Split layer and upload from repository
Layer upload moved to its own file with its own unit tests Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)
This commit is contained in:
Derek McGowan
@@ -1,21 +1,14 @@
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package client
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import (
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"bufio"
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"bytes"
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"encoding/json"
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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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"net/http"
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"net/url"
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"os"
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"strconv"
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"time"
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ctxu "github.com/docker/distribution/context"
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"github.com/docker/distribution/manifest"
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"github.com/docker/distribution/digest"
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@@ -276,7 +269,8 @@ func (ls *layers) Upload() (distribution.LayerUpload, error) {
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}
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return &httpLayerUpload{
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layers: ls,
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repo: ls.repository,
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client: ls.client,
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uuid: uuid,
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startedAt: time.Now(),
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location: location,
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@@ -339,319 +333,3 @@ func (ls *layers) fetchLayer(dgst digest.Digest) (distribution.Layer, error) {
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return nil, &UnexpectedHTTPStatusError{Status: resp.Status}
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}
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}
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type httpLayer struct {
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*layers
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size int64
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digest digest.Digest
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createdAt time.Time
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rc io.ReadCloser // remote read closer
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brd *bufio.Reader // internal buffered io
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offset int64
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err error
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}
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func (hl *httpLayer) CreatedAt() time.Time {
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return hl.createdAt
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}
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func (hl *httpLayer) Digest() digest.Digest {
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return hl.digest
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}
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func (hl *httpLayer) Read(p []byte) (n int, err error) {
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if hl.err != nil {
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return 0, hl.err
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}
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rd, err := hl.reader()
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if err != nil {
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return 0, err
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}
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n, err = rd.Read(p)
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hl.offset += int64(n)
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// Simulate io.EOR error if we reach filesize.
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if err == nil && hl.offset >= hl.size {
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err = io.EOF
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}
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return n, err
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}
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func (hl *httpLayer) Seek(offset int64, whence int) (int64, error) {
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if hl.err != nil {
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return 0, hl.err
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}
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var err error
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newOffset := hl.offset
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switch whence {
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case os.SEEK_CUR:
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newOffset += int64(offset)
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case os.SEEK_END:
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newOffset = hl.size + int64(offset)
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case os.SEEK_SET:
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newOffset = int64(offset)
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}
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if newOffset < 0 {
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err = fmt.Errorf("cannot seek to negative position")
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} else {
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if hl.offset != newOffset {
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hl.reset()
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}
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// No problems, set the offset.
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hl.offset = newOffset
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}
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return hl.offset, err
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}
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func (hl *httpLayer) Close() error {
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if hl.err != nil {
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return hl.err
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}
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// close and release reader chain
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if hl.rc != nil {
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hl.rc.Close()
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}
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hl.rc = nil
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hl.brd = nil
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hl.err = fmt.Errorf("httpLayer: closed")
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return nil
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}
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func (hl *httpLayer) reset() {
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if hl.err != nil {
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return
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}
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if hl.rc != nil {
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hl.rc.Close()
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hl.rc = nil
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}
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}
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func (hl *httpLayer) reader() (io.Reader, error) {
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if hl.err != nil {
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return nil, hl.err
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}
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if hl.rc != nil {
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return hl.brd, nil
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}
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// If the offset is great than or equal to size, return a empty, noop reader.
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if hl.offset >= hl.size {
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return ioutil.NopCloser(bytes.NewReader([]byte{})), nil
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}
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blobURL, err := hl.ub.BuildBlobURL(hl.name, hl.digest)
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if err != nil {
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return nil, err
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}
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req, err := http.NewRequest("GET", blobURL, nil)
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if err != nil {
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return nil, err
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}
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if hl.offset > 0 {
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// TODO(stevvooe): Get this working correctly.
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// If we are at different offset, issue a range request from there.
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req.Header.Add("Range", fmt.Sprintf("1-"))
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ctxu.GetLogger(hl.context).Infof("Range: %s", req.Header.Get("Range"))
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}
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resp, err := hl.client.Do(req)
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if err != nil {
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return nil, err
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}
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switch {
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case resp.StatusCode == 200:
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hl.rc = resp.Body
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default:
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defer resp.Body.Close()
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return nil, fmt.Errorf("unexpected status resolving reader: %v", resp.Status)
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}
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if hl.brd == nil {
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hl.brd = bufio.NewReader(hl.rc)
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} else {
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hl.brd.Reset(hl.rc)
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}
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return hl.brd, nil
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}
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func (hl *httpLayer) Length() int64 {
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return hl.size
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}
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func (hl *httpLayer) Handler(r *http.Request) (http.Handler, error) {
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panic("Not implemented")
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}
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type httpLayerUpload struct {
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*layers
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uuid string
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startedAt time.Time
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location string // always the last value of the location header.
