# aws-sns-lambda module
<!--BEGIN STABILITY BANNER-->---
![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_sns_lambda`|
|![Typescript Logo](https://docs.aws.amazon.com/cdk/api/latest/img/typescript32.png) Typescript|`@aws-solutions-constructs/aws-sns-lambda`|
|![Java Logo](https://docs.aws.amazon.com/cdk/api/latest/img/java32.png) Java|`software.amazon.awsconstructs.services.snslambda`|
## Overview
This AWS Solutions Construct implements an Amazon SNS connected to an AWS Lambda function.
Here is a minimal deployable pattern definition:
Typescript
```python
import { Construct } from 'constructs';
import { Stack, StackProps } from 'aws-cdk-lib';
import { SnsToLambda, SnsToLambdaProps } from "@aws-solutions-constructs/aws-sns-lambda";
import * as lambda from 'aws-cdk-lib/aws-lambda';
new SnsToLambda(this, 'test-sns-lambda', {
lambdaFunctionProps: {
runtime: lambda.Runtime.NODEJS_16_X,
handler: 'index.handler',
code: lambda.Code.fromAsset(`lambda`)
}
});
```
Python
```python
from aws_solutions_constructs.aws_sns_lambda import SnsToLambda
from aws_cdk import (
aws_lambda as _lambda,
Stack
)
from constructs import Construct
SnsToLambda(self, 'test_sns_lambda',
lambda_function_props=_lambda.FunctionProps(
code=_lambda.Code.from_asset('lambda'),
runtime=_lambda.Runtime.PYTHON_3_9,
handler='index.handler'
)
)
```
Java
```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.snslambda.*;
new SnsToLambda(this, "test-lambda-sqs-stack", new SnsToLambdaProps.Builder()
.lambdaFunctionProps(new FunctionProps.Builder()
.runtime(Runtime.NODEJS_16_X)
.code(Code.fromAsset("lambda"))
.handler("index.handler")
.build())
.build());
```
## Pattern Construct Props
| **Name** | **Type** | **Description** |
|:-------------|:----------------|-----------------|
|existingLambdaObj?|[`lambda.Function`](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.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/v2/docs/aws-cdk-lib.aws_lambda.FunctionProps.html)|User provided props to override the default props for the Lambda function.|
|existingTopicObj?|[`sns.Topic`](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_lambda.Function.html)|Existing instance of SNS Topic object, providing both this and `topicProps` will cause an error.|
|topicProps?|[`sns.TopicProps`](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_sns.TopicProps.html)|Optional user provided properties to override the default properties for the SNS topic.|
|enableEncryptionWithCustomerManagedKey?|`boolean`|If no key is provided, this flag determines whether the SNS Topic is encrypted with a new CMK or an AWS managed key. This flag is ignored if any of the following are defined: topicProps.masterKey, encryptionKey or encryptionKeyProps.|
|encryptionKey?|[`kms.Key`](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_kms.Key.html)|An optional, imported encryption key to encrypt the SNS Topic with.|
|encryptionKeyProps?|[`kms.KeyProps`](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_kms.Key.html#construct-props)|Optional user provided properties to override the default properties for the KMS encryption key used to encrypt the SNS Topic with.|
## Pattern Properties
| **Name** | **Type** | **Description** |
|:-------------|:----------------|-----------------|
|lambdaFunction|[`lambda.Function`](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_lambda.Function.html)|Returns an instance of the Lambda function created by the pattern.|
|snsTopic|[`sns.Topic`](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_sns.Topic.html)|Returns an instance of the SNS topic created by the pattern.|
## Default settings
Out of the box implementation of the Construct without any override will set the following defaults:
### Amazon SNS Topic
* Configure least privilege access permissions for SNS Topic
* Enable server-side encryption for SNS Topic using AWS managed KMS Key
* Enforce encryption of data in transit
### 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)
## Architecture
![Architecture Diagram](architecture.png)
---
© Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
