Go言語でgRPCを学ぼう！~LongGreetAPI~

こんにちは。KOUKIです。

前回は、GreetManyTimeAPIを実装しました。今回はその続きから実装します。

<目次>

前回

Go言語でgRPCを学ぼう!~GreetManyTimes API~

Go言語記事まとめ

Go言語 ~ 記事まとめ ~

Calc Stream API

前回の復習がてら、Calc Stream APIを作成しましょう。

まずは、calculator.protoファイルに次の定義を行います。

// calculator/calculatorpb/calculator.proto
syntax = "proto3";

package calculator;
option go_package="calculatorpb";

service CalculatorService {
        // Unary
        rpc Calc(CalcRequest) returns (CalcResponse) {};
        // Server Streaming
        rpc CalcManyTimes(CalcManyTimesRequest) returns (stream CalcManyTimesResponse) {};
}

message Number {
        int32 num1 = 1;
        int32 num2 = 2;
}

message CalcRequest {
        Number number = 1;
}

message CalcResponse {
        int32 sum = 1;
}

message CalcManyTimesRequest {
        int32 calcNum = 1;
}

message CalcManyTimesResponse {
        int32 result = 1;
}

// calculator/calculatorpb/calculator.proto

syntax = "proto3";

package calculator;

option go_package="calculatorpb";

service CalculatorService {

// Unary

rpc Calc(CalcRequest) returns (CalcResponse) {};

// Server Streaming

rpc CalcManyTimes(CalcManyTimesRequest) returns (stream CalcManyTimesResponse) {};

}

message Number {

int32 num1 = 1;

int32 num2 = 2;

}

message CalcRequest {

Number number = 1;

}

message CalcResponse {

int32 sum = 1;

}

message CalcManyTimesRequest {

int32 calcNum = 1;

}

message CalcManyTimesResponse {

int32 result = 1;

}

下記のコマンドでコンパイルします。

./generate.sh

1	./generate.sh

次は、Serverコードを実装します。

// calculator/calculator_server/server.go
package main

import (
        "context"
        "fmt"
        "log"
        "net"
        "time"

        "github.com/selfnote/golang-grpc/calculator/calculatorpb"
        "google.golang.org/grpc"
)

type server struct{}

func (*server) Calc(ctx context.Context, req *calculatorpb.CalcRequest) (*calculatorpb.CalcResponse, error) {
        fmt.Printf("Calc function was invoked with %v\n", req)
        num1 := req.GetNumber().GetNum1()
        num2 := req.GetNumber().GetNum2()
        sum := num1 + num2

        res := &calculatorpb.CalcResponse{
                Sum: sum,
        }
        return res, nil
}

// new
func (*server) CalcManyTimes(req *calculatorpb.CalcManyTimesRequest, stream calculatorpb.CalculatorService_CalcManyTimesServer) error {
        fmt.Printf("CalcManyTimes function was invoked with %v\n", req)
        num := req.GetCalcNum()
        fmt.Println("num: ", num)
        var divNum int32 = 2
        for num > 1 {
                if num%divNum == 0 {
                        fmt.Println(divNum)
                        stream.Send(&calculatorpb.CalcManyTimesResponse{
                                Result: num,
                        })
                        num = num / divNum
                } else {
                        divNum++
                        fmt.Printf("Divisor has incresaed to %v\n", divNum)
                }
                time.Sleep(1000 * time.Millisecond)
        }
        return nil
}

func main() {
        fmt.Println("Server Start...")

        lis, err := net.Listen("tcp", "0.0.0.0:50051")
        if err != nil {
                log.Fatalf("Failed to listen: %v", err)
        }
        s := grpc.NewServer()
        calculatorpb.RegisterCalculatorServiceServer(s, &server{})

        if err := s.Serve(lis); err != nil {
                log.Fatalf("Failed to server %v", err)
        }
}

// calculator/calculator_server/server.go

package main

import (

"context"

"fmt"

"log"

"net"

"time"

"github.com/selfnote/golang-grpc/calculator/calculatorpb"

"google.golang.org/grpc"

