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<blockquote>
<div></div></blockquote>
<div class="section" id="plugins">
<h1>Plugins<a class="headerlink" href="#plugins" title="Permalink to this headline"></a></h1>
<p>Airflow has a simple plugin manager built-in that can integrate external
features to its core by simply dropping files in your
<code class="docutils literal notranslate"><span class="pre">$AIRFLOW_HOME/plugins</span></code> folder.</p>
<p>The python modules in the <code class="docutils literal notranslate"><span class="pre">plugins</span></code> folder get imported,
and <strong>hooks</strong>, <strong>operators</strong>, <strong>sensors</strong>, <strong>macros</strong>, <strong>executors</strong> and web <strong>views</strong>
get integrated to Airflow’s main collections and become available for use.</p>
<div class="section" id="what-for">
<h2>What for?<a class="headerlink" href="#what-for" title="Permalink to this headline"></a></h2>
<p>Airflow offers a generic toolbox for working with data. Different
organizations have different stacks and different needs. Using Airflow
plugins can be a way for companies to customize their Airflow installation
to reflect their ecosystem.</p>
<p>Plugins can be used as an easy way to write, share and activate new sets of
features.</p>
<p>There’s also a need for a set of more complex applications to interact with
different flavors of data and metadata.</p>
<p>Examples:</p>
<ul class="simple">
<li><p>A set of tools to parse Hive logs and expose Hive metadata (CPU /IO / phases/ skew /…)</p></li>
<li><p>An anomaly detection framework, allowing people to collect metrics, set thresholds and alerts</p></li>
<li><p>An auditing tool, helping understand who accesses what</p></li>
<li><p>A config-driven SLA monitoring tool, allowing you to set monitored tables and at what time
they should land, alert people, and expose visualizations of outages</p></li>
<li><p></p></li>
</ul>
</div>
<div class="section" id="why-build-on-top-of-airflow">
<h2>Why build on top of Airflow?<a class="headerlink" href="#why-build-on-top-of-airflow" title="Permalink to this headline"></a></h2>
<p>Airflow has many components that can be reused when building an application:</p>
<ul class="simple">
<li><p>A web server you can use to render your views</p></li>
<li><p>A metadata database to store your models</p></li>
<li><p>Access to your databases, and knowledge of how to connect to them</p></li>
<li><p>An array of workers that your application can push workload to</p></li>
<li><p>Airflow is deployed, you can just piggy back on its deployment logistics</p></li>
<li><p>Basic charting capabilities, underlying libraries and abstractions</p></li>
</ul>
</div>
<div class="section" id="interface">
<h2>Interface<a class="headerlink" href="#interface" title="Permalink to this headline"></a></h2>
<p>To create a plugin you will need to derive the
<code class="docutils literal notranslate"><span class="pre">airflow.plugins_manager.AirflowPlugin</span></code> class and reference the objects
you want to plug into Airflow. Here’s what the class you need to derive
looks like:</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="k">class</span> <span class="nc">AirflowPlugin</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="c1"># The name of your plugin (str)</span>
<span class="n">name</span> <span class="o">=</span> <span class="bp">None</span>
<span class="c1"># A list of class(es) derived from BaseOperator</span>
<span class="n">operators</span> <span class="o">=</span> <span class="p">[]</span>
<span class="c1"># A list of class(es) derived from BaseSensorOperator</span>
<span class="n">sensors</span> <span class="o">=</span> <span class="p">[]</span>
<span class="c1"># A list of class(es) derived from BaseHook</span>
<span class="n">hooks</span> <span class="o">=</span> <span class="p">[]</span>
<span class="c1"># A list of class(es) derived from BaseExecutor</span>
<span class="n">executors</span> <span class="o">=</span> <span class="p">[]</span>
<span class="c1"># A list of references to inject into the macros namespace</span>
<span class="n">macros</span> <span class="o">=</span> <span class="p">[]</span>
