distribution/client/client.go

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package client
import (
"bytes"
"encoding/json"
"fmt"
"io"
"net/http"
"net/url"
"regexp"
"strconv"
"github.com/docker/docker-registry"
)
// Client implements the client interface to the registry http api
type Client interface {
// GetImageManifest returns an image manifest for the image at the given
// name, tag pair
GetImageManifest(name, tag string) (*registry.ImageManifest, error)
// PutImageManifest uploads an image manifest for the image at the given
// name, tag pair
PutImageManifest(name, tag string, imageManifest *registry.ImageManifest) error
// DeleteImage removes the image at the given name, tag pair
DeleteImage(name, tag string) error
// ListImageTags returns a list of all image tags with the given repository
// name
ListImageTags(name string) ([]string, error)
// GetImageLayer returns the image layer at the given name, tarsum pair in
// the form of an io.ReadCloser with the length of this layer
// A nonzero byteOffset can be provided to receive a partial layer beginning
// at the given offset
GetImageLayer(name, tarsum string, byteOffset int) (io.ReadCloser, int, error)
// InitiateLayerUpload starts an image upload for the given name, tarsum
// pair and returns a unique location url to use for other layer upload
// methods
// Returns a *registry.LayerAlreadyExistsError if the layer already exists
// on the registry
InitiateLayerUpload(name, tarsum string) (string, error)
// GetLayerUploadStatus returns the byte offset and length of the layer at
// the given upload location
GetLayerUploadStatus(location string) (int, int, error)
// UploadLayer uploads a full image layer to the registry
UploadLayer(location string, layer io.ReadCloser, length int, checksum *registry.Checksum) error
// UploadLayerChunk uploads a layer chunk with a given length and startByte
// to the registry
// FinishChunkedLayerUpload must be called to finalize this upload
UploadLayerChunk(location string, layerChunk io.ReadCloser, length, startByte int) error
// FinishChunkedLayerUpload completes a chunked layer upload at a given
// location
FinishChunkedLayerUpload(location string, length int, checksum *registry.Checksum) error
// CancelLayerUpload deletes all content at the unfinished layer upload
// location and invalidates any future calls to this layer upload
CancelLayerUpload(location string) error
}
// New returns a new Client which operates against a registry with the
// given base endpoint
// This endpoint should not include /v2/ or any part of the url after this
func New(endpoint string) Client {
return &clientImpl{endpoint}
}
// clientImpl is the default implementation of the Client interface
type clientImpl struct {
Endpoint string
}
// TODO(bbland): use consistent route generation between server and client
func (r *clientImpl) GetImageManifest(name, tag string) (*registry.ImageManifest, error) {
response, err := http.Get(r.imageManifestUrl(name, tag))
if err != nil {
return nil, err
}
defer response.Body.Close()
// TODO(bbland): handle other status codes, like 5xx errors
switch {
case response.StatusCode == http.StatusOK:
break
case response.StatusCode == http.StatusNotFound:
return nil, &registry.ImageManifestNotFoundError{Name: name, Tag: tag}
case response.StatusCode >= 400 && response.StatusCode < 500:
errors := new(registry.Errors)
decoder := json.NewDecoder(response.Body)
err = decoder.Decode(&errors)
if err != nil {
return nil, err
}
return nil, errors
default:
return nil, &registry.UnexpectedHttpStatusError{Status: response.Status}
}
decoder := json.NewDecoder(response.Body)
manifest := new(registry.ImageManifest)
err = decoder.Decode(manifest)