)

type server struct{}

func (*server) Calc(ctx context.Context, req *calculatorpb.CalcRequest) (*calculatorpb.CalcResponse, error) {

fmt.Printf("Calc function was invoked with %v\n", req)

num1 := req.GetNumber().GetNum1()

num2 := req.GetNumber().GetNum2()

sum := num1 + num2

res := &calculatorpb.CalcResponse{

Sum: sum,

}

return res, nil

}

// new

func (*server) CalcManyTimes(req *calculatorpb.CalcManyTimesRequest, stream calculatorpb.CalculatorService_CalcManyTimesServer) error {

fmt.Printf("CalcManyTimes function was invoked with %v\n", req)

num := req.GetCalcNum()

fmt.Println("num: ", num)

var divNum int32 = 2

for num > 1 {

if num%divNum == 0 {

fmt.Println(divNum)

stream.Send(&calculatorpb.CalcManyTimesResponse{

Result: num,

})

num = num / divNum

} else {

divNum++

fmt.Printf("Divisor has incresaed to %v\n", divNum)

}

time.Sleep(1000 * time.Millisecond)

}

return nil

}

func main() {

fmt.Println("Server Start...")

lis, err := net.Listen("tcp", "0.0.0.0:50051")

if err != nil {

log.Fatalf("Failed to listen: %v", err)

}

s := grpc.NewServer()

calculatorpb.RegisterCalculatorServiceServer(s, &server{})

if err := s.Serve(lis); err != nil {

log.Fatalf("Failed to server %v", err)

}

続いて、Clientコードを実装します。

// calculator/calculator_client/client.go


package main

import (
        "context"
        "fmt"
        "io"
        "log"

        "github.com/selfnote/golang-grpc/calculator/calculatorpb"
        "google.golang.org/grpc"
)

func doUnary(c calculatorpb.CalculatorServiceClient) {
        fmt.Println("Starting to do a Unary RPC...")
        req := &calculatorpb.CalcRequest {
                Number: &calculatorpb.Number{
                        Num1: 3,
                        Num2: 10,
                },
        }
        res, err := c.Calc(context.Background(), req)

        if err != nil {
                log.Fatalf("error while calling Calc RPC: %v", err)
        }
        log.Printf("Response from Calc: %v", res.Sum)
}

// new
func doServerStreaming(c calculatorpb.CalculatorServiceClient) {
        fmt.Println("Starting to do a Server Streaming RPC...")

        req := &calculatorpb.CalcManyTimesRequest{
                CalcNum: 120,
        }

        resStream, err := c.CalcManyTimes(context.Background(), req)
        if err != nil {
                log.Fatalf("error while calling CalcManyTimes RPC: %v", err)
        }
        for {
                msg, err := resStream.Recv()
                if err == io.EOF {
                        break
                }
                if err != nil {
                        log.Fatalf("error while reading stream: %v", err)
                }
                log.Printf("Response from CalcManyTimes: %v", msg.GetResult())
        }
}

func main() {
        fmt.Println("Client Request...")
        cc, err := grpc.Dial("localhost:50051", grpc.WithInsecure())
        if err != nil {
                log.Fatalf("Could not connect: %v", err)
        }
        defer cc.Close()
        c := calculatorpb.NewCalculatorServiceClient(cc)
        fmt.Println("Created client: %f\n", c)
        // doUnary(c)
        doServerStreaming(c)
}

// calculator/calculator_client/client.go

package main

import (

"context"

"fmt"

"io"

"log"

"github.com/selfnote/golang-grpc/calculator/calculatorpb"

"google.golang.org/grpc"

)

func doUnary(c calculatorpb.CalculatorServiceClient) {

fmt.Println("Starting to do a Unary RPC...")

req := &calculatorpb.CalcRequest {

Number: &calculatorpb.Number{

Num1: 3,

Num2: 10,

}

res, err := c.Calc(context.Background(), req)

if err != nil {

log.Fatalf("error while calling Calc RPC: %v", err)

}

log.Printf("Response from Calc: %v", res.Sum)

}

// new

func doServerStreaming(c calculatorpb.CalculatorServiceClient) {

fmt.Println("Starting to do a Server Streaming RPC...")

req := &calculatorpb.CalcManyTimesRequest{

CalcNum: 120,

}

resStream, err := c.CalcManyTimes(context.Background(), req)

if err != nil {

log.Fatalf("error while calling CalcManyTimes RPC: %v", err)

}

for {

msg, err := resStream.Recv()

if err == io.EOF {

break

}

if err != nil {

log.Fatalf("error while reading stream: %v", err)

}

log.Printf("Response from CalcManyTimes: %v", msg.GetResult())

}

func main() {

fmt.Println("Client Request...")

cc, err := grpc.Dial("localhost:50051", grpc.WithInsecure())

if err != nil {

log.Fatalf("Could not connect: %v", err)

