.html" method="get">
<input type="text" name="q" placeholder="Search docs" />
<input type="hidden" name="check_keywords" value="yes" />
<input type="hidden" name="area" value="default" />
</form>
</div>
</div>
<div class="wy-menu wy-menu-vertical" data-spy="affix" role="navigation" aria-label="main navigation">
<ul>
<li class="toctree-l1"><a class="reference internal" href="../../../../../../apache_beam.coders.html">apache_beam.coders package</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../../../../../apache_beam.internal.html">apache_beam.internal package</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../../../../../apache_beam.io.html">apache_beam.io package</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../../../../../apache_beam.metrics.html">apache_beam.metrics package</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../../../../../apache_beam.options.html">apache_beam.options package</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../../../../../apache_beam.portability.html">apache_beam.portability package</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../../../../../apache_beam.runners.html">apache_beam.runners package</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../../../../../apache_beam.testing.html">apache_beam.testing package</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../../../../../apache_beam.tools.html">apache_beam.tools package</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../../../../../apache_beam.transforms.html">apache_beam.transforms package</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../../../../../apache_beam.typehints.html">apache_beam.typehints package</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../../../../../apache_beam.utils.html">apache_beam.utils package</a></li>
</ul>
<ul>
<li class="toctree-l1"><a class="reference internal" href="../../../../../../apache_beam.error.html">apache_beam.error module</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../../../../../apache_beam.pipeline.html">apache_beam.pipeline module</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../../../../../apache_beam.pvalue.html">apache_beam.pvalue module</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../../../../../apache_beam.version.html">apache_beam.version module</a></li>
</ul>
</div>
</div>
</nav>
<section data-toggle="wy-nav-shift" class="wy-nav-content-wrap">
<nav class="wy-nav-top" role="navigation" aria-label="top navigation">
<i data-toggle="wy-nav-top" class="fa fa-bars"></i>
<a href="../../../../../../index.html">Apache Beam</a>
</nav>
<div class="wy-nav-content">
<div class="rst-content">
<div role="navigation" aria-label="breadcrumbs navigation">
<ul class="wy-breadcrumbs">
<li><a href="../../../../../../index.html">Docs</a> &raquo;</li>
<li><a href="../../../../../index.html">Module code</a> &raquo;</li>
<li>apache_beam.io.gcp.datastore.v1new.datastore_write_it_pipeline</li>
<li class="wy-breadcrumbs-aside">
</li>
</ul>
<hr/>
</div>
<div role="main" class="document" itemscope="itemscope" itemtype="http://schema.org/Article">
<div itemprop="articleBody">
<h1>Source code for apache_beam.io.gcp.datastore.v1new.datastore_write_it_pipeline</h1><div class="highlight"><pre>
<span></span><span class="c1">#</span>
<span class="c1"># Licensed to the Apache Software Foundation (ASF) under one or more</span>
<span class="c1"># contributor license agreements. See the NOTICE file distributed with</span>
<span class="c1"># this work for additional information regarding copyright ownership.</span>
<span class="c1"># The ASF licenses this file to You under the Apache License, Version 2.0</span>
<span class="c1"># (the &quot;License&quot;); you may not use this file except in compliance with</span>
<span class="c1"># 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, software</span>
<span class="c1"># distributed under the License is distributed on an &quot;AS IS&quot; BASIS,</span>
<span class="c1"># WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span>
<span class="c1"># See the License for the specific language governing permissions and</span>
<span class="c1"># limitations under the License.</span>
<span class="c1">#</span>
<span class="sd">&quot;&quot;&quot;A job that write Entries into Datastore.</span>
<span class="sd">The pipelines behave in the steps below.</span>
