refactor(toolkit): resource metadata (#243)

Pulls out resource-metadata extraction into a separate API so it can
easily be reused in other places.
Also adds support for resource metadata to
`EvaluateCloudFormationTemplate` (internal API) in preparation for a
change in hotswap.

---
By submitting this pull request, I confirm that my contribution is made
under the terms of the Apache-2.0 license

Author: mrgrain

.projenrc.ts

@@ -655,6 +655,7 @@ const tmpToolkitHelpers = configureProject(
       'fast-check',
     ],
     deps: [
+      cloudAssemblySchema.name,
       'archiver',
       'glob',
       'semver',

packages/@aws-cdk/tmp-toolkit-helpers/.projen/deps.json

@@ -1,7 +1,7 @@
-import type { MetadataEntry } from '@aws-cdk/cloud-assembly-schema';
 import type { CloudFormationStackArtifact } from '@aws-cdk/cx-api';
 import type { StackEvent } from '@aws-sdk/client-cloudformation';
 import type { StackProgress } from './progress';
+import type { ResourceMetadata } from '../../resource-metadata/resource-metadata';
 
 /**
  * Payload when stack monitoring is starting or stopping for a given stack deployment.
@@ -48,6 +48,9 @@ export interface StackActivity {
 
   /**
    * Additional resource metadata
+   *
+   * This information is only available if the information is available in the current cloud assembly.
+   * I.e. no `metadata` will not be available for resource deletion events.
    */
   readonly metadata?: ResourceMetadata;
 
@@ -56,8 +59,3 @@ export interface StackActivity {
    */
   readonly progress: StackProgress;
 }
-
-export interface ResourceMetadata {
-  entry: MetadataEntry;
-  constructPath: string;
-}

packages/@aws-cdk/tmp-toolkit-helpers/.projen/tasks.json

@@ -21,7 +21,7 @@ import type { FileWatchEvent, WatchSettings } from '../payloads/watch';
  * - X900-X999 are reserved for results
  */
 export const IO = {
-  // Defaults
+  // Defaults (0000)
   DEFAULT_TOOLKIT_INFO: make.info({
     code: 'CDK_TOOLKIT_I0000',
     description: 'Default info messages emitted from the Toolkit',
@@ -35,7 +35,7 @@ export const IO = {
     description: 'Default warning messages emitted from the Toolkit',
   }),
 
-  // 1: Synth
+  // 1: Synth (1xxx)
   CDK_TOOLKIT_I1000: make.info<Duration>({
     code: 'CDK_TOOLKIT_I1000',
     description: 'Provides synthesis times.',
@@ -57,7 +57,7 @@ export const IO = {
     interface: 'AssemblyData',
   }),
 
-  // 2: List
+  // 2: List (2xxx)
   CDK_TOOLKIT_I2901: make.result<StackDetailsPayload>({
     code: 'CDK_TOOLKIT_I2901',
     description: 'Provides details on the selected stacks and their dependencies',
@@ -70,9 +70,9 @@ export const IO = {
     description: 'Resource import failed',
   }),
 
-  // 4: Diff
+  // 4: Diff (4xxx)
 
-  // 5: Deploy & Watch
+  // 5: Deploy & Watch (5xxx)
   CDK_TOOLKIT_I5000: make.info<Duration>({
     code: 'CDK_TOOLKIT_I5000',
     description: 'Provides deployment times',
@@ -129,14 +129,13 @@ export const IO = {
     description: 'Confirm deploy security sensitive changes',
     interface: 'DeployConfirmationRequest',
   }),
-
   CDK_TOOLKIT_I5100: make.info<StackDeployProgress>({
     code: 'CDK_TOOLKIT_I5100',
     description: 'Stack deploy progress',
     interface: 'StackDeployProgress',
   }),
 
-  // Assets
+  // Assets (52xx)
   CDK_TOOLKIT_I5210: make.trace<BuildAsset>({
     code: 'CDK_TOOLKIT_I5210',
     description: 'Started building a specific asset',
@@ -147,7 +146,6 @@ export const IO = {
     description: 'Building the asset has completed',
     interface: 'Duration',
   }),
-
   CDK_TOOLKIT_I5220: make.trace<PublishAsset>({
     code: 'CDK_TOOLKIT_I5220',
     description: 'Started publishing a specific asset',
@@ -159,7 +157,7 @@ export const IO = {
     interface: 'Duration',
   }),
 
