func processDyingEnv(client apiundertaker.UndertakerClient, clock uc.Clock, stopCh <-chan struct{}) error {
// ProcessDyingEnviron will fail quite a few times before it succeeds as
// it is being woken up as every machine or service changes. We ignore the
// error here and rely on the logging inside the ProcessDyingEnviron.
if err := client.ProcessDyingEnviron(); err == nil {
return nil
}
watcher, err := client.WatchEnvironResources()
if err != nil {
return errors.Trace(err)
}
defer watcher.Stop()
for {
select {
case _, ok := <-watcher.Changes():
if !ok {
return watcher.Err()
}
err := client.ProcessDyingEnviron()
if err != nil {
// Yes, we ignore the error. See comment above.
continue
}
return nil
case <-stopCh:
return tomb.ErrDying
}
}
}
