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Description:

awssolutionsconstructs.awslambdastepfunctions 2.70.0

aws-lambda-stepfunctions module
---

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

Language
Package

Python
aws_solutions_constructs.aws_lambda_stepfunctions

Typescript
@aws-solutions-constructs/aws-lambda-stepfunctions

Java
software.amazon.awsconstructs.services.lambdastepfunctions

Overview
This AWS Solutions Construct implements an AWS Lambda function connected to an AWS Step Functions.
Here is a minimal deployable pattern definition:
Typescript
import { Construct } from 'constructs';
import { Stack, StackProps } from 'aws-cdk-lib';
import { LambdaToStepfunctions } from '@aws-solutions-constructs/aws-lambda-stepfunctions';
import * as stepfunctions from 'aws-cdk-lib/aws-stepfunctions';
import * as lambda from 'aws-cdk-lib/aws-lambda';

const startState = new stepfunctions.Pass(this, 'StartState');

new LambdaToStepfunctions(this, 'LambdaToStepfunctionsPattern', {
lambdaFunctionProps: {
runtime: lambda.Runtime.NODEJS_16_X,
handler: 'index.handler',
code: lambda.Code.fromAsset(`lambda`)
},
stateMachineProps: {
definition: startState
}
});

Python
from aws_solutions_constructs.aws_lambda_stepfunctions import LambdaToStepfunctions
from aws_cdk import (
aws_lambda as _lambda,
aws_stepfunctions as stepfunctions,
Stack
)
from constructs import Construct

start_state = stepfunctions.Pass(self, 'start_state')

LambdaToStepfunctions(
self, 'test-lambda-stepfunctions-stack',
lambda_function_props=_lambda.FunctionProps(
code=_lambda.Code.from_asset('lambda'),
runtime=_lambda.Runtime.PYTHON_3_9,
handler='index.handler'
),
state_machine_props=stepfunctions.StateMachineProps(
definition=start_state)
)

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.stepfunctions.*;
import software.amazon.awsconstructs.services.lambdastepfunctions.*;

final Pass startState = new Pass(this, "StartState");

new LambdaToStepfunctions(this, "test-lambda-stepfunctions-stack",
new LambdaToStepfunctionsProps.Builder()
.lambdaFunctionProps(new FunctionProps.Builder()
.runtime(Runtime.NODEJS_16_X)
.code(Code.fromAsset("lambda"))
.handler("index.handler")
.build())
.stateMachineProps(new StateMachineProps.Builder()
.definition(startState)
.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.

stateMachineProps
sfn.StateMachineProps
User provided props for the sfn.StateMachine.

createCloudWatchAlarms
boolean
Whether to create recommended CloudWatch alarms

logGroupProps?
logs.LogGroupProps
User provided props to override the default props for for the CloudWatchLogs LogGroup.

stateMachineEnvironmentVariableName?
string
Optional Name for the Lambda function environment variable set to the ARN of the state machine. Default: STATE_MACHINE_ARN

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 Step Functions. 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: One isolated subnet in each Availability Zone used by the CDK programenableDnsHostnames and enableDnsSupport will both be set to trueIf this property is true then existingVpc cannot be specified. Defaults to false.

Pattern Properties

Name
Type
Description

lambdaFunction
lambda.Function
Returns an instance of the Lambda function created by the pattern.

stateMachine
sfn.StateMachine
Returns an instance of StateMachine created by the construct.

stateMachineLogGroup
logs.ILogGroup
Returns an instance of the ILogGroup created by the construct for StateMachine

cloudwatchAlarms?
cloudwatch.Alarm[]
Returns a list of alarms 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) STATE_MACHINE_ARN
AWS_NODEJS_CONNECTION_REUSE_ENABLED (for Node 10.x and higher functions)

AWS Step Functions

Enable CloudWatch logging for API Gateway
Deploy best practices CloudWatch Alarms for the Step Functions

Architecture

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