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<h1 id="resource-stack-cluster-feature">Resource Stack (Cluster Feature)<a class="headerlink" href="#resource-stack-cluster-feature" title="Permanent link">#</a></h1>
<p>A cluster feature is a set of Kubernetes resources that can be applied to and managed within the active cluster.
The <code>Renderer.K8sApi.ResourceStack</code> class provides the functionality to input and apply kubernetes resources to a cluster.
It is up to the extension developer to manage the life cycle of the resource stack.
It could be applied automatically to a cluster by the extension, or the end-user could be required to install it.</p>
<p>The code examples in this section show how to create a resource stack, and define a cluster feature that is configurable from the cluster <strong>Settings</strong> page.</p>
<div class="admonition info">
<p class="admonition-title">Info</p>
<p>To access the cluster <strong>Settings</strong> page, right-click the relevant cluster in the left side menu and click <strong>Settings</strong>.</p>
</div>
<p>The resource stack in this example consists of a single kubernetes resource:</p>
<div class="highlight"><pre><span></span><code><span class="nt">apiVersion</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">v1</span>
<span class="nt">kind</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">Pod</span>
<span class="nt">metadata</span><span class="p">:</span>
<span class="nt">name</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">example-pod</span>
<span class="nt">spec</span><span class="p">:</span>
<span class="nt">containers</span><span class="p">:</span>
<span class="p p-Indicator">-</span> <span class="nt">name</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">example-pod</span>
<span class="nt">image</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">nginx</span>
</code></pre></div>
<p>It is simply a pod named <code>example-pod</code>, running nginx. Assume this content is in the file <code>../resources/example-pod.yml</code>.</p>
<p>The following code sample shows how to use the <code>Renderer.K8sApi.ResourceStack</code> to manage installing and uninstalling this resource stack:</p>
<div class="highlight"><pre><span></span><code><span class="k">import</span> <span class="p">{</span> <span class="nx">Renderer</span><span class="p">,</span> <span class="nx">Common</span> <span class="p">}</span> <span class="kr">from</span> <span class="s2">&quot;@k8slens/extensions&quot;</span><span class="p">;</span>
<span class="k">import</span> <span class="o">*</span> <span class="kr">as</span> <span class="nx">path</span> <span class="kr">from</span> <span class="s2">&quot;path&quot;</span><span class="p">;</span>
<span class="kd">const</span> <span class="p">{</span>
<span class="nx">K8sApi</span><span class="o">:</span> <span class="p">{</span>
<span class="nx">ResourceStack</span><span class="p">,</span>
<span class="nx">forCluster</span><span class="p">,</span>
<span class="nx">Pod</span><span class="p">,</span>
<span class="p">}</span>
<span class="p">}</span> <span class="o">=</span> <span class="nx">Renderer</span><span class="p">;</span>
<span class="kr">type</span> <span class="nx">ResourceStack</span> <span class="o">=</span> <span class="nx">Renderer</span><span class="p">.</span><span class="nx">K8sApi</span><span class="p">.</span><span class="nx">ResourceStack</span><span class="p">;</span>
<span class="kr">type</span> <span class="nx">Pod</span> <span class="o">=</span> <span class="nx">Renderer</span><span class="p">.</span><span class="nx">K8sApi</span><span class="p">.</span><span class="nx">Pod</span><span class="p">;</span>
<span class="kr">type</span> <span class="nx">KubernetesCluster</span> <span class="o">=</span> <span class="nx">Common</span><span class="p">.</span><span class="nx">Catalog</span><span class="p">.</span><span class="nx">KubernetesCluster</span><span class="p">;</span>
<span class="k">export</span> <span class="kd">class</span> <span class="nx">ExampleClusterFeature</span> <span class="p">{</span>
<span class="k">protected</span> <span class="nx">stack</span>: <span class="kt">ResourceStack</span><span class="p">;</span>
<span class="kr">constructor</span><span class="p">(</span><span class="k">protected</span> <span class="nx">cluster</span>: <span class="kt">KubernetesCluster</span><span class="p">)</span> <span class="p">{</span>
