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<blockquote>
<div></div></blockquote>
<div class="section" id="creating-custom-task-decorators">
<h1>Creating Custom <code class="docutils literal notranslate"><span class="pre">&#64;task</span></code> Decorators<a class="headerlink" href="#creating-custom-task-decorators" title="Permalink to this headline"></a></h1>
<p>As of Airflow 2.2 it is possible add custom decorators to the TaskFlow interface from within a provider
package and have those decorators appear natively as part of the <code class="docutils literal notranslate"><span class="pre">&#64;task.____</span></code> design.</p>
<p>For an example. Let's say you were trying to create an easier mechanism to run python functions as &quot;foo&quot;
tasks. The steps to create and register <code class="docutils literal notranslate"><span class="pre">&#64;task.foo</span></code> are:</p>
<ol class="arabic">
<li><p>Create a <code class="docutils literal notranslate"><span class="pre">FooDecoratedOperator</span></code></p>
<blockquote>
<div><p>In this case, we are assuming that you have an existing <code class="docutils literal notranslate"><span class="pre">FooOperator</span></code> that takes a python function as an
argument. By creating a <code class="docutils literal notranslate"><span class="pre">FooDecoratedOperator</span></code> that inherits from <code class="docutils literal notranslate"><span class="pre">FooOperator</span></code> and
<code class="docutils literal notranslate"><span class="pre">airflow.decorators.base.DecoratedOperator</span></code>, Airflow will supply much of the needed functionality required
to treat your new class as a taskflow native class.</p>
</div></blockquote>
</li>
<li><p>Create a <code class="docutils literal notranslate"><span class="pre">foo_task</span></code> function</p>
<blockquote>
<div><p>Once you have your decorated class, create a function that takes arguments <code class="docutils literal notranslate"><span class="pre">python_callable</span></code>, <code class="docutils literal notranslate"><span class="pre">multiple_outputs</span></code>,
and <code class="docutils literal notranslate"><span class="pre">kwargs</span></code>. This function will use the <code class="docutils literal notranslate"><span class="pre">airflow.decorators.base.task_decorator_factory</span></code> function to convert
the new <code class="docutils literal notranslate"><span class="pre">FooDecoratedOperator</span></code> into a TaskFlow function decorator!</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="k">def</span> <span class="nf">foo_task</span><span class="p">(</span>
<span class="n">python_callable</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="n">Callable</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
<span class="n">multiple_outputs</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="nb">bool</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</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="n">task_decorator_factory</span><span class="p">(</span>
<span class="n">python_callable</span><span class="o">=</span><span class="n">python_callable</span><span class="p">,</span>
<span class="n">multiple_outputs</span><span class="o">=</span><span class="n">multiple_outputs</span><span class="p">,</span>
<span class="n">decorated_operator_class</span><span class="o">=</span><span class="n">FooDecoratedOperator</span><span class="p">,</span>
<span class="o">**</span><span class="n">kwargs</span><span class="p">,</span>
<span class="p">)</span>
</pre></div>
</div>
</div></blockquote>
</li>
<li><p>Register your new decorator in get_provider_info of your provider</p>
<blockquote>
<div><p>Finally, add a key-value <code class="docutils literal notranslate"><span class="pre">task-decorators</span></code> to the dict returned from the provider entrypoint. This should be
a list with each item containing <code class="docutils literal notranslate"><span class="pre">name</span></code> and <code class="docutils literal notranslate"><span class="pre">class-name</span></code> keys. When Airflow starts, the
<code class="docutils literal notranslate"><span class="pre">ProviderManager</span></code> class will automatically import this value and <code class="docutils literal notranslate"><span class="pre">task.foo</span></code> will work as a new decorator!</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="k">def</span> <span class="nf">get_provider_info</span><span class="p">():</span>
<span class="k">return</span> <span class="p">{</span>
<span class="s2">&quot;package-name&quot;</span><span class="p">:</span> <span class="s2">&quot;foo-provider-airflow&quot;</span><span class="p">,</span>
<span class="s2">&quot;name&quot;</span><span class="p">:</span> <span class="s2">&quot;Foo&quot;</span><span class="p">,</span>
<span class="s2">&quot;task-decorators&quot;</span><span class="p">:</span> <span class="p">[</span>
<span class="p">{</span>
<span class="s2">&quot;name&quot;</span><span class="p">:</span> <span class="s2">&quot;foo&quot;</span><span class="p">,</span>
<span class="c1"># &quot;Import path&quot; and function name of the `foo_task`</span>
<span class="s2">&quot;class-name&quot;</span><span class="p">:</span> <span class="p">[</span><span class="s2">&quot;name.of.python.package.foo_task&quot;</span><span class="p">],</span>
<span class="p">}</span>
<span class="p">],</span>
<span class="c1"># ...</span>
<span class="p">}</span>
</pre></div>
</div>
<p>Please note that the <code class="docutils literal notranslate"><span class="pre">name</span></code> must be a valid python identifier.</p>
