Merge pull request #740 from BrianBland/ng-push-pull
WIP: Adds push/pull client functionalitymaster
Olivier Gambier
commit
a2d232aaec
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@ -183,7 +183,7 @@ func (r *clientImpl) DeleteImage(name, tag string) error {
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}
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func (r *clientImpl) ListImageTags(name string) ([]string, error) {
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response, err := http.Get(fmt.Sprintf("%s/v2/%s/tags", r.Endpoint, name))
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response, err := http.Get(fmt.Sprintf("%s/v2/%s/tags/list", r.Endpoint, name))
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if err != nil {
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return nil, err
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}
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@ -264,7 +264,7 @@ func (r *clientImpl) GetImageLayer(name, tarsum string, byteOffset int) (io.Read
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func (r *clientImpl) InitiateLayerUpload(name, tarsum string) (string, error) {
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postRequest, err := http.NewRequest("POST",
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fmt.Sprintf("%s/v2/%s/layer/%s/upload", r.Endpoint, name, tarsum), nil)
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fmt.Sprintf("%s/v2/%s/layer/%s/upload/", r.Endpoint, name, tarsum), nil)
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if err != nil {
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return "", err
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}
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@ -329,7 +329,7 @@ func (r *clientImpl) UploadLayer(location string, layer io.ReadCloser, length in
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return err
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}
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queryValues := new(url.Values)
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queryValues := url.Values{}
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queryValues.Set("length", fmt.Sprint(length))
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queryValues.Set(checksum.HashAlgorithm, checksum.Sum)
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putRequest.URL.RawQuery = queryValues.Encode()
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@ -0,0 +1,238 @@
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package client
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import (
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"encoding/json"
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"fmt"
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"io/ioutil"
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"net/http"
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"net/http/httptest"
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"sync"
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"testing"
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"github.com/docker/docker-registry"
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"github.com/docker/docker-registry/test"
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)
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type testLayer struct {
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tarSum string
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contents []byte
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}
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func TestPush(t *testing.T) {
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name := "hello/world"
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tag := "sometag"
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testLayers := []testLayer{
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{
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tarSum: "12345",
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contents: []byte("some contents"),
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},
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{
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tarSum: "98765",
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contents: []byte("some other contents"),
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},
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}
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uploadLocations := make([]string, len(testLayers))
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layers := make([]registry.FSLayer, len(testLayers))
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history := make([]registry.ManifestHistory, len(testLayers))
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for i, layer := range testLayers {
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uploadLocations[i] = fmt.Sprintf("/v2/%s/layer/%s/upload-location-%d", name, layer.tarSum, i)
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layers[i] = registry.FSLayer{BlobSum: layer.tarSum}
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history[i] = registry.ManifestHistory{V1Compatibility: layer.tarSum}
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}
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manifest := ®istry.ImageManifest{
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Name: name,
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Tag: tag,
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Architecture: "x86",
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FSLayers: layers,
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History: history,
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SchemaVersion: 1,
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}
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manifestBytes, err := json.Marshal(manifest)
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layerRequestResponseMappings := make([]test.RequestResponseMapping, 2*len(testLayers))
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for i, layer := range testLayers {
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layerRequestResponseMappings[2*i] = test.RequestResponseMapping{
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Request: test.Request{
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Method: "POST",
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Route: "/v2/" + name + "/layer/" + layer.tarSum + "/upload/",
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},
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Responses: []test.Response{
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{
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StatusCode: http.StatusAccepted,
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Headers: http.Header(map[string][]string{
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"Location": {uploadLocations[i]},
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}),
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},
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},
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}
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layerRequestResponseMappings[2*i+1] = test.RequestResponseMapping{
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Request: test.Request{
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Method: "PUT",
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Route: uploadLocations[i],
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Body: layer.contents,
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},
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Responses: []test.Response{
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{
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StatusCode: http.StatusCreated,
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},
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},
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}
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}
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handler := test.NewHandler(append(layerRequestResponseMappings, test.RequestResponseMap{
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test.RequestResponseMapping{
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Request: test.Request{
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Method: "PUT",
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Route: "/v2/" + name + "/image/" + tag,
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Body: manifestBytes,
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},
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Responses: []test.Response{
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{
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StatusCode: http.StatusOK,
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},
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},
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},
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}...))
