mirror of
https://github.com/lensapp/lens.git
synced 2024-09-20 05:47:24 +03:00
cluster feature extension guide (#1527)
* added more sample extensions to overvew list, started clusterFeatures doc Signed-off-by: Jim Ehrismann <jehrismann@mirantis.com> * cluster-feature extension guide Signed-off-by: Jim Ehrismann <jehrismann@mirantis.com> * resolve merge conflict, plus address review comments, tweaks Signed-off-by: Jim Ehrismann <jehrismann@mirantis.com>
This commit is contained in:
parent
2a96e094bb
commit
238756be72
@ -14,6 +14,7 @@ Each guide or sample will include:
|
||||
|
||||
| Guide | APIs |
|
||||
| ----- | ----- |
|
||||
| [Generate new extension project](generator.md) ||
|
||||
| [Main process extension](main-extension.md) | LensMainExtension |
|
||||
| [Renderer process extension](renderer-extension.md) | LensRendererExtension |
|
||||
| [Stores](stores.md) | |
|
||||
@ -27,3 +28,7 @@ Each guide or sample will include:
|
||||
| ----- | ----- |
|
||||
[helloworld](https://github.com/lensapp/lens-extension-samples/tree/master/helloworld-sample) | LensMainExtension <br> LensRendererExtension <br> Component.Icon <br> Component.IconProps |
|
||||
[minikube](https://github.com/lensapp/lens-extension-samples/tree/master/minikube-sample) | LensMainExtension <br> Store.clusterStore <br> Store.workspaceStore |
|
||||
[styling-css-modules-sample](https://github.com/lensapp/lens-extension-samples/tree/master/styling-css-modules-sample) | LensMainExtension <br> LensRendererExtension <br> Component.Icon <br> Component.IconProps |
|
||||
[styling-emotion-sample](https://github.com/lensapp/lens-extension-samples/tree/master/styling-emotion-sample) | LensMainExtension <br> LensRendererExtension <br> Component.Icon <br> Component.IconProps |
|
||||
[styling-sass-sample](https://github.com/lensapp/lens-extension-samples/tree/master/styling-sass-sample) | LensMainExtension <br> LensRendererExtension <br> Component.Icon <br> Component.IconProps |
|
||||
[custom-resource-page](https://github.com/lensapp/lens-extension-samples/tree/master/custom-resource-page) | LensRendererExtension <br> K8sApi.KubeApi <br> K8sApi.KubeObjectStore <br> Component.KubeObjectListLayout <br> Component.KubeObjectDetailsProps <br> Component.IconProps |
|
||||
|
@ -269,7 +269,115 @@ export class HelpPage extends React.Component<{ extension: LensRendererExtension
|
||||
|
||||
`HelpIcon` introduces one of Lens' built-in components available to extension developers, the `Component.Icon`. Built in are the [Material Design](https://material.io) [icons](https://material.io/resources/icons/). One can be selected by name via the `material` field.
|
||||
|
||||
### `clusterFeatures`
|
||||
|
||||
Cluster features are Kubernetes resources that can be applied to and managed within the active cluster. They can be installed/uninstalled by the Lens user from the [cluster settings page]().
|
||||
The following example shows how to add a cluster feature as part of a `LensRendererExtension`:
|
||||
|
||||
``` typescript
|
||||
import { LensRendererExtension } from "@k8slens/extensions"
|
||||
import { ExampleFeature } from "./src/example-feature"
|
||||
import React from "react"
|
||||
|
||||
export default class ExampleFeatureExtension extends LensRendererExtension {
|
||||
clusterFeatures = [
|
||||
{
|
||||
title: "Example Feature",
|
||||
components: {
|
||||
Description: () => {
|
||||
return (
|
||||
<span>
|
||||
Enable an example feature.