<span class="k">this</span><span class="p">.</span><span class="nx">stack</span> <span class="o">=</span> <span class="ow">new</span> <span class="nx">ResourceStack</span><span class="p">(</span><span class="nx">cluster</span><span class="p">,</span> <span class="s2">&quot;example-resource-stack&quot;</span><span class="p">);</span>
<span class="p">}</span>
<span class="nx">get</span> <span class="nx">resourceFolder</span><span class="p">()</span> <span class="p">{</span>
<span class="k">return</span> <span class="nx">path</span><span class="p">.</span><span class="nx">join</span><span class="p">(</span><span class="nx">__dirname</span><span class="p">,</span> <span class="s2">&quot;../resources/&quot;</span><span class="p">);</span>
<span class="p">}</span>
<span class="nx">install</span><span class="p">()</span><span class="o">:</span> <span class="nb">Promise</span><span class="o">&lt;</span><span class="kt">string</span><span class="o">&gt;</span> <span class="p">{</span>
<span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="s2">&quot;installing example-pod&quot;</span><span class="p">);</span>
<span class="k">return</span> <span class="k">this</span><span class="p">.</span><span class="nx">stack</span><span class="p">.</span><span class="nx">kubectlApplyFolder</span><span class="p">(</span><span class="k">this</span><span class="p">.</span><span class="nx">resourceFolder</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">async</span> <span class="nx">isInstalled</span><span class="p">()</span><span class="o">:</span> <span class="nb">Promise</span><span class="o">&lt;</span><span class="kt">boolean</span><span class="o">&gt;</span> <span class="p">{</span>
<span class="k">try</span> <span class="p">{</span>
<span class="kd">const</span> <span class="nx">podApi</span> <span class="o">=</span> <span class="nx">forCluster</span><span class="p">(</span><span class="k">this</span><span class="p">.</span><span class="nx">cluster</span><span class="p">,</span> <span class="nx">Pod</span><span class="p">);</span>
<span class="kd">const</span> <span class="nx">examplePod</span> <span class="o">=</span> <span class="k">await</span> <span class="nx">podApi</span><span class="p">.</span><span class="nx">get</span><span class="p">({</span><span class="nx">name</span><span class="o">:</span> <span class="s2">&quot;example-pod&quot;</span><span class="p">,</span> <span class="nx">namespace</span><span class="o">:</span> <span class="s2">&quot;default&quot;</span><span class="p">});</span>
<span class="k">if</span> <span class="p">(</span><span class="nx">examplePod</span><span class="o">?</span><span class="p">.</span><span class="nx">kind</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="s2">&quot;found example-pod&quot;</span><span class="p">);</span>
<span class="k">return</span> <span class="kc">true</span><span class="p">;</span>
<span class="p">}</span>
<span class="p">}</span> <span class="k">catch</span><span class="p">(</span><span class="nx">e</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="s2">&quot;Error getting example-pod:&quot;</span><span class="p">,</span> <span class="nx">e</span><span class="p">);</span>
<span class="p">}</span>
<span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="s2">&quot;didn&#39;t find example-pod&quot;</span><span class="p">);</span>
<span class="k">return</span> <span class="kc">false</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">async</span> <span class="nx">uninstall</span><span class="p">()</span><span class="o">:</span> <span class="nb">Promise</span><span class="o">&lt;</span><span class="kt">string</span><span class="o">&gt;</span> <span class="p">{</span>
<span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="s2">&quot;uninstalling example-pod&quot;</span><span class="p">);</span>
<span class="k">return</span> <span class="k">this</span><span class="p">.</span><span class="nx">stack</span><span class="p">.</span><span class="nx">kubectlDeleteFolder</span><span class="p">(</span><span class="k">this</span><span class="p">.</span><span class="nx">resourceFolder</span><span class="p">);</span>
<span class="p">}</span>
<span class="p">}</span>
</code></pre></div>
<p>The <code>ExampleClusterFeature</code> class constructor takes a <code>Common.Catalog.KubernetesCluster</code> argument.