-  // Watch
+  // Watch (53xx)
   CDK_TOOLKIT_I5310: make.debug<WatchSettings>({
     code: 'CDK_TOOLKIT_I5310',
     description: 'The computed settings used for file watching',
@@ -189,7 +187,9 @@ export const IO = {
     description: 'Queued watch deployment started',
   }),
 
-  // Stack Monitor
+  // Hotswap (54xx)
+
+  // Stack Monitor (55xx)
   CDK_TOOLKIT_I5501: make.info<StackMonitoringControlEvent>({
     code: 'CDK_TOOLKIT_I5501',
     description: 'Stack Monitoring: Start monitoring of a single stack',
@@ -206,7 +206,7 @@ export const IO = {
     interface: 'StackMonitoringControlEvent',
   }),
 
-  // Success
+  // Success (59xx)
   CDK_TOOLKIT_I5900: make.result<SuccessfulDeployStackResult>({
     code: 'CDK_TOOLKIT_I5900',
     description: 'Deployment results on success',
@@ -232,7 +232,7 @@ export const IO = {
     interface: 'ErrorPayload',
   }),
 
-  // 6: Rollback
+  // 6: Rollback (6xxx)
   CDK_TOOLKIT_I6000: make.info<Duration>({
     code: 'CDK_TOOLKIT_I6000',
     description: 'Provides rollback times',
@@ -254,7 +254,7 @@ export const IO = {
     interface: 'ErrorPayload',
   }),
 
-  // 7: Destroy
+  // 7: Destroy (7xxx)
   CDK_TOOLKIT_I7000: make.info<Duration>({
     code: 'CDK_TOOLKIT_I7000',
     description: 'Provides destroy times',
@@ -297,7 +297,7 @@ export const IO = {
     interface: 'ErrorPayload',
   }),
 
-  // 9: Bootstrap
+  // 9: Bootstrap (9xxx)
   CDK_TOOLKIT_I9000: make.info<Duration>({
     code: 'CDK_TOOLKIT_I9000',
     description: 'Provides bootstrap times',

packages/@aws-cdk/tmp-toolkit-helpers/package.json

@@ -0,0 +1,57 @@
+import { ArtifactMetadataEntryType, type MetadataEntry } from '@aws-cdk/cloud-assembly-schema';
+import type { CloudFormationStackArtifact } from '@aws-cdk/cx-api';
+
+/**
+ * Metadata entry for a resource within a CloudFormation stack
+ */
+export interface ResourceMetadata {
+  /**
+   * The resource's metadata as declared in the cloud assembly
+   */
+  readonly entry: MetadataEntry;
+  /**
+   * The construct path of the resource
+   */
+  readonly constructPath: string;
+}
+
+/**
+ * Attempts to read metadata for resources from a CloudFormation stack artifact
+ *
+ * @param stack The CloudFormation stack to read from
+ * @param logicalId The logical ID of the resource to read
+ *
+ * @returns The resource metadata, or undefined if the resource was not found
+ */
+export function resourceMetadata(stack: CloudFormationStackArtifact, logicalId: string): ResourceMetadata | undefined {
+  const metadata = stack.manifest?.metadata;
+  if (!metadata) {
+    return undefined;
+  }
+
+  for (const path of Object.keys(metadata)) {
+    const entry = metadata[path]
+      .filter((e) => e.type === ArtifactMetadataEntryType.LOGICAL_ID)
+      .find((e) => e.data === logicalId);
+    if (entry) {
+      return {
+        entry,
+        constructPath: simplifyConstructPath(path, stack.stackName),
+      };
+    }
+  }
+  return undefined;
+}
+
+function simplifyConstructPath(path: string, stackName: string) {
+  path = path.replace(/\/Resource$/, '');
+  path = path.replace(/^\//, ''); // remove "/" prefix
+
+  // remove "<stack-name>/" prefix
+  if (stackName) {
+    if (path.startsWith(stackName + '/')) {
+      path = path.slice(stackName.length + 1);
+    }
+  }
+  return path;
+}

