Classes for adding kube config and kube cluster picker to Controller connection dialog (#13479)

extensions/arc/src/common/kubeUtils.ts

@@ -0,0 +1,39 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import * as os from 'os';
+import * as path from 'path';
+import * as yamljs from 'yamljs';
+import * as loc from '../localizedConstants';
+import { throwUnless } from './utils';
+export interface KubeClusterContext {
+	name: string;
+	isCurrentContext: boolean;
+}
+
+export function getKubeConfigClusterContexts(configFile: string): Promise<KubeClusterContext[]> {
+	const config: any = yamljs.load(configFile);
+	const rawContexts = <any[]>config['contexts'];
+	throwUnless(rawContexts && rawContexts.length, loc.noContextFound(configFile));
+	const currentContext = <string>config['current-context'];
+	throwUnless(currentContext, loc.noCurrentContextFound(configFile));
+	const contexts: KubeClusterContext[] = [];
+	rawContexts.forEach(rawContext => {
+		const name = <string>rawContext['name'];
+		throwUnless(name, loc.noNameInContext(configFile));
+		if (name) {
+			contexts.push({
+				name: name,
+				isCurrentContext: name === currentContext
+			});
+		}
+	});
+	return Promise.resolve(contexts);
+}
+
+export function getDefaultKubeConfigPath(): string {
+	return path.join(os.homedir(), '.kube', 'config');
+}
+

extensions/arc/src/common/utils.ts

@@ -67,7 +67,7 @@ export function getResourceTypeIcon(resourceType: string | undefined): IconPath
 
 /**
  * Returns the text to display for known connection modes
- * @param connectionMode The string repsenting the connection mode
+ * @param connectionMode The string representing the connection mode
  */
 export function getConnectionModeDisplayText(connectionMode: string | undefined): string {
 	connectionMode = connectionMode ?? '';
@@ -282,8 +282,18 @@ export function convertToGibibyteString(value: string): string {
  * @param condition
  * @param message
  */
-export function throwUnless(condition: boolean, message?: string): asserts condition {
+export function throwUnless(condition: any, message?: string): asserts condition {
 	if (!condition) {
 		throw new Error(message);
 	}
 }
+
+export async function tryExecuteAction<T>(action: () => T | PromiseLike<T>): Promise<{ result: T | undefined, error: any }> {
+	let error: any, result: T | undefined;
+	try {
+		result = await action();
+	} catch (e) {
+		error = e;
+	}
+	return { result, error };
+}