Instead of endpoints being a flat list, it is now a list of "subsets"
where each is a struct of {Addresses, Ports}. To generate the list of
endpoints you need to take union of the Cartesian products of the
subsets. This is compact in the vast majority of cases, yet still
represents named ports and corner cases (e.g. each pod has a different
port number).
This also stores subsets in a deterministic order (sorted by hash) to
avoid spurious updates and comparison problems.
This is a fully compatible change - old objects and clients will
keepworking as long as they don't need the new functionality.
This is the prep for multi-port Services, which will add API to produce
endpoints in this new structure.
As per discussion with @snmarterclayton. I implemented this for most
types in the "obvious" way. I am not sure how to implement
this for a couple types, though.
Dependency chain is now api -> api/rest -> apiserver. Makes the
interfaces much cleaner to read, and cleans up some inconsistenties
that crept in along the way.
Also make sure all POST operations return 201 by default.
Removes the remainder of the asych logic in RESTStorage and
leaves it up to the API server to expose that behavior.
PUT allows an object to be created (http 201). This allows REST code to
indicate an object has been created and clients to react to it.
APIServer now deals with <-chan RESTResult instead of <-chan runtime.Object,
allowing more data to be passed through.
Allows us to define different watch versioning regimes in the future
as well as to encode information with the resource version.
This changes /watch/resources?resourceVersion=3 to start the watch at
4 instead of 3, which means clients can read a resource version and
then send it back to the server. Clients should no longer do math on
resource versions.
