Store container metadata in boltdb buckets
Signed-off-by: Derek McGowan <derek@mcgstyle.net>
This commit is contained in:
Derek McGowan
parent
e1ed4a2ea4
commit
f98a4f10df
@ -2,7 +2,6 @@ package containers
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import (
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"context"
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"encoding/json"
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"github.com/boltdb/bolt"
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"github.com/pkg/errors"
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@ -25,6 +24,11 @@ func IsExists(err error) bool {
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var (
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bucketKeyStorageVersion = []byte("v1")
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bucketKeyContainers = []byte("containers")
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bucketKeyLabels = []byte("labels")
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bucketKeyImage = []byte("image")
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bucketKeyRuntime = []byte("runtime")
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bucketKeySpec = []byte("spec")
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bucketKeyRootFS = []byte("rootfs")
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)
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type storage struct {
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@ -38,19 +42,14 @@ func NewStore(tx *bolt.Tx) Store {
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}
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func (s *storage) Get(ctx context.Context, id string) (Container, error) {
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bkt := s.bucket()
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bkt := getContainerBucket(s.tx, id)
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if bkt == nil {
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return Container{}, errors.Wrap(ErrNotFound, "bucket does not exist")
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}
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cb := bkt.Get([]byte(id))
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if len(cb) == 0 {
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return Container{}, errors.Wrap(ErrNotFound, "no content for id")
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}
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var container Container
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if err := json.Unmarshal(cb, &container); err != nil {
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return Container{}, errors.Wrap(err, "failed to unmarshal container")
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container := Container{ID: id}
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if err := readContainer(&container, bkt); err != nil {
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return Container{}, errors.Wrap(err, "failed to read container")
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}
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return container, nil
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@ -58,14 +57,19 @@ func (s *storage) Get(ctx context.Context, id string) (Container, error) {
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func (s *storage) List(ctx context.Context, filter string) ([]Container, error) {
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containers := []Container{}
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bkt := s.bucket()
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bkt := getContainersBucket(s.tx)
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if bkt == nil {
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return containers, nil
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}
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err := bkt.ForEach(func(k, v []byte) error {
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cbkt := bkt.Bucket(k)
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if cbkt == nil {
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return nil
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}
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container := Container{ID: string(k)}
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if err := json.Unmarshal(v, &container); err != nil {
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return errors.Wrap(err, "failed to unmarshal container")
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if err := readContainer(&container, cbkt); err != nil {
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return errors.Wrap(err, "failed to read container")
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}
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containers = append(containers, container)
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return nil
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@ -78,69 +82,140 @@ func (s *storage) List(ctx context.Context, filter string) ([]Container, error)
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}
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func (s *storage) Create(ctx context.Context, container Container) (Container, error) {
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bkt, err := s.createBucket()
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bkt, err := createContainersBucket(s.tx)
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if err != nil {
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return Container{}, err
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}
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b := bkt.Get([]byte(container.ID))
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if len(b) > 0 {
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return Container{}, errors.Wrap(ErrExists, "content for id already exists")
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}
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b, err = json.Marshal(container)
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cbkt, err := bkt.CreateBucket([]byte(container.ID))
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if err != nil {
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if err == bolt.ErrBucketExists {
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err = errors.Wrap(ErrExists, "content for id already exists")
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}
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return Container{}, err
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}
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return container, bkt.Put([]byte(container.ID), b)
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if err := writeContainer(&container, cbkt); err != nil {
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return Container{}, errors.Wrap(err, "failed to write container")
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}
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return container, nil
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}
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func (s *storage) Update(ctx context.Context, container Container) (Container, error) {
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bkt, err := s.createBucket()
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if err != nil {
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return Container{}, err
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bkt := getContainersBucket(s.tx)
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if bkt == nil {
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return Container{}, errors.Wrap(ErrNotFound, "no containers")
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}
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b := bkt.Get([]byte(container.ID))
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if len(b) == 0 {
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cbkt := bkt.Bucket([]byte(container.ID))
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if cbkt == nil {
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return Container{}, errors.Wrap(ErrNotFound, "no content for id")
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}
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b, err = json.Marshal(container)
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if err != nil {
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return Container{}, err
