mirror of https://github.com/k3s-io/k3s
89 lines
2.6 KiB
Go
89 lines
2.6 KiB
Go
/*
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Copyright 2017 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 checkpoint
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import (
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"fmt"
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apiv1 "k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/kubernetes/pkg/kubelet/apis/kubeletconfig"
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utilcodec "k8s.io/kubernetes/pkg/kubelet/kubeletconfig/util/codec"
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)
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const configMapConfigKey = "kubelet"
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// configMapCheckpoint implements Checkpoint, backed by a v1/ConfigMap config source object
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type configMapCheckpoint struct {
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configMap *apiv1.ConfigMap
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}
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// NewConfigMapCheckpoint returns a Checkpoint backed by `cm`. `cm` must be non-nil
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// and have a non-empty ObjectMeta.UID, or an error will be returned.
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func NewConfigMapCheckpoint(cm *apiv1.ConfigMap) (Checkpoint, error) {
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if cm == nil {
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return nil, fmt.Errorf("ConfigMap must be non-nil to be treated as a Checkpoint")
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} else if len(cm.ObjectMeta.UID) == 0 {
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return nil, fmt.Errorf("ConfigMap must have a UID to be treated as a Checkpoint")
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}
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return &configMapCheckpoint{cm}, nil
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}
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// UID returns the UID of a configMapCheckpoint
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func (c *configMapCheckpoint) UID() string {
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return string(c.configMap.UID)
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}
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// implements Parse for v1/ConfigMap checkpoints
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func (c *configMapCheckpoint) Parse() (*kubeletconfig.KubeletConfiguration, error) {
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const emptyCfgErr = "config was empty, but some parameters are required"
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cm := c.configMap
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if len(cm.Data) == 0 {
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return nil, fmt.Errorf(emptyCfgErr)
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}
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// TODO(mtaufen): Once the KubeletConfiguration type is decomposed, extend this to a key for each sub-object
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config, ok := cm.Data[configMapConfigKey]
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if !ok {
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return nil, fmt.Errorf("key %q not found in ConfigMap", configMapConfigKey)
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} else if len(config) == 0 {
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return nil, fmt.Errorf(emptyCfgErr)
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}
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return utilcodec.DecodeKubeletConfiguration([]byte(config))
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}
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// Encode encodes a configMapCheckpoint
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func (c *configMapCheckpoint) Encode() ([]byte, error) {
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cm := c.configMap
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encoder, err := utilcodec.NewJSONEncoder(apiv1.GroupName)
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if err != nil {
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return nil, err
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}
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data, err := runtime.Encode(encoder, cm)
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if err != nil {
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return nil, err
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}
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return data, nil
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}
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func (c *configMapCheckpoint) object() interface{} {
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return c.configMap
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}
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