aws-lambda-sns - AWS Solutions Constructs

aws-lambda-sns

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 This means that while you may use them, you may need to update your source code when upgrading to a newer version of this package.

Language Package
Python
aws_solutions_constructs.aws_lambda_sns
Typescript
@aws-solutions-constructs/aws-lambda-sns
Java
software.amazon.awsconstructs.services.lambdasns

This AWS Solutions Construct implements an AWS Lambda function connected to an Amazon SNS topic.

Here is a minimal deployable pattern definition in TypeScript:

import { LambdaToSns, LambdaToSnsProps } from "@aws-solutions-constructs/aws-lambda-sns"; new LambdaToSns(this, 'test-lambda-sns', { lambdaFunctionProps: { runtime: lambda.Runtime.NODEJS_12_X, handler: 'index.handler', code: lambda.Code.fromAsset(`${__dirname}/lambda`) } });

Initializer

new LambdaToSns(scope: Construct, id: string, props: LambdaToSnsProps);

Parameters

Pattern Construct Props

Name Type Description
existingLambdaObj? lambda.Function An optional, existing Lambda function to be used instead of the default function. If an existing function is provided, the lambdaFunctionProps property will be ignored.
lambdaFunctionProps? lambda.FunctionProps Optional user-provided properties to override the default properties for the Lambda function. Ignored if an existingLambdaObj is provided.
existingTopicObj? sns.Topic An optional, existing SNS topic to be used instead of the default topic. If an existing topic is provided, the topicProps property will be ignored.
topicProps? sns.TopicProps Optional user provided properties to override the default properties for the SNS topic.
existingVpc? ec2.IVpc An optional, existing VPC into which this pattern should be deployed. When deployed in a VPC, the Lambda function will use ENIs in the VPC to access network resources and an Interface Endpoint will be created in the VPC for Amazon SQS. If an existing VPC is provided, the deployVpc property cannot be true. This uses ec2.IVpc to allow clients to supply VPCs that exist outside the stack using the ec2.Vpc.fromLookup() method.
deployVpc? boolean Whether to create a new VPC based on vpcProps into which to deploy this pattern. Setting this to true will deploy the minimal, most private VPC to run the pattern:
  • One isolated subnet in each Availability Zone used by the CDK program.

  • enableDnsHostnames and enableDnsSupport will both be set to true.

If this property is true, then existingVpc cannot be specified. Defaults to false.
vpcProps? ec2.VpcProps Optional user-provided properties to override the default properties for the new VPC. enableDnsHostnames, enableDnsSupport, natGateways and subnetConfiguration are set by the pattern, so any values for those properties supplied here will be overrriden. If deployVpc is not true then this property will be ignored.

Pattern Properties

Name Type Description
lambdaFunction lambda.Function Returns an instance of the Lambda function created by the pattern.
snsTopic sns.Topic Returns an instance of the SNS topic created by the pattern.
vpc? ec2.IVpc Returns an instance of the VPC used by the pattern (if any). This may be a VPC created by the pattern or the VPC supplied to the pattern constructor.

Default settings

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

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:

    • SNS_TOPIC_NAME

    • SNS_TOPIC_ARN

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

Amazon SNS Topic

  • Configure least privilege access permissions for SNS topic.

  • Enable server-side encryption using AWS managed KMS key.

  • Enforce encryption of data in transit.

Architecture

GitHub

To view the code for this pattern, create/view issues and pull requests, and more:
@aws-solutions-constructs/aws-lambda-sns