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d40a8f3279
failureDomains are only used for PreferredDuringScheduling pod anti-affinity, which is ignored by PodAffinityChecker. This unnecessary requirement was making it hard to move PodAffinityChecker to GeneralPredicates because that would require passing --failure-domains to both kubelet and kube-controller-manager.
83 lines
3.0 KiB
Go
83 lines
3.0 KiB
Go
/*
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Copyright 2016 The Kubernetes 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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"k8s.io/kubernetes/pkg/api/v1"
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metav1 "k8s.io/kubernetes/pkg/apis/meta/v1"
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"k8s.io/kubernetes/pkg/labels"
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"k8s.io/kubernetes/pkg/util/sets"
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)
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// GetNamespacesFromPodAffinityTerm returns a set of names
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// according to the namespaces indicated in podAffinityTerm.
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// 1. If the namespaces is nil considers the given pod's namespace
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// 2. If the namespaces is empty list then considers all the namespaces
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func getNamespacesFromPodAffinityTerm(pod *v1.Pod, podAffinityTerm v1.PodAffinityTerm) sets.String {
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names := sets.String{}
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if podAffinityTerm.Namespaces == nil {
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names.Insert(pod.Namespace)
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} else if len(podAffinityTerm.Namespaces) != 0 {
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names.Insert(podAffinityTerm.Namespaces...)
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}
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return names
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}
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// PodMatchesTermsNamespaceAndSelector returns true if the given <pod>
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// matches the namespace and selector defined by <affinityPod>`s <term>.
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func PodMatchesTermsNamespaceAndSelector(pod *v1.Pod, affinityPod *v1.Pod, term *v1.PodAffinityTerm) (bool, error) {
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namespaces := getNamespacesFromPodAffinityTerm(affinityPod, *term)
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if len(namespaces) != 0 && !namespaces.Has(pod.Namespace) {
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return false, nil
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}
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selector, err := metav1.LabelSelectorAsSelector(term.LabelSelector)
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if err != nil || !selector.Matches(labels.Set(pod.Labels)) {
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return false, err
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}
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return true, nil
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}
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// NodesHaveSameTopologyKey checks if nodeA and nodeB have same label value with given topologyKey as label key.
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// Returns false if topologyKey is empty.
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func NodesHaveSameTopologyKey(nodeA, nodeB *v1.Node, topologyKey string) bool {
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if len(topologyKey) == 0 {
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return false
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}
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return nodeA.Labels != nil && nodeB.Labels != nil && len(nodeA.Labels[topologyKey]) > 0 && nodeA.Labels[topologyKey] == nodeB.Labels[topologyKey]
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}
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type Topologies struct {
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DefaultKeys []string
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}
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// NodesHaveSameTopologyKey checks if nodeA and nodeB have same label value with given topologyKey as label key.
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// If the topologyKey is nil/empty, check if the two nodes have any of the default topologyKeys, and have same corresponding label value.
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func (tps *Topologies) NodesHaveSameTopologyKey(nodeA, nodeB *v1.Node, topologyKey string) bool {
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if len(topologyKey) == 0 {
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// assumes this is allowed only for PreferredDuringScheduling pod anti-affinity (ensured by api/validation)
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for _, defaultKey := range tps.DefaultKeys {
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if NodesHaveSameTopologyKey(nodeA, nodeB, defaultKey) {
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return true
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}
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}
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return false
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} else {
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return NodesHaveSameTopologyKey(nodeA, nodeB, topologyKey)
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}
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}
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