}

defer cc.Close()

c := calculatorpb.NewCalculatorServiceClient(cc)

fmt.Println("Created client: %f\n", c)

// doUnary(c)

doServerStreaming(c)

}

下記のコマンドで、Server->Clientの順でプログラムを実行しましょう。

make c_srv

go run calculator/calculator_server/server.go
Server Start...
CalcManyTimes function was invoked with calcNum:120
num:  120
2
2
2
Divisor has incresaed to 3
3
Divisor has incresaed to 4
Divisor has incresaed to 5
5


make c_cnt

go run calculator/calculator_client/client.go
Client Request...
Created client: %f
 &{0xc0000f6700}
Starting to do a Server Streaming RPC...
2019/10/25 14:51:57 Response from CalcManyTimes: 120
2019/10/25 14:51:58 Response from CalcManyTimes: 60
2019/10/25 14:51:59 Response from CalcManyTimes: 30
2019/10/25 14:52:01 Response from CalcManyTimes: 15
2019/10/25 14:52:04 Response from CalcManyTimes: 5

make c_srv

go run calculator/calculator_server/server.go

Server Start...

CalcManyTimes function was invoked with calcNum:120

num: 120

Divisor has incresaed to 3

Divisor has incresaed to 4

Divisor has incresaed to 5

make c_cnt

go run calculator/calculator_client/client.go

Client Request...

Created client: %f

&{0xc0000f6700}

Starting to do a Server Streaming RPC...

2019/10/25 14:51:57 Response from CalcManyTimes: 120

2019/10/25 14:51:58 Response from CalcManyTimes: 60

2019/10/25 14:51:59 Response from CalcManyTimes: 30

2019/10/25 14:52:01 Response from CalcManyTimes: 15

2019/10/25 14:52:04 Response from CalcManyTimes: 5

問題なく実行されましたね。復習終わりです。

LongGreetAPI – プロトファイルの作成 –

本日の目玉は、Client Streaming APIです。

Client Streaming APIには、以下の特徴があります。

Client Streaming APIの特徴・クライアントから複数のレスポンスを送り、サーバーから単一のレスポンスを受け取る
・クライアントから大量のデータを送りたいときに適する
・サーバーの処理負荷が高く、クライアントからデータを送信したいときに適する
・サーバーのレスポンスを待たないで、クライアントからデータを送信したいときに適する

Client Streaming APIを使用するときは、protoファイルのserviceのrequestを”stream“keywordと共に宣言します。

protoファイルを作成します。

// greet/greetpb/greet.proto

// version
syntax = "proto3";

// go pakcage
package greet;
// Include subdirectory into package too
option go_package="greetpb";

service GreetService{
        // Unary
        rpc Greet(GreetRequest) returns (GreetResponse){};

        // Server Streaming
        rpc GreetManyTimes(GreetManyTimesRequest) returns (stream GreetManyTimesResponse){};

        // new
        // Client Streaming
        rpc LongGreet(stream LongGreetRequest) returns (LongGreetResponse) {};
};

message Greeting {
        string first_name = 1;
        string last_name = 2;
}

message GreetRequest {
        Greeting greeting = 1;
}

message GreetResponse {
        string result = 1;
}

message GreetManyTimesRequest {
        Greeting greeting = 1;
}

message GreetManyTimesResponse {
        string result = 1;
}

// new
message LongGreetRequest {
        Greeting greeting = 1;
}

// new
message LongGreetResponse {
        string result = 1;
}

// greet/greetpb/greet.proto

// version

syntax = "proto3";

// go pakcage

package greet;

// Include subdirectory into package too

option go_package="greetpb";

service GreetService{

// Unary

rpc Greet(GreetRequest) returns (GreetResponse){};

// Server Streaming

rpc GreetManyTimes(GreetManyTimesRequest) returns (stream GreetManyTimesResponse){};

// new

// Client Streaming

rpc LongGreet(stream LongGreetRequest) returns (LongGreetResponse) {};

};

message Greeting {

string first_name = 1;

string last_name = 2;

}

message GreetRequest {

Greeting greeting = 1;

}

message GreetResponse {

string result = 1;

}

message GreetManyTimesRequest {

Greeting greeting = 1;

}

message GreetManyTimesResponse {

string result = 1;

}

// new

message LongGreetRequest {

Greeting greeting = 1;

}

// new

message LongGreetResponse {

string result = 1;

