aws-solutions-constructs.aws-dynamodb-stream-lambda 1.181.1

Description:

awssolutionsconstructs.awsdynamodbstreamlambda 1.181.1

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.






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







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



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


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