59 lines
1.8 KiB
Go
59 lines
1.8 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 podtopologyspread
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import (
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"fmt"
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"k8s.io/apimachinery/pkg/runtime"
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framework "k8s.io/kubernetes/pkg/scheduler/framework/v1alpha1"
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schedulerlisters "k8s.io/kubernetes/pkg/scheduler/listers"
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)
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const (
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// ErrReasonConstraintsNotMatch is used for PodTopologySpread filter error.
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ErrReasonConstraintsNotMatch = "node(s) didn't match pod topology spread constraints"
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)
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// PodTopologySpread is a plugin that ensures pod's topologySpreadConstraints is satisfied.
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type PodTopologySpread struct {
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sharedLister schedulerlisters.SharedLister
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}
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var _ framework.PreFilterPlugin = &PodTopologySpread{}
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var _ framework.FilterPlugin = &PodTopologySpread{}
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var _ framework.PostFilterPlugin = &PodTopologySpread{}
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var _ framework.ScorePlugin = &PodTopologySpread{}
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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 = "PodTopologySpread"
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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 *PodTopologySpread) 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(_ *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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return &PodTopologySpread{sharedLister: h.SnapshotSharedLister()}, nil
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}
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