<span class="c1"># A list of objects created from a class derived</span>
<span class="c1"># from flask_admin.BaseView</span>
<span class="n">admin_views</span> <span class="o">=</span> <span class="p">[]</span>
<span class="c1"># A list of Blueprint object created from flask.Blueprint. For use with the flask_admin based GUI</span>
<span class="n">flask_blueprints</span> <span class="o">=</span> <span class="p">[]</span>
<span class="c1"># A list of menu links (flask_admin.base.MenuLink). For use with the flask_admin based GUI</span>
<span class="n">menu_links</span> <span class="o">=</span> <span class="p">[]</span>
<span class="c1"># A list of dictionaries containing FlaskAppBuilder BaseView object and some metadata. See example below</span>
<span class="n">appbuilder_views</span> <span class="o">=</span> <span class="p">[]</span>
<span class="c1"># A list of dictionaries containing FlaskAppBuilder BaseView object and some metadata. See example below</span>
<span class="n">appbuilder_menu_items</span> <span class="o">=</span> <span class="p">[]</span>
<span class="c1"># A list of global operator extra links that can redirect users to</span>
<span class="c1"># external systems. These extra links will be available on the</span>
<span class="c1"># task page in the form of buttons.</span>
<span class="c1">#</span>
<span class="c1"># Note: the global operator extra link can be overridden at each</span>
<span class="c1"># operator level.</span>
<span class="n">global_operator_extra_links</span> <span class="o">=</span> <span class="p">[]</span>
<span class="c1"># A list of operator extra links to override or add operator links</span>
<span class="c1"># to existing Airflow Operators.</span>
<span class="c1"># These extra links will be available on the task page in form of</span>
<span class="c1"># buttons.</span>
<span class="n">operator_extra_links</span> <span class="o">=</span> <span class="p">[]</span>
</pre></div>
</div>
<p>You can derive it by inheritance (please refer to the example below).
Please note <code class="docutils literal notranslate"><span class="pre">name</span></code> inside this class must be specified.</p>
<p>After the plugin is imported into Airflow,
you can invoke it using statement like</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">airflow.</span><span class="p">{</span><span class="nb">type</span><span class="p">,</span> <span class="n">like</span> <span class="s2">&quot;operators&quot;</span><span class="p">,</span> <span class="s2">&quot;sensors&quot;</span><span class="p">}</span><span class="o">.</span><span class="p">{</span><span class="n">name</span> <span class="n">specificed</span> <span class="n">inside</span> <span class="n">the</span> <span class="n">plugin</span> <span class="n">class</span><span class="p">}</span> <span class="kn">import</span> <span class="o">*</span>
</pre></div>
</div>
<p>When you write your own plugins, make sure you understand them well.
There are some essential properties for each type of plugin.
For example,</p>
<ul class="simple">
<li><p>For <code class="docutils literal notranslate"><span class="pre">Operator</span></code> plugin, an <code class="docutils literal notranslate"><span class="pre">execute</span></code> method is compulsory.</p></li>
<li><p>For <code class="docutils literal notranslate"><span class="pre">Sensor</span></code> plugin, a <code class="docutils literal notranslate"><span class="pre">poke</span></code> method returning a Boolean value is compulsory.</p></li>
</ul>
<p>Make sure you restart the webserver and scheduler after making changes to plugins so that they take effect.</p>
</div>
<div class="section" id="example">
<span id="plugin-example"></span><h2>Example<a class="headerlink" href="#example" title="Permalink to this headline"></a></h2>
<p>The code below defines a plugin that injects a set of dummy object
definitions in Airflow.</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="c1"># This is the class you derive to create a plugin</span>
<span class="kn">from</span> <span class="nn">airflow.plugins_manager</span> <span class="kn">import</span> <span class="n">AirflowPlugin</span>