This is the cluster that the resource stack will be applied to, and the constructor instantiates a <code>Renderer.K8sApi.ResourceStack</code> as such.
<code>ExampleClusterFeature</code> implements an <code>install()</code> method which simply invokes the <code>kubectlApplyFolder()</code> method of the <code>Renderer.K8sApi.ResourceStack</code> class.
<code>kubectlApplyFolder()</code> applies to the cluster all kubernetes resources found in the folder passed to it, in this case <code>../resources</code>.
Similarly, <code>ExampleClusterFeature</code> implements an <code>uninstall()</code> method which simply invokes the <code>kubectlDeleteFolder()</code> method of the <code>Renderer.K8sApi.ResourceStack</code> class.
<code>kubectlDeleteFolder()</code> tries to delete from the cluster all kubernetes resources found in the folder passed to it, again in this case <code>../resources</code>.</p>
<p><code>ExampleClusterFeature</code> also implements an <code>isInstalled()</code> method, which demonstrates how you can utilize the kubernetes api to inspect the resource stack status.
<code>isInstalled()</code> simply tries to find a pod named <code>example-pod</code>, as a way to determine if the pod is already installed.
This method can be useful in creating a context-sensitive UI for installing/uninstalling the feature, as demonstrated in the next sample code.</p>
<p>To allow the end-user to control the life cycle of this cluster feature the following code sample shows how to implement a user interface based on React and custom Lens UI components:</p>
<div class="highlight"><pre><span></span><code> <span class="k">import</span> <span class="nx">React</span> <span class="kr">from</span> <span class="s2">&quot;react&quot;</span><span class="p">;</span>
<span class="k">import</span> <span class="p">{</span> <span class="nx">Common</span><span class="p">,</span> <span class="nx">Renderer</span> <span class="p">}</span> <span class="kr">from</span> <span class="s2">&quot;@k8slens/extensions&quot;</span><span class="p">;</span>
<span class="k">import</span> <span class="p">{</span> <span class="nx">observer</span> <span class="p">}</span> <span class="kr">from</span> <span class="s2">&quot;mobx-react&quot;</span><span class="p">;</span>
<span class="k">import</span> <span class="p">{</span> <span class="nx">computed</span><span class="p">,</span> <span class="nx">observable</span><span class="p">,</span> <span class="nx">makeObservable</span> <span class="p">}</span> <span class="kr">from</span> <span class="s2">&quot;mobx&quot;</span><span class="p">;</span>
<span class="k">import</span> <span class="p">{</span> <span class="nx">ExampleClusterFeature</span> <span class="p">}</span> <span class="kr">from</span> <span class="s2">&quot;./example-cluster-feature&quot;</span><span class="p">;</span>
<span class="kd">const</span> <span class="p">{</span>
<span class="nx">Component</span><span class="o">:</span> <span class="p">{</span>
<span class="nx">SubTitle</span><span class="p">,</span> <span class="nx">Button</span><span class="p">,</span>
<span class="p">}</span>
<span class="p">}</span> <span class="o">=</span> <span class="nx">Renderer</span><span class="p">;</span>
<span class="kd">interface</span> <span class="nx">Props</span> <span class="p">{</span>
<span class="nx">cluster</span>: <span class="kt">Common.Catalog.KubernetesCluster</span><span class="p">;</span>
<span class="p">}</span>
<span class="kd">@observer</span>
<span class="k">export</span> <span class="kd">class</span> <span class="nx">ExampleClusterFeatureSettings</span> <span class="k">extends</span> <span class="nx">React</span><span class="p">.</span><span class="nx">Component</span><span class="o">&lt;</span><span class="nx">Props</span><span class="o">&gt;</span> <span class="p">{</span>
