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Description:

awssolutionsconstructs.awslambdadynamodb 2.70.0

aws-lambda-dynamodb module
---

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

Language
Package

Python
aws_solutions_constructs.aws_lambda_dynamodb

Typescript
@aws-solutions-constructs/aws-lambda-dynamodb

Java
software.amazon.awsconstructs.services.lambdadynamodb

Overview
This AWS Solutions Construct implements the AWS Lambda function and Amazon DynamoDB table with the least privileged permissions.
Here is a minimal deployable pattern definition:
Typescript
import { Construct } from 'constructs';
import { Stack, StackProps } from 'aws-cdk-lib';
import { LambdaToDynamoDBProps, LambdaToDynamoDB } from '@aws-solutions-constructs/aws-lambda-dynamodb';
import * as lambda from 'aws-cdk-lib/aws-lambda';

const constructProps: LambdaToDynamoDBProps = {
lambdaFunctionProps: {
code: lambda.Code.fromAsset(`lambda`),
runtime: lambda.Runtime.NODEJS_16_X,
handler: 'index.handler'
},
};

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

Python
from aws_solutions_constructs.aws_lambda_dynamodb import LambdaToDynamoDBProps, LambdaToDynamoDB
from aws_cdk import (
aws_lambda as _lambda,
Stack
)
from constructs import Construct

LambdaToDynamoDB(self, 'test_lambda_dynamodb_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.lambdadynamodb.*;

new LambdaToDynamoDB(this, "test_lambda_dynamodb_stack", new LambdaToDynamoDBProps.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.

dynamoTableProps?
dynamodb.TableProps
Optional user provided props to override the default props for DynamoDB Table

existingTableObj?
dynamodb.Table
Existing instance of DynamoDB table object, providing both this and dynamoTableProps will cause an error.

tablePermissions?
string
Optional table permissions to grant to the Lambda function. One of the following may be specified: All, Read, ReadWrite, Write.

tableEnvironmentVariableName?
string
Optional Name for the Lambda function environment variable set to the name of the DynamoDB table. Default: DDB_TABLE_NAME

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 a Gateway Endpoint will be created in the VPC for Amazon DynamoDB. 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 overridden. 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.

Pattern Properties

Name
Type
Description

lambdaFunction
lambda.Function
Returns an instance of lambda.Function created by the construct

dynamoTable
dynamodb.Table
Returns an instance of dynamodb.Table created by the construct

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

Enable X-Ray Tracing

Set Environment Variables

(default) 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

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