aws-solutions-constructs.aws-lambda-elasticachememcached 2.38.0

CDK constructs for defining an interaction between an AWS Lambda function and an Amazon Elasticache memcached cache.

aws-lambda-elasticachememcached module

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

Language	Package
Python	aws_solutions_constructs.aws_lambda_elasticachememcached
Typescript	@aws-solutions-constructs/aws-lambda-elasticachememcached
Java	software.amazon.awsconstructs.services.lambdaelasticachememcached

Overview

This AWS Solutions Construct implements an AWS Lambda function connected to an Amazon Elasticache Memcached cluster.

Here is a minimal deployable pattern definition :

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_16_X,
        handler: 'index.handler',
        code: lambda.Code.fromAsset(`lambda`)
    }
});

Python

from aws_solutions_constructs.aws_lambda_elasticachememcached import LambdaToElasticachememcached
from aws_cdk import (
    aws_lambda as _lambda,
    Stack
)
from constructs import Construct

LambdaToElasticachememcached(self, 'LambdaToCachePattern',
        lambda_function_props=_lambda.FunctionProps(
            code=_lambda.Code.from_asset('lambda'),
            runtime=_lambda.Runtime.PYTHON_3_9,
            handler='index.handler'
        )
        )

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.lambdaelasticachememcached.*;

new LambdaToElasticachememcached(this, "LambdaToCachePattern", new LambdaToElasticachememcachedProps.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	Existing instance of Lambda Function object, providing both this and lambdaFunctionProps will cause an error.
lambdaFunctionProps?	lambda.FunctionProps	Optional user provided props to override the default props for the Lambda function.
existingVpc?	ec2.IVpc	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 Elasticache. 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() method.
vpcProps?	ec2.VpcProps	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	Optional Name for the Lambda function environment variable set to the cache endpoint. Default: CACHE_ENDPOINT
cacheProps?	cache.CfnCacheClusterProps	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	Existing instance of Elasticache Cluster object, providing both this and cacheProps will cause an error. If you provide this, you must provide the associated VPC in existingVpc.

Pattern Properties

Name	Type	Description
lambdaFunction	lambda.Function	Returns an instance of the Lambda function used by the pattern.
vpc	ec2.IVpc	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	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

  • 2 cache nodes, type: cache.t3.medium

• Self referencing security group attached to cluster endpoint

Architecture

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