こんにちは。KOUKIです。
今回は、BlogAPIをgRPCで実装します。
前回
Go言語記事まとめ
プロジェクトSet UP!
次のディレクトリとファイルを作成してください。
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mkdir -p blog/blogpb mkdir blog/blog_server mkdir blog/blog_client touch blog/blogpb/blog.proto touch blog/blog_server/server.go touch blog/blog_client/client.go |
BlogAPI – protoファイルの作成 –
最初にprotoファイルを作成しましょう。
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syntax = "proto3"; package blog; option go_package = "blogpg"; message Blog { string id = 1; string author_id = 2; string title = 3; string content = 4; } message CreateBlogRequest { Blog blog = 1; } message CreateBlogResponse { Blog blog = 1; // will have a blog id } service BlogService { rpc CreateBlog (CreateBlogRequest) returns (CreateBlogResponse); } |
次にgenerate.shに以下のコマンドを追加してください。
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#!/bin/bash export PATH=$PATH:/Users/<user>/go/bin protoc greet/greetpb/greet.proto --go_out=plugins=grpc:. protoc calculator/calculatorpb/calculator.proto --go_out=plugins=grpc:. # new protoc blog/blogpb/blog.proto --go_out=plugins=grpc:. |
コンパイルします。
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./generate.sh |
BlogAPI – Serverコードの作成 –
Serverコードを実装します。
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// blog/blog_server/server.go package main import ( "fmt" "log" "net" "os" "os/signal" blogpb "github.com/selfnote/golang-grpc/blog/blogpb" "google.golang.org/grpc" ) type server struct{} func main() { // if we crash the go code, we get the file name and line number log.SetFlags(log.LstdFlags | log.Lshortfile) fmt.Println("Blog Service Started") lis, err := net.Listen("tcp", "0.0.0.0:50051") if err != nil { log.Fatalf("Failed to listen: %v", err) } opts := []grpc.ServerOption{} s := grpc.NewServer(opts...) blogpb.RegisterBlogServiceServer(s, &server{}) go func() { fmt.Println("Starting Server....") if err := s.Serve(lis); err != nil { log.Fatalf("failed to serve: %v", err) } }() // Wait for control C to exit ch := make(chan os.Signal, 1) signal.Notify(ch, os.Interrupt) // Block until a signal is received <-ch fmt.Println("Stopping the server") s.Stop() fmt.Println("Closing the listener") lis.Close() fmt.Println("End of Program") } |
BlogAPI – Makefile修正 –
Makefileに下記のコマンドを追加してください。
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.PHONY: server client c_srv c_cnt b_srv b_cnt server: go run greet/greet_server/server.go client: go run greet/greet_client/client.go b_srv: go run blog/blog_server/server.go b_cnt: go run blog/blog_client/client.go c_srv: go run calculator/calculator_server/server.go c_cnt: go run calculator/calculator_client/client.go |
BlogAPI – MongoDBのインストール –
DBにMongoDBを使用するので、インストールしてください。
以下は、Linux Centos7のインストール例です。
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# リポジトリ作成 sudo vi /etc/yum.repos.d/mongodb-org-4.0.repo # リポジトリの中身 [mongodb-org-4.0] name=MongoDB Repository baseurl=https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/4.0/x86_64/ gpgcheck=1 enabled=1 gpgkey=https://www.mongodb.org/static/pgp/server-4.0.asc # インストール sudo yum install -y mongodb-org # バージョン確認 mongod -version db version v4.0.13 # 起動 sudo systemctl start mongod # 確認コマンド sudo systemctl status mongod ● mongod.service - MongoDB Database Server Loaded: loaded (/usr/lib/systemd/system/mongod.service; enabled; vendor preset: disabled) Active: active (running) since 月 2019-10-28 11:44:39 JST; 15s ago |
MongoDBを導入できたらmonogo-go-driverをインストールします。
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go get go.mongodb.org/mongo-driver/mongo go get github.com/globalsign/mgo |
