aws-s3-lambda - AWS Solutions Constructs


Note: To ensure proper functionality, the AWS Solutions Constructs packages and AWS CDK packages in your project must be the same version.

Language Package


This AWS Solutions Construct implements an Amazon S3 bucket connected to an AWS Lambda function.

Here is a minimal deployable pattern definition in TypeScript:

import { S3ToLambdaProps, S3ToLambda } from '@aws-solutions-constructs/aws-s3-lambda'; new S3ToLambda(this, 'test-s3-lambda', { lambdaFunctionProps: { runtime: lambda.Runtime.NODEJS_14_X, // This assumes a handler function in lib/lambda/index.js code: lambda.Code.fromAsset(`${__dirname}/lambda`), handler: 'index.handler' }, });


new S3ToLambda(scope: Construct, id: string, props: S3ToLambdaProps);


Pattern Construct Props

Name Type Description
existingLambdaObj? lambda.Function Existing instance of Lambda Function object, providing both this and lambdaFunctionProps will cause an error.
lambdaFunctionProps? lambda.FunctionProps Optional user provided props to override the default props for the Lambda function.
existingBucketObj? s3.Bucket Existing instance of S3 Bucket object. 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.
s3EventSourceProps? S3EventSourceProps Optional user provided props to override the default props for S3EventSourceProps
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 is true.

Pattern Properties

Name Type Description
lambdaFunction lambda.Function Returns an instance of the Lambda function created by the pattern.
s3Bucket? s3.Bucket Returns an instance of the S3 bucket created by the pattern.
s3LoggingBucket? s3.Bucket Returns an instance of the logging bucket created by the pattern for the S3 bucket.
s3BucketInterface s3.IBucket Returns an instance of s3.IBucket created by the construct.

Default settings

Out-of-the-box implementation of this pattern without any overrides will set the following defaults:

Amazon S3 Bucket

  • Configure Access logging for S3 Bucket.

  • Enable server-side encryption for S3 Bucket using AWS managed KMS Key.

  • Turn on the versioning for S3 Bucket.

  • Don't allow public access for S3 Bucket.

  • Retain the S3 Bucket when deleting the CloudFormation stack.

  • Enforce encryption of data in transit.

  • Applies lifecycle rule to move noncurrent object versions to Glacier storage after 90 days.

AWS Lambda Function

  • Configure limited privilege access IAM role for Lambda function.

  • Enable reusing connections with Keep-Alive for NodeJs Lambda function.

  • Enable X-Ray tracing.

  • Set environment variables:

    • AWS_NODEJS_CONNECTION_REUSE_ENABLED (for Node 10.x and higher functions)



To view the code for this pattern, create/view issues and pull requests, and more: