# aws-s3-lambda module
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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|`aws_solutions_constructs.aws_s3_lambda`|
| Typescript|`@aws-solutions-constructs/aws-s3-lambda`|
| Java|`software.amazon.awsconstructs.services.s3lambda`|
## Overview
This AWS Solutions Construct implements an Amazon S3 bucket 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 * as lambda from "aws-cdk-lib/aws-lambda";
import { S3ToLambdaProps, S3ToLambda } from '@aws-solutions-constructs/aws-s3-lambda';
new S3ToLambda(this, 'test-s3-lambda', {
lambdaFunctionProps: {
code: lambda.Code.fromAsset(`lambda`),
runtime: lambda.Runtime.NODEJS_16_X,
handler: 'index.handler'
},
});
```
Python
```python
from aws_solutions_constructs.aws_s3_lambda import S3ToLambda
from aws_cdk import (
aws_lambda as _lambda,
Stack
)
from constructs import Construct
S3ToLambda(self, 'test_s3_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.s3lambda.*;
new S3ToLambda(this, "test-s3-lambda'", new S3ToLambdaProps.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)|Optional user provided props to override the default props for the Lambda function.|
|existingBucketObj?|[`s3.Bucket`](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_s3.Bucket.html)|Existing instance of S3 Bucket object. If this is provided, then also providing bucketProps is an error. |
|bucketProps?|[`s3.BucketProps`](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_s3.BucketProps.html)|Optional user provided props to override the default props for the S3 Bucket.|
|s3EventSourceProps?|[`S3EventSourceProps`](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_lambda_event_sources.S3EventSourceProps.html)|Optional user provided props to override the default props for S3EventSourceProps|
|loggingBucketProps?|[`s3.BucketProps`](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_s3.BucketProps.html)|Optional user provided props to override the default props for the S3 Logging Bucket.|
|logS3AccessLogs?| boolean|Whether to turn on Access Logging for the S3 bucket. Creates an S3 bucket with associated storage costs for the logs. Enabling Access Logging is a best practice. default - true|
## 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 construct|
|s3Bucket?|[`s3.Bucket`](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_s3.Bucket.html)|Returns an instance of the s3.Bucket created by the construct|
|s3LoggingBucket?|[`s3.Bucket`](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_s3.Bucket.html)|Returns an instance of s3.Bucket created by the construct as the logging bucket for the primary bucket.|
|s3BucketInterface|[`s3.IBucket`](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_s3.IBucket.html)|Returns an instance of s3.IBucket created by the construct|
## Default settings
Out of the box implementation of the Construct without any override will set the following defaults:
### Amazon S3 Bucket
* Configure Access logging for S3 Bucket
* Enable server-side encryption for S3 Bucket using AWS managed KMS Key
* Enforce encryption of data in transit
* Turn on the versioning for S3 Bucket
* Don't allow public access for S3 Bucket
* Retain the S3 Bucket when deleting the CloudFormation stack
* Applies Lifecycle rule to move noncurrent object versions to Glacier storage after 90 days
### 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

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