aws-cdk.aws-events-targets 1.108.1

Event targets for Amazon EventBridge

Event Targets for Amazon EventBridge

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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 and LogGroup 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.

# Example automatically generated without compilation. See https://github.com/aws/jsii/issues/826
import aws_cdk.aws_lambda as lambda_
import aws_cdk.aws_events as events
import aws_cdk.aws_sqs as sqs
import aws_cdk.aws_events_targets as targets
import aws_cdk.core as cdk

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

rule = events.Rule(self, "rule",
    event_pattern=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), # Otional: 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.

# Example automatically generated without compilation. See https://github.com/aws/jsii/issues/826
import aws_cdk.aws_logs as logs
import aws_cdk.aws_events as events
import aws_cdk.aws_events_targets as targets

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

rule = events.Rule(self, "rule",
    event_pattern=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.

# Example automatically generated without compilation. See https://github.com/aws/jsii/issues/826
import aws_sdk.aws_codebuild as codebuild
import aws_sdk.aws_codecommit as codecommit
import aws_sdk.aws_sqs as sqs
import aws_cdk.aws_events_targets as targets

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

# Example automatically generated without compilation. See https://github.com/aws/jsii/issues/826
import aws_sdk.aws_codepipeline as codepipeline
import aws_sdk.aws_sqs as sqs


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

rule = events.Rule(stack, "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.

# Example automatically generated without compilation. See https://github.com/aws/jsii/issues/826
import aws_sdk.aws_iam as iam
import aws_sdk.aws_sqs as sqs
import aws_cdk.aws_stepfunctions as sfn
import aws_cdk.aws_events_targets as targets

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

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

role = iam.Role(stack, "Role",
    assumed_by=iam.ServicePrincipal("events.amazonaws.com")
)
state_machine = sfn.StateMachine(stack, "SM",
    definition=sfn.Wait(stack, "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
))

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.

# Example automatically generated without compilation. See https://github.com/aws/jsii/issues/826
import aws_sdk.aws_iam as iam
import aws_sdk.aws_sqs as sqs
import aws_cdk.aws_apigateway as api
import aws_cdk.aws_events_targets as targets

rule = events.Rule(stack, "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(stack, "DeadLetterQueue")

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