|
||||
</span>
|
||||
)
|
||||
}
|
||||
},
|
||||
feature: new ExampleFeature()
|
||||
}
|
||||
];
|
||||
}
|
||||
```
|
||||
The `title` and `components.Description` fields provide content that appears on the cluster settings page, in the **Features** section. The `feature` field must specify an instance which extends the abstract class `ClusterFeature.Feature`, and specifically implement the following methods:
|
||||
|
||||
``` typescript
|
||||
abstract install(cluster: Cluster): Promise<void>;
|
||||
abstract upgrade(cluster: Cluster): Promise<void>;
|
||||
abstract uninstall(cluster: Cluster): Promise<void>;
|
||||
abstract updateStatus(cluster: Cluster): Promise<ClusterFeatureStatus>;
|
||||
```
|
||||
|
||||
The `install()` method is typically called by Lens when a user has indicated that this feature is to be installed (i.e. clicked **Install** for the feature on the cluster settings page). The implementation of this method should install kubernetes resources using the `applyResources()` method, or by directly accessing the kubernetes api ([`K8sApi`](tbd)).
|
||||
|
||||
The `upgrade()` method is typically called by Lens when a user has indicated that this feature is to be upgraded (i.e. clicked **Upgrade** for the feature on the cluster settings page). The implementation of this method should upgrade the kubernetes resources already installed, if relevant to the feature.
|
||||
|
||||
The `uninstall()` method is typically called by Lens when a user has indicated that this feature is to be uninstalled (i.e. clicked **Uninstall** for the feature on the cluster settings page). The implementation of this method should uninstall kubernetes resources using the kubernetes api (`K8sApi`)
|
||||
|
||||
The `updateStatus()` method is called periodically by Lens to determine details about the feature's current status. The implementation of this method should provide the current status information in the `status` field of the `ClusterFeature.Feature` parent class. The `status.currentVersion` and `status.latestVersion` fields may be displayed by Lens in describing the feature. The `status.installed` field should be set to true if the feature is currently installed, otherwise false. Also, Lens relies on the `status.canUpgrade` field to determine if the feature can be upgraded (i.e a new version could be available) so the implementation should set the `status.canUpgrade` field according to specific rules for the feature, if relevant.
|
||||
|
||||
The following shows a very simple implementation of a `ClusterFeature`:
|
||||
|
||||
``` typescript
|
||||
import { ClusterFeature, Store, K8sApi } from "@k8slens/extensions";
|
||||
import * as path from "path";
|
||||
|
||||
export class ExampleFeature extends ClusterFeature.Feature {
|
||||
|
||||
async install(cluster: Store.Cluster): Promise<void> {
|
||||
|
||||
super.applyResources(cluster, path.join(__dirname, "../resources/"));
|
||||
}
|
||||
|
||||
async upgrade(cluster: Store.Cluster): Promise<void> {
|
||||
return this.install(cluster);
|
||||
}
|
||||
|
||||
async updateStatus(cluster: Store.Cluster): Promise<ClusterFeature.FeatureStatus> {
|
||||
try {
|
||||
const pod = K8sApi.forCluster(cluster, K8sApi.Pod);
|
||||
const examplePod = await pod.get({name: "example-pod", namespace: "default"});
|
||||
if (examplePod?.kind) {
|
||||
this.status.installed = true;
|
||||
this.status.currentVersion = examplePod.spec.containers[0].image.split(":")[1];
|
||||
this.status.canUpgrade = true; // a real implementation would perform a check here that is relevant to the specific feature
|
||||
} else {
|
||||
this.status.installed = false;
|
||||
this.status.canUpgrade = false;
|
||||
}
|
||||
} catch(e) {
|
||||
if (e?.error?.code === 404) {
|
||||
this.status.installed = false;
|
||||
this.status.canUpgrade = false;
|
||||
}
|
||||
}
|
||||
|
||||
return this.status;
|
||||
}
|
||||
|
||||
async uninstall(cluster: Store.Cluster): Promise<void> {
|
||||
const podApi = K8sApi.forCluster(cluster, K8sApi.Pod);
|
||||
await podApi.delete({name: "example-pod", namespace: "default"});
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
This example implements the `install()` method by simply invoking the helper `applyResources()` method. `applyResources()` tries to apply all resources read from all files found in the folder path provided. In this case this folder path is the `../resources` subfolder relative to current source code's folder. The file `../resources/example-pod.yml` could contain:
|
||||
|
||||
``` yaml
|
||||
apiVersion: v1
|
||||
kind: Pod
|
||||
metadata:
|
||||
name: example-pod
|
||||
spec:
|
||||
containers:
|
||||
- name: example-pod
|
||||
image: nginx
|
||||
```
|
||||
|
||||
The `upgrade()` method in the example above is implemented by simply invoking the `install()` method. Depending on the feature to be supported by an extension, upgrading may require additional and/or different steps.
|
||||
|
||||
The `uninstall()` method is implemented in the example above by utilizing the [`K8sApi`](tbd) provided by Lens to simply delete the `example-pod` pod applied by the `install()` method.
|
||||
|
||||
The `updateStatus()` method is implemented above by using the [`K8sApi`](tbd) as well, this time to get information from the `example-pod` pod, in particular to determine if it is installed, what version is associated with it, and if it can be upgraded. How the status is updated for a specific cluster feature is up to the implementation.
|
||||
|
||||
|
||||
*********************************************************************
|
||||
@ -278,44 +386,6 @@ WIP below!
|
||||
|
||||
|
||||
|
||||
### `clusterFeatures`
|
||||
|
||||
Cluster features are Kubernetes resources that can applied and managed to the active cluster. They can be installed/uninstalled from the [cluster settings page]().
|
||||
The following example shows how to add a cluster feature:
|
||||
|
||||
``` typescript
|
||||
import { LensRendererExtension } from "@k8slens/extensions"
|
||||
import { MetricsFeature } from "./src/metrics-feature"
|
||||
import React from "react"
|
||||
|
||||
export default class ClusterMetricsFeatureExtension extends LensRendererExtension {
|
||||
clusterFeatures = [
|
||||
{
|
||||
title: "Metrics Stack",
|
||||
components: {
|
||||
Description: () => {
|
||||
return (
|
||||
<span>
|
||||
Enable timeseries data visualization (Prometheus stack) for your cluster.
|
||||
Install this only if you don't have existing Prometheus stack installed.
|
||||
You can see preview of manifests <a href="https://github.com/lensapp/lens/tree/master/extensions/lens-metrics/resources" target="_blank">here</a>.
|
||||
</span>
|
||||
)
|
||||
}
|
||||
},
|
||||
feature: new MetricsFeature()
|
||||
}
|
||||
];
|
||||
}
|
||||
```
|
||||
The `title` and `components.Description` fields appear on the cluster settings page. The cluster feature must extend the abstract class `ClusterFeature.Feature`, and specifically implement the following methods:
|
||||
|
||||
``` typescript
|
||||
abstract install(cluster: Cluster): Promise<void>;
|
||||
abstract upgrade(cluster: Cluster): Promise<void>;
|
||||
abstract uninstall(cluster: Cluster): Promise<void>;
|
||||
abstract updateStatus(cluster: Cluster): Promise<ClusterFeatureStatus>;
|
||||
```
|
||||
|
||||
### `appPreferences`
|
||||
|
||||
|
@ -47,7 +47,7 @@ export abstract class ClusterFeature {
|
||||
abstract async install(cluster: Cluster): Promise<void>;
|
||||
|
||||
/**
|
||||
* to be implemented in the derived class, this method is typically called by Lens when a user has indicated that this feature is to be ugraded. The implementation
|
||||
* to be implemented in the derived class, this method is typically called by Lens when a user has indicated that this feature is to be upgraded. The implementation
|
||||
* of this method should upgrade the kubernetes resources already installed, if relevant to the feature
|
||||
*
|
||||
* @param cluster the cluster that the feature is to be upgraded on
|
||||
@ -56,7 +56,7 @@ export abstract class ClusterFeature {
|
||||
|
||||
/**
|
||||
* to be implemented in the derived class, this method is typically called by Lens when a user has indicated that this feature is to be uninstalled. The implementation
|
||||
* of this method should install kubernetes resources using the kubernetes api (K8sApi)
|
||||
* of this method should uninstall kubernetes resources using the kubernetes api (K8sApi)
|
||||
*
|
||||
* @param cluster the cluster that the feature is to be uninstalled from
|
||||
*/
|
||||
|
Loading…
Reference in New Issue
Block a user