<span class="sd"> 1. Create and write Entities to Datastore</span>
<span class="sd"> 2. (Optional) If read limit was provided,</span>
<span class="sd"> read it and confirm that the expected Entities were read.</span>
<span class="sd"> 3. Query the written Entities and verify result.</span>
<span class="sd"> 4. Delete Entries.</span>
<span class="sd"> 5. Query the written Entities, verify no results.</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="kn">from</span> <span class="nn">__future__</span> <span class="k">import</span> <span class="n">absolute_import</span>
<span class="kn">import</span> <span class="nn">argparse</span>
<span class="kn">import</span> <span class="nn">hashlib</span>
<span class="kn">import</span> <span class="nn">logging</span>
<span class="kn">import</span> <span class="nn">uuid</span>
<span class="kn">import</span> <span class="nn">apache_beam</span> <span class="k">as</span> <span class="nn">beam</span>
<span class="kn">from</span> <span class="nn">apache_beam.io.gcp.datastore.v1new.datastoreio</span> <span class="k">import</span> <span class="n">DeleteFromDatastore</span>
<span class="kn">from</span> <span class="nn">apache_beam.io.gcp.datastore.v1new.datastoreio</span> <span class="k">import</span> <span class="n">ReadFromDatastore</span>
<span class="kn">from</span> <span class="nn">apache_beam.io.gcp.datastore.v1new.datastoreio</span> <span class="k">import</span> <span class="n">WriteToDatastore</span>
<span class="kn">from</span> <span class="nn">apache_beam.io.gcp.datastore.v1new.types</span> <span class="k">import</span> <span class="n">Entity</span>
<span class="kn">from</span> <span class="nn">apache_beam.io.gcp.datastore.v1new.types</span> <span class="k">import</span> <span class="n">Key</span>
<span class="kn">from</span> <span class="nn">apache_beam.io.gcp.datastore.v1new.types</span> <span class="k">import</span> <span class="n">Query</span>
<span class="kn">from</span> <span class="nn">apache_beam.options.pipeline_options</span> <span class="k">import</span> <span class="n">GoogleCloudOptions</span>
<span class="kn">from</span> <span class="nn">apache_beam.options.pipeline_options</span> <span class="k">import</span> <span class="n">PipelineOptions</span>
<span class="kn">from</span> <span class="nn">apache_beam.options.pipeline_options</span> <span class="k">import</span> <span class="n">SetupOptions</span>
<span class="kn">from</span> <span class="nn">apache_beam.testing.test_pipeline</span> <span class="k">import</span> <span class="n">TestPipeline</span>
<span class="kn">from</span> <span class="nn">apache_beam.testing.util</span> <span class="k">import</span> <span class="n">assert_that</span>
<span class="kn">from</span> <span class="nn">apache_beam.testing.util</span> <span class="k">import</span> <span class="n">equal_to</span>
<div class="viewcode-block" id="new_pipeline_with_job_name"><a class="viewcode-back" href="../../../../../../apache_beam.io.gcp.datastore.v1new.datastore_write_it_pipeline.html#apache_beam.io.gcp.datastore.v1new.datastore_write_it_pipeline.new_pipeline_with_job_name">[docs]</a><span class="k">def</span> <span class="nf">new_pipeline_with_job_name</span><span class="p">(</span><span class="n">pipeline_options</span><span class="p">,</span> <span class="n">job_name</span><span class="p">,</span> <span class="n">suffix</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;Create a pipeline with the given job_name and a suffix.&quot;&quot;&quot;</span>
<span class="n">gcp_options</span> <span class="o">=</span> <span class="n">pipeline_options</span><span class="o">.</span><span class="n">view_as</span><span class="p">(</span><span class="n">GoogleCloudOptions</span><span class="p">)</span>
<span class="c1"># DirectRunner doesn&#39;t have a job name.</span>
<span class="k">if</span> <span class="n">job_name</span><span class="p">:</span>
<span class="n">gcp_options</span><span class="o">.</span><span class="n">job_name</span> <span class="o">=</span> <span class="n">job_name</span> <span class="o">+</span> <span class="n">suffix</span>
<span class="k">return</span> <span class="n">TestPipeline</span><span class="p">(</span><span class="n">options</span><span class="o">=</span><span class="n">pipeline_options</span><span class="p">)</span></div>