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"description": "# aws-sns-lambda module\n\n<!--BEGIN STABILITY BANNER-->---\n\n\n![Stability: Stable](https://img.shields.io/badge/cfn--resources-stable-success.svg?style=for-the-badge)\n\n---\n<!--END STABILITY BANNER-->\n\n| **Reference Documentation**:| <span style=\"font-weight: normal\">https://docs.aws.amazon.com/solutions/latest/constructs/</span>|\n|:-------------|:-------------|\n\n<div style=\"height:8px\"></div>\n\n| **Language** | **Package** |\n|:-------------|-----------------|\n|![Python Logo](https://docs.aws.amazon.com/cdk/api/latest/img/python32.png) Python|`aws_solutions_constructs.aws_sns_lambda`|\n|![Typescript Logo](https://docs.aws.amazon.com/cdk/api/latest/img/typescript32.png) Typescript|`@aws-solutions-constructs/aws-sns-lambda`|\n|![Java Logo](https://docs.aws.amazon.com/cdk/api/latest/img/java32.png) Java|`software.amazon.awsconstructs.services.snslambda`|\n\n## Overview\n\nThis AWS Solutions Construct implements an Amazon SNS connected to an AWS Lambda function.\n\nHere is a minimal deployable pattern definition:\n\nTypescript\n\n```python\nimport { Construct } from 'constructs';\nimport { Stack, StackProps } from 'aws-cdk-lib';\nimport { SnsToLambda, SnsToLambdaProps } from \"@aws-solutions-constructs/aws-sns-lambda\";\nimport * as lambda from 'aws-cdk-lib/aws-lambda';\n\nnew SnsToLambda(this, 'test-sns-lambda', {\n lambdaFunctionProps: {\n runtime: lambda.Runtime.NODEJS_16_X,\n handler: 'index.handler',\n code: lambda.Code.fromAsset(`lambda`)\n }\n});\n```\n\nPython\n\n```python\nfrom aws_solutions_constructs.aws_sns_lambda import SnsToLambda\nfrom aws_cdk import (\n aws_lambda as _lambda,\n Stack\n)\nfrom constructs import Construct\n\nSnsToLambda(self, 'test_sns_lambda',\n lambda_function_props=_lambda.FunctionProps(\n code=_lambda.Code.from_asset('lambda'),\n runtime=_lambda.Runtime.PYTHON_3_9,\n handler='index.handler'\n )\n )\n```\n\nJava\n\n```java\nimport software.constructs.Construct;\n\nimport software.amazon.awscdk.Stack;\nimport software.amazon.awscdk.StackProps;\nimport software.amazon.awscdk.services.lambda.*;\nimport software.amazon.awscdk.services.lambda.Runtime;\nimport software.amazon.awsconstructs.services.snslambda.*;\n\nnew SnsToLambda(this, \"test-lambda-sqs-stack\", new SnsToLambdaProps.Builder()\n .lambdaFunctionProps(new FunctionProps.Builder()\n .runtime(Runtime.NODEJS_16_X)\n .code(Code.fromAsset(\"lambda\"))\n .handler(\"index.handler\")\n .build())\n .build());\n```\n\n## Pattern Construct Props\n\n| **Name** | **Type** | **Description** |\n|:-------------|:----------------|-----------------|\n|existingLambdaObj?|[`lambda.Function`](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_lambda.Function.html)|Existing instance of Lambda Function object, providing both this and `lambdaFunctionProps` will cause an error.|\n|lambdaFunctionProps?|[`lambda.FunctionProps`](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_lambda.FunctionProps.html)|User provided props to override the default props for the Lambda function.|\n|existingTopicObj?|[`sns.Topic`](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_lambda.Function.html)|Existing instance of SNS Topic object, providing both this and `topicProps` will cause an error.|\n|topicProps?|[`sns.TopicProps`](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_sns.TopicProps.html)|Optional user provided properties to override the default properties for the SNS topic.|\n|enableEncryptionWithCustomerManagedKey?|`boolean`|If no key is provided, this flag determines whether the SNS Topic is encrypted with a new CMK or an AWS managed key. This flag is ignored if any of the following are defined: topicProps.masterKey, encryptionKey or encryptionKeyProps.|\n|encryptionKey?|[`kms.Key`](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_kms.Key.html)|An optional, imported encryption key to encrypt the SNS Topic with.|\n|encryptionKeyProps?|[`kms.KeyProps`](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_kms.Key.html#construct-props)|Optional user provided properties to override the default properties for the KMS encryption key used to encrypt the SNS Topic with.|\n\n## Pattern Properties\n\n| **Name** | **Type** | **Description** |\n|:-------------|:----------------|-----------------|\n|lambdaFunction|[`lambda.Function`](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_lambda.Function.html)|Returns an instance of the Lambda function created by the pattern.|\n|snsTopic|[`sns.Topic`](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_sns.Topic.html)|Returns an instance of the SNS topic created by the pattern.|\n\n## Default settings\n\nOut of the box implementation of the Construct without any override will set the following defaults:\n\n### Amazon SNS Topic\n\n* Configure least privilege access permissions for SNS Topic\n* Enable server-side encryption for SNS Topic using AWS managed KMS Key\n* Enforce encryption of data in transit\n\n### AWS Lambda Function\n\n* Configure limited privilege access IAM role for Lambda function\n* Enable reusing connections with Keep-Alive for NodeJs Lambda function\n* Enable X-Ray Tracing\n* Set Environment Variables\n\n * AWS_NODEJS_CONNECTION_REUSE_ENABLED (for Node 10.x and higher functions)\n\n## Architecture\n\n![Architecture Diagram](architecture.png)\n\n---\n\n\n\u00a9 Copyright Amazon.com, Inc. or its affiliates. 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