@aws-solutions-constructs/aws-sns-lambda

aws-sns-lambda module

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

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

Overview

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

Here is a minimal deployable pattern definition:

Typescript

import { Construct } from 'constructs';
import { Stack, StackProps } from 'aws-cdk-lib';
import { SnsToLambda, SnsToLambdaProps } from "@aws-solutions-constructs/aws-sns-lambda";
import * as lambda from 'aws-cdk-lib/aws-lambda';

new SnsToLambda(this, 'test-sns-lambda', {
  lambdaFunctionProps: {
    runtime: lambda.Runtime.NODEJS_16_X,
    handler: 'index.handler',
    code: lambda.Code.fromAsset(`lambda`)
  }
});

Python

from aws_solutions_constructs.aws_sns_lambda import SnsToLambda
from aws_cdk import (
    aws_lambda as _lambda,
    Stack
)
from constructs import Construct

SnsToLambda(self, 'test_sns_lambda',
            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.snslambda.*;

new SnsToLambda(this, "test-lambda-sqs-stack", new SnsToLambdaProps.Builder()
        .lambdaFunctionProps(new FunctionProps.Builder()
                .runtime(Runtime.NODEJS_16_X)
                .code(Code.fromAsset("lambda"))
                .handler("index.handler")
                .build())
        .build());

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	User provided props to override the default props for the Lambda function.
existingTopicObj?	sns.Topic	Existing instance of SNS Topic object, providing both this and topicProps will cause an error.
topicProps?	sns.TopicProps	Optional user provided properties to override the default properties for the SNS topic.
enableEncryptionWithCustomerManagedKey?	boolean	If no key is provided, this flag determines whether the SNS Topic is encrypted with a new CMK or an AWS managed key. This flag is ignored if any of the following are defined: topicProps.masterKey, encryptionKey or encryptionKeyProps.
encryptionKey?	kms.Key	An optional, imported encryption key to encrypt the SNS Topic with.
encryptionKeyProps?	kms.KeyProps	Optional user provided properties to override the default properties for the KMS encryption key used to encrypt the SNS Topic with.

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.

Default settings

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

Amazon SNS Topic

• Configure least privilege access permissions for SNS Topic
• Enable server-side encryption for SNS Topic using AWS managed KMS Key
• Enforce encryption of data in transit

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)

Architecture

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