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Unproject workloads no longer targeted by a ServiceBinding
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When a previously bound workload is no longer targeted by a
ServiceBinding it is now unprojected. Previously, the projection was
orphaned as the controller only managed workload matching the reference
on the ServiceBinding resource. This could happen for a few different
reasons:

- the name of the referenced workload was updated on the ServiceBinding
- the label selector matching the workload was updated on the
  ServiceBinding
- the labels on the workload were updated to no longer match the
  selector on the ServiceBinding.

In order to find previously bound workloads, we now list all resources
matching the workload refs GVK in the namespace.  That list is filtered
to resources that are currently projected, or match the new criteria.
All matching workloads are unprojected, but only resources matching the
current ref are re-projected.

To avoid a much larger search area, the workloadRef apiVersion and kind
fields are now immutable. Users who need to update either of these
values will need to delete the ServiceBinding and create a new resource
with the desired values.

Signed-off-by: Scott Andrews <[email protected]>
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@scothis
scothis committed Oct 5, 2023
1 parent 8551c2d commit 6577c91
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Showing 12 changed files with 612 additions and 64 deletions.
165 changes: 165 additions & 0 deletions apis/v1beta1/servicebinding_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -20,7 +20,9 @@ import (
"testing"

"github.com/google/go-cmp/cmp"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/util/validation/field"
)

Expand Down Expand Up @@ -273,3 +275,166 @@ func TestServiceBindingValidate(t *testing.T) {
})
}
}

func TestServiceBindingValidate_Immutable(t *testing.T) {
tests := []struct {
name string
seed *ServiceBinding
old runtime.Object
expected field.ErrorList
}{
{
name: "allow update workload name",
seed: &ServiceBinding{
Spec: ServiceBindingSpec{
Name: "my-binding",
Service: ServiceBindingServiceReference{
APIVersion: "v1",
Kind: "Secret",
Name: "my-service",
},
Workload: ServiceBindingWorkloadReference{
APIVersion: "apps/v1",
Kind: "Deloyment",
Name: "new-workload",
},
},
},
old: &ServiceBinding{
Spec: ServiceBindingSpec{
Name: "my-binding",
Service: ServiceBindingServiceReference{
APIVersion: "v1",
Kind: "Secret",
Name: "my-service",
},
Workload: ServiceBindingWorkloadReference{
APIVersion: "apps/v1",
Kind: "Deloyment",
Name: "old-workload",
},
},
},
expected: field.ErrorList{},
},
{
name: "reject update workload apiVersion",
seed: &ServiceBinding{
Spec: ServiceBindingSpec{
Name: "my-binding",
Service: ServiceBindingServiceReference{
APIVersion: "v1",
Kind: "Secret",
Name: "my-service",
},
Workload: ServiceBindingWorkloadReference{
APIVersion: "apps/v1",
Kind: "Deloyment",
Name: "my-workload",
},
},
},
old: &ServiceBinding{
Spec: ServiceBindingSpec{
Name: "my-binding",
Service: ServiceBindingServiceReference{
APIVersion: "v1",
Kind: "Secret",
Name: "my-service",
},
Workload: ServiceBindingWorkloadReference{
APIVersion: "extensions/v1beta1",
Kind: "Deloyment",
Name: "my-workload",
},
},
},
expected: field.ErrorList{
{
Type: field.ErrorTypeForbidden,
Field: "spec.workload.apiVersion",
Detail: "Workload apiVersion is immutable. Delete and recreate the ServiceBinding to update.",
BadValue: "",
},
},
},
{
name: "reject update workload kind",
seed: &ServiceBinding{
Spec: ServiceBindingSpec{
Name: "my-binding",
Service: ServiceBindingServiceReference{
APIVersion: "v1",
Kind: "Secret",
Name: "my-service",
},
Workload: ServiceBindingWorkloadReference{
APIVersion: "apps/v1",
Kind: "Deloyment",
Name: "my-workload",
},
},
},
old: &ServiceBinding{
Spec: ServiceBindingSpec{
Name: "my-binding",
Service: ServiceBindingServiceReference{
APIVersion: "v1",
Kind: "Secret",
Name: "my-service",
},
Workload: ServiceBindingWorkloadReference{
APIVersion: "apps/v1",
Kind: "StatefulSet",
Name: "my-workload",
},
},
},
expected: field.ErrorList{
{
Type: field.ErrorTypeForbidden,
Field: "spec.workload.kind",
Detail: "Workload kind is immutable. Delete and recreate the ServiceBinding to update.",
BadValue: "",
},
},
},
{
name: "unkonwn old object",
seed: &ServiceBinding{
Spec: ServiceBindingSpec{
Name: "my-binding",
Service: ServiceBindingServiceReference{
APIVersion: "v1",
Kind: "Secret",
Name: "my-service",
},
Workload: ServiceBindingWorkloadReference{
APIVersion: "apps/v1",
Kind: "Deloyment",
Name: "new-workload",
},
},
},
old: &corev1.Pod{},
expected: field.ErrorList{
{
Type: field.ErrorTypeInternal,
Field: "<nil>",
Detail: "old object must be of type v1beta1.ServiceBinding",
},
},
},
}

for _, c := range tests {
t.Run(c.name, func(t *testing.T) {
expectedErr := c.expected.ToAggregate()

