forked from TrueCloudLab/distribution
538 lines
12 KiB
Go
538 lines
12 KiB
Go
package client
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"io"
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"io/ioutil"
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"net/http"
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"net/url"
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"strconv"
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"time"
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"github.com/docker/distribution"
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"github.com/docker/distribution/context"
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"github.com/docker/distribution/digest"
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"github.com/docker/distribution/manifest"
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"github.com/docker/distribution/registry/api/v2"
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"github.com/docker/distribution/registry/client/transport"
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"github.com/docker/distribution/registry/storage/cache"
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"github.com/docker/distribution/registry/storage/cache/memory"
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)
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// Registry provides an interface for calling Repositories, which returns a catalog of repositories.
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type Registry interface {
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Repositories(ctx context.Context, repos []string, last string) (n int, err error)
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}
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// NewRegistry creates a registry namespace which can be used to get a listing of repositories
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func NewRegistry(ctx context.Context, baseURL string, transport http.RoundTripper) (Registry, error) {
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ub, err := v2.NewURLBuilderFromString(baseURL)
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if err != nil {
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return nil, err
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}
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client := &http.Client{
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Transport: transport,
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Timeout: 1 * time.Minute,
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}
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return ®istry{
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client: client,
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ub: ub,
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context: ctx,
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}, nil
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}
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type registry struct {
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client *http.Client
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ub *v2.URLBuilder
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context context.Context
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}
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// Repositories returns a lexigraphically sorted catalog given a base URL. The 'entries' slice will be filled up to the size
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// of the slice, starting at the value provided in 'last'. The number of entries will be returned along with io.EOF if there
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// are no more entries
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func (r *registry) Repositories(ctx context.Context, entries []string, last string) (int, error) {
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var numFilled int
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var returnErr error
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values := buildCatalogValues(len(entries), last)
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u, err := r.ub.BuildCatalogURL(values)
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if err != nil {
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return 0, err
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}
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resp, err := r.client.Get(u)
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if err != nil {
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return 0, err
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}
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defer resp.Body.Close()
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switch resp.StatusCode {
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case http.StatusOK:
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var ctlg struct {
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Repositories []string `json:"repositories"`
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}
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decoder := json.NewDecoder(resp.Body)
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if err := decoder.Decode(&ctlg); err != nil {
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return 0, err
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}
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for cnt := range ctlg.Repositories {
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entries[cnt] = ctlg.Repositories[cnt]
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}
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numFilled = len(ctlg.Repositories)
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link := resp.Header.Get("Link")
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if link == "" {
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returnErr = io.EOF
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}
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default:
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return 0, handleErrorResponse(resp)
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}
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return numFilled, returnErr
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}
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// NewRepository creates a new Repository for the given repository name and base URL
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func NewRepository(ctx context.Context, name, baseURL string, transport http.RoundTripper) (distribution.Repository, error) {
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if err := v2.ValidateRepositoryName(name); err != nil {
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return nil, err
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}
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ub, err := v2.NewURLBuilderFromString(baseURL)
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if err != nil {
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return nil, err
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}
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client := &http.Client{
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Transport: transport,
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// TODO(dmcgowan): create cookie jar
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}
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return &repository{
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client: client,
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ub: ub,
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name: name,
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context: ctx,
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}, nil
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}
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type repository struct {
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client *http.Client
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ub *v2.URLBuilder
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context context.Context
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name string
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}
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func (r *repository) Name() string {
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return r.name
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}
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func (r *repository) Blobs(ctx context.Context) distribution.BlobStore {
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statter := &blobStatter{
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name: r.Name(),
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ub: r.ub,
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client: r.client,
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}
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return &blobs{
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name: r.Name(),
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ub: r.ub,
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client: r.client,
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statter: cache.NewCachedBlobStatter(memory.NewInMemoryBlobDescriptorCacheProvider(), statter),
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}
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}
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func (r *repository) Manifests(ctx context.Context, options ...distribution.ManifestServiceOption) (distribution.ManifestService, error) {
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// todo(richardscothern): options should be sent over the wire
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return &manifests{
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name: r.Name(),
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ub: r.ub,
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client: r.client,
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etags: make(map[string]string),
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}, nil
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}
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func (r *repository) Signatures() distribution.SignatureService {
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ms, _ := r.Manifests(r.context)
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return &signatures{
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manifests: ms,
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}
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}
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type signatures struct {
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manifests distribution.ManifestService
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}
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func (s *signatures) Get(dgst digest.Digest) ([][]byte, error) {
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m, err := s.manifests.Get(dgst)
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if err != nil {
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return nil, err
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}
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return m.Signatures()
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}
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func (s *signatures) Put(dgst digest.Digest, signatures ...[]byte) error {
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panic("not implemented")
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}
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type manifests struct {
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name string
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ub *v2.URLBuilder
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client *http.Client
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etags map[string]string
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}
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func (ms *manifests) Tags() ([]string, error) {
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u, err := ms.ub.BuildTagsURL(ms.name)
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if err != nil {
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return nil, err
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}
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resp, err := ms.client.Get(u)
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if err != nil {
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return nil, err
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}
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defer resp.Body.Close()
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switch resp.StatusCode {
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case http.StatusOK:
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b, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return nil, err
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}
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tagsResponse := struct {
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Tags []string `json:"tags"`
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}{}
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if err := json.Unmarshal(b, &tagsResponse); err != nil {
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return nil, err
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}
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return tagsResponse.Tags, nil
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case http.StatusNotFound:
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return nil, nil
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default:
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return nil, handleErrorResponse(resp)
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}
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}
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func (ms *manifests) Exists(dgst digest.Digest) (bool, error) {
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// Call by Tag endpoint since the API uses the same
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// URL endpoint for tags and digests.
