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Code Activity

feat(ctrl): implement creationPolicy=Merge/None

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This commit is contained in:
Moritz Johner 2021-07-10 21:07:09 +02:00
parent cdae290e5f
commit 59a851c941
5 changed files with 227 additions and 23 deletions
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1
apis/externalsecrets/v1alpha1/externalsecret_types.go
View file

@ -97,6 +97,7 @@ type ExternalSecretTarget struct {
// CreationPolicy defines rules on how to create the resulting Secret
// Defaults to 'Owner'
// +optional
// +kubebuilder:default="Owner"
CreationPolicy ExternalSecretCreationPolicy `json:"creationPolicy,omitempty"`
// Template defines a blueprint for the created Secret resource.

1
deploy/crds/external-secrets.io_externalsecrets.yaml
View file

@ -125,6 +125,7 @@ spec:
be created There can be only one target per ExternalSecret.
properties:
creationPolicy:
default: Owner
description: CreationPolicy defines rules on how to create the
resulting Secret Defaults to 'Owner'
type: string

111
pkg/controllers/externalsecret/externalsecret_controller.go
View file

@ -45,6 +45,27 @@ import (
const (
requeueAfter = time.Second * 30
errGetES = "could not get ExternalSecret"
errReconcileES = "could not reconcile ExternalSecret"
errPatchStatus = "unable to patch status"
errGetSecretStore = "could not get SecretStore %q, %w"
errGetClusterSecretStore = "could not get ClusterSecretStore %q, %w"
errStoreRef = "could not get store reference"
errStoreProvider = "could not get store provider"
errStoreClient = "could not get provider client"
errSetCtrlReference = "could not set ExternalSecret controller reference: %w"
errFetchTplFrom = "error fetching templateFrom data: %w"
errGetSecretData = "could not get secret data from provider: %w"
errExecTpl = "could not execute template: %w"
errPolicyMergeNotFound = "the desired secret %s was not found. With creationPolicy=Merge the secret won't be created"
errPolicyMergeGetSecret = "unable to get secret %s: %w"
errPolicyMergeMutate = "unable to mutate secret %s: %w"
errPolicyMergePatch = "unable to patch secret %s: %w"
errGetSecretKey = "key %q from ExternalSecret %q: %w"
errClientClose = "error closing the connection: %w"
errTplCMMissingKey = "error in configmap %s: missing key %s"
errTplSecMissingKey = "error in secret %s: missing key %s"
)
// Reconciler reconciles a ExternalSecret object.
@ -70,7 +91,7 @@ func (r *Reconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Resu
syncCallsTotal.With(syncCallsMetricLabels).Inc()
return ctrl.Result{}, nil
} else if err != nil {
log.Error(err, "could not get ExternalSecret")
log.Error(err, errGetES)
syncCallsError.With(syncCallsMetricLabels).Inc()
return ctrl.Result{}, nil
}
@ -80,13 +101,13 @@ func (r *Reconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Resu
defer func() {
err = r.Status().Patch(ctx, &externalSecret, p)
if err != nil {
log.Error(err, "unable to patch status")
log.Error(err, errPatchStatus)
}
}()
store, err := r.getStore(ctx, &externalSecret)
if err != nil {
log.Error(err, "could not get store reference")
log.Error(err, errStoreRef)
conditionSynced := NewExternalSecretCondition(esv1alpha1.ExternalSecretReady, v1.ConditionFalse, esv1alpha1.ConditionReasonSecretSyncedError, err.Error())
SetExternalSecretCondition(&externalSecret, *conditionSynced)
syncCallsError.With(syncCallsMetricLabels).Inc()
@ -103,14 +124,14 @@ func (r *Reconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Resu
storeProvider, err := schema.GetProvider(store)
if err != nil {
log.Error(err, "could not get store provider")
log.Error(err, errStoreProvider)
