Update to track refactor updates

Added use of cache blob statter

Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)

docs/client/blob.go

@@ -1,159 +0,0 @@
-package client
-
-import (
-	"bufio"
-	"bytes"
-	"fmt"
-	"io"
-	"io/ioutil"
-	"net/http"
-	"os"
-
-	"github.com/docker/distribution"
-	"github.com/docker/distribution/context"
-)
-
-type httpBlob struct {
-	*repository
-
-	desc distribution.Descriptor
-
-	rc     io.ReadCloser // remote read closer
-	brd    *bufio.Reader // internal buffered io
-	offset int64
-	err    error
-}
-
-func (hb *httpBlob) Read(p []byte) (n int, err error) {
-	if hb.err != nil {
-		return 0, hb.err
-	}
-
-	rd, err := hb.reader()
-	if err != nil {
-		return 0, err
-	}
-
-	n, err = rd.Read(p)
-	hb.offset += int64(n)
-
-	// Simulate io.EOF error if we reach filesize.
-	if err == nil && hb.offset >= hb.desc.Length {
-		err = io.EOF
-	}
-
-	return n, err
-}
-
-func (hb *httpBlob) Seek(offset int64, whence int) (int64, error) {
-	if hb.err != nil {
-		return 0, hb.err
-	}
-
-	var err error
-	newOffset := hb.offset
-
-	switch whence {
-	case os.SEEK_CUR:
-		newOffset += int64(offset)
-	case os.SEEK_END:
-		newOffset = hb.desc.Length + int64(offset)
-	case os.SEEK_SET:
-		newOffset = int64(offset)
-	}
-
-	if newOffset < 0 {
-		err = fmt.Errorf("cannot seek to negative position")
-	} else {
-		if hb.offset != newOffset {
-			hb.reset()
-		}
-
-		// No problems, set the offset.
-		hb.offset = newOffset
-	}
-
-	return hb.offset, err
-}
-
-func (hb *httpBlob) Close() error {
-	if hb.err != nil {
-		return hb.err
-	}
-
-	// close and release reader chain
-	if hb.rc != nil {
-		hb.rc.Close()
-	}
-
-	hb.rc = nil
-	hb.brd = nil
-
-	hb.err = fmt.Errorf("httpBlob: closed")
-
-	return nil
-}
-
-func (hb *httpBlob) reset() {
-	if hb.err != nil {
-		return
-	}
-	if hb.rc != nil {
-		hb.rc.Close()
-		hb.rc = nil
-	}
-}
-
-func (hb *httpBlob) reader() (io.Reader, error) {
-	if hb.err != nil {
-		return nil, hb.err
-	}
-
-	if hb.rc != nil {
-		return hb.brd, nil
-	}
-
-	// If the offset is great than or equal to size, return a empty, noop reader.
-	if hb.offset >= hb.desc.Length {
-		return ioutil.NopCloser(bytes.NewReader([]byte{})), nil
-	}
-
-	blobURL, err := hb.ub.BuildBlobURL(hb.name, hb.desc.Digest)
-	if err != nil {
-		return nil, err
-	}
-
-	req, err := http.NewRequest("GET", blobURL, nil)
-	if err != nil {
-		return nil, err
-	}
-
-	if hb.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-"))
-		context.GetLogger(hb.context).Infof("Range: %s", req.Header.Get("Range"))
-	}
-
-	resp, err := hb.client.Do(req)
-	if err != nil {
-		return nil, err
-	}
-
-	switch {
-	case resp.StatusCode == 200:
-		hb.rc = resp.Body
-	default:
-		defer resp.Body.Close()
-		return nil, fmt.Errorf("unexpected status resolving reader: %v", resp.Status)
-	}
-
-	if hb.brd == nil {
-		hb.brd = bufio.NewReader(hb.rc)
-	} else {
-		hb.brd.Reset(hb.rc)
-	}
-
-	return hb.brd, nil
-}

docs/client/blob_writer.go

@@ -151,7 +151,7 @@ func (hbu *httpBlobUpload) Commit(ctx context.Context, desc distribution.Descrip
 	return hbu.repo.Blobs(ctx).Stat(ctx, desc.Digest)
 }
 
