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CDK Constructs for AWS S3 to AWS Step Functions integration




aws-s3-stepfunctions module

Stability: Experimental

All classes are under active development and subject to non-backward compatible changes or removal in any future version. These are not subject to the Semantic Versioning model. This means that while you may use them, you may need to update your source code when upgrading to a newer version of this package.

| Reference Documentation:|| |:-------------|:-------------|

| Language | Package | |:-------------|-----------------| |Python Logo Python|aws_solutions_constructs.aws_s3_stepfunctions| |Typescript Logo Typescript|@aws-solutions-constructs/aws-s3-stepfunctions| |Java Logo Java||

This AWS Solutions Construct implements an Amazon S3 bucket connected to an AWS Step Functions.

Note - This constructs sends S3 Event Notification to EventBridge, then triggers AWS Step Functions State Machine executions from EventBridge.

An alternative architecture can be built that triggers a Lambda function from S3 Event notifications using aws-s3-lambda and aws-lambda-stepfunctions. Channelling the S3 events through Lambda is less flexible than EventBridge, but is more cost effective and has lower latency.

Here is a minimal deployable pattern definition in Typescript:

import { S3ToStepfunctions, S3ToStepfunctionsProps } from '@aws-solutions-constructs/aws-s3-stepfunctions';
import * as stepfunctions from '@aws-cdk/aws-stepfunctions';

const startState = new stepfunctions.Pass(stack, 'StartState');

new S3ToStepfunctions(this, 'test-s3-stepfunctions-stack', {
    stateMachineProps: {
      definition: startState


new S3ToStepfunctions(scope: Construct, id: string, props: S3ToStepfunctionsProps);


Pattern Construct Props

| Name | Type | Description | |:-------------|:----------------|-----------------| |existingBucketObj?|s3.IBucket|Existing instance of S3 Bucket object. The existing bucket must have EventBridge enabled for this to work. If this is provided, then also providing bucketProps is an error.| |bucketProps?|s3.BucketProps|Optional user provided props to override the default props for the S3 Bucket.| |stateMachineProps|sfn.StateMachineProps|User provided props to override the default props for sfn.StateMachine.| |eventRuleProps?|events.RuleProps|Optional user provided eventRuleProps to override the defaults.| |deployCloudTrail?|boolean|Whether to deploy a Trail in AWS CloudTrail to log API events in Amazon S3. Defaults to true. This is now deprecated and ignored because the construct no longer needs CloudTrail since it uses S3 Event Notifications.| |createCloudWatchAlarms|boolean|Whether to create recommended CloudWatch alarms.| |logGroupProps?|logs.LogGroupProps|Optional user provided props to override the default props for for the CloudWatchLogs LogGroup.| |loggingBucketProps?|s3.BucketProps|Optional user provided props to override the default props for the S3 Logging Bucket.| |logS3AccessLogs?| boolean|Whether to turn on Access Logging for the S3 bucket. Creates an S3 bucket with associated storage costs for the logs. Enabling Access Logging is a best practice. default - true|

Pattern Properties

| Name | Type | Description | |:-------------|:----------------|-----------------| |stateMachine|sfn.StateMachine|Returns an instance of sfn.StateMachine created by the construct.| |stateMachineLogGroup|logs.ILogGroup|Returns an instance of the ILogGroup created by the construct for StateMachine.| |cloudwatchAlarms?|cloudwatch.Alarm[]|Returns a list of cloudwatch.Alarm created by the construct.| |s3Bucket?|s3.Bucket|Returns an instance of the s3.Bucket created by the construct.| |s3LoggingBucket?|s3.Bucket|Returns an instance of s3.Bucket created by the construct as the logging bucket for the primary bucket.| |s3BucketInterface|s3.IBucket|Returns an instance of s3.IBucket created by the construct.|

Note - with the release of Enable EventBridge for Amazon S3, AWS CloudTrail is no longer required to implement this construct. Because of this, the following properties have been removed:

  • cloudtrail
  • cloudtrailBucket
  • cloudtrailLoggingBucket

Default settings

Out of the box implementation of the Construct without any override will set the following defaults:

Amazon S3 Bucket

  • Enable EventBridge to send events from the S3 Bucket
  • Configure Access logging for S3 Bucket
  • Enable server-side encryption for S3 Bucket using AWS managed KMS Key
  • Enforce encryption of data in transit
  • Turn on the versioning for S3 Bucket
  • Don't allow public access for S3 Bucket
  • Retain the S3 Bucket when deleting the CloudFormation stack
  • Applies Lifecycle Rule to move noncurrent object versions to Glacier storage after 90 days

AWS S3 Event Notification

  • Enable S3 to send events to EventBridge when an object is created.

Amazon CloudWatch Events Rule

  • Grant least privilege permissions to CloudWatch Events to trigger the Lambda Function

AWS Step Functions

  • Enable CloudWatch logging for API Gateway
  • Deploy best practices CloudWatch Alarms for the Step Functions


Architecture Diagram

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