123 lines
4.1 KiB
Go
123 lines
4.1 KiB
Go
/*
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Copyright 2019 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 interpodaffinity
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import (
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"fmt"
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"k8s.io/apimachinery/pkg/labels"
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"k8s.io/apimachinery/pkg/runtime"
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listersv1 "k8s.io/client-go/listers/core/v1"
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"k8s.io/klog/v2"
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"k8s.io/kubernetes/pkg/scheduler/apis/config"
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"k8s.io/kubernetes/pkg/scheduler/apis/config/validation"
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"k8s.io/kubernetes/pkg/scheduler/framework"
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"k8s.io/kubernetes/pkg/scheduler/framework/plugins/feature"
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"k8s.io/kubernetes/pkg/scheduler/internal/parallelize"
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)
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const (
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// Name is the name of the plugin used in the plugin registry and configurations.
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Name = "InterPodAffinity"
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)
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var _ framework.PreFilterPlugin = &InterPodAffinity{}
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var _ framework.FilterPlugin = &InterPodAffinity{}
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var _ framework.PreScorePlugin = &InterPodAffinity{}
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var _ framework.ScorePlugin = &InterPodAffinity{}
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// InterPodAffinity is a plugin that checks inter pod affinity
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type InterPodAffinity struct {
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parallelizer parallelize.Parallelizer
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args config.InterPodAffinityArgs
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sharedLister framework.SharedLister
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nsLister listersv1.NamespaceLister
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enableNamespaceSelector bool
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}
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// Name returns name of the plugin. It is used in logs, etc.
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func (pl *InterPodAffinity) Name() string {
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return Name
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}
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// New initializes a new plugin and returns it.
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func New(plArgs runtime.Object, h framework.Handle, fts feature.Features) (framework.Plugin, error) {
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if h.SnapshotSharedLister() == nil {
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return nil, fmt.Errorf("SnapshotSharedlister is nil")
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}
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args, err := getArgs(plArgs)
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if err != nil {
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return nil, err
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}
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if err := validation.ValidateInterPodAffinityArgs(args); err != nil {
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return nil, err
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}
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pl := &InterPodAffinity{
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parallelizer: h.Parallelizer(),
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args: args,
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sharedLister: h.SnapshotSharedLister(),
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enableNamespaceSelector: fts.EnablePodAffinityNamespaceSelector,
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}
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if pl.enableNamespaceSelector {
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pl.nsLister = h.SharedInformerFactory().Core().V1().Namespaces().Lister()
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}
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return pl, nil
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}
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func getArgs(obj runtime.Object) (config.InterPodAffinityArgs, error) {
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ptr, ok := obj.(*config.InterPodAffinityArgs)
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if !ok {
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return config.InterPodAffinityArgs{}, fmt.Errorf("want args to be of type InterPodAffinityArgs, got %T", obj)
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}
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return *ptr, nil
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}
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// Updates Namespaces with the set of namespaces identified by NamespaceSelector.
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// If successful, NamespaceSelector is set to nil.
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// The assumption is that the term is for an incoming pod, in which case
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// namespaceSelector is either unrolled into Namespaces (and so the selector
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// is set to Nothing()) or is Empty(), which means match everything. Therefore,
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// there when matching against this term, there is no need to lookup the existing
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// pod's namespace labels to match them against term's namespaceSelector explicitly.
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func (pl *InterPodAffinity) mergeAffinityTermNamespacesIfNotEmpty(at *framework.AffinityTerm) error {
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if at.NamespaceSelector.Empty() {
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return nil
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}
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ns, err := pl.nsLister.List(at.NamespaceSelector)
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if err != nil {
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return err
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}
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for _, n := range ns {
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at.Namespaces.Insert(n.Name)
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}
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at.NamespaceSelector = labels.Nothing()
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return nil
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}
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// GetNamespaceLabelsSnapshot returns a snapshot of the labels associated with
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// the namespace.
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func GetNamespaceLabelsSnapshot(ns string, nsLister listersv1.NamespaceLister) (nsLabels labels.Set) {
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podNS, err := nsLister.Get(ns)
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if err == nil {
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// Create and return snapshot of the labels.
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return labels.Merge(podNS.Labels, nil)
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}
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klog.ErrorS(err, "getting namespace, assuming empty set of namespace labels", "namespace", ns)
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return
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}
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