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141 lines
3.9 KiB
141 lines
3.9 KiB
#!/usr/bin/env python2.7
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# -*- coding: utf-8 -*-
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"""
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Author: Zhang Yueqian zhangyueqian@antiy.cn
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Date: 2022-10-31 11:20:48
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LastEditors: Zhang Yueqian zhangyueqian@antiy.cn
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LastEditTime: 2022-10-31 11:34:00
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FilePath: /screensaver/backend/medr-screensaver-backend.py
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Description: 屏保程序 for MEDR项目. 本文件为后台监控的部分.
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原理: 主要负责实现两部分功能
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1. 通过dbus方法提供开始菜单中的锁屏功能
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2. 通过监听org.gnome.SessionManager.Presence的StatusChanged信号完成自动锁屏功能
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以上两种锁屏通过调用 medr-screensaver-command 来实现, 提供不同的参数 `--session-idle` 和 `--lock`
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另外: 对于锁屏情况下的黑屏时长, 需要控制lightdm配置实现, 参考
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https://askubuntu.com/questions/403859/how-to-control-lightdm-power-saving-preferences
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利用额外的文件 /var/run/medr-lightdm 来设置
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"""
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from datetime import datetime
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import threading
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from time import sleep
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import dbus
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import dbus.service
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import dbus.glib
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import os
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import gi
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gi.require_version("Gtk", "3.0")
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from gi.repository import GObject, Gio
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BUS_NAME = "org.ukui.ScreenSaver"
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TIMEOUT_FILE = "/var/run/medr-lightdm"
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LOCK_FILE = "/var/run/medr-lightdm-lock"
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DEFAULT_TIMEOUT = 10
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class Service(dbus.service.Object):
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"""锁屏dbus服务"""
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def __init__(self, bus_name, obj_path):
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"""使用bus_name和obj_path初始化dbus服务
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Args:
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bus_name (dbus.service.BusName): 要注册的bus名
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obj_path (str): 要注册的路径
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"""
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dbus.service.Object.__init__(self, bus_name, obj_path)
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self._locked = False
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@dbus.service.method(BUS_NAME, in_signature="", out_signature="b")
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def GetLockState(self):
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print("GetLockState: %s" % self._locked)
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return self._locked
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@dbus.service.method(BUS_NAME, in_signature="b", out_signature="")
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def SetLockState(self, state):
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print("SetLockState: %s" % state)
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self._locked = state
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@dbus.service.method(BUS_NAME, in_signature="", out_signature="")
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def Lock(self):
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print("Lock")
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self._locked = True
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os.system("ukui-screensaver-dialog --lock")
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@dbus.service.method(BUS_NAME, in_signature="", out_signature="")
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def Quit(self):
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self._loop.quit()
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@dbus.service.signal(BUS_NAME)
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def SessionIdle(self):
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os.system("ukui-screensaver-dialog --session-idle")
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loop = GObject.MainLoop()
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bus = dbus.SessionBus()
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bus_name = dbus.service.BusName(BUS_NAME, bus=bus)
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service = Service(bus_name, "/")
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def isLocked():
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"""确认当前是否是锁定状态.
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Returns:
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boolean: 是否锁定.
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"""
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if not os.path.exists(LOCK_FILE):
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return False
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status = ""
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with open(LOCK_FILE, "r") as fp:
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status = fp.readline().strip()
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if len(status) != 0 and status == "done":
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return True
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return False
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def sessionStatusChanged(sessionStatus):
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print("---- Caught signal of status %s ----" % sessionStatus)
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if sessionStatus == 3 and (not isLocked()):
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service.SessionIdle()
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print("\n")
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def checkSessionIdle():
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"""检查gsettings中配置的会话闲置时间并写入到配置文件 TIMEOUT_FILE 中"""
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while True:
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mate_session = Gio.Settings("org.mate.session")
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sys_timeout = mate_session.get_value("idle-delay").get_int32()
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with open(TIMEOUT_FILE, "r") as fp:
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try:
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medr_timeout = int(fp.read())
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except ValueError:
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medr_timeout = DEFAULT_TIMEOUT
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if medr_timeout != sys_timeout:
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with open(TIMEOUT_FILE, "w") as fp:
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fp.write("%s" % sys_timeout)
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sleep(5)
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t = threading.Thread(target=checkSessionIdle)
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if __name__ == "__main__":
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bus.add_signal_receiver(
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sessionStatusChanged, dbus_interface="org.gnome.SessionManager.Presence", signal_name="StatusChanged"
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)
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# org.gnome.SessionManager.Presence:StatusChanged
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t.start()
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loop.run()
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