</div></blockquote>
</li>
</ol>
</div>
<div class="section" id="optional-adding-ide-auto-completion-support">
<h1>(Optional) Adding IDE auto-completion support<a class="headerlink" href="#optional-adding-ide-auto-completion-support" title="Permalink to this headline"></a></h1>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>This section mostly applies to the apache-airflow managed providers. We have not decided if we will allow third-party providers to register auto-completion in this way.</p>
</div>
<p>For better or worse, Python IDEs can not auto-complete dynamically
generated methods (see <a class="reference external" href="https://intellij-support.jetbrains.com/hc/en-us/community/posts/115000665110-auto-completion-for-dynamic-module-attributes-in-python">JetBrain's write up on the subject</a>).</p>
<p>To get around this, we had to find a solution that was &quot;best possible.&quot; IDEs will only allow typing
through stub files, but we wanted to avoid any situation where a user would update their provider and the auto-complete
would be out of sync with the provider's actual parameters.</p>
<p>To hack around this problem, we found that you could extend the <code class="docutils literal notranslate"><span class="pre">_TaskDecorator</span></code> class in the <code class="docutils literal notranslate"><span class="pre">airflow/decorators/__init__.py</span></code> inside an <code class="docutils literal notranslate"><span class="pre">if</span> <span class="pre">TYPE_CHECKING</span></code> block
and the correct auto-complete will show up in the IDE.</p>
<p>The first step is to create a <code class="docutils literal notranslate"><span class="pre">Mixin</span></code> class for your decorator.</p>
<p>Mixin classes are classes in python that tell the python interpreter that python can import them at any time.
Because they are not dependent on other classes, Mixin classes are great for multiple inheritance.</p>
<p>In the DockerDecorator we created a Mixin class that looks like this:</p>
<div class="example-block-wrapper docutils container">
<p class="example-header example-header--with-button"><span class="example-title">airflow/providers/docker/decorators/docker.py</span><a class="example-header-button viewcode-button reference internal" href="../_modules/airflow/providers/docker/decorators/docker.html"><span class="viewcode-link">[source]</span></a></p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="k">class</span> <span class="nc">DockerDecoratorMixin</span><span class="p">:</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Helper class for inheritance. This class is only used during type checking or auto-completion</span>
<span class="sd"> :meta private:</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="k">def</span> <span class="nf">docker</span><span class="p">(</span>
<span class="bp">self</span><span class="p">,</span>
<span class="n">multiple_outputs</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="nb">bool</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
<span class="n">use_dill</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">False</span><span class="p">,</span>
<span class="n">image</span><span class="p">:</span> <span class="nb">str</span> <span class="o">=</span> <span class="s2">&quot;&quot;</span><span class="p">,</span>
<span class="n">api_version</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
<span class="n">container_name</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
<span class="n">cpus</span><span class="p">:</span> <span class="nb">float</span> <span class="o">=</span> <span class="mf">1.0</span><span class="p">,</span>
<span class="n">docker_url</span><span class="p">:</span> <span class="nb">str</span> <span class="o">=</span> <span class="s1">&#39;unix://var/run/docker.sock&#39;</span><span class="p">,</span>
<span class="n">environment</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="n">Dict</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
<span class="n">private_environment</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="n">Dict</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
<span class="n">force_pull</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">False</span><span class="p">,</span>
<span class="n">mem_limit</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="n">Union</span><span class="p">[</span><span class="nb">float</span><span class="p">,</span> <span class="nb">str</span><span class="p">]]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
<span class="n">host_tmp_dir</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
<span class="n">network_mode</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
<span class="n">tls_ca_cert</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
<span class="n">tls_client_cert</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
<span class="n">tls_client_key</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
<span class="n">tls_hostname</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="n">Union</span><span class="p">[</span><span class="nb">str</span><span class="p">,</span> <span class="nb">bool</span><span class="p">]]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
<span class="n">tls_ssl_version</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
<span class="n">tmp_dir</span><span class="p">:</span> <span class="nb">str</span> <span class="o">=</span> <span class="s1">&#39;/tmp/airflow&#39;</span><span class="p">,</span>
