Book Image

.Go Programming Blueprints - Second Edition

By : Mat Ryer
Book Image

.Go Programming Blueprints - Second Edition

By: Mat Ryer

Overview of this book

Go is the language of the Internet age, and the latest version of Go comes with major architectural changes. Implementation of the language, runtime, and libraries has changed significantly. The compiler and runtime are now written entirely in Go. The garbage collector is now concurrent and provides dramatically lower pause times by running in parallel with other Go routines when possible. This book will show you how to leverage all the latest features and much more. This book shows you how to build powerful systems and drops you into real-world situations. You will learn to develop high quality command-line tools that utilize the powerful shell capabilities and perform well using Go's in-built concurrency mechanisms. Scale, performance, and high availability lie at the heart of our projects, and the lessons learned throughout this book will arm you with everything you need to build world-class solutions. You will get a feel for app deployment using Docker and Google App Engine. Each project could form the basis of a start-up, which means they are directly applicable to modern software markets.
Table of Contents (19 chapters)
Go Programming Blueprints Second Edition
About the Author
About the Reviewer

A gRPC server in Go kit

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 ( 
  grpctransport "" 
type grpcServer struct { 
  hash     grpctransport.Handler 
  validate grpctransport.Handler 
func (s *grpcServer) Hash(ctx context.Context,
 r *pb.HashRequest) (*pb.HashResponse, error) { 
  _, resp...