Book Image

gRPC Go for Professionals

By : Clément Jean
Book Image

gRPC Go for Professionals

By: Clément Jean

Overview of this book

In recent years, the popularity of microservice architecture has surged, bringing forth a new set of requirements. Among these, efficient communication between the different services takes center stage, and that's where gRPC shines. This book will take you through creating gRPC servers and clients in an efficient, secure, and scalable way. However, communication is just one aspect of microservices, so this book goes beyond that to show you how to deploy your application on Kubernetes and configure other tools that are needed for making your application more resilient. With these tools at your disposal, you’ll be ready to get started with using gRPC in a microservice architecture. In gRPC Go for Professionals, you'll explore core concepts such as message transmission and the role of Protobuf in serialization and deserialization. Through a step-by-step implementation of a TODO list API, you’ll see the different features of gRPC in action. You’ll then learn different approaches for testing your services and debugging your API endpoints. Finally, you’ll get to grips with deploying the application services via Docker images and Kubernetes.
Table of Contents (13 chapters)
10
Epilogue

Authenticating requests

In this section and the following, we are going to simplify the middleware that we currently have. First, we are going to start by simplifying the authentication process. We saw in the previous chapter that we can easily create an interceptor for checking an authentication token in headers. In this section, we are going to take a step further and make it even simpler.

Important note

gRPC supports retrying authentication of requests through an RBAC policy without a third-party library. However, the configuration is quite verbose and not very well documented. If you are interested in trying it, you can check the following example: https://github.com/grpc/grpc-go/blob/master/examples/features/authz/README.md.

Previously, when we wrote our interceptors, we needed to create the following function for a unary interceptor:

func unaryAuthInterceptor(ctx context.Context, req
  interface{}, info *grpc.UnaryServerInfo, handler
   &...