distribution/registry/client/repository.go
Derek McGowan ce614b6de8 Add client implementation of distribution interface
Adds functionality to create a Repository client which connects to a remote endpoint.

Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)
2015-05-15 17:56:27 -07:00

657 lines
14 KiB
Go

package client
import (
"bufio"
"bytes"
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"net/http"
"net/url"
"os"
"strconv"
"time"
ctxu "github.com/docker/distribution/context"
"github.com/docker/distribution/manifest"
"github.com/docker/distribution/digest"
"github.com/docker/distribution"
"github.com/docker/distribution/registry/api/v2"
"golang.org/x/net/context"
)
// NewRepositoryClient creates a new Repository for the given repository name and endpoint
func NewRepositoryClient(ctx context.Context, name string, endpoint *RepositoryEndpoint) (distribution.Repository, error) {
if err := v2.ValidateRespositoryName(name); err != nil {
return nil, err
}
ub, err := endpoint.URLBuilder()
if err != nil {
return nil, err
}
client, err := endpoint.HTTPClient(name)
if err != nil {
return nil, err
}
return &repository{
client: client,
ub: ub,
name: name,
context: ctx,
mirror: endpoint.Mirror,
}, nil
}
type repository struct {
client *http.Client
ub *v2.URLBuilder
context context.Context
name string
mirror bool
}
func (r *repository) Name() string {
return r.name
}
func (r *repository) Layers() distribution.LayerService {
return &layers{
repository: r,
}
}
func (r *repository) Manifests() distribution.ManifestService {
return &manifests{
repository: r,
}
}
func (r *repository) Signatures() distribution.SignatureService {
return &signatures{
repository: r,
}
}
type signatures struct {
*repository
}
func (s *signatures) Get(dgst digest.Digest) ([][]byte, error) {
panic("not implemented")
}
func (s *signatures) Put(dgst digest.Digest, signatures ...[]byte) error {
panic("not implemented")
}
type manifests struct {
*repository
}
func (ms *manifests) Tags() ([]string, error) {
panic("not implemented")
}
func (ms *manifests) Exists(dgst digest.Digest) (bool, error) {
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
}
switch {
case resp.StatusCode == http.StatusOK:
return true, nil
case resp.StatusCode == http.StatusNotFound:
return false, nil
case resp.StatusCode >= 400 && resp.StatusCode < 500:
return false, parseHTTPErrorResponse(resp)
default:
return false, &UnexpectedHTTPStatusError{Status: resp.Status}
}
}
func (ms *manifests) Get(dgst digest.Digest) (*manifest.SignedManifest, error) {
return ms.GetByTag(dgst.String())
}
func (ms *manifests) GetByTag(tag string) (*manifest.SignedManifest, error) {
u, err := ms.ub.BuildManifestURL(ms.name, tag)
if err != nil {
return nil, err
}
resp, err := ms.client.Get(u)
if err != nil {
return nil, err
}
defer resp.Body.Close()
switch {
case resp.StatusCode == http.StatusOK:
var sm manifest.SignedManifest
decoder := json.NewDecoder(resp.Body)
if err := decoder.Decode(&sm); err != nil {
return nil, err
}
return &sm, nil
case resp.StatusCode >= 400 && resp.StatusCode < 500:
return nil, parseHTTPErrorResponse(resp)
default:
return nil, &UnexpectedHTTPStatusError{Status: resp.Status}
}
}
func (ms *manifests) Put(m *manifest.SignedManifest) error {
manifestURL, err := ms.ub.BuildManifestURL(ms.name, m.Tag)
if err != nil {
return err
}
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()
switch {
case resp.StatusCode == http.StatusAccepted:
// TODO(dmcgowan): Use or check digest header
return nil
case resp.StatusCode >= 400 && resp.StatusCode < 500:
return parseHTTPErrorResponse(resp)
default:
return &UnexpectedHTTPStatusError{Status: resp.Status}
}
}
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()
switch {
case resp.StatusCode == http.StatusOK:
return nil
case resp.StatusCode >= 400 && resp.StatusCode < 500:
return parseHTTPErrorResponse(resp)
default:
return &UnexpectedHTTPStatusError{Status: resp.Status}
}
}
type layers struct {
*repository
}
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 (ls *layers) Exists(dgst digest.Digest) (bool, error) {
