本章节主要讲解Go语言如何实现简易的rpc通讯。实现方式有http、tcp、json，本文只讲解http方式，更多请移步底部github。

package main

import (
	"fmt"
	"log"
	"net/rpc"
	"os"
)

type Args struct {
	A, B int
}

type Quotient struct {
	Quo, Rem int
}

func main() {
	if len(os.Args) != 2 {
		fmt.Println("Usage: ", os.Args[0], "server")
		os.Exit(1)
	}
	serverAddress := os.Args[1]

	client, err := rpc.DialHTTP("tcp", serverAddress+":1234")
	if err != nil {
		log.Fatal("dialing:", err)
	}
	// Synchronous call
	args := Args{17, 8}
	var reply int
	err = client.Call("Math.Multiply", args, &reply)
	if err != nil {
		log.Fatal("Math error:", err)
	}
	fmt.Printf("Math: %d*%d=%d\n", args.A, args.B, reply)

	var quot Quotient
	err = client.Call("Math.Divide", args, &quot)
	if err != nil {
		log.Fatal("Math error:", err)
	}
	fmt.Printf("Math: %d/%d=%d remainder %d\n", args.A, args.B, quot.Quo, quot.Rem)

}

package main

import (
	"errors"
	"fmt"
	"net/http"
	"net/rpc"
)

type Args struct {
	A, B int
}

type Quotient struct {
	Quo, Rem int
}

type Math int

func (t *Math) Multiply(args *Args, reply *int) error {
	*reply = args.A * args.B
	return nil
}

func (t *Math) Divide(args *Args, quo *Quotient) error {
	if args.B == 0 {
		return errors.New("divide by zero")
	}
	quo.Quo = args.A / args.B
	quo.Rem = args.A % args.B
	return nil
}

func main() {

	math := new(Math)
	rpc.Register(math)
	rpc.HandleHTTP()

	err := http.ListenAndServe(":1234", nil)
	if err != nil {
		fmt.Println(err.Error())
	}
}

github：https://github.com/yangsir/beego_study