checkpoint.go

Documentation: k8s.io/kubernetes/pkg/kubelet/cm/memorymanager/state

     1  /*
     2  Copyright 2020 The Kubernetes 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 state
    18  
    19  import (
    20  	"encoding/json"
    21  
    22  	"k8s.io/kubernetes/pkg/kubelet/checkpointmanager"
    23  	"k8s.io/kubernetes/pkg/kubelet/checkpointmanager/checksum"
    24  )
    25  
    26  var _ checkpointmanager.Checkpoint = &MemoryManagerCheckpoint{}
    27  
    28  // MemoryManagerCheckpoint struct is used to store memory/pod assignments in a checkpoint
    29  type MemoryManagerCheckpoint struct {
    30  	PolicyName   string                     `json:"policyName"`
    31  	MachineState NUMANodeMap                `json:"machineState"`
    32  	Entries      ContainerMemoryAssignments `json:"entries,omitempty"`
    33  	Checksum     checksum.Checksum          `json:"checksum"`
    34  }
    35  
    36  // NewMemoryManagerCheckpoint returns an instance of Checkpoint
    37  func NewMemoryManagerCheckpoint() *MemoryManagerCheckpoint {
    38  	//nolint:staticcheck // unexported-type-in-api user-facing error message
    39  	return &MemoryManagerCheckpoint{
    40  		Entries:      ContainerMemoryAssignments{},
    41  		MachineState: NUMANodeMap{},
    42  	}
    43  }
    44  
    45  // MarshalCheckpoint returns marshalled checkpoint
    46  func (mp *MemoryManagerCheckpoint) MarshalCheckpoint() ([]byte, error) {
    47  	// make sure checksum wasn't set before so it doesn't affect output checksum
    48  	mp.Checksum = 0
    49  	mp.Checksum = checksum.New(mp)
    50  	return json.Marshal(*mp)
    51  }
    52  
    53  // UnmarshalCheckpoint tries to unmarshal passed bytes to checkpoint
    54  func (mp *MemoryManagerCheckpoint) UnmarshalCheckpoint(blob []byte) error {
    55  	return json.Unmarshal(blob, mp)
    56  }
    57  
    58  // VerifyChecksum verifies that current checksum of checkpoint is valid
    59  func (mp *MemoryManagerCheckpoint) VerifyChecksum() error {
    60  	ck := mp.Checksum
    61  	mp.Checksum = 0
    62  	err := ck.Verify(mp)
    63  	mp.Checksum = ck
    64  	return err
    65  }
    66
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