aws-lambda-ssmstringparameter

Language	Package
Python	aws_solutions_constructs.aws_lambda_ssm_string_parameter
Typescript	@aws-solutions-constructs/aws-lambda-ssmstringparameter
Java	software.amazon.awsconstructs.services.lambdassmstringparameter

Overview

This AWS Solutions Construct implements the AWS Lambda function and AWS Systems Manager Parameter Store String parameter with the least privileged permissions.

Here is a minimal deployable pattern definition:

Typescript

import { Construct } from 'constructs';
import { Stack, StackProps } from 'aws-cdk-lib';
import { LambdaToSsmstringparameterProps,  LambdaToSsmstringparameter } from '@aws-solutions-constructs/aws-lambda-ssmstringparameter';
import * as lambda from 'aws-cdk-lib/aws-lambda';

const constructProps: LambdaToSsmstringparameterProps = {
  lambdaFunctionProps: {
    runtime: lambda.Runtime.NODEJS_16_X,
    code: lambda.Code.fromAsset(`lambda`),
    handler: 'index.handler'
  },
  stringParameterProps: { stringValue: "test-string-value" }
};

new LambdaToSsmstringparameter(this, 'test-lambda-ssmstringparameter-stack', constructProps);

Python

from aws_solutions_constructs.aws_lambda_ssmstringparameter import LambdaToSsmstringparameter
from aws_cdk import (
    aws_lambda as _lambda,
    aws_ssm as ssm,
    Stack
)
from constructs import Construct

LambdaToSsmstringparameter(
    self, 'test-lambda-ssmstringparameter-stack',
    lambda_function_props=_lambda.FunctionProps(
        code=_lambda.Code.from_asset('lambda'),
        runtime=_lambda.Runtime.PYTHON_3_9,
        handler='index.handler'
    ),
    string_parameter_props=ssm.StringParameterProps(
        string_value="test-string-value")
)

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.awscdk.services.ssm.*;
import software.amazon.awsconstructs.services.lambdassmstringparameter.*;

new LambdaToSsmstringparameter(this, "test-lambda-ssmstringparameter-stack",
        new LambdaToSsmstringparameterProps.Builder()
                .lambdaFunctionProps(new FunctionProps.Builder()
                        .runtime(Runtime.NODEJS_16_X)
                        .code(Code.fromAsset("lambda"))
                        .handler("index.handler")
                        .build())
                .stringParameterProps(new StringParameterProps.Builder()
                        .stringValue("test-string-value")
                        .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	User provided props to override the default props for the Lambda function.
existingStringParameterObj?	ssm.StringParameter	Existing instance of SSM String parameter object, providing both this and stringParameterProps will cause an error
stringParameterProps?	ssm.StringParameterProps	Optional user provided props to override the default props for SSM String parameter. If existingStringParameterObj is not set stringParameterProps is required. The only supported ssm.StringParameterProps.type is STRING if a different value is provided it will be overridden.
stringParameterEnvironmentVariableName?	string	Optional Name for the Lambda function environment variable set to the name of the parameter. Default: SSM_STRING_PARAMETER_NAME
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 AWS Systems Manager Parameter. 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. enableDnsHostnames, enableDnsSupport, natGateways and subnetConfiguration are set by the pattern, so any values for those properties supplied here will be overridden. 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:
stringParameterPermissions	string	Optional SSM String parameter permissions to grant to the Lambda function. One of the following may be specified: "Read", "ReadWrite".

Pattern Properties

Name	Type	Description
lambdaFunction	lambda.Function	Returns an instance of lambda.Function created by the construct
stringParameter	ssm.StringParameter	Returns an instance of ssm.StringParameter created by the construct
vpc?	ec2.IVpc	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) SSM_STRING_PARAMETER_NAME

  • AWS_NODEJS_CONNECTION_REUSE_ENABLED (for Node 10.x and higher functions)

Amazon AWS Systems Manager Parameter Store String

• Enable read-only access for the associated AWS Lambda Function

• Creates a new SSM String parameter with the values provided

• Retain the SSM String parameter when deleting the CloudFormation stack

Architecture

GitHub

To view the code for this pattern, create/view issues and pull requests, and more:
	@aws-solutions-constructs/aws-lambda-ssmstringparameter