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registry: make certain headers optional 

For a pull-only, static registry, there only a couple of headers that
need to be optional (that are presently required.
* X-Docker-Registry-Version
* X-Docker-Size
* X-Docker-Endpoints

Docker-DCO-1.1-Signed-off-by: Vincent Batts <vbatts@redhat.com> (github: vbatts)
master
Vincent Batts 2014-03-10 16:11:03 -04:00
parent f6fefb0bc1
commit 471d923b1b
1 changed files with 38 additions and 15 deletions
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53
docs/registry.go
View File

@ -25,12 +25,8 @@ var (
errLoginRequired = errors.New("Authentication is required.")
)
func pingRegistryEndpoint(endpoint string) (bool, error) {
if endpoint == IndexServerAddress() {
// Skip the check, we now this one is valid
// (and we never want to fallback to http in case of error)
return false, nil
}
// reuse this chunk of code
func newClient() *http.Client {
httpDial := func(proto string, addr string) (net.Conn, error) {
// Set the connect timeout to 5 seconds
conn, err := net.DialTimeout(proto, addr, time.Duration(5)*time.Second)
@ -42,17 +38,39 @@ func pingRegistryEndpoint(endpoint string) (bool, error) {
return conn, nil
}
httpTransport := &http.Transport{Dial: httpDial}
client := &http.Client{Transport: httpTransport}
return &http.Client{Transport: httpTransport}
}
// Have an API to access the version of the registry
func getRegistryVersion(endpoint string) (string, error) {
client := newClient()
resp, err := client.Get(endpoint + "_version")
if err != nil {
return "", err
}
defer resp.Body.Close()
if hdr := resp.Header.Get("X-Docker-Registry-Version"); hdr != "" {
return hdr, nil
}
versionBody, err := ioutil.ReadAll(resp.Body)
return string(versionBody), err
}
func pingRegistryEndpoint(endpoint string) (bool, error) {
if endpoint == IndexServerAddress() {
// Skip the check, we now this one is valid
// (and we never want to fallback to http in case of error)
return false, nil
}
client := newClient()
resp, err := client.Get(endpoint + "_ping")
if err != nil {
return false, err
}
defer resp.Body.Close()
if resp.Header.Get("X-Docker-Registry-Version") == "" {
return false, errors.New("This does not look like a Registry server (\"X-Docker-Registry-Version\" header not found in the response)")
}
standalone := resp.Header.Get("X-Docker-Registry-Standalone")
utils.Debugf("Registry standalone header: '%s'", standalone)
// If the header is absent, we assume true for compatibility with earlier
@ -223,9 +241,13 @@ func (r *Registry) GetRemoteImageJSON(imgID, registry string, token []string) ([
return nil, -1, utils.NewHTTPRequestError(fmt.Sprintf("HTTP code %d", res.StatusCode), res)
}
imageSize, err := strconv.Atoi(res.Header.Get("X-Docker-Size"))
if err != nil {
return nil, -1, err
// if the size header is not present, then set it to '-1'
imageSize := -1
if hdr := res.Header.Get("X-Docker-Size"); hdr != "" {
imageSize, err = strconv.Atoi(hdr)
if err != nil {
return nil, -1, err
}
}
jsonString, err := ioutil.ReadAll(res.Body)
@ -336,7 +358,8 @@ func (r *Registry) GetRepositoryData(remote string) (*RepositoryData, error) {
endpoints = append(endpoints, fmt.Sprintf("%s://%s/v1/", urlScheme, ep))
}
} else {
return nil, fmt.Errorf("Index response didn't contain any endpoints")
// Assume the endpoint is on the same host
endpoints = append(endpoints, fmt.Sprintf("%s://%s/v1/", urlScheme, req.URL.Host))
}
checksumsJSON, err := ioutil.ReadAll(res.Body)