_, err := ls.fetchLayer(dgst)
if err != nil {
switch err := err.(type) {
case distribution.ErrUnknownLayer:
return false, nil
default:
return false, err
}
}
return true, nil
}
func (ls *layers) Fetch(dgst digest.Digest) (distribution.Layer, error) {
return ls.fetchLayer(dgst)
}
func (ls *layers) Upload() (distribution.LayerUpload, error) {
u, err := ls.ub.BuildBlobUploadURL(ls.name)
resp, err := ls.client.Post(u, "", nil)
if err != nil {
return nil, err
}
defer resp.Body.Close()
switch {
case resp.StatusCode == http.StatusAccepted:
// 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 &httpLayerUpload{
layers: ls,
uuid: uuid,
startedAt: time.Now(),
location: location,
}, nil
case resp.StatusCode >= 400 && resp.StatusCode < 500:
return nil, parseHTTPErrorResponse(resp)
default:
return nil, &UnexpectedHTTPStatusError{Status: resp.Status}
}
}
func (ls *layers) Resume(uuid string) (distribution.LayerUpload, error) {
panic("not implemented")
}
func (ls *layers) fetchLayer(dgst digest.Digest) (distribution.Layer, error) {
u, err := ls.ub.BuildBlobURL(ls.name, dgst)
if err != nil {
return nil, err
}
resp, err := ls.client.Head(u)
if err != nil {
return nil, err
}
defer resp.Body.Close()
switch {
case resp.StatusCode == http.StatusOK:
lengthHeader := resp.Header.Get("Content-Length")
length, err := strconv.ParseInt(lengthHeader, 10, 64)
if err != nil {
return nil, fmt.Errorf("error parsing content-length: %v", err)
}
var t time.Time
lastModified := resp.Header.Get("Last-Modified")
if lastModified != "" {
t, err = http.ParseTime(lastModified)
if err != nil {
return nil, fmt.Errorf("error parsing last-modified: %v", err)
}
}
return &httpLayer{
layers: ls,
size: length,
digest: dgst,
createdAt: t,
}, nil
case resp.StatusCode == http.StatusNotFound:
return nil, distribution.ErrUnknownLayer{
FSLayer: manifest.FSLayer{
BlobSum: dgst,
},
}
case resp.StatusCode >= 400 && resp.StatusCode < 500:
return nil, parseHTTPErrorResponse(resp)
default:
return nil, &UnexpectedHTTPStatusError{Status: resp.Status}
}
}
type httpLayer struct {
*layers
size int64
digest digest.Digest
createdAt time.Time
rc io.ReadCloser // remote read closer
brd *bufio.Reader // internal buffered io
offset int64
err error
}
func (hl *httpLayer) CreatedAt() time.Time {
return hl.createdAt
}
func (hl *httpLayer) Digest() digest.Digest {
return hl.digest
}
func (hl *httpLayer) Read(p []byte) (n int, err error) {
if hl.err != nil {
return 0, hl.err
}
rd, err := hl.reader()
if err != nil {
return 0, err
}
n, err = rd.Read(p)
hl.offset += int64(n)
// Simulate io.EOR error if we reach filesize.
if err == nil && hl.offset >= hl.size {
err = io.EOF
}
return n, err
}
func (hl *httpLayer) Seek(offset int64, whence int) (int64, error) {
if hl.err != nil {
return 0, hl.err
}
var err error
newOffset := hl.offset
switch whence {
case os.SEEK_CUR:
newOffset += int64(offset)
case os.SEEK_END:
newOffset = hl.size + int64(offset)
case os.SEEK_SET:
newOffset = int64(offset)
}
if newOffset < 0 {
err = fmt.Errorf("cannot seek to negative position")
} else {
if hl.offset != newOffset {
hl.reset()
}
// No problems, set the offset.
hl.offset = newOffset
}
return hl.offset, err
}
func (hl *httpLayer) Close() error {
if hl.err != nil {
return hl.err
}
// close and release reader chain
if hl.rc != nil {
hl.rc.Close()
}
hl.rc = nil
hl.brd = nil
hl.err = fmt.Errorf("httpLayer: closed")
return nil
}
func (hl *httpLayer) reset() {
if hl.err != nil {
return
}
if hl.rc != nil {
hl.rc.Close()
hl.rc = nil
}
}
func (hl *httpLayer) reader() (io.Reader, error) {
if hl.err != nil {
return nil, hl.err
}
if hl.rc != nil {
return hl.brd, nil
}
// If the offset is great than or equal to size, return a empty, noop reader.
if hl.offset >= hl.size {
return ioutil.NopCloser(bytes.NewReader([]byte{})), nil
}
blobURL, err := hl.ub.BuildBlobURL(hl.name, hl.digest)
if err != nil {
return nil, err
}
req, err := http.NewRequest("GET", blobURL, nil)
if err != nil {
return nil, err
}
if hl.offset > 0 {
// TODO(stevvooe): Get this working correctly.
