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containers.go
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containers.go
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package metadata
import (
"context"
"strings"
"time"
"github.com/boltdb/bolt"
"github.com/containerd/containerd/containers"
"github.com/containerd/containerd/errdefs"
"github.com/containerd/containerd/filters"
"github.com/containerd/containerd/identifiers"
"github.com/containerd/containerd/namespaces"
"github.com/gogo/protobuf/proto"
"github.com/gogo/protobuf/types"
"github.com/pkg/errors"
)
type containerStore struct {
tx *bolt.Tx
}
func NewContainerStore(tx *bolt.Tx) containers.Store {
return &containerStore{
tx: tx,
}
}
func (s *containerStore) Get(ctx context.Context, id string) (containers.Container, error) {
namespace, err := namespaces.NamespaceRequired(ctx)
if err != nil {
return containers.Container{}, err
}
bkt := getContainerBucket(s.tx, namespace, id)
if bkt == nil {
return containers.Container{}, errors.Wrapf(errdefs.ErrNotFound, "bucket name %q:%q", namespace, id)
}
container := containers.Container{ID: id}
if err := readContainer(&container, bkt); err != nil {
return containers.Container{}, errors.Wrapf(err, "failed to read container %v", id)
}
return container, nil
}
func (s *containerStore) List(ctx context.Context, fs ...string) ([]containers.Container, 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 := getContainersBucket(s.tx, namespace)
if bkt == nil {
return nil, nil
}
var m []containers.Container
if err := bkt.ForEach(func(k, v []byte) error {
cbkt := bkt.Bucket(k)
if cbkt == nil {
return nil
}
container := containers.Container{ID: string(k)}
if err := readContainer(&container, cbkt); err != nil {
return errors.Wrap(err, "failed to read container")
}
if filter.Match(adaptContainer(container)) {
m = append(m, container)
}
return nil
}); err != nil {
return nil, err
}
return m, nil
}
func (s *containerStore) Create(ctx context.Context, container containers.Container) (containers.Container, error) {
namespace, err := namespaces.NamespaceRequired(ctx)
if err != nil {
return containers.Container{}, err
}
if err := identifiers.Validate(container.ID); err != nil {
return containers.Container{}, err
}
bkt, err := createContainersBucket(s.tx, namespace)
if err != nil {
return containers.Container{}, err
}
cbkt, err := bkt.CreateBucket([]byte(container.ID))
if err != nil {
if err == bolt.ErrBucketExists {
err = errors.Wrapf(errdefs.ErrAlreadyExists, "content %q", container.ID)
}
return containers.Container{}, err
}
container.CreatedAt = time.Now().UTC()
container.UpdatedAt = container.CreatedAt
if err := writeContainer(cbkt, &container); err != nil {
return containers.Container{}, errors.Wrap(err, "failed to write container")
}
return container, nil
}
func (s *containerStore) Update(ctx context.Context, container containers.Container, fieldpaths ...string) (containers.Container, error) {
namespace, err := namespaces.NamespaceRequired(ctx)
if err != nil {
return containers.Container{}, err
}
if container.ID == "" {
return containers.Container{}, errors.Wrapf(errdefs.ErrInvalidArgument, "must specify a container id")
}
bkt := getContainersBucket(s.tx, namespace)
if bkt == nil {
return containers.Container{}, errors.Wrapf(errdefs.ErrNotFound, "container %q", container.ID)
}
cbkt := bkt.Bucket([]byte(container.ID))
if cbkt == nil {
return containers.Container{}, errors.Wrapf(errdefs.ErrNotFound, "container %q", container.ID)
}
var updated containers.Container
if err := readContainer(&updated, cbkt); err != nil {
return updated, errors.Wrapf(err, "failed to read container from bucket")
}
createdat := updated.CreatedAt
updated.ID = container.ID
// apply the field mask. If you update this code, you better follow the
// field mask rules in field_mask.proto. If you don't know what this
// is, do not update this code.
if len(fieldpaths) > 0 {
// TODO(stevvooe): Move this logic into the store itself.
