Introduce IsWithinGracePeriod function

pkg/schema/v1/contracts.go

@@ -1,9 +1,12 @@
 package v1
 
 import (
+	"fmt"
 	"github.com/icinga/icinga-go-library/types"
 	kmetav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	ktypes "k8s.io/apimachinery/pkg/types"
+	kcache "k8s.io/client-go/tools/cache"
+	"time"
 )
 
 type Resource interface {
@@ -58,6 +61,25 @@ func (m *Meta) SetOwnerReferences([]kmetav1.OwnerReference)    { panic("Not expe
 func (m *Meta) GetManagedFields() []kmetav1.ManagedFieldsEntry { panic("Not expected to be called") }
 func (m *Meta) SetManagedFields([]kmetav1.ManagedFieldsEntry)  { panic("Not expected to be called") }
 
+func IsWithinGracePeriod(k kmetav1.Object) *string {
+	const gracePeriod = 5 * time.Minute
+
+	deadline := k.GetCreationTimestamp().Add(gracePeriod)
+	now := time.Now()
+	if now.Before(deadline) {
+		key, _ := kcache.MetaNamespaceKeyFunc(k)
+		reason := fmt.Sprintf(
+			"%s %s is within grace period until %s, so its state is not yet evaluated.",
+			types.Name(k),
+			key,
+			deadline)
+
+		return &reason
+	}
+
+	return nil
+}
+
 // Assert interface compliance.
 var (
 	_ kmetav1.Object = (*Meta)(nil)