DockerCLI/cli/registry/client/client.go

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package client
import (
"context"
"fmt"
"net/http"
"strings"
manifesttypes "github.com/docker/cli/cli/manifest/types"
"github.com/docker/distribution"
"github.com/docker/distribution/reference"
distributionclient "github.com/docker/distribution/registry/client"
"github.com/docker/docker/api/types"
registrytypes "github.com/docker/docker/api/types/registry"
"github.com/opencontainers/go-digest"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
// RegistryClient is a client used to communicate with a Docker distribution
// registry
type RegistryClient interface {
GetManifest(ctx context.Context, ref reference.Named) (manifesttypes.ImageManifest, error)
GetManifestList(ctx context.Context, ref reference.Named) ([]manifesttypes.ImageManifest, error)
MountBlob(ctx context.Context, source reference.Canonical, target reference.Named) error
PutManifest(ctx context.Context, ref reference.Named, manifest distribution.Manifest) (digest.Digest, error)
}
// NewRegistryClient returns a new RegistryClient with a resolver
func NewRegistryClient(resolver AuthConfigResolver, userAgent string, insecure bool) RegistryClient {
return &client{
authConfigResolver: resolver,
insecureRegistry: insecure,
userAgent: userAgent,
}
}
// AuthConfigResolver returns Auth Configuration for an index
type AuthConfigResolver func(ctx context.Context, index *registrytypes.IndexInfo) types.AuthConfig
// PutManifestOptions is the data sent to push a manifest
type PutManifestOptions struct {
MediaType string
Payload []byte
}
type client struct {
authConfigResolver AuthConfigResolver
insecureRegistry bool
userAgent string
}
// ErrBlobCreated returned when a blob mount request was created
type ErrBlobCreated struct {
From reference.Named
Target reference.Named
}
func (err ErrBlobCreated) Error() string {
return fmt.Sprintf("blob mounted from: %v to: %v",
err.From, err.Target)
}
// ErrHTTPProto returned if attempting to use TLS with a non-TLS registry
type ErrHTTPProto struct {
OrigErr string
}
func (err ErrHTTPProto) Error() string {
return err.OrigErr
}
var _ RegistryClient = &client{}
// MountBlob into the registry, so it can be referenced by a manifest
func (c *client) MountBlob(ctx context.Context, sourceRef reference.Canonical, targetRef reference.Named) error {
repoEndpoint, err := newDefaultRepositoryEndpoint(targetRef, c.insecureRegistry)
if err != nil {
return err
}
repo, err := c.getRepositoryForReference(ctx, targetRef, repoEndpoint)
if err != nil {
return err
}
lu, err := repo.Blobs(ctx).Create(ctx, distributionclient.WithMountFrom(sourceRef))
switch err.(type) {
case distribution.ErrBlobMounted:
logrus.Debugf("mount of blob %s succeeded", sourceRef)
return nil
case nil:
default:
return errors.Wrapf(err, "failed to mount blob %s to %s", sourceRef, targetRef)
}
lu.Cancel(ctx)
logrus.Debugf("mount of blob %s created", sourceRef)
return ErrBlobCreated{From: sourceRef, Target: targetRef}
}
// PutManifest sends the manifest to a registry and returns the new digest
func (c *client) PutManifest(ctx context.Context, ref reference.Named, manifest distribution.Manifest) (digest.Digest, error) {
repoEndpoint, err := newDefaultRepositoryEndpoint(ref, c.insecureRegistry)
if err != nil {
return digest.Digest(""), err
}
repo, err := c.getRepositoryForReference(ctx, ref, repoEndpoint)
if err != nil {
return digest.Digest(""), err
}
manifestService, err := repo.Manifests(ctx)
if err != nil {
return digest.Digest(""), err
}
_, opts, err := getManifestOptionsFromReference(ref)
if err != nil {
return digest.Digest(""), err
}
dgst, err := manifestService.Put(ctx, manifest, opts...)
return dgst, errors.Wrapf(err, "failed to put manifest %s", ref)
}
func (c *client) getRepositoryForReference(ctx context.Context, ref reference.Named, repoEndpoint repositoryEndpoint) (distribution.Repository, error) {
httpTransport, err := c.getHTTPTransportForRepoEndpoint(ctx, repoEndpoint)
if err != nil {
if strings.Contains(err.Error(), "server gave HTTP response to HTTPS client") {
return nil, ErrHTTPProto{OrigErr: err.Error()}
}
}
repoName, err := reference.WithName(repoEndpoint.Name())
if err != nil {
return nil, errors.Wrapf(err, "failed to parse repo name from %s", ref)
}
return distributionclient.NewRepository(ctx, repoName, repoEndpoint.BaseURL(), httpTransport)
}
func (c *client) getHTTPTransportForRepoEndpoint(ctx context.Context, repoEndpoint repositoryEndpoint) (http.RoundTripper, error) {
httpTransport, err := getHTTPTransport(
c.authConfigResolver(ctx, repoEndpoint.info.Index),
repoEndpoint.endpoint,
repoEndpoint.Name(),
c.userAgent)
return httpTransport, errors.Wrap(err, "failed to configure transport")
}
// GetManifest returns an ImageManifest for the reference
func (c *client) GetManifest(ctx context.Context, ref reference.Named) (manifesttypes.ImageManifest, error) {
var result manifesttypes.ImageManifest
fetch := func(ctx context.Context, repo distribution.Repository, ref reference.Named) (bool, error) {
var err error
result, err = fetchManifest(ctx, repo, ref)
return result.Ref != nil, err
}
err := c.iterateEndpoints(ctx, ref, fetch)
return result, err
}
// GetManifestList returns a list of ImageManifest for the reference
func (c *client) GetManifestList(ctx context.Context, ref reference.Named) ([]manifesttypes.ImageManifest, error) {
result := []manifesttypes.ImageManifest{}
fetch := func(ctx context.Context, repo distribution.Repository, ref reference.Named) (bool, error) {
var err error
result, err = fetchList(ctx, repo, ref)
return len(result) > 0, err
}
err := c.iterateEndpoints(ctx, ref, fetch)
return result, err
}
func getManifestOptionsFromReference(ref reference.Named) (digest.Digest, []distribution.ManifestServiceOption, error) {
if tagged, isTagged := ref.(reference.NamedTagged); isTagged {
tag := tagged.Tag()
return "", []distribution.ManifestServiceOption{distribution.WithTag(tag)}, nil
}
if digested, isDigested := ref.(reference.Canonical); isDigested {
return digested.Digest(), []distribution.ManifestServiceOption{}, nil
}
return "", nil, errors.Errorf("%s no tag or digest", ref)
}