144 lines
4.6 KiB
Go
144 lines
4.6 KiB
Go
/*
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Copyright 2023 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package cacher
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import (
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"context"
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"sync/atomic"
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"testing"
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"time"
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"k8s.io/apimachinery/pkg/util/wait"
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"k8s.io/klog/v2"
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"k8s.io/klog/v2/ktesting"
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"k8s.io/utils/clock"
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testingclock "k8s.io/utils/clock/testing"
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)
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var (
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pollPeriod = time.Millisecond
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minimalNoChange = 20 * time.Millisecond
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pollTimeout = 5 * time.Second
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)
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func TestConditionalProgressRequester(t *testing.T) {
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_, ctx := ktesting.NewTestContext(t)
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logger := klog.FromContext(ctx)
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clock := testingclock.NewFakeClock(time.Now())
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pr := newTestConditionalProgressRequester(clock)
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stopCh := make(chan struct{})
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go pr.Run(stopCh)
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var wantRequestsSent int32
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var requestsSent int32
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logger.Info("Wait for ticker to be created")
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for !clock.HasWaiters() {
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time.Sleep(pollPeriod)
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}
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logger.Info("No progress requests if no-one is waiting")
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clock.Step(progressRequestPeriod * 2)
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if err := pollConditionNoChange(pollPeriod, minimalNoChange, pollTimeout, func() bool {
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requestsSent = pr.progressRequestsSentCount.Load()
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return requestsSent == wantRequestsSent
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}); err != nil {
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t.Fatalf("Failed to wait progress requests, err: %s, want: %d , got %d", err, wantRequestsSent, requestsSent)
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}
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logger.Info("Adding waiters allows progress request to be sent")
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pr.Add()
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wantRequestsSent++
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if err := pollConditionNoChange(pollPeriod, minimalNoChange, pollTimeout, func() bool {
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requestsSent = pr.progressRequestsSentCount.Load()
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return requestsSent == wantRequestsSent
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}); err != nil {
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t.Fatalf("Failed to wait progress requests, err: %s, want: %d , got %d", err, wantRequestsSent, requestsSent)
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}
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logger.Info("Periodically request progress to be sent every period")
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for wantRequestsSent < 10 {
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clock.Step(progressRequestPeriod)
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wantRequestsSent++
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if err := pollConditionNoChange(pollPeriod, minimalNoChange, pollTimeout, func() bool {
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requestsSent = pr.progressRequestsSentCount.Load()
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return requestsSent == wantRequestsSent
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}); err != nil {
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t.Fatalf("Failed to wait progress requests, err: %s, want: %d , got %d", err, wantRequestsSent, requestsSent)
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}
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}
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pr.Remove()
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logger.Info("No progress requests if no-one is waiting")
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clock.Step(progressRequestPeriod * 2)
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if err := pollConditionNoChange(pollPeriod, minimalNoChange, pollTimeout, func() bool {
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requestsSent = pr.progressRequestsSentCount.Load()
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return requestsSent == wantRequestsSent
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}); err != nil {
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t.Fatalf("Failed to wait progress requests, err: %s, want: %d , got %d", err, wantRequestsSent, requestsSent)
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}
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logger.Info("No progress after stopping")
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close(stopCh)
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if err := pollConditionNoChange(pollPeriod, minimalNoChange, pollTimeout, func() bool {
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requestsSent = pr.progressRequestsSentCount.Load()
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return requestsSent == wantRequestsSent
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}); err != nil {
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t.Fatalf("Failed to wait progress requests, err: %s, want: %d , got %d", err, wantRequestsSent, requestsSent)
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}
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pr.Add()
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clock.Step(progressRequestPeriod * 2)
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if err := pollConditionNoChange(pollPeriod, minimalNoChange, pollTimeout, func() bool {
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requestsSent = pr.progressRequestsSentCount.Load()
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return requestsSent == wantRequestsSent
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}); err != nil {
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t.Fatalf("Failed to wait progress requests, err: %s, want: %d , got %d", err, wantRequestsSent, requestsSent)
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}
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}
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func newTestConditionalProgressRequester(clock clock.WithTicker) *testConditionalProgressRequester {
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pr := &testConditionalProgressRequester{}
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pr.conditionalProgressRequester = newConditionalProgressRequester(pr.RequestWatchProgress, clock, nil)
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return pr
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}
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type testConditionalProgressRequester struct {
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*conditionalProgressRequester
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progressRequestsSentCount atomic.Int32
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}
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func (pr *testConditionalProgressRequester) RequestWatchProgress(ctx context.Context) error {
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pr.progressRequestsSentCount.Add(1)
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return nil
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}
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func pollConditionNoChange(interval, stable, timeout time.Duration, condition func() bool) error {
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passCounter := 0
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requiredNumberOfPasses := int(stable/interval) + 1
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return wait.Poll(interval, timeout, func() (done bool, err error) {
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if condition() {
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passCounter++
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} else {
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passCounter = 0
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}
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return passCounter >= requiredNumberOfPasses, nil
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})
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}
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