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namespaces.go
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namespaces.go
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package metadata
import (
"context"
"github.com/boltdb/bolt"
"github.com/containerd/containerd/errdefs"
"github.com/containerd/containerd/namespaces"
"github.com/pkg/errors"
)
type namespaceStore struct {
tx *bolt.Tx
}
func NewNamespaceStore(tx *bolt.Tx) namespaces.Store {
return &namespaceStore{tx: tx}
}
func (s *namespaceStore) Create(ctx context.Context, namespace string, labels map[string]string) error {
topbkt, err := createBucketIfNotExists(s.tx, bucketKeyVersion)
if err != nil {
return err
}
if err := namespaces.Validate(namespace); err != nil {
return err
}
// provides the already exists error.
bkt, err := topbkt.CreateBucket([]byte(namespace))
if err != nil {
if err == bolt.ErrBucketExists {
return errors.Wrapf(errdefs.ErrAlreadyExists, "namespace %q", namespace)
}
return err
}
lbkt, err := bkt.CreateBucketIfNotExists(bucketKeyObjectLabels)
if err != nil {
return err
}
for k, v := range labels {
if err := lbkt.Put([]byte(k), []byte(v)); err != nil {
return err
}
}
return nil
}
func (s *namespaceStore) Labels(ctx context.Context, namespace string) (map[string]string, error) {
labels := map[string]string{}
bkt := getNamespaceLabelsBucket(s.tx, namespace)
if bkt == nil {
return labels, nil
}
if err := bkt.ForEach(func(k, v []byte) error {
labels[string(k)] = string(v)
return nil
}); err != nil {
return nil, err
}
return labels, nil
}
func (s *namespaceStore) SetLabel(ctx context.Context, namespace, key, value string) error {
return withNamespacesLabelsBucket(s.tx, namespace, func(bkt *bolt.Bucket) error {
if value == "" {
return bkt.Delete([]byte(key))
}
return bkt.Put([]byte(key), []byte(value))
})
}
func (s *namespaceStore) List(ctx context.Context) ([]string, error) {
bkt := getBucket(s.tx, bucketKeyVersion)
if bkt == nil {
return nil, nil // no namespaces!
}
var namespaces []string
if err := bkt.ForEach(func(k, v []byte) error {
if v != nil {
return nil // not a bucket
}
namespaces = append(namespaces, string(k))
return nil
}); err != nil {
return nil, err
}
return namespaces, nil
}
func (s *namespaceStore) Delete(ctx context.Context, namespace string) error {
bkt := getBucket(s.tx, bucketKeyVersion)
if empty, err := s.namespaceEmpty(ctx, namespace); err != nil {
return err
} else if !empty {
return errors.Wrapf(errdefs.ErrFailedPrecondition, "namespace %q must be empty", namespace)
}
if err := bkt.DeleteBucket([]byte(namespace)); err != nil {
if err == bolt.ErrBucketNotFound {
return errors.Wrapf(errdefs.ErrNotFound, "namespace %q", namespace)
}
return err
}
return nil
}
func (s *namespaceStore) namespaceEmpty(ctx context.Context, namespace string) (bool, error) {
ctx = namespaces.WithNamespace(ctx, namespace)
// need to check the various object stores.
imageStore := NewImageStore(s.tx)
images, err := imageStore.List(ctx)
if err != nil {
return false, err
}
if len(images) > 0 {
return false, nil
}
containerStore := NewContainerStore(s.tx)
containers, err := containerStore.List(ctx)
if err != nil {
return false, err
}
if len(containers) > 0 {
return false, nil
}
// TODO(stevvooe): Need to add check for content store, as well. Still need
// to make content store namespace aware.
return true, nil
}