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Description:

awscdk.awseventstargets 1.204.0

Event Targets for Amazon EventBridge
---

AWS CDK v1 has reached End-of-Support on 2023-06-01.
This package is no longer being updated, and users should migrate to AWS CDK v2.
For more information on how to migrate, see the Migrating to AWS CDK v2 guide.

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
Send an event to EventBridge API Destination

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_14_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)))
)

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

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 an 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_14_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
))

Invoke an API Destination
Use the targets.ApiDestination target to trigger an external API. You need to
create an events.Connection and events.ApiDestination as well.
The code snippet below creates an external destination that is invoked every hour.
connection = events.Connection(self, "Connection",
authorization=events.Authorization.api_key("x-api-key", SecretValue.secrets_manager("ApiSecretName")),
description="Connection with API Key x-api-key"
)

destination = events.ApiDestination(self, "Destination",
connection=connection,
endpoint="https://example.com",
description="Calling example.com with API key x-api-key"
)

rule = events.Rule(self, "Rule",
schedule=events.Schedule.rate(cdk.Duration.minutes(1)),
targets=[targets.ApiDestination(destination)]
)

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")))