util: add guessDefaultRegion (#2718)

## Problem
Currently, there is not a strong default for what region the user is working with. Internally, it can be difficult to know what region to have defaulted in Wizards or other selections.

## Solution
We can solve this by implementing a heuristic `guessDefaultRegion` function that tracks what regions the user is working with in the explorer and makes a guess on what region the user wants to continue to work with.

Author: Hweinstock

src/apigateway/explorer/apiGatewayNodes.ts

@@ -23,7 +23,7 @@ import globals from '../../shared/extensionGlobals'
 export class ApiGatewayNode extends AWSTreeNodeBase {
     private readonly apiNodes: Map<string, RestApiNode>
 
-    public constructor(private readonly partitionId: string, private readonly regionCode: string) {
+    public constructor(private readonly partitionId: string, public readonly regionCode: string) {
         super('API Gateway', vscode.TreeItemCollapsibleState.Collapsed)
         this.apiNodes = new Map<string, RestApiNode>()
     }

src/apprunner/commands/createService.ts

@@ -12,7 +12,7 @@ export async function createAppRunnerService(node: AppRunnerNode): Promise<void>
     let source: telemetry.AppRunnerServiceSource | undefined = undefined
 
     try {
-        const wizard = new CreateAppRunnerServiceWizard(node.region)
+        const wizard = new CreateAppRunnerServiceWizard(node.regionCode)
         const result = await wizard.run()
         if (result === undefined) {
             telemetryResult = 'Cancelled'

src/apprunner/explorer/apprunnerNode.ts

@@ -21,7 +21,7 @@ export class AppRunnerNode extends AWSTreeNodeBase {
     private readonly pollingNodes: Set<string> = new Set()
     private pollTimer?: NodeJS.Timeout
 
-    public constructor(public readonly region: string, public readonly client: AppRunnerClient) {
+    public constructor(public readonly regionCode: string, public readonly client: AppRunnerClient) {
         super('App Runner', vscode.TreeItemCollapsibleState.Collapsed)
         this.contextValue = 'awsAppRunnerNode'
     }

src/apprunner/explorer/apprunnerServiceNode.ts

@@ -45,7 +45,7 @@ export class AppRunnerServiceNode extends CloudWatchLogsBase implements AWSResou
     ) {
         super(
             'App Runner Service',
-            parent.region,
+            parent.regionCode,
             localize('AWS.explorerNode.apprunner.nologs', '[No App Runner logs found]')
         )
         this.iconPath = getIcon('aws-apprunner-service')

src/awsexplorer/awsExplorer.ts

@@ -81,6 +81,10 @@ export class AwsExplorer implements vscode.TreeDataProvider<AWSTreeNodeBase>, Re
     }
 
     public async getChildren(element?: AWSTreeNodeBase): Promise<AWSTreeNodeBase[]> {
+        if (element) {
+            this.awsContext.setLastTouchedRegion(element.regionCode)
+        }
+
         let childNodes: AWSTreeNodeBase[] = []
 
         try {

src/awsexplorer/regionNode.ts

@@ -33,10 +33,8 @@ import globals from '../shared/extensionGlobals'
 export class RegionNode extends AWSTreeNodeBase {
     private region: Region
     private readonly childNodes: AWSTreeNodeBase[] = []
+    public readonly regionCode: string
 
-    public get regionCode(): string {
-        return this.region.id
-    }
     public get regionName(): string {
         return this.region.name
     }
@@ -45,6 +43,7 @@ export class RegionNode extends AWSTreeNodeBase {
         super(region.name, TreeItemCollapsibleState.Expanded)
         this.contextValue = 'awsRegionNode'
         this.region = region
+        this.regionCode = region.id
         this.update(region)
 
         //  Services that are candidates to add to the region explorer.

src/cloudWatchLogs/explorer/cloudWatchLogsNode.ts

@@ -23,7 +23,7 @@ export abstract class CloudWatchLogsBase extends AWSTreeNodeBase {
 
     public constructor(
         label: string,
-        protected readonly regionCode: string,
+        public readonly regionCode: string,
         protected placeholderMessage: string = localize(
             'AWS.explorerNode.cloudWatchLogs.nologs',
             '[No log groups found]'

src/eventSchemas/explorer/registryItemNode.ts

@@ -22,6 +22,7 @@ import { SchemaClient } from '../../shared/clients/schemaClient'
 
 export class RegistryItemNode extends AWSTreeNodeBase {
     private readonly schemaNodes: Map<string, SchemaItemNode>
+    public readonly regionCode: string = this.client.regionCode
 
     public constructor(private registryItemOutput: Schemas.RegistrySummary, private readonly client: SchemaClient) {
         super('', vscode.TreeItemCollapsibleState.Collapsed)
@@ -32,10 +33,6 @@ export class RegistryItemNode extends AWSTreeNodeBase {
         this.iconPath = getIcon('aws-schemas-registry')
     }
 
-    public get regionCode() {
-        return this.client.regionCode
-    }
-
     public get registryName(): string {
         return (
             this.registryItemOutput.RegistryName ||

src/eventSchemas/explorer/schemasNode.ts

@@ -18,17 +18,14 @@ import { SchemaClient } from '../../shared/clients/schemaClient'
 
 export class SchemasNode extends AWSTreeNodeBase {
     private readonly registryNodes: Map<string, RegistryItemNode>
+    public readonly regionCode = this.client.regionCode
 
     public constructor(private readonly client: SchemaClient) {
         super('Schemas', vscode.TreeItemCollapsibleState.Collapsed)
         this.registryNodes = new Map<string, RegistryItemNode>()
         this.contextValue = 'awsSchemasNode'
     }
 
-    public get regionCode() {
-        return this.client.regionCode
-    }
-
     public async getChildren(): Promise<AWSTreeNodeBase[]> {
         return await makeChildrenNodes({
             getChildNodes: async () => {

src/integrationTest/index.ts

@@ -3,8 +3,8 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-import { runTestsInFolder } from '../test/testRunner'
+import { runTests } from '../test/testRunner'
 
 export function run(): Promise<void> {
-    return runTestsInFolder('src/integrationTest', ['src/integrationTest/globalSetup.test.ts'])
+    return runTests('src/integrationTest', ['src/integrationTest/globalSetup.test.ts'])
 }