如何同时监听D-Bus事件和IPC通道？

Question

我有以下简单代码。它监听 D-Bus 并在创建新作业时执行某些操作。为此，我需要启动 GLib.MainLoop().run()，因为我发现了多个示例。

在执行此操作时，我希望程序持续侦听 IPC 总线并在收到消息时执行某些操作。但显然这不起作用，因为我的程序卡在 GLib.MainLoop().run().

如何实现让我同时收听 D-Bus 和 IPC 的功能？

#!/usr/bin/env python3.4
import asgi_ipc as asgi
from gi.repository import GLib
from pydbus import SystemBus
from systemd.daemon import notify as sd_notify

def main():
    bus = SystemBus()
    systemd = bus.get(".systemd1")
    systemd.onJobNew = do_something_with_job()

    channel_layer = asgi.IPCChannelLayer(prefix="endercp")

    # Notify systemd this unit is ready
    sd_notify("READY=1")

    GLib.MainLoop().run()

    while True:
        message = channel_layer.receive(["endercp"])
        if message is not (None, None):
            do_something_with_message(message)


if __name__ == "__main__":
    # Notify systemd this unit is starting
    sd_notify("STARTING=1")

    main()

    # Notify systemd this unit is stopping
    sd_notify("STOPPING=1")

Answer 1

由于 IPCChannelLayer.receive() 不会阻塞，您可以运行它在空闲回调中。试试这个：

callback_id = GLib.idle_add(GLib.PRIORITY_DEFAULT_IDLE, poll_channel, data=channel_layer)
GLib.MainLoop().run()
GLib.idle_remove_by_data(channel_layer)

# ...

def poll_channel(channel_layer):
    message = channel_layer.receive(["endercp"])
    if message is not (None, None):
        do_something_with_message(message)
    return GLib.SOURCE_CONTINUE

如何同时监听D-Bus事件和IPC通道？

How to listen to D-Bus events and the IPC channel at the same time?

python-3.x

python-3.4

glib

dbus

systemd