_, actualUpdateErr := c.seed.ValidateUpdate(c.old)
if diff := cmp.Diff(expectedErr, actualUpdateErr); diff != "" {
t.Errorf("ValidateCreate (-expected, +actual): %s", diff)
}
})
}
}
29 changes: 27 additions & 2 deletions apis/v1beta1/servicebinding_webhook.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,8 @@ limitations under the License.
package v1beta1

import (
"fmt"

metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/util/validation/field"
Expand Down Expand Up @@ -52,9 +54,32 @@ func (r *ServiceBinding) ValidateCreate() (admission.Warnings, error) {

// ValidateUpdate implements webhook.Validator so a webhook will be registered for the type
func (r *ServiceBinding) ValidateUpdate(old runtime.Object) (admission.Warnings, error) {
// TODO(user): check for immutable fields, if any
r.Default()
return nil, r.validate().ToAggregate()

errs := field.ErrorList{}

// check immutable fields
if ro, ok := old.(*ServiceBinding); !ok {
errs = append(errs,
field.InternalError(nil, fmt.Errorf("old object must be of type v1beta1.ServiceBinding")),
)
} else {
if r.Spec.Workload.APIVersion != ro.Spec.Workload.APIVersion {
errs = append(errs,
field.Forbidden(field.NewPath("spec", "workload", "apiVersion"), "Workload apiVersion is immutable. Delete and recreate the ServiceBinding to update."),
)
}
if r.Spec.Workload.Kind != ro.Spec.Workload.Kind {
errs = append(errs,
field.Forbidden(field.NewPath("spec", "workload", "kind"), "Workload kind is immutable. Delete and recreate the ServiceBinding to update."),
)
}
}

// validate new object
errs = append(errs, r.validate()...)

return nil, errs.ToAggregate()
}

// ValidateDelete implements webhook.Validator so a webhook will be registered for the type
Expand Down
45 changes: 36 additions & 9 deletions controllers/servicebinding_controller.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -22,10 +22,13 @@ import (

"github.com/vmware-labs/reconciler-runtime/apis"
"github.com/vmware-labs/reconciler-runtime/reconcilers"
"github.com/vmware-labs/reconciler-runtime/tracker"
corev1 "k8s.io/api/core/v1"
apierrs "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
ctlr "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/builder"
"sigs.k8s.io/controller-runtime/pkg/handler"
Expand Down Expand Up @@ -122,20 +125,32 @@ func ResolveWorkloads(hooks lifecycle.ServiceBindingHooks) reconcilers.SubReconc
SyncWithResult: func(ctx context.Context, resource *servicebindingv1beta1.ServiceBinding) (reconcile.Result, error) {
c := reconcilers.RetrieveConfigOrDie(ctx)

trackingRef := tracker.Reference{
APIGroup: schema.FromAPIVersionAndKind(resource.Spec.Workload.APIVersion, "").Group,
Kind: resource.Spec.Workload.Kind,
Namespace: resource.Namespace,
}
if resource.Spec.Workload.Name != "" {
trackingRef.Name = resource.Spec.Workload.Name
}
if resource.Spec.Workload.Selector != nil {
selector, err := metav1.LabelSelectorAsSelector(resource.Spec.Workload.Selector)
if err != nil {
// should never get here
return reconcile.Result{}, err
}
trackingRef.Selector = selector
}
c.Tracker.TrackReference(trackingRef, resource)

ref := corev1.ObjectReference{
APIVersion: resource.Spec.Workload.APIVersion,
Kind: resource.Spec.Workload.Kind,
Namespace: resource.Namespace,
Name: resource.Spec.Workload.Name,
}
workloads, err := hooks.GetResolver(TrackingClient(c)).LookupWorkloads(ctx, ref, resource.Spec.Workload.Selector)
workloads, err := hooks.GetResolver(c).LookupWorkloads(ctx, ref, resource.Spec.Workload.Selector, resource.UID)
if err != nil {
if apierrs.IsNotFound(err) {
// leave Unknown, the workload may be created shortly
resource.GetConditionManager().MarkUnknown(servicebindingv1beta1.ServiceBindingConditionWorkloadProjected, "WorkloadNotFound", "the workload was not found")
// TODO use track rather than requeue
return reconcile.Result{Requeue: true}, nil
}
if apierrs.IsForbidden(err) {
// set False, the operator needs to give access to the resource
// see https://servicebinding.io/spec/core/1.0.0/#considerations-for-role-based-access-control-rbac-1
Expand All @@ -144,12 +159,24 @@ func ResolveWorkloads(hooks lifecycle.ServiceBindingHooks) reconcilers.SubReconc
} else {
resource.GetConditionManager().MarkFalse(servicebindingv1beta1.ServiceBindingConditionWorkloadProjected, "WorkloadForbidden", "the controller does not have permission to get the workload")
}
// TODO use track rather than requeue
return reconcile.Result{Requeue: true}, nil
return reconcile.Result{}, nil
}
// TODO handle other err cases
return reconcile.Result{}, err
}
if resource.Spec.Workload.Name != "" {
found := false
for _, workload := range workloads {
if workload.(metav1.Object).GetName() == resource.Spec.Workload.Name {
found = true
break
}
}
if !found {
// leave Unknown, the workload may be created shortly
resource.GetConditionManager().MarkUnknown(servicebindingv1beta1.ServiceBindingConditionWorkloadProjected, "WorkloadNotFound", "the workload was not found")
}
}

StashWorkloads(ctx, workloads)

Expand Down
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