77 lines
2.0 KiB
Go
77 lines
2.0 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 container
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import (
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"encoding/json"
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"fmt"
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"k8s.io/kubernetes/pkg/kubelet/apis/cri/v1alpha1/runtime"
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)
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// NOTE(random-liu):
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// 1) Metadata is immutable after created.
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// 2) Metadata is checkpointed as containerd container label.
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// metadataVersion is current version of container metadata.
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const metadataVersion = "v1" // nolint
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// versionedMetadata is the internal versioned container metadata.
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// nolint
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type versionedMetadata struct {
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// Version indicates the version of the versioned container metadata.
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Version string
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Metadata
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}
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// Metadata is the unversioned container metadata.
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type Metadata struct {
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// ID is the container id.
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ID string
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// Name is the container name.
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Name string
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// SandboxID is the sandbox id the container belongs to.
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SandboxID string
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// Config is the CRI container config.
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Config *runtime.ContainerConfig
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// ImageRef is the reference of image used by the container.
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ImageRef string
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}
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// Encode encodes Metadata into bytes in json format.
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func (c *Metadata) Encode() ([]byte, error) {
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return json.Marshal(&versionedMetadata{
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Version: metadataVersion,
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Metadata: *c,
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})
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}
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// Decode decodes Metadata from bytes.
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func (c *Metadata) Decode(data []byte) error {
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versioned := &versionedMetadata{}
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if err := json.Unmarshal(data, versioned); err != nil {
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return err
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}
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// Handle old version after upgrade.
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switch versioned.Version {
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case metadataVersion:
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*c = versioned.Metadata
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return nil
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}
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return fmt.Errorf("unsupported version")
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}
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