keep a pool of connections open when dialing for drpc. this
makes it so that long lived clients (like lib/uplink's Project)
don't continue to use a bad connection forever. it also allows
for concurrent rpcs.
Change-Id: If649b286050e4f09c413fadc3e1ce88f5fc6e600
we spawned a goroutine to wait on the context's done
channel sending the error afterward, but we forgot
to ensure the context was eventually done, so the
goroutine would be leaked until then.
instead, we can just do a select on two channels to
get the error rather than spawn a goroutine which
makes it impossible to leak a goroutine.
Change-Id: I2fdba206ae6ff7a3441b00708b86b36dfeece2b5
It provides an abstraction around the rpc details so that one
can use dprc or gprc with the same code. It subsumes using the
protobuf package directly for client interfaces as well as
the pkg/transport package to perform dials.
Change-Id: I8f5688bd71be8b0c766f13029128a77e5d46320b