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] = container.Labels[key]
continue
}
switch path {
case "labels":
updated.Labels = container.Labels
case "image":
updated.Image = container.Image
case "runtime":
// TODO(stevvooe): Should this actually be allowed?
updated.Runtime = container.Runtime
case "spec":
updated.Spec = container.Spec
case "rootfs":
updated.RootFS = container.RootFS
default:
return containers.Container{}, errors.Wrapf(errdefs.ErrInvalidArgument, "cannot update %q field on %q", path, container.ID)
}
}
} else {
// no field mask present, just replace everything
updated = container
}
updated.CreatedAt = createdat
updated.UpdatedAt = time.Now().UTC()
if err := writeContainer(cbkt, &updated); err != nil {
return containers.Container{}, errors.Wrap(err, "failed to write container")
}
return container, nil
}
func (s *containerStore) Delete(ctx context.Context, id string) error {
namespace, err := namespaces.NamespaceRequired(ctx)
if err != nil {
return err
}
bkt := getContainersBucket(s.tx, namespace)
if bkt == nil {
return errors.Wrapf(errdefs.ErrNotFound, "cannot delete container %v, bucket not present", id)
}
if err := bkt.DeleteBucket([]byte(id)); err == bolt.ErrBucketNotFound {
return errors.Wrapf(errdefs.ErrNotFound, "container %v", id)
}
return err
}
func readContainer(container *containers.Container, bkt *bolt.Bucket) error {
return bkt.ForEach(func(k, v []byte) error {
switch string(k) {
case string(bucketKeyImage):
container.Image = string(v)
case string(bucketKeyRuntime):
rbkt := bkt.Bucket(bucketKeyRuntime)
if rbkt == nil {
return nil // skip runtime. should be an error?
}
n := rbkt.Get(bucketKeyName)
if n != nil {
container.Runtime.Name = string(n)
}
obkt := rbkt.Get(bucketKeyOptions)
if obkt == nil {
return nil
}
var any types.Any
if err := proto.Unmarshal(obkt, &any); err != nil {
return err
}
container.Runtime.Options = &any
case string(bucketKeySpec):
var any types.Any
if err := proto.Unmarshal(v, &any); err != nil {
return err
}
container.Spec = &any
case string(bucketKeyRootFS):
container.RootFS = string(v)
case string(bucketKeyCreatedAt):
if err := container.CreatedAt.UnmarshalBinary(v); err != nil {
return err
}
case string(bucketKeyUpdatedAt):
if err := container.UpdatedAt.UnmarshalBinary(v); err != nil {
return err
}
case string(bucketKeyLabels):
lbkt := bkt.Bucket(bucketKeyLabels)
if lbkt == nil {
return nil
}
container.Labels = map[string]string{}
if err := readLabels(container.Labels, lbkt); err != nil {
return err
}
}
return nil
})
}
func writeContainer(bkt *bolt.Bucket, container *containers.Container) error {
if err := writeTimestamps(bkt, container.CreatedAt, container.UpdatedAt); err != nil {
return err
}
spec, err := container.Spec.Marshal()
if err != nil {
return err
}
for _, v := range [][2][]byte{
{bucketKeyImage, []byte(container.Image)},
{bucketKeySpec, spec},
{bucketKeyRootFS, []byte(container.RootFS)},
} {
if err := bkt.Put(v[0], v[1]); err != nil {
return err
}
}
if rbkt := bkt.Bucket(bucketKeyRuntime); rbkt != nil {
if err := bkt.DeleteBucket(bucketKeyRuntime); err != nil {
return err
}
}
rbkt, err := bkt.CreateBucket(bucketKeyRuntime)
if err != nil {
return err
}
if err := rbkt.Put(bucketKeyName, []byte(container.Runtime.Name)); err != nil {
return err
}
obkt, err := rbkt.CreateBucket(bucketKeyOptions)
if err != nil {
return err
}
if container.Runtime.Options != nil {
data, err := proto.Marshal(container.Runtime.Options)
if err != nil {
return err
}
if err := obkt.Put(bucketKeyOptions, data); err != nil {
return err
}
}
return writeLabels(bkt, container.Labels)
}