Adding a gPRC server using Go kit is almost as easy as adding a JSON/HTTP server, like we did in the last section. In our generated code (in the pb folder), we were given the following pb.VaultServer type:
type VaultServer interface {
Hash(context.Context, *HashRequest)
(*HashResponse, error)
Validate(context.Context, *ValidateRequest)
(*ValidateResponse, error)
}
This type is very similar to our own Service interface, except that it takes in generated request and response classes rather than raw arguments.
We'll start by defining a type that will implement the preceding interface. Add the following code to a new file called server_grpc.go:
package vault
import (
"golang.org/x/net/context"
grpctransport "github.com/go-kit/kit/transport/grpc"
)
type grpcServer struct {
hash grpctransport.Handler
validate grpctransport.Handler
}
func (s *grpcServer) Hash(ctx context.Context,
r *pb.HashRequest) (*pb.HashResponse, error) {
_, resp...