chore(release): 1.42.1 (aws#8302)

See CHANGELOG.md

----

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

CHANGELOG.md

@@ -2,6 +2,13 @@
 
 All notable changes to this project will be documented in this file. See [standard-version](https://github.com/conventional-changelog/standard-version) for commit guidelines.
 
+## [1.42.1](https://github.com/aws/aws-cdk/compare/v1.42.0...v1.42.1) (2020-06-01)
+
+
+### Bug Fixes
+
+* **lambda:** `SingletonFunction.grantInvoke()` API fails with error 'No child with id' ([#8296](https://github.com/aws/aws-cdk/issues/8296)) ([b4e264c](https://github.com/aws/aws-cdk/commit/b4e264c024bc58053412be1343bed6458628f7cb)), closes [#8240](https://github.com/aws/aws-cdk/issues/8240)
+
 ## [1.42.0](https://github.com/aws/aws-cdk/compare/v1.41.0...v1.42.0) (2020-05-27)
 
 

lerna.json

@@ -10,5 +10,5 @@
     "tools/*"
   ],
   "rejectCycles": "true",
-  "version": "1.42.0"
+  "version": "1.42.1"
 }

packages/@aws-cdk/aws-lambda/lib/function-base.ts

@@ -284,7 +284,7 @@ export abstract class FunctionBase extends Resource implements IFunction {
             action: 'lambda:InvokeFunction',
           });
 
-          return { statementAdded: true, policyDependable: this.node.findChild(identifier) } as iam.AddToResourcePolicyResult;
+          return { statementAdded: true, policyDependable: this._functionNode().findChild(identifier) } as iam.AddToResourcePolicyResult;
         },
         node: this.node,
       },
@@ -318,6 +318,15 @@ export abstract class FunctionBase extends Resource implements IFunction {
     });
   }
 
+  /**
+   * Returns the construct tree node that corresponds to the lambda function.
+   * For use internally for constructs, when the tree is set up in non-standard ways. Ex: SingletonFunction.
+   * @internal
+   */
+  protected _functionNode(): ConstructNode {
+    return this.node;
+  }
+
   private parsePermissionPrincipal(principal?: iam.IPrincipal) {
     if (!principal) {
       return undefined;

packages/@aws-cdk/aws-lambda/lib/singleton-lambda.ts

@@ -81,6 +81,14 @@ export class SingletonFunction extends FunctionBase {
     down.node.addDependency(this.lambdaFunction);
   }
 
+  /**
+   * Returns the construct tree node that corresponds to the lambda function.
+   * @internal
+   */
+  protected _functionNode(): cdk.ConstructNode {
+    return this.lambdaFunction.node;
+  }
+
   private ensureLambda(props: SingletonFunctionProps): IFunction {
     const constructName = (props.lambdaPurpose || 'SingletonLambda') + slugify(props.uuid);
     const existing = cdk.Stack.of(this).node.tryFindChild(constructName);

packages/@aws-cdk/aws-lambda/test/test.singleton-lambda.ts

@@ -113,4 +113,32 @@ export = {
 
     test.done();
   },
+
+  'grantInvoke works correctly'(test: Test) {
+    // GIVEN
+    const stack = new cdk.Stack();
+    const singleton = new lambda.SingletonFunction(stack, 'Singleton', {
+      uuid: '84c0de93-353f-4217-9b0b-45b6c993251a',
+      code: new lambda.InlineCode('def hello(): pass'),
+      runtime: lambda.Runtime.PYTHON_2_7,
+      handler: 'index.hello',
+    });
+
+    // WHEN
+    const invokeResult = singleton.grantInvoke(new iam.ServicePrincipal('events.amazonaws.com'));
+    const statement = stack.resolve(invokeResult.resourceStatement);
+
+    // THEN
+    expect(stack).to(haveResource('AWS::Lambda::Permission', {
+      Action: 'lambda:InvokeFunction',
+      Principal: 'events.amazonaws.com',
+    }));
+    test.deepEqual(statement.action, [ 'lambda:InvokeFunction' ]);
+    test.deepEqual(statement.principal, { Service: [ 'events.amazonaws.com' ] });
+    test.deepEqual(statement.effect, 'Allow');
+    test.deepEqual(statement.resource, [{
+      'Fn::GetAtt': [ 'SingletonLambda84c0de93353f42179b0b45b6c993251a840BCC38', 'Arn' ],
+    }]);
+    test.done();
+  },
 };