<div class="viewcode-block" id="EntityWrapper"><a class="viewcode-back" href="../../../../../../apache_beam.io.gcp.datastore.v1new.datastore_write_it_pipeline.html#apache_beam.io.gcp.datastore.v1new.datastore_write_it_pipeline.EntityWrapper">[docs]</a><span class="k">class</span> <span class="nc">EntityWrapper</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Create a Cloud Datastore entity from the given string.</span>
<span class="sd"> Namespace and project are taken from the parent key.</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">kind</span><span class="p">,</span> <span class="n">parent_key</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_kind</span> <span class="o">=</span> <span class="n">kind</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_parent_key</span> <span class="o">=</span> <span class="n">parent_key</span>
<div class="viewcode-block" id="EntityWrapper.make_entity"><a class="viewcode-back" href="../../../../../../apache_beam.io.gcp.datastore.v1new.datastore_write_it_pipeline.html#apache_beam.io.gcp.datastore.v1new.datastore_write_it_pipeline.EntityWrapper.make_entity">[docs]</a> <span class="k">def</span> <span class="nf">make_entity</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">content</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;Create entity from given string.&quot;&quot;&quot;</span>
<span class="n">key</span> <span class="o">=</span> <span class="n">Key</span><span class="p">([</span><span class="bp">self</span><span class="o">.</span><span class="n">_kind</span><span class="p">,</span> <span class="n">hashlib</span><span class="o">.</span><span class="n">sha1</span><span class="p">(</span><span class="n">content</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="o">.</span><span class="n">hexdigest</span><span class="p">()],</span>
<span class="n">parent</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">_parent_key</span><span class="p">)</span>
<span class="n">entity</span> <span class="o">=</span> <span class="n">Entity</span><span class="p">(</span><span class="n">key</span><span class="p">)</span>
<span class="n">entity</span><span class="o">.</span><span class="n">set_properties</span><span class="p">({</span><span class="s1">&#39;content&#39;</span><span class="p">:</span> <span class="nb">str</span><span class="p">(</span><span class="n">content</span><span class="p">)})</span>
<span class="k">return</span> <span class="n">entity</span></div></div>
<div class="viewcode-block" id="run"><a class="viewcode-back" href="../../../../../../apache_beam.io.gcp.datastore.v1new.datastore_write_it_pipeline.html#apache_beam.io.gcp.datastore.v1new.datastore_write_it_pipeline.run">[docs]</a><span class="k">def</span> <span class="nf">run</span><span class="p">(</span><span class="n">argv</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;Main entry point.&quot;&quot;&quot;</span>
<span class="n">parser</span> <span class="o">=</span> <span class="n">argparse</span><span class="o">.</span><span class="n">ArgumentParser</span><span class="p">()</span>
<span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s1">&#39;--kind&#39;</span><span class="p">,</span>
<span class="n">dest</span><span class="o">=</span><span class="s1">&#39;kind&#39;</span><span class="p">,</span>
<span class="n">default</span><span class="o">=</span><span class="s1">&#39;writereadtest&#39;</span><span class="p">,</span>
<span class="n">help</span><span class="o">=</span><span class="s1">&#39;Datastore Kind&#39;</span><span class="p">)</span>
<span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s1">&#39;--num_entities&#39;</span><span class="p">,</span>
<span class="n">dest</span><span class="o">=</span><span class="s1">&#39;num_entities&#39;</span><span class="p">,</span>
<span class="nb">type</span><span class="o">=</span><span class="nb">int</span><span class="p">,</span>
<span class="n">required</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span>
<span class="n">help</span><span class="o">=</span><span class="s1">&#39;Number of entities to write&#39;</span><span class="p">)</span>
<span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s1">&#39;--limit&#39;</span><span class="p">,</span>
<span class="n">dest</span><span class="o">=</span><span class="s1">&#39;limit&#39;</span><span class="p">,</span>
<span class="nb">type</span><span class="o">=</span><span class="nb">int</span><span class="p">,</span>
