Originally, UpstreamMessageHandler was used by
controllerUpstreamMessageServiceServer.UpstreamMessage to process
(aka handle) an upstream message and by SendUpstreamMessage to
send an upstream msg.
We split UpstreamMessageHandler into two interfaces so we can
register handlers independently of a senders.
Define OSS protos for UpstreamMessageService rpc which defines a way
to send an upstream message to a controller (across multi-hops if
needed).
Implement OSS versions of both workers and controllers for the
UpstreamMessageService. The upstream requests/responses are encrypted
using the originating worker's NodeCredential's key.
The worker always forwards the request upstream.
The controller attends to find a registered UpstreamMessageHandler to
handle the msg; if none if found, then an Unimplemented status error
is returned.
Jim
Louis Ruch