/* Copyright 2018 The Kubernetes Authors. Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. */ package state import ( "encoding/json" "fmt" "hash/fnv" "strings" "k8s.io/apimachinery/pkg/util/dump" "k8s.io/kubernetes/pkg/kubelet/checkpointmanager" "k8s.io/kubernetes/pkg/kubelet/checkpointmanager/checksum" "k8s.io/kubernetes/pkg/kubelet/checkpointmanager/errors" ) var _ checkpointmanager.Checkpoint = &CPUManagerCheckpointV1{} var _ checkpointmanager.Checkpoint = &CPUManagerCheckpointV2{} var _ checkpointmanager.Checkpoint = &CPUManagerCheckpoint{} // CPUManagerCheckpoint struct is used to store cpu/pod assignments in a checkpoint in v2 format type CPUManagerCheckpoint struct { PolicyName string `json:"policyName"` DefaultCPUSet string `json:"defaultCpuSet"` Entries map[string]map[string]string `json:"entries,omitempty"` Checksum checksum.Checksum `json:"checksum"` } // CPUManagerCheckpointV1 struct is used to store cpu/pod assignments in a checkpoint in v1 format type CPUManagerCheckpointV1 struct { PolicyName string `json:"policyName"` DefaultCPUSet string `json:"defaultCpuSet"` Entries map[string]string `json:"entries,omitempty"` Checksum checksum.Checksum `json:"checksum"` } // CPUManagerCheckpointV2 struct is used to store cpu/pod assignments in a checkpoint in v2 format type CPUManagerCheckpointV2 = CPUManagerCheckpoint // NewCPUManagerCheckpoint returns an instance of Checkpoint func NewCPUManagerCheckpoint() *CPUManagerCheckpoint { //nolint:staticcheck // unexported-type-in-api user-facing error message return newCPUManagerCheckpointV2() } func newCPUManagerCheckpointV1() *CPUManagerCheckpointV1 { return &CPUManagerCheckpointV1{ Entries: make(map[string]string), } } func newCPUManagerCheckpointV2() *CPUManagerCheckpointV2 { return &CPUManagerCheckpointV2{ Entries: make(map[string]map[string]string), } } // MarshalCheckpoint returns marshalled checkpoint in v1 format func (cp *CPUManagerCheckpointV1) MarshalCheckpoint() ([]byte, error) { // make sure checksum wasn't set before so it doesn't affect output checksum cp.Checksum = 0 cp.Checksum = checksum.New(cp) return json.Marshal(*cp) } // MarshalCheckpoint returns marshalled checkpoint in v2 format func (cp *CPUManagerCheckpointV2) MarshalCheckpoint() ([]byte, error) { // make sure checksum wasn't set before so it doesn't affect output checksum cp.Checksum = 0 cp.Checksum = checksum.New(cp) return json.Marshal(*cp) } // UnmarshalCheckpoint tries to unmarshal passed bytes to checkpoint in v1 format func (cp *CPUManagerCheckpointV1) UnmarshalCheckpoint(blob []byte) error { return json.Unmarshal(blob, cp) } // UnmarshalCheckpoint tries to unmarshal passed bytes to checkpoint in v2 format func (cp *CPUManagerCheckpointV2) UnmarshalCheckpoint(blob []byte) error { return json.Unmarshal(blob, cp) } // VerifyChecksum verifies that current checksum of checkpoint is valid in v1 format func (cp *CPUManagerCheckpointV1) VerifyChecksum() error { if cp.Checksum == 0 { // accept empty checksum for compatibility with old file backend return nil } ck := cp.Checksum cp.Checksum = 0 object := dump.ForHash(cp) object = strings.Replace(object, "CPUManagerCheckpointV1", "CPUManagerCheckpoint", 1) cp.Checksum = ck hash := fnv.New32a() fmt.Fprintf(hash, "%v", object) if cp.Checksum != checksum.Checksum(hash.Sum32()) { return errors.ErrCorruptCheckpoint } return nil } // VerifyChecksum verifies that current checksum of checkpoint is valid in v2 format func (cp *CPUManagerCheckpointV2) VerifyChecksum() error { if cp.Checksum == 0 { // accept empty checksum for compatibility with old file backend return nil } ck := cp.Checksum cp.Checksum = 0 err := ck.Verify(cp) cp.Checksum = ck return err }