242 lines
8.2 KiB
Go
242 lines
8.2 KiB
Go
/*
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Copyright 2021 The Karmada Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package util
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import (
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corev1 "k8s.io/api/core/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
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"k8s.io/apimachinery/pkg/labels"
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"k8s.io/klog/v2"
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"k8s.io/utils/strings/slices"
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clusterv1alpha1 "github.com/karmada-io/karmada/pkg/apis/cluster/v1alpha1"
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policyv1alpha1 "github.com/karmada-io/karmada/pkg/apis/policy/v1alpha1"
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"github.com/karmada-io/karmada/pkg/util/lifted"
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)
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// ImplicitPriority describes the extent to which a ResourceSelector or a set of
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// ResourceSelectors match resources.
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type ImplicitPriority int
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const (
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// PriorityMisMatch means the ResourceSelector does not match the resource.
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PriorityMisMatch ImplicitPriority = iota
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// PriorityMatchAll means the ResourceSelector whose Name and LabelSelector is empty
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// matches the resource.
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PriorityMatchAll
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// PriorityMatchLabelSelector means the LabelSelector of ResourceSelector matches the resource.
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PriorityMatchLabelSelector
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// PriorityMatchName means the Name of ResourceSelector matches the resource.
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PriorityMatchName
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)
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// ResourceMatches tells if the specific resource matches the selector.
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func ResourceMatches(resource *unstructured.Unstructured, rs policyv1alpha1.ResourceSelector) bool {
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return ResourceSelectorPriority(resource, rs) > PriorityMisMatch
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}
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// ResourceSelectorPriority tells the priority between the specific resource and the selector.
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func ResourceSelectorPriority(resource *unstructured.Unstructured, rs policyv1alpha1.ResourceSelector) ImplicitPriority {
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if resource.GetAPIVersion() != rs.APIVersion ||
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resource.GetKind() != rs.Kind ||
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(len(rs.Namespace) > 0 && resource.GetNamespace() != rs.Namespace) {
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return PriorityMisMatch
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}
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// match rules:
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// case ResourceSelector.name ResourceSelector.labelSelector Rule
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// 1 not-empty not-empty match name only and ignore selector
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// 2 not-empty empty match name only
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// 3 empty not-empty match selector only
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// 4 empty empty match all
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// case 1, 2: name not empty, don't need to consult selector.
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if len(rs.Name) > 0 {
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if rs.Name == resource.GetName() {
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return PriorityMatchName
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}
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return PriorityMisMatch
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}
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// case 4: short path, both name and selector empty, matches all
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if rs.LabelSelector == nil {
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return PriorityMatchAll
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}
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// case 3: matches with selector
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var s labels.Selector
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var err error
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if s, err = metav1.LabelSelectorAsSelector(rs.LabelSelector); err != nil {
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// should not happen because all resource selector should be fully validated by webhook.
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return PriorityMisMatch
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}
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if s.Matches(labels.Set(resource.GetLabels())) {
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return PriorityMatchLabelSelector
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}
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return PriorityMisMatch
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}
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// ClusterMatches tells if specific cluster matches the affinity.
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func ClusterMatches(cluster *clusterv1alpha1.Cluster, affinity policyv1alpha1.ClusterAffinity) bool {
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for _, clusterName := range affinity.ExcludeClusters {
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if clusterName == cluster.Name {
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return false
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}
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}
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// match rules:
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// case LabelSelector ClusterNames FieldSelector Rule
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// 1 not-empty not-empty not-empty match selector, name and field
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// 2 not-empty empty empty match selector only
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// 3 not-empty not-empty empty match selector, name
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// 4 not-empty empty not-empty match selector, filed
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// 5 empty not-empty not-empty match name, filed
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// 6 empty not-empty empty match name only
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// 7 empty empty not-empty match field only
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// 8 empty empty empty match all
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if affinity.LabelSelector != nil {
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var s labels.Selector
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var err error
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if s, err = metav1.LabelSelectorAsSelector(affinity.LabelSelector); err != nil {
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return false
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}
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if !s.Matches(labels.Set(cluster.GetLabels())) {
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return false
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}
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}
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if affinity.FieldSelector != nil {
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var clusterFieldsMatchExpressions []corev1.NodeSelectorRequirement
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for i := range affinity.FieldSelector.MatchExpressions {
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matchExpression := &affinity.FieldSelector.MatchExpressions[i]
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if matchExpression.Key != ZoneField {
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clusterFieldsMatchExpressions = append(clusterFieldsMatchExpressions, *matchExpression)
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continue
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}
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// First, match zones field.