<span class="kr">constructor</span><span class="p">(</span><span class="nx">props</span>: <span class="kt">Props</span><span class="p">)</span> <span class="p">{</span>
<span class="k">super</span><span class="p">(</span><span class="nx">props</span><span class="p">);</span>
<span class="nx">makeObservable</span><span class="p">(</span><span class="k">this</span><span class="p">);</span>
<span class="p">}</span>
<span class="kd">@observable</span> <span class="nx">installed</span> <span class="o">=</span> <span class="kc">false</span><span class="p">;</span>
<span class="kd">@observable</span> <span class="nx">inProgress</span> <span class="o">=</span> <span class="kc">false</span><span class="p">;</span>
<span class="nx">feature</span>: <span class="kt">ExampleClusterFeature</span><span class="p">;</span>
<span class="k">async</span> <span class="nx">componentDidMount</span><span class="p">()</span> <span class="p">{</span>
<span class="k">this</span><span class="p">.</span><span class="nx">feature</span> <span class="o">=</span> <span class="ow">new</span> <span class="nx">ExampleClusterFeature</span><span class="p">(</span><span class="k">this</span><span class="p">.</span><span class="nx">props</span><span class="p">.</span><span class="nx">cluster</span><span class="p">);</span>
<span class="k">await</span> <span class="k">this</span><span class="p">.</span><span class="nx">updateFeatureState</span><span class="p">();</span>
<span class="p">}</span>
<span class="k">async</span> <span class="nx">updateFeatureState</span><span class="p">()</span> <span class="p">{</span>
<span class="k">this</span><span class="p">.</span><span class="nx">installed</span> <span class="o">=</span> <span class="k">await</span> <span class="k">this</span><span class="p">.</span><span class="nx">feature</span><span class="p">.</span><span class="nx">isInstalled</span><span class="p">();</span>
<span class="p">}</span>
<span class="k">async</span> <span class="nx">save</span><span class="p">()</span> <span class="p">{</span>
<span class="k">this</span><span class="p">.</span><span class="nx">inProgress</span> <span class="o">=</span> <span class="kc">true</span><span class="p">;</span>
<span class="k">try</span> <span class="p">{</span>
<span class="k">if</span> <span class="p">(</span><span class="k">this</span><span class="p">.</span><span class="nx">installed</span><span class="p">)</span> <span class="p">{</span>
<span class="k">await</span> <span class="k">this</span><span class="p">.</span><span class="nx">feature</span><span class="p">.</span><span class="nx">uninstall</span><span class="p">();</span>
<span class="p">}</span> <span class="k">else</span> <span class="p">{</span>
<span class="k">await</span> <span class="k">this</span><span class="p">.</span><span class="nx">feature</span><span class="p">.</span><span class="nx">install</span><span class="p">();</span>
<span class="p">}</span>
<span class="p">}</span> <span class="k">finally</span> <span class="p">{</span>
<span class="k">this</span><span class="p">.</span><span class="nx">inProgress</span> <span class="o">=</span> <span class="kc">false</span><span class="p">;</span>
<span class="k">await</span> <span class="k">this</span><span class="p">.</span><span class="nx">updateFeatureState</span><span class="p">();</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="kd">@computed</span> <span class="nx">get</span> <span class="nx">buttonLabel</span><span class="p">()</span> <span class="p">{</span>
<span class="k">if</span> <span class="p">(</span><span class="k">this</span><span class="p">.</span><span class="nx">inProgress</span> <span class="o">&amp;&amp;</span> <span class="k">this</span><span class="p">.</span><span class="nx">installed</span><span class="p">)</span> <span class="k">return</span> <span class="s2">&quot;Uninstalling ...&quot;</span><span class="p">;</span>
