feat(aws-lambda-elasticachmemcached): New Construct

source/patterns/@aws-solutions-constructs/aws-lambda-elasticachememcached/README.md

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+# aws-lambda-elasticachememcached module
+<!--BEGIN STABILITY BANNER-->
+
+---
+
+![Stability: Stable](https://img.shields.io/badge/cfn--resources-stable-success.svg?style=for-the-badge)
+
+---
+<!--END STABILITY BANNER-->
+
+| **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_elasticachememcached`|
+|![Typescript Logo](https://docs.aws.amazon.com/cdk/api/latest/img/typescript32.png) Typescript|`@aws-solutions-constructs/aws-lambda-elasticachememcached`|
+|![Java Logo](https://docs.aws.amazon.com/cdk/api/latest/img/java32.png) Java|`software.amazon.awsconstructs.services.lambdaelasticachememcached`|
+
+This AWS Solutions Construct implements an AWS Lambda function connected to an Amazon Elasticache Memcached cluster.
+
+Here is a minimal deployable pattern definition :
+
+Typescript
+``` typescript
+import { Construct } from 'constructs';
+import { Stack, StackProps } from 'aws-cdk-lib';
+import { LambdaToElasticachememcached } from '@aws-solutions-constructs/aws-lambda-elasticachememcached';
+import * as lambda from 'aws-cdk-lib/aws-lambda';
+
+new LambdaToElasticachememcached(this, 'LambdaToElasticachememcachedPattern', {
+    lambdaFunctionProps: {
+        runtime: lambda.Runtime.NODEJS_14_X,
+        handler: 'index.handler',
+        code: lambda.Code.fromAsset(`lambda`)
+    }
+});
+```
+
+Python
+```python
+
+```
+
+Java
+``` java
+
+```
+
+## 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)|Optional user provided props to override the default props 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 an Interface Endpoint will be created in the VPC for Amazon SQS. 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. `subnetConfiguration` is set by the pattern, so any values for those properties supplied here will be overrriden. |
+| cacheEndpointEnvironmentVariableName?| string | |
+| cacheProps? | [`cache.CfnCacheClusterProps`](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_elasticache.CfnCacheClusterProps.html) | Optional user provided props to override the default props for the Elasticache Cluster. Providing both this and `existingCache` will cause an error.' |
+| existingCache? | [`cache.CfnCacheCluster`](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_elasticache.CfnCacheCluster.html#attrconfigurationendpointport) | Existing instance of Elasticache Cluster object, providing both this and `cacheProps` will cause an error. |
+
+## 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 the Lambda function used by the pattern.|
+|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. This may be a VPC created by the pattern or the VPC supplied to the pattern constructor.|
+| cache | [`cache.CfnCacheCluster`](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_elasticache.CfnCacheCluster.html#attrconfigurationendpointport) | The Elasticache Memcached cluster used by the construct. |
+
+## 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
+* Attached to self referencing security group to grant access to cache
+* Set Environment Variables
+  * (default) CACHE_ENDPOINT
+  * AWS_NODEJS_CONNECTION_REUSE_ENABLED (for Node 10.x and higher functions)
+
+### Amazon Elasticache Memcached Cluster
+* Creates multi node, cross-az cluster by default
+* Self referencing security group attached to cluster endpoint
+
+## Architecture
+![Architecture Diagram](architecture.png)
+
+***
+&copy; Copyright 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.