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