syncCallsError.With(syncCallsMetricLabels).Inc()
return ctrl.Result{RequeueAfter: requeueAfter}, nil
}
secretClient, err := storeProvider.NewClient(ctx, store, r.Client, req.Namespace)
if err != nil {
log.Error(err, "could not get provider client")
log.Error(err, errStoreClient)
conditionSynced := NewExternalSecretCondition(esv1alpha1.ExternalSecretReady, v1.ConditionFalse, esv1alpha1.ConditionReasonSecretSyncedError, err.Error())
SetExternalSecretCondition(&externalSecret, *conditionSynced)
syncCallsError.With(syncCallsMetricLabels).Inc()
@ -138,10 +159,13 @@ func (r *Reconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Resu
},
Data: make(map[string][]byte),
}
_, err = ctrl.CreateOrUpdate(ctx, r.Client, secret, func() error {
err = controllerutil.SetControllerReference(&externalSecret, &secret.ObjectMeta, r.Scheme)
if err != nil {
return fmt.Errorf("could not set ExternalSecret controller reference: %w", err)
mutationFunc := func() error {
if externalSecret.Spec.Target.CreationPolicy == esv1alpha1.Owner {
err = controllerutil.SetControllerReference(&externalSecret, &secret.ObjectMeta, r.Scheme)
if err != nil {
return fmt.Errorf(errSetCtrlReference, err)
}
}
mergeMetadata(secret, externalSecret)
var tplMap map[string][]byte
@ -150,7 +174,7 @@ func (r *Reconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Resu
// get data
dataMap, err = r.getProviderSecretData(ctx, secretClient, &externalSecret)
if err != nil {
return fmt.Errorf("could not get secret data from provider: %w", err)
return fmt.Errorf(errGetSecretData, err)
}
// no template: copy data and return
@ -164,7 +188,7 @@ func (r *Reconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Resu
// template: fetch & execute templates
tplMap, err = r.getTemplateData(ctx, &externalSecret)
if err != nil {
return fmt.Errorf("error fetching templateFrom data: %w", err)
return fmt.Errorf(errFetchTplFrom, err)
}
// override templateFrom data with template data
for k, v := range externalSecret.Spec.Target.Template.Data {
@ -174,13 +198,24 @@ func (r *Reconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Resu
log.V(1).Info("found template data", "tpl_data", tplMap)
err = template.Execute(tplMap, dataMap, secret)
if err != nil {
return fmt.Errorf("could not execute template: %w", err)
return fmt.Errorf(errExecTpl, err)
}
return nil
})
}
//nolint
switch externalSecret.Spec.Target.CreationPolicy {
case esv1alpha1.Merge:
err = patchSecret(ctx, r.Client, r.Scheme, secret, mutationFunc)
case esv1alpha1.None:
log.V(1).Info("secret creation skipped due to creationPolicy=None")
err = nil
default:
_, err = ctrl.CreateOrUpdate(ctx, r.Client, secret, mutationFunc)
}
if err != nil {
log.Error(err, "could not reconcile ExternalSecret")
log.Error(err, errReconcileES)
conditionSynced := NewExternalSecretCondition(esv1alpha1.ExternalSecretReady, v1.ConditionFalse, esv1alpha1.ConditionReasonSecretSyncedError, err.Error())
SetExternalSecretCondition(&externalSecret, *conditionSynced)
syncCallsError.With(syncCallsMetricLabels).Inc()
@ -199,6 +234,40 @@ func (r *Reconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Resu
}, nil
}
func patchSecret(ctx context.Context, c client.Client, scheme *runtime.Scheme, secret *v1.Secret, mutationFunc func() error) error {
err := c.Get(ctx, client.ObjectKeyFromObject(secret), secret.DeepCopy())
if apierrors.IsNotFound(err) {
return fmt.Errorf(errPolicyMergeNotFound, secret.Name)
}
if err != nil {
return fmt.Errorf(errPolicyMergeGetSecret, secret.Name, err)
}
err = mutationFunc()
if err != nil {
return fmt.Errorf(errPolicyMergeMutate, secret.Name, err)
}
// GVK is missing in the Secret, see:
