aws-dynamodb-stream-lambda module

> Some of our early constructs don’t meet the naming standards that evolved for the library. We are releasing completely feature compatible versions with corrected names. The underlying implementation code is the same regardless of whether you deploy the construct using the old or new name. We will support both names for all 1.x releases, but in 2.x we will only publish the correctly named constructs. This construct is being replaced by the functionally identical aws-dynamodbstreams-lambda.

Language	Package
Python	aws_solutions_constructs.aws_dynamodb_stream_lambda
Typescript	@aws-solutions-constructs/aws-dynamodb-stream-lambda
Java	software.amazon.awsconstructs.services.dynamodbstreamlambda

Overview

This AWS Solutions Construct implements a pattern Amazon DynamoDB table with stream to invoke the AWS Lambda function with the least privileged permissions.

Here is a minimal deployable pattern definition:

Typescript

// aws-dynamodb-stream-lambda has been deprecated for CDK V2 in favor of aws-dynamodbstreams-lambda.
// This sample uses the CDK V1 syntax
import * as cdk from '@aws-cdk/core';
import { DynamoDBStreamToLambda } from '@aws-solutions-constructs/aws-dynamodb-stream-lambda';
import * as lambda from '@aws-cdk/aws-lambda';

new DynamoDBStreamToLambda(this, 'test-dynamodb-stream-lambda', {
  lambdaFunctionProps: {
    code: lambda.Code.fromAsset(`lambda`),
    runtime: lambda.Runtime.NODEJS_14_X,
    handler: 'index.handler'
  },
});

Python

# aws-dynamodb-stream-lambda has been deprecated for CDK V2 in favor of aws-dynamodbstreams-lambda.
# This sample uses the CDK V1 syntax
from aws_solutions_constructs.aws_dynamodb_stream_lambda import DynamoDBStreamToLambda
from aws_cdk import (
    aws_lambda as _lambda,
    core,
)

DynamoDBStreamToLambda(self, 'test-dynamodb-stream-lambda',
                       lambda_function_props=_lambda.FunctionProps(
                           code=_lambda.Code.from_asset('lambda'),
                           runtime=_lambda.Runtime.PYTHON_3_9,
                           handler='index.handler'
                       )
                       )

Java

// aws-dynamodb-stream-lambda has been deprecated for CDK V2 in favor of aws-dynamodbstreams-lambda.
// This sample uses the CDK V1 syntax
import software.constructs.Construct;

import software.amazon.awscdk.core.*;
import software.amazon.awscdk.services.lambda.*;
import software.amazon.awscdk.services.lambda.Runtime;
import software.amazon.awsconstructs.services.dynamodbstreamlambda.*;

new DynamoDBStreamToLambda(this, "test-dynamodbstreams-lambda",
        new DynamoDBStreamToLambdaProps.Builder()
                .lambdaFunctionProps(new FunctionProps.Builder()
                        .runtime(Runtime.NODEJS_14_X)
                        .code(Code.fromAsset("lambda"))
                        .handler("index.handler")
                        .build())
                .build());

Pattern Construct Props

Pattern Properties

Lambda Function

This pattern requires a lambda function that can post data into the Elasticsearch. A sample function is provided here.

Default settings

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

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

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

• Enable Failure-Handling features like enable bisect on function Error, set defaults for Maximum Record Age (24 hours) & Maximum Retry Attempts (500) and deploy SQS dead-letter queue as destination on failure

• Set Environment Variables

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

Architecture

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