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server := httptest.NewServer(handler)
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client := New(server.URL)
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objectStore := &memoryObjectStore{
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mutex: new(sync.Mutex),
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manifestStorage: make(map[string]*registry.ImageManifest),
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layerStorage: make(map[string]Layer),
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}
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for _, layer := range testLayers {
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l, err := objectStore.Layer(layer.tarSum)
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if err != nil {
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t.Fatal(err)
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}
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writer, err := l.Writer()
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if err != nil {
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t.Fatal(err)
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}
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writer.Write(layer.contents)
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writer.Close()
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}
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objectStore.WriteManifest(name, tag, manifest)
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err = Push(client, objectStore, name, tag)
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if err != nil {
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t.Fatal(err)
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}
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}
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func TestPull(t *testing.T) {
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name := "hello/world"
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tag := "sometag"
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testLayers := []testLayer{
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{
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tarSum: "12345",
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contents: []byte("some contents"),
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},
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{
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tarSum: "98765",
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contents: []byte("some other contents"),
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},
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}
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layers := make([]registry.FSLayer, len(testLayers))
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history := make([]registry.ManifestHistory, len(testLayers))
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for i, layer := range testLayers {
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layers[i] = registry.FSLayer{BlobSum: layer.tarSum}
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history[i] = registry.ManifestHistory{V1Compatibility: layer.tarSum}
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}
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manifest := ®istry.ImageManifest{
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Name: name,
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Tag: tag,
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Architecture: "x86",
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FSLayers: layers,
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History: history,
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SchemaVersion: 1,
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}
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manifestBytes, err := json.Marshal(manifest)
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layerRequestResponseMappings := make([]test.RequestResponseMapping, len(testLayers))
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for i, layer := range testLayers {
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layerRequestResponseMappings[i] = test.RequestResponseMapping{
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Request: test.Request{
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Method: "GET",
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Route: "/v2/" + name + "/layer/" + layer.tarSum,
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},
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Responses: []test.Response{
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{
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StatusCode: http.StatusOK,
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Body: layer.contents,
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},
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},
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}
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}
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handler := test.NewHandler(append(layerRequestResponseMappings, test.RequestResponseMap{
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test.RequestResponseMapping{
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Request: test.Request{
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Method: "GET",
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Route: "/v2/" + name + "/image/" + tag,
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},
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Responses: []test.Response{
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{
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StatusCode: http.StatusOK,
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Body: manifestBytes,
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},
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},
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},
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}...))
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server := httptest.NewServer(handler)
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client := New(server.URL)
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objectStore := &memoryObjectStore{
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mutex: new(sync.Mutex),
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manifestStorage: make(map[string]*registry.ImageManifest),
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layerStorage: make(map[string]Layer),
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}
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err = Pull(client, objectStore, name, tag)
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if err != nil {
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t.Fatal(err)
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}
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m, err := objectStore.Manifest(name, tag)
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if err != nil {
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t.Fatal(err)
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}
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mBytes, err := json.Marshal(m)
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if err != nil {
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t.Fatal(err)
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}
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if string(mBytes) != string(manifestBytes) {
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t.Fatal("Incorrect manifest")
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}
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for _, layer := range testLayers {
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l, err := objectStore.Layer(layer.tarSum)
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if err != nil {
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t.Fatal(err)
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}
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reader, err := l.Reader()
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if err != nil {
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t.Fatal(err)
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}
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defer reader.Close()
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layerBytes, err := ioutil.ReadAll(reader)
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if err != nil {
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t.Fatal(err)
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}
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if string(layerBytes) != string(layer.contents) {
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t.Fatal("Incorrect layer")
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}
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}
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}
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@ -0,0 +1,158 @@
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package client
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import (
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"bytes"
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"errors"
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"fmt"
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"io"
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"io/ioutil"
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"sync"
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"github.com/docker/docker-registry"
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)
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var (
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// ErrLayerAlreadyExists is returned when attempting to create a layer with
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// a tarsum that is already in use.
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ErrLayerAlreadyExists = errors.New("Layer already exists")
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// ErrLayerLocked is returned when attempting to write to a layer which is
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// currently being written to.
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ErrLayerLocked = errors.New("Layer locked")
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)
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// ObjectStore is an interface which is designed to approximate the docker
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// engine storage. This interface is subject to change to conform to the
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// future requirements of the engine.
