Add a controller to clean up stale entries in the idpcache.Cache.
Signed-off-by: Matt Moyer <moyerm@vmware.com>
This commit is contained in:
Matt Moyer
parent
acfc5acfb2
commit
75ea0f48d9
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/*
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Copyright 2020 VMware, Inc.
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SPDX-License-Identifier: Apache-2.0
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*/
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// Package webhookcachecleaner implements a controller for garbage collectting webhook IDPs from an IDP cache.
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package webhookcachecleaner
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import (
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"fmt"
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"github.com/go-logr/logr"
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"k8s.io/apimachinery/pkg/labels"
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"k8s.io/klog/v2"
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idpv1alpha1 "github.com/suzerain-io/pinniped/generated/1.19/apis/idp/v1alpha1"
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idpinformers "github.com/suzerain-io/pinniped/generated/1.19/client/informers/externalversions/idp/v1alpha1"
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pinnipedcontroller "github.com/suzerain-io/pinniped/internal/controller"
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"github.com/suzerain-io/pinniped/internal/controller/identityprovider/idpcache"
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"github.com/suzerain-io/pinniped/internal/controllerlib"
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)
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// New instantiates a new controllerlib.Controller which will garbage collect webhooks from the provided Cache.
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func New(cache *idpcache.Cache, webhookIDPs idpinformers.WebhookIdentityProviderInformer, log logr.Logger) controllerlib.Controller {
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return controllerlib.New(
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controllerlib.Config{
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Name: "webhookcachecleaner-controller",
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Syncer: &controller{
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cache: cache,
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webhookIDPs: webhookIDPs,
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log: log.WithName("webhookcachecleaner-controller"),
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},
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},
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controllerlib.WithInformer(
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webhookIDPs,
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pinnipedcontroller.NoOpFilter(),
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controllerlib.InformerOption{},
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),
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)
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}
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type controller struct {
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cache *idpcache.Cache
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webhookIDPs idpinformers.WebhookIdentityProviderInformer
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log logr.Logger
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}
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// Sync implements controllerlib.Syncer.
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func (c *controller) Sync(ctx controllerlib.Context) error {
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webhooks, err := c.webhookIDPs.Lister().List(labels.Everything())
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if err != nil {
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return fmt.Errorf("failed to list WebhookIdentityProviders: %w", err)
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}
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// Index the current webhooks by key.
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webhooksByKey := map[controllerlib.Key]*idpv1alpha1.WebhookIdentityProvider{}
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for _, webhook := range webhooks {
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key := controllerlib.Key{Namespace: webhook.Namespace, Name: webhook.Name}
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webhooksByKey[key] = webhook
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}
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// Delete any entries from the cache which are no longer in the cluster.
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for _, key := range c.cache.Keys() {
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if _, exists := webhooksByKey[key]; !exists {
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c.log.WithValues("idp", klog.KRef(key.Namespace, key.Name)).Info("deleting webhook IDP from cache")
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c.cache.Delete(key)
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}
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}
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return nil
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}
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@ -0,0 +1,128 @@
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/*
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Copyright 2020 VMware, Inc.
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SPDX-License-Identifier: Apache-2.0
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*/
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package webhookcachecleaner
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import (
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"context"
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"testing"
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"time"
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"github.com/stretchr/testify/require"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apiserver/pkg/authentication/authenticator"
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idpv1alpha "github.com/suzerain-io/pinniped/generated/1.19/apis/idp/v1alpha1"
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pinnipedfake "github.com/suzerain-io/pinniped/generated/1.19/client/clientset/versioned/fake"
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pinnipedinformers "github.com/suzerain-io/pinniped/generated/1.19/client/informers/externalversions"
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"github.com/suzerain-io/pinniped/internal/controller/identityprovider/idpcache"
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"github.com/suzerain-io/pinniped/internal/controllerlib"
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"github.com/suzerain-io/pinniped/internal/testutil/testlogger"
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)
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func TestController(t *testing.T) {
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t.Parallel()
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testKey1 := controllerlib.Key{Namespace: "test-namespace", Name: "test-name-one"}
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testKey2 := controllerlib.Key{Namespace: "test-namespace", Name: "test-name-two"}
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tests := []struct {
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name string
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syncKey controllerlib.Key
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webhookIDPs []runtime.Object
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initialCache map[controllerlib.Key]authenticator.Token
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wantErr string
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wantLogs []string
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wantCacheKeys []controllerlib.Key
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}{
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{
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name: "no change",
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syncKey: testKey1,
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initialCache: map[controllerlib.Key]authenticator.Token{testKey1: nil},
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webhookIDPs: []runtime.Object{
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&idpv1alpha.WebhookIdentityProvider{
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ObjectMeta: metav1.ObjectMeta{
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Namespace: testKey1.Namespace,
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Name: testKey1.Name,
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},
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},
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},
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wantCacheKeys: []controllerlib.Key{testKey1},
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},
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{
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name: "IDPs not yet added",
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syncKey: testKey1,
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initialCache: nil,
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webhookIDPs: []runtime.Object{
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&idpv1alpha.WebhookIdentityProvider{
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ObjectMeta: metav1.ObjectMeta{
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Namespace: testKey1.Namespace,
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Name: testKey1.Name,
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},
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},
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&idpv1alpha.WebhookIdentityProvider{
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ObjectMeta: metav1.ObjectMeta{
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Namespace: testKey2.Namespace,
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Name: testKey2.Name,
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},
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},
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},
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wantCacheKeys: []controllerlib.Key{},
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},
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{
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name: "successful cleanup",
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syncKey: testKey1,
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initialCache: map[controllerlib.Key]authenticator.Token{
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testKey1: nil,
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testKey2: nil,
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},
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webhookIDPs: []runtime.Object{
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&idpv1alpha.WebhookIdentityProvider{
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ObjectMeta: metav1.ObjectMeta{
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Namespace: testKey1.Namespace,
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Name: testKey1.Name,
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},
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},
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},
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wantLogs: []string{
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`webhookcachecleaner-controller "level"=0 "msg"="deleting webhook IDP from cache" "idp"={"name":"test-name-two","namespace":"test-namespace"}`,
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},
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wantCacheKeys: []controllerlib.Key{testKey1},
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},
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}
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for _, tt := range tests {
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tt := tt
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t.Run(tt.name, func(t *testing.T) {
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t.Parallel()
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fakeClient := pinnipedfake.NewSimpleClientset(tt.webhookIDPs...)
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informers := pinnipedinformers.NewSharedInformerFactory(fakeClient, 0)
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cache := idpcache.New()
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for k, v := range tt.initialCache {
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cache.Store(k, v)
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}
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testLog := testlogger.New(t)
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controller := New(cache, informers.IDP().V1alpha1().WebhookIdentityProviders(), testLog)
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ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
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defer cancel()
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informers.Start(ctx.Done())
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controllerlib.TestRunSynchronously(t, controller)
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syncCtx := controllerlib.Context{Context: ctx, Key: tt.syncKey}
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if err := controllerlib.TestSync(t, controller, syncCtx); tt.wantErr != "" {
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require.EqualError(t, err, tt.wantErr)
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} else {
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require.NoError(t, err)
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}
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require.Equal(t, tt.wantLogs, testLog.Lines())
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require.ElementsMatch(t, tt.wantCacheKeys, cache.Keys())
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})
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}
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}
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