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registry.go
261 lines (211 loc) · 5.41 KB
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registry.go
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package v1
import (
"bytes"
"crypto/tls"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"net"
"net/http"
"net/url"
"path"
"strings"
"time"
)
var (
ErrNotFound = errors.New("Not found")
defaultHTTPTimeout = 30 * time.Second
)
type RegistryClient struct {
URL *url.URL
tlsConfig *tls.Config
httpClient *http.Client
}
type Repo struct {
Namespace string
Repository string
}
func parseRepo(repo string) Repo {
namespace := "library"
r := repo
if strings.Index(repo, "/") != -1 {
parts := strings.Split(repo, "/")
namespace = parts[0]
r = path.Join(parts[1:]...)
}
return Repo{
Namespace: namespace,
Repository: r,
}
}
func newHTTPClient(u *url.URL, tlsConfig *tls.Config, timeout time.Duration) *http.Client {
httpTransport := &http.Transport{
TLSClientConfig: tlsConfig,
}
httpTransport.Dial = func(proto, addr string) (net.Conn, error) {
return net.DialTimeout(proto, addr, timeout)
}
return &http.Client{Transport: httpTransport}
}
func NewRegistryClient(registryUrl string, tlsConfig *tls.Config) (*RegistryClient, error) {
u, err := url.Parse(registryUrl)
if err != nil {
return nil, err
}
httpClient := newHTTPClient(u, tlsConfig, defaultHTTPTimeout)
return &RegistryClient{
URL: u,
httpClient: httpClient,
tlsConfig: tlsConfig,
}, nil
}
func (client *RegistryClient) doRequest(method string, path string, body []byte, headers map[string]string) ([]byte, error) {
b := bytes.NewBuffer(body)
req, err := http.NewRequest(method, client.URL.String()+"/v1"+path, b)
if err != nil {
return nil, err
}
req.Header.Add("Content-Type", "application/json")
if headers != nil {
for header, value := range headers {
req.Header.Add(header, value)
}
}
resp, err := client.httpClient.Do(req)
if err != nil {
if !strings.Contains(err.Error(), "connection refused") && client.tlsConfig == nil {
return nil, fmt.Errorf("%v. Are you trying to connect to a TLS-enabled daemon without TLS?", err)
}
return nil, err
}
defer resp.Body.Close()
data, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, err
}
if resp.StatusCode == 404 {
return nil, ErrNotFound
}
if resp.StatusCode >= 400 {
return nil, Error{StatusCode: resp.StatusCode, Status: resp.Status, msg: string(data)}
}
return data, nil
}
func (client *RegistryClient) Search(query string, page int, numResults int) (*SearchResult, error) {
if numResults < 1 {
numResults = 100
}
uri := fmt.Sprintf("/search?q=%s&n=%d&page=%d", query, numResults, page)
data, err := client.doRequest("GET", uri, nil, nil)
if err != nil {
return nil, err
}
res := &SearchResult{}
if err := json.Unmarshal(data, &res); err != nil {
return nil, err
}
// convert the simple results to rich Repository results
repos := []*Repository{}
for _, repo := range res.Results {
r, err := client.Repository(repo.Name)
if err != nil {
return nil, err
}
repos = append(repos, r)
}
res.Results = repos
return res, nil
}
func (client *RegistryClient) DeleteRepository(repo string) error {
r := parseRepo(repo)
uri := fmt.Sprintf("/repositories/%s/%s/", r.Namespace, r.Repository)
if _, err := client.doRequest("DELETE", uri, nil, nil); err != nil {
return err
}
return nil
}
func (client *RegistryClient) DeleteTag(repo string, tag string) error {
r := parseRepo(repo)
uri := fmt.Sprintf("/repositories/%s/%s/tags/%s", r.Namespace, r.Repository, tag)
if _, err := client.doRequest("DELETE", uri, nil, nil); err != nil {
return err
}
return nil
}
func (client *RegistryClient) Layer(id string) (*Layer, error) {
uri := fmt.Sprintf("/images/%s/json", id)
data, err := client.doRequest("GET", uri, nil, nil)
if err != nil {
return nil, err
}
layer := &Layer{}
if err := json.Unmarshal(data, &layer); err != nil {
return nil, err
}
return layer, nil
}
func (client *RegistryClient) Repository(name string) (*Repository, error) {
r := parseRepo(name)
uri := fmt.Sprintf("/repositories/%s/%s/tags", r.Namespace, r.Repository)
repoTags := map[string]string{}
data, err := client.doRequest("GET", uri, nil, nil)
if err != nil {
return nil, err
}
if err := json.Unmarshal(data, &repoTags); err != nil {
return nil, err
}
layers := []Layer{}
tags := []Tag{}
size := int64(0)
for n, id := range repoTags {
uri := fmt.Sprintf("/images/%s/json", id)
layer := &Layer{}
data, err := client.doRequest("GET", uri, nil, nil)
if err != nil {
return nil, err
}
if err := json.Unmarshal(data, &layer); err != nil {
return nil, err
}
uri = fmt.Sprintf("/images/%s/ancestry", id)
ancestry := []string{}
data, err = client.doRequest("GET", uri, nil, nil)
if err != nil {
return nil, err
}
if err = json.Unmarshal(data, &ancestry); err != nil {
return nil, err
}
tag := &Tag{
ID: id,
Name: n,
}
tags = append(tags, *tag)
layer.Ancestry = ancestry
layers = append(layers, *layer)
// parse ancestor layers
for _, i := range ancestry {
uri = fmt.Sprintf("/images/%s/json", i)
l := &Layer{}
data, err = client.doRequest("GET", uri, nil, nil)
if err != nil {
return nil, err
}
if err = json.Unmarshal(data, &l); err != nil {
return nil, err
}
size += l.Size
layers = append(layers, *l)
}
}
return &Repository{
Name: path.Join(r.Namespace, r.Repository),
Namespace: r.Namespace,
Repository: r.Repository,
Tags: tags,
Layers: layers,
Size: int64(size) / int64(len(tags)),
}, nil
}