// https://github.com/kubernetes-sigs/controller-runtime/issues/526
// https://github.com/kubernetes-sigs/controller-runtime/issues/1517
// https://github.com/kubernetes/kubernetes/issues/80609
// we need to manually set it befor doing a Patch() as it depends on the GVK
gvks, unversioned, err := scheme.ObjectKinds(secret)
if err != nil {
return err
}
if !unversioned && len(gvks) == 1 {
secret.SetGroupVersionKind(gvks[0])
}
// we might get into a conflict here if we are not the manager of that particular field
// we do not resolve the conflict and return an error instead
// see: https://kubernetes.io/docs/reference/using-api/server-side-apply/#conflicts
err = c.Patch(ctx, secret, client.Apply, client.FieldOwner("external-secrets"))
if err != nil {
return fmt.Errorf(errPolicyMergePatch, secret.Name, err)
}
return nil
}
// shouldProcessStore returns true if the store should be processed.
func shouldProcessStore(store esv1alpha1.GenericStore, class string) bool {
if store.GetSpec().Controller == "" || store.GetSpec().Controller == class {
@ -269,7 +338,7 @@ func (r *Reconciler) getStore(ctx context.Context, externalSecret *esv1alpha1.Ex
var store esv1alpha1.ClusterSecretStore
err := r.Get(ctx, ref, &store)
if err != nil {
return nil, fmt.Errorf("could not get ClusterSecretStore %q, %w", ref.Name, err)
return nil, fmt.Errorf(errGetClusterSecretStore, ref.Name, err)
}
return &store, nil
@ -280,7 +349,7 @@ func (r *Reconciler) getStore(ctx context.Context, externalSecret *esv1alpha1.Ex
var store esv1alpha1.SecretStore
err := r.Get(ctx, ref, &store)
if err != nil {
return nil, fmt.Errorf("could not get SecretStore %q, %w", ref.Name, err)
return nil, fmt.Errorf(errGetSecretStore, ref.Name, err)
}
return &store, nil
}
@ -292,7 +361,7 @@ func (r *Reconciler) getProviderSecretData(ctx context.Context, providerClient p
for _, remoteRef := range externalSecret.Spec.DataFrom {
secretMap, err := providerClient.GetSecretMap(ctx, remoteRef)
if err != nil {
return nil, fmt.Errorf("key %q from ExternalSecret %q: %w", remoteRef.Key, externalSecret.Name, err)
return nil, fmt.Errorf(errGetSecretKey, remoteRef.Key, externalSecret.Name, err)
}
providerData = utils.MergeByteMap(providerData, secretMap)
@ -301,7 +370,7 @@ func (r *Reconciler) getProviderSecretData(ctx context.Context, providerClient p
for _, secretRef := range externalSecret.Spec.Data {
secretData, err := providerClient.GetSecret(ctx, secretRef.RemoteRef)
if err != nil {
return nil, fmt.Errorf("key %q from ExternalSecret %q: %w", secretRef.RemoteRef.Key, externalSecret.Name, err)
return nil, fmt.Errorf(errGetSecretKey, secretRef.RemoteRef.Key, externalSecret.Name, err)
}
providerData[secretRef.SecretKey] = secretData
@ -309,7 +378,7 @@ func (r *Reconciler) getProviderSecretData(ctx context.Context, providerClient p
err := providerClient.Close()
if err != nil {
return nil, fmt.Errorf("error closing the connection: %w", err)
return nil, fmt.Errorf(errClientClose, err)
}
return providerData, nil
@ -333,7 +402,7 @@ func (r *Reconciler) getTemplateData(ctx context.Context, externalSecret *esv1al
for _, k := range tpl.ConfigMap.Items {
val, ok := cm.Data[k.Key]
if !ok {
return nil, fmt.Errorf("error in configmap %s: missing key %s", tpl.ConfigMap.Name, k.Key)
return nil, fmt.Errorf(errTplCMMissingKey, tpl.ConfigMap.Name, k.Key)
}
out[k.Key] = []byte(val)
}
@ -350,7 +419,7 @@ func (r *Reconciler) getTemplateData(ctx context.Context, externalSecret *esv1al
for _, k := range tpl.Secret.Items {
val, ok := sec.Data[k.Key]
if !ok {
return nil, fmt.Errorf("error in secret %s: missing key %s", tpl.Secret.Name, k.Key)
return nil, fmt.Errorf(errTplSecMissingKey, tpl.Secret.Name, k.Key)
}
out[k.Key] = val
}

