feat(events): dead-letter queue support for CodeBuild

packages/@aws-cdk/aws-events-targets/README.md

@@ -89,3 +89,36 @@ const rule = new events.Rule(this, 'rule', {
 
 rule.addTarget(new targets.CloudWatchLogGroup(logGroup));
 ```
+
+## Trigger a CodeBuild project
+
+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](https://docs.aws.amazon.com/eventbridge/latest/userguide/rule-dlq.html).
+
+```ts
+import * as codebuild from '@aws-sdk/aws-codebuild';
+import * as codecommit from '@aws-sdk/aws-codecommit';
+import * as sqs from '@aws-sdk/aws-sqs';
+import * as targets from "@aws-cdk/aws-events-targets";
+
+const repo = new codecommit.Repository(this, 'MyRepo', {
+  repositoryName: 'aws-cdk-codebuild-events',
+});
+
+const project = new codebuild.Project(this, 'MyProject', {
+  source: codebuild.Source.codeCommit({ repository: repo }),
+});
+
+const deadLetterQueue = new sqs.Queue(this, 'DeadLetterQueue');
+
+// trigger a build when a commit is pushed to the repo
+const onCommitRule = repo.onCommit('OnCommit', {
+  target: new targets.CodeBuildProject(project, {
+    deadLetterQueue: deadLetterQueue,
+  }),
+  branches: ['master'],
+});
+```

packages/@aws-cdk/aws-events-targets/lib/codebuild.ts

@@ -1,7 +1,8 @@
 import * as codebuild from '@aws-cdk/aws-codebuild';
 import * as events from '@aws-cdk/aws-events';
 import * as iam from '@aws-cdk/aws-iam';
-import { singletonEventRole } from './util';
+import * as sqs from '@aws-cdk/aws-sqs';
+import { addToDeadLetterQueueResourcePolicy, singletonEventRole } from './util';
 
 /**
  * Customize the CodeBuild Event Target
@@ -24,6 +25,18 @@ export interface CodeBuildProjectProps {
    * @default - the entire EventBridge event
    */
   readonly event?: events.RuleTargetInput;
+
+  /**
+   * The SQS queue to be used as deadLetterQueue.
+   * Check out the [considerations for using a dead-letter queue](https://docs.aws.amazon.com/eventbridge/latest/userguide/rule-dlq.html#dlq-considerations).
+   *
+   * The events not successfully delivered are automatically retried for a specified period of time,
+   * depending on the retry policy of the target.
+   * If an event is not delivered before all retry attempts are exhausted, it will be sent to the dead letter queue.
+   *
+   * @default - no dead-letter queue
+   */
+  readonly deadLetterQueue?: sqs.IQueue;
 }
 
 /**
@@ -39,9 +52,15 @@ export class CodeBuildProject implements events.IRuleTarget {
    * Allows using build projects as event rule targets.
    */
   public bind(_rule: events.IRule, _id?: string): events.RuleTargetConfig {
+
+    if (this.props.deadLetterQueue) {
+      addToDeadLetterQueueResourcePolicy(_rule, this.props.deadLetterQueue);
+    }
+
     return {
       id: '',
       arn: this.project.projectArn,
+      deadLetterConfig: this.props.deadLetterQueue ? { arn: this.props.deadLetterQueue?.queueArn } : undefined,
       role: this.props.eventRole || singletonEventRole(this.project, [
         new iam.PolicyStatement({
           actions: ['codebuild:StartBuild'],

packages/@aws-cdk/aws-events-targets/test/codebuild/codebuild.test.ts

@@ -2,6 +2,7 @@ import { expect, haveResource } from '@aws-cdk/assert';
 import * as codebuild from '@aws-cdk/aws-codebuild';
 import * as events from '@aws-cdk/aws-events';
 import * as iam from '@aws-cdk/aws-iam';
+import * as sqs from '@aws-cdk/aws-sqs';
 import { CfnElement, Stack } from '@aws-cdk/core';
 import * as targets from '../../lib';
 
@@ -120,4 +121,84 @@ describe('CodeBuild event target', () => {
       ],
     }));
   });
+
+  test('use a Dead Letter Queue for the rule target', () => {
+    // GIVEN
+    const rule = new events.Rule(stack, 'Rule', {
+      schedule: events.Schedule.expression('rate(1 hour)'),
+    });
+
+    const queue = new sqs.Queue(stack, 'Queue');
+
+    // WHEN
+    const eventInput = {
+      buildspecOverride: 'buildspecs/hourly.yml',
+    };
+
+    rule.addTarget(
+      new targets.CodeBuildProject(project, {
+        event: events.RuleTargetInput.fromObject(eventInput),
