aws-solutions-constructs.aws-iot-lambda-dynamodb 2.74.0

CDK Constructs for AWS IoT to AWS Lambda to AWS DyanmoDB integration.

aws-iot-lambda-dynamodb module

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 This means that while you may use them, you may need to update your source code when upgrading to a newer version of this package.

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

Language	Package
Python	aws_solutions_constructs.aws_iot_lambda_dynamodb
Typescript	@aws-solutions-constructs/aws-iot-lambda-dynamodb
Java	software.amazon.awsconstructs.services.iotlambdadynamodb

Overview

This AWS Solutions Construct implements an AWS IoT topic rule, an 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 { IotToLambdaToDynamoDBProps, IotToLambdaToDynamoDB } from '@aws-solutions-constructs/aws-iot-lambda-dynamodb';
import * as lambda from 'aws-cdk-lib/aws-lambda';

const constructProps: IotToLambdaToDynamoDBProps = {
  lambdaFunctionProps: {
      code: lambda.Code.fromAsset(`lambda`),
      runtime: lambda.Runtime.NODEJS_16_X,
      handler: 'index.handler'
  },
  iotTopicRuleProps: {
      topicRulePayload: {
          ruleDisabled: false,
          description: "Processing of DTC messages from the AWS Connected Vehicle Solution.",
          sql: "SELECT * FROM 'connectedcar/dtc/#'",
          actions: []
      }
  }
};

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

Python

from aws_solutions_constructs.aws_iot_lambda_dynamodb import IotToLambdaToDynamoDB
from aws_cdk import (
    aws_iot as iot,
    aws_lambda as _lambda,
    Stack
)
from constructs import Construct

IotToLambdaToDynamoDB(self, 'test-iot-lambda-dynamodb-stack',
            lambda_function_props=_lambda.FunctionProps(
                code=_lambda.Code.from_asset('lambda'),
                runtime=_lambda.Runtime.PYTHON_3_9,
                handler='index.handler'
            ),
            iot_topic_rule_props=iot.CfnTopicRuleProps(
                topic_rule_payload=iot.CfnTopicRule.TopicRulePayloadProperty(
                    rule_disabled=False,
                    description="Processing of DTC messages from the AWS Connected Vehicle Solution.",
                    sql="SELECT * FROM 'connectedcar/dtc/#'",
                    actions=[]
                )
            ))

Java

import software.constructs.Construct;
import java.util.List;

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.awscdk.services.iot.*;
import software.amazon.awscdk.services.iot.CfnTopicRule.TopicRulePayloadProperty;
import software.amazon.awsconstructs.services.iotlambdadynamodb.*;

new IotToLambdaToDynamoDB(this, "test-iot-lambda-dynamodb-stack", new IotToLambdaToDynamoDBProps.Builder()
        .lambdaFunctionProps(new FunctionProps.Builder()
                .runtime(Runtime.NODEJS_16_X)
                .code(Code.fromAsset("lambda"))
                .handler("index.handler")
                .build())
        .iotTopicRuleProps(new CfnTopicRuleProps.Builder()
                .topicRulePayload(new TopicRulePayloadProperty.Builder()
                        .ruleDisabled(false)
                        .description("Processing of DTC messages from the AWS Connected Vehicle Solution.")
                        .sql("SELECT * FROM 'connectedcar/dtc/#'")
                        .actions(List.of())
                        .build())
                .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.
iotTopicRuleProps	iot.CfnTopicRuleProps	User provided props to override the default props
dynamoTableProps?	dynamodb.TableProps	Optional user provided props to override the default props for DynamoDB Table
tablePermissions?	string	Optional table permissions to grant to the Lambda function. One of the following may be specified: All, Read, ReadWrite, Write.
existingTableObj?	dynamodb.Table	Existing instance of DynamoDB table object, providing both this and dynamoTableProps will cause an error.
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 program enableDnsHostnames and enableDnsSupport will both be set to true If this property is true then existingVpc cannot be specified. Defaults to false.

Pattern Properties

Name	Type	Description
iotTopicRule	iot.CfnTopicRule	Returns an instance of iot.CfnTopicRule created by the construct
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:

Amazon IoT Rule

• Configure least privilege access IAM role for Amazon IoT

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)

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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