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@ekzemplaro

Go の gRPC で Redis のデータを作成 (Create)

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設定ファイル、サーバープログラム、クライアントプログラムの3つが必要です。

$ tree
.
├── redis_create
│   └── redis_create.proto
├── redis_create_client
│   └── main.go
└── redis_create_server
    └── main.go

設定ファイル

redis_create/redis_create.proto

syntax = "proto3";

package redis_create;

service Greeter {
    rpc RedisCreate (RedisRequest) returns (RedisReply) {}
}

message RedisRequest {
    string key = 1;
    string strjson = 2;
}

message RedisReply {
    string key = 1;
}

サーバープログラム

redis_create_server/main.go
// ---------------------------------------------------------------
//
//  redis_create_server/main.go
//
//                  Feb/12/2020 
// ---------------------------------------------------------------
package main

import (
    "context"
    "log"
    "net"
    "fmt"
    "os"

    "google.golang.org/grpc"
    pb "../redis_create"
)

const (
    port = ":50051"
)

type server struct {
    pb.UnimplementedGreeterServer
}

// ---------------------------------------------------------------
func redis_socket_write_proc (conn net.Conn,key_in string,json_str string) {
    fmt.Println (key_in)
    fmt.Println (json_str)

    comm_aa := "set " + key_in + " '" + json_str + "'\r\n"
    conn.Write([]byte(comm_aa))


    buf := make ([]byte,1024)
    conn.Read (buf[:])

    fmt.Println (string(buf[0:10]))
}

// ---------------------------------------------------------------
func redis_create_proc (key_in string,str_json string) string {

    hostname := "localhost"
    port := "6379"

    conn, err := net.Dial ("tcp", hostname + ":" + port)
    if err != nil {
        fmt.Println(err)
        return str_json
        }

    fmt.Fprintf (os.Stderr,"str_json = " + str_json + "\n")
    redis_socket_write_proc (conn,key_in,str_json)

    return key_in
}
// ---------------------------------------------------------------
func (s *server) RedisCreate(ctx context.Context, in *pb.RedisRequest) (*pb.RedisReply, error) {
    fmt.Fprintf (os.Stderr,"*** check aaa ***\n")
    key := in.GetKey()
    str_json := in.GetStrjson()
    fmt.Fprintf (os.Stderr,"key = " + key + "\n")
    fmt.Fprintf (os.Stderr,"str_json = " + str_json + "\n")
    redis_create_proc (key,str_json)
    return &pb.RedisReply{Key: key }, nil
}

// ---------------------------------------------------------------
func main() {
    lis, err := net.Listen("tcp", port)
    if err != nil {
        log.Fatalf("failed to listen: %v", err)
    }
    s := grpc.NewServer()
    pb.RegisterGreeterServer(s, &server{})
    if err := s.Serve(lis); err != nil {
        log.Fatalf("failed to serve: %v", err)
    }
}

// ---------------------------------------------------------------

クライアントプログラム

redis_create_client/main.go
// ---------------------------------------------------------------
//
//  redis_create_client/main.go
//
//                  Feb/12/2020
//
// ---------------------------------------------------------------
package main

import (
    "context"
    "fmt"
    "log"
    "os"
    "encoding/json"
    "strconv"
    "time"

    "google.golang.org/grpc"
    pb "../redis_create"
)

const (
    address     = "localhost:50051"
    defaultKey = "t0001"
    defaultName = "aaaa"
    defaultPopulation = 1
    defaultDate_mod = "2000-01-01"
)

// ---------------------------------------------------------------
func main() {
    // Set up a connection to the server.
    conn, err := grpc.Dial(address, grpc.WithInsecure(), grpc.WithBlock())
    if err != nil {
        log.Fatalf("did not connect: %v", err)
    }
    defer conn.Close()
    c := pb.NewGreeterClient(conn)

    // Contact the server and print out its response.
    key := defaultKey
    unit_aa := make(map[string]interface{})
    unit_aa["name"] = defaultName
    unit_aa["population"] = defaultPopulation
    unit_aa["date_mod"] = defaultDate_mod
    if len(os.Args) > 1 {
        key = os.Args[1]
        unit_aa["name"] = os.Args[2]
        unit_aa["population"],_ = strconv.Atoi (os.Args[3])
        unit_aa["date_mod"] = os.Args[4]
    }
    ctx, cancel := context.WithTimeout(context.Background(), time.Second)
    defer cancel()
    output, _ := json.Marshal(unit_aa)
    str_json := string(output)  
    r, err := c.RedisCreate(ctx, &pb.RedisRequest{Key: key,Strjson: str_json})
    if err != nil {
        log.Fatalf("could not greet: %v", err)
    }

    rvalue := r.GetKey()

    fmt.Printf ("%s\n",rvalue)
}

// ---------------------------------------------------------------

gRPC のコードを作成します。

スクリプト

protoc -I redis_create redis_create/redis_create.proto --go_out=plugins=grpc:redis_create

サーバープログラムの起動

go run redis_create_server/main.go

クライアントプログラムの実行

$ go run redis_create_client/main.go t0934  那須烏山 42938 2003-9-22
t0934
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