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| <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>A set of tools to parse Hive logs and expose Hive metadata (CPU /IO / phases/ skew /…)</li> |
| <li>An anomaly detection framework, allowing people to collect metrics, set thresholds and alerts</li> |
| <li>An auditing tool, helping understand who accesses what</li> |
| <li>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</li> |
| <li>…</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>A web server you can use to render your views</li> |
| <li>A metadata database to store your models</li> |
| <li>Access to your databases, and knowledge of how to connect to them</li> |
| <li>An array of workers that your application can push workload to</li> |
| <li>Airflow is deployed, you can just piggy back on its deployment logistics</li> |
| <li>Basic charting capabilities, underlying libraries and abstractions</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="code python highlight-default 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="kc">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> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="example"> |
| <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="code python highlight-default 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="k">import</span> <span class="n">AirflowPlugin</span> |
| |
| <span class="kn">from</span> <span class="nn">flask</span> <span class="k">import</span> <span class="n">Blueprint</span> |
| <span class="kn">from</span> <span class="nn">flask_admin</span> <span class="k">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="k">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="k">import</span> <span class="n">BaseHook</span> |
| <span class="kn">from</span> <span class="nn">airflow.models</span> <span class="k">import</span> <span class="n">BaseOperator</span> |
| <span class="kn">from</span> <span class="nn">airflow.sensors.base_sensor_operator</span> <span class="k">import</span> <span class="n">BaseSensorOperator</span> |
| <span class="kn">from</span> <span class="nn">airflow.executors.base_executor</span> <span class="k">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="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">'/'</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">"test_plugin/test.html"</span><span class="p">,</span> <span class="n">content</span><span class="o">=</span><span class="s2">"Hello galaxy!"</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">"Test Plugin"</span><span class="p">,</span> <span class="n">name</span><span class="o">=</span><span class="s2">"Test View"</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">"test_plugin"</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">'templates'</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">'static'</span><span class="p">,</span> |
| <span class="n">static_url_path</span><span class="o">=</span><span class="s1">'/static/test_plugin'</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">'Test Plugin'</span><span class="p">,</span> |
| <span class="n">name</span><span class="o">=</span><span class="s1">'Test Menu Link'</span><span class="p">,</span> |
| <span class="n">url</span><span class="o">=</span><span class="s1">'https://airflow.apache.org/'</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">"/"</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">"test_plugin/test.html"</span><span class="p">,</span> <span class="n">content</span><span class="o">=</span><span class="s2">"Hello galaxy!"</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">"name"</span><span class="p">:</span> <span class="s2">"Test View"</span><span class="p">,</span> |
| <span class="s2">"category"</span><span class="p">:</span> <span class="s2">"Test Plugin"</span><span class="p">,</span> |
| <span class="s2">"view"</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">"name"</span><span class="p">:</span> <span class="s2">"Google"</span><span class="p">,</span> |
| <span class="s2">"category"</span><span class="p">:</span> <span class="s2">"Search"</span><span class="p">,</span> |
| <span class="s2">"category_icon"</span><span class="p">:</span> <span class="s2">"fa-th"</span><span class="p">,</span> |
| <span class="s2">"href"</span><span class="p">:</span> <span class="s2">"https://www.google.com"</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">"test_plugin"</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> |
| </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 |
| rbac = True. To support plugin views and links for both versions of the UI and maintain backwards compatibility, |
| the fields appbuilder_views and appbuilder_menu_items were added to the AirflowTestPlugin 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 href="#id1"><span class="problematic" id="id2">`setuptools' entrypoint<https://packaging.python.org/guides/creating-and-discovering-plugins/#using-package-metadata>`_</span></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> |
| <p>_Note_: Neither the entrypoint name (eg, <cite>my_plugin</cite>) nor the name of the |
| plugin class will contribute towards the module and class name of the plugin |
| itself. The structure is determined by |
| <cite>airflow.plugins_manager.AirflowPlugin.name</cite> and the class name of the plugin |
| component with the pattern <cite>airflow.{component}.{name}.{component_class_name}</cite>.</p> |
| <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">'my_namespace'</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">"my-package"</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">'airflow.plugins'</span><span class="p">:</span> <span class="p">[</span> |
| <span class="s1">'my_plugin = my_package.my_plugin:MyAirflowPlugin'</span> |
| <span class="p">]</span> |
| <span class="p">}</span> |
| <span class="p">)</span> |
| </pre></div> |
| </div> |
| <dl class="docutils"> |
| <dt>This will create a hook, and an operator accessible at:</dt> |
| <dd><ul class="first last simple"> |
| <li><cite>airflow.hooks.my_namespace.MyHook</cite></li> |
| <li><cite>airflow.operators.my_namespace.MyOperator</cite></li> |
| </ul> |
| </dd> |
| </dl> |
| </div> |
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