upower.go

/*
 * Copyright (c) 2013, 2024 Vadim Vygonets <vadik@vygo.net>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

package main

import (
	"time"

	dbus "github.com/godbus/dbus/v5"
)

const (
	upDest    = "org.freedesktop.UPower"
	upPath    = "/org/freedesktop/UPower"
	upIface   = upDest
	upSignal  = "NotifySleep"
	upSigName = upDest + "." + upSignal
	upTest    = upDest + ".SuspendAllowed"
	upFilter  = "type='signal',interface='" + upDest + "',member=" +
		upSignal
)

type UPowerBackend struct{}

func NewUPowerBackend(conn *dbus.Conn) Backend {
	if conn.Object(upDest, upPath).Call(upTest, 0).Err != nil {
		return nil
	}
	return UPowerBackend{}
}

func (UPowerBackend) Name() string   { return "UPower" }
func (UPowerBackend) Filter() string { return upFilter }
func (UPowerBackend) Release() error { return nil }

func (UPowerBackend) Handle(sig *dbus.Signal) (bool, error) {
	if sig.Path != upPath || sig.Name != upSigName {
		return false, ErrDBusSignal
	}
	return true, nil
}

func (UPowerBackend) MaxInhibit() (time.Duration, error) {
	return -1, nil
}