if err != nil {
return nil, err
}
return manifest, nil
}
func (r *clientImpl) PutImageManifest(name, tag string, manifest *registry.ImageManifest) error {
manifestBytes, err := json.Marshal(manifest)
if err != nil {
return err
}
putRequest, err := http.NewRequest("PUT",
r.imageManifestUrl(name, tag), bytes.NewReader(manifestBytes))
if err != nil {
return err
}
response, err := http.DefaultClient.Do(putRequest)
if err != nil {
return err
}
defer response.Body.Close()
// TODO(bbland): handle other status codes, like 5xx errors
switch {
case response.StatusCode == http.StatusOK:
return nil
case response.StatusCode >= 400 && response.StatusCode < 500:
errors := new(registry.Errors)
decoder := json.NewDecoder(response.Body)
err = decoder.Decode(&errors)
if err != nil {
return err
}
return errors
default:
return &registry.UnexpectedHttpStatusError{Status: response.Status}
}
}
func (r *clientImpl) DeleteImage(name, tag string) error {
deleteRequest, err := http.NewRequest("DELETE",
r.imageManifestUrl(name, tag), nil)
if err != nil {
return err
}
response, err := http.DefaultClient.Do(deleteRequest)
if err != nil {
return err
}
defer response.Body.Close()
// TODO(bbland): handle other status codes, like 5xx errors
switch {
case response.StatusCode == http.StatusNoContent:
break
case response.StatusCode == http.StatusNotFound:
return &registry.ImageManifestNotFoundError{Name: name, Tag: tag}
case response.StatusCode >= 400 && response.StatusCode < 500:
errors := new(registry.Errors)
decoder := json.NewDecoder(response.Body)
err = decoder.Decode(&errors)
if err != nil {
return err
}
return errors
default:
return &registry.UnexpectedHttpStatusError{Status: response.Status}
}
return nil
}
func (r *clientImpl) ListImageTags(name string) ([]string, error) {
response, err := http.Get(fmt.Sprintf("%s/v2/%s/tags", r.Endpoint, name))
if err != nil {
return nil, err
}
defer response.Body.Close()
// TODO(bbland): handle other status codes, like 5xx errors
switch {
case response.StatusCode == http.StatusOK:
break
case response.StatusCode == http.StatusNotFound:
return nil, &registry.RepositoryNotFoundError{Name: name}
case response.StatusCode >= 400 && response.StatusCode < 500:
errors := new(registry.Errors)
decoder := json.NewDecoder(response.Body)
err = decoder.Decode(&errors)
if err != nil {
return nil, err
}
return nil, errors
default:
return nil, &registry.UnexpectedHttpStatusError{Status: response.Status}
}
tags := struct {
Tags []string `json:"tags"`
}{}
decoder := json.NewDecoder(response.Body)
err = decoder.Decode(&tags)
if err != nil {
return nil, err
}
return tags.Tags, nil
}
func (r *clientImpl) GetImageLayer(name, tarsum string, byteOffset int) (io.ReadCloser, int, error) {
getRequest, err := http.NewRequest("GET",
fmt.Sprintf("%s/v2/%s/layer/%s", r.Endpoint, name, tarsum), nil)
if err != nil {
return nil, 0, err
}
getRequest.Header.Add("Range", fmt.Sprintf("%d-", byteOffset))
response, err := http.DefaultClient.Do(getRequest)
if err != nil {
return nil, 0, err
}
if response.StatusCode == http.StatusNotFound {
return nil, 0, &registry.LayerNotFoundError{Name: name, TarSum: tarsum}
}
// TODO(bbland): handle other status codes, like 5xx errors
switch {
case response.StatusCode == http.StatusOK:
lengthHeader := response.Header.Get("Content-Length")
length, err := strconv.ParseInt(lengthHeader, 10, 0)
if err != nil {
return nil, 0, err
}
return response.Body, int(length), nil
case response.StatusCode == http.StatusNotFound:
response.Body.Close()
return nil, 0, &registry.LayerNotFoundError{Name: name, TarSum: tarsum}
case response.StatusCode >= 400 && response.StatusCode < 500:
errors := new(registry.Errors)
