There is no use running function callLambda() two times:

1. In init at

   aws-lambda-developer-guide/sample-apps/blank-go/function/main.go

   Line 18 in a930cb3

   callLambda()

2. In separate call under handleRequest with error handling:

   aws-lambda-developer-guide/sample-apps/blank-go/function/main.go

   Line 48 in a930cb3

   usage, err := callLambda()

Since it does exactly the same (retrieves settings from GetAccountSettings API), no need to run it two times.

As we might want to have values of those settings before running actual Lambda functionality, perhaps it makes sense leaving them under init but removing from handleRequest. As init function does not return anything, maybe it would make sense to send callLambda error to log like this:

func init() {
  _, err := callLambda()
  if err != nil {
    log.Printf("ERROR calling GetAccountSettings API: %s", err)
  }
}

What do you think? If such change makes sense, I will create pull request.