AWS CDK で Event bus の DLQ を簡単に設定可能になりました

npm i aws-cdk-lib@latest aws-cdk@latest

import * as cdk from 'aws-cdk-lib';
import { Construct } from 'constructs';
import * as sqs from 'aws-cdk-lib/aws-sqs';
import * as events from 'aws-cdk-lib/aws-events';

export class SampleApp extends cdk.Stack {
  constructor(scope: Construct, id: string) {
    super(scope, id);

    const dlq = new sqs.Queue(this, 'DLQ');

    const bus = new events.EventBus(this, 'Bus', {
      deadLetterQueue: dlq, // DLQ を設定
    });

    new events.Rule(this, 'Rule', {
      eventBus: bus,
      eventPattern: {
        source: ['my.custom.source'],
      },
    });
  }
}

$ npx cdk diff
start: Building 96386930817c6798e83748f0fc7d6a7ddd3ffa58aee745d657107a8799c72906:current_account-current_region
success: Built 96386930817c6798e83748f0fc7d6a7ddd3ffa58aee745d657107a8799c72906:current_account-current_region
start: Publishing 96386930817c6798e83748f0fc7d6a7ddd3ffa58aee745d657107a8799c72906:current_account-current_region
success: Published 96386930817c6798e83748f0fc7d6a7ddd3ffa58aee745d657107a8799c72906:current_account-current_region
Hold on while we create a read-only change set to get a diff with accurate replacement information (use --no-change-set to use a less accurate but faster template-only diff)
Stack SampleApp
Resources
[~] AWS::Events::EventBus Bus BusEA82B648
 └─ [+] DeadLetterConfig
     └─ {"Arn":{"Fn::GetAtt":["DLQ581697C4","Arn"]}}

✨  Number of stacks with differences: 1

import * as cdk from 'aws-cdk-lib';
import { Construct } from 'constructs';
import * as sqs from 'aws-cdk-lib/aws-sqs';
import * as events from 'aws-cdk-lib/aws-events';
import * as kms from 'aws-cdk-lib/aws-kms';

export class SampleApp extends cdk.Stack {
  constructor(scope: Construct, id: string) {
    super(scope, id);

    const dlq = new sqs.Queue(this, 'DLQ');

    const kmsKey = new kms.Key(this, 'Key');

    const bus = new events.EventBus(this, 'Bus', {
      deadLetterQueue: dlq,
      kmsKey,
    });

    new events.Rule(this, 'Rule', {
      eventBus: bus,
      eventPattern: {
        source: ['my.custom.source'],
      },
    });
  }
}

aws kms disable-key --key-id $KMS_KEY_ID

[
  {
    "Source": "my.custom.source",
    "DetailType": "myDetailType",
    "Detail": "{ \"key1\": \"value1\" }"
  }
]

$ aws events put-events --entries file://event.json
{
    "FailedEntryCount": 1,
    "Entries": [
        {
            "ErrorCode": "KMSEncryptionException",
            "ErrorMessage": "arn:aws:kms:ap-northeast-1:XXXXXXXXXXXX:key/fc772eec-30c8-4c1c-ad80-7668e5b81308 is disabled."
        }
    ]
}

$ aws sqs receive-message --queue-url $DLQ_URL