<span class="kn">from</span> <span class="nn">flask</span> <span class="kn">import</span> <span class="n">Blueprint</span>
<span class="kn">from</span> <span class="nn">flask_admin</span> <span class="kn">import</span> <span class="n">BaseView</span><span class="p">,</span> <span class="n">expose</span>
<span class="kn">from</span> <span class="nn">flask_admin.base</span> <span class="kn">import</span> <span class="n">MenuLink</span>
<span class="c1"># Importing base classes that we need to derive</span>
<span class="kn">from</span> <span class="nn">airflow.hooks.base_hook</span> <span class="kn">import</span> <span class="n">BaseHook</span>
<span class="kn">from</span> <span class="nn">airflow.models</span> <span class="kn">import</span> <span class="n">BaseOperator</span>
<span class="kn">from</span> <span class="nn">airflow.models.baseoperator</span> <span class="kn">import</span> <span class="n">BaseOperatorLink</span>
<span class="kn">from</span> <span class="nn">airflow.operators.gcs_to_s3</span> <span class="kn">import</span> <span class="n">GoogleCloudStorageToS3Operator</span>
<span class="kn">from</span> <span class="nn">airflow.sensors.base_sensor_operator</span> <span class="kn">import</span> <span class="n">BaseSensorOperator</span>
<span class="kn">from</span> <span class="nn">airflow.executors.base_executor</span> <span class="kn">import</span> <span class="n">BaseExecutor</span>
<span class="c1"># Will show up under airflow.hooks.test_plugin.PluginHook</span>
<span class="k">class</span> <span class="nc">PluginHook</span><span class="p">(</span><span class="n">BaseHook</span><span class="p">):</span>
<span class="k">pass</span>
<span class="c1"># Will show up under airflow.operators.test_plugin.PluginOperator</span>
<span class="k">class</span> <span class="nc">PluginOperator</span><span class="p">(</span><span class="n">BaseOperator</span><span class="p">):</span>
<span class="k">pass</span>
<span class="c1"># Will show up under airflow.sensors.test_plugin.PluginSensorOperator</span>
<span class="k">class</span> <span class="nc">PluginSensorOperator</span><span class="p">(</span><span class="n">BaseSensorOperator</span><span class="p">):</span>
<span class="k">pass</span>
<span class="c1"># Will show up under airflow.executors.test_plugin.PluginExecutor</span>
<span class="k">class</span> <span class="nc">PluginExecutor</span><span class="p">(</span><span class="n">BaseExecutor</span><span class="p">):</span>
<span class="k">pass</span>
<span class="c1"># Will show up under airflow.macros.test_plugin.plugin_macro</span>
<span class="c1"># and in templates through {{ macros.test_plugin.plugin_macro }}</span>
<span class="k">def</span> <span class="nf">plugin_macro</span><span class="p">():</span>
<span class="k">pass</span>
<span class="c1"># Creating a flask admin BaseView</span>
<span class="k">class</span> <span class="nc">TestView</span><span class="p">(</span><span class="n">BaseView</span><span class="p">):</span>
<span class="nd">@expose</span><span class="p">(</span><span class="s1">&#39;/&#39;</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">test</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="c1"># in this example, put your test_plugin/test.html template at airflow/plugins/templates/test_plugin/test.html</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">render</span><span class="p">(</span><span class="s2">&quot;test_plugin/test.html&quot;</span><span class="p">,</span> <span class="n">content</span><span class="o">=</span><span class="s2">&quot;Hello galaxy!&quot;</span><span class="p">)</span>
<span class="n">v</span> <span class="o">=</span> <span class="n">TestView</span><span class="p">(</span><span class="n">category</span><span class="o">=</span><span class="s2">&quot;Test Plugin&quot;</span><span class="p">,</span> <span class="n">name</span><span class="o">=</span><span class="s2">&quot;Test View&quot;</span><span class="p">)</span>
<span class="c1"># Creating a flask blueprint to integrate the templates and static folder</span>
<span class="n">bp</span> <span class="o">=</span> <span class="n">Blueprint</span><span class="p">(</span>
