71 lines
2.4 KiB
Go
71 lines
2.4 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 nodelabel
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import (
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"context"
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v1 "k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/kubernetes/pkg/scheduler/algorithm/predicates"
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"k8s.io/kubernetes/pkg/scheduler/framework/plugins/migration"
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framework "k8s.io/kubernetes/pkg/scheduler/framework/v1alpha1"
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"k8s.io/kubernetes/pkg/scheduler/nodeinfo"
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)
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// Name of this plugin.
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const Name = "NodeLabel"
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// Args holds the args that are used to configure the plugin.
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type Args struct {
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// The list of labels that identify node "groups"
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// All of the labels should be either present (or absent) for the node to be considered a fit for hosting the pod
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Labels []string `json:"labels,omitempty"`
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// The boolean flag that indicates whether the labels should be present or absent from the node
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Presence bool `json:"presence,omitempty"`
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}
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// New initializes a new plugin and returns it.
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func New(plArgs *runtime.Unknown, _ framework.FrameworkHandle) (framework.Plugin, error) {
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args := &Args{}
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if err := framework.DecodeInto(plArgs, args); err != nil {
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return nil, err
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}
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return &NodeLabel{
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predicate: predicates.NewNodeLabelPredicate(args.Labels, args.Presence),
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}, nil
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}
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// NodeLabel checks whether a pod can fit based on the node labels which match a filter that it requests.
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type NodeLabel struct {
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predicate predicates.FitPredicate
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}
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var _ framework.FilterPlugin = &NodeLabel{}
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// Name returns name of the plugin. It is used in logs, etc.
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func (pl *NodeLabel) 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 *NodeLabel) Filter(ctx context.Context, _ *framework.CycleState, pod *v1.Pod, nodeInfo *nodeinfo.NodeInfo) *framework.Status {
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// Note that NodeLabelPredicate doesn't use predicate metadata, hence passing nil here.
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_, reasons, err := pl.predicate(pod, nil, nodeInfo)
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return migration.PredicateResultToFrameworkStatus(reasons, err)
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}
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