}

protoファイルが定義できたら、以下のコマンドでコンパイルします

./generate.sh

1	./generate.sh

LongGreetAPI – Serverコードの作成 –

LongGreet関数を実装します。

// greet/greet_server/server.go

package main

import (
        "context"
        "fmt"
        "io"
        "log"
        "net"
        "strconv"
        "time"

        "github.com/selfnote/golang-grpc/greet/greetpb"
        "google.golang.org/grpc"
)

type server struct{}

func (*server) Greet(ctx context.Context, req *greetpb.GreetRequest)(*greetpb.GreetResponse, error) {
        fmt.Printf("Greet function was invoked with %v\n", req)
        firstName := req.GetGreeting().GetFirstName()
        result := "Hello " + firstName

        res := &greetpb.GreetResponse {
                Result: result,
        }
        return res, nil
}

func (*server) GreetManyTimes(req *greetpb.GreetManyTimesRequest, stream greetpb.GreetService_GreetManyTimesServer) error {
        fmt.Printf("GreetManyTimes function was invoked with %v\n", req)
        firstName := req.GetGreeting().GetFirstName()
        // Do print 10 times.
        for i := 0; i < 10; i++ {
                result := "Hello " + firstName + " number" + strconv.Itoa(i)
                res := &greetpb.GreetManyTimesResponse {
                        Result: result,
                }
                stream.Send(res)
                time.Sleep(1000 * time.Millisecond)
        }
        return nil
}

// new
func (*server) LongGreet(stream greetpb.GreetService_LongGreetServer) error {
        fmt.Println("LongGreet function was invoked with a streaming request")
        result := ""

        for {
                req, err := stream.Recv()
                if err == io.EOF {
                        return stream.SendAndClose(&greetpb.LongGreetResponse{
                                Result: result,
                        })
                }

                if err != nil {
                        log.Fatalf("Error while reading client stream: %v", err)
                }

                firstName := req.GetGreeting().GetFirstName()
                result += "Hello " + firstName + "! "
        }
}

func main() {
        fmt.Println("Hello World")
        lis, err := net.Listen("tcp", "0.0.0.0:50051")
        if err != nil {
                log.Fatalf("Failed to listen: %v", err)
        }

        s := grpc.NewServer()

        greetpb.RegisterGreetServiceServer(s, &server{})

        if err := s.Serve(lis); err != nil {
                log.Fatalf("failed to serve: %v", err)
        }
}

// greet/greet_server/server.go

package main

import (

"context"

"fmt"

"io"

"log"

"net"

"strconv"

"time"

"github.com/selfnote/golang-grpc/greet/greetpb"

"google.golang.org/grpc"

)

type server struct{}

func (*server) Greet(ctx context.Context, req *greetpb.GreetRequest)(*greetpb.GreetResponse, error) {

fmt.Printf("Greet function was invoked with %v\n", req)

firstName := req.GetGreeting().GetFirstName()

result := "Hello " + firstName

res := &greetpb.GreetResponse {

Result: result,

}

return res, nil

}

func (*server) GreetManyTimes(req *greetpb.GreetManyTimesRequest, stream greetpb.GreetService_GreetManyTimesServer) error {

fmt.Printf("GreetManyTimes function was invoked with %v\n", req)

firstName := req.GetGreeting().GetFirstName()

// Do print 10 times.

for i := 0; i < 10; i++ {

result := "Hello " + firstName + " number" + strconv.Itoa(i)

res := &greetpb.GreetManyTimesResponse {

Result: result,

}

stream.Send(res)

time.Sleep(1000 * time.Millisecond)

}

return nil

}

// new

func (*server) LongGreet(stream greetpb.GreetService_LongGreetServer) error {

fmt.Println("LongGreet function was invoked with a streaming request")

result := ""

for {

req, err := stream.Recv()

if err == io.EOF {

return stream.SendAndClose(&greetpb.LongGreetResponse{

Result: result,

})

}

if err != nil {

log.Fatalf("Error while reading client stream: %v", err)

}

firstName := req.GetGreeting().GetFirstName()

result += "Hello " + firstName + "! "

}

func main() {

fmt.Println("Hello World")

lis, err := net.Listen("tcp", "0.0.0.0:50051")

if err != nil {

log.Fatalf("Failed to listen: %v", err)

}

s := grpc.NewServer()

greetpb.RegisterGreetServiceServer(s, &server{})

if err := s.Serve(lis); err != nil {

log.Fatalf("failed to serve: %v", err)