<span class="s2">&quot;test_plugin&quot;</span><span class="p">,</span> <span class="vm">__name__</span><span class="p">,</span>
<span class="n">template_folder</span><span class="o">=</span><span class="s1">&#39;templates&#39;</span><span class="p">,</span> <span class="c1"># registers airflow/plugins/templates as a Jinja template folder</span>
<span class="n">static_folder</span><span class="o">=</span><span class="s1">&#39;static&#39;</span><span class="p">,</span>
<span class="n">static_url_path</span><span class="o">=</span><span class="s1">&#39;/static/test_plugin&#39;</span><span class="p">)</span>
<span class="n">ml</span> <span class="o">=</span> <span class="n">MenuLink</span><span class="p">(</span>
<span class="n">category</span><span class="o">=</span><span class="s1">&#39;Test Plugin&#39;</span><span class="p">,</span>
<span class="n">name</span><span class="o">=</span><span class="s1">&#39;Test Menu Link&#39;</span><span class="p">,</span>
<span class="n">url</span><span class="o">=</span><span class="s1">&#39;https://airflow.apache.org/&#39;</span><span class="p">)</span>
<span class="c1"># Creating a flask appbuilder BaseView</span>
<span class="k">class</span> <span class="nc">TestAppBuilderBaseView</span><span class="p">(</span><span class="n">AppBuilderBaseView</span><span class="p">):</span>
<span class="nd">@expose</span><span class="p">(</span><span class="s2">&quot;/&quot;</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">test</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">render</span><span class="p">(</span><span class="s2">&quot;test_plugin/test.html&quot;</span><span class="p">,</span> <span class="n">content</span><span class="o">=</span><span class="s2">&quot;Hello galaxy!&quot;</span><span class="p">)</span>
<span class="n">v_appbuilder_view</span> <span class="o">=</span> <span class="n">TestAppBuilderBaseView</span><span class="p">()</span>
<span class="n">v_appbuilder_package</span> <span class="o">=</span> <span class="p">{</span><span class="s2">&quot;name&quot;</span><span class="p">:</span> <span class="s2">&quot;Test View&quot;</span><span class="p">,</span>
<span class="s2">&quot;category&quot;</span><span class="p">:</span> <span class="s2">&quot;Test Plugin&quot;</span><span class="p">,</span>
<span class="s2">&quot;view&quot;</span><span class="p">:</span> <span class="n">v_appbuilder_view</span><span class="p">}</span>
<span class="c1"># Creating a flask appbuilder Menu Item</span>
<span class="n">appbuilder_mitem</span> <span class="o">=</span> <span class="p">{</span><span class="s2">&quot;name&quot;</span><span class="p">:</span> <span class="s2">&quot;Google&quot;</span><span class="p">,</span>
<span class="s2">&quot;category&quot;</span><span class="p">:</span> <span class="s2">&quot;Search&quot;</span><span class="p">,</span>
<span class="s2">&quot;category_icon&quot;</span><span class="p">:</span> <span class="s2">&quot;fa-th&quot;</span><span class="p">,</span>
<span class="s2">&quot;href&quot;</span><span class="p">:</span> <span class="s2">&quot;https://www.google.com&quot;</span><span class="p">}</span>
<span class="c1"># A global operator extra link that redirect you to</span>
<span class="c1"># task logs stored in S3</span>
<span class="k">class</span> <span class="nc">GoogleLink</span><span class="p">(</span><span class="n">BaseOperatorLink</span><span class="p">):</span>
<span class="n">name</span> <span class="o">=</span> <span class="s2">&quot;Google&quot;</span>
<span class="k">def</span> <span class="nf">get_link</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">operator</span><span class="p">,</span> <span class="n">dttm</span><span class="p">):</span>
<span class="k">return</span> <span class="s2">&quot;https://www.google.com&quot;</span>
<span class="c1"># A list of operator extra links to override or add operator links</span>
<span class="c1"># to existing Airflow Operators.</span>
<span class="c1"># These extra links will be available on the task page in form of</span>
<span class="c1"># buttons.</span>