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if err := writeContainer(&container, cbkt); err != nil {
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return Container{}, errors.Wrap(err, "failed to write container")
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}
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return container, bkt.Put([]byte(container.ID), b)
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return container, nil
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}
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func (s *storage) Delete(ctx context.Context, id string) error {
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bkt, err := s.createBucket()
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if err != nil {
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bkt := getContainersBucket(s.tx)
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if bkt == nil {
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return errors.Wrap(ErrNotFound, "no containers")
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}
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err := bkt.DeleteBucket([]byte(id))
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if err == bolt.ErrBucketNotFound {
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return errors.Wrap(ErrNotFound, "no content for id")
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}
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return err
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}
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b := bkt.Get([]byte(id))
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if len(b) == 0 {
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return errors.Wrap(ErrNotFound, "no content for id")
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}
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return bkt.Delete([]byte(id))
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}
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func (s *storage) bucket() *bolt.Bucket {
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bkt := s.tx.Bucket(bucketKeyStorageVersion)
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if bkt == nil {
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func readContainer(container *Container, bkt *bolt.Bucket) error {
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return bkt.ForEach(func(k, v []byte) error {
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switch string(k) {
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case string(bucketKeyImage):
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container.Image = string(v)
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case string(bucketKeyRuntime):
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container.Runtime = string(v)
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case string(bucketKeySpec):
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container.Spec = v
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case string(bucketKeyRootFS):
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container.RootFS = string(v)
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case string(bucketKeyLabels):
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lbkt := bkt.Bucket(bucketKeyLabels)
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if lbkt == nil {
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return nil
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}
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return bkt.Bucket(bucketKeyContainers)
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container.Labels = map[string]string{}
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if err := lbkt.ForEach(func(k, v []byte) error {
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container.Labels[string(k)] = string(v)
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return nil
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}); err != nil {
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return err
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}
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}
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func (s *storage) createBucket() (*bolt.Bucket, error) {
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bkt, err := s.tx.CreateBucketIfNotExists(bucketKeyStorageVersion)
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return nil
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})
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}
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func writeContainer(container *Container, bkt *bolt.Bucket) error {
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for _, v := range [][2][]byte{
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{bucketKeyImage, []byte(container.Image)},
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{bucketKeyRuntime, []byte(container.Runtime)},
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{bucketKeySpec, container.Spec},
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{bucketKeyRootFS, []byte(container.RootFS)},
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} {
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if err := bkt.Put(v[0], v[1]); err != nil {
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return err
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}
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}
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// Remove existing labels to keep from merging
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if lbkt := bkt.Bucket(bucketKeyLabels); lbkt != nil {
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if err := bkt.DeleteBucket(bucketKeyLabels); err != nil {
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return err
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}
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}
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lbkt, err := bkt.CreateBucket(bucketKeyLabels)
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if err != nil {
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return err
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}
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for k, v := range container.Labels {
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if err := lbkt.Put([]byte(k), []byte(v)); err != nil {
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return err
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}
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}
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return nil
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}
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func createContainersBucket(tx *bolt.Tx) (*bolt.Bucket, error) {
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bkt, err := tx.CreateBucketIfNotExists(bucketKeyStorageVersion)
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if err != nil {
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return nil, err
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}
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return bkt.CreateBucketIfNotExists(bucketKeyContainers)
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}
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func getContainersBucket(tx *bolt.Tx) *bolt.Bucket {
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return getBucket(tx, bucketKeyStorageVersion, bucketKeyContainers)
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}
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func getContainerBucket(tx *bolt.Tx, id string) *bolt.Bucket {
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return getBucket(tx, bucketKeyStorageVersion, bucketKeyContainers, []byte(id))
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}
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func getBucket(tx *bolt.Tx, keys ...[]byte) *bolt.Bucket {
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bkt := tx.Bucket(keys[0])
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for _, key := range keys[1:] {
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if bkt == nil {
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break
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}
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bkt = bkt.Bucket(key)
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}
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return bkt
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}
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