Lua:将使用 XML dbus 定义发出消息的 Python 代码翻译成 Lua

Lua: translate a Python code that emits a message using a XML dbus definition into Lua

我在上一个问题的评论中问过这个问题,但我认为最好将它作为一个新的独立问题移到这里。

我正在尝试弄清楚如何使用 lgi DBus 将此 Python 代码转换为将 dbus 信号发射到 Lua:

class DBUSTestInterface(object):
    """
    Server_XML definition.
    Emit / Publish a signal that is a random integer every second 
    type='i' for integer. 
    """
    dbus = """
    <node>
        <interface name="com.test.device.aaa">
            <signal name="get">
                <arg type='s'/>
                <arg type='s'/>
                <arg type='s'/>
                <arg type='s'/>
                <arg type='s'/>
                <arg type='s'/>
                <arg type='s'/>
                <arg type='i'/>
            </signal>
        </interface>
    </node>
    """
    get = signal()

emit = DBUSTestInterface()
bus.publish("com.test.device.get", emit)

我怀疑(完全不确定)它必须向 introspectable 接口发送消息,类似于此:

local object = "/org/freedesktop/DBus"
local interface = "org.freedesktop.DBus.Introspectable"
local method = "Introspect"
local message = Gio.DBusMessage.new_method_call(name, object, interface, method)
message:set_body(GLib.Variant("(aoo)", {{location},session})) -- How do I set the same message as above?

但我不确定,我不知道如何使用 Python 中工作的 XML 设置邮件正文。

如果您能提供一些示例或指出我在哪里可以找到它,我将不胜感激!

谢谢!

呵呵,Google带我看一下https://github.com/pavouk/lgi/issues/220

我觉得您的代码示例无法按原样工作/不是一些独立的 python 代码。因此,我将在文本中进行评论:

Emit / Publish a signal that is a random integer every second

Lua 执行此操作的代码(嗯,除了 "random integer",除非您认为 42 是随机的):

local lgi = require("lgi")
local Gio, GLib, GObject = lgi.Gio, lgi.GLib, lgi.GObject

local conn

GLib.timeout_add_seconds(GLib.PRIORITY_DEFAULT, 1, function()
    if conn then
        conn:emit_signal(nil, "/your/example/has/no/path",
            "com.test.device.aaa", "get",
            GLib.Variant("(sssssssi)", { "what", "are", "all",
            "these", "strings", "for", "?", 42 }))
    end
    return true
end)

local function on_bus_acquire(con)
    conn = con

    local function arg(name, signature)
        return Gio.DBusArgInfo{ name = name, signature = signature }
    end
    local interface_info = Gio.DBusInterfaceInfo {
        name = "com.test.device.aaa",
        signals = {
            Gio.DBusSignalInfo{
                name = "get",
                args = {
                    arg("no_name?!?", "s"),
                    arg("no_name?!?", "s"),
                    arg("no_name?!?", "s"),
                    arg("no_name?!?", "s"),
                    arg("no_name?!?", "s"),
                    arg("no_name?!?", "s"),
                    arg("no_name?!?", "s"),
                    arg("no_name?!?", "i")
                }
            }
        }
    }
    conn:register_object("/your/example/has/no/path", interface_info, nil)
end

Gio.bus_own_name(Gio.BusType.SESSION, "com.test.device.get", Gio.BusNameOwnerFlags.NONE,
    GObject.Closure(on_bus_acquire), nil, nil)

GLib.MainLoop.new():run()