72 lines
3.0 KiB
Go
72 lines
3.0 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 helper
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import (
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"k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/labels"
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"k8s.io/component-helpers/scheduling/corev1"
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)
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// PodMatchesNodeSelectorAndAffinityTerms checks whether the pod is schedulable onto nodes according to
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// the requirements in both NodeAffinity and nodeSelector.
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func PodMatchesNodeSelectorAndAffinityTerms(pod *v1.Pod, node *v1.Node) bool {
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// Check if node.Labels match pod.Spec.NodeSelector.
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if len(pod.Spec.NodeSelector) > 0 {
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selector := labels.SelectorFromSet(pod.Spec.NodeSelector)
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if !selector.Matches(labels.Set(node.Labels)) {
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return false
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}
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}
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if pod.Spec.Affinity == nil {
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return true
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}
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return NodeMatchesNodeAffinity(pod.Spec.Affinity.NodeAffinity, node)
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}
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// NodeMatchesNodeAffinity checks whether the Node satisfy the given NodeAffinity.
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func NodeMatchesNodeAffinity(affinity *v1.NodeAffinity, node *v1.Node) bool {
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// 1. nil NodeSelector matches all nodes (i.e. does not filter out any nodes)
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// 2. nil []NodeSelectorTerm (equivalent to non-nil empty NodeSelector) matches no nodes
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// 3. zero-length non-nil []NodeSelectorTerm matches no nodes also, just for simplicity
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// 4. nil []NodeSelectorRequirement (equivalent to non-nil empty NodeSelectorTerm) matches no nodes
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// 5. zero-length non-nil []NodeSelectorRequirement matches no nodes also, just for simplicity
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// 6. non-nil empty NodeSelectorRequirement is not allowed
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if affinity == nil {
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return true
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}
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// Match node selector for requiredDuringSchedulingRequiredDuringExecution.
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// TODO: Uncomment this block when implement RequiredDuringSchedulingRequiredDuringExecution.
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// if affinity.RequiredDuringSchedulingRequiredDuringExecution != nil && !nodeMatchesNodeSelector(node, affinity.RequiredDuringSchedulingRequiredDuringExecution) {
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// return false
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// }
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// Match node selector for requiredDuringSchedulingIgnoredDuringExecution.
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if affinity.RequiredDuringSchedulingIgnoredDuringExecution != nil && !nodeMatchesNodeSelector(node, affinity.RequiredDuringSchedulingIgnoredDuringExecution) {
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return false
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}
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return true
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}
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// nodeMatchesNodeSelector checks if a node's labels satisfy a list of node selector terms,
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// terms are ORed, and an empty list of terms will match nothing.
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func nodeMatchesNodeSelector(node *v1.Node, nodeSelector *v1.NodeSelector) bool {
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// TODO(#96164): parse this error earlier in the plugin so we only need to do it once per Pod.
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matches, _ := corev1.MatchNodeSelectorTerms(node, nodeSelector)
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return matches
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}
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