// If we are at different offset, issue a range request from there.
req.Header.Add("Range", fmt.Sprintf("1-"))
ctxu.GetLogger(hl.context).Infof("Range: %s", req.Header.Get("Range"))
}
resp, err := hl.client.Do(req)
if err != nil {
return nil, err
}
switch {
case resp.StatusCode == 200:
hl.rc = resp.Body
default:
defer resp.Body.Close()
return nil, fmt.Errorf("unexpected status resolving reader: %v", resp.Status)
}
if hl.brd == nil {
hl.brd = bufio.NewReader(hl.rc)
} else {
hl.brd.Reset(hl.rc)
}
return hl.brd, nil
}
func (hl *httpLayer) Length() int64 {
return hl.size
}
func (hl *httpLayer) Handler(r *http.Request) (http.Handler, error) {
panic("Not implemented")
}
type httpLayerUpload struct {
*layers
uuid string
startedAt time.Time
location string // always the last value of the location header.
offset int64
closed bool
}
var _ distribution.LayerUpload = &httpLayerUpload{}
func (hlu *httpLayerUpload) ReadFrom(r io.Reader) (n int64, err error) {
req, err := http.NewRequest("PATCH", hlu.location, r)
if err != nil {
return 0, err
}
defer req.Body.Close()
resp, err := hlu.client.Do(req)
if err != nil {
return 0, err
}
switch {
case resp.StatusCode == http.StatusAccepted:
// TODO(dmcgowan): Validate headers
hlu.uuid = resp.Header.Get("Docker-Upload-UUID")
hlu.location, err = sanitizeLocation(resp.Header.Get("Location"), hlu.location)
if err != nil {
return 0, err
}
rng := resp.Header.Get("Range")
var start, end int64
if n, err := fmt.Sscanf(rng, "%d-%d", &start, &end); err != nil {
return 0, err
} else if n != 2 || end < start {
return 0, fmt.Errorf("bad range format: %s", rng)
}
return (end - start + 1), nil
case resp.StatusCode == http.StatusNotFound:
return 0, &BlobUploadNotFoundError{Location: hlu.location}
case resp.StatusCode >= 400 && resp.StatusCode < 500:
return 0, parseHTTPErrorResponse(resp)
default:
return 0, &UnexpectedHTTPStatusError{Status: resp.Status}
}
}
func (hlu *httpLayerUpload) Write(p []byte) (n int, err error) {
req, err := http.NewRequest("PATCH", hlu.location, bytes.NewReader(p))
if err != nil {
return 0, err
}
req.Header.Set("Content-Range", fmt.Sprintf("%d-%d", hlu.offset, hlu.offset+int64(len(p)-1)))
req.Header.Set("Content-Length", fmt.Sprintf("%d", len(p)))
req.Header.Set("Content-Type", "application/octet-stream")
resp, err := hlu.client.Do(req)
if err != nil {
return 0, err
}
switch {
case resp.StatusCode == http.StatusAccepted:
// TODO(dmcgowan): Validate headers
hlu.uuid = resp.Header.Get("Docker-Upload-UUID")
hlu.location, err = sanitizeLocation(resp.Header.Get("Location"), hlu.location)
if err != nil {
return 0, err
}
rng := resp.Header.Get("Range")
var start, end int
if n, err := fmt.Sscanf(rng, "%d-%d", &start, &end); err != nil {
return 0, err
} else if n != 2 || end < start {
return 0, fmt.Errorf("bad range format: %s", rng)
}
return (end - start + 1), nil
case resp.StatusCode == http.StatusNotFound:
return 0, &BlobUploadNotFoundError{Location: hlu.location}
case resp.StatusCode >= 400 && resp.StatusCode < 500:
return 0, parseHTTPErrorResponse(resp)
default:
return 0, &UnexpectedHTTPStatusError{Status: resp.Status}
}
}
func (hlu *httpLayerUpload) Seek(offset int64, whence int) (int64, error) {
newOffset := hlu.offset
switch whence {
case os.SEEK_CUR:
newOffset += int64(offset)
case os.SEEK_END:
return newOffset, errors.New("Cannot seek from end on incomplete upload")
case os.SEEK_SET:
newOffset = int64(offset)
}
hlu.offset = newOffset
return hlu.offset, nil
}
func (hlu *httpLayerUpload) UUID() string {
return hlu.uuid
}
func (hlu *httpLayerUpload) StartedAt() time.Time {
return hlu.startedAt
}
func (hlu *httpLayerUpload) Finish(digest digest.Digest) (distribution.Layer, error) {
// TODO(dmcgowan): Check if already finished, if so just fetch
req, err := http.NewRequest("PUT", hlu.location, nil)
if err != nil {
return nil, err
}
values := req.URL.Query()
values.Set("digest", digest.String())
req.URL.RawQuery = values.Encode()
resp, err := hlu.client.Do(req)
if err != nil {
return nil, err
}
switch {
case resp.StatusCode == http.StatusCreated:
return hlu.Layers().Fetch(digest)
case resp.StatusCode == http.StatusNotFound:
return nil, &BlobUploadNotFoundError{Location: hlu.location}
case resp.StatusCode >= 400 && resp.StatusCode < 500:
return nil, parseHTTPErrorResponse(resp)
default:
return nil, &UnexpectedHTTPStatusError{Status: resp.Status}
}
}
func (hlu *httpLayerUpload) Cancel() error {
panic("not implemented")
}
func (hlu *httpLayerUpload) Close() error {
hlu.closed = true
return nil
}