Add controller for garbage collecting secrets

Signed-off-by: Ryan Richard <rrichard@vmware.com>
This commit is contained in:
Margo Crawford 2020-12-10 17:34:05 -08:00 committed by Ryan Richard
parent afd216308b
commit ed9b3ffce5
3 changed files with 383 additions and 0 deletions

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@ -0,0 +1,71 @@
// Copyright 2020 the Pinniped contributors. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
package supervisorstorage
import (
"time"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
corev1informers "k8s.io/client-go/informers/core/v1"
"k8s.io/client-go/kubernetes"
pinnipedcontroller "go.pinniped.dev/internal/controller"
"go.pinniped.dev/internal/controllerlib"
"go.pinniped.dev/internal/crud"
"go.pinniped.dev/internal/plog"
)
type garbageCollectorController struct {
secretInformer corev1informers.SecretInformer
kubeClient kubernetes.Interface
}
func GarbageCollectorController(
kubeClient kubernetes.Interface,
secretInformer corev1informers.SecretInformer,
withInformer pinnipedcontroller.WithInformerOptionFunc,
) controllerlib.Controller {
return controllerlib.New(
controllerlib.Config{
Name: "garbage-collector-controller",
Syncer: &garbageCollectorController{
secretInformer: secretInformer,
kubeClient: kubeClient,
},
},
withInformer(
secretInformer,
pinnipedcontroller.MatchNothingFilter(nil),
controllerlib.InformerOption{},
),
)
}
func (c *garbageCollectorController) Sync(ctx controllerlib.Context) error {
listOfSecrets, err := c.secretInformer.Lister().List(labels.Everything())
if err != nil {
return err
}
for i := range listOfSecrets {
secret := listOfSecrets[i]
s, ok := secret.Annotations[crud.SecretLifetimeAnnotationKey]
if !ok {
continue
}
currentTime := time.Now()
garbageCollectAfterTime, err := time.Parse(time.RFC3339, s)
if err != nil {
plog.WarningErr("could not parse for garbage collection", err, "secretName", secret.Name, "garbageCollectAfter", s)
continue
}
if garbageCollectAfterTime.Before(currentTime) {
err = c.kubeClient.CoreV1().Secrets(secret.Namespace).Delete(ctx.Context, secret.Name, metav1.DeleteOptions{})
if err != nil {
plog.WarningErr("failed to garbage collect value", err, "secretName", secret.Name, "garbageCollectAfter", s)
}
}
}
return nil
}

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@ -0,0 +1,307 @@
// Copyright 2020 the Pinniped contributors. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
package supervisorstorage
import (
"context"
"errors"
"testing"
"time"
"github.com/sclevine/spec"
"github.com/sclevine/spec/report"
"github.com/stretchr/testify/require"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
kubeinformers "k8s.io/client-go/informers"
kubernetesfake "k8s.io/client-go/kubernetes/fake"
kubetesting "k8s.io/client-go/testing"
"go.pinniped.dev/internal/controllerlib"
"go.pinniped.dev/internal/testutil"
)
func TestGarbageCollectorControllerInformerFilters(t *testing.T) {
spec.Run(t, "informer filters", func(t *testing.T, when spec.G, it spec.S) {
var (
r *require.Assertions
observableWithInformerOption *testutil.ObservableWithInformerOption
secretsInformerFilter controllerlib.Filter
)
it.Before(func() {
r = require.New(t)
observableWithInformerOption = testutil.NewObservableWithInformerOption()
secretsInformer := kubeinformers.NewSharedInformerFactory(nil, 0).Core().V1().Secrets()
_ = GarbageCollectorController(
nil,
secretsInformer,
observableWithInformerOption.WithInformer, // make it possible to observe the behavior of the Filters
)
secretsInformerFilter = observableWithInformerOption.GetFilterForInformer(secretsInformer)
})
when("watching Secret objects", func() {
var (
subject controllerlib.Filter
secret, otherSecret *corev1.Secret
)
it.Before(func() {
subject = secretsInformerFilter
secret = &corev1.Secret{ObjectMeta: metav1.ObjectMeta{Name: "any-name", Namespace: "any-namespace"}}
otherSecret = &corev1.Secret{ObjectMeta: metav1.ObjectMeta{Name: "any-other-name", Namespace: "any-other-namespace"}}
})
when("any Secret changes", func() {
it("returns false to avoid triggering the sync function", func() {
r.False(subject.Add(secret))
r.False(subject.Update(secret, otherSecret))
r.False(subject.Update(otherSecret, secret))
r.False(subject.Delete(secret))
})
})
})
}, spec.Parallel(), spec.Report(report.Terminal{}))
}
func TestGarbageCollectorControllerSync(t *testing.T) {
secretsGVR := schema.GroupVersionResource{
Group: "",
Version: "v1",
Resource: "secrets",
}
firstExpiredTime := time.Date(1900, time.January, 1, 1, 0, 0, 0, time.UTC).Format(time.RFC3339)
secondExpiredTime := time.Date(1901, time.January, 1, 1, 0, 0, 0, time.UTC).Format(time.RFC3339)
unexpiredTime := time.Now().Add(time.Hour * 24).UTC().Format(time.RFC3339)
spec.Run(t, "Sync", func(t *testing.T, when spec.G, it spec.S) {
const (
installedInNamespace = "some-namespace"
)
var (
r *require.Assertions
subject controllerlib.Controller
kubeInformerClient *kubernetesfake.Clientset
kubeClient *kubernetesfake.Clientset
kubeInformers kubeinformers.SharedInformerFactory
timeoutContext context.Context
timeoutContextCancel context.CancelFunc
syncContext *controllerlib.Context
)
// Defer starting the informers until the last possible moment so that the
// nested Before's can keep adding things to the informer caches.
