emit error for kube file not found (#11524)

* error  for kube file not found

* code cleanup

* pr feedback.

* make 'kube config' localized

extensions/resource-deployment/src/ui/modelViewUtils.ts

@@ -3,19 +3,20 @@
  *  Licensed under the Source EULA. See License.txt in the project root for license information.
  *--------------------------------------------------------------------------------------------*/
 import * as azdata from 'azdata';
+import * as fs from 'fs';
 import { EOL, homedir as os_homedir } from 'os';
 import * as path from 'path';
 import * as vscode from 'vscode';
 import * as nls from 'vscode-nls';
 import { azureResource } from '../../../azurecore/src/azureResource/azure-resource';
-import { AzureAccountFieldInfo, AzureLocationsFieldInfo, ComponentCSSStyles, DialogInfoBase, FieldInfo, FieldType, KubeClusterContextFieldInfo, LabelPosition, NoteBookEnvironmentVariablePrefix, OptionsInfo, OptionsType, PageInfoBase, RowInfo, SectionInfo, TextCSSStyles, FilePickerFieldInfo } from '../interfaces';
+import { AzureAccountFieldInfo, AzureLocationsFieldInfo, ComponentCSSStyles, DialogInfoBase, FieldInfo, FieldType, FilePickerFieldInfo, KubeClusterContextFieldInfo, LabelPosition, NoteBookEnvironmentVariablePrefix, OptionsInfo, OptionsType, PageInfoBase, RowInfo, SectionInfo, TextCSSStyles } from '../interfaces';
 import * as loc from '../localizedConstants';
+import { apiService } from '../services/apiService';
 import { getDefaultKubeConfigPath, getKubeConfigClusterContexts } from '../services/kubeService';
 import { assert, getDateTimeString, getErrorMessage } from '../utils';
 import { WizardInfoBase } from './../interfaces';
 import { Model } from './model';
 import { RadioGroupLoadingComponentBuilder } from './radioGroupLoadingComponentBuilder';
-import { apiService } from '../services/apiService';
 
 const localize = nls.loadMessageBundle();
 
@@ -658,6 +659,7 @@ function processFilePickerField(context: FieldContext): FilePickerInputs {
  */
 function getClusterContexts(file: string): (() => Promise<OptionsInfo>) {
 	return async () => {
+		await throwIfNotExistsOrNotAFile(file);
 		try {
 			let currentClusterContext = '';
 			const clusterContexts: string[] = (await getKubeConfigClusterContexts(file)).map(kubeClusterContext => {
@@ -677,6 +679,23 @@ function getClusterContexts(file: string): (() => Promise<OptionsInfo>) {
 	};
 }
 
+async function throwIfNotExistsOrNotAFile(file: string) {
+	try {
+		const stats = await fs.promises.stat(file); // this throws if the file does not exist with error.code = ENOENT
+		if (!stats.isFile()) {
+			throw Error(localize('fileChecker.NotFile', "Path: {0} is not a file, please select a valid kube config file.", file));
+		}
+	}
+	catch (e) {
+		if (e.code === 'ENOENT') {
+			throw Error(localize('fileChecker.FileNotFound', "File: {0} not found. Please select a kube config file.", file));
+		}
+		else {
+			throw e;
+		}
+	}
+}
+
 /**
  * A Kube Config Cluster picker field consists of a file system file picker and radio button selector for cluster contexts defined in the config filed picked using the file picker.
  * @param context The context to use to create the field

extensions/resource-deployment/src/ui/radioGroupLoadingComponentBuilder.ts

@@ -30,14 +30,15 @@ export class RadioGroupLoadingComponentBuilder implements azdata.ComponentBuilde
 	}
 
 	async loadOptions(optionsInfo: OptionsInfo | (() => Promise<OptionsInfo>)): Promise<void> {
-		if (typeof optionsInfo !== 'object') {
-			optionsInfo = await optionsInfo();
-		}
 		this.component().loading = true;
 		this._optionsDivContainer.clearItems();
-		let options: (string[] | azdata.CategoryValue[]) = optionsInfo.values!;
-		let defaultValue: string = optionsInfo.defaultValue!;
 		try {
+			if (typeof optionsInfo !== 'object') {
+				optionsInfo = await optionsInfo();
+			}
+
+			let options: (string[] | azdata.CategoryValue[]) = optionsInfo.values!;
+			let defaultValue: string = optionsInfo.defaultValue!;
 			options.forEach((op: string | azdata.CategoryValue) => {
 				const option: azdata.CategoryValue = (typeof op === 'string')
 					? { name: op, displayName: op }