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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.
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 EventRule
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]]) -> EventRule
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'
}
});
0.22.0 (2019-01-10)
This is a major release with multiple breaking changes in the core layers. Please consult the breaking changes section below for details.
We are focusing these days on finalizing the common patterns and APIs of the CDK framework and the AWS Construct Library, which is why you are seeing all these breaking changes. Expect a few more releases with changes of that nature as we stabilize these APIs, so you might want to hold off with upgrading. We will communicate when this foundational work is complete.
export()
and import()
to share constructs between stacks, you can stop doing that, instead of FooImportProps
accept an IFoo
directly on the consuming stack, and use that object as usual.ArnUtils.fromComponents()
and ArnUtils.parse()
have been moved onto Stack
.AWS::AccountId
etc) are now also accessible via Stack
, as stack.accountId
etc.Fn
class (e.g. Fn.join(...)
instead of new FnJoin(...).toString()
)resolve()
has been moved to this.node.resolve()
.CloudFormationJSON.stringify()
has been moved to this.node.stringifyJson()
. validate()
now should be protected
.cloudformation.XxxResource
classes have been removed. Use the CfnXxx
classes instead.CfnXxx
resource attributes that represented a list of strings are now typed as string[]
s (via #1144). Attributes that represent strings, are still typed as string
(#712) and all other attribute types are represented as cdk.Token
.route53.TXTRecord
class was renamed to route53.TxtRecord
.zone
when created (not assuming zone is the parent construct).lambda.FunctionRef
to lambda.Function
.XxxRef
abstract classes are now IXxx
interfacesXxxRefProps
are now XxxImportProps
XxxRef.import(...)
are now Xxx.import(...)
accept XxxImportProps
and return IXxx
export(): XxxImportProps
is now defined in IXxx
and implemented by imported resourcesFAQs
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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