aws-sns-lambda module

| 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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