148 lines
3.8 KiB
Go
148 lines
3.8 KiB
Go
/*
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Copyright The containerd 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 boltutil
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import (
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"time"
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"github.com/pkg/errors"
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bolt "go.etcd.io/bbolt"
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)
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var (
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bucketKeyAnnotations = []byte("annotations")
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bucketKeyLabels = []byte("labels")
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bucketKeyCreatedAt = []byte("createdat")
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bucketKeyUpdatedAt = []byte("updatedat")
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)
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// ReadLabels reads the labels key from the bucket
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// Uses the key "labels"
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func ReadLabels(bkt *bolt.Bucket) (map[string]string, error) {
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return readMap(bkt, bucketKeyLabels)
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}
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// ReadAnnotations reads the OCI Descriptor Annotations key from the bucket
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// Uses the key "annotations"
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func ReadAnnotations(bkt *bolt.Bucket) (map[string]string, error) {
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return readMap(bkt, bucketKeyAnnotations)
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}
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func readMap(bkt *bolt.Bucket, bucketName []byte) (map[string]string, error) {
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lbkt := bkt.Bucket(bucketName)
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if lbkt == nil {
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return nil, nil
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}
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labels := map[string]string{}
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if err := lbkt.ForEach(func(k, v []byte) error {
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labels[string(k)] = string(v)
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return nil
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}); err != nil {
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return nil, err
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}
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return labels, nil
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}
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// WriteLabels will write a new labels bucket to the provided bucket at key
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// bucketKeyLabels, replacing the contents of the bucket with the provided map.
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//
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// The provide map labels will be modified to have the final contents of the
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// bucket. Typically, this removes zero-value entries.
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// Uses the key "labels"
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func WriteLabels(bkt *bolt.Bucket, labels map[string]string) error {
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return writeMap(bkt, bucketKeyLabels, labels)
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}
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// WriteAnnotations writes the OCI Descriptor Annotations
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func WriteAnnotations(bkt *bolt.Bucket, labels map[string]string) error {
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return writeMap(bkt, bucketKeyAnnotations, labels)
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}
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func writeMap(bkt *bolt.Bucket, bucketName []byte, labels map[string]string) error {
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// Remove existing labels to keep from merging
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if lbkt := bkt.Bucket(bucketName); lbkt != nil {
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if err := bkt.DeleteBucket(bucketName); err != nil {
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return err
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}
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}
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if len(labels) == 0 {
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return nil
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}
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lbkt, err := bkt.CreateBucket(bucketName)
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if err != nil {
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return err
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}
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for k, v := range labels {
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if v == "" {
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delete(labels, k) // remove since we don't actually set it
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continue
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}
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if err := lbkt.Put([]byte(k), []byte(v)); err != nil {
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return errors.Wrapf(err, "failed to set label %q=%q", k, v)
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}
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}
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return nil
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}
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// ReadTimestamps reads created and updated timestamps from a bucket.
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// Uses keys "createdat" and "updatedat"
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func ReadTimestamps(bkt *bolt.Bucket, created, updated *time.Time) error {
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for _, f := range []struct {
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b []byte
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t *time.Time
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}{
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{bucketKeyCreatedAt, created},
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{bucketKeyUpdatedAt, updated},
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} {
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v := bkt.Get(f.b)
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if v != nil {
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if err := f.t.UnmarshalBinary(v); err != nil {
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return err
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}
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}
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}
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return nil
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}
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// WriteTimestamps writes created and updated timestamps to a bucket.
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// Uses keys "createdat" and "updatedat"
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func WriteTimestamps(bkt *bolt.Bucket, created, updated time.Time) error {
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createdAt, err := created.MarshalBinary()
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if err != nil {
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return err
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}
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updatedAt, err := updated.MarshalBinary()
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if err != nil {
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return err
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}
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for _, v := range [][2][]byte{
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{bucketKeyCreatedAt, createdAt},
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{bucketKeyUpdatedAt, updatedAt},
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} {
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if err := bkt.Put(v[0], v[1]); err != nil {
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return err
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}
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}
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return nil
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}
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