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type ObjectStore interface {
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// Manifest retrieves the image manifest stored at the given repository name
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// and tag
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Manifest(name, tag string) (*registry.ImageManifest, error)
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// WriteManifest stores an image manifest at the given repository name and
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// tag
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WriteManifest(name, tag string, manifest *registry.ImageManifest) error
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// Layer returns a handle to a layer for reading and writing
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Layer(blobSum string) (Layer, error)
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}
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// Layer is a generic image layer interface.
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// A Layer may only be written to once
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type Layer interface {
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// Reader returns an io.ReadCloser which reads the contents of the layer
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Reader() (io.ReadCloser, error)
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// Writer returns an io.WriteCloser which may write the contents of the
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// layer. This method may only be called once per Layer, and the contents
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// are made available on Close
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Writer() (io.WriteCloser, error)
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// Wait blocks until the Layer can be read from
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Wait() error
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}
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// memoryObjectStore is an in-memory implementation of the ObjectStore interface
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type memoryObjectStore struct {
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mutex *sync.Mutex
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manifestStorage map[string]*registry.ImageManifest
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layerStorage map[string]Layer
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}
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func (objStore *memoryObjectStore) Manifest(name, tag string) (*registry.ImageManifest, error) {
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objStore.mutex.Lock()
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defer objStore.mutex.Unlock()
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manifest, ok := objStore.manifestStorage[name+":"+tag]
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if !ok {
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return nil, fmt.Errorf("No manifest found with Name: %q, Tag: %q", name, tag)
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}
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return manifest, nil
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}
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func (objStore *memoryObjectStore) WriteManifest(name, tag string, manifest *registry.ImageManifest) error {
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objStore.mutex.Lock()
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defer objStore.mutex.Unlock()
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objStore.manifestStorage[name+":"+tag] = manifest
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return nil
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}
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func (objStore *memoryObjectStore) Layer(blobSum string) (Layer, error) {
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objStore.mutex.Lock()
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defer objStore.mutex.Unlock()
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layer, ok := objStore.layerStorage[blobSum]
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if !ok {
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layer = &memoryLayer{cond: sync.NewCond(new(sync.Mutex))}
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objStore.layerStorage[blobSum] = layer
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}
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return layer, nil
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}
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type memoryLayer struct {
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cond *sync.Cond
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buffer *bytes.Buffer
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written bool
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}
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func (ml *memoryLayer) Writer() (io.WriteCloser, error) {
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ml.cond.L.Lock()
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defer ml.cond.L.Unlock()
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if ml.buffer != nil {
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if !ml.written {
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return nil, ErrLayerLocked
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}
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return nil, ErrLayerAlreadyExists
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}
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ml.buffer = new(bytes.Buffer)
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return &memoryLayerWriter{cond: ml.cond, buffer: ml.buffer, done: &ml.written}, nil
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}
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func (ml *memoryLayer) Reader() (io.ReadCloser, error) {
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ml.cond.L.Lock()
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defer ml.cond.L.Unlock()
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if ml.buffer == nil {
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return nil, fmt.Errorf("Layer has not been written to yet")
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}
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if !ml.written {
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return nil, ErrLayerLocked
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}
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return ioutil.NopCloser(bytes.NewReader(ml.buffer.Bytes())), nil
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}
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func (ml *memoryLayer) Wait() error {
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ml.cond.L.Lock()
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defer ml.cond.L.Unlock()
