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

Project description

aws-lambda-step-function module

---

Stability: Experimental

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 This means that while you may use them, you may need to update your source code when upgrading to a newer version of this package.


Reference Documentation: https://docs.aws.amazon.com/solutions/latest/constructs/
Language Package
Python Logo Python aws_solutions_constructs.aws_lambda_step_function
Typescript Logo Typescript @aws-solutions-constructs/aws-lambda-step-function
Java Logo 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

Pattern Construct Props

Name Type Description
existingLambdaObj? lambda.Function Existing instance of Lambda Function object, if this is set then the lambdaFunctionProps is ignored.
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.LogGroup Returns an instance of the LogGroup 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

Architecture Diagram


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