func maintainPresence(bbs bbs.ExecutorBBS, ready chan<- bool) error { p, statusChannel, err := bbs.MaintainExecutorPresence(*heartbeatInterval, executorID) if err != nil { ready <- false return err } tasks.Add(1) go func() { for { select { case locked, ok := <-statusChannel: if locked && ready != nil { ready <- true ready = nil } if !locked && ok { tasks.Done() logger.Fatal("maintain.presence.fatal", map[string]interface{}{}) } if !ok { tasks.Done() return } case <-stop: p.Remove() for _ = range statusChannel { } tasks.Done() return } } }() return nil }