contains placeholder within quotes error AWS Cloudwatch rule

user_9829034 0
Viewed 1090

I am trying to use an AWS Cloudwatch rule that runs a powershell script on a EC2 Instance using SSM. The script works when I hard code the instance ID in the command section of the RunPowerShellScript Document. But when I use the same command in the Input Transformer to get the Instanceid as a variable from the Cloudwatch event I get the following error:

"There was an error while saving rule DisableInAD. Details: InputTemplate for target Id111111 contains placeholder within quotes.."

The input Command I am trying to use is: {"commands":["C:\\users \\documents\\Disable_Single_Instance -Id <instance>"]}

amazon-web-services
2 Answers

I asked AWS about this and was told that this is a known limitation of Cloudwatch Events Input Transformer. They suggested creating a Lambda to use as the target as you are able to pass parameters that way. Then the lambda could potentially invoke the SSM command.

user_3722970

One workaround is to escape the quotes

e.g.:

InputPathsMap

{"pipeline":"$.detail.pipeline","state":"$.detail.state"}

InputTemplate

"{\"message\":\"<pipeline> - <state>\"}"

In cloud formation:

InputTransformer:
  InputPathsMap: 
    pipeline: "$.detail.pipeline"
    state: "$.detail.state"
  InputTemplate: '"{\"message\":\"<pipeline> - <state>\"}"'

You will get the result as a quoted string (not JSON) e.g.

"\"{\\\"message\\\":\\\"TestPipleline - SUCCEEDED\\\"}\""

so you will have double parse the result to get the proper JSON.

user_17341430
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