aws-solutions-constructs.aws-fargate-stepfunctions 2.68.0

CDK Constructs for AWS Fargate to Amazon Step Functions integration

aws-fargate-stepfunctions module

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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 This means that while you may use them, you may need to update your source code when upgrading to a newer version of this package.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_fargate_stepfunctions
Typescript	@aws-solutions-constructs/aws-fargate-stepfunctions
Java	software.amazon.awsconstructs.services.fargatestepfunctions

Overview

This AWS Solutions Construct implements an AWS Fargate service that can execute an AWS Step Functions state machine

Here is a minimal deployable pattern definition:

Typescript

import { Construct } from 'constructs';
import { Stack, StackProps } from 'aws-cdk-lib';
import { FargateToStepfunctions, FargateToStepfunctionsProps } from '@aws-solutions-constructs/aws-fargate-stepfunctions';
import * as stepfunctions from 'aws-cdk-lib/aws-stepfunctions';

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

const constructProps: FargateToStepfunctionsProps = {
  publicApi: true,
  ecrRepositoryArn: "arn:aws:ecr:us-east-1:123456789012:repository/your-ecr-repo",
  stateMachineProps: {
      definition: startState
    }
};

new FargateToStepfunctions(this, 'test-construct', constructProps);

Python

from aws_solutions_constructs.aws_fargate_stepfunctions import FargateToStepfunctions, FargateToStepfunctionsProps
from aws_cdk import (
    aws_stepfunctions as stepfunctions,
    Stack
)
from constructs import Construct

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

FargateToStepfunctions(self, 'test_construct',
            public_api=True,
            ecr_repository_arn="arn:aws:ecr:us-east-1:123456789012:repository/your-ecr-repo",
            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.awsconstructs.services.fargatestepfunctions.*;
import software.amazon.awscdk.services.stepfunctions.*;

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

new FargateToStepfunctions(this, "test-construct", new FargateToStepfunctionsProps.Builder()
        .publicApi(true)
        .ecrRepositoryArn("arn:aws:ecr:us-east-1:123456789012:repository/your-ecr-repo")
        .stateMachineProps(new StateMachineProps.Builder()
                        .definition(startState)
                        .build()
        .build());

Pattern Construct Props

Name	Type	Description
publicApi	boolean	Whether the construct is deploying a private or public API. This has implications for the VPC.
vpcProps?	ec2.VpcProps	Optional custom properties for a VPC the construct will create. This VPC will be used by any Private Hosted Zone the construct creates (that's why loadBalancerProps and privateHostedZoneProps can't include a VPC). Providing both this and existingVpc is an error.
existingVpc?	ec2.IVpc	An existing VPC in which to deploy the construct. Providing both this and vpcProps is an error. If the client provides an existing load balancer and/or existing Private Hosted Zone, those constructs must exist in this VPC.
clusterProps?	ecs.ClusterProps	Optional properties to create a new ECS cluster. To provide an existing cluster, use the cluster attribute of fargateServiceProps.
ecrRepositoryArn?	string	The arn of an ECR Repository containing the image to use to generate the containers. Either this or the image property of containerDefinitionProps must be provided. format: arn:aws:ecr:region:account number:repository/Repository Name
ecrImageVersion?	string	The version of the image to use from the repository. Defaults to 'Latest'
containerDefinitionProps?	ecs.ContainerDefinitionProps | any	Optional props to define the container created for the Fargate Service (defaults found in fargate-defaults.ts)
fargateTaskDefinitionProps?	ecs.FargateTaskDefinitionProps | any	Optional props to define the Fargate Task Definition for this construct (defaults found in fargate-defaults.ts)
fargateServiceProps?	ecs.FargateServiceProps | any	Optional values to override default Fargate Task definition properties (fargate-defaults.ts). The construct will default to launching the service is the most isolated subnets available (precedence: Isolated, Private and Public). Override those and other defaults here.
existingFargateServiceObject?	ecs.FargateService	A Fargate Service already instantiated (probably by another Solutions Construct). If this is specified, then no props defining a new service can be provided, including: ecrImageVersion, containerDefinitionProps, fargateTaskDefinitionProps, ecrRepositoryArn, fargateServiceProps, clusterProps
existingContainerDefinitionObject?	ecs.ContainerDefinition	A container definition already instantiated as part of a Fargate service. This must be the container in the existingFargateServiceObject
stateMachineProps	sfn.StateMachineProps	User provided props to override the default props for sfn.StateMachine.
createCloudWatchAlarms?	boolean	Whether to create recommended CloudWatch alarms. Default is true.
logGroupProps?	logs.LogGroupProps	Optional user provided props to override the default props for for the CloudWatchLogs LogGroup.
stateMachineEnvironmentVariableName?	string	Optional Name for the container environment variable set to the ARN of the state machine. Default: STATE_MACHINE_ARN

Pattern Properties

Name	Type	Description
vpc	ec2.IVpc	The VPC used by the construct (whether created by the construct or provided by the client)
service	ecs.FargateService	The AWS Fargate service used by this construct (whether created by this construct or passed to this construct at initialization)
container	ecs.ContainerDefinition	The container associated with the AWS Fargate service in the service property.
stateMachine	sfn.StateMachine	Returns an instance of sfn.StateMachine created by the construct.
stateMachineLogGroup	logs.ILogGroup	Returns an instance of the logs.ILogGroup created by the construct for StateMachine.
cloudwatchAlarms?	cloudwatch.Alarm[]	Returns a list of cloudwatch.Alarm created by the construct.

Default settings

Out of the box implementation of the Construct without any override will set the following defaults:

AWS Fargate Service

• Sets up an AWS Fargate service

  • Uses the existing service if provided

  • Creates a new service if none provided.

    • Service will run in isolated subnets if available, then private subnets if available and finally public subnets

• Adds an environment variable to the container containing the ARN of the state machine

  • Default name is STATE_MACHINE_ARN

• Add permissions to the container IAM role allowing it to start the execution of a state machine

AWS Step Functions

• Sets up an AWS Step Functions state machine

  • Uses an existing state machine if one is provided, otherwise creates a new one

• Adds an Interface Endpoint to the VPC for Step Functions (the service by default runs in Isolated or Private subnets)

• Enables CloudWatch logging

Architecture

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