golang的rpc有两种方法进行调用，一种是rpc例子中给的：
package main
import (
"net/rpc"
"net/http"
"log"
"net"
"time"
)
type Args struct {
A, B int
}
type Arith int
func (t *Arith) Multiply(args *Args, reply *([]string)) error {
*reply = append(*reply, "test")
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)
}
go http.Serve(l, nil)
time.Sleep(5 * time.Second)
client, err := rpc.DialHTTP("tcp", "127.0.0.1" + ":1234")
if err != nil {
log.Fatal("dialing:", err)
}
args := &Args{7,8}
reply := make([]string, 10)
err = client.Call("Arith.Multiply", args, &reply)
if err != nil {
log.Fatal("arith error:", err)
}
log.Println(reply)
}
另一种是使用NewServer
这种是当rpc已经注册的时候就要使用了另外一种了。即一个server只能在DefaultRPC中注册一种类型。
当Server使用rpc.NewServer的时候，client也需要进行下改动了
package main
import (
"net/rpc"
//"net/http"
"log"
"net"
"time"
)
type Args struct {
A, B int
}
type Arith int
func (t *Arith) Multiply(args *Args, reply *([]string)) error {
*reply = append(*reply, "test")
return nil
}
func main() {
newServer := rpc.NewServer()
newServer.Register(new(Arith))
l, e := net.Listen("tcp", "127.0.0.1:1234") // any available address
if e != nil {
log.Fatalf("net.Listen tcp :0: %v", e)
}
go newServer.Accept(l)
newServer.HandleHTTP("/foo", "/bar")
time.Sleep(2 * time.Second)
address, err := net.ResolveTCPAddr("tcp", "127.0.0.1:1234")
if err != nil {
panic(err)
}
conn, _ := net.DialTCP("tcp", nil, address)
defer conn.Close()
client := rpc.NewClient(conn)
defer client.Close()
args := &Args{7,8}
reply := make([]string, 10)
err = client.Call("Arith.Multiply", args, &reply)
if err != nil {
log.Fatal("arith error:", err)
}
log.Println(reply)
}第二个例子中的
newServer.HandleHTTP("/foo", "/bar") 可以任意设置，第一个例子其实是设置了默认的两个
这里也顺便将reply作为[]slice的例子给演示了下
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