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@aws-cdk/aws-events
Advanced tools
@aws-cdk/aws-events is an AWS Cloud Development Kit (CDK) library that allows you to define and manage Amazon EventBridge resources using code. EventBridge is a serverless event bus that makes it easier to build event-driven applications by connecting application data from your own applications, integrated Software-as-a-Service (SaaS) applications, and AWS services.
Creating an Event Bus
This code sample demonstrates how to create a new EventBridge event bus using the AWS CDK. The event bus can be used to receive and route events.
const events = require('@aws-cdk/aws-events');
const cdk = require('@aws-cdk/core');
const app = new cdk.App();
const stack = new cdk.Stack(app, 'EventBusStack');
const eventBus = new events.EventBus(stack, 'MyEventBus', {
eventBusName: 'my-event-bus'
});
app.synth();
Creating a Rule
This code sample demonstrates how to create an EventBridge rule that triggers when an EC2 instance changes state to 'running'. The rule targets a Lambda function.
const events = require('@aws-cdk/aws-events');
const targets = require('@aws-cdk/aws-events-targets');
const cdk = require('@aws-cdk/core');
const app = new cdk.App();
const stack = new cdk.Stack(app, 'EventRuleStack');
const rule = new events.Rule(stack, 'MyRule', {
eventPattern: {
source: ['aws.ec2'],
detailType: ['EC2 Instance State-change Notification'],
detail: {
state: ['running']
}
}
});
rule.addTarget(new targets.LambdaFunction(myLambdaFunction));
app.synth();
Scheduling Events
This code sample demonstrates how to create a scheduled EventBridge rule that triggers every 5 minutes. The rule targets a Lambda function.
const events = require('@aws-cdk/aws-events');
const targets = require('@aws-cdk/aws-events-targets');
const cdk = require('@aws-cdk/core');
const app = new cdk.App();
const stack = new cdk.Stack(app, 'ScheduledEventStack');
const rule = new events.Rule(stack, 'MyScheduledRule', {
schedule: events.Schedule.rate(cdk.Duration.minutes(5))
});
rule.addTarget(new targets.LambdaFunction(myLambdaFunction));
app.synth();
The aws-sdk package is the official AWS SDK for JavaScript, which provides a comprehensive set of tools for interacting with AWS services, including EventBridge. Unlike @aws-cdk/aws-events, which is used for defining infrastructure as code, aws-sdk is used for making API calls to AWS services.
The serverless framework is a popular open-source framework for building and deploying serverless applications. It supports AWS Lambda and EventBridge, among other services. While @aws-cdk/aws-events focuses on infrastructure as code, serverless provides a higher-level abstraction for deploying serverless applications.
Pulumi is an infrastructure as code tool that supports multiple cloud providers, including AWS. It allows you to define and manage cloud resources using familiar programming languages. Pulumi can be used to manage EventBridge resources similarly to @aws-cdk/aws-events, but it offers a different approach and supports multiple clouds.
This API is still under active development and subject to non-backward compatible changes or removal in any future version. Use of the API is not recommended in production environments. Experimental APIs are not subject to the Semantic Versioning model.
Amazon CloudWatch Events delivers a near real-time stream of system events that describe changes in AWS resources. For example, an AWS CodePipeline emits the State Change event when the pipeline changes it's state.
The Rule
construct defines a CloudWatch events rule which monitors an
event based on an event
pattern
and invoke event targets when the pattern is matched against a triggered
event. Event targets are objects that implement the IEventTarget
interface.
Normally, you will use one of the source.onXxx(name[, target[, options]]) -> Rule
methods on the event source to define an event rule associated with
the specific activity. You can targets either via props, or add targets using
rule.addTarget
.
For example, to define an rule that triggers a CodeBuild project build when a commit is pushed to the "master" branch of a CodeCommit repository:
const onCommitRule = repo.onCommit('OnCommitToMaster', project, 'master');
You can add additional targets, with optional input
transformer
using eventRule.addTarget(target[, input])
. For example, we can add a SNS
topic target which formats a human-readable message for the commit.
For example, this adds an SNS topic as a target:
onCommitRule.addTarget(topic, {
template: 'A commit was pushed to the repository <repo> on branch <branch>',
pathsMap: {
branch: '$.detail.referenceName',
repo: '$.detail.repositoryName'
}
});
The @aws-cdk/aws-events-targets
module includes classes that implement the IRuleTarget
interface for various AWS services.
The following targets are supported:
targets.SnsTopic
: publish into an SNS topic when an event rule is triggered.targets.CodeBuildProject
: start a CodeBuild project when an event rule is triggered.targets.LambdaFunction
: invoke an AWS Lambda function when an event rule is triggered.0.34.0 (2019-06-07)
aws-cloudwatch-actions
(#2688) (e3df21a)recordValue: string
prop in route53.TxtRecord
changed to values: string[]
recordValue
prop in route53.CnameRecord
renamed to domainName
route53.AliasRecord
has been removed, use route53.ARecord
or route53.AaaaRecord
with the target
prop.EncryptionKeyAlias
class was renamed to Alias
.
Associated types (such as EncryptionKeyAliasProps
) were renamed in the
same way.App.run()
was renamed to App.synth()
(soft deprecation, it will be removed in the next release).node.stack
is now Stack.of(construct)
(fixes #2766)node.resolve
has been moved to stack.resolve
.node.stringifyJson
has been moved to stack.stringifyJson
.node.validateTree
is now ConstructNode.validate(node)
node.prepareTree
is now ConstructNode.prepare(node)
node.getContext
is now node.tryGetContext
node.recordReference
is now node.addReference
node.apply
is now node.applyAspect
node.ancestors()
is now node.scopes
node.required
has been removed.node.typename
has been removed.node.addChild
is now privatenode.findReferences()
is now node.references
node.findDependencies()
is now node.dependencies
stack.dependencies()
is now stack.dependencies
CfnElement.stackPath
has been removed.CloudFormationLang
is now internal (use stack.toJsonString()
)@aws-cdk/aws-cloudwatch-actions
package.targets.EcsEc2Task
renamed to targets.EcsTask
endpoint
is now type string
(previously any
)result
in the Pass state is now type map
(previously any
)@aws-cdk/applet-js
, @aws-cdk/aws-autoscaling-api
, @aws-cdk/aws-codedeploy-api
addPropertyOverride
should match in capitalization to the CloudFormation schema (normally pascal case). For example, addPropertyOverride('accessControl', 'xxx')
should now be addPropertyOverride('AccessControl', 'xxx')
.rds.RotationSingleUser
renamed to rds.SecretRotation
rds.ClusterParameterGroup
no longer has setParameter()
and removeParameter()
methods, use the parameters prop directly in the constructor instead.FAQs
Amazon EventBridge Construct Library
The npm package @aws-cdk/aws-events receives a total of 184,407 weekly downloads. As such, @aws-cdk/aws-events popularity was classified as popular.
We found that @aws-cdk/aws-events demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 4 open source maintainers collaborating on the project.
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