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images.go
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images.go
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package metadata
import (
"context"
"encoding/binary"
"fmt"
"strings"
"time"
"github.com/boltdb/bolt"
"github.com/containerd/containerd/errdefs"
"github.com/containerd/containerd/filters"
"github.com/containerd/containerd/images"
"github.com/containerd/containerd/metadata/boltutil"
"github.com/containerd/containerd/namespaces"
digest "github.com/opencontainers/go-digest"
"github.com/pkg/errors"
)
type imageStore struct {
tx *bolt.Tx
}
func NewImageStore(tx *bolt.Tx) images.Store {
return &imageStore{tx: tx}
}
func (s *imageStore) Get(ctx context.Context, name string) (images.Image, error) {
var image images.Image
namespace, err := namespaces.NamespaceRequired(ctx)
if err != nil {
return images.Image{}, err
}
bkt := getImagesBucket(s.tx, namespace)
if bkt == nil {
return images.Image{}, errors.Wrapf(errdefs.ErrNotFound, "image %q", name)
}
ibkt := bkt.Bucket([]byte(name))
if ibkt == nil {
return images.Image{}, errors.Wrapf(errdefs.ErrNotFound, "image %q", name)
}
image.Name = name
if err := readImage(&image, ibkt); err != nil {
return images.Image{}, errors.Wrapf(err, "image %q", name)
}
return image, nil
}
func (s *imageStore) List(ctx context.Context, fs ...string) ([]images.Image, error) {
namespace, err := namespaces.NamespaceRequired(ctx)
if err != nil {
return nil, err
}
filter, err := filters.ParseAll(fs...)
if err != nil {
return nil, errors.Wrapf(errdefs.ErrInvalidArgument, err.Error())
}
bkt := getImagesBucket(s.tx, namespace)
if bkt == nil {
return nil, nil // empty store
}
var m []images.Image
if err := bkt.ForEach(func(k, v []byte) error {
var (
image = images.Image{
Name: string(k),
}
kbkt = bkt.Bucket(k)
)
if err := readImage(&image, kbkt); err != nil {
return err
}
if filter.Match(adaptImage(image)) {
m = append(m, image)
}
return nil
}); err != nil {
return nil, err
}
return m, nil
}
func (s *imageStore) Create(ctx context.Context, image images.Image) (images.Image, error) {
namespace, err := namespaces.NamespaceRequired(ctx)
if err != nil {
return images.Image{}, err
}
if image.Name == "" {
return images.Image{}, errors.Wrapf(errdefs.ErrInvalidArgument, "image name is required for create")
}
return image, withImagesBucket(s.tx, namespace, func(bkt *bolt.Bucket) error {
ibkt, err := bkt.CreateBucket([]byte(image.Name))
if err != nil {
if err != bolt.ErrBucketExists {
return err
}
return errors.Wrapf(errdefs.ErrAlreadyExists, "image %q", image.Name)
}
image.CreatedAt = time.Now().UTC()
image.UpdatedAt = image.CreatedAt
return writeImage(ibkt, &image)
})
}
func (s *imageStore) Update(ctx context.Context, image images.Image, fieldpaths ...string) (images.Image, error) {
namespace, err := namespaces.NamespaceRequired(ctx)
if err != nil {
return images.Image{}, err
}
if image.Name == "" {
return images.Image{}, errors.Wrapf(errdefs.ErrInvalidArgument, "image name is required for update")
}
var updated images.Image
return updated, withImagesBucket(s.tx, namespace, func(bkt *bolt.Bucket) error {
ibkt := bkt.Bucket([]byte(image.Name))
if ibkt == nil {
return errors.Wrapf(errdefs.ErrNotFound, "image %q", image.Name)
}
if err := readImage(&updated, ibkt); err != nil {
return errors.Wrapf(err, "image %q", image.Name)
}
createdat := updated.CreatedAt
updated.Name = image.Name
if len(fieldpaths) > 0 {
for _, path := range fieldpaths {
if strings.HasPrefix(path, "labels.") {
if updated.Labels == nil {
updated.Labels = map[string]string{}
}
key := strings.TrimPrefix(path, "labels.")
updated.Labels[key] = image.Labels[key]
continue
}
switch path {
case "labels":
updated.Labels = image.Labels
case "target":
// NOTE(stevvooe): While we allow setting individual labels, we
// only support replacing the target as a unit, since that is
// commonly pulled as a unit from other sources. It often doesn't
// make sense to modify the size or digest without touching the
// mediatype, as well, for example.
updated.Target = image.Target
default:
return errors.Wrapf(errdefs.ErrInvalidArgument, "cannot update %q field on image %q", path, image.Name)
}
}
} else {
updated = image
}
updated.CreatedAt = createdat
updated.UpdatedAt = time.Now().UTC()
return writeImage(ibkt, &updated)
})
}
func (s *imageStore) Delete(ctx context.Context, name string) error {
namespace, err := namespaces.NamespaceRequired(ctx)
if err != nil {
return err
}
return withImagesBucket(s.tx, namespace, func(bkt *bolt.Bucket) error {
err := bkt.DeleteBucket([]byte(name))
if err == bolt.ErrBucketNotFound {
return errors.Wrapf(errdefs.ErrNotFound, "image %q", name)
}
return err
})
}
func readImage(image *images.Image, bkt *bolt.Bucket) error {
if err := boltutil.ReadTimestamps(bkt, &image.CreatedAt, &image.UpdatedAt); err != nil {
return err
}
labels, err := boltutil.ReadLabels(bkt)
if err != nil {
return err
}
image.Labels = labels
tbkt := bkt.Bucket(bucketKeyTarget)
if tbkt == nil {
return errors.New("unable to read target bucket")
}
return tbkt.ForEach(func(k, v []byte) error {
if v == nil {
return nil // skip it? a bkt maybe?
}
// TODO(stevvooe): This is why we need to use byte values for
// keys, rather than full arrays.
switch string(k) {
case string(bucketKeyDigest):
image.Target.Digest = digest.Digest(v)
case string(bucketKeyMediaType):
image.Target.MediaType = string(v)
case string(bucketKeySize):
image.Target.Size, _ = binary.Varint(v)
}
return nil
})
}
func writeImage(bkt *bolt.Bucket, image *images.Image) error {
if err := boltutil.WriteTimestamps(bkt, image.CreatedAt, image.UpdatedAt); err != nil {
return err
}
if err := boltutil.WriteLabels(bkt, image.Labels); err != nil {
return errors.Wrapf(err, "writing labels for image %v", image.Name)
}
// write the target bucket
tbkt, err := bkt.CreateBucketIfNotExists([]byte(bucketKeyTarget))
if err != nil {
return err
}
sizeEncoded, err := encodeSize(image.Target.Size)
if err != nil {
return err
}
for _, v := range [][2][]byte{
{bucketKeyDigest, []byte(image.Target.Digest)},
{bucketKeyMediaType, []byte(image.Target.MediaType)},
{bucketKeySize, sizeEncoded},
} {
if err := tbkt.Put(v[0], v[1]); err != nil {
return err
}
}
return nil
}
func encodeSize(size int64) ([]byte, error) {
var (
buf [binary.MaxVarintLen64]byte
sizeEncoded []byte = buf[:]
)
sizeEncoded = sizeEncoded[:binary.PutVarint(sizeEncoded, size)]
if len(sizeEncoded) == 0 {
return nil, fmt.Errorf("failed encoding size = %v", size)
}
return sizeEncoded, nil
}