+        deadLetterQueue: queue,
+      }),
+    );
+
+    // THEN
+    expect(stack).to(haveResource('AWS::Events::Rule', {
+      Targets: [
+        {
+          Arn: projectArn,
+          Id: 'Target0',
+          DeadLetterConfig: {
+            Arn: {
+              'Fn::GetAtt': [
+                'Queue4A7E3555',
+                'Arn',
+              ],
+            },
+          },
+          Input: JSON.stringify(eventInput),
+          RoleArn: {
+            'Fn::GetAtt': ['MyProjectEventsRole5B7D93F5', 'Arn'],
+          },
+        },
+      ],
+    }));
+
+    expect(stack).to(haveResource('AWS::SQS::QueuePolicy', {
+      PolicyDocument: {
+        Statement: [
+          {
+            Action: 'sqs:SendMessage',
+            Condition: {
+              ArnEquals: {
+                'aws:SourceArn': {
+                  'Fn::GetAtt': [
+                    'Rule4C995B7F',
+                    'Arn',
+                  ],
+                },
+              },
+            },
+            Effect: 'Allow',
+            Principal: {
+              Service: 'events.amazonaws.com',
+            },
+            Resource: {
+              'Fn::GetAtt': [
+                'Queue4A7E3555',
+                'Arn',
+              ],
+            },
+            Sid: 'AllowEventRuleRule',
+          },
+        ],
+        Version: '2012-10-17',
+      },
+      Queues: [
+        {
+          Ref: 'Queue4A7E3555',
+        },
+      ],
+    }));
+  });
 });

packages/@aws-cdk/aws-events-targets/test/codebuild/integ.project-events.expected.json

@@ -43,6 +43,14 @@
                 "Arn"
               ]
             },
+            "DeadLetterConfig": {
+              "Arn": {
+                "Fn::GetAtt": [
+                  "DeadLetterQueue9F481546",
+                  "Arn"
+                ]
+              }
+            },
             "Id": "Target0",
             "RoleArn": {
               "Fn::GetAtt": [
@@ -394,6 +402,50 @@
         }
       }
     },
+    "DeadLetterQueue9F481546": {
+      "Type": "AWS::SQS::Queue",
+      "UpdateReplacePolicy": "Delete",
+      "DeletionPolicy": "Delete"
+    },
+    "DeadLetterQueuePolicyB1FB890C": {
+      "Type": "AWS::SQS::QueuePolicy",
+      "Properties": {
+        "PolicyDocument": {
+          "Statement": [
+            {
+              "Action": "sqs:SendMessage",
+              "Condition": {
+                "ArnEquals": {
+                  "aws:SourceArn": {
+                    "Fn::GetAtt": [
+                      "MyRepoOnCommit0E80B304",
+                      "Arn"
+                    ]
+                  }
+                }
+              },
+              "Effect": "Allow",
+              "Principal": {
+                "Service": "events.amazonaws.com"
+              },
+              "Resource": {
+                "Fn::GetAtt": [
+                  "DeadLetterQueue9F481546",
+                  "Arn"
+                ]
+              },
+              "Sid": "AllowEventRuleawscdkcodebuildeventsMyRepoOnCommit0ED1137A"
+            }
+          ],
+          "Version": "2012-10-17"
+        },
+        "Queues": [
+          {
+            "Ref": "DeadLetterQueue9F481546"
+          }
+        ]
+      }
+    },
     "MyTopic86869434": {
       "Type": "AWS::SNS::Topic"
     },

packages/@aws-cdk/aws-events-targets/test/codebuild/integ.project-events.ts

@@ -20,6 +20,7 @@ const project = new codebuild.Project(stack, 'MyProject', {
 });
 
 const queue = new sqs.Queue(stack, 'MyQueue');
+const deadLetterQueue = new sqs.Queue(stack, 'DeadLetterQueue');
 
 const topic = new sns.Topic(stack, 'MyTopic');
 topic.addSubscription(new subs.SqsSubscription(queue));
@@ -39,7 +40,9 @@ project.onPhaseChange('PhaseChange', {
 
 // trigger a build when a commit is pushed to the repo
 const onCommitRule = repo.onCommit('OnCommit', {
-  target: new targets.CodeBuildProject(project),
+  target: new targets.CodeBuildProject(project, {
+    deadLetterQueue: deadLetterQueue,
+  }),
   branches: ['master'],
 });