我有一个用Go语言编写的“hello world” RPC服务,它可以正常运行,并且Go jsonrpc客户端也可以使用。但是我需要使用curl发送请求,但是这个例子无法正常工作:
curl \
-X POST \
-H "Content-Type: application/json" \
-d '{"id": 1, "method": "Test.Say", "params": [{"greet": "world"}]}' \
http://localhost:1999/_goRPC_
Go接受连接但不产生任何结果:
curl: (52) Empty reply from server
这是我的Go语言代码:
package main
import (
"log"
"os"
"time"
"net"
"net/rpc"
"net/rpc/jsonrpc"
)
// RPC Api structure
type Test struct {}
// Greet method arguments
type GreetArgs struct {
Name string
}
// Grret message accept object with single param Name
func (test *Test) Greet(args *GreetArgs, result *string) (error) {
*result = "Hello " + args.Name
return nil
}
// Start server with Test instance as a service
func startServer(ch chan<- bool, port string) {
test := new(Test)
server := rpc.NewServer()
server.Register(test)
listener, err := net.Listen("tcp", ":" + port)
if err != nil {
log.Fatal("listen error:", err)
}
defer listener.Close()
for {
conn, err := listener.Accept()
if err != nil {
log.Fatal(err)
}
go server.ServeCodec(jsonrpc.NewServerCodec(conn))
ch <- true
}
}
// Start client and call Test.Greet method
func startClient(port string) {
conn, err := net.Dial("tcp", ":" + port)
if err != nil {
panic(err)
}
defer conn.Close()
c := jsonrpc.NewClient(conn)
var reply string
var args = GreetArgs{"world"}
err = c.Call("Test.Greet", args, &reply)
if err != nil {
log.Fatal("arith error:", err)
}
log.Println("Result: ", reply)
}
func main() {
if len(os.Args) < 2 {
log.Fatal("port not specified")
}
port := os.Args[1]
ch := make(chan bool)
go startServer(ch, port)
time.Sleep(500 * time.Millisecond)
go startClient(port)
// Produce log message each time connection closes
for {
<-ch
log.Println("Closed")
}
}
go get github.com/gorilla/rpc/json
来安装它。更多详情请查看这里。 - jfly