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if ml.buffer == nil {
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return fmt.Errorf("No writer to wait on")
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}
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for !ml.written {
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ml.cond.Wait()
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}
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return nil
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}
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type memoryLayerWriter struct {
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cond *sync.Cond
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buffer *bytes.Buffer
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done *bool
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}
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func (mlw *memoryLayerWriter) Write(p []byte) (int, error) {
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return mlw.buffer.Write(p)
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}
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func (mlw *memoryLayerWriter) Close() error {
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*mlw.done = true
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mlw.cond.Broadcast()
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return nil
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}
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@ -0,0 +1,93 @@
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package client
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import (
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"fmt"
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"io"
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log "github.com/Sirupsen/logrus"
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)
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// Pull implements a client pull workflow for the image defined by the given
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// name and tag pair, using the given ObjectStore for local manifest and layer
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// storage
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func Pull(c Client, objectStore ObjectStore, name, tag string) error {
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manifest, err := c.GetImageManifest(name, tag)
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if err != nil {
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return err
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}
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log.WithField("manifest", manifest).Info("Pulled manifest")
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if len(manifest.FSLayers) != len(manifest.History) {
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return fmt.Errorf("Length of history not equal to number of layers")
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}
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if len(manifest.FSLayers) == 0 {
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return fmt.Errorf("Image has no layers")
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}
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for _, fsLayer := range manifest.FSLayers {
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layer, err := objectStore.Layer(fsLayer.BlobSum)
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if err != nil {
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log.WithFields(log.Fields{
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"error": err,
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"layer": fsLayer,
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}).Warn("Unable to write local layer")
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return err
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}
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writer, err := layer.Writer()
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if err == ErrLayerAlreadyExists {
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log.WithField("layer", fsLayer).Info("Layer already exists")
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continue
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}
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if err == ErrLayerLocked {
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log.WithField("layer", fsLayer).Info("Layer download in progress, waiting")
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layer.Wait()
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continue
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}
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if err != nil {
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log.WithFields(log.Fields{
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"error": err,
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"layer": fsLayer,
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}).Warn("Unable to write local layer")
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return err
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}
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defer writer.Close()
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layerReader, length, err := c.GetImageLayer(name, fsLayer.BlobSum, 0)
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if err != nil {
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log.WithFields(log.Fields{
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"error": err,
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"layer": fsLayer,
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}).Warn("Unable to download layer")
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return err
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}
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defer layerReader.Close()
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copied, err := io.Copy(writer, layerReader)
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if err != nil {
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log.WithFields(log.Fields{
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"error": err,
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"layer": fsLayer,
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}).Warn("Unable to download layer")
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return err
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}
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if copied != int64(length) {
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log.WithFields(log.Fields{
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"expected": length,
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"written": copied,
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"layer": fsLayer,
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}).Warn("Wrote incorrect number of bytes for layer")
