mirror of https://github.com/k3s-io/k3s
98 lines
2.8 KiB
Go
98 lines
2.8 KiB
Go
/*
|
|
Copyright 2019 The Kubernetes Authors.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package drain
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
corev1 "k8s.io/api/core/v1"
|
|
"k8s.io/apimachinery/pkg/runtime"
|
|
"k8s.io/apimachinery/pkg/runtime/schema"
|
|
|
|
"k8s.io/apimachinery/pkg/types"
|
|
"k8s.io/apimachinery/pkg/util/json"
|
|
"k8s.io/apimachinery/pkg/util/strategicpatch"
|
|
"k8s.io/client-go/kubernetes"
|
|
)
|
|
|
|
// CordonHelper wraps functionality to cordon/uncordon nodes
|
|
type CordonHelper struct {
|
|
node *corev1.Node
|
|
desired bool
|
|
}
|
|
|
|
// NewCordonHelper returns a new CordonHelper
|
|
func NewCordonHelper(node *corev1.Node) *CordonHelper {
|
|
return &CordonHelper{
|
|
node: node,
|
|
}
|
|
}
|
|
|
|
// NewCordonHelperFromRuntimeObject returns a new CordonHelper, or an error if given object is not a
|
|
// node or cannot be encoded as JSON
|
|
func NewCordonHelperFromRuntimeObject(nodeObject runtime.Object, scheme *runtime.Scheme, gvk schema.GroupVersionKind) (*CordonHelper, error) {
|
|
nodeObject, err := scheme.ConvertToVersion(nodeObject, gvk.GroupVersion())
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
node, ok := nodeObject.(*corev1.Node)
|
|
if !ok {
|
|
return nil, fmt.Errorf("unexpected type %T", nodeObject)
|
|
}
|
|
|
|
return NewCordonHelper(node), nil
|
|
}
|
|
|
|
// UpdateIfRequired returns true if c.node.Spec.Unschedulable isn't already set,
|
|
// or false when no change is needed
|
|
func (c *CordonHelper) UpdateIfRequired(desired bool) bool {
|
|
c.desired = desired
|
|
if c.node.Spec.Unschedulable == c.desired {
|
|
return false
|
|
}
|
|
return true
|
|
}
|
|
|
|
// PatchOrReplace uses given clientset to update the node status, either by patching or
|
|
// updating the given node object; it may return error if the object cannot be encoded as
|
|
// JSON, or if either patch or update calls fail; it will also return a second error
|
|
// whenever creating a patch has failed
|
|
func (c *CordonHelper) PatchOrReplace(clientset kubernetes.Interface) (error, error) {
|
|
client := clientset.CoreV1().Nodes()
|
|
|
|
oldData, err := json.Marshal(c.node)
|
|
if err != nil {
|
|
return err, nil
|
|
}
|
|
|
|
c.node.Spec.Unschedulable = c.desired
|
|
|
|
newData, err := json.Marshal(c.node)
|
|
if err != nil {
|
|
return err, nil
|
|
}
|
|
|
|
patchBytes, patchErr := strategicpatch.CreateTwoWayMergePatch(oldData, newData, c.node)
|
|
if patchErr == nil {
|
|
_, err = client.Patch(c.node.Name, types.StrategicMergePatchType, patchBytes)
|
|
} else {
|
|
_, err = client.Update(c.node)
|
|
}
|
|
return err, patchErr
|
|
}
|