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CDK constructs for defining an interaction between an AWS Lambda function and an Amazon SQS queue.

Project description

aws-lambda-sqs module

---

Stability: Stable


Reference Documentation: https://docs.aws.amazon.com/solutions/latest/constructs/
Language Package
Python Logo Python aws_solutions_constructs.aws_lambda_sqs
Typescript Logo Typescript @aws-solutions-constructs/aws-lambda-sqs
Java Logo Java software.amazon.awsconstructs.services.lambdasqs

Overview

This AWS Solutions Construct implements an AWS Lambda function connected to an Amazon SQS queue.

Here is a minimal deployable pattern definition:

Typescript

import { Construct } from 'constructs';
import { Stack, StackProps } from 'aws-cdk-lib';
import { LambdaToSqs, LambdaToSqsProps } from "@aws-solutions-constructs/aws-lambda-sqs";
import * as lambda from 'aws-cdk-lib/aws-lambda';

new LambdaToSqs(this, 'LambdaToSqsPattern', {
  lambdaFunctionProps: {
    runtime: lambda.Runtime.NODEJS_14_X,
    handler: 'index.handler',
    code: lambda.Code.fromAsset(`lambda`)
  }
});

Python

from aws_solutions_constructs.aws_lambda_sqs import LambdaToSqs
from aws_cdk import (
    aws_lambda as _lambda,
    Stack
)
from constructs import Construct

LambdaToSqs(
    self, 'test-lambda-sqs-stack',
    lambda_function_props=_lambda.FunctionProps(
        code=_lambda.Code.from_asset('lambda'),
        runtime=_lambda.Runtime.PYTHON_3_9,
        handler='index.handler'
    )
)

Java

import software.constructs.Construct;

import software.amazon.awscdk.Stack;
import software.amazon.awscdk.StackProps;
import software.amazon.awscdk.services.lambda.*;
import software.amazon.awscdk.services.lambda.Runtime;
import software.amazon.awsconstructs.services.lambdasqs.*;

new LambdaToSqs(this, "test-lambda-sqs-stack", new LambdaToSqsProps.Builder()
        .lambdaFunctionProps(new FunctionProps.Builder()
                .runtime(Runtime.NODEJS_14_X)
                .code(Code.fromAsset("lambda"))
                .handler("index.handler")
                .build())
        .build());

Pattern Construct Props

Name Type Description
existingLambdaObj? lambda.Function An optional, existing Lambda function to be used instead of the default function. Providing both this and lambdaFunctionProps will cause an error.
lambdaFunctionProps? lambda.FunctionProps Optional user-provided properties to override the default properties for the 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.
enableQueuePurging? boolean Whether to grant additional permissions to the Lambda function enabling it to purge the SQS queue. Defaults to false.
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.
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.
queueEnvironmentVariableName? string Optional Name for the Lambda function environment variable set to the URL of the queue. Default: SQS_QUEUE_URL

Pattern Properties

Name Type Description
lambdaFunction lambda.Function Returns an instance of the Lambda function created by the pattern.
sqsQueue sqs.Queue Returns an instance of the SQS queue created by the pattern.
deadLetterQueue? sqs.Queue Returns an instance of the dead letter queue created by the pattern, if one is deployed.
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 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.

  • Allow the function to send messages only to the queue (purging can be enabled using the enableQueuePurge property).

  • Enable X-Ray Tracing

  • Set Environment Variables

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

Amazon SQS Queue

  • Deploy SQS dead-letter queue for the source SQS Queue.
  • Enable server-side encryption for source SQS Queue using AWS Managed KMS Key.
  • Enforce encryption of data in transit

Architecture

Architecture Diagram


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