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if !matchZones(matchExpression, cluster.Spec.Zones) {
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return false
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}
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}
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if len(clusterFieldsMatchExpressions) > 0 {
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// Second, match other fields.
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var matchFields labels.Selector
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var errs []error
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if matchFields, errs = lifted.NodeSelectorRequirementsAsSelector(clusterFieldsMatchExpressions); errs != nil {
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return false
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}
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clusterFields := extractClusterFields(cluster)
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if matchFields != nil && !matchFields.Matches(clusterFields) {
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return false
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}
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}
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}
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return ClusterNamesMatches(cluster, affinity.ClusterNames)
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}
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// ClusterNamesMatches tells if specific cluster matches the clusterNames affinity.
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func ClusterNamesMatches(cluster *clusterv1alpha1.Cluster, clusterNames []string) bool {
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if len(clusterNames) == 0 {
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return true
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}
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for _, clusterName := range clusterNames {
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if clusterName == cluster.Name {
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return true
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}
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}
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return false
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}
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// ResourceMatchSelectors tells if the specific resource matches the selectors.
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func ResourceMatchSelectors(resource *unstructured.Unstructured, selectors ...policyv1alpha1.ResourceSelector) bool {
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for _, rs := range selectors {
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if ResourceMatches(resource, rs) {
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return true
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}
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}
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return false
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}
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// ResourceMatchSelectorsPriority returns the highest priority between specific resource and the selectors.
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func ResourceMatchSelectorsPriority(resource *unstructured.Unstructured, selectors ...policyv1alpha1.ResourceSelector) ImplicitPriority {
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var priority ImplicitPriority
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for _, rs := range selectors {
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if p := ResourceSelectorPriority(resource, rs); p > priority {
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priority = p
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}
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}
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return priority
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}
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func extractClusterFields(cluster *clusterv1alpha1.Cluster) labels.Set {
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clusterFieldsMap := make(labels.Set)
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if cluster.Spec.Provider != "" {
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clusterFieldsMap[ProviderField] = cluster.Spec.Provider
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}
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if cluster.Spec.Region != "" {
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clusterFieldsMap[RegionField] = cluster.Spec.Region
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}
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return clusterFieldsMap
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}
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// matchZones checks if zoneMatchExpression can match zones and returns true if it matches.
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// For unknown operators, matchZones always returns false.
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// The matching rules are as follows:
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// 1. When the operator is "In", zoneMatchExpression must contain all zones, otherwise it doesn't match.
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// 2. When the operator is "NotIn", zoneMatchExpression mustn't contain any one of zones, otherwise it doesn't match.
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// 3. When the operator is "Exists", zones mustn't be empty, otherwise it doesn't match.
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// 4. When the operator is "DoesNotExist", zones must be empty, otherwise it doesn't match.
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func matchZones(zoneMatchExpression *corev1.NodeSelectorRequirement, zones []string) bool {
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switch zoneMatchExpression.Operator {
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case corev1.NodeSelectorOpIn:
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if len(zones) == 0 {
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return false
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}
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for _, zone := range zones {
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if !slices.Contains(zoneMatchExpression.Values, zone) {
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return false
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}
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}
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return true
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case corev1.NodeSelectorOpNotIn:
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for _, zone := range zones {
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if slices.Contains(zoneMatchExpression.Values, zone) {
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return false
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}
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}
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return true
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case corev1.NodeSelectorOpExists:
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return len(zones) > 0
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case corev1.NodeSelectorOpDoesNotExist:
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return len(zones) == 0
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default:
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klog.V(5).Infof("Unsupported %q operator for zones requirement", zoneMatchExpression.Operator)
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return false
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}
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}
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