golang rpc示例

rpc即远程过程调用。
在server端提供计算、文件存储等服务。在客户端去调用server端的这些服务，使客户端的业务变得简洁和高效。

server：

package main

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

// HelloService is rpc server obj
type HelloService struct{}

// Hello is rpc server method x.
func (p *HelloService) Hello(request string, reply *string) error {
  *reply = "hello:" + request
  return nil
}

// GoodLuck is rpc server method x
func (p *HelloService) GoodLuck(request string, reply *string) error {
  *reply = "Good_luck:" + request
  return nil
}

func main() {
  rpc.RegisterName("HelloService", new(HelloService))
  listener, err := net.Listen("tcp", ":1235")
  if err != nil {
    log.Fatal("ListenTCP error:", err)
  }
  for {
    conn, err := listener.Accept()
    if err != nil {
      log.Fatal("Accept error:", err)
    }
    go func() {
      rpc.ServeConn(conn)
    }()
  }
}

client:

package main

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

func main() {
  client, err := rpc.Dial("tcp", "localhost:1235")
  if err != nil {
    log.Fatal("dialing:", err)
  }
  var reply string
  err = client.Call("HelloService.Hello", "hello", &reply)
  if err != nil {
    log.Fatal(err)
  }
  fmt.Println(reply)
  err = client.Call("HelloService.GoodLuck", "hello", &reply)
  if err != nil {
    log.Fatal(err)
  }
  fmt.Println(reply)
}

使用vscode调试。开启服务器端，开启客户端。客户端的执行结果如下：

API server listening at: 127.0.0.1:41148
hello:hello
Good_luck:hello
Process exiting with code: 0