GCP/GCPD - A gRPC implementation of scp

A simple secure file copy implementation in gRPC.

How it works

Reference/Summary of 4 types gRPC implementations

Proto	Client side	Server side
rpc FUNC(TYPE1) returns (TYPE2) {};	obvious	obvious
rpc FUNC(stream TYPE1) returns (TYPE2) {};	stream.Recv() &&	stream.Send(TYPE1) &&
	stream.SendAndClose(TYPE2)	stream.CloseAndRecv()
rpc FUNC(TYPE1) returns (stream TYPE2) {};	stream.Send(TYPE2)	stream.Recv() && EOF
rpc FUNC(stream TYPE1) returns (stream TYPE2) {};	stream.Recv() && EOF	stream.Recv() && EOF &&
	stream.Send(TYPE2)	stream.Send(TYPE1) && stream.CloseSend()