<span class="k">if</span> <span class="p">(</span><span class="k">this</span><span class="p">.</span><span class="nx">inProgress</span><span class="p">)</span> <span class="k">return</span> <span class="s2">&quot;Applying ...&quot;</span><span class="p">;</span>
<span class="k">if</span> <span class="p">(</span><span class="k">this</span><span class="p">.</span><span class="nx">installed</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="s2">&quot;Uninstall&quot;</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">return</span> <span class="s2">&quot;Apply&quot;</span><span class="p">;</span>
<span class="p">}</span>
<span class="nx">render</span><span class="p">()</span> <span class="p">{</span>
<span class="k">return</span> <span class="p">(</span>
<span class="o">&lt;&gt;</span>
<span class="o">&lt;</span><span class="nx">section</span><span class="o">&gt;</span>
<span class="o">&lt;</span><span class="nx">SubTitle</span> <span class="nx">title</span><span class="o">=</span><span class="s2">&quot;Example Cluster Feature using a Resource Stack&quot;</span> <span class="o">/&gt;</span>
<span class="o">&lt;</span><span class="nx">Button</span>
<span class="nx">label</span><span class="o">=</span><span class="p">{</span><span class="k">this</span><span class="p">.</span><span class="nx">buttonLabel</span><span class="p">}</span>
<span class="nx">waiting</span><span class="o">=</span><span class="p">{</span><span class="k">this</span><span class="p">.</span><span class="nx">inProgress</span><span class="p">}</span>
<span class="nx">onClick</span><span class="o">=</span><span class="p">{()</span> <span class="p">=&gt;</span> <span class="k">this</span><span class="p">.</span><span class="nx">save</span><span class="p">()}</span>
<span class="nx">primary</span> <span class="o">/&gt;</span>
<span class="o">&lt;</span><span class="err">/section&gt;</span>
<span class="o">&lt;</span><span class="err">/&gt;</span>
<span class="p">);</span>
<span class="p">}</span>
<span class="p">}</span>
</code></pre></div>
<p>The <code>ExampleClusterFeatureSettings</code> class extends <code>React.Component</code> and simply renders a subtitle and a button.
<code>ExampleClusterFeatureSettings</code> takes the cluster as a prop and when the React component has mounted the <code>ExampleClusterFeature</code> is instantiated using this cluster (in <code>componentDidMount()</code>).
The rest of the logic concerns the button appearance and action, based on the <code>ExampleClusterFeatureSettings</code> fields <code>installed</code> and <code>inProgress</code>.
The <code>installed</code> value is of course determined using the aforementioned <code>ExampleClusterFeature</code> method <code>isInstalled()</code>.
The <code>inProgress</code> value is true while waiting for the feature to be installed (or uninstalled).</p>
<p>Note that the button is a <code>Renderer.Component.Button</code> element and this example takes advantage of its <code>waiting</code> prop to show a "waiting" animation while the install (or uninstall) is in progress.
Using elements from <code>Renderer.Component</code> is encouraged, to take advantage of their built-in properties, and to ensure a common look and feel.</p>
<p>Also note that <a href="https://mobx.js.org/README.html">MobX 6</a> is used for state management, ensuring that the UI is rerendered when state has changed.
The <code>ExampleClusterFeatureSettings</code> class is marked as an <code>@observer</code>, and its constructor must call <code>makeObservable()</code>.
As well, the <code>installed</code> and <code>inProgress</code> fields are marked as <code>@observable</code>, ensuring that the button gets rerendered any time these fields change.</p>
<p>Finally, <code>ExampleClusterFeatureSettings</code> needs to be connected to the extension, and would typically appear on the cluster <strong>Settings</strong> page via a <code>Renderer.LensExtension.entitySettings</code> entry.
