golang中的net/rpc包使用概述(小结)

func (t *T) MethodName(argType T1, replyType *T2) error

package main

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

type Args struct {
  A, B int
}

type Quotient struct {
  Quo, Rem int
}

type Arith int

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

func (t *Arith) 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() {
  arith := new(Arith)
  rpc.Register(arith)
  rpc.HandleHTTP()
  l, e := net.Listen("tcp", ":1234")
  if e != nil {
    log.Fatal("listen error:", e)
  }
  http.Serve(l, nil)
}

package main

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

type Args struct {
  A, B int
}

type Quotient struct {
  Quo, Rem int
}

func main() {
  client, err := rpc.DialHTTP("tcp", "127.0.0.1:1234")
  if err != nil {
    log.Fatal("dialing:", err)
  }

  // Synchronous call
  args := &Args{7,8}
  var reply int
  err = client.Call("Arith.Multiply", args, &reply)
  if err != nil {
    log.Fatal("arith error:", err)
  }
  fmt.Printf("Arith: %d*%d=%d\n", args.A, args.B, reply)

  // Asynchronous call
  quotient := new(Quotient)
  divCall := client.Go("Arith.Divide", args, quotient, nil)
  replyCall := <-divCall.Done  // will be equal to divCall
  if replyCall.Error != nil {
    log.Fatal("arith error:", replyCall.Error)
  }
  fmt.Printf("Arith: %d/%d=%d...%d", args.A, args.B, quotient.Quo, quotient.Rem)
  // check errors, print, etc.
}

Arith: 7*8=56
Arith: 7/8=0...7