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resume pulling the layer on disconnect

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Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
This commit is contained in:
unclejack 2014-03-26 02:33:17 +02:00
parent 3a21f339f1
commit 96412d40fd
2 changed files with 44 additions and 5 deletions
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45
docs/registry.go
View file

@ -256,12 +256,43 @@ func (r *Registry) GetRemoteImageJSON(imgID, registry string, token []string) ([
return jsonString, imageSize, nil
}
func (r *Registry) GetRemoteImageLayer(imgID, registry string, token []string) (io.ReadCloser, error) {
req, err := r.reqFactory.NewRequest("GET", registry+"images/"+imgID+"/layer", nil)
func (r *Registry) GetRemoteImageLayer(imgID, registry string, token []string, imgSize int64) (io.ReadCloser, error) {
var (
retries = 5
headRes *http.Response
hasResume bool = false
imageURL = fmt.Sprintf("%simages/%s/layer", registry, imgID)
)
headReq, err := r.reqFactory.NewRequest("HEAD", imageURL, nil)
if err != nil {
return nil, fmt.Errorf("Error while getting from the server: %s\n", err)
}
setTokenAuth(headReq, token)
for i := 1; i <= retries; i++ {
headRes, err = r.client.Do(headReq)
if err != nil && i == retries {
return nil, fmt.Errorf("Eror while making head request: %s\n", err)
} else if err != nil {
time.Sleep(time.Duration(i) * 5 * time.Second)
continue
}
break
}
if headRes.Header.Get("Accept-Ranges") == "bytes" && imgSize > 0 {
hasResume = true
}
req, err := r.reqFactory.NewRequest("GET", imageURL, nil)
if err != nil {
return nil, fmt.Errorf("Error while getting from the server: %s\n", err)
}
setTokenAuth(req, token)
if hasResume {
utils.Debugf("server supports resume")
return utils.ResumableRequestReader(r.client, req, 5, imgSize), nil
}
utils.Debugf("server doesn't support resume")
res, err := r.client.Do(req)
if err != nil {
return nil, err
@ -725,6 +756,13 @@ type Registry struct {
indexEndpoint string
}
func AddRequiredHeadersToRedirectedRequests(req *http.Request, via []*http.Request) error {
if via != nil && via[0] != nil {
req.Header = via[0].Header
}
return nil
}
func NewRegistry(authConfig *AuthConfig, factory *utils.HTTPRequestFactory, indexEndpoint string) (r *Registry, err error) {
httpDial := func(proto string, addr string) (net.Conn, error) {
conn, err := net.Dial(proto, addr)
@ -744,7 +782,8 @@ func NewRegistry(authConfig *AuthConfig, factory *utils.HTTPRequestFactory, inde
r = &Registry{
authConfig: authConfig,
client: &http.Client{
Transport: httpTransport,
Transport: httpTransport,
CheckRedirect: AddRequiredHeadersToRedirectedRequests,
},
indexEndpoint: indexEndpoint,
}

4
docs/registry_test.go
View file

@ -70,7 +70,7 @@ func TestGetRemoteImageJSON(t *testing.T) {
func TestGetRemoteImageLayer(t *testing.T) {
r := spawnTestRegistry(t)
data, err := r.GetRemoteImageLayer(IMAGE_ID, makeURL("/v1/"), TOKEN)
data, err := r.GetRemoteImageLayer(IMAGE_ID, makeURL("/v1/"), TOKEN, 0)
if err != nil {
t.Fatal(err)
}
@ -78,7 +78,7 @@ func TestGetRemoteImageLayer(t *testing.T) {
t.Fatal("Expected non-nil data result")
}
_, err = r.GetRemoteImageLayer("abcdef", makeURL("/v1/"), TOKEN)
_, err = r.GetRemoteImageLayer("abcdef", makeURL("/v1/"), TOKEN, 0)
if err == nil {
t.Fatal("Expected image not found error")
}