BlogAPI – Serverコードの作成2 –
MongoDBへのアクセス準備は整ったので、Serverコードを書き換えます。
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// blog/blog_server/server.go package main import ( "context" "fmt" "log" "net" "os" "os/signal" "github.com/globalsign/mgo/bson" blogpb "github.com/selfnote/golang-grpc/blog/blogpb" "google.golang.org/grpc" "go.mongodb.org/mongo-driver/mongo" "go.mongodb.org/mongo-driver/mongo/options" "go.mongodb.org/mongo-driver/bson/primitive" "google.golang.org/grpc/codes" "google.golang.org/grpc/status" ) var collection *mongo.Collection type server struct{} type blogItem struct { ID bson.ObjectId `bson:"_id.omitempty"` AuthorID string `bson:"author_id"` Content string `bson:"content"` Title string `bson:"title"` } func (*server) CreateBlog(ctx context.Context, req *blogpb.CreateBlogRequest)(*blogpb.CreateBlogResponse, error) { fmt.Println("Create blog request") blog := req.GetBlog() data := blogItem{ AuthorID: blog.GetAuthorId(), Title: blog.GetTitle(), Content: blog.GetContent(), } res, err := collection.InsertOne(context.Background(), data) if err != nil { return nil, status.Errorf( codes.Internal, fmt.Sprintf("Internal Error: %v", err), ) } oid, ok := res.InsertedID.(primitive.ObjectID) if !ok { return nil, status.Errorf( codes.Internal, fmt.Sprintf("Cannot convert to OID"), ) } return &blogpb.CreateBlogResponse{ Blog: &blogpb.Blog{ Id: oid.Hex(), AuthorId: blog.GetAuthorId(), Title: blog.GetTitle(), Content: blog.GetContent(), }, }, nil } func main() { // if we crash the go code, we get the file name and line number log.SetFlags(log.LstdFlags | log.Lshortfile) fmt.Println("Connecting to MongoDB") // connect to MongoDB client, err := mongo.NewClient(options.Client().ApplyURI("mongodb://localhost:27017")) if err != nil { log.Fatal(err) } err = client.Connect(context.TODO()) if err != nil { log.Fatal(err) } fmt.Println("Blog Service Started") collection = client.Database("mydb").Collection("blog") lis, err := net.Listen("tcp", "0.0.0.0:50051") if err != nil { log.Fatalf("Failed to listen: %v", err) } collection = client.Database("mydb").Collection("blog") opts := []grpc.ServerOption{} s := grpc.NewServer(opts...) blogpb.RegisterBlogServiceServer(s, &server{}) go func() { fmt.Println("Starting Server....") if err := s.Serve(lis); err != nil { log.Fatalf("failed to serve: %v", err) } }() // Wait for control C to exit ch := make(chan os.Signal, 1) signal.Notify(ch, os.Interrupt) // Block until a signal is received <-ch fmt.Println("Stopping the server") s.Stop() fmt.Println("Closing the listener") lis.Close() fmt.Println("Closing MongoDB Connection") client.Disconnect(context.TODO()) fmt.Println("End of Program") } |
BlogAPI – Client コードの作成 –
最後にClientコードを作成します。
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// blog/blog_client/client.go package main import ( "context" "fmt" "log" blogpb "github.com/selfnote/golang-grpc/blog/blogpb" "google.golang.org/grpc" ) func main() { fmt.Println("Blog Client") opts := grpc.WithInsecure() cc, err := grpc.Dial("localhost:50051", opts) if err != nil { log.Fatalf("could not connect: %v", err) } defer cc.Close() c := blogpb.NewBlogServiceClient(cc) // create Blog fmt.Println("Create a blog") blog := &blogpb.Blog{ AuthorId: "j.k rowling", Title: "Harry Potter", Content: "Magical Stuend Story", } createBlogRes, err := c.CreateBlog(context.Background(), &blogpb.CreateBlogRequest{Blog: blog}) if err != nil { log.Fatal("Unexpected error: %v", err) } fmt.Println("Blog has been created: %v", createBlogRes) } |
BlogAPI – 動作確認 –
動作確認をしてみましょう。
Server -> Clientの順にプログラムを実行してください。