<span class="k">class</span> <span class="nc">S3LogLink</span><span class="p">(</span><span class="n">BaseOperatorLink</span><span class="p">):</span>
<span class="n">name</span> <span class="o">=</span> <span class="s1">&#39;S3&#39;</span>
<span class="n">operators</span> <span class="o">=</span> <span class="p">[</span><span class="n">GoogleCloudStorageToS3Operator</span><span class="p">]</span>
<span class="k">def</span> <span class="nf">get_link</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">operator</span><span class="p">,</span> <span class="n">dttm</span><span class="p">):</span>
<span class="k">return</span> <span class="s1">&#39;https://s3.amazonaws.com/airflow-logs/{dag_id}/{task_id}/{execution_date}&#39;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span>
<span class="n">dag_id</span><span class="o">=</span><span class="n">operator</span><span class="o">.</span><span class="n">dag_id</span><span class="p">,</span>
<span class="n">task_id</span><span class="o">=</span><span class="n">operator</span><span class="o">.</span><span class="n">task_id</span><span class="p">,</span>
<span class="n">execution_date</span><span class="o">=</span><span class="n">dttm</span><span class="p">,</span>
<span class="p">)</span>
<span class="c1"># Defining the plugin class</span>
<span class="k">class</span> <span class="nc">AirflowTestPlugin</span><span class="p">(</span><span class="n">AirflowPlugin</span><span class="p">):</span>
<span class="n">name</span> <span class="o">=</span> <span class="s2">&quot;test_plugin&quot;</span>
<span class="n">operators</span> <span class="o">=</span> <span class="p">[</span><span class="n">PluginOperator</span><span class="p">]</span>
<span class="n">sensors</span> <span class="o">=</span> <span class="p">[</span><span class="n">PluginSensorOperator</span><span class="p">]</span>
<span class="n">hooks</span> <span class="o">=</span> <span class="p">[</span><span class="n">PluginHook</span><span class="p">]</span>
<span class="n">executors</span> <span class="o">=</span> <span class="p">[</span><span class="n">PluginExecutor</span><span class="p">]</span>
<span class="n">macros</span> <span class="o">=</span> <span class="p">[</span><span class="n">plugin_macro</span><span class="p">]</span>
<span class="n">admin_views</span> <span class="o">=</span> <span class="p">[</span><span class="n">v</span><span class="p">]</span>
<span class="n">flask_blueprints</span> <span class="o">=</span> <span class="p">[</span><span class="n">bp</span><span class="p">]</span>
<span class="n">menu_links</span> <span class="o">=</span> <span class="p">[</span><span class="n">ml</span><span class="p">]</span>
<span class="n">appbuilder_views</span> <span class="o">=</span> <span class="p">[</span><span class="n">v_appbuilder_package</span><span class="p">]</span>
<span class="n">appbuilder_menu_items</span> <span class="o">=</span> <span class="p">[</span><span class="n">appbuilder_mitem</span><span class="p">]</span>
<span class="n">global_operator_extra_links</span> <span class="o">=</span> <span class="p">[</span><span class="n">GoogleLink</span><span class="p">(),]</span>
<span class="n">operator_extra_links</span> <span class="o">=</span> <span class="p">[</span><span class="n">S3LogLink</span><span class="p">(),</span> <span class="p">]</span>
</pre></div>
</div>
</div>
<div class="section" id="note-on-role-based-views">
<h2>Note on role based views<a class="headerlink" href="#note-on-role-based-views" title="Permalink to this headline"></a></h2>
<p>Airflow 1.10 introduced role based views using FlaskAppBuilder. You can configure which UI is used by setting
<code class="docutils literal notranslate"><span class="pre">rbac</span> <span class="pre">=</span> <span class="pre">True</span></code>. To support plugin views and links for both versions of the UI and maintain backwards compatibility,
the fields <code class="docutils literal notranslate"><span class="pre">appbuilder_views</span></code> and <code class="docutils literal notranslate"><span class="pre">appbuilder_menu_items</span></code> were added to the <code class="docutils literal notranslate"><span class="pre">AirflowTestPlugin</span></code> class.</p>
