feat(pipes-targets): add lambda function

packages/@aws-cdk/aws-pipes-targets-alpha/README.md

@@ -30,7 +30,8 @@ Pipe targets are the end point of a EventBridge Pipe.
 The following targets are supported:
 
 1. `targets.SqsTarget`: [Send event source to a Queue](#amazon-sqs)
-2. `targets.SfnStateMachine`: [Invoke a State Machine from an event source](#aws-step-functions)
+2. `targets.SfnStateMachine`: [Invoke a State Machine from an event source](#aws-step-functions-state-machine)
+3. `targets.LambdaFunction`: [Send event source to a Lambda Function](#aws-lambda-function)
 
 ### Amazon SQS
 
@@ -71,7 +72,7 @@ const pipe = new pipes.Pipe(this, 'Pipe', {
 
 ### AWS Step Functions State Machine
 
-A State Machine can be used as a target for a pipe. The State Machine will be invoked with the (enriched/filtered) source payload.
+A State Machine can be used as a target for a pipe. The State Machine will be invoked with the (enriched) source payload.
 
 ```ts
 declare const sourceQueue: sqs.Queue;
@@ -122,3 +123,51 @@ const pipe = new pipes.Pipe(this, 'Pipe', {
     target: pipeTarget
 });
 ```
+
+### AWS Lambda Function
+
+A Lambda Function can be used as a target for a pipe. The Lambda Function will be invoked with the (enriched) source payload.
+
+```ts
+declare const sourceQueue: sqs.Queue;
+declare const targetFunction: lambda.IFunction;
+
+const pipeTarget = new targets.LambdaFunction(targetFunction,{});
+
+const pipe = new pipes.Pipe(this, 'Pipe', {
+    source: new SomeSource(sourceQueue),
+    target: pipeTarget
+});
+```
+
+The target Lambda Function is invoked synchronously by default. You can also choose to invoke the Lambda Function asynchronously by setting `invocationType` property to `FIRE_AND_FORGET`.
+
+```ts
+declare const sourceQueue: sqs.Queue;
+declare const targetFunction: lambda.IFunction;
+
+const pipeTarget = new targets.LambdaFunction(targetFunction, {
+  invocationType: targets.LambdaFunctionInvocationType.FIRE_AND_FORGET,
+});
+
+const pipe = new pipes.Pipe(this, 'Pipe', {
+    source: new SomeSource(sourceQueue),
+    target: pipeTarget
+});
+```
+
+The input to the target Lambda Function can be transformed:
+
+```ts
+declare const sourceQueue: sqs.Queue;
+declare const targetFunction: lambda.IFunction;
+
+const pipeTarget = new targets.LambdaFunction(targetFunction, {
+  inputTransformation: pipes.InputTransformation.fromObject({ body: "👀" }),
+});
+
+const pipe = new pipes.Pipe(this, 'Pipe', {
+    source: new SomeSource(sourceQueue),
+    target: pipeTarget
+});
+```

packages/@aws-cdk/aws-pipes-targets-alpha/lib/index.ts

@@ -1,2 +1,3 @@
+export * from './lambda';
 export * from './sqs';
 export * from './stepfunctions';

