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@aws-solutions-constructs/aws-lambda-sqs

v2.8.0

Published

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

Downloads

10,159

Readme

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|

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 programenableDnsHostnames and enableDnsSupport will both be set to trueIf 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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