}

LongGreetAPI – Clientコードの作成 –

続いて、Client側のコードを実装していきます。

// greet/greet_client/client.go

package main

import (
        "context"
        "fmt"
        "io"
        "log"
        "time"
        "github.com/selfnote/golang-grpc/greet/greetpb"
        "google.golang.org/grpc"
)


func main() {
        fmt.Println("Hello I'm a client")
        cc, err := grpc.Dial("localhost:50051", grpc.WithInsecure())
        if err != nil {
                log.Fatalf("could not connect: %v", err)
        }
        defer cc.Close()
        c := greetpb.NewGreetServiceClient(cc)

        // doUnary(c)
        // doServerStreaming(c)
        doClientStreaming(c)
}

func doUnary(c greetpb.GreetServiceClient) {
        fmt.Println("Starting to do a Unary RPC...")
        req := &greetpb.GreetRequest{
                Greeting: &greetpb.Greeting{
                        FirstName: "Harry",
                        LastName: "Potter",
                },
        }
        res, err := c.Greet(context.Background(), req)
        if err != nil {
                log.Fatalf("error whiole caling Greet RPC: %v\n", err)
        }
        log.Printf("Response from Greet: %v\n", res.Result)
}

func doServerStreaming(c greetpb.GreetServiceClient) {
        fmt.Println("Starting to do a Server Streaming PRC...")

        req := &greetpb.GreetManyTimesRequest {
                Greeting: &greetpb.Greeting {
                        FirstName: "Hary",
                        LastName: "Potter",
                },
        }

        resStream, err := c.GreetManyTimes(context.Background(), req)
        if err != nil {
                log.Fatalf("error while calling GreetManyTimes RPC: %v", err)
        }

        for {
                msg, err := resStream.Recv()
                if err == io.EOF {
                        fmt.Println(io.EOF)
                        break
                }
                if err != nil {
                        log.Fatalf("error while reading stream: %v", err)
                }
                log.Printf("Response from greetManyTimes: %v", msg.GetResult())
        }
}

// new
func doClientStreaming(c greetpb.GreetServiceClient) {
        fmt.Println("Streaming to do a Cient streaming RPC...")

        requests := []*greetpb.LongGreetRequest {
                &greetpb.LongGreetRequest {
                        Greeting: &greetpb.Greeting {
                                FirstName: "Harry",
                        },
                },
                &greetpb.LongGreetRequest {
                        Greeting: &greetpb.Greeting {
                                FirstName: "Mark",
                        },
                },
                &greetpb.LongGreetRequest {
                        Greeting: &greetpb.Greeting {
                                FirstName: "Mary",
                        },
                },
                &greetpb.LongGreetRequest {
                        Greeting: &greetpb.Greeting {
                                FirstName: "Jane",
                        },
                },
                &greetpb.LongGreetRequest {
                        Greeting: &greetpb.Greeting {
                                FirstName: "Upper",
                        },
                },
        }

        stream, err := c.LongGreet(context.Background())
        if err != nil {
                log.Fatalf("error while calling LongGreet: %v", err)
        }
        for _, req := range requests {
                fmt.Println("Sending req: %v\n", req)
                stream.Send(req)
                time.Sleep(1000 * time.Millisecond)
        }

        res, err := stream.CloseAndRecv()
        if err != nil {
                log.Fatalf("error while receiving response from LongGreet: %v\n", err)
        }
        fmt.Printf("LongGreet Response: %v\n", res)
}

100

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118

119

120

// greet/greet_client/client.go

package main

import (

"context"

"fmt"

"io"

"log"

"time"

"github.com/selfnote/golang-grpc/greet/greetpb"

"google.golang.org/grpc"

)

func main() {

fmt.Println("Hello I'm a client")

cc, err := grpc.Dial("localhost:50051", grpc.WithInsecure())

if err != nil {

log.Fatalf("could not connect: %v", err)

}

defer cc.Close()

c := greetpb.NewGreetServiceClient(cc)

// doUnary(c)

// doServerStreaming(c)

doClientStreaming(c)

}

func doUnary(c greetpb.GreetServiceClient) {

fmt.Println("Starting to do a Unary RPC...")

req := &greetpb.GreetRequest{

Greeting: &greetpb.Greeting{

FirstName: "Harry",

LastName: "Potter",

}

res, err := c.Greet(context.Background(), req)

if err != nil {

log.Fatalf("error whiole caling Greet RPC: %v\n", err)

