徹底した調査: Go 言語 RPC フレームワークの長所と短所の分析

package main

import (
    "fmt"
    "net/rpc"
)

type Args struct {
    A, B int
}

type Reply struct {
    Result int
}

func main() {
    client, err := rpc.DialHTTP("tcp", "localhost:1234")
    if err != nil {
        fmt.Println("Error: ", err)
        return
    }

    args := Args{3, 4}
    var reply Reply
    err = client.Call("MathService.Multiply", args, &reply)
    if err != nil {
        fmt.Println("Error: ", err)
        return
    }

    fmt.Println("Multiply: ", reply.Result)
}

package main

import (
    "fmt"
    "net/rpc"
)

type MathService struct{}

func (m *MathService) Multiply(args Args, reply *Reply) error {
    reply.Result = args.A * args.B
    return nil
}

func main() {
    math := new(MathService)
    rpc.Register(math)

    listener, err := net.Listen("tcp", ":1234")
    if err != nil {
        fmt.Println("Error: ", err)
        return
    }

    http.Serve(listener, nil)
}

func (m *MathService) Divide(args Args, reply *Reply) error {
    if args.B == 0 {
        return errors.New("divide by zero")
    }
    reply.Result = args.A / args.B
    return nil
}