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|
package content
import (
"context"
api "github.com/containerd/containerd/api/services/content/v1"
"github.com/containerd/containerd/content"
"github.com/containerd/containerd/services/content/contentserver"
cerrdefs "github.com/containerd/errdefs"
"github.com/moby/buildkit/session"
digest "github.com/opencontainers/go-digest"
ocispecs "github.com/opencontainers/image-spec/specs-go/v1"
"github.com/pkg/errors"
"google.golang.org/grpc"
"google.golang.org/grpc/metadata"
)
// GRPCHeaderID is a gRPC header for store ID
const GRPCHeaderID = "buildkit-attachable-store-id"
type attachableContentStore struct {
stores map[string]content.Store
}
func (cs *attachableContentStore) choose(ctx context.Context) (content.Store, error) {
md, ok := metadata.FromIncomingContext(ctx)
if !ok {
return nil, errors.Wrap(cerrdefs.ErrInvalidArgument, "request lacks metadata")
}
values := md[GRPCHeaderID]
if len(values) == 0 {
return nil, errors.Wrapf(cerrdefs.ErrInvalidArgument, "request lacks metadata %q", GRPCHeaderID)
}
id := values[0]
store, ok := cs.stores[id]
if !ok {
return nil, errors.Wrapf(cerrdefs.ErrNotFound, "unknown store %s", id)
}
return store, nil
}
func (cs *attachableContentStore) Info(ctx context.Context, dgst digest.Digest) (content.Info, error) {
store, err := cs.choose(ctx)
if err != nil {
return content.Info{}, err
}
return store.Info(ctx, dgst)
}
func (cs *attachableContentStore) Update(ctx context.Context, info content.Info, fieldpaths ...string) (content.Info, error) {
store, err := cs.choose(ctx)
if err != nil {
return content.Info{}, err
}
return store.Update(ctx, info, fieldpaths...)
}
func (cs *attachableContentStore) Walk(ctx context.Context, fn content.WalkFunc, fs ...string) error {
store, err := cs.choose(ctx)
if err != nil {
return err
}
return store.Walk(ctx, fn, fs...)
}
func (cs *attachableContentStore) Delete(ctx context.Context, dgst digest.Digest) error {
store, err := cs.choose(ctx)
if err != nil {
return err
}
return store.Delete(ctx, dgst)
}
func (cs *attachableContentStore) ListStatuses(ctx context.Context, fs ...string) ([]content.Status, error) {
store, err := cs.choose(ctx)
if err != nil {
return nil, err
}
return store.ListStatuses(ctx, fs...)
}
func (cs *attachableContentStore) Status(ctx context.Context, ref string) (content.Status, error) {
store, err := cs.choose(ctx)
if err != nil {
return content.Status{}, err
}
return store.Status(ctx, ref)
}
func (cs *attachableContentStore) Abort(ctx context.Context, ref string) error {
store, err := cs.choose(ctx)
if err != nil {
return err
}
return store.Abort(ctx, ref)
}
func (cs *attachableContentStore) Writer(ctx context.Context, opts ...content.WriterOpt) (content.Writer, error) {
store, err := cs.choose(ctx)
if err != nil {
return nil, err
}
return store.Writer(ctx, opts...)
}
func (cs *attachableContentStore) ReaderAt(ctx context.Context, desc ocispecs.Descriptor) (content.ReaderAt, error) {
store, err := cs.choose(ctx)
if err != nil {
return nil, err
}
return store.ReaderAt(ctx, desc)
}
type attachable struct {
service api.ContentServer
}
// NewAttachable creates session.Attachable from aggregated stores.
// A key of the store map is an ID string that is used for choosing underlying store.
func NewAttachable(stores map[string]content.Store) session.Attachable {
store := &attachableContentStore{stores: stores}
service := contentserver.New(store)
a := attachable{
service: service,
}
return &a
}
func (a *attachable) Register(server *grpc.Server) {
api.RegisterContentServer(server, a.service)
}
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