-func (hbu *httpBlobUpload) Rollback(ctx context.Context) error {
+func (hbu *httpBlobUpload) Cancel(ctx context.Context) error {
 	panic("not implemented")
 }
 

docs/client/http_reader.go

@@ -0,0 +1,164 @@
+package client
+
+import (
+	"bufio"
+	"bytes"
+	"errors"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"net/http"
+	"os"
+
+	"github.com/docker/distribution"
+)
+
+func NewHTTPReadSeeker(client *http.Client, url string, size int64) distribution.ReadSeekCloser {
+	return &httpReadSeeker{
+		client: client,
+		url:    url,
+		size:   size,
+	}
+}
+
+type httpReadSeeker struct {
+	client *http.Client
+	url    string
+
+	size int64
+
+	rc     io.ReadCloser // remote read closer
+	brd    *bufio.Reader // internal buffered io
+	offset int64
+	err    error
+}
+
+func (hrs *httpReadSeeker) Read(p []byte) (n int, err error) {
+	if hrs.err != nil {
+		return 0, hrs.err
+	}
+
+	rd, err := hrs.reader()
+	if err != nil {
+		return 0, err
+	}
+
+	n, err = rd.Read(p)
+	hrs.offset += int64(n)
+
+	// Simulate io.EOF error if we reach filesize.
+	if err == nil && hrs.offset >= hrs.size {
+		err = io.EOF
+	}
+
+	return n, err
+}
+
+func (hrs *httpReadSeeker) Seek(offset int64, whence int) (int64, error) {
+	if hrs.err != nil {
+		return 0, hrs.err
+	}
+
+	var err error
+	newOffset := hrs.offset
+
+	switch whence {
+	case os.SEEK_CUR:
+		newOffset += int64(offset)
+	case os.SEEK_END:
+		newOffset = hrs.size + int64(offset)
+	case os.SEEK_SET:
+		newOffset = int64(offset)
+	}
+
+	if newOffset < 0 {
+		err = errors.New("cannot seek to negative position")
+	} else {
+		if hrs.offset != newOffset {
+			hrs.reset()
+		}
+
+		// No problems, set the offset.
+		hrs.offset = newOffset
+	}
+
+	return hrs.offset, err
+}
+
+func (hrs *httpReadSeeker) Close() error {
+	if hrs.err != nil {
+		return hrs.err
+	}
+
+	// close and release reader chain
+	if hrs.rc != nil {
+		hrs.rc.Close()
+	}
+
+	hrs.rc = nil
+	hrs.brd = nil
+
+	hrs.err = errors.New("httpLayer: closed")
+
+	return nil
+}
+
+func (hrs *httpReadSeeker) reset() {
+	if hrs.err != nil {
+		return
+	}
+	if hrs.rc != nil {
+		hrs.rc.Close()
+		hrs.rc = nil
+	}
+}
+
+func (hrs *httpReadSeeker) reader() (io.Reader, error) {
+	if hrs.err != nil {
+		return nil, hrs.err
+	}
+
+	if hrs.rc != nil {
+		return hrs.brd, nil
+	}
+
+	// If the offset is great than or equal to size, return a empty, noop reader.
+	if hrs.offset >= hrs.size {
+		return ioutil.NopCloser(bytes.NewReader([]byte{})), nil
+	}
+
+	req, err := http.NewRequest("GET", hrs.url, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	if hrs.offset > 0 {
+		// TODO(stevvooe): Get this working correctly.
+
+		// If we are at different offset, issue a range request from there.
+		req.Header.Add("Range", "1-")
+		// TODO: get context in here
+		// context.GetLogger(hrs.context).Infof("Range: %s", req.Header.Get("Range"))
+	}
+
+	resp, err := hrs.client.Do(req)
+	if err != nil {
+		return nil, err
+	}
+
+	switch {
+	case resp.StatusCode == 200:
+		hrs.rc = resp.Body
+	default:
+		defer resp.Body.Close()
+		return nil, fmt.Errorf("unexpected status resolving reader: %v", resp.Status)
+	}
+
+	if hrs.brd == nil {
+		hrs.brd = bufio.NewReader(hrs.rc)
+	} else {
+		hrs.brd.Reset(hrs.rc)
+	}
+
+	return hrs.brd, nil
+}

docs/client/repository.go

@@ -18,6 +18,7 @@ import (
 	"github.com/docker/distribution"
 	"github.com/docker/distribution/context"
 	"github.com/docker/distribution/registry/api/v2"
+	"github.com/docker/distribution/registry/storage/cache"
 )
 
 // NewRepository creates a new Repository for the given repository name and endpoint
@@ -56,9 +57,13 @@ func (r *repository) Name() string {
 	return r.name
 }
 