var startInformersAndController = func() {
// Set this at the last second to allow for injection of server override.
subject = GarbageCollectorController(
kubeClient,
kubeInformers.Core().V1().Secrets(),
controllerlib.WithInformer,
)
// Set this at the last second to support calling subject.Name().
syncContext = &controllerlib.Context{
Context: timeoutContext,
Name: subject.Name(),
Key: controllerlib.Key{
Namespace: "",
Name: "",
},
}
// Must start informers before calling TestRunSynchronously()
kubeInformers.Start(timeoutContext.Done())
controllerlib.TestRunSynchronously(t, subject)
}
it.Before(func() {
r = require.New(t)
timeoutContext, timeoutContextCancel = context.WithTimeout(context.Background(), time.Second*3)
kubeInformerClient = kubernetesfake.NewSimpleClientset()
kubeClient = kubernetesfake.NewSimpleClientset()
kubeInformers = kubeinformers.NewSharedInformerFactory(kubeInformerClient, 0)
unrelatedSecret := &corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: "some other unrelated secret",
Namespace: installedInNamespace,
},
}
r.NoError(kubeInformerClient.Tracker().Add(unrelatedSecret))
r.NoError(kubeClient.Tracker().Add(unrelatedSecret))
})
it.After(func() {
timeoutContextCancel()
})
when("there are secrets without the garbage-collect-after annotation", func() {
it("does not delete those secrets", func() {
startInformersAndController()
r.NoError(controllerlib.TestSync(t, subject, *syncContext))
require.Empty(t, kubeClient.Actions())
list, err := kubeClient.CoreV1().Secrets(installedInNamespace).List(context.Background(), metav1.ListOptions{})
r.NoError(err)
r.Len(list.Items, 1)
r.Equal("some other unrelated secret", list.Items[0].Name)
})
})
when("there are secrets with the garbage-collect-after annotation", func() {
it.Before(func() {
firstExpiredSecret := &corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: "first expired secret",
Namespace: installedInNamespace,
Annotations: map[string]string{
"storage.pinniped.dev/garbage-collect-after": firstExpiredTime,
},
},
}
r.NoError(kubeInformerClient.Tracker().Add(firstExpiredSecret))
r.NoError(kubeClient.Tracker().Add(firstExpiredSecret))
secondExpiredSecret := &corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: "second expired secret",
Namespace: installedInNamespace,
Annotations: map[string]string{
"storage.pinniped.dev/garbage-collect-after": secondExpiredTime,
},
},
}
r.NoError(kubeInformerClient.Tracker().Add(secondExpiredSecret))
r.NoError(kubeClient.Tracker().Add(secondExpiredSecret))
unexpiredSecret := &corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: "unexpired secret",
Namespace: installedInNamespace,
Annotations: map[string]string{
"storage.pinniped.dev/garbage-collect-after": unexpiredTime,
},
},
}
r.NoError(kubeInformerClient.Tracker().Add(unexpiredSecret))
r.NoError(kubeClient.Tracker().Add(unexpiredSecret))
})
it("should delete any that are past their expiration", func() {
startInformersAndController()
r.NoError(controllerlib.TestSync(t, subject, *syncContext))
r.ElementsMatch(
[]kubetesting.Action{
kubetesting.NewDeleteAction(secretsGVR, installedInNamespace, "first expired secret"),
kubetesting.NewDeleteAction(secretsGVR, installedInNamespace, "second expired secret"),
},
kubeClient.Actions(),
)
list, err := kubeClient.CoreV1().Secrets(installedInNamespace).List(context.Background(), metav1.ListOptions{})
r.NoError(err)
r.Len(list.Items, 2)
r.ElementsMatch([]string{"unexpired secret", "some other unrelated secret"}, []string{list.Items[0].Name, list.Items[1].Name})
})
})
when("there is a secret with a malformed garbage-collect-after date", func() {
it.Before(func() {
malformedSecret := &corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: "malformed secret",
Namespace: installedInNamespace,
Annotations: map[string]string{
"storage.pinniped.dev/garbage-collect-after": "not-a-real-date-string",
