aws-cdk.aws-events-targets 1.138.1

Event targets for Amazon EventBridge

Event Targets for Amazon EventBridge

---

---

This library contains integration classes to send Amazon EventBridge to any number of supported AWS Services. Instances of these classes should be passed to the rule.addTarget() method.

Currently supported are:

• Start a CodeBuild build
• Start a CodePipeline pipeline
• Run an ECS task
• Invoke a Lambda function
• Invoke a API Gateway REST API
• Publish a message to an SNS topic
• Send a message to an SQS queue
• Start a StepFunctions state machine
• Queue a Batch job
• Make an AWS API call
• Put a record to a Kinesis stream
• Log an event into a LogGroup
• Put a record to a Kinesis Data Firehose stream
• Put an event on an EventBridge bus

See the README of the @aws-cdk/aws-events library for more information on EventBridge.

Event retry policy and using dead-letter queues

The Codebuild, CodePipeline, Lambda, StepFunctions, LogGroup and SQSQueue targets support attaching a dead letter queue and setting retry policies. See the lambda example. Use escape hatches for the other target types.

Invoke a Lambda function

Use the LambdaFunction target to invoke a lambda function.

The code snippet below creates an event rule with a Lambda function as a target triggered for every events from aws.ec2 source. You can optionally attach a dead letter queue.

import aws_cdk.aws_lambda as lambda_


fn = lambda_.Function(self, "MyFunc",
    runtime=lambda_.Runtime.NODEJS_12_X,
    handler="index.handler",
    code=lambda_.Code.from_inline("exports.handler = handler.toString()")
)

rule = events.Rule(self, "rule",
    event_pattern=events.EventPattern(
        source=["aws.ec2"]
    )
)

queue = sqs.Queue(self, "Queue")

rule.add_target(targets.LambdaFunction(fn,
    dead_letter_queue=queue,  # Optional: add a dead letter queue
    max_event_age=cdk.Duration.hours(2),  # Optional: set the maxEventAge retry policy
    retry_attempts=2
))

Log an event into a LogGroup

Use the LogGroup target to log your events in a CloudWatch LogGroup.

For example, the following code snippet creates an event rule with a CloudWatch LogGroup as a target. Every events sent from the aws.ec2 source will be sent to the CloudWatch LogGroup.

import aws_cdk.aws_logs as logs


log_group = logs.LogGroup(self, "MyLogGroup",
    log_group_name="MyLogGroup"
)

rule = events.Rule(self, "rule",
    event_pattern=events.EventPattern(
        source=["aws.ec2"]
    )
)

rule.add_target(targets.CloudWatchLogGroup(log_group))

Start a CodeBuild build

Use the CodeBuildProject target to trigger a CodeBuild project.

The code snippet below creates a CodeCommit repository that triggers a CodeBuild project on commit to the master branch. You can optionally attach a dead letter queue.

import aws_cdk.aws_codebuild as codebuild
import aws_cdk.aws_codecommit as codecommit


repo = codecommit.Repository(self, "MyRepo",
    repository_name="aws-cdk-codebuild-events"
)

project = codebuild.Project(self, "MyProject",
    source=codebuild.Source.code_commit(repository=repo)
)

dead_letter_queue = sqs.Queue(self, "DeadLetterQueue")

# trigger a build when a commit is pushed to the repo
on_commit_rule = repo.on_commit("OnCommit",
    target=targets.CodeBuildProject(project,
        dead_letter_queue=dead_letter_queue
    ),
    branches=["master"]
)

Start a CodePipeline pipeline

Use the CodePipeline target to trigger a CodePipeline pipeline.

The code snippet below creates a CodePipeline pipeline that is triggered every hour

import aws_cdk.aws_codepipeline as codepipeline


pipeline = codepipeline.Pipeline(self, "Pipeline")

rule = events.Rule(self, "Rule",
    schedule=events.Schedule.expression("rate(1 hour)")
)

rule.add_target(targets.CodePipeline(pipeline))

Start a StepFunctions state machine

Use the SfnStateMachine target to trigger a State Machine.

