// notify notifies the fact that given event at the given rev just happened to
// watchings that watch on the key of the event.
func (s *watchableStore) notify(rev int64, ev storagepb.Event) {
// check all prefixes of the key to notify all corresponded watchings
for i := 0; i <= len(ev.Kv.Key); i++ {
k := string(ev.Kv.Key[:i])
if wm, ok := s.synced[k]; ok {
for w := range wm {
// the watching needs to be notified when either it watches prefix or
// the key is exactly matched.
if !w.prefix && i != len(ev.Kv.Key) {
continue
}
ev.WatchID = w.id
select {
case w.ch <- ev:
pendingEventsGauge.Inc()
default:
w.cur = rev
s.unsynced[w] = struct{}{}
delete(wm, w)
slowWatchingGauge.Inc()
}
}
}
}
}