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}
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}
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err = objectStore.WriteManifest(name, tag, manifest)
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if err != nil {
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log.WithFields(log.Fields{
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"error": err,
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"manifest": manifest,
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}).Warn("Unable to write image manifest")
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return err
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}
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return nil
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}
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|
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@ -0,0 +1,95 @@
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package client
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|
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import (
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"bytes"
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"crypto/sha1"
|
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"io"
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"io/ioutil"
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|
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"github.com/docker/docker-registry"
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log "github.com/Sirupsen/logrus"
|
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)
|
||||
|
||||
// Push implements a client push workflow for the image defined by the given
|
||||
// name and tag pair, using the given ObjectStore for local manifest and layer
|
||||
// storage
|
||||
func Push(c Client, objectStore ObjectStore, name, tag string) error {
|
||||
manifest, err := objectStore.Manifest(name, tag)
|
||||
if err != nil {
|
||||
log.WithFields(log.Fields{
|
||||
"error": err,
|
||||
"name": name,
|
||||
"tag": tag,
|
||||
}).Info("No image found")
|
||||
return err
|
||||
}
|
||||
|
||||
for _, fsLayer := range manifest.FSLayers {
|
||||
layer, err := objectStore.Layer(fsLayer.BlobSum)
|
||||
if err != nil {
|
||||
log.WithFields(log.Fields{
|
||||
"error": err,
|
||||
"layer": fsLayer,
|
||||
}).Warn("Unable to read local layer")
|
||||
return err
|
||||
}
|
||||
|
||||
layerReader, err := layer.Reader()
|
||||
if err != nil {
|
||||
log.WithFields(log.Fields{
|
||||
"error": err,
|
||||
"layer": fsLayer,
|
||||
}).Warn("Unable to read local layer")
|
||||
return err
|
||||
}
|
||||
|
||||
location, err := c.InitiateLayerUpload(name, fsLayer.BlobSum)
|
||||
if _, ok := err.(*registry.LayerAlreadyExistsError); ok {
|
||||
log.WithField("layer", fsLayer).Info("Layer already exists")
|
||||
continue
|
||||
}
|
||||
if err != nil {
|
||||
log.WithFields(log.Fields{
|
||||
"error": err,
|
||||
"layer": fsLayer,
|
||||
}).Warn("Unable to upload layer")
|
||||
return err
|
||||
}
|
||||
|
||||
layerBuffer := new(bytes.Buffer)
|
||||
checksum := sha1.New()
|
||||
teeReader := io.TeeReader(layerReader, checksum)
|
||||
|
||||
_, err = io.Copy(layerBuffer, teeReader)
|
||||
if err != nil {
|
||||
log.WithFields(log.Fields{
|
||||
"error": err,
|
||||
"layer": fsLayer,
|
||||
}).Warn("Unable to read local layer")
|
||||
return err
|
||||
}
|
||||
|
||||
err = c.UploadLayer(location, ioutil.NopCloser(layerBuffer), layerBuffer.Len(),
|
||||
®istry.Checksum{HashAlgorithm: "sha1", Sum: string(checksum.Sum(nil))},
|
||||
)
|
||||
if err != nil {
|
||||
log.WithFields(log.Fields{
|
||||
"error": err,
|
||||
"layer": fsLayer,
|
||||
}).Warn("Unable to upload layer")
|
||||
return err
|
||||
}
|
||||
}
|
||||
|
||||
err = c.PutImageManifest(name, tag, manifest)
|
||||
if err != nil {
|
||||
log.WithFields(log.Fields{
|
||||
"error": err,
|
||||
"manifest": manifest,
|
||||
}).Warn("Unable to upload manifest")
|
||||
return err
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
|
|
@ -0,0 +1,97 @@
|
|||
package test
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"fmt"
|
||||
"io"
|
||||
"io/ioutil"
|
||||
"net/http"
|
||||
)
|
||||
|
||||
// RequestResponseMap is a mapping from Requests to Responses
|
||||
type RequestResponseMap []RequestResponseMapping
|
||||
|
||||
// RequestResponseMapping defines an ordered list of Responses to be sent in
|
||||
// response to a given Request
|
||||
type RequestResponseMapping struct {
|
||||
Request Request
|
||||
Responses []Response
|
||||
}
|
||||
|
||||
// TODO(bbland): add support for request headers
|
||||
|
||||
// Request is a simplified http.Request object
|
||||
type Request struct {
|
||||
// Method is the http method of the request, for example GET
|
||||
Method string
|
||||
|
||||
// Route is the http route of this request
|
||||
Route string
|
||||
|
||||
// Body is the byte contents of the http request
|
||||
Body []byte
|
||||
}
|
||||
|
||||
func (r Request) String() string {
|
||||
return fmt.Sprintf("%s %s\n%s", r.Method, r.Route, r.Body)
|
||||
}
|
||||
|
||||
// Response is a simplified http.Response object
|
||||
type Response struct {
|
||||
// Statuscode is the http status code of the Response
|
||||
StatusCode int
|
||||
|
||||
// Headers are the http headers of this Response
|
||||
Headers http.Header
|
||||
|
||||
// Body is the response body
|
||||
Body []byte
|
||||
}
|
||||
|
||||
// testHandler is an http.Handler with a defined mapping from Request to an
|
||||
// ordered list of Response objects
|
||||
type testHandler struct {
|
||||
responseMap map[string][]Response
|
||||
}
|
||||
|
||||
// NewHandler returns a new test handler that responds to defined requests
|
||||
// with specified responses
|
||||
// Each time a Request is received, the next Response is returned in the
|
||||
// mapping, until no Responses are defined, at which point a 404 is sent back
|
||||
func NewHandler(requestResponseMap RequestResponseMap) http.Handler {
|
||||
responseMap := make(map[string][]Response)
|
||||
for _, mapping := range requestResponseMap {
|
||||
responseMap[mapping.Request.String()] = mapping.Responses
|
||||
}
|
||||
return &testHandler{responseMap: responseMap}
|
||||
}
|
||||
|
||||
func (app *testHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
|
||||
defer r.Body.Close()
|
||||
|
||||
requestBody, _ := ioutil.ReadAll(r.Body)
|
||||
request := Request{
|
||||
Method: r.Method,
|
||||
Route: r.URL.Path,
|
||||
Body: requestBody,
|
||||
}
|
||||
|
||||
responses, ok := app.responseMap[request.String()]
|
||||
|
||||
if !ok || len(responses) == 0 {
|
||||
http.NotFound(w, r)
|
||||
return
|
||||
}
|
||||
|
||||
response := responses[0]
|
||||
app.responseMap[request.String()] = responses[1:]
|
||||
|
||||
responseHeader := w.Header()
|
||||
for k, v := range response.Headers {
|
||||
responseHeader[k] = v
|
||||
}
|
||||
|
||||
w.WriteHeader(response.StatusCode)
|
||||
|
||||
io.Copy(w, bytes.NewReader(response.Body))
|
||||
}
|
||||
Loading…
Reference in New Issue