Feat: support custom cascading gc policy (#6059)

apis/core.oam.dev/v1alpha1/garbagecollect_policy_types.go

@@ -17,7 +17,9 @@ limitations under the License.
 package v1alpha1
 
 import (
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
+	"sigs.k8s.io/controller-runtime/pkg/client"
 )
 
 const (
@@ -56,8 +58,9 @@ const (
 
 // GarbageCollectPolicyRule defines a single garbage-collect policy rule
 type GarbageCollectPolicyRule struct {
-	Selector ResourcePolicyRuleSelector `json:"selector"`
-	Strategy GarbageCollectStrategy     `json:"strategy"`
+	Selector    ResourcePolicyRuleSelector `json:"selector"`
+	Strategy    GarbageCollectStrategy     `json:"strategy"`
+	Propagation *GarbageCollectPropagation `json:"propagation"`
 }
 
 // GarbageCollectStrategy the strategy for target resource to recycle
@@ -73,6 +76,16 @@ const (
 	GarbageCollectStrategyOnAppUpdate GarbageCollectStrategy = "onAppUpdate"
 )
 
+// GarbageCollectPropagation the deletion propagation setting similar to metav1.DeletionPropagation
+type GarbageCollectPropagation string
+
+const (
+	// GarbageCollectPropagationOrphan orphan child resources while deleting target resources
+	GarbageCollectPropagationOrphan = "orphan"
+	// GarbageCollectPropagationCascading delete child resources in background while deleting target resources
+	GarbageCollectPropagationCascading = "cascading"
+)
+
 // Type the type name of the policy
 func (in *GarbageCollectPolicySpec) Type() string {
 	return GarbageCollectPolicyType
@@ -87,3 +100,18 @@ func (in *GarbageCollectPolicySpec) FindStrategy(manifest *unstructured.Unstruct
 	}
 	return nil
 }
+
+// FindDeleteOption find delete option for target resource
+func (in *GarbageCollectPolicySpec) FindDeleteOption(manifest *unstructured.Unstructured) []client.DeleteOption {
+	for _, rule := range in.Rules {
+		if rule.Selector.Match(manifest) && rule.Propagation != nil {
+			switch *rule.Propagation {
+			case GarbageCollectPropagationOrphan:
+				return []client.DeleteOption{client.PropagationPolicy(metav1.DeletePropagationOrphan)}
+			case GarbageCollectPropagationCascading:
+				return []client.DeleteOption{client.PropagationPolicy(metav1.DeletePropagationBackground)}
+			}
+		}
+	}
+	return nil
+}

apis/core.oam.dev/v1alpha1/zz_generated.deepcopy.go

@@ -314,6 +314,11 @@ func (in *EnvTraitPatch) DeepCopy() *EnvTraitPatch {
 func (in *GarbageCollectPolicyRule) DeepCopyInto(out *GarbageCollectPolicyRule) {
 	*out = *in
 	in.Selector.DeepCopyInto(&out.Selector)
+	if in.Propagation != nil {
+		in, out := &in.Propagation, &out.Propagation
+		*out = new(GarbageCollectPropagation)
+		**out = **in
+	}
 }
 
 // DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new GarbageCollectPolicyRule.