Metadata-Version: 2.1
Name: aws-solutions-constructs.aws-lambda-dynamodb
Version: 1.127.0
Summary: CDK Constructs for AWS Lambda to AWS DynamoDB integration.
Home-page: https://github.com/awslabs/aws-solutions-constructs.git
Author: Amazon Web Services
License: Apache-2.0
Project-URL: Source, https://github.com/awslabs/aws-solutions-constructs.git
Platform: UNKNOWN
Classifier: Intended Audience :: Developers
Classifier: Operating System :: OS Independent
Classifier: Programming Language :: JavaScript
Classifier: Programming Language :: Python :: 3 :: Only
Classifier: Programming Language :: Python :: 3.6
Classifier: Programming Language :: Python :: 3.7
Classifier: Programming Language :: Python :: 3.8
Classifier: Programming Language :: Python :: 3.9
Classifier: Typing :: Typed
Classifier: License :: OSI Approved
Requires-Python: >=3.6
Description-Content-Type: text/markdown
License-File: LICENSE

# aws-lambda-dynamodb module

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![Stability: Stable](https://img.shields.io/badge/cfn--resources-stable-success.svg?style=for-the-badge)

---
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| **Reference Documentation**:| <span style="font-weight: normal">https://docs.aws.amazon.com/solutions/latest/constructs/</span>|
|:-------------|:-------------|

<div style="height:8px"></div>

| **Language**     | **Package**        |
|:-------------|-----------------|
|![Python Logo](https://docs.aws.amazon.com/cdk/api/latest/img/python32.png) Python|`aws_solutions_constructs.aws_lambda_dynamodb`|
|![Typescript Logo](https://docs.aws.amazon.com/cdk/api/latest/img/typescript32.png) Typescript|`@aws-solutions-constructs/aws-lambda-dynamodb`|
|![Java Logo](https://docs.aws.amazon.com/cdk/api/latest/img/java32.png) Java|`software.amazon.awsconstructs.services.lambdadynamodb`|

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 in Typescript:

```javascript
const { LambdaToDynamoDBProps,  LambdaToDynamoDB } from '@aws-solutions-constructs/aws-lambda-dynamodb';

const props: LambdaToDynamoDBProps = {
    lambdaFunctionProps: {
        code: lambda.Code.fromAsset(`${__dirname}/lambda`),
        runtime: lambda.Runtime.NODEJS_12_X,
        handler: 'index.handler'
    },
};

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

```

## Initializer

```text
new LambdaToDynamoDB(scope: Construct, id: string, props: LambdaToDynamoDBProps);
```

*Parameters*

* scope [`Construct`](https://docs.aws.amazon.com/cdk/api/latest/docs/@aws-cdk_core.Construct.html)
* id `string`
* props [`LambdaToDynamoDBProps`](#pattern-construct-props)

## Pattern Construct Props

| **Name**     | **Type**        | **Description** |
|:-------------|:----------------|-----------------|
|existingLambdaObj?|[`lambda.Function`](https://docs.aws.amazon.com/cdk/api/latest/docs/@aws-cdk_aws-lambda.Function.html)|Existing instance of Lambda Function object, providing both this and `lambdaFunctionProps` will cause an error.|
|lambdaFunctionProps?|[`lambda.FunctionProps`](https://docs.aws.amazon.com/cdk/api/latest/docs/@aws-cdk_aws-lambda.FunctionProps.html)|User provided props to override the default props for the Lambda function.|
|dynamoTableProps?|[`dynamodb.TableProps`](https://docs.aws.amazon.com/cdk/api/latest/docs/@aws-cdk_aws-dynamodb.TableProps.html)|Optional user provided props to override the default props for DynamoDB Table|
|existingTableObj?|[`dynamodb.Table`](https://docs.aws.amazon.com/cdk/api/latest/docs/@aws-cdk_aws-dynamodb.Table.html)|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 DynamoDB table environment variable set for the Lambda function.|
|existingVpc?|[`ec2.IVpc`](https://docs.aws.amazon.com/cdk/api/latest/docs/@aws-cdk_aws-ec2.IVpc.html)|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()`](https://docs.aws.amazon.com/cdk/api/latest/docs/@aws-cdk_aws-ec2.Vpc.html#static-fromwbrlookupscope-id-options) method.|
|vpcProps?|[`ec2.VpcProps`](https://docs.aws.amazon.com/cdk/api/latest/docs/@aws-cdk_aws-ec2.VpcProps.html)|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 overrriden. 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:<ul><li> One isolated subnet in each Availability Zone used by the CDK program</li><li>`enableDnsHostnames` and `enableDnsSupport` will both be set to true</li></ul>If this property is `true` then `existingVpc` cannot be specified. Defaults to `false`.|

## Pattern Properties

| **Name**     | **Type**        | **Description** |
|:-------------|:----------------|-----------------|
|lambdaFunction|[`lambda.Function`](https://docs.aws.amazon.com/cdk/api/latest/docs/@aws-cdk_aws-lambda.Function.html)|Returns an instance of lambda.Function created by the construct|
|dynamoTable|[`dynamodb.Table`](https://docs.aws.amazon.com/cdk/api/latest/docs/@aws-cdk_aws-dynamodb.Table.html)|Returns an instance of dynamodb.Table created by the construct|
|vpc?|[`ec2.IVpc`](https://docs.aws.amazon.com/cdk/api/latest/docs/@aws-cdk_aws-ec2.IVpc.html)|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

![Architecture Diagram](architecture.png)

---


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