This handler will be used primarily in a loop to iterate over multiple EC2 image instances. In order to be used by the Loop handler, a single value is returned as an escaped XML string. called "Instance List".
The Instance List will have the following format: ari-fe916297 ari-8b779ae2 ari-926b8bfb
To setup the Loop handler, refer to the Image List from this handler for 'Data Source' and use '/images/image'as the 'Variable Path'.
The describe_images function is the base AWS::EC2 gem call we are using for this handler and returns a multi-level hash/array nest with a top level hash key of "imagesSet".
The imagesSet has the following pseudo-xml form. Elements with the - tag are array members and are referenced by numerical index.
All others are hash members and are references by element/key name.
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To retrieve the imageId, for example, simply flatten the above structure by removing inapplicable items
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Treat items as arrays and all other members as hash keys. Doing so, we can reference imageId value in the following manner:
@baseawsobject.imagesSet.item[index].imageId