Allow to pass parameter value for 'Enabled' property in ScheduledEvent of 'AWS::Serverless::Function'

[jeswanthamazon]

When you reference a parameter for 'Enabled' property in ScheduledEvent of 'AWS::Serverless::Function', it is not honoring the parameter value passed and setting the "State": "ENABLED" for Events::Rule in the processed template.

'Enabled' property in ScheduledEvent of 'AWS::Serverless::Function' currently only accepts 'true' or 'false' bool values hard-coded as string in template.

in the background when composing the processed template, 'AWS::Serverless-2016-10-31' transform sees:

• if 'Enabled' property is set in the ScheduledEvent,
• if it is set, 'State' Is set to 'DISABLED' only if the 'Enabled' property is 'False'. If it is anything else, 'State' Is set to 'ENABLED'. You can reference the transform code here: https://github.com/awslabs/serverless-application-model/blob/93b6ac0afb6f322e047d6e4c4887f0d829e54b88/samtranslator/model/eventsources/push.py#L113

Currently Serverless transform is not capable of reading the parameter value to set the 'State' of Event::Rule.

Please add support to parse the parameter value and set the 'State' property value to 'DISABLED' /'Enabled' accordingly.

[SydneyUni-Jim]

This is related to #1360

[praneetap]

Thanks for the issue report! We have passed this along to our product team for possible prioritization. Please +1 on the feature to help with prioritization.

[RichieRunner]

It has been 10 months, when is this going to be fixed? Even Enabled: False doesn't even work anymore.

[jwalsh2me]

@jfuss is this still under review?

[RichieRunner]

this is such a shame. you have a core feature broken, and nobody who's paid to work on it even cares.

[z0ph]

Same issue here, lost a few hours on troubleshooting this...

[RichieRunner]

Since it's abundantly clear now that AWS and the maintainers of this codebase are refusing to prioritize this to be a critical bug, what is everyone's recommendation for disabling the Enabled flag if you are building resources in NP?

I am trying to achieve this kind of conditional logic:

[z0ph]

Since it's abundantly clear now that AWS and the maintainers of this codebase are refusing to prioritize this to be a critical bug, what is everyone's recommendation for disabling the Enabled flag if you are building resources in NP?

I am trying to achieve this kind of conditional logic:

Same here, what do you think @RichieRunner if we switch to the standard CloudFormation template (not SAM), should it be fine?

[jwalsh2me]

That was the same conditional logic I had tried. @victor

On Fri, Nov 27, 2020 at 1:36 AM Victor GRENU [email protected] wrote:

Since it's abundantly clear now that AWS and the maintainers of this codebase are refusing to prioritize this to be a critical bug, what is everyone's recommendation for disabling the Enabled flag if you are building resources in NP?

I am trying to achieve this kind of conditional logic: [image: image] https://user-images.githubusercontent.com/20289967/100397949-496e5480-3001-11eb-8c2a-8b8bdcf572b8.png

Same here, what do you think @RichieRunner https://github.com/RichieRunner if we switch to the standard CloudFormation template (not SAM), should it be fine?

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[awsjeffg]

@RichieRunner @z0ph @jwalsh2me thanks for bumping this issue and discussing workarounds. I've just now added this to the backlog internally, and I apologize that we struggle with communicating status on issues like this where there are internal and external trackers involved.

Is there a workaround people have found for this particular issue? I was hoping for some cases like this that SAM CLI's recent addition of environments would help, but I can see why it fails here.

[jewelsjacobs]

A workaround would be much appreciated. I'm running into the same issue using the same Condition logic.

[z0ph]

Hi there,

Do you think we can apply similar logic to the parent lambda event source?

I don't know where we can set this up in SAM. Any clues ?

[jewelsjacobs]

FWIW, I have a bash script function workaround. It will remove the lambda CloudWatch Event rule trigger and disable the rule itself for SAM rules with the default serverlessrepo*. names. It should be easy to add parameters / variables to.

I can't find an AWS CLI way to just disable a CloudWatch Event in the Lambda so I remove it.

https://gist.github.com/jewelsjacobs/2ea1b37dd4db5279d038111e77d9d813

[RichieRunner]

FWIW, I have a bash script function workaround. It will remove the lambda CloudWatch Event rule trigger and disable the rule itself for SAM rules with the default serverlessrepo*. names. It should be easy to add parameters / variables to.