<span class="n">help</span><span class="o">=</span><span class="s1">&#39;Limit of number of entities to write&#39;</span><span class="p">)</span>
<span class="n">known_args</span><span class="p">,</span> <span class="n">pipeline_args</span> <span class="o">=</span> <span class="n">parser</span><span class="o">.</span><span class="n">parse_known_args</span><span class="p">(</span><span class="n">argv</span><span class="p">)</span>
<span class="n">pipeline_options</span> <span class="o">=</span> <span class="n">PipelineOptions</span><span class="p">(</span><span class="n">pipeline_args</span><span class="p">)</span>
<span class="n">pipeline_options</span><span class="o">.</span><span class="n">view_as</span><span class="p">(</span><span class="n">SetupOptions</span><span class="p">)</span><span class="o">.</span><span class="n">save_main_session</span> <span class="o">=</span> <span class="kc">True</span>
<span class="n">gcloud_options</span> <span class="o">=</span> <span class="n">pipeline_options</span><span class="o">.</span><span class="n">view_as</span><span class="p">(</span><span class="n">GoogleCloudOptions</span><span class="p">)</span>
<span class="n">job_name</span> <span class="o">=</span> <span class="n">gcloud_options</span><span class="o">.</span><span class="n">job_name</span>
<span class="n">kind</span> <span class="o">=</span> <span class="n">known_args</span><span class="o">.</span><span class="n">kind</span>
<span class="n">num_entities</span> <span class="o">=</span> <span class="n">known_args</span><span class="o">.</span><span class="n">num_entities</span>
<span class="n">project</span> <span class="o">=</span> <span class="n">gcloud_options</span><span class="o">.</span><span class="n">project</span>
<span class="c1"># Pipeline 1: Create and write the specified number of Entities to the</span>
<span class="c1"># Cloud Datastore.</span>
<span class="n">ancestor_key</span> <span class="o">=</span> <span class="n">Key</span><span class="p">([</span><span class="n">kind</span><span class="p">,</span> <span class="nb">str</span><span class="p">(</span><span class="n">uuid</span><span class="o">.</span><span class="n">uuid4</span><span class="p">())],</span> <span class="n">project</span><span class="o">=</span><span class="n">project</span><span class="p">)</span>
<span class="n">logging</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s1">&#39;Writing </span><span class="si">%s</span><span class="s1"> entities to </span><span class="si">%s</span><span class="s1">&#39;</span><span class="p">,</span> <span class="n">num_entities</span><span class="p">,</span> <span class="n">project</span><span class="p">)</span>
<span class="n">p</span> <span class="o">=</span> <span class="n">new_pipeline_with_job_name</span><span class="p">(</span><span class="n">pipeline_options</span><span class="p">,</span> <span class="n">job_name</span><span class="p">,</span> <span class="s1">&#39;-write&#39;</span><span class="p">)</span>
<span class="n">_</span> <span class="o">=</span> <span class="p">(</span><span class="n">p</span>
<span class="o">|</span> <span class="s1">&#39;Input&#39;</span> <span class="o">&gt;&gt;</span> <span class="n">beam</span><span class="o">.</span><span class="n">Create</span><span class="p">(</span><span class="nb">list</span><span class="p">(</span><span class="nb">range</span><span class="p">(</span><span class="n">num_entities</span><span class="p">)))</span>
<span class="o">|</span> <span class="s1">&#39;To String&#39;</span> <span class="o">&gt;&gt;</span> <span class="n">beam</span><span class="o">.</span><span class="n">Map</span><span class="p">(</span><span class="nb">str</span><span class="p">)</span>
<span class="o">|</span> <span class="s1">&#39;To Entity&#39;</span> <span class="o">&gt;&gt;</span> <span class="n">beam</span><span class="o">.</span><span class="n">Map</span><span class="p">(</span><span class="n">EntityWrapper</span><span class="p">(</span><span class="n">kind</span><span class="p">,</span> <span class="n">ancestor_key</span><span class="p">)</span><span class="o">.</span><span class="n">make_entity</span><span class="p">)</span>
<span class="o">|</span> <span class="s1">&#39;Write to Datastore&#39;</span> <span class="o">&gt;&gt;</span> <span class="n">WriteToDatastore</span><span class="p">(</span><span class="n">project</span><span class="p">))</span>
