Wait for events with poll interval after finished event received (kna…

…tive#7668) (knative#530)

* Wait for events with poll interval after finished event received (knative#7668)

* Wait for events with poll interval after finished event received

* Use PollUntilContextCancel

* Change default timeout to 30 seconds

* Call cancel

* Simplify

* Use wait.PollImmediate

The function PollUntilContextTimeout is not yet available in
k8s.io/apimachinery v0.26.5

test/upgrade/prober/wathola/config/defaults.go

@@ -56,7 +56,8 @@ func defaultValues() *Config {
 		Receiver: ReceiverConfig{
 			Port: port,
 			Teardown: ReceiverTeardownConfig{
-				Duration: 3 * time.Second,
+				Duration: 60 * time.Second,
+				Interval: 1 * time.Second,
 			},
 			Progress: ReceiverProgressConfig{
 				Duration: time.Second,

test/upgrade/prober/wathola/config/defaults_test.go

@@ -26,4 +26,7 @@ func TestDefaultValues(t *testing.T) {
 	assert.Condition(t, func() (success bool) {
 		return Instance.Receiver.Teardown.Duration.Seconds() >= 1
 	})
+	assert.Condition(t, func() (success bool) {
+		return Instance.Receiver.Teardown.Interval.Seconds() >= 1
+	})
 }

test/upgrade/prober/wathola/config/structure.go

@@ -23,6 +23,7 @@ import (
 // ReceiverTeardownConfig holds config receiver teardown
 type ReceiverTeardownConfig struct {
 	Duration time.Duration
+	Interval time.Duration
 }
 
 // ReceiverProgressConfig holds config receiver progress reporting

test/upgrade/prober/wathola/event/services.go

@@ -20,6 +20,7 @@ import (
 	"sync"
 	"time"
 
+	"k8s.io/apimachinery/pkg/util/wait"
 	"knative.dev/eventing/test/upgrade/prober/wathola/config"
 )
 
@@ -104,23 +105,26 @@ func (f *finishedStore) RegisterFinished(finished *Finished) {
 	f.eventsSent = finished.EventsSent
 	f.totalRequests = finished.TotalRequests
 	log.Infof("finish event received, expecting %d event ware propagated", finished.EventsSent)
-	d := config.Instance.Receiver.Teardown.Duration
-	log.Infof("waiting additional %v to be sure all events came", d)
-	time.Sleep(d)
-	receivedEvents := f.steps.Count()
-
-	if receivedEvents != finished.EventsSent &&
-		// If sending was interrupted, tolerate one more received
-		// event as there's no way to check if the last event is delivered or not.
-		!(finished.SendingInterrupted && receivedEvents == finished.EventsSent+1) {
+	timeout := config.Instance.Receiver.Teardown.Duration
+	interval := config.Instance.Receiver.Teardown.Interval
+
+	log.Infof("waiting additional %v to be sure all events came", timeout)
+
+	if err := wait.PollImmediate(interval, timeout, func() (bool, error) {
+		return f.steps.Count() == finished.EventsSent ||
+			// If sending was interrupted, tolerate one more received
+			// event as there's no way to check if the last event is delivered or not.
+			(finished.SendingInterrupted && f.steps.Count() == finished.EventsSent+1), nil
+	}); err != nil {
 		f.errors.throwUnexpected("expecting to have %v unique events received, "+
-			"but received %v unique events", finished.EventsSent, receivedEvents)
+			"but received %v unique events", finished.EventsSent, f.steps.Count())
 		f.reportViolations(finished)
 		f.errors.state = Failed
 	} else {
-		log.Infof("properly received %d unique events", receivedEvents)
+		log.Infof("properly received %d unique events", f.steps.Count())
 		f.errors.state = Success
 	}
+
 	// check down time
 	for _, unavailablePeriod := range finished.UnavailablePeriods {
 		if unavailablePeriod.Period > config.Instance.Receiver.Errors.UnavailablePeriodToReport {