How to Create a gRPC Server in Go

Create a gRPC server in Go by defining a proto service, generating Go code, and running a server that listens on a TCP port.

package main

import (
	"context"
	"log"
	"net"

	"google.golang.org/grpc"
)

type server struct {
	unimplementedServiceServer
}

func (s *server) Method(ctx context.Context, req *Request) (*Response, error) {
	return &Response{Message: "Hello"}, nil
}

func main() {
	lis, err := net.Listen("tcp", ":50051")
	if err != nil {
		log.Fatalf("failed to listen: %v", err)
	}
	s := grpc.NewServer()
	RegisterServiceServer(s, &server{})
	log.Fatal(s.Serve(lis))
}

1. Define your service and methods in a .proto file.
2. Generate Go code by running protoc --go_out=. --go-grpc_out=. your_file.proto.
3. Implement the generated server interface in your Go code.
4. Create a new gRPC server with grpc.NewServer() and register your service.
5. Start listening on a port with s.Serve(lis).

gRPC is a way for different computer programs to talk to each other quickly and efficiently. You define a contract for how they communicate, generate the necessary code, and then run a server that waits for requests. It's like setting up a specialized phone line where both sides agree on exactly what words to use before the call starts.