AWS Cloudformation Lambda and Event Rule - Lambda not getting triggered with s3 event with a suffix?

Question

I have created a lambda and s3 event rule using cloudformation but lambda is not getting triggered as per configured rule. As per event rule I want lambda to trigger whenever a file is created in a specific s3 bucket with a specific suffix. Rule is given permission to invoke lambda. But when I upload a file (e.g. portfolio.testSuffix) lambda is not getting triggered.

  EventRule:
    Type: AWS::Events::Rule
    Properties:
      Description: 'test s3 event'
      EventPattern:
        source:
          - 'aws.s3'
        detail:
          eventSource:
            - 's3.amazonaws.com'
          eventName:
            - 'CopyObject'
            - 'PutObject'
          requestParameters:
            bucketName:
              - 'test-bucket'
            key:
              - |
               {"suffix": ".testsuffix"}
      State: 'ENABLED'
      Targets:
        -
          Arn: !GetAtt TestLambda.Arn
          Id: 'TestLambdaTargetId'
  LambdaInvokePermission:
    Type: AWS::Lambda::Permission
    Properties:
      Action: 'lambda:InvokeFunction'
      FunctionName: !GetAtt TestLambda.Arn
      Principal: 'events.amazonaws.com'
      SourceArn: !GetAtt EventRule.Arn

Can anyone help to identify what is wrong in this configuration and why lambda is not getting triggered ?

Ben Freiberg · Accepted Answer · 2025-03-24 13:14:45Z

4

As @Aris answers highlights, EventBridge does support suffix matching as well, as stated in the documentation.

Old answer from 2021

According to the Eventbridge documentation the suffix pattern is not supported.

key:
 - |
  {"suffix": ".testsuffix"}

Here's a list of all the comparison operators available in EventBridge:

Null, Empty, Equals, And, Or, Not, Numeric (equals), Numeric (range), Exists, Does not exist, Begins with

See Content-based filtering as well

edited Mar 24 at 13:14

answered Aug 24, 2021 at 20:35

Ben Freiberg

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Aris · Accepted Answer · 2022-11-15 06:14:26Z

3

It seems that support for suffix was recently added, based on the documentation.

Comparison	Example	Rule syntax
Ends with	FileName ends with a .png extension.	"FileName": [ { "suffix": ".png" } ]

reference: Content-based filtering

answered Nov 15, 2022 at 6:14

Aris

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