</div>
<div class="section" id="plugins-as-python-packages">
<h2>Plugins as Python packages<a class="headerlink" href="#plugins-as-python-packages" title="Permalink to this headline"></a></h2>
<p>It is possible to load plugins via <a class="reference external" href="https://packaging.python.org/guides/creating-and-discovering-plugins/#using-package-metadata">setuptools entrypoint</a> mechanism. To do this link
your plugin using an entrypoint in your package. If the package is installed, airflow
will automatically load the registered plugins from the entrypoint list.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>Neither the entrypoint name (eg, <code class="docutils literal notranslate"><span class="pre">my_plugin</span></code>) nor the name of the
plugin class will contribute towards the module and class name of the plugin
itself. The structure is determined by
<code class="docutils literal notranslate"><span class="pre">airflow.plugins_manager.AirflowPlugin.name</span></code> and the class name of the plugin
component with the pattern <code class="docutils literal notranslate"><span class="pre">airflow.{component}.{name}.{component_class_name}</span></code>.</p>
</div>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="c1"># my_package/my_plugin.py</span>
<span class="kn">from</span> <span class="nn">airflow.plugins_manager</span> <span class="kn">import</span> <span class="n">AirflowPlugin</span>
<span class="kn">from</span> <span class="nn">airflow.models</span> <span class="kn">import</span> <span class="n">BaseOperator</span>
<span class="kn">from</span> <span class="nn">airflow.hooks.base_hook</span> <span class="kn">import</span> <span class="n">BaseHook</span>
<span class="k">class</span> <span class="nc">MyOperator</span><span class="p">(</span><span class="n">BaseOperator</span><span class="p">):</span>
<span class="k">pass</span>
<span class="k">class</span> <span class="nc">MyHook</span><span class="p">(</span><span class="n">BaseHook</span><span class="p">):</span>
<span class="k">pass</span>
<span class="k">class</span> <span class="nc">MyAirflowPlugin</span><span class="p">(</span><span class="n">AirflowPlugin</span><span class="p">):</span>
<span class="n">name</span> <span class="o">=</span> <span class="s1">&#39;my_namespace&#39;</span>
<span class="n">operators</span> <span class="o">=</span> <span class="p">[</span><span class="n">MyOperator</span><span class="p">]</span>
<span class="n">hooks</span> <span class="o">=</span> <span class="p">[</span><span class="n">MyHook</span><span class="p">]</span>
</pre></div>
</div>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">setuptools</span> <span class="kn">import</span> <span class="n">setup</span>
<span class="n">setup</span><span class="p">(</span>
<span class="n">name</span><span class="o">=</span><span class="s2">&quot;my-package&quot;</span><span class="p">,</span>
<span class="o">...</span>
<span class="n">entry_points</span> <span class="o">=</span> <span class="p">{</span>
<span class="s1">&#39;airflow.plugins&#39;</span><span class="p">:</span> <span class="p">[</span>
<span class="s1">&#39;my_plugin = my_package.my_plugin:MyAirflowPlugin&#39;</span>
<span class="p">]</span>
<span class="p">}</span>
<span class="p">)</span>
</pre></div>
</div>
<dl class="simple">
<dt>This will create a hook, and an operator accessible at:</dt><dd><ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">airflow.hooks.my_namespace.MyHook</span></code></p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">airflow.operators.my_namespace.MyOperator</span></code></p></li>
</ul>
</dd>
</dl>
</div>
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<li><a class="reference internal" href="#what-for">What for?</a></li>
<li><a class="reference internal" href="#why-build-on-top-of-airflow">Why build on top of Airflow?</a></li>
<li><a class="reference internal" href="#interface">Interface</a></li>
<li><a class="reference internal" href="#example">Example</a></li>
<li><a class="reference internal" href="#note-on-role-based-views">Note on role based views</a></li>
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