func qnotify(client *clients.Client, args []string) (interface{}, error) {
timeout, err := parseInt(args[0], "timeout")
if err != nil {
return err, nil
}
// ensure the NotifyCh is empty before waiting
queueName := ""
client.DrainNotifyCh()
// check to see if we have any events in the registered queues. We check the
// list in a randomized order since very active queues in the list may not
// ever let us check after them in the list, abandoning the rest of the list
queueNames := client.Queues
for _, i := range rand.Perm(len(queueNames)) {
unclaimedKey := db.UnclaimedKey(queueNames[i])
var unclaimedCount int
unclaimedCount, err = db.Inst.Cmd("LLEN", unclaimedKey).Int()
if err != nil {
return nil, fmt.Errorf("QNOTIFY LLEN unclaimed): %s", err)
}
if unclaimedCount > 0 {
queueName = queueNames[i]
break
}
}
if queueName == "" {
select {
case <-time.After(time.Duration(timeout) * time.Second):
case queueName = <-client.NotifyCh:
}
}
if queueName != "" {
return queueName, nil
}
return nil, nil
}
