convert response struct to specific object type?

[rjhornsby]

I've got some Terraform code, but no state file. I'm working to match up the TF declared resources with existing AWS resources. More or less, I'm doing this with the Ruby SDK:

rds_client = Aws::RDS::Client.new(region: 'us-west-2', profile: 'credential-profile')
instances = rds_client.describe_db_instances

The response is a struct, but not an object of type AWS::RDS::DBInstance. Is it possible to easily take an arbitrary response struct and convert it to a specific (ie RDS::DBInstance) object class? Or more specifically, within the struct is the pagination marker and an array of hashes that contain the db instance metadata.

Part of the issue I'm running into with the struct is writing code that handles different AWS resource types somewhat generically. The RDS::DBInstance class has an id method, but the struct requires you to know that the property is db_instance_identifier - which will be different for every AWS resource type.

Alternatively, is there a data file somewhere that maps AWS resources, for example for AWS::RDS::DBInstance, the struct key pointing at the array of data is db_instances and the id property is db_instance_identifier I've tried looking at the SDK code, but nothing jumps out at me as being obvious and at least a little generic so I can use the same general approach for EC2 instances, RDS, etc. thanks!

[mullermp]

Thanks for opening up a discussion. Aws::RDS::DBInstance is a "resource" class, instantiated from a Resource client. You can use resource_client = Aws::RDS::Resource.new and resource_client.db_instances to call describe_db_instances and it will return an instance of Aws::RDS::DBInstance. You can also construct it manually using the result of describe_db_instances by iterating instances in db_instances and passing :data and :id:

          batch = []
          page.data.db_instances.each do |d|
            batch << DBInstance.new(
              id: d.db_instance_identifier,
              data: d,
              client: @client
            )
          end