105 lines
3.2 KiB
Go
105 lines
3.2 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 interpodaffinity
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import (
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"fmt"
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"sync"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/util/validation/field"
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framework "k8s.io/kubernetes/pkg/scheduler/framework/v1alpha1"
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"k8s.io/utils/pointer"
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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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// DefaultHardPodAffinityWeight is the default HardPodAffinityWeight.
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DefaultHardPodAffinityWeight int32 = 1
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// MinHardPodAffinityWeight is the minimum HardPodAffinityWeight.
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MinHardPodAffinityWeight int32 = 0
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// MaxHardPodAffinityWeight is the maximum HardPodAffinityWeight.
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MaxHardPodAffinityWeight int32 = 100
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)
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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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// HardPodAffinityWeight is the scoring weight for existing pods with a
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// matching hard affinity to the incoming pod.
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HardPodAffinityWeight *int32 `json:"hardPodAffinityWeight,omitempty"`
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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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Args
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sharedLister framework.SharedLister
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sync.Mutex
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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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// BuildArgs returns the args that were used to build the plugin.
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func (pl *InterPodAffinity) BuildArgs() interface{} {
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return pl.Args
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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, h framework.FrameworkHandle) (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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pl := &InterPodAffinity{
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sharedLister: h.SnapshotSharedLister(),
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}
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if err := framework.DecodeInto(plArgs, &pl.Args); err != nil {
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return nil, err
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}
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if err := validateArgs(&pl.Args); err != nil {
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return nil, err
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}
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if pl.HardPodAffinityWeight == nil {
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pl.HardPodAffinityWeight = pointer.Int32Ptr(DefaultHardPodAffinityWeight)
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}
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return pl, nil
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}
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func validateArgs(args *Args) error {
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if args.HardPodAffinityWeight == nil {
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return nil
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}
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return ValidateHardPodAffinityWeight(field.NewPath("hardPodAffinityWeight"), *args.HardPodAffinityWeight)
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}
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// ValidateHardPodAffinityWeight validates that weight is within allowed range.
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func ValidateHardPodAffinityWeight(path *field.Path, w int32) error {
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if w < MinHardPodAffinityWeight || w > MaxHardPodAffinityWeight {
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msg := fmt.Sprintf("not in valid range [%d-%d]", MinHardPodAffinityWeight, MaxHardPodAffinityWeight)
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return field.Invalid(path, w, msg)
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}
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return nil
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}
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