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implement propagation policy priority preemption
Signed-off-by: whitewindmills <jayfantasyhjh@gmail.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,180 @@ | ||
| package detector | ||
|
|
||
| import ( | ||
| apierrors "k8s.io/apimachinery/pkg/api/errors" | ||
| "k8s.io/apimachinery/pkg/apis/meta/v1/unstructured" | ||
| utilerrors "k8s.io/apimachinery/pkg/util/errors" | ||
| "k8s.io/klog/v2" | ||
|
|
||
| policyv1alpha1 "github.com/karmada-io/karmada/pkg/apis/policy/v1alpha1" | ||
| "github.com/karmada-io/karmada/pkg/features" | ||
| "github.com/karmada-io/karmada/pkg/util" | ||
| "github.com/karmada-io/karmada/pkg/util/fedinformer/keys" | ||
| "github.com/karmada-io/karmada/pkg/util/helper" | ||
| "github.com/karmada-io/karmada/pkg/util/names" | ||
| ) | ||
|
|
||
| // preemptionEnabled checks if preemption is enabled. | ||
| func preemptionEnabled(preemption policyv1alpha1.PreemptionBehavior) bool { | ||
| if preemption != policyv1alpha1.PreemptAlways { | ||
| return false | ||
| } | ||
| if !features.FeatureGate.Enabled(features.PolicyPreemption) { | ||
| klog.Warningf("Cannot handle the preemption process because feature gate %q is not enabled.", features.PolicyPreemption) | ||
| return false | ||
| } | ||
| return true | ||
| } | ||
|
|
||
| // handleClusterPropagationPolicyPreemption handles the preemption process of PropagationPolicy. | ||
| // The preemption rule: high-priority PP > low-priority PP > CPP. | ||
| func (d *ResourceDetector) handlePropagationPolicyPreemption(policy *policyv1alpha1.PropagationPolicy) error { | ||
| var errs []error | ||
| for _, rs := range policy.Spec.ResourceSelectors { | ||
| resourceTemplate, err := d.fetchResourceTemplate(rs) | ||
| if err != nil { | ||
| errs = append(errs, err) | ||
| continue | ||
| } | ||
| if resourceTemplate == nil { | ||
| continue | ||
| } | ||
|
|
||
| errs = append(errs, d.preemptPropagationPolicy(resourceTemplate, policy)) | ||
| // TODO(whitewindmills): PP preempts CPP. | ||
| } | ||
|
|
||
| return utilerrors.NewAggregate(errs) | ||
| } | ||
|
|
||
| // handleClusterPropagationPolicyPreemption handles the preemption process of ClusterPropagationPolicy. | ||
| // The preemption rule: high-priority CPP > low-priority CPP. | ||
| func (d *ResourceDetector) handleClusterPropagationPolicyPreemption(policy *policyv1alpha1.ClusterPropagationPolicy) error { | ||
| var errs []error | ||
| for _, rs := range policy.Spec.ResourceSelectors { | ||
| resourceTemplate, err := d.fetchResourceTemplate(rs) | ||
| if err != nil { | ||
| errs = append(errs, err) | ||
| continue | ||
| } | ||
| if resourceTemplate == nil { | ||
| continue | ||
| } | ||
|
|
||
| errs = append(errs, d.preemptClusterPropagationPolicy(resourceTemplate, policy)) | ||
| } | ||
|
|
||
| return utilerrors.NewAggregate(errs) | ||
| } | ||
|
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| // preemptPropagationPolicy preempts resource template that is claimed by PropagationPolicy. | ||
| func (d *ResourceDetector) preemptPropagationPolicy(resourceTemplate *unstructured.Unstructured, policy *policyv1alpha1.PropagationPolicy) error { | ||
| rtLabels := resourceTemplate.GetLabels() | ||
| claimedPolicyNamespace := util.GetLabelValue(rtLabels, policyv1alpha1.PropagationPolicyNamespaceLabel) | ||
| claimedPolicyName := util.GetLabelValue(rtLabels, policyv1alpha1.PropagationPolicyNameLabel) | ||
| if claimedPolicyName == "" || claimedPolicyNamespace == "" { | ||
| return nil | ||
| } | ||
| // resource template has been claimed by policy itself. | ||
| if claimedPolicyNamespace == policy.Namespace && claimedPolicyName == policy.Name { | ||
| return nil | ||
| } | ||
|
|
||
| claimedPolicyObj, err := d.propagationPolicyLister.ByNamespace(claimedPolicyNamespace).Get(claimedPolicyName) | ||
| if err != nil { | ||
| klog.Errorf("Failed to retrieve claimed propagation policy(%s/%s): %v.", claimedPolicyNamespace, claimedPolicyName, err) | ||
| return err | ||
| } | ||
|
|
||
| claimedPolicy := &policyv1alpha1.PropagationPolicy{} | ||
| if err = helper.ConvertToTypedObject(claimedPolicyObj, claimedPolicy); err != nil { | ||
| klog.Errorf("Failed to convert PropagationPolicy from unstructured object: %v.", err) | ||
| return err | ||
| } | ||
|
|
||
| if policy.ExplicitPriority() <= claimedPolicy.ExplicitPriority() { | ||
| klog.V(2).Infof("Propagation policy(%s/%s) cannot preempt another propagation policy(%s/%s) due to insufficient priority.", | ||
| policy.Namespace, policy.Name, claimedPolicyNamespace, claimedPolicyName) | ||
