Go and Python SDK propagate correct storage class to keepstore
Keepclient code in Go and Python SDK support:
- Setting storage classes to use when uploading a block
- Passing storage classes in the X-Keep-Storage-Classes header
The client is responsible for keeping track of how many replicas have been written for each storage class. If one storage class is satisfied but not another, the satisfied one can be removed from the X-Keep-Storage-Classes list. The overall write is a success if all storage classes were satisfied, and a failure if any of the storage classes could not be satisfied.