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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,162 @@ | ||
| package crproxy | ||
|
|
||
| import ( | ||
| "context" | ||
| "crypto/sha256" | ||
| "encoding/hex" | ||
| "encoding/json" | ||
| "fmt" | ||
| "io" | ||
| "net/http" | ||
| "net/textproto" | ||
| "path" | ||
| "strconv" | ||
| "strings" | ||
|
|
||
| "github.com/distribution/distribution/v3/registry/api/errcode" | ||
| ) | ||
|
|
||
| func manifestRevisionsCachePath(host, image, tagOrBlob string) string { | ||
| return path.Join("/docker/registry/v2/repositories", host, image, "_manifests/revisions/sha256", tagOrBlob, "link") | ||
| } | ||
|
|
||
| func manifestTagCachePath(host, image, tagOrBlob string) string { | ||
| return path.Join("/docker/registry/v2/repositories", host, image, "_manifests/tags", tagOrBlob, "current/link") | ||
| } | ||
|
|
||
| func (c *CRProxy) cacheManifestResponse(rw http.ResponseWriter, r *http.Request, info *PathInfo) { | ||
| cli := c.getClientset(info.Host, info.Image) | ||
| resp, err := c.doWithAuth(cli, r, info.Host) | ||
| if err != nil { | ||
| if c.cachedManifest(rw, r, info) { | ||
| return | ||
| } | ||
| if c.logger != nil { | ||
| c.logger.Println("failed to request", info.Host, info.Image, err) | ||
| } | ||
| errcode.ServeJSON(rw, errcode.ErrorCodeUnknown) | ||
| return | ||
| } | ||
| defer func() { | ||
| resp.Body.Close() | ||
| }() | ||
|
|
||
| switch resp.StatusCode { | ||
| case http.StatusUnauthorized, http.StatusForbidden: | ||
| errcode.ServeJSON(rw, errcode.ErrorCodeDenied) | ||
| return | ||
| } | ||
|
|
||
| if resp.StatusCode >= http.StatusInternalServerError { | ||
| if c.cachedManifest(rw, r, info) { | ||
| return | ||
| } | ||
| } | ||
|
|
||
| resp.Header.Del("Docker-Ratelimit-Source") | ||
|
|
||
| header := rw.Header() | ||
| for k, v := range resp.Header { | ||
| key := textproto.CanonicalMIMEHeaderKey(k) | ||
| header[key] = v | ||
| } | ||
|
|
||
| if r.Method == http.MethodHead { | ||
| rw.WriteHeader(resp.StatusCode) | ||
| return | ||
| } | ||
|
|
||
| body, err := io.ReadAll(resp.Body) | ||
| if err != nil { | ||
| c.errorResponse(rw, r, err) | ||
| return | ||
| } | ||
| err = c.cacheManifestContent(context.Background(), info, body) | ||
| if err != nil { | ||
| c.errorResponse(rw, r, err) | ||
| return | ||
| } | ||
| rw.WriteHeader(resp.StatusCode) | ||
| rw.Write(body) | ||
| } | ||
|
|
||
| func (c *CRProxy) cacheManifestContent(ctx context.Context, info *PathInfo, content []byte) error { | ||
| h := sha256.New() | ||
| h.Write(content) | ||
| hash := hex.EncodeToString(h.Sum(nil)[:]) | ||
|
|
||
| if strings.HasPrefix(info.Manifests, "sha256:") { | ||
| if info.Manifests[7:] != hash { | ||
| return fmt.Errorf("expected hash %s is not same to %s, %s", info.Manifests[7:], hash) | ||
| } | ||
| } else { | ||
| manifestLinkPath := manifestTagCachePath(info.Host, info.Image, info.Manifests) | ||
| err := c.storageDriver.PutContent(ctx, manifestLinkPath, []byte("sha256:"+hash)) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
|
|
||
| manifestLinkPath := manifestRevisionsCachePath(info.Host, info.Image, hash) | ||
| err := c.storageDriver.PutContent(ctx, manifestLinkPath, []byte("sha256:"+hash)) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| blobCachePath := blobCachePath(hash) | ||
| err = c.storageDriver.PutContent(ctx, blobCachePath, content) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| func (c *CRProxy) cachedManifest(rw http.ResponseWriter, r *http.Request, info *PathInfo) bool { | ||
| ctx := r.Context() | ||
| var manifestLinkPath string | ||
| if strings.HasPrefix(info.Manifests, "sha256:") { | ||
| manifestLinkPath = manifestRevisionsCachePath(info.Host, info.Image, info.Manifests[7:]) | ||
| } else { | ||
| manifestLinkPath = manifestTagCachePath(info.Host, info.Image, info.Manifests) | ||
| } | ||
|
|
||
| content, err := c.storageDriver.GetContent(ctx, manifestLinkPath) | ||
| if err == nil { | ||
| digest := string(content) | ||
| blobCachePath := blobCachePath(digest) | ||
| content, err := c.storageDriver.GetContent(ctx, blobCachePath) | ||
| if err == nil { | ||
|
|
||
| mt := struct { | ||
| MediaType string `json:"mediaType"` | ||
| }{} | ||
| err := json.Unmarshal(content, &mt) | ||
| if err != nil { | ||
| if c.logger != nil { | ||
| c.logger.Println("Manifest blob cache err", blobCachePath, err) | ||
| } | ||
| return false | ||
| } | ||
| if c.logger != nil { | ||
| c.logger.Println("Manifest blob cache hit", blobCachePath) | ||
| } | ||
| rw.Header().Set("docker-content-digest", digest) | ||
| rw.Header().Set("Content-Type", mt.MediaType) | ||
| rw.Header().Set("Content-Length", strconv.FormatInt(int64(len(content)), 10)) | ||
| if r.Method != http.MethodHead { | ||
| rw.Write(content) | ||
| } | ||
| return true | ||
| } | ||
| if c.logger != nil { | ||
| c.logger.Println("Manifest blob cache missed", blobCachePath, err) | ||
| } | ||
| } else { | ||
| if c.logger != nil { | ||
| c.logger.Println("Manifest cache missed", manifestLinkPath, err) | ||
| } | ||
| } | ||
|
|
||
| return false | ||
| } |
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