-func (r *repository) Blobs(ctx context.Context) distribution.BlobService {
+func (r *repository) Blobs(ctx context.Context) distribution.BlobStore {
+	statter := &blobStatter{
+		repository: r,
+	}
 	return &blobs{
 		repository: r,
+		statter:    cache.NewCachedBlobStatter(cache.NewInMemoryBlobDescriptorCacheProvider(), statter),
 	}
 }
 
@@ -232,6 +237,8 @@ func (ms *manifests) Delete(dgst digest.Digest) error {
 
 type blobs struct {
 	*repository
+
+	statter distribution.BlobStatter
 }
 
 func sanitizeLocation(location, source string) (string, error) {
@@ -255,12 +262,17 @@ func sanitizeLocation(location, source string) (string, error) {
 	return location, nil
 }
 
+func (ls *blobs) Stat(ctx context.Context, dgst digest.Digest) (distribution.Descriptor, error) {
+	return ls.statter.Stat(ctx, dgst)
+
+}
+
 func (ls *blobs) Get(ctx context.Context, dgst digest.Digest) ([]byte, error) {
 	desc, err := ls.Stat(ctx, dgst)
 	if err != nil {
 		return nil, err
 	}
-	reader, err := ls.Open(ctx, desc)
+	reader, err := ls.Open(ctx, desc.Digest)
 	if err != nil {
 		return nil, err
 	}
@@ -269,19 +281,26 @@ func (ls *blobs) Get(ctx context.Context, dgst digest.Digest) ([]byte, error) {
 	return ioutil.ReadAll(reader)
 }
 
-func (ls *blobs) Open(ctx context.Context, desc distribution.Descriptor) (distribution.ReadSeekCloser, error) {
+func (ls *blobs) Open(ctx context.Context, dgst digest.Digest) (distribution.ReadSeekCloser, error) {
-	return &httpBlob{
+	stat, err := ls.statter.Stat(ctx, dgst)
-		repository: ls.repository,
+	if err != nil {
-		desc:       desc,
+		return nil, err
-	}, nil
+	}
+
+	blobURL, err := ls.ub.BuildBlobURL(ls.Name(), stat.Digest)
+	if err != nil {
+		return nil, err
+	}
+
+	return NewHTTPReadSeeker(ls.repository.client, blobURL, stat.Length), nil
 }
 
-func (ls *blobs) ServeBlob(ctx context.Context, w http.ResponseWriter, r *http.Request, desc distribution.Descriptor) error {
+func (ls *blobs) ServeBlob(ctx context.Context, w http.ResponseWriter, r *http.Request, dgst digest.Digest) error {
 	return nil
 }
 
 func (ls *blobs) Put(ctx context.Context, mediaType string, p []byte) (distribution.Descriptor, error) {
-	writer, err := ls.Writer(ctx)
+	writer, err := ls.Create(ctx)
 	if err != nil {
 		return distribution.Descriptor{}, err
 	}
@@ -303,7 +322,7 @@ func (ls *blobs) Put(ctx context.Context, mediaType string, p []byte) (distribut
 	return writer.Commit(ctx, desc)
 }
 
-func (ls *blobs) Writer(ctx context.Context) (distribution.BlobWriter, error) {
+func (ls *blobs) Create(ctx context.Context) (distribution.BlobWriter, error) {
 	u, err := ls.ub.BuildBlobUploadURL(ls.name)
 
 	resp, err := ls.client.Post(u, "", nil)
@@ -337,7 +356,11 @@ func (ls *blobs) Resume(ctx context.Context, id string) (distribution.BlobWriter
 	panic("not implemented")
 }
 
-func (ls *blobs) Stat(ctx context.Context, dgst digest.Digest) (distribution.Descriptor, error) {
+type blobStatter struct {
+	*repository
+}
+
+func (ls *blobStatter) Stat(ctx context.Context, dgst digest.Digest) (distribution.Descriptor, error) {
 	u, err := ls.ub.BuildBlobURL(ls.name, dgst)
 	if err != nil {
 		return distribution.Descriptor{}, err

docs/client/repository_test.go

@@ -237,7 +237,7 @@ func TestBlobUploadChunked(t *testing.T) {
 	}
 	l := r.Blobs(ctx)
 
-	upload, err := l.Writer(ctx)
+	upload, err := l.Create(ctx)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -348,7 +348,7 @@ func TestBlobUploadMonolithic(t *testing.T) {
 	}
 	l := r.Blobs(ctx)
 
-	upload, err := l.Writer(ctx)
+	upload, err := l.Create(ctx)
 	if err != nil {
 		t.Fatal(err)
 	}