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Hold the event source when there are no listeners (#15725)
* Hold the event source when there are no listeners The event source does not need to run when there are no listeners. Therefore pause it when there are none. * add some more logging Signed-off-by: Andrew Thornton <art27@cantab.net>
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@ -13,6 +13,7 @@ type Manager struct {
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mutex sync.Mutex
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messengers map[int64]*Messenger
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connection chan struct{}
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}
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var manager *Manager
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@ -20,6 +21,7 @@ var manager *Manager
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func init() {
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manager = &Manager{
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messengers: make(map[int64]*Messenger),
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connection: make(chan struct{}, 1),
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}
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}
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@ -36,6 +38,10 @@ func (m *Manager) Register(uid int64) <-chan *Event {
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messenger = NewMessenger(uid)
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m.messengers[uid] = messenger
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}
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select {
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case m.connection <- struct{}{}:
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default:
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}
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m.mutex.Unlock()
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return messenger.Register()
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}
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@ -34,6 +34,35 @@ loop:
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timer.Stop()
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break loop
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case <-timer.C:
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m.mutex.Lock()
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connectionCount := len(m.messengers)
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if connectionCount == 0 {
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log.Trace("Event source has no listeners")
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// empty the connection channel
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select {
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case <-m.connection:
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default:
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}
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}
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m.mutex.Unlock()
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if connectionCount == 0 {
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// No listeners so the source can be paused
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log.Trace("Pausing the eventsource")
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select {
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case <-ctx.Done():
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break loop
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case <-m.connection:
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log.Trace("Connection detected - restarting the eventsource")
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// OK we're back so lets reset the timer and start again
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// We won't change the "then" time because there could be concurrency issues
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select {
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case <-timer.C:
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default:
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}
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continue
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}
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}
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now := timeutil.TimeStampNow().Add(-2)
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uidCounts, err := models.GetUIDsAndNotificationCounts(then, now)
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