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buckets.go
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buckets.go
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package metadata
import (
"github.com/boltdb/bolt"
digest "github.com/opencontainers/go-digest"
)
// The layout where a "/" delineates a bucket is desribed in the following
// section. Please try to follow this as closely as possible when adding
// functionality. We can bolster this with helpers and more structure if that
// becomes an issue.
//
// Generically, we try to do the following:
//
// <version>/<namespace>/<object>/<key> -> <field>
//
// version: Currently, this is "v1". Additions can be made to v1 in a backwards
// compatible way. If the layout changes, a new version must be made, along
// with a migration.
//
// namespace: the namespace to which this object belongs.
//
// object: defines which object set is stored in the bucket. There are two
// special objects, "labels" and "indexes". The "labels" bucket stores the
// labels for the parent namespace. The "indexes" object is reserved for
// indexing objects, if we require in the future.
//
// key: object-specific key identifying the storage bucket for the objects
// contents.
var (
bucketKeyVersion = []byte("v1")
bucketKeyObjectLabels = []byte("labels") // stores the labels for a namespace.
bucketKeyObjectIndexes = []byte("indexes") // reserved
bucketKeyObjectImages = []byte("images") // stores image objects
bucketKeyObjectContainers = []byte("containers") // stores container objects
bucketKeyObjectSnapshots = []byte("snapshots") // stores snapshot references
bucketKeyObjectContent = []byte("content") // stores content references
bucketKeyObjectBlob = []byte("blob") // stores content links
bucketKeyObjectIngest = []byte("ingest") // stores ingest links
bucketKeyDigest = []byte("digest")
bucketKeyMediaType = []byte("mediatype")
bucketKeySize = []byte("size")
bucketKeyLabels = []byte("labels")
bucketKeyImage = []byte("image")
bucketKeyRuntime = []byte("runtime")
bucketKeyName = []byte("name")
bucketKeyOptions = []byte("options")
bucketKeySpec = []byte("spec")
bucketKeyRootFS = []byte("rootfs")
bucketKeyTarget = []byte("target")
bucketKeyCreatedAt = []byte("createdat")
bucketKeyUpdatedAt = []byte("updatedat")
)
func getBucket(tx *bolt.Tx, keys ...[]byte) *bolt.Bucket {
bkt := tx.Bucket(keys[0])
for _, key := range keys[1:] {
if bkt == nil {
break
}
bkt = bkt.Bucket(key)
}
return bkt
}
func createBucketIfNotExists(tx *bolt.Tx, keys ...[]byte) (*bolt.Bucket, error) {
bkt, err := tx.CreateBucketIfNotExists(keys[0])
if err != nil {
return nil, err
}
for _, key := range keys[1:] {
bkt, err = bkt.CreateBucketIfNotExists(key)
if err != nil {
return nil, err
}
}
return bkt, nil
}
func namespaceLabelsBucketPath(namespace string) [][]byte {
return [][]byte{bucketKeyVersion, []byte(namespace), bucketKeyObjectLabels}
}
func withNamespacesLabelsBucket(tx *bolt.Tx, namespace string, fn func(bkt *bolt.Bucket) error) error {
bkt, err := createBucketIfNotExists(tx, namespaceLabelsBucketPath(namespace)...)
if err != nil {
return err
}
return fn(bkt)
}
func getNamespaceLabelsBucket(tx *bolt.Tx, namespace string) *bolt.Bucket {
return getBucket(tx, namespaceLabelsBucketPath(namespace)...)
}
func imagesBucketPath(namespace string) [][]byte {
return [][]byte{bucketKeyVersion, []byte(namespace), bucketKeyObjectImages}
}
func withImagesBucket(tx *bolt.Tx, namespace string, fn func(bkt *bolt.Bucket) error) error {
bkt, err := createBucketIfNotExists(tx, imagesBucketPath(namespace)...)
if err != nil {
return err
}
return fn(bkt)
}
func getImagesBucket(tx *bolt.Tx, namespace string) *bolt.Bucket {
return getBucket(tx, imagesBucketPath(namespace)...)
}
func createContainersBucket(tx *bolt.Tx, namespace string) (*bolt.Bucket, error) {
bkt, err := createBucketIfNotExists(tx, bucketKeyVersion, []byte(namespace), bucketKeyObjectContainers)
if err != nil {
return nil, err
}
return bkt, nil
}
func getContainersBucket(tx *bolt.Tx, namespace string) *bolt.Bucket {
return getBucket(tx, bucketKeyVersion, []byte(namespace), bucketKeyObjectContainers)
}
func getContainerBucket(tx *bolt.Tx, namespace, id string) *bolt.Bucket {
return getBucket(tx, bucketKeyVersion, []byte(namespace), bucketKeyObjectContainers, []byte(id))
}
func createSnapshotterBucket(tx *bolt.Tx, namespace, snapshotter string) (*bolt.Bucket, error) {
bkt, err := createBucketIfNotExists(tx, bucketKeyVersion, []byte(namespace), bucketKeyObjectSnapshots, []byte(snapshotter))
if err != nil {
return nil, err
}
return bkt, nil
}
func getSnapshotterBucket(tx *bolt.Tx, namespace, snapshotter string) *bolt.Bucket {
return getBucket(tx, bucketKeyVersion, []byte(namespace), bucketKeyObjectSnapshots, []byte(snapshotter))
}
func createBlobBucket(tx *bolt.Tx, namespace string, dgst digest.Digest) (*bolt.Bucket, error) {
bkt, err := createBucketIfNotExists(tx, bucketKeyVersion, []byte(namespace), bucketKeyObjectContent, bucketKeyObjectBlob, []byte(dgst.String()))
if err != nil {
return nil, err
}
return bkt, nil
}
func getBlobsBucket(tx *bolt.Tx, namespace string) *bolt.Bucket {
return getBucket(tx, bucketKeyVersion, []byte(namespace), bucketKeyObjectContent, bucketKeyObjectBlob)
}
func getBlobBucket(tx *bolt.Tx, namespace string, dgst digest.Digest) *bolt.Bucket {
return getBucket(tx, bucketKeyVersion, []byte(namespace), bucketKeyObjectContent, bucketKeyObjectBlob, []byte(dgst.String()))
}
func createIngestBucket(tx *bolt.Tx, namespace string) (*bolt.Bucket, error) {
bkt, err := createBucketIfNotExists(tx, bucketKeyVersion, []byte(namespace), bucketKeyObjectContent, bucketKeyObjectIngest)
if err != nil {
return nil, err
}
return bkt, nil
}
func getIngestBucket(tx *bolt.Tx, namespace string) *bolt.Bucket {
return getBucket(tx, bucketKeyVersion, []byte(namespace), bucketKeyObjectContent, bucketKeyObjectIngest)
}