packages/@aws-cdk/aws-pipes-targets-alpha/lib/lambda.ts

@@ -0,0 +1,79 @@
+import { IInputTransformation, IPipe, ITarget, TargetConfig } from '@aws-cdk/aws-pipes-alpha';
+import { IRole } from 'aws-cdk-lib/aws-iam';
+import * as lambda from 'aws-cdk-lib/aws-lambda';
+
+/**
+ * Parameters for the LambdaFunction target
+ */
+export interface LambdaFunctionParameters {
+
+  /**
+   * The input transformation to apply to the message before sending it to the target.
+   *
+   * @see https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-pipes-pipe-pipetargetparameters.html#cfn-pipes-pipe-pipetargetparameters-inputtemplate
+   * @default none
+   */
+  readonly inputTransformation?: IInputTransformation;
+
+  /**
+   * Specify whether to invoke the Lambda Function synchronously (`REQUEST_RESPONSE`) or asynchronously (`FIRE_AND_FORGET`).
+   *
+   * @see https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-pipes-pipe-pipetargetlambdafunctionparameters.html
+   * @default LambdaFunctionInvocationType.REQUEST_RESPONSE
+   */
+  readonly invocationType?: LambdaFunctionInvocationType;
+}
+
+/**
+ * InvocationType for invoking the Lambda Function.
+ * @see https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-pipes-pipe-pipetargetlambdafunctionparameters.html
+ */
+export enum LambdaFunctionInvocationType {
+  /**
+   * Invoke Lambda Function asynchronously (`Invoke`). `InvocationType` is set to `Event` on `Invoke`, see https://docs.aws.amazon.com/lambda/latest/api/API_Invoke.html for more details.
+   */
+  FIRE_AND_FORGET = 'FIRE_AND_FORGET',
+
+  /**
+   * Invoke Lambda Function synchronously (`Invoke`) and wait for the response. `InvocationType` is set to `RequestResponse` on `Invoke`, see https://docs.aws.amazon.com/lambda/latest/api/API_Invoke.html for more details.
+   */
+  REQUEST_RESPONSE = 'REQUEST_RESPONSE',
+}
+
+/**
+ * An EventBridge Pipes target that sends messages to an AWS Lambda Function.
+ */
+export class LambdaFunction implements ITarget {
+  public readonly targetArn: string;
+
+  private readonly lambdaFunction: lambda.IFunction;
+  private readonly invocationType: LambdaFunctionInvocationType;
+  private readonly inputTemplate?: IInputTransformation;
+
+  constructor(
+    lambdaFunction: lambda.IFunction,
+    parameters: LambdaFunctionParameters,
+  ) {
+    this.lambdaFunction = lambdaFunction;
+    this.targetArn = lambdaFunction.functionArn;
+    this.invocationType =
+      parameters.invocationType ??
+      LambdaFunctionInvocationType.REQUEST_RESPONSE;
+    this.inputTemplate = parameters.inputTransformation;
+  }
+
+  grantPush(grantee: IRole): void {
+    this.lambdaFunction.grantInvoke(grantee);
+  }
+
+  bind(pipe: IPipe): TargetConfig {
+    return {
+      targetParameters: {
+        inputTemplate: this.inputTemplate?.bind(pipe).inputTemplate,
+        lambdaFunctionParameters: {
+          invocationType: this.invocationType,
+        },
+      },
+    };
+  }
+}

packages/@aws-cdk/aws-pipes-targets-alpha/rosetta/default.ts-fixture

@@ -2,6 +2,7 @@
 import * as cdk from 'aws-cdk-lib';
 import * as sqs from 'aws-cdk-lib/aws-sqs';
 import * as sfn from 'aws-cdk-lib/aws-stepfunctions';
+import * as lambda from 'aws-cdk-lib/aws-lambda';
 import { Construct } from 'constructs';
 import * as pipes from '@aws-cdk/aws-pipes-alpha';
 import * as targets from '@aws-cdk/aws-pipes-targets-alpha';

packages/@aws-cdk/aws-pipes-targets-alpha/test/__snapshots__/lambda.test.ts.snap

@@ -0,0 +1,23 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`lambda-function should grant lambda function invoke 1`] = `
+{
+  "MyLambdaPipeRoleEF32F0E5": {
+    "Properties": {
+      "AssumeRolePolicyDocument": {
+        "Statement": [
+          {
+            "Action": "sts:AssumeRole",
+            "Effect": "Allow",
+            "Principal": {
+              "Service": "pipes.amazonaws.com",
+            },
+          },
+        ],
+        "Version": "2012-10-17",
+      },
+    },
+    "Type": "AWS::IAM::Role",
+  },
+}
+`;

packages/@aws-cdk/aws-pipes-targets-alpha/test/integ.lambda.handler/handler.ts

@@ -0,0 +1,14 @@
+// eslint-disable-next-line import/no-extraneous-dependencies
+import { LambdaClient, TagResourceCommand } from '@aws-sdk/client-lambda';
+
+exports.handler = async (event: any, context: any) => {
+  const client = new LambdaClient();
+  const input = {
+    Resource: context.invokedFunctionArn,
+    Tags: {
+      Identifier: event[0].body, // event is received in batches, we just take the first message to update the tag. See https://docs.aws.amazon.com/eventbridge/latest/userguide/pipes-targets-specifics.html
+    },
+  };
+  const command = new TagResourceCommand(input);
+  await client.send(command);
+};