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