},
},
}
r.NoError(kubeInformerClient.Tracker().Add(malformedSecret))
r.NoError(kubeClient.Tracker().Add(malformedSecret))
expiredSecret := &corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: "expired secret",
Namespace: installedInNamespace,
Annotations: map[string]string{
"storage.pinniped.dev/garbage-collect-after": firstExpiredTime,
},
},
}
r.NoError(kubeInformerClient.Tracker().Add(expiredSecret))
r.NoError(kubeClient.Tracker().Add(expiredSecret))
})
it("does not delete that secret", func() {
startInformersAndController()
r.NoError(controllerlib.TestSync(t, subject, *syncContext))
r.ElementsMatch(
[]kubetesting.Action{
kubetesting.NewDeleteAction(secretsGVR, installedInNamespace, "expired secret"),
},
kubeClient.Actions(),
)
list, err := kubeClient.CoreV1().Secrets(installedInNamespace).List(context.Background(), metav1.ListOptions{})
r.NoError(err)
r.Len(list.Items, 2)
r.ElementsMatch([]string{"malformed secret", "some other unrelated secret"}, []string{list.Items[0].Name, list.Items[1].Name})
})
})
when("the delete call fails", func() {
it.Before(func() {
erroringSecret := &corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: "erroring secret",
Namespace: installedInNamespace,
Annotations: map[string]string{
"storage.pinniped.dev/garbage-collect-after": firstExpiredTime,
},
},
}
r.NoError(kubeInformerClient.Tracker().Add(erroringSecret))
r.NoError(kubeClient.Tracker().Add(erroringSecret))
kubeClient.PrependReactor("delete", "secrets", func(action kubetesting.Action) (bool, runtime.Object, error) {
if action.(kubetesting.DeleteActionImpl).Name == "erroring secret" {
return true, nil, errors.New("delete failed: some delete error")
}
return false, nil, nil
})
expiredSecret := &corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: "expired secret",
Namespace: installedInNamespace,
Annotations: map[string]string{
"storage.pinniped.dev/garbage-collect-after": firstExpiredTime,
},
},
}
r.NoError(kubeInformerClient.Tracker().Add(expiredSecret))
r.NoError(kubeClient.Tracker().Add(expiredSecret))
})
it("continues on to delete the next one", func() {
startInformersAndController()
r.NoError(controllerlib.TestSync(t, subject, *syncContext))
r.ElementsMatch(
[]kubetesting.Action{
kubetesting.NewDeleteAction(secretsGVR, installedInNamespace, "erroring secret"),
kubetesting.NewDeleteAction(secretsGVR, installedInNamespace, "expired secret"),
},
kubeClient.Actions(),
)
list, err := kubeClient.CoreV1().Secrets(installedInNamespace).List(context.Background(), metav1.ListOptions{})
r.NoError(err)
r.Len(list.Items, 2)
r.ElementsMatch([]string{"erroring secret", "some other unrelated secret"}, []string{list.Items[0].Name, list.Items[1].Name})
})
})
}, spec.Parallel(), spec.Report(report.Terminal{}))
}

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@ -22,6 +22,11 @@ func MatchAnythingFilter(parentFunc controllerlib.ParentFunc) controllerlib.Filt
return SimpleFilter(func(object metav1.Object) bool { return true }, parentFunc) return SimpleFilter(func(object metav1.Object) bool { return true }, parentFunc)
} }
// MatchNothingFilter returns a controllerlib.Filter that allows no objects.
func MatchNothingFilter(parentFunc controllerlib.ParentFunc) controllerlib.Filter {
return SimpleFilter(func(object metav1.Object) bool { return false }, parentFunc)
}
// SimpleFilter takes a single boolean match function on a metav1.Object and wraps it into a proper controllerlib.Filter. // SimpleFilter takes a single boolean match function on a metav1.Object and wraps it into a proper controllerlib.Filter.
func SimpleFilter(match func(metav1.Object) bool, parentFunc controllerlib.ParentFunc) controllerlib.Filter { func SimpleFilter(match func(metav1.Object) bool, parentFunc controllerlib.ParentFunc) controllerlib.Filter {
return controllerlib.FilterFuncs{ return controllerlib.FilterFuncs{