119 lines
4.2 KiB
Go
119 lines
4.2 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 nodeaffinity
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import (
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"context"
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"fmt"
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v1 "k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/labels"
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"k8s.io/apimachinery/pkg/runtime"
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v1helper "k8s.io/kubernetes/pkg/apis/core/v1/helper"
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pluginhelper "k8s.io/kubernetes/pkg/scheduler/framework/plugins/helper"
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framework "k8s.io/kubernetes/pkg/scheduler/framework/v1alpha1"
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)
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// NodeAffinity is a plugin that checks if a pod node selector matches the node label.
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type NodeAffinity struct {
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handle framework.FrameworkHandle
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}
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var _ framework.FilterPlugin = &NodeAffinity{}
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var _ framework.ScorePlugin = &NodeAffinity{}
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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 = "NodeAffinity"
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// ErrReason for node affinity/selector not matching.
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ErrReason = "node(s) didn't match node selector"
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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 *NodeAffinity) Name() string {
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return Name
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}
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// Filter invoked at the filter extension point.
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func (pl *NodeAffinity) Filter(ctx context.Context, state *framework.CycleState, pod *v1.Pod, nodeInfo *framework.NodeInfo) *framework.Status {
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node := nodeInfo.Node()
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if node == nil {
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return framework.NewStatus(framework.Error, "node not found")
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}
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if !pluginhelper.PodMatchesNodeSelectorAndAffinityTerms(pod, node) {
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return framework.NewStatus(framework.UnschedulableAndUnresolvable, ErrReason)
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}
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return nil
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}
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// Score invoked at the Score extension point.
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func (pl *NodeAffinity) Score(ctx context.Context, state *framework.CycleState, pod *v1.Pod, nodeName string) (int64, *framework.Status) {
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nodeInfo, err := pl.handle.SnapshotSharedLister().NodeInfos().Get(nodeName)
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if err != nil {
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return 0, framework.NewStatus(framework.Error, fmt.Sprintf("getting node %q from Snapshot: %v", nodeName, err))
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}
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node := nodeInfo.Node()
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if node == nil {
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return 0, framework.NewStatus(framework.Error, fmt.Sprintf("getting node %q from Snapshot: %v", nodeName, err))
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}
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affinity := pod.Spec.Affinity
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var count int64
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// A nil element of PreferredDuringSchedulingIgnoredDuringExecution matches no objects.
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// An element of PreferredDuringSchedulingIgnoredDuringExecution that refers to an
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// empty PreferredSchedulingTerm matches all objects.
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if affinity != nil && affinity.NodeAffinity != nil && affinity.NodeAffinity.PreferredDuringSchedulingIgnoredDuringExecution != nil {
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// Match PreferredDuringSchedulingIgnoredDuringExecution term by term.
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for i := range affinity.NodeAffinity.PreferredDuringSchedulingIgnoredDuringExecution {
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preferredSchedulingTerm := &affinity.NodeAffinity.PreferredDuringSchedulingIgnoredDuringExecution[i]
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if preferredSchedulingTerm.Weight == 0 {
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continue
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}
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// TODO: Avoid computing it for all nodes if this becomes a performance problem.
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nodeSelector, err := v1helper.NodeSelectorRequirementsAsSelector(preferredSchedulingTerm.Preference.MatchExpressions)
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if err != nil {
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return 0, framework.NewStatus(framework.Error, err.Error())
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}
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if nodeSelector.Matches(labels.Set(node.Labels)) {
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count += int64(preferredSchedulingTerm.Weight)
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}
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}
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}
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return count, nil
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}
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// NormalizeScore invoked after scoring all nodes.
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func (pl *NodeAffinity) NormalizeScore(ctx context.Context, state *framework.CycleState, pod *v1.Pod, scores framework.NodeScoreList) *framework.Status {
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return pluginhelper.DefaultNormalizeScore(framework.MaxNodeScore, false, scores)
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}
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// ScoreExtensions of the Score plugin.
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func (pl *NodeAffinity) ScoreExtensions() framework.ScoreExtensions {
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return pl
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}
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// New initializes a new plugin and returns it.
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func New(_ *runtime.Unknown, h framework.FrameworkHandle) (framework.Plugin, error) {
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return &NodeAffinity{handle: h}, nil
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}
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