mirror of
https://github.com/optim-enterprises-bv/kubernetes.git
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108 lines
2.7 KiB
Go
108 lines
2.7 KiB
Go
/*
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Copyright 2023 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 state
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import (
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"encoding/json"
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"hash/crc32"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/kubernetes/pkg/kubelet/checkpointmanager/errors"
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)
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const (
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CheckpointAPIGroup = "checkpoint.dra.kubelet.k8s.io"
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CheckpointKind = "DRACheckpoint"
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CheckpointAPIVersion = CheckpointAPIGroup + "/v1"
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)
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// Checkpoint represents a structure to store DRA checkpoint data
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type Checkpoint struct {
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// Data is a JSON serialized checkpoint data
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Data string
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// Checksum is a checksum of Data
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Checksum uint32
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}
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type CheckpointData struct {
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metav1.TypeMeta
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ClaimInfoStateList ClaimInfoStateList
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}
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// NewCheckpoint creates a new checkpoint from a list of claim info states
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func NewCheckpoint(data ClaimInfoStateList) (*Checkpoint, error) {
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cpData := &CheckpointData{
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TypeMeta: metav1.TypeMeta{
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Kind: CheckpointKind,
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APIVersion: CheckpointAPIVersion,
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},
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ClaimInfoStateList: data,
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}
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cpDataBytes, err := json.Marshal(cpData)
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if err != nil {
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return nil, err
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}
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cp := &Checkpoint{
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Data: string(cpDataBytes),
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Checksum: crc32.ChecksumIEEE(cpDataBytes),
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}
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return cp, nil
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}
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// MarshalCheckpoint marshals checkpoint to JSON
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func (cp *Checkpoint) MarshalCheckpoint() ([]byte, error) {
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return json.Marshal(cp)
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}
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// UnmarshalCheckpoint unmarshals checkpoint from JSON
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// and verifies its data checksum
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func (cp *Checkpoint) UnmarshalCheckpoint(blob []byte) error {
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if err := json.Unmarshal(blob, cp); err != nil {
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return err
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}
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// verify checksum
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if err := cp.VerifyChecksum(); err != nil {
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return err
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}
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return nil
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}
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// VerifyChecksum verifies that current checksum
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// of checkpointed Data is valid
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func (cp *Checkpoint) VerifyChecksum() error {
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expectedCS := crc32.ChecksumIEEE([]byte(cp.Data))
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if expectedCS != cp.Checksum {
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return &errors.CorruptCheckpointError{ActualCS: uint64(cp.Checksum), ExpectedCS: uint64(expectedCS)}
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}
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return nil
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}
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// GetClaimInfoStateList returns list of claim info states from checkpoint
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func (cp *Checkpoint) GetClaimInfoStateList() (ClaimInfoStateList, error) {
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var data CheckpointData
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if err := json.Unmarshal([]byte(cp.Data), &data); err != nil {
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return nil, err
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}
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return data.ClaimInfoStateList, nil
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}
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