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88 lines
2.5 KiB
Go
88 lines
2.5 KiB
Go
/*
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Copied from
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https://github.com/kubernetes/kubectl/blob/master/pkg/drain/cordon.go
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at commit f9460c53339c4bb60b20031e3c6125e8bac679e2 to add node cordon feature.
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*/
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/*
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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 kubernetes
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import (
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"encoding/json"
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apiv1 "k8s.io/api/core/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/types"
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"k8s.io/apimachinery/pkg/util/strategicpatch"
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"k8s.io/client-go/kubernetes"
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)
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// CordonHelper wraps functionality to cordon/uncordon nodes
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type cordonHelper struct {
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node *apiv1.Node
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desired bool
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}
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// NewCordonHelper returns a new CordonHelper
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func newCordonHelper(node *apiv1.Node) *cordonHelper {
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return &cordonHelper{
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node: node,
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}
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}
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// UpdateIfRequired returns true if c.node.Spec.Unschedulable isn't already set,
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// or false when no change is needed
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func (c *cordonHelper) updateIfRequired(desired bool) bool {
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c.desired = desired
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return c.node.Spec.Unschedulable != c.desired
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}
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// PatchOrReplace uses given clientset to update the node status, either by patching or
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// updating the given node object; it may return error if the object cannot be encoded as
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// JSON, or if either patch or update calls fail; it will also return a second error
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// whenever creating a patch has failed
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func (c *cordonHelper) patchOrReplace(clientset kubernetes.Interface, serverDryRun bool) (error, error) {
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client := clientset.CoreV1().Nodes()
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oldData, err := json.Marshal(c.node)
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if err != nil {
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return err, nil
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}
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c.node.Spec.Unschedulable = c.desired
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newData, err := json.Marshal(c.node)
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if err != nil {
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return err, nil
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}
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patchBytes, patchErr := strategicpatch.CreateTwoWayMergePatch(oldData, newData, c.node)
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if patchErr == nil {
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_, err = client.Patch(c.node.Name, types.StrategicMergePatchType, patchBytes)
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} else {
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updateOptions := metav1.UpdateOptions{}
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if serverDryRun {
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updateOptions.DryRun = []string{metav1.DryRunAll}
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}
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_, err = client.Update(c.node)
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}
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return err, patchErr
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}
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