mirror of https://github.com/knative/pkg.git
141 lines
3.4 KiB
Go
141 lines
3.4 KiB
Go
/*
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Copyright 2018 The Knative 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 duck
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import (
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"context"
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"fmt"
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"sync"
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"sync/atomic"
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"testing"
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"time"
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"golang.org/x/sync/errgroup"
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"k8s.io/apimachinery/pkg/runtime/schema"
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"k8s.io/client-go/tools/cache"
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)
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type BlockingInformerFactory struct {
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lock sync.Mutex
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getting int32
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}
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var _ InformerFactory = (*BlockingInformerFactory)(nil)
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func (bif *BlockingInformerFactory) Get(gvr schema.GroupVersionResource) (cache.SharedIndexInformer, cache.GenericLister, error) {
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atomic.AddInt32(&bif.getting, 1)
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// Wait here until we can acquire the lock!
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bif.lock.Lock()
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bif.lock.Unlock()
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return nil, nil, nil
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}
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func TestSameGVR(t *testing.T) {
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bif := &BlockingInformerFactory{}
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// Suspend progress.
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bif.lock.Lock()
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cif := &CachedInformerFactory{
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Delegate: bif,
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}
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grp, _ := errgroup.WithContext(context.TODO())
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returned := int32(0)
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// Use the same GVR each iteration to ensure we hit the cache
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// and don't initialize too many InformerFactory's thru our
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// Delegate.
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gvr := schema.GroupVersionResource{
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Group: "testing.knative.dev",
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Version: "v3",
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Resource: "caches",
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}
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for i := 0; i < 10; i++ {
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grp.Go(func() error {
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_, _, err := cif.Get(gvr)
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atomic.AddInt32(&returned, 1)
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return err
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})
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}
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// Give the goroutines time to make progress.
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time.Sleep(100 * time.Millisecond)
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// Check that none have returned and we have one Get in progress.
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if got, want := atomic.LoadInt32(&returned), int32(0); got != want {
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t.Errorf("Got %v returned, wanted %v", got, want)
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}
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if got, want := atomic.LoadInt32(&bif.getting), int32(1); got != want {
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t.Errorf("Got %v calls to bif.Get, wanted %v", got, want)
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}
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// Allow the Get calls to proceed.
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bif.lock.Unlock()
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if err := grp.Wait(); err != nil {
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t.Errorf("Wait() = %v", err)
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}
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}
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func TestDifferentGVRs(t *testing.T) {
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bif := &BlockingInformerFactory{}
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// Suspend progress.
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bif.lock.Lock()
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cif := &CachedInformerFactory{
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Delegate: bif,
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}
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grp, _ := errgroup.WithContext(context.TODO())
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returned := int32(0)
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for i := 0; i < 10; i++ {
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// Use a different GVR each iteration to check that calls
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// to bif.Get can proceed even if a call is in progress
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// for another GVR.
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gvr := schema.GroupVersionResource{
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Group: "testing.knative.dev",
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Version: fmt.Sprintf("v%d", i),
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Resource: "caches",
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}
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grp.Go(func() error {
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_, _, err := cif.Get(gvr)
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atomic.AddInt32(&returned, 1)
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return err
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})
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}
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// Give the goroutines time to make progress.
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time.Sleep(100 * time.Millisecond)
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// Check that none have returned and we have 10 Gets in progress.
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if got, want := atomic.LoadInt32(&returned), int32(0); got != want {
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t.Errorf("Got %v returned, wanted %v", got, want)
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}
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if got, want := atomic.LoadInt32(&bif.getting), int32(10); got != want {
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t.Errorf("Got %v calls to bif.Get, wanted %v", got, want)
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}
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// Allow the Get calls to proceed.
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bif.lock.Unlock()
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if err := grp.Wait(); err != nil {
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t.Errorf("Wait() = %v", err)
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}
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}
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