aws-solutions-constructs.aws-lambda-step-function 1.115.0

CDK constructs for defining an interaction between an AWS Lambda function and an AWS Step Function.

aws-lambda-step-function module

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Some of our early constructs don’t meet the naming standards that evolved for the library. We are releasing completely feature compatible versions with corrected names. The underlying implementation code is the same regardless of whether you deploy the construct using the old or new name. We will support both names for all 1.x releases, but in 2.x we will only publish the correctly named constructs.

All classes are under active development and subject to non-backward compatible changes or removal in any future version. These are not subject to the Semantic Versioning model. This means that while you may use them, you may need to update your source code when upgrading to a newer version of this package.

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

Language	Package
Python	aws_solutions_constructs.aws_lambda_step_function
Typescript	@aws-solutions-constructs/aws-lambda-step-function
Java	software.amazon.awsconstructs.services.lambdastepfunction

This AWS Solutions Construct implements an AWS Lambda function connected to an AWS Step Function.

Here is a minimal deployable pattern definition in Typescript:

# Example automatically generated without compilation. See https://github.com/aws/jsii/issues/826
from aws_solutions_constructs.aws_lambda_step_function import LambdaToStepFunction
import aws_cdk.aws_stepfunctions as stepfunctions

start_state = stepfunctions.Pass(stack, "StartState")

LambdaToStepFunction(self, "LambdaToStepFunctionPattern",
    lambda_function_props=FunctionProps(
        runtime=lambda_.Runtime.NODEJS_12_X,
        handler="index.handler",
        code=lambda_.Code.from_asset(f"{__dirname}/lambda")
    ),
    state_machine_props=StateMachineProps(
        definition=start_state
    )
)

Initializer

new LambdaToStepFunction(scope: Construct, id: string, props: LambdaToStepFunctionProps);

Parameters

• scope Construct
• id string
• props LambdaToStepFunctionProps

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 Step Functions state machine environment variable set for the producer Lambda function.

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.

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 Function

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

Architecture

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