stack/get-outputs assumes same region

[markusbk]

The function stack/get-outputs has no way to override which endpoint to use, and assumes you will only retrieve outputs for stacks in the same region. However, as CloudFormation can be used to maintain cross-region resources (e.g., Route 53 record sets or S3 buckets), it's useful to be able to retrieve outputs from stacks in other regions.

Amazonica lets you override the endpoint for each API call, so by replacing

(cf/describe-stacks :stack-name stack-name)

with

(cf/describe-stacks {:endpoint endpoint} :stack-name stack-name)

you can get stack outputs for a stack in a different region. endpoint could be an optional parameter to get-outputs.