packages/@aws-cdk/tmp-toolkit-helpers/src/api/io/payloads/stack-activity.ts

@@ -103,8 +103,7 @@ export async function tryHotswapDeployment(
   const currentTemplate = await loadCurrentTemplateWithNestedStacks(stackArtifact, sdk);
 
   const evaluateCfnTemplate = new EvaluateCloudFormationTemplate({
-    stackName: stackArtifact.stackName,
-    template: stackArtifact.template,
+    stackArtifact,
     parameters: assetParams,
     account: resolvedEnv.account,
     region: resolvedEnv.region,

packages/@aws-cdk/tmp-toolkit-helpers/src/api/io/private/messages.ts

@@ -1,6 +1,9 @@
+import type { CloudFormationStackArtifact } from '@aws-cdk/cx-api';
 import type { Export, ListExportsCommandOutput, StackResourceSummary } from '@aws-sdk/client-cloudformation';
 import type { SDK } from './aws-auth';
 import type { NestedStackTemplates } from './deployments';
+import { resourceMetadata } from '../../../@aws-cdk/tmp-toolkit-helpers/src/api/resource-metadata/resource-metadata';
+import type { ResourceMetadata } from '../../../@aws-cdk/tmp-toolkit-helpers/src/api/resource-metadata/resource-metadata';
 import { ToolkitError } from '../toolkit/error';
 
 export interface ListStackResources {
@@ -85,8 +88,9 @@ export interface ResourceDefinition {
 }
 
 export interface EvaluateCloudFormationTemplateProps {
-  readonly stackName: string;
-  readonly template: Template;
+  readonly stackArtifact: CloudFormationStackArtifact;
+  readonly stackName?: string;
+  readonly template?: Template;
   readonly parameters: { [parameterName: string]: string };
   readonly account: string;
   readonly region: string;
@@ -98,6 +102,7 @@ export interface EvaluateCloudFormationTemplateProps {
 }
 
 export class EvaluateCloudFormationTemplate {
+  public readonly stackArtifact: CloudFormationStackArtifact;
   private readonly stackName: string;
   private readonly template: Template;
   private readonly context: { [k: string]: any };
@@ -114,8 +119,9 @@ export class EvaluateCloudFormationTemplate {
   private cachedUrlSuffix: string | undefined;
 
   constructor(props: EvaluateCloudFormationTemplateProps) {
-    this.stackName = props.stackName;
-    this.template = props.template;
+    this.stackArtifact = props.stackArtifact;
+    this.stackName = props.stackName ?? props.stackArtifact.stackName;
+    this.template = props.template ?? props.stackArtifact.template;
     this.context = {
       'AWS::AccountId': props.account,
       'AWS::Region': props.region,
@@ -147,6 +153,7 @@ export class EvaluateCloudFormationTemplate {
   ) {
     const evaluatedParams = await this.evaluateCfnExpression(nestedStackParameters);
     return new EvaluateCloudFormationTemplate({
+      stackArtifact: this.stackArtifact,
       stackName,
       template: nestedTemplate,
       parameters: evaluatedParams,
@@ -312,6 +319,10 @@ export class EvaluateCloudFormationTemplate {
     return this.template.Resources?.[logicalId]?.Properties?.[propertyName];
   }
 
+  public metadataFor(logicalId: string): ResourceMetadata | undefined {
+    return resourceMetadata(this.stackArtifact, logicalId);
+  }
+
   private references(logicalId: string, templateElement: any): boolean {
     if (typeof templateElement === 'string') {
       return logicalId === templateElement;

packages/@aws-cdk/tmp-toolkit-helpers/src/api/resource-metadata/resource-metadata.ts

@@ -53,8 +53,7 @@ export async function findCloudWatchLogGroups(
 
   const listStackResources = new LazyListStackResources(sdk, stackArtifact.stackName);
   const evaluateCfnTemplate = new EvaluateCloudFormationTemplate({
-    stackName: stackArtifact.stackName,
-    template: stackArtifact.template,
+    stackArtifact,
     parameters: {},
     account: resolvedEnv.account,
     region: resolvedEnv.region,