}

log.Printf("Response from Greet: %v\n", res.Result)

}

func doServerStreaming(c greetpb.GreetServiceClient) {

fmt.Println("Starting to do a Server Streaming PRC...")

req := &greetpb.GreetManyTimesRequest {

Greeting: &greetpb.Greeting {

FirstName: "Hary",

LastName: "Potter",

}

resStream, err := c.GreetManyTimes(context.Background(), req)

if err != nil {

log.Fatalf("error while calling GreetManyTimes RPC: %v", err)

}

for {

msg, err := resStream.Recv()

if err == io.EOF {

fmt.Println(io.EOF)

break

}

if err != nil {

log.Fatalf("error while reading stream: %v", err)

}

log.Printf("Response from greetManyTimes: %v", msg.GetResult())

}

// new

func doClientStreaming(c greetpb.GreetServiceClient) {

fmt.Println("Streaming to do a Cient streaming RPC...")

requests := []*greetpb.LongGreetRequest {

&greetpb.LongGreetRequest {

Greeting: &greetpb.Greeting {

FirstName: "Harry",

&greetpb.LongGreetRequest {

Greeting: &greetpb.Greeting {

FirstName: "Mark",

&greetpb.LongGreetRequest {

Greeting: &greetpb.Greeting {

FirstName: "Mary",

&greetpb.LongGreetRequest {

Greeting: &greetpb.Greeting {

FirstName: "Jane",

&greetpb.LongGreetRequest {

Greeting: &greetpb.Greeting {

FirstName: "Upper",

}

stream, err := c.LongGreet(context.Background())

if err != nil {

log.Fatalf("error while calling LongGreet: %v", err)

}

for _, req := range requests {

fmt.Println("Sending req: %v\n", req)

stream.Send(req)

time.Sleep(1000 * time.Millisecond)

}

res, err := stream.CloseAndRecv()

if err != nil {

log.Fatalf("error while receiving response from LongGreet: %v\n", err)

}

fmt.Printf("LongGreet Response: %v\n", res)

}

Clientからは複数のデータを送りたいので、requestsにデータを5つほど詰め込んで、Server側へコードを送信する処理を書きました。

LongGreetAPI – 動作確認 –

Server -> Clientの順に下記のコマンドでプログラムを実行します。

make server

go run greet/greet_server/server.go
Hello World
LongGreet function was invoked with a streaming request

make client

go run greet/greet_client/client.go
Hello I'm a client
Streaming to do a Cient streaming RPC...
Sending req: %v
 greeting:<first_name:"Harry" >
Sending req: %v
 greeting:<first_name:"Mark" >
Sending req: %v
 greeting:<first_name:"Mary" >
Sending req: %v
 greeting:<first_name:"Jane" >
Sending req: %v
 greeting:<first_name:"Upper" >
LongGreet Response: result:"Hello Harry! Hello Mark! Hello Mary! Hello Jane! Hello Upper! "

make server

go run greet/greet_server/server.go

Hello World

LongGreet function was invoked with a streaming request

make client

go run greet/greet_client/client.go

Hello I'm a client

Streaming to do a Cient streaming RPC...

Sending req: %v

greeting:<first_name:"Harry" >

Sending req: %v

greeting:<first_name:"Mark" >

Sending req: %v

greeting:<first_name:"Mary" >

Sending req: %v

greeting:<first_name:"Jane" >

Sending req: %v

greeting:<first_name:"Upper" >

LongGreet Response: result:"Hello Harry! Hello Mark! Hello Mary! Hello Jane! Hello Upper! "

次回

次回は、Bi Directional Streaming APIについて学習します。

Go言語でgRPCを学ぼう！-GreetEveryoneAPI –

参考書籍

入門Goプログラミング【電子書籍】[ Nathan Youngman ]

楽天で購入

Head First Go【電子書籍】[ Jay McGavren ]

楽天で購入

Go言語でgRPCを学ぼう！~LongGreetAPI~

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Go言語記事まとめ

Calc Stream API

LongGreetAPI – プロトファイルの作成 –

LongGreetAPI – Serverコードの作成 –

LongGreetAPI – Clientコードの作成 –

LongGreetAPI – 動作確認 –

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前回

Go言語記事まとめ

Calc Stream API

LongGreetAPI – プロトファイルの作成 –

LongGreetAPI – Serverコードの作成 –

LongGreetAPI – Clientコードの作成 –

LongGreetAPI – 動作確認 –

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