mirror of https://github.com/k3s-io/k3s
63 lines
2.0 KiB
Go
63 lines
2.0 KiB
Go
/*
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Copyright 2018 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 examples
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import (
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"fmt"
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"k8s.io/api/core/v1"
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plugins "k8s.io/kubernetes/pkg/scheduler/plugins/v1alpha1"
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)
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// MultipointCommunicatingPlugin is an example of a plugin that implements two
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// extension points. It communicates through pluginContext with another function.
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type MultipointCommunicatingPlugin struct{}
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var _ = plugins.ReservePlugin(MultipointCommunicatingPlugin{})
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// Name returns name of the plugin. It is used in logs, etc.
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func (mc MultipointCommunicatingPlugin) Name() string {
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return "multipoint-communicating-plugin"
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}
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// Reserve is the functions invoked by the framework at "reserve" extension point.
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func (mc MultipointCommunicatingPlugin) Reserve(ps plugins.PluginSet, pod *v1.Pod, nodeName string) error {
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if pod == nil {
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return fmt.Errorf("pod cannot be nil")
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}
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if pod.Name == "my-test-pod" {
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ps.Data().Ctx.SyncWrite(plugins.ContextKey(pod.Name), "never bind")
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}
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return nil
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}
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// Prebind is the functions invoked by the framework at "prebind" extension point.
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func (mc MultipointCommunicatingPlugin) Prebind(ps plugins.PluginSet, pod *v1.Pod, nodeName string) (bool, error) {
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if pod == nil {
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return false, fmt.Errorf("pod cannot be nil")
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}
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if v, e := ps.Data().Ctx.SyncRead(plugins.ContextKey(pod.Name)); e == nil && v == "never bind" {
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return false, nil
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}
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return true, nil
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}
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// NewMultipointCommunicatingPlugin initializes a new plugin and returns it.
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func NewMultipointCommunicatingPlugin() *MultipointCommunicatingPlugin {
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return &MultipointCommunicatingPlugin{}
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}
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