aws-lambda-sqs-lambda module

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 This means that while you may use them, you may need to update your source code when upgrading to a newer version of this package.

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Reference Documentation:	https://docs.aws.amazon.com/solutions/latest/constructs/

Language	Package
Python	aws_solutions_constructs.aws_lambda_sqs_lambda
Typescript	@aws-solutions-constructs/aws-lambda-sqs-lambda
Java	software.amazon.awsconstructs.services.lambdasqslambda

This AWS Solutions Construct implements (1) an AWS Lambda function that is configured to send messages to a queue; (2) an Amazon SQS queue; and (3) an AWS Lambda function configured to consume messages from the queue.

Here is a minimal deployable pattern definition in Typescript:

import { LambdaToSqsToLambda, LambdaToSqsToLambdaProps } from "@aws-solutions-constructs/aws-lambda-sqs-lambda";

new LambdaToSqsToLambda(this, 'LambdaToSqsToLambdaPattern', {
  producerLambdaFunctionProps: {
      runtime: lambda.Runtime.NODEJS_14_X,
      handler: 'index.handler',
      code: lambda.Code.fromAsset(`${__dirname}/lambda/producer-function`)
  },
  consumerLambdaFunctionProps: {
    runtime: lambda.Runtime.NODEJS_14_X,
    handler: 'index.handler',
    code: lambda.Code.fromAsset(`${__dirname}/lambda/consumer-function`)
  }
});

Initializer

new LambdaToSqsToLambda(scope: Construct, id: string, props: LambdaToSqsToLambdaProps);

Parameters

• scope Construct
• id string
• props LambdaToSqsToLambdaProps

Pattern Construct Props

Name	Type	Description
existingProducerLambdaObj?	lambda.Function	An optional, existing Lambda function to be used instead of the default function for sending messages to the queue. Providing both this and producerLambdaFunctionProps will cause an error.
producerLambdaFunctionProps?	lambda.FunctionProps	Optional user-provided properties to override the default properties for the producer Lambda function.
existingQueueObj?	sqs.Queue	An optional, existing SQS queue to be used instead of the default queue. Providing both this and queueProps will cause an error.
queueProps?	sqs.QueueProps	Optional user-provided properties to override the default properties for the SQS queue. Providing both this and existingQueueObj will cause an error.
deployDeadLetterQueue?	boolean	Whether to create a secondary queue to be used as a dead letter queue. Defaults to true.
deadLetterQueueProps?	sqs.QueueProps	Optional user-provided props to override the default props for the dead letter queue. Only used if the deployDeadLetterQueue property is set to true.
maxReceiveCount?	number	The number of times a message can be unsuccessfully dequeued before being moved to the dead letter queue. Defaults to 15.
existingConsumerLambdaObj?	lambda.Function	An optional, existing Lambda function to be used instead of the default function for receiving/consuming messages from the queue. Providing both this and consumerLambdaFunctionProps will cause an error.
consumerLambdaFunctionProps?	lambda.FunctionProps	Optional user-provided properties to override the default properties for the consumer Lambda function.
queueEnvironmentVariableName?	string	Optional Name for the SQS queue URL environment variable set for the producer Lambda function.
sqsEventSourceProps?	SqsEventSourceProps	Optional user provided properties for the queue event source.
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.
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.
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.

Pattern Properties

Name	Type	Description
producerLambdaFunction	lambda.Function	Returns an instance of the producer Lambda function created by the pattern.
sqsQueue	sqs.Queue	Returns an instance of the SQS queue created by the pattern.
deadLetterQueue?	sqs.Queue | undefined	Returns an instance of the dead letter queue created by the pattern, if one is deployed.
consumerLambdaFunction	lambda.Function	Returns an instance of the consumer Lambda function created by the pattern.
vpc?	ec2.IVpc	Returns an interface on 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 this Construct (without any overridden properties) will adhere to the following defaults:

AWS Lambda Functions

• Configure limited privilege access IAM role for Lambda functions.
• Enable reusing connections with Keep-Alive for NodeJs Lambda functions.
• Enable X-Ray Tracing
• Set Environment Variables
  • AWS_NODEJS_CONNECTION_REUSE_ENABLED (for Node 10.x and higher functions)

Amazon SQS Queue

• Deploy a dead letter queue for the primary queue.
• Enable server-side encryption for the primary queue using an AWS Managed KMS Key.
• Enforce encryption of data in transit

Architecture

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