aws-eventbridge-stepfunctions

Reference Documentation:

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

Language	Package
Python	aws_solutions_constructs.aws_eventbridge_stepfunctions
Typescript	@aws-solutions-constructs/aws-eventbridge-stepfunctions
Java	software.amazon.awsconstructs.services.eventbridgestepfunctions

Overview

This AWS Solutions Construct implements an AWS Events rule and an AWS Step Functions State Machine

Here is a minimal deployable pattern definition:

Typescript

import { Construct } from 'constructs';
import { Stack, StackProps, Duration } from 'aws-cdk-lib';
import { EventbridgeToStepfunctions, EventbridgeToStepfunctionsProps } from '@aws-solutions-constructs/aws-eventbridge-stepfunctions';
import * as stepfunctions from 'aws-cdk-lib/aws-stepfunctions';
import * as events from 'aws-cdk-lib/aws-events';

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

const constructProps: EventbridgeToStepfunctionsProps = {
  stateMachineProps: {
    definition: startState
  },
  eventRuleProps: {
    schedule: events.Schedule.rate(Duration.minutes(5))
  }
};

new EventbridgeToStepfunctions(this, 'test-eventbridge-stepfunctions-stack', constructProps);

Python

from aws_solutions_constructs.aws_eventbridge_stepfunctions import EventbridgeToStepfunctions, EventbridgeToStepfunctionsProps
from aws_cdk import (
    aws_stepfunctions as stepfunctions,
    aws_events as events,
    Duration,
    Stack
)
from constructs import Construct

startState = stepfunctions.Pass(self, 'StartState')

EventbridgeToStepfunctions(self, 'test-eventbridge-stepfunctions-stack',
                            state_machine_props=stepfunctions.StateMachineProps(
                                definition=startState
                            ),
                            event_rule_props=events.RuleProps(
                                schedule=events.Schedule.rate(
                                    Duration.minutes(5))
                            ))

Java

import software.constructs.Construct;

import software.amazon.awscdk.Stack;
import software.amazon.awscdk.StackProps;
import software.amazon.awscdk.Duration;
import software.amazon.awscdk.services.events.*;
import software.amazon.awscdk.services.stepfunctions.*;
import software.amazon.awsconstructs.services.eventbridgestepfunctions.*;

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

new EventbridgeToStepfunctions(this,
        "test-eventbridge-stepfunctions-stack",
        new EventbridgeToStepfunctionsProps.Builder()
                .stateMachineProps(new StateMachineProps.Builder()
                        .definition(startState)
                        .build())
                .eventRuleProps(new RuleProps.Builder()
                        .schedule(Schedule.rate(Duration.minutes(5)))
                        .build())
                .build());

Pattern Construct Props

Name	Type	Description
stateMachineProps	sfn.StateMachineProps	User provided props for the sfn.StateMachine. This or existingStateMachine is required. If you provide a value for logs.destination, it must be an ILogGroup even though the prop type is ILogGroupRef. The CDK change to ILogGroupRef in v2.235.0 is incompatible with our interface without introducing breaking changes, so we still require an ILogGroup (as this implements ILogGroupRef, you can just assign it to logs.destination)
existingEventBusInterface?	events.IEventBus	Optional - user provided custom EventBus for this construct to use. Providing both this and eventBusProps causes an error.
eventBusProps?	events.EventBusProps	Optional - user provided properties to override the default properties when creating a custom EventBus. Setting this value to {} will create a custom EventBus using all default properties. If neither this nor existingEventBusInterface is provided the construct will use the default EventBus. Providing both this and existingEventBusInterface causes an error.
eventRuleProps	events.RuleProps	User provided eventRuleProps to override the defaults
createCloudWatchAlarms	boolean	Whether to create recommended CloudWatch alarms
logGroupProps?	logs.LogGroupProps	User provided props to override the default props for for the CloudWatchLogs LogGroup.

Pattern Properties

Name	Type	Description
eventBus?	events.IEventBus	Returns the instance of events.IEventBus used by the construct
eventsRule	events.Rule	Returns an instance of events.Rule created by the construct
stateMachine	sfn.StateMachine	Returns an instance of sfn.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 cloudwatch.Alarm created by the construct

Default settings

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

Amazon CloudWatch Events Rule

• Grant least privilege permissions to CloudWatch Events to trigger the Lambda Function

AWS Step Function

• Enable CloudWatch logging for API Gateway

• Deploy best practices CloudWatch Alarms for the Step Function

Architecture

Github

Go to the Github repo for this pattern to view the code, read/create issues and pull requests and more.