mirror of https://github.com/k3s-io/k3s
73 lines
2.6 KiB
Go
73 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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apiequality "k8s.io/apimachinery/pkg/api/equality"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/kubernetes/pkg/api/legacyscheme"
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"k8s.io/kubernetes/pkg/kubelet/apis/kubeletconfig"
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)
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// Checkpoint represents a local copy of a config source (payload) object
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type Checkpoint interface {
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// UID returns the UID of the config source object behind the Checkpoint
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UID() string
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// Parse extracts the KubeletConfiguration from the checkpoint, applies defaults, and converts to the internal type
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Parse() (*kubeletconfig.KubeletConfiguration, error)
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// Encode returns a []byte representation of the config source object behind the Checkpoint
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Encode() ([]byte, error)
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// object returns the underlying checkpointed object. If you want to compare sources for equality, use EqualCheckpoints,
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// which compares the underlying checkpointed objects for semantic API equality.
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object() interface{}
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}
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// DecodeCheckpoint is a helper for using the apimachinery to decode serialized checkpoints
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func DecodeCheckpoint(data []byte) (Checkpoint, error) {
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// decode the checkpoint
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obj, err := runtime.Decode(legacyscheme.Codecs.UniversalDecoder(), data)
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if err != nil {
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return nil, fmt.Errorf("failed to decode, error: %v", err)
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}
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// TODO(mtaufen): for now we assume we are trying to load a ConfigMap checkpoint, may need to extend this if we allow other checkpoint types
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// convert it to the external ConfigMap type, so we're consistently working with the external type outside of the on-disk representation
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cm := &apiv1.ConfigMap{}
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err = legacyscheme.Scheme.Convert(obj, cm, nil)
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if err != nil {
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return nil, fmt.Errorf("failed to convert decoded object into a v1 ConfigMap, error: %v", err)
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}
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return NewConfigMapCheckpoint(cm)
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}
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// EqualCheckpoints compares two Checkpoints for equality, if their underlying objects are equal, so are the Checkpoints
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func EqualCheckpoints(a, b Checkpoint) bool {
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if a != nil && b != nil {
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return apiequality.Semantic.DeepEqual(a.object(), b.object())
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}
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if a == nil && b == nil {
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return true
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}
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return false
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}
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