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@aws-cdk/aws-events-targets

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Readme

Event Targets for Amazon EventBridge

This library contains integration classes to send Amazon EventBridge to any number of supported AWS Services. Instances of these classes should be passed to the rule.addTarget() method.

Currently supported are:

Start a CodeBuild build
Start a CodePipeline pipeline
Run an ECS task
Invoke a Lambda function
Invoke a API Gateway REST API
Publish a message to an SNS topic
Send a message to an SQS queue
Start a StepFunctions state machine
Queue a Batch job
Make an AWS API call
Put a record to a Kinesis stream
Log an event into a LogGroup
Put a record to a Kinesis Data Firehose stream
Put an event on an EventBridge bus

See the README of the @aws-cdk/aws-events library for more information on EventBridge.

Event retry policy and using dead-letter queues

The Codebuild, CodePipeline, Lambda, StepFunctions and LogGroup targets support attaching a dead letter queue and setting retry policies. See the lambda example. Use escape hatches for the other target types.

Invoke a Lambda function

Use the LambdaFunction target to invoke a lambda function.

The code snippet below creates an event rule with a Lambda function as a target triggered for every events from aws.ec2 source. You can optionally attach a dead letter queue.

import * as lambda from '@aws-cdk/aws-lambda';

const fn = new lambda.Function(this, 'MyFunc', {
  runtime: lambda.Runtime.NODEJS_12_X,
  handler: 'index.handler',
  code: lambda.Code.fromInline(`exports.handler = handler.toString()`),
});

const rule = new events.Rule(this, 'rule', {
  eventPattern: {
    source: ["aws.ec2"],
  },
});

const queue = new sqs.Queue(this, 'Queue');

rule.addTarget(new targets.LambdaFunction(fn, {
  deadLetterQueue: queue, // Optional: add a dead letter queue
  maxEventAge: cdk.Duration.hours(2), // Otional: set the maxEventAge retry policy
  retryAttempts: 2, // Optional: set the max number of retry attempts
}));

Log an event into a LogGroup

Use the LogGroup target to log your events in a CloudWatch LogGroup.

For example, the following code snippet creates an event rule with a CloudWatch LogGroup as a target. Every events sent from the aws.ec2 source will be sent to the CloudWatch LogGroup.

import * as logs from '@aws-cdk/aws-logs';

const logGroup = new logs.LogGroup(this, 'MyLogGroup', {
  logGroupName: 'MyLogGroup',
});

const rule = new events.Rule(this, 'rule', {
  eventPattern: {
    source: ["aws.ec2"],
  },
});

rule.addTarget(new targets.CloudWatchLogGroup(logGroup));

Start a CodeBuild build

Use the CodeBuildProject target to trigger a CodeBuild project.

The code snippet below creates a CodeCommit repository that triggers a CodeBuild project on commit to the master branch. You can optionally attach a dead letter queue.

import * as codebuild from '@aws-cdk/aws-codebuild';
import * as codecommit from '@aws-cdk/aws-codecommit';

const repo = new codecommit.Repository(this, 'MyRepo', {
  repositoryName: 'aws-cdk-codebuild-events',
});

const project = new codebuild.Project(this, 'MyProject', {
  source: codebuild.Source.codeCommit({ repository: repo }),
});

const deadLetterQueue = new sqs.Queue(this, 'DeadLetterQueue');

// trigger a build when a commit is pushed to the repo
const onCommitRule = repo.onCommit('OnCommit', {
  target: new targets.CodeBuildProject(project, {
    deadLetterQueue: deadLetterQueue,
  }),
  branches: ['master'],
});

Start a CodePipeline pipeline

Use the CodePipeline target to trigger a CodePipeline pipeline.