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return ms.ExistsByTag(dgst.String())
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}
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func (ms *manifests) ExistsByTag(tag string) (bool, error) {
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u, err := ms.ub.BuildManifestURL(ms.name, tag)
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if err != nil {
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return false, err
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}
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resp, err := ms.client.Head(u)
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if err != nil {
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return false, err
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}
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switch resp.StatusCode {
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case http.StatusOK:
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return true, nil
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case http.StatusNotFound:
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return false, nil
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default:
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return false, handleErrorResponse(resp)
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}
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}
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func (ms *manifests) Get(dgst digest.Digest) (*manifest.SignedManifest, error) {
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// Call by Tag endpoint since the API uses the same
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// URL endpoint for tags and digests.
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return ms.GetByTag(dgst.String())
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}
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// AddEtagToTag allows a client to supply an eTag to GetByTag which will be
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// used for a conditional HTTP request. If the eTag matches, a nil manifest
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// and nil error will be returned. etag is automatically quoted when added to
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// this map.
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func AddEtagToTag(tag, etag string) distribution.ManifestServiceOption {
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return func(ms distribution.ManifestService) error {
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if ms, ok := ms.(*manifests); ok {
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ms.etags[tag] = fmt.Sprintf(`"%s"`, etag)
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return nil
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}
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return fmt.Errorf("etag options is a client-only option")
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}
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}
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func (ms *manifests) GetByTag(tag string, options ...distribution.ManifestServiceOption) (*manifest.SignedManifest, error) {
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for _, option := range options {
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err := option(ms)
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if err != nil {
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return nil, err
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}
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}
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u, err := ms.ub.BuildManifestURL(ms.name, tag)
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if err != nil {
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return nil, err
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}
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req, err := http.NewRequest("GET", u, nil)
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if err != nil {
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return nil, err
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}
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if _, ok := ms.etags[tag]; ok {
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req.Header.Set("eTag", ms.etags[tag])
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}
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resp, err := ms.client.Do(req)
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if err != nil {
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return nil, err
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}
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defer resp.Body.Close()
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switch resp.StatusCode {
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case http.StatusOK:
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var sm manifest.SignedManifest
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decoder := json.NewDecoder(resp.Body)
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if err := decoder.Decode(&sm); err != nil {
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return nil, err
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}
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return &sm, nil
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case http.StatusNotModified:
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return nil, nil
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default:
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return nil, handleErrorResponse(resp)
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}
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}
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func (ms *manifests) Put(m *manifest.SignedManifest) error {
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manifestURL, err := ms.ub.BuildManifestURL(ms.name, m.Tag)
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if err != nil {
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return err
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}
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// todo(richardscothern): do something with options here when they become applicable
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putRequest, err := http.NewRequest("PUT", manifestURL, bytes.NewReader(m.Raw))
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if err != nil {
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return err
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}
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resp, err := ms.client.Do(putRequest)
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if err != nil {
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return err
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}
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defer resp.Body.Close()
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switch resp.StatusCode {
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case http.StatusAccepted:
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// TODO(dmcgowan): make use of digest header
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return nil
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default:
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return handleErrorResponse(resp)
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}
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}
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func (ms *manifests) Delete(dgst digest.Digest) error {
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u, err := ms.ub.BuildManifestURL(ms.name, dgst.String())
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if err != nil {
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return err
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}
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req, err := http.NewRequest("DELETE", u, nil)
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if err != nil {
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return err
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}
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resp, err := ms.client.Do(req)
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if err != nil {
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return err
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}
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defer resp.Body.Close()
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switch resp.StatusCode {
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case http.StatusOK:
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return nil
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default:
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return handleErrorResponse(resp)
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}
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}
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type blobs struct {
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name string
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ub *v2.URLBuilder
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client *http.Client
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statter distribution.BlobStatter
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}
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func sanitizeLocation(location, source string) (string, error) {
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locationURL, err := url.Parse(location)
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if err != nil {
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return "", err
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}
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if locationURL.Scheme == "" {
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sourceURL, err := url.Parse(source)
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if err != nil {
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return "", err
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}
