编码方式为 protocol.SerializeNone时调用异常

[shinxiang]

我想实现的目的是， 不使用序列化，直接传递 []byte 数据流，代码如下： server.go

type Arith struct{}

func (t *Arith) Echo(ctx context.Context, args []byte, reply *[]byte) error {
    copy(*reply, args)
    log.Printf("%v, %v", args, reply)
    return nil
}

func main() {
    s := server.NewServer()
    s.RegisterName("Arith", new(Arith), "weight=3")
    s.Serve("tcp", "localhost:8972")
}

client.go

func main() {
    d, _ := client.NewPeer2PeerDiscovery("tcp@localhost:8972", "")
    option := client.DefaultOption
    option.SerializeType = protocol.SerializeNone
    xclient := client.NewXClient("Arith", client.Failtry, client.RandomSelect, d, option)
    defer xclient.Close()

    args := []byte{0x00, 0x01, 0x02}
    reply := make([]byte, 0)
    xclient.Call(context.Background(), "Echo", args, &reply)
    log.Printf("%v, %v", args, reply)
}

server.go代码调试时 Echo函数参数reply 为nil

[smallnest]

copy内建函数使用时，要求dst必须预分配足够的容量，比如：

[shinxiang]

按你的建议，更正server.go代码

func (t *Arith) Echo(ctx context.Context, args []byte, reply *[]byte) error {
    *reply = make([]byte, 1024)
    n := copy(*reply, args)
    *reply = (*reply)[:n]
    return nil
}

依然报错，信息如下：

panic: reflect: reflect.Value.SetBytes using unaddressable value

goroutine 46 [running]:
reflect.flag.mustBeAssignableSlow(0x97)
        C:/Program Files/Go/src/reflect/value.go:262 +0xbd
reflect.flag.mustBeAssignable(0x97)
        C:/Program Files/Go/src/reflect/value.go:249 +0x4e
reflect.Value.SetBytes({0x1351a20, 0xc0000094e8, 0x97}, {0xc000374158, 0x3, 0x3})
        C:/Program Files/Go/src/reflect/value.go:2259 +0x3e
github.com/smallnest/rpcx/codec.ByteCodec.Decode({}, {0xc000374158, 0x3, 0x3}, {0x1351a20, 0xc0000094e8})
        C:/Users/Admin/go/pkg/mod/github.com/smallnest/rpcx@v1.8.11/codec/codec.go:42 +0x9b
github.com/smallnest/rpcx/client.(*Client).input(0xc00015a620)
        C:/Users/Admin/go/pkg/mod/github.com/smallnest/rpcx@v1.8.11/client/client.go:694 +0xbc4
created by github.com/smallnest/rpcx/client.(*Client).Connect
        C:/Users/Admin/go/pkg/mod/github.com/smallnest/rpcx@v1.8.11/client/connection.go:70 +0x94c

[smallnest]

看日志是你的client端代码调用的时候使用unaddressable值

[smallnest]

如果你是按照你最开始代码修改的，是没问题的，我测试过

[shinxiang]

问题已经解决了，谢谢！