The code snippet below creates a CodePipeline pipeline that is triggered every hour

import * as codepipeline from '@aws-cdk/aws-codepipeline';

const pipeline = new codepipeline.Pipeline(this, 'Pipeline');

const rule = new events.Rule(this, 'Rule', {
  schedule: events.Schedule.expression('rate(1 hour)'),
});

rule.addTarget(new targets.CodePipeline(pipeline));

Start a StepFunctions state machine

Use the SfnStateMachine target to trigger a State Machine.

The code snippet below creates a Simple StateMachine that is triggered every minute with a dummy object as input. You can optionally attach a dead letter queue to the target.

import * as iam from '@aws-cdk/aws-iam';
import * as sfn from '@aws-cdk/aws-stepfunctions';

const rule = new events.Rule(this, 'Rule', {
  schedule: events.Schedule.rate(cdk.Duration.minutes(1)),
});

const dlq = new sqs.Queue(this, 'DeadLetterQueue');

const role = new iam.Role(this, 'Role', {
  assumedBy: new iam.ServicePrincipal('events.amazonaws.com'),
});
const stateMachine = new sfn.StateMachine(this, 'SM', {
  definition: new sfn.Wait(this, 'Hello', { time: sfn.WaitTime.duration(cdk.Duration.seconds(10)) }),
  role,
});

rule.addTarget(new targets.SfnStateMachine(stateMachine, {
  input: events.RuleTargetInput.fromObject({ SomeParam: 'SomeValue' }),
  deadLetterQueue: dlq,
}));

Queue a Batch job

Use the BatchJob target to queue a Batch job.

The code snippet below creates a Simple JobQueue that is triggered every hour with a dummy object as input. You can optionally attach a dead letter queue to the target.

import * as batch from '@aws-cdk/aws-batch';
import { ContainerImage } from '@aws-cdk/aws-ecs';

const jobQueue = new batch.JobQueue(this, 'MyQueue', {
  computeEnvironments: [
    {
      computeEnvironment: new batch.ComputeEnvironment(this, 'ComputeEnvironment', {
        managed: false,
      }),
      order: 1,
    },
  ],
});

const jobDefinition = new batch.JobDefinition(this, 'MyJob', {
  container: {
    image: ContainerImage.fromRegistry('test-repo'),
  },
});

const queue = new sqs.Queue(this, 'Queue');

const rule = new events.Rule(this, 'Rule', {
  schedule: events.Schedule.rate(cdk.Duration.hours(1)),
});

rule.addTarget(new targets.BatchJob(
  jobQueue.jobQueueArn,
  jobQueue,
  jobDefinition.jobDefinitionArn,
  jobDefinition, {
    deadLetterQueue: queue,
    event: events.RuleTargetInput.fromObject({ SomeParam: 'SomeValue' }),
    retryAttempts: 2,
    maxEventAge: cdk.Duration.hours(2),
  },
));

Invoke a API Gateway REST API

Use the ApiGateway target to trigger a REST API.

The code snippet below creates a Api Gateway REST API that is invoked every hour.

import * as api from '@aws-cdk/aws-apigateway';
import * as lambda from '@aws-cdk/aws-lambda';

const rule = new events.Rule(this, 'Rule', {
  schedule: events.Schedule.rate(cdk.Duration.minutes(1)),
});

const fn = new lambda.Function( this, 'MyFunc', {
  handler: 'index.handler',
  runtime: lambda.Runtime.NODEJS_12_X,
  code: lambda.Code.fromInline( 'exports.handler = e => {}' ),
} );

const restApi = new api.LambdaRestApi( this, 'MyRestAPI', { handler: fn } );

const dlq = new sqs.Queue(this, 'DeadLetterQueue');

rule.addTarget(
  new targets.ApiGateway( restApi, {
    path: '/*/test',
    method: 'GET',
    stage:  'prod',
    pathParameterValues: ['path-value'],
    headerParameters: {
      Header1: 'header1',
    },
    queryStringParameters: {
      QueryParam1: 'query-param-1',
    },
    deadLetterQueue: dlq
  } ),
)