<span class="n">p</span><span class="o">.</span><span class="n">run</span><span class="p">()</span>
<span class="n">query</span> <span class="o">=</span> <span class="n">Query</span><span class="p">(</span><span class="n">kind</span><span class="o">=</span><span class="n">kind</span><span class="p">,</span> <span class="n">project</span><span class="o">=</span><span class="n">project</span><span class="p">,</span> <span class="n">ancestor</span><span class="o">=</span><span class="n">ancestor_key</span><span class="p">)</span>
<span class="c1"># Optional Pipeline 2: If a read limit was provided, read it and confirm</span>
<span class="c1"># that the expected entities were read.</span>
<span class="k">if</span> <span class="n">known_args</span><span class="o">.</span><span class="n">limit</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
<span class="n">logging</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s1">&#39;Querying a limited set of </span><span class="si">%s</span><span class="s1"> entities and verifying count.&#39;</span><span class="p">,</span>
<span class="n">known_args</span><span class="o">.</span><span class="n">limit</span><span class="p">)</span>
<span class="n">p</span> <span class="o">=</span> <span class="n">new_pipeline_with_job_name</span><span class="p">(</span><span class="n">pipeline_options</span><span class="p">,</span> <span class="n">job_name</span><span class="p">,</span> <span class="s1">&#39;-verify-limit&#39;</span><span class="p">)</span>
<span class="n">query</span><span class="o">.</span><span class="n">limit</span> <span class="o">=</span> <span class="n">known_args</span><span class="o">.</span><span class="n">limit</span>
<span class="n">entities</span> <span class="o">=</span> <span class="n">p</span> <span class="o">|</span> <span class="s1">&#39;read from datastore&#39;</span> <span class="o">&gt;&gt;</span> <span class="n">ReadFromDatastore</span><span class="p">(</span><span class="n">query</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">(</span>
<span class="n">entities</span> <span class="o">|</span> <span class="n">beam</span><span class="o">.</span><span class="n">combiners</span><span class="o">.</span><span class="n">Count</span><span class="o">.</span><span class="n">Globally</span><span class="p">(),</span>
<span class="n">equal_to</span><span class="p">([</span><span class="n">known_args</span><span class="o">.</span><span class="n">limit</span><span class="p">]))</span>
<span class="n">p</span><span class="o">.</span><span class="n">run</span><span class="p">()</span>
<span class="n">query</span><span class="o">.</span><span class="n">limit</span> <span class="o">=</span> <span class="kc">None</span>
<span class="c1"># Pipeline 3: Query the written Entities and verify result.</span>
<span class="n">logging</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s1">&#39;Querying entities, asserting they match.&#39;</span><span class="p">)</span>
<span class="n">p</span> <span class="o">=</span> <span class="n">new_pipeline_with_job_name</span><span class="p">(</span><span class="n">pipeline_options</span><span class="p">,</span> <span class="n">job_name</span><span class="p">,</span> <span class="s1">&#39;-verify&#39;</span><span class="p">)</span>
<span class="n">entities</span> <span class="o">=</span> <span class="n">p</span> <span class="o">|</span> <span class="s1">&#39;read from datastore&#39;</span> <span class="o">&gt;&gt;</span> <span class="n">ReadFromDatastore</span><span class="p">(</span><span class="n">query</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">(</span>
<span class="n">entities</span> <span class="o">|</span> <span class="n">beam</span><span class="o">.</span><span class="n">combiners</span><span class="o">.</span><span class="n">Count</span><span class="o">.</span><span class="n">Globally</span><span class="p">(),</span>
<span class="n">equal_to</span><span class="p">([</span><span class="n">num_entities</span><span class="p">]))</span>
<span class="n">p</span><span class="o">.</span><span class="n">run</span><span class="p">()</span>
<span class="c1"># Pipeline 4: Delete Entities.</span>
<span class="n">logging</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s1">&#39;Deleting entities.&#39;</span><span class="p">)</span>
