client.go

package main

import "github.com/segmentio/rpc"
import "fmt"

type Args struct {
  A int
  B int
}

func main() {
  client, _ := rpc.Dial("tcp", ":5000")
  res := new(int)
  client.Call("Add", &Args{5, 5}, res)
  fmt.Printf("%d\n", *res)
}

server.go

package main

import "github.com/segmentio/rpc"

type Math struct{}

type Args struct {
  A int
  B int
}

func (m *Math) Add(req *Args, res *int) error {
  *res = req.A + req.B
  return nil
}

func (m *Math) Sub(req *Args, res *int) error {
  *res = req.A - req.B
  return nil
}

func main() {
  math := new(Math)
  rpc.New(math).ListenAndServe("tcp", ":5000")
}