(events rule): Event pattern is not valid. Reason: suffix match pattern must be a string

[phmello20]

Describe the bug

Match.suffix method seems to be generating an invalid event patter

Here's the example:

const searchIndexRule = new events.Rule(this, id, {
    eventPattern: {
      detail: {
        matchPrefix: events.Match.prefix('created'),
        matchSuffix: events.Match.suffix('created'),
      },
    },
    eventBus,
    enabled,
  });

Once the code is deployed the result is the following:

{
    "Rules": [
        {
            "Name": "----",
            "Arn": "----",
            "EventPattern": "{\"detail\": {\"matchPrefix\": [{\"prefix\": \"created:\"}], \"matchSuffix\": [{\"suffix\": [\":created\"]}]}}",
            "State": "ENABLED",
        }
    ]
}

prefix works fine and the result is {"prefix": "created"} however, suffix is invalid as the result is {"suffix":["created"]}

Regression Issue

• Select this option if this issue appears to be a regression.

Last Known Working CDK Version

No response

Expected Behavior

the event patter should be {"suffix":"created"}

Current Behavior

the event pattern is {"suffix":["created"]}

Reproduction Steps

cdk deploy

Possible Solution

No response

Additional Information/Context

No response

CDK CLI Version

2.172.0

Framework Version

No response

Node.js Version

v20.12.2

OS

Mac OS 14.6.1

Language

TypeScript

Language Version

5.6.3

Other information

No response

[nmussy]

I'm not able to reproduce the issue in your example, would you be able to provide a complete reproducible code sample?

const app = new cdk.App();
const stack = new cdk.Stack(app, 'Stack');
const eventBus = new EventBus(stack, 'EventBus');
new Rule(stack, 'Rule', {
  eventPattern: {
    detail: {
      matchPrefix: m.prefix('created'),
      matchSuffix: m.suffix('created'),
    },
  },
  eventBus,
});

Template.fromStack(stack).hasResourceProperties('AWS::Events::Rule', {
  'EventPattern': {
    'detail': {
      matchPrefix: [{ 'prefix': 'created' }],
      matchSuffix: [{ 'suffix': 'created' }],
    },
  },
  'State': 'ENABLED',
});

EDIT: I misread your expected result, sorry about that

[khushail]

Hi @phmello20 , thanks for reaching out.

Here is the sample code for reproducing the issue -

    const eventBus = new events.EventBus(this, 'EventBus');

    const searchIndexRule = new events.Rule(this, id, {
      eventPattern: {
        detail: {
          matchPrefix: events.Match.prefix('created'),
          matchSuffix: events.Match.suffix('created'),
        },
      },
      eventBus,
      enabled: true,
    });

and the synthesized template -

"EventIssueStackE5385CAB": {
   "Type": "AWS::Events::Rule",
   "Properties": {
    "EventBusName": {
     "Ref": "EventBus7B8748AA"
    },
    "EventPattern": {
     "detail": {
      "matchPrefix": [
       {
        "prefix": "created"
       }
      ],
      "matchSuffix": [
       {
        "suffix": "created"
       }
      ]
     }
    },
    "State": "ENABLED"
   },

which seems as expected.

is there anything being missed in the code ? Would request you to share insights on how this issue could be reproduced.

Thanks

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[phmello20]

hey @khushail, thanks for your response, I'll try again and I'll let you know shortly

[github-actions]

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