<span class="n">user</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="n">Union</span><span class="p">[</span><span class="nb">str</span><span class="p">,</span> <span class="nb">int</span><span class="p">]]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
<span class="n">mounts</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="n">List</span><span class="p">[</span><span class="nb">str</span><span class="p">]]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
<span class="n">working_dir</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
<span class="n">xcom_all</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">False</span><span class="p">,</span>
<span class="n">docker_conn_id</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
<span class="n">dns</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="n">List</span><span class="p">[</span><span class="nb">str</span><span class="p">]]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
<span class="n">dns_search</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="n">List</span><span class="p">[</span><span class="nb">str</span><span class="p">]]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
<span class="n">auto_remove</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">False</span><span class="p">,</span>
<span class="n">shm_size</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="nb">int</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
<span class="n">tty</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">False</span><span class="p">,</span>
<span class="n">privileged</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">False</span><span class="p">,</span>
<span class="n">cap_add</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="n">Iterable</span><span class="p">[</span><span class="nb">str</span><span class="p">]]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
<span class="n">extra_hosts</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="n">Dict</span><span class="p">[</span><span class="nb">str</span><span class="p">,</span> <span class="nb">str</span><span class="p">]]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
<span class="o">**</span><span class="n">kwargs</span><span class="p">,</span>
<span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> :param python_callable: A python function with no references to outside variables,</span>
<span class="sd"> defined with def, which will be run in a virtualenv</span>
<span class="sd"> :type python_callable: function</span>
<span class="sd"> :param multiple_outputs: if set, function return value will be</span>
<span class="sd"> unrolled to multiple XCom values. List/Tuples will unroll to xcom values</span>
<span class="sd"> with index as key. Dict will unroll to xcom values with keys as XCom keys.</span>
<span class="sd"> Defaults to False.</span>
<span class="sd"> :type multiple_outputs: bool</span>
<span class="sd"> :param use_dill: Whether to use dill or pickle for serialization</span>
<span class="sd"> :type use_dill: bool</span>
<span class="sd"> :param image: Docker image from which to create the container.</span>
<span class="sd"> If image tag is omitted, &quot;latest&quot; will be used.</span>
<span class="sd"> :type image: str</span>
<span class="sd"> :param api_version: Remote API version. Set to ``auto`` to automatically</span>
<span class="sd"> detect the server&#39;s version.</span>
<span class="sd"> :type api_version: str</span>
<span class="sd"> :param container_name: Name of the container. Optional (templated)</span>
<span class="sd"> :type container_name: str or None</span>
<span class="sd"> :param cpus: Number of CPUs to assign to the container.</span>
<span class="sd"> This value gets multiplied with 1024. See</span>
<span class="sd"> https://docs.docker.com/engine/reference/run/#cpu-share-constraint</span>
<span class="sd"> :type cpus: float</span>
<span class="sd"> :param docker_url: URL of the host running the docker daemon.</span>
<span class="sd"> Default is unix://var/run/docker.sock</span>
<span class="sd"> :type docker_url: str</span>
<span class="sd"> :param environment: Environment variables to set in the container. (templated)</span>
<span class="sd"> :type environment: dict</span>
<span class="sd"> :param private_environment: Private environment variables to set in the container.</span>
<span class="sd"> These are not templated, and hidden from the website.</span>
<span class="sd"> :type private_environment: dict</span>
<span class="sd"> :param force_pull: Pull the docker image on every run. Default is False.</span>
<span class="sd"> :type force_pull: bool</span>
<span class="sd"> :param mem_limit: Maximum amount of memory the container can use.</span>
<span class="sd"> Either a float value, which represents the limit in bytes,</span>
<span class="sd"> or a string like ``128m`` or ``1g``.</span>
<span class="sd"> :type mem_limit: float or str</span>
<span class="sd"> :param host_tmp_dir: Specify the location of the temporary directory on the host which will</span>
<span class="sd"> be mapped to tmp_dir. If not provided defaults to using the standard system temp directory.</span>
<span class="sd"> :type host_tmp_dir: str</span>
<span class="sd"> :param network_mode: Network mode for the container.</span>
<span class="sd"> :type network_mode: str</span>
<span class="sd"> :param tls_ca_cert: Path to a PEM-encoded certificate authority</span>
<span class="sd"> to secure the docker connection.</span>
<span class="sd"> :type tls_ca_cert: str</span>
<span class="sd"> :param tls_client_cert: Path to the PEM-encoded certificate</span>
