# aws-eventbridge-stepfunctions module
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| **Reference Documentation**:| <span style="font-weight: normal">https://docs.aws.amazon.com/solutions/latest/constructs/</span>|
|:-------------|:-------------|
<div style="height:8px"></div>
| **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
```python
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
```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
```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`](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_stepfunctions.StateMachineProps.html)|Optional user provided props to override the default props for sfn.StateMachine|
|existingEventBusInterface?|[`events.IEventBus`](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_events.IEventBus.html)| Optional user-provided custom EventBus for construct to use. Providing both this and `eventBusProps` results an error.|
|eventBusProps?|[`events.EventBusProps`](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_events.EventBusProps.html)|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`](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_events.RuleProps.html)|User provided eventRuleProps to override the defaults|
|createCloudWatchAlarms|`boolean`|Whether to create recommended CloudWatch alarms|
|logGroupProps?|[`logs.LogGroupProps`](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_logs.LogGroupProps.html)|User provided props to override the default props for for the CloudWatchLogs LogGroup.|
## Pattern Properties
| **Name** | **Type** | **Description** |
|:-------------|:----------------|-----------------|
|eventBus?|[`events.IEventBus`](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_events.IEventBus.html)|Returns the instance of events.IEventBus used by the construct|
|eventsRule|[`events.Rule`](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_events.Rule.html)|Returns an instance of events.Rule created by the construct|
|stateMachine|[`sfn.StateMachine`](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_stepfunctions.StateMachine.html)|Returns an instance of sfn.StateMachine created by the construct|
|stateMachineLogGroup|[`logs.ILogGroup`](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_logs.ILogGroup.html)|Returns an instance of the ILogGroup created by the construct for StateMachine|
|cloudwatchAlarms?|[`cloudwatch.Alarm[]`](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_cloudwatch.Alarm.html)|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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