133
pkg/controllers/externalsecret/externalsecret_controller_test.go
View file

@ -171,6 +171,115 @@ var _ = Describe("ExternalSecret controller", func() {
// check labels & annotations
Expect(secret.ObjectMeta.Labels).To(BeEquivalentTo(es.ObjectMeta.Labels))
Expect(secret.ObjectMeta.Annotations).To(BeEquivalentTo(es.ObjectMeta.Annotations))
// ownerRef must not not be set!
Expect(hasOwnerRef(secret.ObjectMeta, "ExternalSecret", ExternalSecretName)).To(BeTrue())
}
}
// merge with existing secret using creationPolicy=Merge
// it should NOT have a ownerReference
// metadata.managedFields with the correct owner should be added to the secret
mergeWithSecret := func(tc *testCase) {
const secretVal = "someValue"
const existingKey = "pre-existing-key"
existingVal := "pre-existing-value"
tc.externalSecret.Spec.Target.CreationPolicy = esv1alpha1.Merge
// create secret beforehand
Expect(k8sClient.Create(context.Background(), &v1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: "test-secret",
Namespace: ExternalSecretNamespace,
},
Data: map[string][]byte{
existingKey: []byte(existingVal),
},
}, client.FieldOwner("fake.manager"))).To(Succeed())
fakeProvider.WithGetSecret([]byte(secretVal), nil)
tc.checkSecret = func(es *esv1alpha1.ExternalSecret, secret *v1.Secret) {
Expect(externalSecretConditionShouldBe(ExternalSecretName, ExternalSecretNamespace, esv1alpha1.ExternalSecretReady, v1.ConditionFalse, 0.0)).To(BeTrue())
Expect(externalSecretConditionShouldBe(ExternalSecretName, ExternalSecretNamespace, esv1alpha1.ExternalSecretReady, v1.ConditionTrue, 1.0)).To(BeTrue())
Eventually(func() bool {
Expect(syncCallsTotal.WithLabelValues(ExternalSecretName, ExternalSecretNamespace).Write(&metric)).To(Succeed())
return metric.GetCounter().GetValue() == 1.0
}, timeout, interval).Should(BeTrue())
// check value
Expect(string(secret.Data[existingKey])).To(Equal(existingVal))
Expect(string(secret.Data[targetProp])).To(Equal(secretVal))
// check labels & annotations
Expect(secret.ObjectMeta.Labels).To(BeEquivalentTo(es.ObjectMeta.Labels))
Expect(secret.ObjectMeta.Annotations).To(BeEquivalentTo(es.ObjectMeta.Annotations))
Expect(hasOwnerRef(secret.ObjectMeta, "ExternalSecret", ExternalSecretName)).To(BeFalse())
Expect(secret.ObjectMeta.ManagedFields).To(HaveLen(2))
Expect(hasFieldOwnership(secret.ObjectMeta, "external-secrets", "{\"f:data\":{\"f:targetProperty\":{}}}")).To(BeTrue())
Expect(hasFieldOwnership(secret.ObjectMeta, "fake.manager", "{\"f:data\":{\".\":{},\"f:pre-existing-key\":{}},\"f:type\":{}}")).To(BeTrue())
}
}
// should not merge with secret if it doesn't exist
mergeWithSecretErr := func(tc *testCase) {
const secretVal = "someValue"
tc.externalSecret.Spec.Target.CreationPolicy = esv1alpha1.Merge
fakeProvider.WithGetSecret([]byte(secretVal), nil)
tc.checkCondition = func(es *esv1alpha1.ExternalSecret) bool {
cond := GetExternalSecretCondition(es.Status, esv1alpha1.ExternalSecretReady)
if cond == nil || cond.Status != v1.ConditionFalse || cond.Reason != esv1alpha1.ConditionReasonSecretSyncedError {
return false
}
return true
}
tc.checkExternalSecret = func(es *esv1alpha1.ExternalSecret) {
Eventually(func() bool {
Expect(syncCallsError.WithLabelValues(ExternalSecretName, ExternalSecretNamespace).Write(&metric)).To(Succeed())
return metric.GetCounter().GetValue() >= 2.0
}, timeout, interval).Should(BeTrue())
Expect(externalSecretConditionShouldBe(ExternalSecretName, ExternalSecretNamespace, esv1alpha1.ExternalSecretReady, v1.ConditionFalse, 1.0)).To(BeTrue())
Expect(externalSecretConditionShouldBe(ExternalSecretName, ExternalSecretNamespace, esv1alpha1.ExternalSecretReady, v1.ConditionTrue, 0.0)).To(BeTrue())
}
}
// controller should not force override but
// return an error on conflict
mergeWithConflict := func(tc *testCase) {
const secretVal = "someValue"
// this should confict
const existingKey = targetProp
existingVal := "pre-existing-value"
tc.externalSecret.Spec.Target.CreationPolicy = esv1alpha1.Merge
