ad72036e58
Moves label and timestamp bolt functions to subpackage for use outside the metadata package without importing metadata package. Signed-off-by: Derek McGowan <derek@mcgstyle.net>
112 lines
2.5 KiB
Go
112 lines
2.5 KiB
Go
package boltutil
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import (
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"time"
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"github.com/boltdb/bolt"
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"github.com/pkg/errors"
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)
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var (
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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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lbkt := bkt.Bucket(bucketKeyLabels)
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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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// Remove existing labels to keep from merging
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if lbkt := bkt.Bucket(bucketKeyLabels); lbkt != nil {
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if err := bkt.DeleteBucket(bucketKeyLabels); 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(bucketKeyLabels)
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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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