I can't find an AWS CLI way to just disable a CloudWatch Event in the Lambda so I remove it.

https://gist.github.com/jewelsjacobs/2ea1b37dd4db5279d038111e77d9d813

Thanks, so...you just run this as a last step in every build? 😖

[jewelsjacobs]

Thanks, so...you just run this as a last step in every build? 😖

Pretty much @RichieRunner 😞

[diegogurpegui]

+1 waiting for a fix

[victor]

@jwalsh2me I don't know what you're talking about

[nbrational]

I could work around this by adding a separate resource for AWS::Events::Rule and excluded 'Events' property from AWS::Serverless::Function. Example template:-

Transform: AWS::Serverless-2016-10-31
Description: >
  sam-app

  Sample SAM Template for sam-app

Globals:
  Function:
    Timeout: 3

Parameters:
  RuleEnabled:
    Description: ENABLED or DISABLED
    Default: ENABLED
    Type: String
    # AllowedValues: [True, False]

Resources:
  HelloWorldFunction:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: hello_world/
      Handler: app.lambda_handler
      Runtime: python2.7
      # Events:
        # HelloWorld:
        #   Type: Api # More info about API Event Source: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#api
        #   Properties:
        #     Path: /hello
        #     Method: get
        # ScheduledEvent:
        #   Type: Schedule
        #   Properties:
        #     Schedule: cron(30 3 * * ? *)
        #     Description: Execute the application as batch (Run at 9:00 am (UTC) every day)
        #     Enabled: !Ref RuleEnabled

  HelloWorldFunctionScheduledEvent:
    Type: AWS::Events::Rule
    Properties:
      State: !Ref RuleEnabled
      ScheduleExpression: cron(30 3 * * ? *)
      Description: Execute the application as batch (Run at 9:00 am (UTC) every day)
      Targets:
      - Id: HelloWorldFunctionScheduledEventLambdaTarget
        Arn:
          Fn::GetAtt:
          - HelloWorldFunction
          - Arn

[RichieRunner]

I could work around this by adding a separate resource for AWS::Events::Rule and excluded 'Events' property from AWS::Serverless::Function. Example template:-

Ahh, that's smart! This is worth a try as well, thanks!

[z0ph]

I could work around this by adding a separate resource for AWS::Events::Rule and excluded 'Events' property from AWS::Serverless::Function. Example template:-

It's working as a workaround. Thanks @nbrational

[forzagreen]

I could work around this by adding a separate resource for AWS::Events::Rule and excluded 'Events' property from AWS::Serverless::Function. Example template:-

Thank you @nbrational for the workaround.

I think you also have to grant Events the permission to invoke the lambda, using AWS::Lambda::Permission resource :

  HelloWorldFunctionLambdaPermission:
    Type: AWS::Lambda::Permission
    Properties:
      Action: lambda:InvokeFunction
      FunctionName: !GetAtt HelloWorldFunction.Arn
      Principal: events.amazonaws.com
      SourceArn: !GetAtt HelloWorldFunctionScheduledEvent.Arn

[RichieRunner]

Closing in on the 2 year mark with still no fix from the SAM team on this 🎉

[jfalkenstein]

Could we please get some attention on this?

[jfuss]

Hey all, I am moving through our backlog of PRs and this PR (https://github.com/aws/serverless-application-model/pull/1666) was looking to address this.

I am in the middle of updating it but realized a couple things, if you are using Intrinsic Functions as the value, this will break because SAM expects "true" or "false" while the underlying CFN resource uses "enabled" or "disabled".

SAM's history with intrinsic functions are hit or miss. Mostly due to us needing to re-implement how CloudFormation handles these, as there is no library provided by CloudFormation. Instead of going down that path (which has a bunch of flaws/concerns), I am thinking about adding a new property that will be a passthrough to the underlying CloudFormation resource directly. This would require customers to change their templates but existing ones would behave the same and people running into issues (as described here) could be unblocked.

Looking for some thoughts from the community on this.

[jwalsh2me]

I like the idea of a new property!