Use golang RPC

Github: https://github.com/ZhangzheBJUT/blog/blob/master/golang_rpc.md

HTTP RPC

Server code

package mainimport ("errors""fmt""net/http""net/rpc")const (    URL = "192.168.2.172:12981")type Args struct {    A, B int}type Quotient struct {    Quo, Rem int}type Arith intfunc (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()    err := http.ListenAndServe(URL, nil)    if err != nil {        fmt.Println(err.Error())    }}

Client code

package mainimport (    "fmt"        "net/rpc”)const (    URL = "192.168.2.172:12982")func main() {    client, err := rpc.DialHTTP("tcp", URL)    if err != nil {        fmt.Println(err.Error())    }    args := Args{2, 4}    var reply int    err = client.Call("Arith.Multiply", &args, &reply)    if err != nil {        fmt.Println(err.Error())    } else {        fmt.Println(reply)    }}   

Two JSON-RPC

Server code

package mainimport ("errors""fmt""net""net/rpc""net/rpc/jsonrpc")const (    URL= "192.168.2.172:12981")type Args struct {    A, B int}type Quotient struct {    Quo, Rem int}type Arith intfunc (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)    tcpAddr, err := net.ResolveTCPAddr("tcp", URL)    if err != nil {        fmt.Println(err)    }    listener, err := net.ListenTCP("tcp", tcpAddr)    for {        conn, err := listener.Accept()        if err != nil {            continue        }        go jsonrpc.ServeConn(conn)    }}

Client code

package mainimport (    "fmt"        "net/rpc”)const (    URL = "192.168.2.172:12982")func main() {    client, err := jsonrpc.Dial("tcp", URL)    defer client.Close()    if err != nil {        fmt.Println(err)    }    args := Args{7, 2}    var reply int    err = client.Call("Arith.Multiply", &args, &reply)    if err != nil {        fmt.Println(err)    }    fmt.Println(reply)  }