func (g *CreeperBatteryGuage) reconnect() (ok bool) {
var err error
g.sig, err = device.SignalChanged()
if err != nil {
log.Printf("upower: %v", err)
return false
}
return true
}
// BatteryStateChange implements the BatteryStateNotifier interface.
func (g *CreeperBatteryGuage) BatteryStateChange(notf chan<- struct{}) (stop func()) {
_done := make(chan struct{})
if g.sig == nil {
sig, err := device.SignalChanged()
if err != nil {
close(notf)
return func() {}
}
g.sig = sig
}
go func() {
if !g.reconnect() {
return
}
var relay chan<- struct{}
for {
select {
case s, ok := <-g.sig:
if !ok {
log.Printf("upower: state channel closed")
if g.reconnect() {
continue
}
return
}
if s.Path != g.dev {
continue
}
relay = notf
case relay <- struct{}{}:
relay = nil
case <-_done:
return
}
}
}()
return func() { close(_done) }
}