aws-lambda-dynamodb

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 This means that while you may use them, you may need to update your source code when upgrading to a newer version of this package.

Language	Package
Python	aws_solutions_constructs.aws_lambda_dynamodb
Typescript	@aws-solutions-constructs/aws-lambda-dynamodb
Java	software.amazon.awsconstructs.services.lambdadynamodb

This AWS Solutions Construct implements the AWS Lambda function and Amazon DynamoDB table with least-privilege permissions.

Here is a minimal deployable pattern definition in TypeScript:

import { LambdaToDynamoDBProps,  LambdaToDynamoDB } from '@aws-solutions-constructs/aws-lambda-dynamodb';

const props: LambdaToDynamoDBProps = {
    lambdaFunctionProps: {
        code: lambda.Code.fromAsset(`${__dirname}/lambda`),
        runtime: lambda.Runtime.NODEJS_12_X,
        handler: 'index.handler'
    }
};

new LambdaToDynamoDB(this, 'test-lambda-dynamodb-stack', props);

Initializer

new LambdaToDynamoDB(scope: Construct, id: string, props: LambdaToDynamoDBProps);

Parameters

• scope Construct

• id string

• props LambdaToDynamoDBProps

Pattern Construct Props

Name	Type	Description
existingLambdaObj?	lambda.Function	An optional, existing Lambda function to be used instead of the default function. If an existing function is provided, the lambdaFunctionProps property will be ignored.
lambdaFunctionProps?	lambda.FunctionProps	Optional user-provided properties to override the default properties for the Lambda function. Ignored if an existingLambdaObj is provided.
dynamoTableProps?	dynamodb.TableProps	Optional user provided props to override the default props for DynamoDB Table
existingTableObj?	dynamodb.Table	Existing instance of DynamoDB Table. If this is set, then the dynamoTableProps is ignored.
tablePermissions?	string	Optional table permissions to be granted to the Lambda function. One of the following options may be specified: All, Read, ReadWrite, or Write.

Pattern Properties

Name	Type	Description
dynamoTable	dynamodb.Table	Returns an instance of the DynamoDB table created by the pattern.
lambdaFunction	lambda.Function	Returns an instance of the Lambda function created by the pattern.

Default settings

Out-of-the-box implementation of this pattern without any overrides 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.

• Enable X-Ray tracing.

• Set environment variables:

  • DDB_TABLE_NAME

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

Amazon DynamoDB Table

• Set the billing mode for DynamoDB Table to On-Demand (Pay per request).

• Enable server-side encryption for DynamoDB Table using AWS managed KMS Key.

• Creates a partition key called 'id' for DynamoDB Table.

• Retain the Table when deleting the CloudFormation stack.

• Enable continuous backups and point-in-time recovery.

Architecture