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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.

주제
서버리스컴퓨팅애플리케이션 통합관리 및 거버넌스
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AWS Lambda아마존 EventBridge아마존 CloudWatch 로그
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English
isc
질문됨 9달 전507회 조회
1개 답변
3
수락된 답변

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

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전문가
secondabhi_aws
답변함 9달 전
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전문가
Giovanni Lauria
검토됨 한 달 전
  • isc
    9달 전

    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 전문가
    9달 전

    I'm glad you got it worked out.

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