The <code>ExampleExtension</code> would look like this:</p>
<div class="highlight"><pre><span></span><code><span class="k">import</span> <span class="p">{</span> <span class="nx">Common</span><span class="p">,</span> <span class="nx">Renderer</span> <span class="p">}</span> <span class="kr">from</span> <span class="s2">&quot;@k8slens/extensions&quot;</span><span class="p">;</span>
<span class="k">import</span> <span class="p">{</span> <span class="nx">ExampleClusterFeatureSettings</span> <span class="p">}</span> <span class="kr">from</span> <span class="s2">&quot;./src/example-cluster-feature-settings&quot;</span>
<span class="k">import</span> <span class="nx">React</span> <span class="kr">from</span> <span class="s2">&quot;react&quot;</span>
<span class="k">export</span> <span class="k">default</span> <span class="kd">class</span> <span class="nx">ExampleExtension</span> <span class="k">extends</span> <span class="nx">Renderer</span><span class="p">.</span><span class="nx">LensExtension</span> <span class="p">{</span>
<span class="nx">entitySettings</span> <span class="o">=</span> <span class="p">[</span>
<span class="p">{</span>
<span class="nx">apiVersions</span><span class="o">:</span> <span class="p">[</span><span class="s2">&quot;entity.k8slens.dev/v1alpha1&quot;</span><span class="p">],</span>
<span class="nx">kind</span><span class="o">:</span> <span class="s2">&quot;KubernetesCluster&quot;</span><span class="p">,</span>
<span class="nx">title</span><span class="o">:</span> <span class="s2">&quot;Example Cluster Feature&quot;</span><span class="p">,</span>
<span class="nx">priority</span>: <span class="kt">5</span><span class="p">,</span>
<span class="nx">components</span><span class="o">:</span> <span class="p">{</span>
<span class="nx">View</span><span class="o">:</span> <span class="p">({</span> <span class="nx">entity</span> <span class="o">=</span> <span class="kc">null</span> <span class="p">}</span><span class="o">:</span> <span class="p">{</span> <span class="nx">entity</span>: <span class="kt">Common.Catalog.KubernetesCluster</span><span class="p">})</span> <span class="p">=&gt;</span> <span class="p">(</span>
<span class="o">&lt;</span><span class="nx">ExampleClusterFeatureSettings</span> <span class="nx">cluster</span><span class="o">=</span><span class="p">{</span><span class="nx">entity</span><span class="p">}</span> <span class="o">/&gt;</span>
<span class="p">)</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="p">];</span>
<span class="p">}</span>
</code></pre></div>
<p>An entity setting is added to the <code>entitySettings</code> array field of the <code>Renderer.LensExtension</code> class.
Because Lens's catalog can contain different kinds of entities, the kind must be identified.
For more details about the catalog see the <a href="../catalog/">Catalog Guide</a>.
Clusters are a built-in kind, so the <code>apiVersions</code> and <code>kind</code> fields should be set as above.
The <code>title</code> is shown as a navigation item on the cluster <strong>Settings</strong> page and the <code>components.View</code> is displayed when the navigation item is clicked on.
The <code>components.View</code> definition above shows how the <code>ExampleClusterFeatureSettings</code> element is included, and how its <code>cluster</code> prop is set.
<code>priority</code> determines the order of the entity settings, the higher the number the higher in the navigation panel the setting is placed. The default value is 50.</p>
<p>The final result looks like this:</p>
<p><img alt="Cluster Feature Settings" src="../images/clusterfeature.png" /></p>
<p><code>ExampleClusterFeature</code> and <code>ExampleClusterFeatureSettings</code> demonstrate a cluster feature for a simple resource stack.
In practice a resource stack can include many resources, and require more sophisticated life cycle management (upgrades, partial installations, etc.)
Using <code>Renderer.K8sApi.ResourceStack</code> and <code>entitySettings</code> it is possible to implement solutions for more complex cluster features.
The <strong>Lens Metrics</strong> setting (on the cluster <strong>Settings</strong> page) is a good example of an advanced solution.</p>
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