github.com/kubewharf/katalyst-core@v0.5.3/pkg/agent/sysadvisor/metacache/checkpoint.go (about)

     1  /*
     2  Copyright 2022 The Katalyst Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package metacache
    18  
    19  import (
    20  	"encoding/json"
    21  
    22  	"k8s.io/kubernetes/pkg/kubelet/checkpointmanager"
    23  	"k8s.io/kubernetes/pkg/kubelet/checkpointmanager/checksum"
    24  
    25  	"github.com/kubewharf/katalyst-core/pkg/agent/sysadvisor/types"
    26  )
    27  
    28  var _ checkpointmanager.Checkpoint = &MetaCacheCheckpoint{}
    29  
    30  type MetaCacheCheckpoint struct {
    31  	PodEntries    types.PodEntries    `json:"pod_entries"`
    32  	PoolEntries   types.PoolEntries   `json:"pool_entries"`
    33  	RegionEntries types.RegionEntries `json:"region_entries"`
    34  	Checksum      checksum.Checksum   `json:"checksum"`
    35  }
    36  
    37  func NewMetaCacheCheckpoint() *MetaCacheCheckpoint {
    38  	return &MetaCacheCheckpoint{
    39  		PodEntries:    make(types.PodEntries),
    40  		PoolEntries:   make(types.PoolEntries),
    41  		RegionEntries: make(types.RegionEntries),
    42  	}
    43  }
    44  
    45  // MarshalCheckpoint returns marshaled checkpoint
    46  func (cp *MetaCacheCheckpoint) MarshalCheckpoint() ([]byte, error) {
    47  	// make sure checksum wasn't set before so it doesn't affect output checksum
    48  	cp.Checksum = 0
    49  	cp.Checksum = checksum.New(cp)
    50  	return json.Marshal(*cp)
    51  }
    52  
    53  // UnmarshalCheckpoint tries to unmarshal passed bytes to checkpoint
    54  func (cp *MetaCacheCheckpoint) UnmarshalCheckpoint(blob []byte) error {
    55  	return json.Unmarshal(blob, cp)
    56  }
    57  
    58  // VerifyChecksum verifies that current checksum of checkpoint is valid
    59  func (cp *MetaCacheCheckpoint) VerifyChecksum() error {
    60  	ck := cp.Checksum
    61  	cp.Checksum = 0
    62  	err := ck.Verify(cp)
    63  	cp.Checksum = ck
    64  	return err
    65  }