在 go 中导出 dbus 接口似乎无法按预期工作

Question

首先向阅读本文的各位问好，

我目前在实现 Go dbus 接口时遇到问题。问题是我正在为方法“Ping”和“Zing”定义一个接口，这似乎有效。但是当我导出它们并想调用它们（通过 d-feet）时，只有最后导出的方法有效。所以对于我的 Opionion，Export 函数一次只导出一个方法并覆盖以前的方法。我也尝试使用 ExportAll 来处理它，但这也不起作用。如果有人对我有想法或提示，那就太好了！

下面是我的源代码：

package main
                                                                                                                                                                  
import (
        "fmt"
        "os"
        "github.com/godbus/dbus"
        "github.com/godbus/dbus/introspect"
)
type ping string

func (p ping) Ping() (string, *dbus.Error) {
        fmt.Println(p)
        return string(p), nil
}

type zing string

func (z zing) Zing() (string, *dbus.Error) {
        fmt.Println(z)
        return string(z), nil
}

func main() {
        conn, err := dbus.ConnectSystemBus()
        if err != nil {
                panic(err)
        }
        replyP, errP := conn.RequestName("test.Ping", dbus.NameFlagDoNotQueue)
        if errP != nil {
                panic(errP)
        }
        if replyP != dbus.RequestNameReplyPrimaryOwner {
                fmt.Fprintln(os.Stderr, "name already taken")
                os.Exit(1)
        }

        z := zing("Zong")
        p := ping("Pong")
        var intro = &introspect.Node{
                //Name: "/",
                Interfaces: []introspect.Interface{
                        introspect.IntrospectData,
                        {
                                Name:    "test.test",
                                Methods: []introspect.Method{
                                        {
                                                Name: "Zing",
                                                Args: []introspect.Arg{
                                                        {"out", "s", "out"},
                                                },
                                        },
                                        {
                                                Name: "Ping",
                                                Args: []introspect.Arg{
                                                        {"out", "s", "out"},
                                                },
                                        },
                                },
                        },
                },
        }

        conn.Export(z, "/", "test.test")
        conn.Export(p, "/", "test.test")

        conn.Export(introspect.NewIntrospectable(intro), "/", "org.freedesktop.DBus.Introspectable")

        fmt.Printf("Listening on %s / %s ...\n", "test.test", "/...")
        select {}
}

Answer 1

关键是，当您有一个带有两个或更多方法的 dbus 接口时，您必须定义一个新的数据类型，然后将其导出。为此，我创建了一个新类型 type ping struct{}。它基本上是一个空结构，所以它可以处理所有事情。新类型发生在通过 dbus 获取调用的 functions/method 的实现中。最后，您必须初始化并将其导出到 dbus p := ping{} 和 conn.Export(p, "/", "test.test").

package main

import (
        "fmt"
        "os"
        "github.com/godbus/dbus"
        "github.com/godbus/dbus/introspect"
)

type ping struct{}

func (z ping) Ping(s string, i uint8) (*dbus.Error) {
        fmt.Println(s, i)
        return nil
}

func (p ping) Zing(t string) (*dbus.Error) {
        fmt.Println(t)
        return nil
}

func main() {
        conn, err := dbus.ConnectSystemBus()
        if err != nil {
                panic(err)
        }
        replyP, errP := conn.RequestName("test.Ping", dbus.NameFlagDoNotQueue)
        if errP != nil {
                panic(errP)
        }
        if replyP != dbus.RequestNameReplyPrimaryOwner {
                fmt.Fprintln(os.Stderr, "name already taken")
                os.Exit(1)
        }

        p := ping{}
        var intro = &introspect.Node{
                Name: "/",
                Interfaces: []introspect.Interface{
                        introspect.IntrospectData,
                        {
                                Name:    "test.test",
                                Methods: []introspect.Method{
                                        {
                                                Name: "Zing",
                                                Args: []introspect.Arg{
                                                        {"str", "s", "in"},
                                                },
                                        },
                                        {
                                                Name: "Ping",
                                                Args: []introspect.Arg{
                                                        {"str", "s", "in"},
                                                        {"int", "y", "in"},
                                                },
                                        },
                                },
                        },
                },
        }

        conn.Export(p, "/", "test.test")
        conn.Export(introspect.NewIntrospectable(intro), "/", "org.freedesktop.DBus.Introspectable")

        fmt.Printf("Listening on %s / %s \n", "test.test", "/...")
        select {}
}

在 go 中导出 dbus 接口似乎无法按预期工作

Exporting dbus interface in go seems not to work as expected

dbus

go