| return nil | ||
| } | ||
|
|
||
| clusterWideKey, err := keys.ClusterWideKeyFunc(resourceTemplate) | ||
| if err != nil { | ||
| // should not happen. | ||
| return err | ||
| } | ||
| if err := d.ApplyPolicy(resourceTemplate, clusterWideKey, policy); err != nil { | ||
| klog.Errorf("Failed to apply new propagation policy(%s/%s) on resource template(%s, kind=%s, %s): %v.", policy.Namespace, policy.Name, | ||
| resourceTemplate.GetAPIVersion(), resourceTemplate.GetKind(), names.NamespacedKey(resourceTemplate.GetNamespace(), resourceTemplate.GetName()), err) | ||
| return err | ||
| } | ||
| klog.V(4).Infof("Propagation policy(%s/%s) has preempted another propagation policy(%s/%s).", | ||
| policy.Namespace, policy.Name, claimedPolicyNamespace, claimedPolicyName) | ||
| return nil | ||
| } | ||
|
|
||
| // preemptClusterPropagationPolicy preempts resource template that is claimed by ClusterPropagationPolicy. | ||
| func (d *ResourceDetector) preemptClusterPropagationPolicy(resourceTemplate *unstructured.Unstructured, policy *policyv1alpha1.ClusterPropagationPolicy) error { | ||
| claimedPolicyName := util.GetLabelValue(resourceTemplate.GetLabels(), policyv1alpha1.ClusterPropagationPolicyLabel) | ||
| if claimedPolicyName == "" { | ||
| return nil | ||
| } | ||
| // resource template has been claimed by policy itself. | ||
| if claimedPolicyName == policy.Name { | ||
| return nil | ||
| } | ||
|
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||
| claimedPolicyObj, err := d.clusterPropagationPolicyLister.Get(claimedPolicyName) | ||
| if err != nil { | ||
| klog.Errorf("Failed to retrieve claimed cluster propagation policy(%s): %v.", claimedPolicyName, err) | ||
| return err | ||
| } | ||
|
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||
| claimedPolicy := &policyv1alpha1.ClusterPropagationPolicy{} | ||
| if err = helper.ConvertToTypedObject(claimedPolicyObj, claimedPolicy); err != nil { | ||
| klog.Errorf("Failed to convert ClusterPropagationPolicy from unstructured object: %v.", err) | ||
| return err | ||
| } | ||
|
|
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| if policy.ExplicitPriority() <= claimedPolicy.ExplicitPriority() { | ||
| klog.V(2).Infof("Cluster propagation policy(%s) cannot preempt another cluster propagation policy(%s) due to insufficient priority.", | ||
| policy.Name, claimedPolicyName) | ||
| return nil | ||
| } | ||
|
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||
| clusterWideKey, err := keys.ClusterWideKeyFunc(resourceTemplate) | ||
| if err != nil { | ||
| // should not happen. | ||
| return err | ||
| } | ||
| if err := d.ApplyClusterPolicy(resourceTemplate, clusterWideKey, policy); err != nil { | ||
| klog.Errorf("Failed to apply new cluster propagation policy(%s) on resource template(%s, kind=%s, %s): %v.", policy.Name, | ||
| resourceTemplate.GetAPIVersion(), resourceTemplate.GetKind(), names.NamespacedKey(resourceTemplate.GetNamespace(), resourceTemplate.GetName()), err) | ||
| return err | ||
| } | ||
| klog.V(4).Infof("Cluster propagation policy(%s) has preempted another cluster propagation policy(%s).", policy.Name, claimedPolicyName) | ||
| return nil | ||
| } | ||
|
|
||
| // fetchResourceTemplate fetches resource template by resource selector, ignore it if not found or deleting. | ||
| func (d *ResourceDetector) fetchResourceTemplate(rs policyv1alpha1.ResourceSelector) (*unstructured.Unstructured, error) { | ||
| resourceTemplate, err := helper.FetchResourceTemplate(d.DynamicClient, d.InformerManager, d.RESTMapper, helper.ConstructObjectReference(rs)) | ||
| if err != nil { | ||
| // do nothing if resource template not exist, it might has been removed. | ||
| if apierrors.IsNotFound(err) { | ||
| klog.V(2).Infof("Resource template(%s, kind=%s, %s) cannot be preempted because it has been deleted.", | ||
| rs.APIVersion, rs.Kind, names.NamespacedKey(rs.Namespace, rs.Name)) | ||
| return nil, nil | ||
| } | ||
| klog.Errorf("Failed to fetch resource template(%s, kind=%s, %s): %v.", rs.APIVersion, rs.Kind, | ||
| names.NamespacedKey(rs.Namespace, rs.Name), err) | ||
| return nil, err | ||
| } | ||
|
|
||
| if !resourceTemplate.GetDeletionTimestamp().IsZero() { | ||
| klog.V(2).Infof("Resource template(%s, kind=%s, %s) cannot be preempted because it's being deleted.", | ||
| rs.APIVersion, rs.Kind, names.NamespacedKey(rs.Namespace, rs.Name)) | ||
| return nil, nil | ||
| } | ||
| return resourceTemplate, nil | ||
| } |
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