decoder := json.NewDecoder(response.Body)
err = decoder.Decode(&errors)
if err != nil {
return nil, 0, err
}
return nil, 0, errors
default:
response.Body.Close()
return nil, 0, &registry.UnexpectedHttpStatusError{Status: response.Status}
}
}
func (r *clientImpl) InitiateLayerUpload(name, tarsum string) (string, error) {
postRequest, err := http.NewRequest("POST",
fmt.Sprintf("%s/v2/%s/layer/%s/upload", r.Endpoint, name, tarsum), nil)
if err != nil {
return "", err
}
response, err := http.DefaultClient.Do(postRequest)
if err != nil {
return "", err
}
defer response.Body.Close()
// TODO(bbland): handle other status codes, like 5xx errors
switch {
case response.StatusCode == http.StatusAccepted:
return response.Header.Get("Location"), nil
case response.StatusCode == http.StatusNotModified:
return "", &registry.LayerAlreadyExistsError{Name: name, TarSum: tarsum}
case response.StatusCode >= 400 && response.StatusCode < 500:
errors := new(registry.Errors)
decoder := json.NewDecoder(response.Body)
err = decoder.Decode(&errors)
if err != nil {
return "", err
}
return "", errors
default:
return "", &registry.UnexpectedHttpStatusError{Status: response.Status}
}
}
func (r *clientImpl) GetLayerUploadStatus(location string) (int, int, error) {
response, err := http.Get(fmt.Sprintf("%s%s", r.Endpoint, location))
if err != nil {
return 0, 0, err
}
defer response.Body.Close()
// TODO(bbland): handle other status codes, like 5xx errors
switch {
case response.StatusCode == http.StatusNoContent:
return parseRangeHeader(response.Header.Get("Range"))
case response.StatusCode == http.StatusNotFound:
return 0, 0, &registry.LayerUploadNotFoundError{Location: location}
case response.StatusCode >= 400 && response.StatusCode < 500:
errors := new(registry.Errors)
decoder := json.NewDecoder(response.Body)
err = decoder.Decode(&errors)
if err != nil {
return 0, 0, err
}
return 0, 0, errors
default:
return 0, 0, &registry.UnexpectedHttpStatusError{Status: response.Status}
}
}
func (r *clientImpl) UploadLayer(location string, layer io.ReadCloser, length int, checksum *registry.Checksum) error {
defer layer.Close()
putRequest, err := http.NewRequest("PUT",
fmt.Sprintf("%s%s", r.Endpoint, location), layer)
if err != nil {
return err
}
queryValues := new(url.Values)
queryValues.Set("length", fmt.Sprint(length))
queryValues.Set(checksum.HashAlgorithm, checksum.Sum)
putRequest.URL.RawQuery = queryValues.Encode()
putRequest.Header.Set("Content-Type", "application/octet-stream")
putRequest.Header.Set("Content-Length", fmt.Sprint(length))
response, err := http.DefaultClient.Do(putRequest)
if err != nil {
return err
}
defer response.Body.Close()
// TODO(bbland): handle other status codes, like 5xx errors
switch {
case response.StatusCode == http.StatusCreated:
return nil
case response.StatusCode == http.StatusNotFound:
return &registry.LayerUploadNotFoundError{Location: location}
case response.StatusCode >= 400 && response.StatusCode < 500:
errors := new(registry.Errors)
decoder := json.NewDecoder(response.Body)
err = decoder.Decode(&errors)
if err != nil {
return err
}
return errors
default:
return &registry.UnexpectedHttpStatusError{Status: response.Status}
}
}
func (r *clientImpl) UploadLayerChunk(location string, layerChunk io.ReadCloser, length, startByte int) error {
defer layerChunk.Close()
putRequest, err := http.NewRequest("PUT",
fmt.Sprintf("%s%s", r.Endpoint, location), layerChunk)
if err != nil {
return err
}
endByte := startByte + length
putRequest.Header.Set("Content-Type", "application/octet-stream")
putRequest.Header.Set("Content-Length", fmt.Sprint(length))
putRequest.Header.Set("Content-Range",
fmt.Sprintf("%d-%d/%d", startByte, endByte, endByte))
