160 lines
3.6 KiB
Go
160 lines
3.6 KiB
Go
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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"net/http"
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"os"
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"time"
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"github.com/docker/distribution"
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"github.com/docker/distribution/digest"
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)
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type httpLayerUpload struct {
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repo distribution.Repository
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client *http.Client
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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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func (hlu *httpLayerUpload) handleErrorResponse(resp *http.Response) error {
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if resp.StatusCode == http.StatusNotFound {
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return &BlobUploadNotFoundError{Location: hlu.location}
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}
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return handleErrorResponse(resp)
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}
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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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if resp.StatusCode != http.StatusAccepted {
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return 0, hlu.handleErrorResponse(resp)
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}
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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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}
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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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if resp.StatusCode != http.StatusAccepted {
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return 0, hlu.handleErrorResponse(resp)
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}
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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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}
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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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if resp.StatusCode != http.StatusCreated {
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return nil, hlu.handleErrorResponse(resp)
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}
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return hlu.repo.Layers().Fetch(digest)
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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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