We pass in a callback using the ttrpc.WithOnClose functionality
for shims that use ttrpc, but with the newly added ability to use
GRPC for shims this was left as a follow-up. It doesn't seem like
grpc-go has anything similar so some options (that I could see) are:
This change introduces a new grpcConn wrapper type for the connection
that exposes a method to get notified when the users callback has run,
the same in functionality as TTRPC's `UserOnCloseWait`. The callback
gets passed in in a new `grpcDialContext` function that will:
1. Dial the connection as normal
2. Spin off a goroutine that will monitor the connections state
until it transitions to idle or shutdown and will then run the
callback.
Signed-off-by: Danny Canter <danny@dcantah.dev>
4278fbbc7e