// FinalSave should be called immediately before exiting, and only before
// exiting, in order to flush tasks to disk. It waits a short timeout for state
// to settle if necessary. If unable to reach a steady-state and save within
// this short timeout, it returns an error
func FinalSave(saver statemanager.Saver, taskEngine engine.TaskEngine) error {
engineDisabled := make(chan error)
disableTimer := time.AfterFunc(engineDisableTimeout, func() {
engineDisabled <- errors.New("Timed out waiting for TaskEngine to settle")
})
go func() {
log.Debug("Shutting down task engine")
taskEngine.Disable()
disableTimer.Stop()
engineDisabled <- nil
}()
disableErr := <-engineDisabled
stateSaved := make(chan error)
saveTimer := time.AfterFunc(finalSaveTimeout, func() {
stateSaved <- errors.New("Timed out trying to save to disk")
})
go func() {
log.Debug("Saving state before shutting down")
stateSaved <- saver.ForceSave()
saveTimer.Stop()
}()
saveErr := <-stateSaved
if disableErr != nil || saveErr != nil {
return utils.NewMultiError(disableErr, saveErr)
}
return nil
}
