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client.go
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client.go
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package diff
import (
diffapi "github.com/containerd/containerd/api/services/diff/v1"
"github.com/containerd/containerd/api/types"
"github.com/containerd/containerd/mount"
"github.com/containerd/containerd/rootfs"
ocispec "github.com/opencontainers/image-spec/specs-go/v1"
"golang.org/x/net/context"
)
type DiffService interface {
rootfs.Applier
rootfs.MountDiffer
}
// NewApplierFromClient returns a new Applier which communicates
// over a GRPC connection.
func NewDiffServiceFromClient(client diffapi.DiffClient) DiffService {
return &remote{
client: client,
}
}
type remote struct {
client diffapi.DiffClient
}
func (r *remote) Apply(ctx context.Context, diff ocispec.Descriptor, mounts []mount.Mount) (ocispec.Descriptor, error) {
req := &diffapi.ApplyRequest{
Diff: fromDescriptor(diff),
Mounts: fromMounts(mounts),
}
resp, err := r.client.Apply(ctx, req)
if err != nil {
return ocispec.Descriptor{}, err
}
return toDescriptor(resp.Applied), nil
}
func (r *remote) DiffMounts(ctx context.Context, a, b []mount.Mount, media, ref string) (ocispec.Descriptor, error) {
req := &diffapi.DiffRequest{
Left: fromMounts(a),
Right: fromMounts(b),
MediaType: media,
Ref: ref,
}
resp, err := r.client.Diff(ctx, req)
if err != nil {
return ocispec.Descriptor{}, err
}
return toDescriptor(resp.Diff), nil
}
func toDescriptor(d *types.Descriptor) ocispec.Descriptor {
return ocispec.Descriptor{
MediaType: d.MediaType,
Digest: d.Digest,
Size: d.Size_,
}
}
func fromDescriptor(d ocispec.Descriptor) *types.Descriptor {
return &types.Descriptor{
MediaType: d.MediaType,
Digest: d.Digest,
Size_: d.Size,
}
}
func fromMounts(mounts []mount.Mount) []*types.Mount {
apiMounts := make([]*types.Mount, len(mounts))
for i, m := range mounts {
apiMounts[i] = &types.Mount{
Type: m.Type,
Source: m.Source,
Options: m.Options,
}
}
return apiMounts
}