@aws-solutions-constructs/aws-dynamodbstreams-lambda
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    2.10.0 • Public • Published

    aws-dynamodbstreams-lambda module


    Stability: Experimental

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 This means that while you may use them, you may need to update your source code when upgrading to a newer version of this package.


    Reference Documentation: https://docs.aws.amazon.com/solutions/latest/constructs/
    Language Package
    Python Logo Python aws_solutions_constructs.aws_dynamodbstreams_lambda
    Typescript Logo Typescript @aws-solutions-constructs/aws-dynamodbstreams-lambda
    Java Logo Java software.amazon.awsconstructs.services.dynamodbstreamslambda

    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

    import { Construct } from 'constructs';
    import { Stack, StackProps } from 'aws-cdk-lib';
    import { DynamoDBStreamsToLambdaProps,  DynamoDBStreamsToLambda} from '@aws-solutions-constructs/aws-dynamodbstreams-lambda';
    import * as lambda from 'aws-cdk-lib/aws-lambda';
    
    new DynamoDBStreamsToLambda(this, 'test-dynamodbstreams-lambda', {
      lambdaFunctionProps: {
          code: lambda.Code.fromAsset(`lambda`),
          runtime: lambda.Runtime.NODEJS_14_X,
          handler: 'index.handler'
      },
    });

    Python

    from aws_solutions_constructs.aws_dynamodbstreams_lambda import DynamoDBStreamsToLambda
    from aws_cdk import (
      aws_lambda as _lambda,
      Stack
    )
    from constructs import Construct
    
    DynamoDBStreamsToLambda(self, 'test-dynamodbstreams-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.dynamodbstreamslambda.*;
    
    new DynamoDBStreamsToLambda(this, "test-dynamodbstreams-lambda",
            new DynamoDBStreamsToLambdaProps.Builder()
                    .lambdaFunctionProps(new FunctionProps.Builder()
                            .runtime(Runtime.NODEJS_14_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
    existingTableInterface? dynamodb.ITable Existing instance of DynamoDB table object or interface, providing both this and dynamoTableProps will cause an error.
    dynamoEventSourceProps? aws-lambda-event-sources.DynamoEventSourceProps Optional user provided props to override the default props for DynamoDB Event Source

    Pattern Properties

    Name Type Description
    dynamoTableInterface dynamodb.ITable Returns an instance of dynamodb.ITable created by the construct
    dynamoTable? dynamodb.Table Returns an instance of dynamodb.Table created by the construct. IMPORTANT: If existingTableInterface was provided in Pattern Construct Props, this property will be undefined
    lambdaFunction lambda.Function Returns an instance of lambda.Function created by the construct

    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

    Architecture Diagram


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    Install

    npm i @aws-solutions-constructs/aws-dynamodbstreams-lambda

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    Version

    2.10.0

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    Collaborators

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