The code snippet below creates a Simple StateMachine that is triggered every minute with a dummy object as input. You can optionally attach a dead letter queue to the target.

import aws_cdk.aws_iam as iam
import aws_cdk.aws_stepfunctions as sfn


rule = events.Rule(self, "Rule",
    schedule=events.Schedule.rate(cdk.Duration.minutes(1))
)

dlq = sqs.Queue(self, "DeadLetterQueue")

role = iam.Role(self, "Role",
    assumed_by=iam.ServicePrincipal("events.amazonaws.com")
)
state_machine = sfn.StateMachine(self, "SM",
    definition=sfn.Wait(self, "Hello", time=sfn.WaitTime.duration(cdk.Duration.seconds(10))),
    role=role
)

rule.add_target(targets.SfnStateMachine(state_machine,
    input=events.RuleTargetInput.from_object({"SomeParam": "SomeValue"}),
    dead_letter_queue=dlq
))

Queue a Batch job

Use the BatchJob target to queue a Batch job.

The code snippet below creates a Simple JobQueue that is triggered every hour with a dummy object as input. You can optionally attach a dead letter queue to the target.

import aws_cdk.aws_batch as batch
from aws_cdk.aws_ecs import ContainerImage


job_queue = batch.JobQueue(self, "MyQueue",
    compute_environments=[batch.JobQueueComputeEnvironment(
        compute_environment=batch.ComputeEnvironment(self, "ComputeEnvironment",
            managed=False
        ),
        order=1
    )
    ]
)

job_definition = batch.JobDefinition(self, "MyJob",
    container=batch.JobDefinitionContainer(
        image=ContainerImage.from_registry("test-repo")
    )
)

queue = sqs.Queue(self, "Queue")

rule = events.Rule(self, "Rule",
    schedule=events.Schedule.rate(cdk.Duration.hours(1))
)

rule.add_target(targets.BatchJob(job_queue.job_queue_arn, job_queue, job_definition.job_definition_arn, job_definition,
    dead_letter_queue=queue,
    event=events.RuleTargetInput.from_object({"SomeParam": "SomeValue"}),
    retry_attempts=2,
    max_event_age=cdk.Duration.hours(2)
))

Invoke a API Gateway REST API

Use the ApiGateway target to trigger a REST API.

The code snippet below creates a Api Gateway REST API that is invoked every hour.

import aws_cdk.aws_apigateway as api
import aws_cdk.aws_lambda as lambda_


rule = events.Rule(self, "Rule",
    schedule=events.Schedule.rate(cdk.Duration.minutes(1))
)

fn = lambda_.Function(self, "MyFunc",
    handler="index.handler",
    runtime=lambda_.Runtime.NODEJS_12_X,
    code=lambda_.Code.from_inline("exports.handler = e => {}")
)

rest_api = api.LambdaRestApi(self, "MyRestAPI", handler=fn)

dlq = sqs.Queue(self, "DeadLetterQueue")

rule.add_target(
    targets.ApiGateway(rest_api,
        path="/*/test",
        method="GET",
        stage="prod",
        path_parameter_values=["path-value"],
        header_parameters={
            "Header1": "header1"
        },
        query_string_parameters={
            "QueryParam1": "query-param-1"
        },
        dead_letter_queue=dlq
    ))

Put an event on an EventBridge bus

Use the EventBus target to route event to a different EventBus.

The code snippet below creates the scheduled event rule that route events to an imported event bus.

rule = events.Rule(self, "Rule",
    schedule=events.Schedule.expression("rate(1 minute)")
)

rule.add_target(targets.EventBus(
    events.EventBus.from_event_bus_arn(self, "External", "arn:aws:events:eu-west-1:999999999999:event-bus/test-bus")))