// create secret beforehand
Expect(k8sClient.Create(context.Background(), &v1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: "test-secret",
Namespace: ExternalSecretNamespace,
},
Data: map[string][]byte{
existingKey: []byte(existingVal),
},
}, client.FieldOwner("fake.manager"))).To(Succeed())
fakeProvider.WithGetSecret([]byte(secretVal), nil)
tc.checkCondition = func(es *esv1alpha1.ExternalSecret) bool {
cond := GetExternalSecretCondition(es.Status, esv1alpha1.ExternalSecretReady)
if cond == nil || cond.Status != v1.ConditionFalse || cond.Reason != esv1alpha1.ConditionReasonSecretSyncedError {
return false
}
return true
}
tc.checkSecret = func(es *esv1alpha1.ExternalSecret, secret *v1.Secret) {
// check that value stays the same
Expect(string(secret.Data[existingKey])).To(Equal(existingVal))
Expect(string(secret.Data[targetProp])).ToNot(Equal(secretVal))
// check owner/managedFields
Expect(hasOwnerRef(secret.ObjectMeta, "ExternalSecret", ExternalSecretName)).To(BeFalse())
Expect(secret.ObjectMeta.ManagedFields).To(HaveLen(1))
Expect(hasFieldOwnership(secret.ObjectMeta, "fake.manager", "{\"f:data\":{\".\":{},\"f:targetProperty\":{}},\"f:type\":{}}")).To(BeTrue())
}
}
@ -332,7 +441,6 @@ var _ = Describe("ExternalSecret controller", func() {
if err != nil {
return false
}
fmt.Fprintf(GinkgoWriter, "data: %#v\n", sec.Data)
// ensure new data value exist
return string(sec.Data["new"]) == "value"
}, time.Second*10, time.Millisecond*200).Should(BeTrue())
@ -524,10 +632,12 @@ var _ = Describe("ExternalSecret controller", func() {
tweak(tc)
}
ctx := context.Background()
By("creating a secret store and external secret")
Expect(k8sClient.Create(ctx, tc.secretStore)).To(Succeed())
Expect(k8sClient.Create(ctx, tc.externalSecret)).Should(Succeed())
esKey := types.NamespacedName{Name: ExternalSecretName, Namespace: ExternalSecretNamespace}
createdES := &esv1alpha1.ExternalSecret{}
By("checking the es condition")
Eventually(func() bool {
err := k8sClient.Get(ctx, esKey, createdES)
if err != nil {
@ -552,6 +662,9 @@ var _ = Describe("ExternalSecret controller", func() {
}
},
Entry("should set the condition eventually", syncLabelsAnnotations),
Entry("should merge with existing secret using creationPolicy=Merge", mergeWithSecret),
Entry("should error if sceret doesn't exist when using creationPolicy=Merge", mergeWithSecretErr),
Entry("should not resolve conflicts with creationPolicy=Merge", mergeWithConflict),
Entry("should sync with template", syncWithTemplate),
Entry("should sync template with correct value precedence", syncWithTemplatePrecedence),
Entry("should refresh secret from template", refreshWithTemplate),
@ -762,6 +875,24 @@ func CreateNamespace(baseName string, c client.Client) (string, error) {
return ns.Name, nil
}
func hasOwnerRef(meta metav1.ObjectMeta, kind, name string) bool {
for _, ref := range meta.OwnerReferences {
if ref.Kind == kind && ref.Name == name {
return true
}
}
return false
}
func hasFieldOwnership(meta metav1.ObjectMeta, mgr, rawFields string) bool {
for _, ref := range meta.ManagedFields {
if ref.Manager == mgr && string(ref.FieldsV1.Raw) == rawFields {
return true
}
}
return false
}
func externalSecretConditionShouldBe(name, ns string, ct esv1alpha1.ExternalSecretConditionType, cs v1.ConditionStatus, v float64) bool {
return Eventually(func() float64 {
Expect(externalSecretCondition.WithLabelValues(name, ns, string(ct), string(cs)).Write(&metric)).To(Succeed())

4
pkg/controllers/externalsecret/suite_test.go
View file

@ -20,6 +20,7 @@ import (
. "github.com/onsi/ginkgo"
. "github.com/onsi/gomega"
"go.uber.org/zap/zapcore"
"k8s.io/client-go/kubernetes/scheme"
"k8s.io/client-go/rest"
ctrl "sigs.k8s.io/controller-runtime"
@ -44,7 +45,8 @@ func TestAPIs(t *testing.T) {
}
var _ = BeforeSuite(func() {
log := zap.New(zap.WriteTo(GinkgoWriter))
log := zap.New(zap.WriteTo(GinkgoWriter), zap.Level(zapcore.DebugLevel))
logf.SetLogger(log)
By("bootstrapping test environment")