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make b_srv go run blog/blog_server/server.go Connecting to MongoDB Blog Service Started Starting Server.... Create blog request make b_cnt go run blog/blog_client/client.go Blog Client Create a blog Blog has been created: %v blog:<id:"5db672ddd3b1266bd860da8b" author_id:"j.k rowling" title:"Harry Potter" content:"Magical Stuend Story" > |
上手くいきましたね。この調子で、データ一覧の取得やデータ削除などにもTryしてみてください。
MongoDB関連記事
おまけ: DBデータ全件取得
MongoDBのデータを全件取得します。
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syntax = "proto3"; package blog; option go_package = "blogpg"; message Blog { string id = 1; string author_id = 2; string title = 3; string content = 4; } message CreateBlogRequest { Blog blog = 1; } message CreateBlogResponse { Blog blog = 1; } message FindBlogRequest { } message FindBlogResponse { Blog blog = 1; } service BlogService { rpc CreateBlog (CreateBlogRequest) returns (CreateBlogResponse); // new rpc FindBlog (FindBlogRequest) returns (stream FindBlogResponse); } |
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// blog/blog_server/server.go package main import ( "context" "fmt" "log" "net" "os" "os/signal" "github.com/globalsign/mgo/bson" blogpb "github.com/selfnote/golang-grpc/blog/blogpb" "google.golang.org/grpc" "go.mongodb.org/mongo-driver/mongo" "go.mongodb.org/mongo-driver/mongo/options" "go.mongodb.org/mongo-driver/bson/primitive" "google.golang.org/grpc/codes" "google.golang.org/grpc/status" ) var collection *mongo.Collection type server struct{} type blogItem struct { ID bson.ObjectId `bson:"_id.omitempty"` AuthorID string `bson:"author_id"` Content string `bson:"content"` Title string `bson:"title"` } func (*server) CreateBlog(ctx context.Context, req *blogpb.CreateBlogRequest)(*blogpb.CreateBlogResponse, error) { fmt.Println("Create blog request") blog := req.GetBlog() data := blogItem{ AuthorID: blog.GetAuthorId(), Title: blog.GetTitle(), Content: blog.GetContent(), } res, err := collection.InsertOne(context.Background(), data) if err != nil { return nil, status.Errorf( codes.Internal, fmt.Sprintf("Internal Error: %v", err), ) } oid, ok := res.InsertedID.(primitive.ObjectID) if !ok { return nil, status.Errorf( codes.Internal, fmt.Sprintf("Cannot convert to OID"), ) } return &blogpb.CreateBlogResponse{ Blog: &blogpb.Blog{ Id: oid.Hex(), AuthorId: blog.GetAuthorId(), Title: blog.GetTitle(), Content: blog.GetContent(), }, }, nil } // new func (*server) FindBlog(req *blogpb.FindBlogRequest, stream blogpb.BlogService_FindBlogServer) error { fmt.Println("Find blog data") data := &blogItem{} cursor, err := collection.Find(context.Background(), bson.M{}) if err != nil { return status.Errorf(codes.Internal, fmt.Sprintf("Unknown internal error: %v", err)) } defer cursor.Close(context.Background()) for cursor.Next(context.Background()) { err := cursor.Decode(data) if err != nil { return status.Errorf(codes.Unavailable, fmt.Sprintf("Could not decode data: %v", err)) } stream.Send(&blogpb.FindBlogResponse{ Blog: &blogpb.Blog { Id: data.ID.Hex(), AuthorId: data.AuthorID, Content: data.Content, Title: data.Title, }, }) } if err := cursor.Err(); err != nil { return status.Errorf(codes.Internal, fmt.Sprintf("Unknown cursor error: %v", err)) } return nil } func main() { // if we crash the go code, we get the file name and line number log.SetFlags(log.LstdFlags | log.Lshortfile) fmt.Println("Connecting to MongoDB") // connect to MongoDB client, err := mongo.NewClient(options.Client().ApplyURI("mongodb://localhost:27017")) if err != nil { log.Fatal(err) } err = client.Connect(context.TODO()) if err != nil { log.Fatal(err) } fmt.Println("Blog Service Started") collection = client.Database("mydb").Collection("blog") lis, err := net.Listen("tcp", "0.0.0.0:50051") if err != nil { log.Fatalf("Failed to listen: %v", err) } collection = client.Database("mydb").Collection("blog") opts := []grpc.ServerOption{} s := grpc.NewServer(opts...) blogpb.RegisterBlogServiceServer(s, &server{}) go func() { fmt.Println("Starting Server....") if err := s.Serve(lis); err != nil { log.Fatalf("failed to serve: %v", err) } }() // Wait for control C to exit ch := make(chan os.Signal, 1) signal.Notify(ch, os.Interrupt) // Block until a signal is received <-ch fmt.Println("Stopping the server") s.Stop() fmt.Println("Closing the listener") lis.Close() fmt.Println("Closing MongoDB Connection") client.Disconnect(context.TODO()) fmt.Println("End of Program") } |
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package main import ( "context" "fmt" "io" "log" blogpb "github.com/selfnote/golang-grpc/blog/blogpb" "google.golang.org/grpc" ) func main() { fmt.Println("Blog Client") opts := grpc.WithInsecure() cc, err := grpc.Dial("localhost:50051", opts) if err != nil { log.Fatalf("could not connect: %v", err) } defer cc.Close() c := blogpb.NewBlogServiceClient(cc) // create Blog fmt.Println("Create a blog") //blog := &blogpb.Blog{ //AuthorId: "j.k rowling", //Title: "Harry Potter", //Content: "Magical Stuend Story", //} // createBlogRes, err := c.CreateBlog(context.Background(), &blogpb.CreateBlogRequest{Blog: blog}) resStream, err := c.FindBlog(context.Background(), &blogpb.FindBlogRequest{}) if err != nil { log.Fatal("Unexpected error: %v", err) } for { msg, err := resStream.Recv() if err == io.EOF { fmt.Println(io.EOF) // EOF break } if err != nil { log.Fatalf("error while reading stream: %v", err) } log.Printf("Response from GreetManyTimes: %v", msg.GetBlog()) } // fmt.Println("Blog has been created: %v", createBlogRes) } |
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make b_srv go run blog/blog_server/server.go Connecting to MongoDB Blog Service Started Starting Server.... Find blog data make b_cnt go run blog/blog_client/client.go Blog Client Create a blog 2019/10/28 14:55:01 Response from GreetManyTimes: author_id:"j.k rowling" title:"Harry Potter" content:"Magical Stuend Story" 2019/10/28 14:55:01 Response from GreetManyTimes: author_id:"j.k rowling" title:"Harry Potter" content:"Magical Stuend Story" 2019/10/28 14:55:01 Response from GreetManyTimes: author_id:"j.k rowling" title:"Harry Potter" content:"Magical Stuend Story" 2019/10/28 14:55:01 Response from GreetManyTimes: author_id:"j.k rowling" title:"Harry Potter" content:"Magical Stuend Story" 2019/10/28 14:55:01 Response from GreetManyTimes: author_id:"j.k rowling" title:"Harry Potter" content:"Magical Stuend Story" 2019/10/28 14:55:01 Response from GreetManyTimes: author_id:"j.k rowling" title:"Harry Potter" content:"Magical Stuend Story" 2019/10/28 14:55:01 Response from GreetManyTimes: author_id:"j.k rowling" title:"Harry Potter" content:"Magical Stuend Story" 2019/10/28 14:55:01 Response from GreetManyTimes: author_id:"j.k rowling" title:"Harry Potter" content:"Magical Stuend Story" 2019/10/28 14:55:01 Response from GreetManyTimes: author_id:"j.k rowling" title:"Harry Potter" content:"Magical Stuend Story" 2019/10/28 14:55:01 Response from GreetManyTimes: author_id:"j.k rowling" title:"Harry Potter" content:"Magical Stuend Story" EOF |
おわりに
Go言語でのgRPCの学習は、今回で最後です。
色々なAPIの作成に挑戦してみてください。
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