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offset int64
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closed bool
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}
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var _ distribution.LayerUpload = &httpLayerUpload{}
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func (hlu *httpLayerUpload) ReadFrom(r io.Reader) (n int64, err error) {
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req, err := http.NewRequest("PATCH", hlu.location, r)
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if err != nil {
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return 0, err
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}
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defer req.Body.Close()
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resp, err := hlu.client.Do(req)
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if err != nil {
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return 0, err
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}
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switch {
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case resp.StatusCode == http.StatusAccepted:
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// TODO(dmcgowan): Validate headers
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hlu.uuid = resp.Header.Get("Docker-Upload-UUID")
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hlu.location, err = sanitizeLocation(resp.Header.Get("Location"), hlu.location)
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if err != nil {
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return 0, err
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}
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rng := resp.Header.Get("Range")
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var start, end int64
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if n, err := fmt.Sscanf(rng, "%d-%d", &start, &end); err != nil {
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return 0, err
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} else if n != 2 || end < start {
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return 0, fmt.Errorf("bad range format: %s", rng)
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}
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return (end - start + 1), nil
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case resp.StatusCode == http.StatusNotFound:
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return 0, &BlobUploadNotFoundError{Location: hlu.location}
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case resp.StatusCode >= 400 && resp.StatusCode < 500:
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return 0, parseHTTPErrorResponse(resp)
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default:
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return 0, &UnexpectedHTTPStatusError{Status: resp.Status}
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}
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}
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func (hlu *httpLayerUpload) Write(p []byte) (n int, err error) {
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req, err := http.NewRequest("PATCH", hlu.location, bytes.NewReader(p))
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if err != nil {
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return 0, err
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}
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req.Header.Set("Content-Range", fmt.Sprintf("%d-%d", hlu.offset, hlu.offset+int64(len(p)-1)))
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req.Header.Set("Content-Length", fmt.Sprintf("%d", len(p)))
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req.Header.Set("Content-Type", "application/octet-stream")
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resp, err := hlu.client.Do(req)
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if err != nil {
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return 0, err
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}
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switch {
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case resp.StatusCode == http.StatusAccepted:
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// TODO(dmcgowan): Validate headers
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hlu.uuid = resp.Header.Get("Docker-Upload-UUID")
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hlu.location, err = sanitizeLocation(resp.Header.Get("Location"), hlu.location)
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if err != nil {
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return 0, err
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}
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rng := resp.Header.Get("Range")
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var start, end int
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if n, err := fmt.Sscanf(rng, "%d-%d", &start, &end); err != nil {
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return 0, err
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} else if n != 2 || end < start {
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return 0, fmt.Errorf("bad range format: %s", rng)
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}
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return (end - start + 1), nil
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case resp.StatusCode == http.StatusNotFound:
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return 0, &BlobUploadNotFoundError{Location: hlu.location}
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case resp.StatusCode >= 400 && resp.StatusCode < 500:
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return 0, parseHTTPErrorResponse(resp)
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default:
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return 0, &UnexpectedHTTPStatusError{Status: resp.Status}
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}
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}
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func (hlu *httpLayerUpload) Seek(offset int64, whence int) (int64, error) {
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newOffset := hlu.offset
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switch whence {
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case os.SEEK_CUR:
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newOffset += int64(offset)
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case os.SEEK_END:
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return newOffset, errors.New("Cannot seek from end on incomplete upload")
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case os.SEEK_SET:
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newOffset = int64(offset)
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}
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hlu.offset = newOffset
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return hlu.offset, nil
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}
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func (hlu *httpLayerUpload) UUID() string {
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return hlu.uuid
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}
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func (hlu *httpLayerUpload) StartedAt() time.Time {
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return hlu.startedAt
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}
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func (hlu *httpLayerUpload) Finish(digest digest.Digest) (distribution.Layer, error) {
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// TODO(dmcgowan): Check if already finished, if so just fetch
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req, err := http.NewRequest("PUT", hlu.location, nil)
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if err != nil {
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return nil, err
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}
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values := req.URL.Query()
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values.Set("digest", digest.String())
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req.URL.RawQuery = values.Encode()
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resp, err := hlu.client.Do(req)
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if err != nil {
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return nil, err
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}
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switch {
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case resp.StatusCode == http.StatusCreated:
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return hlu.Layers().Fetch(digest)
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case resp.StatusCode == http.StatusNotFound:
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return nil, &BlobUploadNotFoundError{Location: hlu.location}
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case resp.StatusCode >= 400 && resp.StatusCode < 500:
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return nil, parseHTTPErrorResponse(resp)
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default:
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return nil, &UnexpectedHTTPStatusError{Status: resp.Status}
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}
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}
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func (hlu *httpLayerUpload) Cancel() error {
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panic("not implemented")
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}
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func (hlu *httpLayerUpload) Close() error {
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hlu.closed = true
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return nil
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}
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