aws-solutions-constructs.aws-events-rule-step-function 1.181.1

CDK Constructs for deploying AWS Events Rule that invokes AWS Step Function

aws-events-rule-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. This construct is being replaced by the functionally identical aws-eventbridge-stepfunctions.

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

Language	Package
Python	aws_solutions_constructs.aws_events_rule_step_function
Typescript	@aws-solutions-constructs/aws-events-rule-step-function
Java	software.amazon.awsconstructs.services.eventsrulestepfunction

Overview

This AWS Solutions Construct implements an AWS Events rule and an AWS Step function.

Here is a minimal deployable pattern definition:

Typescript

// aws-events-rule-step-function has been deprecated for CDK V2 in favor of aws-eventbridge-stepfunctions.
// This sample uses the CDK V1 syntax
import * as cdk from '@aws-cdk/core';
import * as events from '@aws-cdk/aws-events';
import * as stepfunctions from '@aws-cdk/aws-stepfunctions';
import { EventsRuleToStepFunction, EventsRuleToStepFunctionProps } from '@aws-solutions-constructs/aws-events-rule-step-function';

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

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

new EventsRuleToStepFunction(this, 'test-events-rules-step-function-stack', constructProps);

Python

# aws-events-rule-step-function has been deprecated for CDK V2 in favor of aws-eventbridge-stepfunctions.
# This sample uses the CDK V1 syntax
from aws_solutions_constructs.aws_events_rule_step_function import EventsRuleToStepFunction, EventsRuleToStepFunctionProps
from aws_cdk import (
    aws_stepfunctions as stepfunctions,
    aws_events as events,
    core
)

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

EventsRuleToStepFunction(self, 'test',
                            state_machine_props=stepfunctions.StateMachineProps(
                                definition=startState
                            ),
                            event_rule_props=events.RuleProps(
                                schedule=events.Schedule.rate(
                                    core.Duration.minutes(5))
                            ))

Java

// aws-events-rule-step-function has been deprecated for CDK V2 in favor of aws-eventbridge-stepfunctions.
// This sample uses the CDK V1 syntax
import software.constructs.Construct;

import software.amazon.awscdk.core.*;
import software.amazon.awscdk.services.events.*;
import software.amazon.awscdk.services.stepfunctions.*;
import software.amazon.awsconstructs.services.eventsrulestepfunction.*;

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

new EventsRuleToStepFunction(this,
        "test-eventbridge-stepfunctions-stack",
        new EventsRuleToStepFunctionProps.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	Optional user provided props to override the default props for sfn.StateMachine
existingEventBusInterface?	events.IEventBus	Optional user-provided custom EventBus for construct to use. Providing both this and eventBusProps results 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 results 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

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