<span class="sd"> used to authenticate docker client.</span>
<span class="sd"> :type tls_client_cert: str</span>
<span class="sd"> :param tls_client_key: Path to the PEM-encoded key used to authenticate docker client.</span>
<span class="sd"> :type tls_client_key: str</span>
<span class="sd"> :param tls_hostname: Hostname to match against</span>
<span class="sd"> the docker server certificate or False to disable the check.</span>
<span class="sd"> :type tls_hostname: str or bool</span>
<span class="sd"> :param tls_ssl_version: Version of SSL to use when communicating with docker daemon.</span>
<span class="sd"> :type tls_ssl_version: str</span>
<span class="sd"> :param tmp_dir: Mount point inside the container to</span>
<span class="sd"> a temporary directory created on the host by the operator.</span>
<span class="sd"> The path is also made available via the environment variable</span>
<span class="sd"> ``AIRFLOW_TMP_DIR`` inside the container.</span>
<span class="sd"> :type tmp_dir: str</span>
<span class="sd"> :param user: Default user inside the docker container.</span>
<span class="sd"> :type user: int or str</span>
<span class="sd"> :param mounts: List of mounts to mount into the container, e.g.</span>
<span class="sd"> ``[&#39;/host/path:/container/path&#39;, &#39;/host/path2:/container/path2:ro&#39;]``.</span>
<span class="sd"> :type mounts: list</span>
<span class="sd"> :param working_dir: Working directory to</span>
<span class="sd"> set on the container (equivalent to the -w switch the docker client)</span>
<span class="sd"> :type working_dir: str</span>
<span class="sd"> :param xcom_all: Push all the stdout or just the last line.</span>
<span class="sd"> The default is False (last line).</span>
<span class="sd"> :type xcom_all: bool</span>
<span class="sd"> :param docker_conn_id: ID of the Airflow connection to use</span>
<span class="sd"> :type docker_conn_id: str</span>
<span class="sd"> :param dns: Docker custom DNS servers</span>
<span class="sd"> :type dns: list[str]</span>
<span class="sd"> :param dns_search: Docker custom DNS search domain</span>
<span class="sd"> :type dns_search: list[str]</span>
<span class="sd"> :param auto_remove: Auto-removal of the container on daemon side when the</span>
<span class="sd"> container&#39;s process exits.</span>
<span class="sd"> The default is False.</span>
<span class="sd"> :type auto_remove: bool</span>
<span class="sd"> :param shm_size: Size of ``/dev/shm`` in bytes. The size must be</span>
<span class="sd"> greater than 0. If omitted uses system default.</span>
<span class="sd"> :type shm_size: int</span>
<span class="sd"> :param tty: Allocate pseudo-TTY to the container</span>
<span class="sd"> This needs to be set see logs of the Docker container.</span>
<span class="sd"> :type tty: bool</span>
<span class="sd"> :param privileged: Give extended privileges to this container.</span>
<span class="sd"> :type privileged: bool</span>
<span class="sd"> :param cap_add: Include container capabilities</span>
<span class="sd"> :type cap_add: list[str]</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="o">...</span>
</pre></div>
</div>
</div>
<p>Notice that the function does not actually need to return anything as we only use this class for type checking. Sadly you will have to duplicate the args, defaults and types from your real FooOperator in order for them to show up in auto-completion prompts.</p>
<p>Once you have your Mixin class ready, go to <code class="docutils literal notranslate"><span class="pre">airflow/decorators/__init__.py</span></code> and add section similar to this</p>
<div class="example-block-wrapper docutils container">
<p class="example-header example-header--with-button"><span class="example-title">airflow/decorators/__init__.py</span><a class="example-header-button viewcode-button reference internal" href="../_modules/airflow/decorators/__init__.html"><span class="viewcode-link">[source]</span></a></p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="n">TYPE_CHECKING</span><span class="p">:</span>
<span class="k">try</span><span class="p">:</span>
<span class="kn">from</span> <span class="nn">airflow.providers.docker.decorators.docker</span> <span class="kn">import</span> <span class="n">DockerDecoratorMixin</span>
<span class="k">class</span> <span class="nc">_DockerTask</span><span class="p">(</span><span class="n">_TaskDecorator</span><span class="p">,</span> <span class="n">DockerDecoratorMixin</span><span class="p">):</span>
<span class="k">pass</span>
<span class="n">_TaskDecorator</span> <span class="o">=</span> <span class="n">_DockerTask</span>
<span class="k">except</span> <span class="ne">ImportError</span><span class="p">:</span>
<span class="k">pass</span>
</pre></div>
</div>
</div>
<p>The <code class="docutils literal notranslate"><span class="pre">if</span> <span class="pre">TYPE_CHECKING</span></code> guard means that this code will only be used for type checking (such as mypy) or generating IDE auto-completion. Catching the <code class="docutils literal notranslate"><span class="pre">ImportError</span></code> is important as</p>
<p>Once the change is merged and the next Airflow (minor or patch) release comes out, users will be able to see your decorator in IDE auto-complete. This auto-complete will change based on the version of the provider that the user has installed.</p>
<p>Please note that this step is not required to create a working decorator but does create a better experience for users of the provider.</p>
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