func (p *processorListener) pop(stopCh <-chan struct{}) {
defer utilruntime.HandleCrash()
for {
blockingGet := func() (interface{}, bool) {
p.lock.Lock()
defer p.lock.Unlock()
for len(p.pendingNotifications) == 0 {
// check if we're shutdown
select {
case <-stopCh:
return nil, true
default:
}
p.cond.Wait()
}
nt := p.pendingNotifications[0]
p.pendingNotifications = p.pendingNotifications[1:]
return nt, false
}
notification, stopped := blockingGet()
if stopped {
return
}
select {
case <-stopCh:
return
case p.nextCh <- notification:
}
}
}
func (p *processorListener) run(stopCh <-chan struct{}) {
defer utilruntime.HandleCrash()
for {
var next interface{}
select {
case <-stopCh:
func() {
p.lock.Lock()
defer p.lock.Unlock()
p.cond.Broadcast()
}()
return
case next = <-p.nextCh:
}
switch notification := next.(type) {
case updateNotification:
p.handler.OnUpdate(notification.oldObj, notification.newObj)
case addNotification:
p.handler.OnAdd(notification.newObj)
case deleteNotification:
p.handler.OnDelete(notification.oldObj)
default:
utilruntime.HandleError(fmt.Errorf("unrecognized notification: %#v", next))
}
}
}
func (s *sharedIndexInformer) Run(stopCh <-chan struct{}) {
defer utilruntime.HandleCrash()
fifo := NewDeltaFIFO(MetaNamespaceKeyFunc, nil, s.indexer)
cfg := &Config{
Queue: fifo,
ListerWatcher: s.listerWatcher,
ObjectType: s.objectType,
FullResyncPeriod: s.fullResyncPeriod,
RetryOnError: false,
Process: s.HandleDeltas,
}
func() {
s.startedLock.Lock()
defer s.startedLock.Unlock()
s.controller = New(cfg)
s.started = true
}()
s.stopCh = stopCh
s.processor.run(stopCh)
s.controller.Run(stopCh)
}
// receive reads result from the decoder in a loop and sends down the result channel.
func (sw *StreamWatcher) receive() {
defer close(sw.result)
defer sw.Stop()
defer utilruntime.HandleCrash()
for {
action, obj, err := sw.source.Decode()
if err != nil {
// Ignore expected error.
if sw.stopping() {
return
}
switch err {
case io.EOF:
// watch closed normally
case io.ErrUnexpectedEOF:
glog.V(1).Infof("Unexpected EOF during watch stream event decoding: %v", err)
default:
msg := "Unable to decode an event from the watch stream: %v"
if net.IsProbableEOF(err) {
glog.V(5).Infof(msg, err)
} else {
glog.Errorf(msg, err)
}
}
return
}
sw.result <- Event{
Type: action,
Object: obj,
}
}
}
// Run begins processing items, and will continue until a value is sent down stopCh.
// It's an error to call Run more than once.
// Run blocks; call via go.
func (c *Controller) Run(stopCh <-chan struct{}) {
defer utilruntime.HandleCrash()
r := NewReflector(
c.config.ListerWatcher,
c.config.ObjectType,
c.config.Queue,
c.config.FullResyncPeriod,
)
c.reflectorMutex.Lock()
c.reflector = r
c.reflectorMutex.Unlock()
r.RunUntil(stopCh)
wait.Until(c.processLoop, time.Second, stopCh)
}
// StartEventWatcher starts sending events received from this EventBroadcaster to the given event handler function.
// The return value can be ignored or used to stop recording, if desired.
func (eventBroadcaster *eventBroadcasterImpl) StartEventWatcher(eventHandler func(*v1.Event)) watch.Interface {
watcher := eventBroadcaster.Watch()
go func() {
defer utilruntime.HandleCrash()
for {
watchEvent, open := <-watcher.ResultChan()
if !open {
return
}
event, ok := watchEvent.Object.(*v1.Event)
if !ok {
// This is all local, so there's no reason this should
// ever happen.
continue
}
eventHandler(event)
}
}()
return watcher
}
func (recorder *recorderImpl) generateEvent(object runtime.Object, timestamp metav1.Time, eventtype, reason, message string) {
ref, err := v1.GetReference(object)
if err != nil {
glog.Errorf("Could not construct reference to: '%#v' due to: '%v'. Will not report event: '%v' '%v' '%v'", object, err, eventtype, reason, message)
return
}
if !validateEventType(eventtype) {
glog.Errorf("Unsupported event type: '%v'", eventtype)
return
}
event := recorder.makeEvent(ref, eventtype, reason, message)
event.Source = recorder.source
go func() {
// NOTE: events should be a non-blocking operation
defer utilruntime.HandleCrash()
recorder.Action(watch.Added, event)
}()
}
// JitterUntil loops until stop channel is closed, running f every period.
//
// If jitterFactor is positive, the period is jittered before every run of f.
// If jitterFactor is not positive, the period is unchanged and not jitterd.
//
// If slidingis true, the period is computed after f runs. If it is false then
// period includes the runtime for f.
//
// Close stopCh to stop. f may not be invoked if stop channel is already
// closed. Pass NeverStop to if you don't want it stop.
func JitterUntil(f func(), period time.Duration, jitterFactor float64, sliding bool, stopCh <-chan struct{}) {
for {
select {
case <-stopCh:
return
default:
}
jitteredPeriod := period
if jitterFactor > 0.0 {
jitteredPeriod = Jitter(period, jitterFactor)
}
var t *time.Timer
if !sliding {
t = time.NewTimer(jitteredPeriod)
}
func() {
defer runtime.HandleCrash()
f()
}()
if sliding {
t = time.NewTimer(jitteredPeriod)
}
// NOTE: b/c there is no priority selection in golang
// it is possible for this to race, meaning we could
// trigger t.C and stopCh, and t.C select falls through.
// In order to mitigate we re-check stopCh at the beginning
// of every loop to prevent extra executions of f().
select {
case <-stopCh:
return
case <-t.C:
}
}
}