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locationURL = &url.URL{
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Scheme: sourceURL.Scheme,
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Host: sourceURL.Host,
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Path: location,
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}
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location = locationURL.String()
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}
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return location, nil
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}
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func (bs *blobs) Stat(ctx context.Context, dgst digest.Digest) (distribution.Descriptor, error) {
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return bs.statter.Stat(ctx, dgst)
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}
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func (bs *blobs) Get(ctx context.Context, dgst digest.Digest) ([]byte, error) {
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desc, err := bs.Stat(ctx, dgst)
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if err != nil {
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return nil, err
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}
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reader, err := bs.Open(ctx, desc.Digest)
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if err != nil {
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return nil, err
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}
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defer reader.Close()
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return ioutil.ReadAll(reader)
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}
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func (bs *blobs) Open(ctx context.Context, dgst digest.Digest) (distribution.ReadSeekCloser, error) {
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stat, err := bs.statter.Stat(ctx, dgst)
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if err != nil {
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return nil, err
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}
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blobURL, err := bs.ub.BuildBlobURL(bs.name, stat.Digest)
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if err != nil {
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return nil, err
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}
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return transport.NewHTTPReadSeeker(bs.client, blobURL, stat.Size), nil
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}
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func (bs *blobs) ServeBlob(ctx context.Context, w http.ResponseWriter, r *http.Request, dgst digest.Digest) error {
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panic("not implemented")
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}
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func (bs *blobs) Put(ctx context.Context, mediaType string, p []byte) (distribution.Descriptor, error) {
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writer, err := bs.Create(ctx)
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if err != nil {
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return distribution.Descriptor{}, err
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}
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dgstr := digest.Canonical.New()
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n, err := io.Copy(writer, io.TeeReader(bytes.NewReader(p), dgstr.Hash()))
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if err != nil {
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return distribution.Descriptor{}, err
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}
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if n < int64(len(p)) {
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return distribution.Descriptor{}, fmt.Errorf("short copy: wrote %d of %d", n, len(p))
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}
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desc := distribution.Descriptor{
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MediaType: mediaType,
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Size: int64(len(p)),
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Digest: dgstr.Digest(),
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}
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return writer.Commit(ctx, desc)
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}
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func (bs *blobs) Create(ctx context.Context) (distribution.BlobWriter, error) {
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u, err := bs.ub.BuildBlobUploadURL(bs.name)
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resp, err := bs.client.Post(u, "", nil)
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if err != nil {
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return nil, err
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}
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defer resp.Body.Close()
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switch resp.StatusCode {
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case http.StatusAccepted:
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// TODO(dmcgowan): Check for invalid UUID
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uuid := resp.Header.Get("Docker-Upload-UUID")
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location, err := sanitizeLocation(resp.Header.Get("Location"), u)
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if err != nil {
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return nil, err
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}
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return &httpBlobUpload{
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statter: bs.statter,
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client: bs.client,
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uuid: uuid,
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startedAt: time.Now(),
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location: location,
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}, nil
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default:
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return nil, handleErrorResponse(resp)
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}
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}
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func (bs *blobs) Resume(ctx context.Context, id string) (distribution.BlobWriter, error) {
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panic("not implemented")
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}
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type blobStatter struct {
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name string
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ub *v2.URLBuilder
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client *http.Client
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}
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func (bs *blobStatter) Stat(ctx context.Context, dgst digest.Digest) (distribution.Descriptor, error) {
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u, err := bs.ub.BuildBlobURL(bs.name, dgst)
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if err != nil {
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return distribution.Descriptor{}, err
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}
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resp, err := bs.client.Head(u)
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if err != nil {
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return distribution.Descriptor{}, err
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}
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defer resp.Body.Close()
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switch resp.StatusCode {
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case http.StatusOK:
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lengthHeader := resp.Header.Get("Content-Length")
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length, err := strconv.ParseInt(lengthHeader, 10, 64)
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if err != nil {
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return distribution.Descriptor{}, fmt.Errorf("error parsing content-length: %v", err)
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}
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return distribution.Descriptor{
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MediaType: resp.Header.Get("Content-Type"),
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Size: length,
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Digest: dgst,
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}, nil
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case http.StatusNotFound:
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return distribution.Descriptor{}, distribution.ErrBlobUnknown
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default:
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return distribution.Descriptor{}, handleErrorResponse(resp)
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}
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}
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func buildCatalogValues(maxEntries int, last string) url.Values {
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values := url.Values{}
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if maxEntries > 0 {
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values.Add("n", strconv.Itoa(maxEntries))
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}
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if last != "" {
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values.Add("last", last)
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}
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return values
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}
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