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pull.go
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package pull
import (
"context"
"errors"
"fmt"
"io"
"github.com/containerd/containerd/images"
"github.com/containerd/containerd/remotes"
"github.com/deislabs/oras/pkg/content"
ocispec "github.com/opencontainers/image-spec/specs-go/v1"
"github.com/solo-io/wasme/pkg/model"
)
type FilterImpl struct {
code io.ReadCloser
}
func (f *FilterImpl) Code() io.ReadCloser {
return f.code
}
func (f *FilterImpl) Configs() []FilterConfig {
return nil
}
type Puller interface {
Pull(ctx context.Context, image string) (Filter, error)
PullCodeDescriptor(ctx context.Context, ref string) (ocispec.Descriptor, error)
}
type PullerImpl struct {
Resolver remotes.Resolver
}
func NewPuller(resolver remotes.Resolver) *PullerImpl {
return &PullerImpl{
Resolver: resolver,
}
}
func (p *PullerImpl) PullCodeDescriptor(ctx context.Context, ref string) (ocispec.Descriptor, error) {
store := content.NewMemoryStore()
name, desc, err := p.Resolver.Resolve(ctx, ref)
if err != nil {
return ocispec.Descriptor{}, err
}
fetcher, err := p.Resolver.Fetcher(ctx, ref)
if err != nil {
return ocispec.Descriptor{}, err
}
_, err = remotes.FetchHandler(store, fetcher)(ctx, desc)
if err != nil {
return ocispec.Descriptor{}, err
}
children, err := images.ChildrenHandler(store)(ctx, desc)
if err != nil {
return ocispec.Descriptor{}, err
}
fmt.Printf("%+v %+v %+v %+v\n", name, children, desc, err)
for _, child := range children {
if child.MediaType == model.CodeMediaType {
return child, nil
}
}
return ocispec.Descriptor{}, errors.New("code not found")
}
func (p *PullerImpl) Pull(ctx context.Context, ref string) (Filter, error) {
desc, err := p.PullCodeDescriptor(ctx, ref)
if err != nil {
return nil, err
}
return p.Fetch(ctx, ref, desc)
}
func (p *PullerImpl) Fetch(ctx context.Context, ref string, desc ocispec.Descriptor) (Filter, error) {
fetcher, err := p.Resolver.Fetcher(ctx, ref)
if err != nil {
return nil, err
}
rc, err := fetcher.Fetch(ctx, desc)
if err != nil {
return nil, err
}
return &FilterImpl{code: rc}, nil
}