ryutah / step-by-step-go-grpc

step-by-step-go-grpc

step-by-step-go-grpc

Step 1. Download and set PATH protoc

ここ から protoc を DL してインストール！

My Recommand

use asdf and install protoc.

asdf plugin-add protoc https://github.com/paxosglobal/asdf-protoc.git
asdf install protoc latest

Warning インストールできるバージョンが最新じゃない。(適当に PR 出そうと思って忘れてた)

Step 2. Install Go protoco buffer pliugin

go install google.golang.org/protobuf/cmd/protoc-gen-go@v1.28
go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@v1.2

Step 3. Define proto file

helloworld.proto

syntax = "proto3";

option go_package = "github.com/ryutah/step-by-step-go-grpc/helloworld";

package helloworld;

message HelloRequest { string name = 1; }

message HelloReply { string message = 1; }

service Greeter {
  rpc SayHello(HelloRequest) returns(HelloReply) {}
}

Step 4. Generate code from proto file

mkdir helloworld

protoc --go_out=helloworld --go_opt=paths=source_relative --go-grpc_out=helloworld --go-grpc_opt=paths=source_relative -I=./ helloworld.proto

Step 5. Initialize Go projects.

go mod init github.com/ryutah/step-by-step-go-grpc
go mod tidy

Step 6. Write code!

s *server github.com/ryutah/step-by-step-go-grpc/helloworld.GreeterServer

Step 7. Run Server

go run .

Step 8. Option implements reflection API

see

diff --git a/main.go b/main.go
index c1c49e9..66928c9 100644
--- a/main.go
+++ b/main.go
@@ -7,6 +7,7 @@ import (

        "github.com/ryutah/step-by-step-go-grpc/helloworld"
        "google.golang.org/grpc"
+       "google.golang.org/grpc/reflection"
 )

 // リクエストを受け取るサーバの実装をする
@@ -36,6 +37,8 @@ func main() {
        s := grpc.NewServer()
        helloworld.RegisterGreeterServer(s, &server{})

+       reflection.Register(s)
+
        if err := s.Serve(lis); err != nil {
                panic(err)
        }

Step 9. Exec API

go install github.com/fullstorydev/grpcurl/cmd/grpcurl@latest

grpcurl -plaintext -d '{"name": "ryutah"}' 127.0.0.1:50001 helloworld.Greeter/SayHello