response, err := http.DefaultClient.Do(putRequest)
if err != nil {
return err
}
defer response.Body.Close()
// TODO(bbland): handle other status codes, like 5xx errors
switch {
case response.StatusCode == http.StatusAccepted:
return nil
case response.StatusCode == http.StatusRequestedRangeNotSatisfiable:
lastValidRange, layerSize, err := parseRangeHeader(response.Header.Get("Range"))
if err != nil {
return err
}
return &registry.LayerUploadInvalidRangeError{
Location: location,
LastValidRange: lastValidRange,
LayerSize: layerSize,
}
case response.StatusCode == http.StatusNotFound:
return &registry.LayerUploadNotFoundError{Location: location}
case response.StatusCode >= 400 && response.StatusCode < 500:
errors := new(registry.Errors)
decoder := json.NewDecoder(response.Body)
err = decoder.Decode(&errors)
if err != nil {
return err
}
return errors
default:
return &registry.UnexpectedHttpStatusError{Status: response.Status}
}
}
func (r *clientImpl) FinishChunkedLayerUpload(location string, length int, checksum *registry.Checksum) error {
putRequest, err := http.NewRequest("PUT",
fmt.Sprintf("%s%s", r.Endpoint, location), nil)
if err != nil {
return err
}
queryValues := new(url.Values)
queryValues.Set("length", fmt.Sprint(length))
queryValues.Set(checksum.HashAlgorithm, checksum.Sum)
putRequest.URL.RawQuery = queryValues.Encode()
putRequest.Header.Set("Content-Type", "application/octet-stream")
putRequest.Header.Set("Content-Length", "0")
putRequest.Header.Set("Content-Range",
fmt.Sprintf("%d-%d/%d", length, length, length))
response, err := http.DefaultClient.Do(putRequest)
if err != nil {
return err
}
defer response.Body.Close()
// TODO(bbland): handle other status codes, like 5xx errors
switch {
case response.StatusCode == http.StatusCreated:
return nil
case response.StatusCode == http.StatusNotFound:
return &registry.LayerUploadNotFoundError{Location: location}
case response.StatusCode >= 400 && response.StatusCode < 500:
errors := new(registry.Errors)
decoder := json.NewDecoder(response.Body)
err = decoder.Decode(&errors)
if err != nil {
return err
}
return errors
default:
return &registry.UnexpectedHttpStatusError{Status: response.Status}
}
}
func (r *clientImpl) CancelLayerUpload(location string) error {
deleteRequest, err := http.NewRequest("DELETE",
fmt.Sprintf("%s%s", r.Endpoint, location), nil)
if err != nil {
return err
}
response, err := http.DefaultClient.Do(deleteRequest)
if err != nil {
return err
}
defer response.Body.Close()
// TODO(bbland): handle other status codes, like 5xx errors
switch {
case response.StatusCode == http.StatusNoContent:
return nil
case response.StatusCode == http.StatusNotFound:
return &registry.LayerUploadNotFoundError{Location: location}
case response.StatusCode >= 400 && response.StatusCode < 500:
errors := new(registry.Errors)
decoder := json.NewDecoder(response.Body)
err = decoder.Decode(&errors)
if err != nil {
return err
}
return errors
default:
return &registry.UnexpectedHttpStatusError{Status: response.Status}
}
}
// imageManifestUrl is a helper method for returning the full url to an image
// manifest
func (r *clientImpl) imageManifestUrl(name, tag string) string {
return fmt.Sprintf("%s/v2/%s/image/%s", r.Endpoint, name, tag)
}
// parseRangeHeader parses out the offset and length from a returned Range
// header
func parseRangeHeader(byteRangeHeader string) (int, int, error) {
r := regexp.MustCompile("bytes=0-(\\d+)/(\\d+)")
submatches := r.FindStringSubmatch(byteRangeHeader)
offset, err := strconv.ParseInt(submatches[1], 10, 0)
if err != nil {
return 0, 0, err
}
length, err := strconv.ParseInt(submatches[2], 10, 0)
if err != nil {
return 0, 0, err
}
return int(offset), int(length), nil
}