func updateHostnameProperty(object dbus.BusObject, expectedValue, property, setterName string, apply bool) (checkOK bool, err error) {
propertyObject, err := object.GetProperty("org.freedesktop.hostname1." + property)
if err != nil {
return false, errwrap.Wrapf(err, "failed to get org.freedesktop.hostname1.%s", property)
}
if propertyObject.Value() == nil {
return false, errwrap.Errorf("Unexpected nil value received when reading property %s", property)
}
propertyValue, ok := propertyObject.Value().(string)
if !ok {
return false, fmt.Errorf("Received unexpected type as %s value, expected string got '%T'", property, propertyValue)
}
// expected value and actual value match => checkOk
if propertyValue == expectedValue {
return true, nil
}
// nothing to do anymore
if !apply {
return false, nil
}
// attempting to apply the changes
log.Printf("Changing %s: %s => %s", property, propertyValue, expectedValue)
if err := object.Call("org.freedesktop.hostname1."+setterName, 0, expectedValue, false).Err; err != nil {
return false, errwrap.Wrapf(err, "failed to call org.freedesktop.hostname1.%s", setterName)
}
// all good changes should now be applied again
return false, nil
}
func PrintStatus(obj dbus.BusObject) {
title, err := obj.GetProperty(bus_interface + ".TrackTitle")
if err != nil {
log.Fatalf("Could not retrieve property: %s", err)
}
state, err := obj.GetProperty(bus_interface + ".PlaybackStatus")
if err != nil {
log.Fatalf("Could not retrieve property: %s", err)
}
metadata, err := obj.GetProperty(bus_interface + ".TrackMetadata")
if err != nil {
log.Fatalf("Could not retrieve property: %s", err)
}
length, err := obj.GetProperty(bus_interface + ".TrackLength")
if err != nil {
log.Fatalf("Could not retrieve property: %s", err)
}
var pos, percent float64
obj.Call(bus_interface+".TrackPosition", 0).Store(&pos, &percent)
loop, err := obj.GetProperty(bus_interface + ".LoopStatus")
if err != nil {
log.Fatalf("Could not retrieve property: %s", err)
}
log.Printf("Title: %s\n", title.Value().(string))
log.Printf("Tags:\n")
for key, val := range metadata.Value().(map[string]string) {
log.Printf(" %s: %s\n", key, val)
}
pos_time := time.Duration(int64(pos)) * time.Second
len_time := time.Duration(int64(length.Value().(float64))) * time.Second
log.Printf(
"[%s] %s/%s (%.f%%)\n",
state.Value().(string), pos_time.String(), len_time.String(),
percent,
)
log.Printf("loop: %s\n", loop.Value().(string))
}
func PrintList(obj dbus.BusObject) {
files, err := obj.GetProperty(bus_interface + ".Tracks")
if err != nil {
log.Fatalf("Could not retrieve property: %s", err)
}
current, _ := obj.GetProperty(bus_interface + ".TrackPath")
for i, file := range files.Value().([]string) {
var prefix string
if current.Value() != nil && file == current.Value().(string) {
prefix = "*"
} else {
prefix = " "
}
log.Printf("%s %3d:%s\n", prefix, i, file)
}
}