<span class="n">p</span> <span class="o">=</span> <span class="n">new_pipeline_with_job_name</span><span class="p">(</span><span class="n">pipeline_options</span><span class="p">,</span> <span class="n">job_name</span><span class="p">,</span> <span class="s1">&#39;-delete&#39;</span><span class="p">)</span>
<span class="n">entities</span> <span class="o">=</span> <span class="n">p</span> <span class="o">|</span> <span class="s1">&#39;read from datastore&#39;</span> <span class="o">&gt;&gt;</span> <span class="n">ReadFromDatastore</span><span class="p">(</span><span class="n">query</span><span class="p">)</span>
<span class="n">_</span> <span class="o">=</span> <span class="p">(</span><span class="n">entities</span>
<span class="o">|</span> <span class="s1">&#39;To Keys&#39;</span> <span class="o">&gt;&gt;</span> <span class="n">beam</span><span class="o">.</span><span class="n">Map</span><span class="p">(</span><span class="k">lambda</span> <span class="n">entity</span><span class="p">:</span> <span class="n">entity</span><span class="o">.</span><span class="n">key</span><span class="p">)</span>
<span class="o">|</span> <span class="s1">&#39;delete entities&#39;</span> <span class="o">&gt;&gt;</span> <span class="n">DeleteFromDatastore</span><span class="p">(</span><span class="n">project</span><span class="p">))</span>
<span class="n">p</span><span class="o">.</span><span class="n">run</span><span class="p">()</span>
<span class="c1"># Pipeline 5: Query the written Entities, verify no results.</span>
<span class="n">logging</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s1">&#39;Querying for the entities to make sure there are none present.&#39;</span><span class="p">)</span>
<span class="n">p</span> <span class="o">=</span> <span class="n">new_pipeline_with_job_name</span><span class="p">(</span><span class="n">pipeline_options</span><span class="p">,</span> <span class="n">job_name</span><span class="p">,</span> <span class="s1">&#39;-verify-deleted&#39;</span><span class="p">)</span>
<span class="n">entities</span> <span class="o">=</span> <span class="n">p</span> <span class="o">|</span> <span class="s1">&#39;read from datastore&#39;</span> <span class="o">&gt;&gt;</span> <span class="n">ReadFromDatastore</span><span class="p">(</span><span class="n">query</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">(</span>
<span class="n">entities</span> <span class="o">|</span> <span class="n">beam</span><span class="o">.</span><span class="n">combiners</span><span class="o">.</span><span class="n">Count</span><span class="o">.</span><span class="n">Globally</span><span class="p">(),</span>
<span class="n">equal_to</span><span class="p">([</span><span class="mi">0</span><span class="p">]))</span>
<span class="n">p</span><span class="o">.</span><span class="n">run</span><span class="p">()</span></div>
<span class="k">if</span> <span class="vm">__name__</span> <span class="o">==</span> <span class="s1">&#39;__main__&#39;</span><span class="p">:</span>
<span class="n">logging</span><span class="o">.</span><span class="n">getLogger</span><span class="p">()</span><span class="o">.</span><span class="n">setLevel</span><span class="p">(</span><span class="n">logging</span><span class="o">.</span><span class="n">INFO</span><span class="p">)</span>
<span class="n">run</span><span class="p">()</span>
</pre></div>
</div>
<div class="articleComments">
</div>
</div>
<footer>
<hr/>
<div role="contentinfo">
<p>
&copy; Copyright .
</p>
</div>
Built with <a href="http://sphinx-doc.org/">Sphinx</a> using a <a href="https://github.com/snide/sphinx_rtd_theme">theme</a> provided by <a href="https://readthedocs.org">Read the Docs</a>.
</footer>
</div>
</div>
</section>
</div>
<script type="text/javascript">
var DOCUMENTATION_OPTIONS = {
URL_ROOT:'../../../../../../',
VERSION:'',
COLLAPSE_INDEX:false,
FILE_SUFFIX:'.html',
HAS_SOURCE: true,
SOURCELINK_SUFFIX: '.txt'
};
</script>
<script type="text/javascript" src="../../../../../../_static/jquery.js"></script>
<script type="text/javascript" src="../../../../../../_static/underscore.js"></script>
<script type="text/javascript" src="../../../../../../_static/doctools.js"></script>
<script type="text/javascript" src="../../../../../../_static/js/theme.js"></script>
<script type="text/javascript">
jQuery(function () {
SphinxRtdTheme.StickyNav.enable();
});
</script>
</body>
</html>