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115 lines
3.9 KiB
Go
115 lines
3.9 KiB
Go
/*
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Copyright 2017 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 apiserver
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import (
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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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"github.com/pborman/uuid"
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"reflect"
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"k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/api/errors"
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"k8s.io/apimachinery/pkg/api/meta"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/types"
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"k8s.io/apiserver/pkg/endpoints/handlers"
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"k8s.io/kubernetes/test/integration/framework"
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)
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// Tests that the apiserver retries non-overlapping conflicts on patches
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func TestPatchConflicts(t *testing.T) {
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s, clientSet, closeFn := setup(t)
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defer closeFn()
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ns := framework.CreateTestingNamespace("status-code", s, t)
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defer framework.DeleteTestingNamespace(ns, s, t)
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// Create the object we're going to conflict on
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clientSet.Core().Secrets(ns.Name).Create(&v1.Secret{
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ObjectMeta: metav1.ObjectMeta{
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Name: "test",
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// Populate annotations so the strategic patch descends, compares, and notices the $patch directive
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Annotations: map[string]string{"initial": "value"},
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},
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})
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client := clientSet.Core().RESTClient()
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successes := int32(0)
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// Run a lot of simultaneous patch operations to exercise internal API server retry of patch application.
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// Internally, a patch API call retries up to MaxRetryWhenPatchConflicts times if the resource version of the object has changed.
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// If the resource version of the object changed between attempts, that means another one of our patch requests succeeded.
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// That means if we run 2*MaxRetryWhenPatchConflicts patch attempts, we should see at least MaxRetryWhenPatchConflicts succeed.
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wg := sync.WaitGroup{}
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for i := 0; i < (2 * handlers.MaxRetryWhenPatchConflicts); i++ {
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wg.Add(1)
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go func(i int) {
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defer wg.Done()
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annotationName := fmt.Sprintf("annotation-%d", i)
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labelName := fmt.Sprintf("label-%d", i)
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value := uuid.NewRandom().String()
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obj, err := client.Patch(types.StrategicMergePatchType).
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Namespace(ns.Name).
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Resource("secrets").
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Name("test").
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Body([]byte(fmt.Sprintf(`{"metadata":{"labels":{"%s":"%s"}, "annotations":{"$patch":"replace","%s":"%s"}}}`, labelName, value, annotationName, value))).
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Do().
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Get()
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if errors.IsConflict(err) {
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t.Logf("tolerated conflict error patching %s: %v", "secrets", err)
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return
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}
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if err != nil {
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t.Errorf("error patching %s: %v", "secrets", err)
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return
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}
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accessor, err := meta.Accessor(obj)
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if err != nil {
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t.Errorf("error getting object from %s: %v", "secrets", err)
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return
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}
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// make sure the label we wanted was effective
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if accessor.GetLabels()[labelName] != value {
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t.Errorf("patch of %s was ineffective, expected %s=%s, got labels %#v", "secrets", labelName, value, accessor.GetLabels())
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return
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}
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// make sure the patch directive didn't get lost, and that the entire annotation map was replaced
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if !reflect.DeepEqual(accessor.GetAnnotations(), map[string]string{annotationName: value}) {
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t.Errorf("patch of %s with $patch directive was ineffective, didn't replace entire annotations map: %#v", "secrets", accessor.GetAnnotations())
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}
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atomic.AddInt32(&successes, 1)
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}(i)
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}
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wg.Wait()
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if successes < handlers.MaxRetryWhenPatchConflicts {
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t.Errorf("Expected at least %d successful patches for %s, got %d", handlers.MaxRetryWhenPatchConflicts, "secrets", successes)
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} else {
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t.Logf("Got %d successful patches for %s", successes, "secrets")
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}
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}
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