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Event generating cloudwatch logs but not triggering lambda

0

New to aws, wrote a few lambda functions a few months ago that are triggered via external events sent to aws. Those are working fine. However, I created a few others in the past few days to accept other types of events. I get the cloudwatch logs but the lambda function does not appear to get executed.

Topics
ServerlessComputeApplication IntegrationManagement & Governance
Tags
AWS LambdaAmazon EventBridgeAmazon CloudWatch Logs
Language
English
isc
asked 9 months ago459 views
1 Answer
3
Accepted Answer

I assume you are trying to invoke lambda function through cloudwatch events. If so, then did you check, if resource permission has been added to lambda function for that newly created rule. Most of the cases, this gets missed and even if event would match, it won't be able to invoke lambda function.

For your reference, here is the cloudformation snippet, how you'd add lambda resource permissions for the event rule:

 rLambdaInvokePermission:
      Type: 'AWS::Lambda::Permission'
      Properties:
        FunctionName: !Ref myLambdaFunction
        Action: 'lambda:InvokeFunction'
        Principal: events.amazonaws.com
        SourceArn: !GetAtt rEventRule.Arn

Second thing, I'd check, if event pattern is matching exactly what's defined in event rule or not. You can do that by testing the event rule pattern and see if it matches or not.

Also, I'd suggest you to take a look at this re:Post thread, which talks in details about the same topic.

Hoe you find this information helpful.

Comment here if you have additional questions, happy to help.

Abhishek

profile pictureAWS
EXPERT
secondabhi_aws
answered 9 months ago
profile picture
EXPERT
Giovanni Lauria
reviewed 25 days ago
  • isc
    9 months ago

    I did it via the console/UI in Amazon EventBridge bus from an outside source and a rule with 2 targets, a lambda and a cloudwatch event log group. Before getting your post, I decided to delete everything: lambda/rule/log groups and start from scratch. Somehow seems to be working now which is great but unfortunately I have no idea what made it work. Below is the cloudformation snipet of in my eventbridge rule. I do no see anything for LambdaInvokePermission. Perhaps your snippet is applicable for a different type of event source?

    AWSTemplateFormatVersion: '2010-09-09'
Description: CloudFormation template for EventBridge rule 'scanner_v2'
Resources:
  EventRule0:
    Type: AWS::Events::Rule
    Properties:
      Description:  scanner
      EventBusName: aws.partner/0.com/mdgdev/mdgdev
      EventPattern:
        detail-type:
          - v2-beta.automationFileTransform.updated.status
        detail:
          transform:
            customTransformId:
              - app_xdooyCH7FU3Wjhq
            status:
              - RUNNING
      Name: scanner_v2
      State: ENABLED
      Targets:
        - Id: Id6f8f1e72-97fc-4b93-8752-d6f964807f9
          Arn: arn:aws:lambda:us-east-1:05785795513:function:scanner_v2
        - Id: Id704a5cef-e352-4ca4-a780-b5e7cc95bb1
          Arn: >-
            arn:aws:logs:us-east-1:0578555913:log-group:/aws/events/scanner_v2_log_only
  • secondabhi_aws EXPERT
    9 months ago

    I'm glad you got it worked out.

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