/
metadata.go
110 lines (94 loc) · 2.49 KB
/
metadata.go
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// Copyright 2019 Netflix, Inc.
//
// 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 oci
import (
"encoding/binary"
"fmt"
"github.com/Netflix/p2plab/errdefs"
digest "github.com/opencontainers/go-digest"
ocispec "github.com/opencontainers/image-spec/specs-go/v1"
bolt "go.etcd.io/bbolt"
)
var (
bucketKeyDigest = []byte("digest")
bucketKeyMediaType = []byte("mediaType")
bucketKeySize = []byte("size")
)
func (t *transformer) get(dgst digest.Digest) (desc ocispec.Descriptor, err error) {
err = t.db.View(func(tx *bolt.Tx) error {
bkt := tx.Bucket([]byte(dgst.String()))
if bkt == nil {
return errdefs.ErrNotFound
}
return bkt.ForEach(func(k, v []byte) error {
if v == nil {
return nil
}
switch string(k) {
case string(bucketKeyDigest):
desc.Digest = digest.Digest(v)
case string(bucketKeyMediaType):
desc.MediaType = string(v)
case string(bucketKeySize):
desc.Size, _ = binary.Varint(v)
}
return nil
})
})
if err != nil {
return desc, err
}
return desc, nil
}
func (t *transformer) put(dgst digest.Digest, desc ocispec.Descriptor) error {
return t.db.Update(func(tx *bolt.Tx) error {
bkt := tx.Bucket([]byte(dgst.String()))
if bkt != nil {
err := tx.DeleteBucket([]byte(dgst.String()))
if err != nil {
return err
}
}
var err error
bkt, err = tx.CreateBucket([]byte(dgst.String()))
if err != nil {
return err
}
sizeEncoded, err := encodeInt(desc.Size)
if err != nil {
return err
}
for _, v := range [][2][]byte{
{bucketKeyDigest, []byte(desc.Digest)},
{bucketKeyMediaType, []byte(desc.MediaType)},
{bucketKeySize, sizeEncoded},
} {
if err := bkt.Put(v[0], v[1]); err != nil {
return err
}
}
return nil
})
}
func encodeInt(i int64) ([]byte, error) {
var (
buf [binary.MaxVarintLen64]byte
encoded = buf[:]
)
encoded = encoded[:binary.PutVarint(encoded, i)]
if len(encoded) == 0 {
return nil, fmt.Errorf("failed encoding integer = %v", i)
}
return encoded, nil
}