[pipelines] how to add notifications to a CDK pipeline? or: expose underlying CodePipeline object

As far as I can tell, there is no way with the current CDK pipeline API to add codestarnotifications to the underlying CodePipeline, because there is no way to get the ARN of the CodePipeline.

The CdkPipeline has a private variable that holds the reference to the CodePipeline, but we can’t access it. I imagine that it would be useful for developers to have access to this for many other reasons as well.

Use Case

There is no way to set up notifications for a CDK pipeline.

Proposed Solution

Change CdkPipeline private readonly _pipeline member variable to public.

Other

• 👋 I may be able to implement this feature request
• ⚠️ This feature might incur a breaking change

---

This is a 🚀 Feature Request

[wilhen01]

You can get codestar notifications working with CDK pipelines using the below code snippet. pipeline.codePipeline exposes the underlying CodePipeline object.

import * as pipelines from '@aws-cdk/pipelines';
import { DetailType, NotificationRule } from '@aws-cdk/aws-codestarnotifications';
import { Topic } from '@aws-cdk/aws-sns';
import { Construct, Fn, Stack, StackProps } from '@aws-cdk/core';

const pipeline = new pipelines.CdkPipeline(this, 'Deployer', {
      cloudAssemblyArtifact,
      sourceAction,
      synthAction,
    });
    
const slackNotificationTopicArn = Fn.importValue(Exports.SlackStatusNotificationsTopic);
const targetTopic = Topic.fromTopicArn(this, 'topic', slackNotificationTopicArn);

new NotificationRule(this, 'Notification', {
      detailType: DetailType.BASIC,
      events: ['codepipeline-pipeline-pipeline-execution-failed'],
      source: pipeline.codePipeline,
      targets: [targetTopic],
    });

[federicobarera]

@TomaszSzusterTR

EDIT 2:

Adding pipeline.buildPipeline() between the CodePipeline and the Notification creates the notification correctly.

import {
  CodePipeline,
} from '@aws-cdk/pipelines';

const pipeline = new CodePipeline(this, 'Pipeline', {
      synth,
      pipelineName: stackName
    });

pipeline.buildPipeline()

const rule = new NotificationRule(this, 'Notification', {
      detailType: DetailType.BASIC,
      events: [
        'codepipeline-pipeline-pipeline-execution-started',
        'codepipeline-pipeline-pipeline-execution-failed',
        'codepipeline-pipeline-pipeline-execution-succeeded'
      ],
      source: pipeline.pipeline,
      targets: [targetTopic]
    });